Update changelog for version 7.4.0

Optional Refresh Tokens

.styleci.yml

@@ -4,6 +4,7 @@ enabled:
   - binary_operator_spaces
   - blank_line_before_return
   - concat_with_spaces
+  - fully_qualified_strict_types
   - function_typehint_space
   - hash_to_slash_comment
   - include
@@ -29,7 +30,6 @@ enabled:
   - phpdoc_inline_tag
   - phpdoc_no_access
   - phpdoc_no_simplified_null_return
-  - phpdoc_order
   - phpdoc_property
   - phpdoc_scalar
   - phpdoc_separation
@@ -41,7 +41,6 @@ enabled:
   - print_to_echo
   - short_array_syntax
   - short_scalar_cast
-  - simplified_null_return
   - single_quote
   - spaces_cast
   - standardize_not_equal

.travis.yml

@@ -15,13 +15,14 @@ php:
   - 7.0
   - 7.1
   - 7.2
+  - 7.3
 
 install:
   - composer update --no-interaction --prefer-dist $DEPENDENCIES
 
 script:
   - vendor/bin/phpunit --coverage-clover=coverage.clover
-  - vendor/bin/phpstan analyse -l 6 -c phpstan.neon src tests
+  - vendor/bin/phpstan analyse -l 7 -c phpstan.neon src tests
 
 after_script:
     - wget https://scrutinizer-ci.com/ocular.phar

CHANGELOG.md

@@ -6,7 +6,77 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
-## [7.0.0] - released 2018-02-17
+## [7.4.0] - released 2019-05-05
+
+### Changed
+- RefreshTokenRepository can now return null, allowing refresh tokens to be optional. (PR #649)
+
+## [7.3.3] - released 2019-03-29
+
+### Added
+- Added `error_description` to the error payload to improve standards compliance. The contents of this are copied from the existing `message` value. (PR #1006)
+
+### Deprecated
+- Error payload will not issue `message` value in the next major release (PR #1006)
+
+## [7.3.2] - released 2018-11-21
+
+### Fixed
+- Revert setting keys on response type to be inside `getResponseType()` function instead of AuthorizationServer constructor (PR #969)
+
+## [7.3.1] - released 2018-11-15
+
+### Fixed
+- Fix issue with previous release where interface had changed for the AuthorizationServer. Reverted to the previous interface while maintaining functionality changes (PR #970)
+
+## [7.3.0] - released 2018-11-13
+
+### Changed
+- Moved  the `finalizeScopes()` call from `validateAuthorizationRequest` method to the `completeAuthorizationRequest` method so it is called just before the access token is issued (PR #923)
+
+### Added
+- Added a ScopeTrait to provide an implementation for jsonSerialize (PR #952)
+- Ability to nest exceptions (PR #965)
+
+### Fixed
+- Fix issue where AuthorizationServer is not stateless as ResponseType could store state of a previous request (PR #960)
+
+## [7.2.0] - released 2018-06-23
+
+### Changed
+- Added new`validateRedirectUri` method AbstractGrant to remove three instances of code duplication (PR #912)
+- Allow 640 as a crypt key file permission (PR #917)
+
+### Added
+- Function `hasRedirect()` added to `OAuthServerException` (PR #703)
+
+### Fixed
+- Catch and handle `BadMethodCallException` from the `verify()` method of the JWT token in the `validateAuthorization` method (PR #904)
+
+## [4.1.7] - released 2018-06-23
+
+### Fixed
+- Ensure `empty()` function call only contains variable to be compatible with PHP 5.4 (PR #918)
+
+## [7.1.1] - released 2018-05-21
+
+### Fixed
+- No longer set a WWW-Authenticate header for invalid clients if the client did not send an Authorization header in the original request (PR #902)
+
+## [7.1.0] - released 2018-04-22
+
+### Changed
+- Changed hint for unsupportedGrantType exception so it no longer references the grant type parameter which isn't always expected (PR #893)
+- Upgrade PHPStan checks to level 7 (PR #856)
+
+### Added
+- Added event emitters for issued access and refresh tokens (PR #860)
+- Can now use Defuse\Crypto\Key for encryption/decryption of keys which is faster than the Cryto class (PR #812)
+
+### Removed
+- Remove paragone/random_compat from dependencies
+
+## [7.0.0] - released 2018-02-18
 
 ### Added
 - Use PHPStan for static analysis of code (PR #848)
@@ -79,6 +149,10 @@ To address feedback from the security release the following change has been made
 
 - Fixed `finalizeScopes` call (Issue #650)
 
+## [4.1.6] - 2016-09-13
+
+- Less restrictive on Authorization header check (Issue #652)
+
 ## [5.1.1] - 2016-07-26
 
 - Improved test suite (Issue #614)
@@ -371,7 +445,15 @@ Version 5 is a complete code rewrite.
 
 - First major release
 
-[Unreleased]: https://github.com/thephpleague/oauth2-server/compare/7.0.0...HEAD
+[Unreleased]: https://github.com/thephpleague/oauth2-server/compare/7.4.0...HEAD
+[7.4.0]: https://github.com/thephpleague/oauth2-server/compare/7.3.3...7.4.0
+[7.3.3]: https://github.com/thephpleague/oauth2-server/compare/7.3.2...7.3.3
+[7.3.2]: https://github.com/thephpleague/oauth2-server/compare/7.3.1...7.3.2
+[7.3.1]: https://github.com/thephpleague/oauth2-server/compare/7.3.0...7.3.1
+[7.3.0]: https://github.com/thephpleague/oauth2-server/compare/7.2.0...7.3.0
+[7.2.0]: https://github.com/thephpleague/oauth2-server/compare/7.1.1...7.2.0
+[7.1.1]: https://github.com/thephpleague/oauth2-server/compare/7.1.0...7.1.1
+[7.1.0]: https://github.com/thephpleague/oauth2-server/compare/7.0.0...7.1.0
 [7.0.0]: https://github.com/thephpleague/oauth2-server/compare/6.1.1...7.0.0
 [6.1.1]: https://github.com/thephpleague/oauth2-server/compare/6.0.0...6.1.1
 [6.1.0]: https://github.com/thephpleague/oauth2-server/compare/6.0.2...6.1.0
@@ -389,6 +471,8 @@ Version 5 is a complete code rewrite.
 [5.0.0]: https://github.com/thephpleague/oauth2-server/compare/5.0.0-RC2...5.0.0
 [5.0.0-RC2]: https://github.com/thephpleague/oauth2-server/compare/5.0.0-RC1...5.0.0-RC2
 [5.0.0-RC1]: https://github.com/thephpleague/oauth2-server/compare/4.1.5...5.0.0-RC1
+[4.1.7]: https://github.com/thephpleague/oauth2-server/compare/4.1.6...4.1.7
+[4.1.6]: https://github.com/thephpleague/oauth2-server/compare/4.1.5...4.1.6
 [4.1.5]: https://github.com/thephpleague/oauth2-server/compare/4.1.4...4.1.5
 [4.1.4]: https://github.com/thephpleague/oauth2-server/compare/4.1.3...4.1.4
 [4.1.3]: https://github.com/thephpleague/oauth2-server/compare/4.1.2...4.1.3

CODE_OF_CONDUCT.md

@@ -0,0 +1,73 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of experience,
+education, socio-economic status, nationality, personal appearance, race,
+religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at andrew@noexceptions.io. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org

CONDUCT.md

@@ -1,22 +0,0 @@
-# Contributor Code of Conduct
-
-As contributors and maintainers of this project, and in the interest of fostering an open and welcoming community, we pledge to respect all people who contribute through reporting issues, posting feature requests, updating documentation, submitting pull requests or patches, and other activities.
-
-We are committed to making participation in this project a harassment-free experience for everyone, regardless of level of experience, gender, gender identity and expression, sexual orientation, disability, personal appearance, body size, race, ethnicity, age, religion, or nationality.
-
-Examples of unacceptable behavior by participants include:
-
-* The use of sexualized language or imagery
-* Personal attacks
-* Trolling or insulting/derogatory comments
-* Public or private harassment
-* Publishing other's private information, such as physical or electronic addresses, without explicit permission
-* Other unethical or unprofessional conduct.
-
-Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct. By adopting this Code of Conduct, project maintainers commit themselves to fairly and consistently applying these principles to every aspect of managing this project. Project maintainers who do not follow or enforce the Code of Conduct may be permanently removed from the project team.
-
-This code of conduct applies both within project spaces and in public spaces when an individual is representing the project or its community in a direct capacity. Personal views, beliefs and values of individuals do not necessarily reflect those of the organisation or affiliated individuals and organisations.
-
-Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by opening an issue or contacting one or more of the project maintainers.
-
-This Code of Conduct is adapted from the [Contributor Covenant](http://contributor-covenant.org), version 1.2.0, available at [http://contributor-covenant.org/version/1/2/0/](http://contributor-covenant.org/version/1/2/0/)

README.md

@@ -34,9 +34,12 @@ The following versions of PHP are supported:
 * PHP 7.0
 * PHP 7.1
 * PHP 7.2
+* PHP 7.3
 
 The `openssl` extension is also required.
 
+All HTTP messages passed to the server should be [PSR-7 compliant](https://www.php-fig.org/psr/psr-7/). This ensures interoperability with other packages and frameworks.
+
 ## Installation
 
 ```
@@ -54,7 +57,7 @@ The library uses [PHPUnit](https://phpunit.de/) for unit tests and [PHPStan](htt
 
 ```
 vendor/bin/phpunit
-vendor/bin/phpstan analyse -l 6 -c phpstan.neon src tests
+vendor/bin/phpstan analyse -l 7 -c phpstan.neon src tests
 ```
 
 ## Continous Integration
@@ -63,8 +66,11 @@ We use [Travis CI](https://travis-ci.org/), [Scrutinizer](https://scrutinizer-ci
 
 ## Community Integrations
 
+* [Drupal](https://www.drupal.org/project/simple_oauth)
 * [Laravel Passport](https://github.com/laravel/passport)
 * [OAuth 2 Server for CakePHP 3](https://github.com/uafrica/oauth-server)
+* [OAuth 2 Server for Expressive](https://github.com/zendframework/zend-expressive-authentication-oauth2)
+* [Trikoder OAuth 2 Bundle (Symfony)](https://github.com/trikoder/oauth2-bundle)
 
 ## Changelog
 
@@ -72,7 +78,7 @@ See the [project changelog](https://github.com/thephpleague/oauth2-server/blob/m
 
 ## Contributing
 
-Contributions are always welcome. Please see [CONTRIBUTING.md](https://github.com/thephpleague/oauth2-server/blob/master/CONTRIBUTING.md) and [CONDUCT.md](https://github.com/thephpleague/oauth2-server/blob/master/CONDUCT.md) for details.
+Contributions are always welcome. Please see [CONTRIBUTING.md](https://github.com/thephpleague/oauth2-server/blob/master/CONTRIBUTING.md) and [CODE_OF_CONDUCT.md](https://github.com/thephpleague/oauth2-server/blob/master/CODE_OF_CONDUCT.md) for details.
 
 ## Support
 

composer.json

@@ -8,7 +8,6 @@
         "ext-openssl": "*",
         "league/event": "^2.1",
         "lcobucci/jwt": "^3.2.2",
-        "paragonie/random_compat": "^2.0",
         "psr/http-message": "^1.0.1",
         "defuse/php-encryption": "^2.1"
     },
@@ -17,7 +16,8 @@
         "zendframework/zend-diactoros": "^1.3.2",
         "phpstan/phpstan": "^0.9.2",
         "phpstan/phpstan-phpunit": "^0.9.4",
-        "phpstan/phpstan-strict-rules": "^0.9.0"
+        "phpstan/phpstan-strict-rules": "^0.9.0",
+        "roave/security-advisories": "dev-master"
     },
     "repositories": [
         {
@@ -47,6 +47,12 @@
             "email": "hello@alexbilbie.com",
             "homepage": "http://www.alexbilbie.com",
             "role": "Developer"
+        },
+        {
+            "name": "Andy Millington",
+            "email": "andrew@noexceptions.io",
+            "homepage": "https://www.noexceptions.io",
+            "role": "Developer"
         }
     ],
     "replace": {

examples/composer.json

@@ -1,14 +1,13 @@
 {
     "require": {
-        "slim/slim": "3.0.*"
+        "slim/slim": "^3.0.0"
     },
     "require-dev": {
         "league/event": "^2.1",
-        "lcobucci/jwt": "^3.1",
-        "paragonie/random_compat": "^2.0",
+        "lcobucci/jwt": "^3.2",
         "psr/http-message": "^1.0",
-        "defuse/php-encryption": "^2.1",
-        "zendframework/zend-diactoros": "^1.0"
+        "defuse/php-encryption": "^2.2",
+        "zendframework/zend-diactoros": "^2.0.0"
     },
     "autoload": {
         "psr-4": {

examples/composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "9813ed7c3b6dcf107f44df9392935b8f",
+    "content-hash": "97f2878428e37d1d8e5418cc85cbfa3d",
     "packages": [
         {
             "name": "container-interop/container-interop",
@@ -39,21 +39,24 @@
         },
         {
             "name": "nikic/fast-route",
-            "version": "v0.6.0",
+            "version": "v1.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/FastRoute.git",
-                "reference": "31fa86924556b80735f98b294a7ffdfb26789f22"
+                "reference": "181d480e08d9476e61381e04a71b34dc0432e812"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/FastRoute/zipball/31fa86924556b80735f98b294a7ffdfb26789f22",
-                "reference": "31fa86924556b80735f98b294a7ffdfb26789f22",
+                "url": "https://api.github.com/repos/nikic/FastRoute/zipball/181d480e08d9476e61381e04a71b34dc0432e812",
+                "reference": "181d480e08d9476e61381e04a71b34dc0432e812",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.4.0"
             },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.35|~5.7"
+            },
             "type": "library",
             "autoload": {
                 "psr-4": {
@@ -78,29 +81,33 @@
                 "router",
                 "routing"
             ],
-            "time": "2015-06-18T19:15:47+00:00"
+            "time": "2018-02-13T20:26:39+00:00"
         },
         {
             "name": "pimple/pimple",
-            "version": "v3.0.2",
+            "version": "v3.2.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/silexphp/Pimple.git",
-                "reference": "a30f7d6e57565a2e1a316e1baf2a483f788b258a"
+                "reference": "9e403941ef9d65d20cba7d54e29fe906db42cf32"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/silexphp/Pimple/zipball/a30f7d6e57565a2e1a316e1baf2a483f788b258a",
-                "reference": "a30f7d6e57565a2e1a316e1baf2a483f788b258a",
+                "url": "https://api.github.com/repos/silexphp/Pimple/zipball/9e403941ef9d65d20cba7d54e29fe906db42cf32",
+                "reference": "9e403941ef9d65d20cba7d54e29fe906db42cf32",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.0"
+                "php": ">=5.3.0",
+                "psr/container": "^1.0"
+            },
+            "require-dev": {
+                "symfony/phpunit-bridge": "^3.2"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.0.x-dev"
+                    "dev-master": "3.2.x-dev"
                 }
             },
             "autoload": {
@@ -124,7 +131,7 @@
                 "container",
                 "dependency injection"
             ],
-            "time": "2015-09-11T15:10:35+00:00"
+            "time": "2018-01-21T07:42:36+00:00"
         },
         {
             "name": "psr/container",
@@ -227,27 +234,32 @@
         },
         {
             "name": "slim/slim",
-            "version": "3.0.0",
+            "version": "3.11.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/slimphp/Slim.git",
-                "reference": "3b06f0f2d84dabbe81b6cea46ace46a3e883253e"
+                "reference": "d378e70431e78ee92ee32ddde61ecc72edf5dc0a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/slimphp/Slim/zipball/3b06f0f2d84dabbe81b6cea46ace46a3e883253e",
-                "reference": "3b06f0f2d84dabbe81b6cea46ace46a3e883253e",
+                "url": "https://api.github.com/repos/slimphp/Slim/zipball/d378e70431e78ee92ee32ddde61ecc72edf5dc0a",
+                "reference": "d378e70431e78ee92ee32ddde61ecc72edf5dc0a",
                 "shasum": ""
             },
             "require": {
-                "container-interop/container-interop": "^1.1",
-                "nikic/fast-route": "^0.6",
+                "container-interop/container-interop": "^1.2",
+                "nikic/fast-route": "^1.0",
                 "php": ">=5.5.0",
                 "pimple/pimple": "^3.0",
+                "psr/container": "^1.0",
                 "psr/http-message": "^1.0"
             },
+            "provide": {
+                "psr/http-message-implementation": "1.0"
+            },
             "require-dev": {
-                "phpunit/phpunit": "^4.0"
+                "phpunit/phpunit": "^4.0",
+                "squizlabs/php_codesniffer": "^2.5"
             },
             "type": "library",
             "autoload": {
@@ -282,38 +294,38 @@
                 }
             ],
             "description": "Slim is a PHP micro framework that helps you quickly write simple yet powerful web applications and APIs",
-            "homepage": "http://slimframework.com",
+            "homepage": "https://slimframework.com",
             "keywords": [
                 "api",
                 "framework",
                 "micro",
                 "router"
             ],
-            "time": "2015-12-07T14:11:09+00:00"
+            "time": "2018-09-16T10:54:21+00:00"
         }
     ],
     "packages-dev": [
         {
             "name": "defuse/php-encryption",
-            "version": "v2.1.0",
+            "version": "v2.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/defuse/php-encryption.git",
-                "reference": "5176f5abb38d3ea8a6e3ac6cd3bbb54d8185a689"
+                "reference": "0f407c43b953d571421e0020ba92082ed5fb7620"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/defuse/php-encryption/zipball/5176f5abb38d3ea8a6e3ac6cd3bbb54d8185a689",
-                "reference": "5176f5abb38d3ea8a6e3ac6cd3bbb54d8185a689",
+                "url": "https://api.github.com/repos/defuse/php-encryption/zipball/0f407c43b953d571421e0020ba92082ed5fb7620",
+                "reference": "0f407c43b953d571421e0020ba92082ed5fb7620",
                 "shasum": ""
             },
             "require": {
                 "ext-openssl": "*",
-                "paragonie/random_compat": "~2.0",
+                "paragonie/random_compat": ">= 2",
                 "php": ">=5.4.0"
             },
             "require-dev": {
-                "nikic/php-parser": "^2.0|^3.0",
+                "nikic/php-parser": "^2.0|^3.0|^4.0",
                 "phpunit/phpunit": "^4|^5"
             },
             "bin": [
@@ -354,20 +366,20 @@
                 "security",
                 "symmetric key cryptography"
             ],
-            "time": "2017-05-18T21:28:48+00:00"
+            "time": "2018-07-24T23:27:56+00:00"
         },
         {
             "name": "lcobucci/jwt",
-            "version": "3.2.1",
+            "version": "3.2.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/lcobucci/jwt.git",
-                "reference": "ddce703826f9c5229781933b1a39069e38e6a0f3"
+                "reference": "c9704b751315d21735dc98d78d4f37bd73596da7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/lcobucci/jwt/zipball/ddce703826f9c5229781933b1a39069e38e6a0f3",
-                "reference": "ddce703826f9c5229781933b1a39069e38e6a0f3",
+                "url": "https://api.github.com/repos/lcobucci/jwt/zipball/c9704b751315d21735dc98d78d4f37bd73596da7",
+                "reference": "c9704b751315d21735dc98d78d4f37bd73596da7",
                 "shasum": ""
             },
             "require": {
@@ -412,7 +424,7 @@
                 "JWS",
                 "jwt"
             ],
-            "time": "2016-10-31T20:09:32+00:00"
+            "time": "2018-08-03T11:23:50+00:00"
         },
         {
             "name": "league/event",
@@ -466,33 +478,29 @@
         },
         {
             "name": "paragonie/random_compat",
-            "version": "v2.0.10",
+            "version": "v9.99.99",
             "source": {
                 "type": "git",
                 "url": "https://github.com/paragonie/random_compat.git",
-                "reference": "634bae8e911eefa89c1abfbf1b66da679ac8f54d"
+                "reference": "84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/paragonie/random_compat/zipball/634bae8e911eefa89c1abfbf1b66da679ac8f54d",
-                "reference": "634bae8e911eefa89c1abfbf1b66da679ac8f54d",
+                "url": "https://api.github.com/repos/paragonie/random_compat/zipball/84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95",
+                "reference": "84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.2.0"
+                "php": "^7"
             },
             "require-dev": {
-                "phpunit/phpunit": "4.*|5.*"
+                "phpunit/phpunit": "4.*|5.*",
+                "vimeo/psalm": "^1"
             },
             "suggest": {
                 "ext-libsodium": "Provides a modern crypto API that can be used to generate random bytes."
             },
             "type": "library",
-            "autoload": {
-                "files": [
-                    "lib/random.php"
-                ]
-            },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
                 "MIT"
@@ -507,10 +515,129 @@
             "description": "PHP 5.x polyfill for random_bytes() and random_int() from PHP 7",
             "keywords": [
                 "csprng",
+                "polyfill",
                 "pseudorandom",
                 "random"
             ],
-            "time": "2017-03-13T16:27:32+00:00"
+            "time": "2018-07-02T15:55:56+00:00"
+        },
+        {
+            "name": "psr/http-factory",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/http-factory.git",
+                "reference": "378bfe27931ecc54ff824a20d6f6bfc303bbd04c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/http-factory/zipball/378bfe27931ecc54ff824a20d6f6bfc303bbd04c",
+                "reference": "378bfe27931ecc54ff824a20d6f6bfc303bbd04c",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0.0",
+                "psr/http-message": "^1.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Http\\Message\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interfaces for PSR-7 HTTP message factories",
+            "keywords": [
+                "factory",
+                "http",
+                "message",
+                "psr",
+                "psr-17",
+                "psr-7",
+                "request",
+                "response"
+            ],
+            "time": "2018-07-30T21:54:04+00:00"
+        },
+        {
+            "name": "zendframework/zend-diactoros",
+            "version": "2.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/zendframework/zend-diactoros.git",
+                "reference": "0bae78192e634774b5584f0210c1232da82cb1ff"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/zendframework/zend-diactoros/zipball/0bae78192e634774b5584f0210c1232da82cb1ff",
+                "reference": "0bae78192e634774b5584f0210c1232da82cb1ff",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1",
+                "psr/http-factory": "^1.0",
+                "psr/http-message": "^1.0"
+            },
+            "provide": {
+                "psr/http-factory-implementation": "1.0",
+                "psr/http-message-implementation": "1.0"
+            },
+            "require-dev": {
+                "ext-dom": "*",
+                "ext-libxml": "*",
+                "http-interop/http-factory-tests": "^0.5.0",
+                "php-http/psr7-integration-tests": "dev-master",
+                "phpunit/phpunit": "^7.0.2",
+                "zendframework/zend-coding-standard": "~1.0.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev",
+                    "dev-develop": "2.1.x-dev",
+                    "dev-release-1.8": "1.8.x-dev"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "src/functions/create_uploaded_file.php",
+                    "src/functions/marshal_headers_from_sapi.php",
+                    "src/functions/marshal_method_from_sapi.php",
+                    "src/functions/marshal_protocol_version_from_sapi.php",
+                    "src/functions/marshal_uri_from_sapi.php",
+                    "src/functions/normalize_server.php",
+                    "src/functions/normalize_uploaded_files.php",
+                    "src/functions/parse_cookie_header.php"
+                ],
+                "psr-4": {
+                    "Zend\\Diactoros\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "description": "PSR HTTP Message implementations",
+            "keywords": [
+                "http",
+                "psr",
+                "psr-7"
+            ],
+            "time": "2018-09-27T19:49:04+00:00"
         }
     ],
     "aliases": [],

examples/src/Entities/ScopeEntity.php

@@ -11,13 +11,9 @@ namespace OAuth2ServerExamples\Entities;
 
 use League\OAuth2\Server\Entities\ScopeEntityInterface;
 use League\OAuth2\Server\Entities\Traits\EntityTrait;
+use League\OAuth2\Server\Entities\Traits\ScopeTrait;
 
 class ScopeEntity implements ScopeEntityInterface
 {
-    use EntityTrait;
-
-    public function jsonSerialize()
-    {
-        return $this->getIdentifier();
-    }
+    use EntityTrait, ScopeTrait;
 }

examples/src/Repositories/ClientRepository.php

@@ -17,7 +17,7 @@ class ClientRepository implements ClientRepositoryInterface
     /**
      * {@inheritdoc}
      */
-    public function getClientEntity($clientIdentifier, $grantType, $clientSecret = null, $mustValidateSecret = true)
+    public function getClientEntity($clientIdentifier, $grantType = null, $clientSecret = null, $mustValidateSecret = true)
     {
         $clients = [
             'myawesomeapp' => [

examples/src/Repositories/RefreshTokenRepository.php

@@ -18,7 +18,7 @@ class RefreshTokenRepository implements RefreshTokenRepositoryInterface
     /**
      * {@inheritdoc}
      */
-    public function persistNewRefreshToken(RefreshTokenEntityInterface $refreshTokenEntityInterface)
+    public function persistNewRefreshToken(RefreshTokenEntityInterface $refreshTokenEntity)
     {
         // Some logic to persist the refresh token in a database
     }

phpstan.neon

@@ -3,3 +3,8 @@ includes:
 	- vendor/phpstan/phpstan-phpunit/rules.neon
 	- vendor/phpstan/phpstan-phpunit/strictRules.neon
 	- vendor/phpstan/phpstan-strict-rules/rules.neon
+services:
+	-
+		class: LeagueTests\PHPStan\AbstractGrantExtension
+		tags:
+			- phpstan.broker.dynamicMethodReturnTypeExtension

src/AuthorizationServer.php

@@ -9,6 +9,8 @@
 
 namespace League\OAuth2\Server;
 
+use DateInterval;
+use Defuse\Crypto\Key;
 use League\Event\EmitterAwareInterface;
 use League\Event\EmitterAwareTrait;
 use League\OAuth2\Server\Exception\OAuthServerException;
@@ -33,7 +35,7 @@ class AuthorizationServer implements EmitterAwareInterface
     protected $enabledGrantTypes = [];
 
     /**
-     * @var \DateInterval[]
+     * @var DateInterval[]
      */
     protected $grantTypeAccessTokenTTL = [];
 
@@ -48,7 +50,7 @@ class AuthorizationServer implements EmitterAwareInterface
     protected $publicKey;
 
     /**
-     * @var null|ResponseTypeInterface
+     * @var ResponseTypeInterface
      */
     protected $responseType;
 
@@ -68,7 +70,7 @@ class AuthorizationServer implements EmitterAwareInterface
     private $scopeRepository;
 
     /**
-     * @var string
+     * @var string|Key
      */
     private $encryptionKey;
 
@@ -84,7 +86,7 @@ class AuthorizationServer implements EmitterAwareInterface
      * @param AccessTokenRepositoryInterface $accessTokenRepository
      * @param ScopeRepositoryInterface       $scopeRepository
      * @param CryptKey|string                $privateKey
-     * @param string                         $encryptionKey
+     * @param string|Key                     $encryptionKey
      * @param null|ResponseTypeInterface     $responseType
      */
     public function __construct(
@@ -102,8 +104,16 @@ class AuthorizationServer implements EmitterAwareInterface
         if ($privateKey instanceof CryptKey === false) {
             $privateKey = new CryptKey($privateKey);
         }
+
         $this->privateKey = $privateKey;
         $this->encryptionKey = $encryptionKey;
+
+        if ($responseType === null) {
+            $responseType = new BearerTokenResponse();
+        } else {
+            $responseType = clone $responseType;
+        }
+
         $this->responseType = $responseType;
     }
 
@@ -111,12 +121,12 @@ class AuthorizationServer implements EmitterAwareInterface
      * Enable a grant type on the server.
      *
      * @param GrantTypeInterface $grantType
-     * @param null|\DateInterval $accessTokenTTL
+     * @param null|DateInterval  $accessTokenTTL
      */
-    public function enableGrantType(GrantTypeInterface $grantType, \DateInterval $accessTokenTTL = null)
+    public function enableGrantType(GrantTypeInterface $grantType, DateInterval $accessTokenTTL = null)
     {
-        if ($accessTokenTTL instanceof \DateInterval === false) {
-            $accessTokenTTL = new \DateInterval('PT1H');
+        if ($accessTokenTTL instanceof DateInterval === false) {
+            $accessTokenTTL = new DateInterval('PT1H');
         }
 
         $grantType->setAccessTokenRepository($this->accessTokenRepository);
@@ -203,16 +213,15 @@ class AuthorizationServer implements EmitterAwareInterface
      */
     protected function getResponseType()
     {
-        if ($this->responseType instanceof ResponseTypeInterface === false) {
-            $this->responseType = new BearerTokenResponse();
+        $responseType = clone $this->responseType;
+
+        if ($responseType instanceof AbstractResponseType) {
+            $responseType->setPrivateKey($this->privateKey);
         }
 
-        if ($this->responseType instanceof AbstractResponseType === true) {
-            $this->responseType->setPrivateKey($this->privateKey);
-        }
-        $this->responseType->setEncryptionKey($this->encryptionKey);
+        $responseType->setEncryptionKey($this->encryptionKey);
 
-        return $this->responseType;
+        return $responseType;
     }
 
     /**

src/AuthorizationValidators/BearerTokenValidator.php

@@ -9,6 +9,8 @@
 
 namespace League\OAuth2\Server\AuthorizationValidators;
 
+use BadMethodCallException;
+use InvalidArgumentException;
 use Lcobucci\JWT\Parser;
 use Lcobucci\JWT\Signer\Rsa\Sha256;
 use Lcobucci\JWT\ValidationData;
@@ -17,6 +19,7 @@ use League\OAuth2\Server\CryptTrait;
 use League\OAuth2\Server\Exception\OAuthServerException;
 use League\OAuth2\Server\Repositories\AccessTokenRepositoryInterface;
 use Psr\Http\Message\ServerRequestInterface;
+use RuntimeException;
 
 class BearerTokenValidator implements AuthorizationValidatorInterface
 {
@@ -28,7 +31,7 @@ class BearerTokenValidator implements AuthorizationValidatorInterface
     private $accessTokenRepository;
 
     /**
-     * @var \League\OAuth2\Server\CryptKey
+     * @var CryptKey
      */
     protected $publicKey;
 
@@ -43,7 +46,7 @@ class BearerTokenValidator implements AuthorizationValidatorInterface
     /**
      * Set the public key
      *
-     * @param \League\OAuth2\Server\CryptKey $key
+     * @param CryptKey $key
      */
     public function setPublicKey(CryptKey $key)
     {
@@ -65,8 +68,12 @@ class BearerTokenValidator implements AuthorizationValidatorInterface
         try {
             // Attempt to parse and validate the JWT
             $token = (new Parser())->parse($jwt);
-            if ($token->verify(new Sha256(), $this->publicKey->getKeyPath()) === false) {
-                throw OAuthServerException::accessDenied('Access token could not be verified');
+            try {
+                if ($token->verify(new Sha256(), $this->publicKey->getKeyPath()) === false) {
+                    throw OAuthServerException::accessDenied('Access token could not be verified');
+                }
+            } catch (BadMethodCallException $exception) {
+                throw OAuthServerException::accessDenied('Access token is not signed', null, $exception);
             }
 
             // Ensure access token hasn't expired
@@ -88,12 +95,12 @@ class BearerTokenValidator implements AuthorizationValidatorInterface
                 ->withAttribute('oauth_client_id', $token->getClaim('aud'))
                 ->withAttribute('oauth_user_id', $token->getClaim('sub'))
                 ->withAttribute('oauth_scopes', $token->getClaim('scopes'));
-        } catch (\InvalidArgumentException $exception) {
+        } catch (InvalidArgumentException $exception) {
             // JWT couldn't be parsed so return the request as is
-            throw OAuthServerException::accessDenied($exception->getMessage());
-        } catch (\RuntimeException $exception) {
+            throw OAuthServerException::accessDenied($exception->getMessage(), null, $exception);
+        } catch (RuntimeException $exception) {
             //JWR couldn't be parsed so return the request as is
-            throw OAuthServerException::accessDenied('Error while decoding to JSON');
+            throw OAuthServerException::accessDenied('Error while decoding to JSON', null, $exception);
         }
     }
 }

src/CryptKey.php

@@ -11,6 +11,9 @@
 
 namespace League\OAuth2\Server;
 
+use LogicException;
+use RuntimeException;
+
 class CryptKey
 {
     const RSA_KEY_PATTERN =
@@ -42,13 +45,13 @@ class CryptKey
         }
 
         if (!file_exists($keyPath) || !is_readable($keyPath)) {
-            throw new \LogicException(sprintf('Key path "%s" does not exist or is not readable', $keyPath));
+            throw new LogicException(sprintf('Key path "%s" does not exist or is not readable', $keyPath));
         }
 
         if ($keyPermissionsCheck === true) {
             // Verify the permissions of the key
             $keyPathPerms = decoct(fileperms($keyPath) & 0777);
-            if (in_array($keyPathPerms, ['400', '440', '600', '660'], true) === false) {
+            if (in_array($keyPathPerms, ['400', '440', '600', '640', '660'], true) === false) {
                 trigger_error(sprintf(
                     'Key file "%s" permissions are not correct, recommend changing to 600 or 660 instead of %s',
                     $keyPath,
@@ -64,7 +67,7 @@ class CryptKey
     /**
      * @param string $key
      *
-     * @throws \RuntimeException
+     * @throws RuntimeException
      *
      * @return string
      */
@@ -79,19 +82,19 @@ class CryptKey
 
         if (!touch($keyPath)) {
             // @codeCoverageIgnoreStart
-            throw new \RuntimeException(sprintf('"%s" key file could not be created', $keyPath));
+            throw new RuntimeException(sprintf('"%s" key file could not be created', $keyPath));
             // @codeCoverageIgnoreEnd
         }
 
         if (file_put_contents($keyPath, $key) === false) {
             // @codeCoverageIgnoreStart
-            throw new \RuntimeException(sprintf('Unable to write key file to temporary directory "%s"', $tmpDir));
+            throw new RuntimeException(sprintf('Unable to write key file to temporary directory "%s"', $tmpDir));
             // @codeCoverageIgnoreEnd
         }
 
         if (chmod($keyPath, 0600) === false) {
             // @codeCoverageIgnoreStart
-            throw new \RuntimeException(sprintf('The key file "%s" file mode could not be changed with chmod to 600', $keyPath));
+            throw new RuntimeException(sprintf('The key file "%s" file mode could not be changed with chmod to 600', $keyPath));
             // @codeCoverageIgnoreEnd
         }
 

src/CryptTrait.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Public/private key encryption.
+ * Encrypt/decrypt with encryptionKey.
  *
  * @author      Alex Bilbie <hello@alexbilbie.com>
  * @copyright   Copyright (c) Alex Bilbie
@@ -12,54 +12,65 @@
 namespace League\OAuth2\Server;
 
 use Defuse\Crypto\Crypto;
+use Defuse\Crypto\Key;
+use Exception;
+use LogicException;
 
 trait CryptTrait
 {
     /**
-     * @var string
+     * @var string|Key
      */
     protected $encryptionKey;
 
     /**
-     * Encrypt data with a private key.
+     * Encrypt data with encryptionKey.
      *
      * @param string $unencryptedData
      *
-     * @throws \LogicException
+     * @throws LogicException
      *
      * @return string
      */
     protected function encrypt($unencryptedData)
     {
         try {
+            if ($this->encryptionKey instanceof Key) {
+                return Crypto::encrypt($unencryptedData, $this->encryptionKey);
+            }
+
             return Crypto::encryptWithPassword($unencryptedData, $this->encryptionKey);
-        } catch (\Exception $e) {
-            throw new \LogicException($e->getMessage());
+        } catch (Exception $e) {
+            throw new LogicException($e->getMessage(), null, $e);
         }
     }
 
     /**
-     * Decrypt data with a public key.
+     * Decrypt data with encryptionKey.
      *
      * @param string $encryptedData
      *
-     * @throws \LogicException
+     * @throws LogicException
      *
      * @return string
      */
     protected function decrypt($encryptedData)
     {
         try {
+            if ($this->encryptionKey instanceof Key) {
+                return Crypto::decrypt($encryptedData, $this->encryptionKey);
+            }
+
             return Crypto::decryptWithPassword($encryptedData, $this->encryptionKey);
-        } catch (\Exception $e) {
-            throw new \LogicException($e->getMessage());
+        } catch (Exception $e) {
+            throw new LogicException($e->getMessage(), null, $e);
         }
     }
 
     /**
      * Set the encryption key
      *
-     * @param string $key
+     * @param string|Key $key
      */
     public function setEncryptionKey($key = null)
     {

src/Entities/AuthCodeEntityInterface.php

@@ -12,7 +12,7 @@ namespace League\OAuth2\Server\Entities;
 interface AuthCodeEntityInterface extends TokenInterface
 {
     /**
-     * @return string
+     * @return string|null
      */
     public function getRedirectUri();
 

src/Entities/RefreshTokenEntityInterface.php

@@ -9,6 +9,8 @@
 
 namespace League\OAuth2\Server\Entities;
 
+use DateTime;
+
 interface RefreshTokenEntityInterface
 {
     /**
@@ -28,16 +30,16 @@ interface RefreshTokenEntityInterface
     /**
      * Get the token's expiry date time.
      *
-     * @return \DateTime
+     * @return DateTime
      */
     public function getExpiryDateTime();
 
     /**
      * Set the date time when the token expires.
      *
-     * @param \DateTime $dateTime
+     * @param DateTime $dateTime
      */
-    public function setExpiryDateTime(\DateTime $dateTime);
+    public function setExpiryDateTime(DateTime $dateTime);
 
     /**
      * Set the access token that the refresh token was associated with.

src/Entities/ScopeEntityInterface.php

@@ -9,7 +9,9 @@
 
 namespace League\OAuth2\Server\Entities;
 
-interface ScopeEntityInterface extends \JsonSerializable
+use JsonSerializable;
+
+interface ScopeEntityInterface extends JsonSerializable
 {
     /**
      * Get the scope's identifier.

src/Entities/TokenInterface.php

@@ -9,6 +9,8 @@
 
 namespace League\OAuth2\Server\Entities;
 
+use DateTime;
+
 interface TokenInterface
 {
     /**
@@ -28,16 +30,16 @@ interface TokenInterface
     /**
      * Get the token's expiry date time.
      *
-     * @return \DateTime
+     * @return DateTime
      */
     public function getExpiryDateTime();
 
     /**
      * Set the date time when the token expires.
      *
-     * @param \DateTime $dateTime
+     * @param DateTime $dateTime
      */
-    public function setExpiryDateTime(\DateTime $dateTime);
+    public function setExpiryDateTime(DateTime $dateTime);
 
     /**
      * Set the identifier of the user associated with the token.

src/Entities/Traits/AccessTokenTrait.php

@@ -9,6 +9,7 @@
 
 namespace League\OAuth2\Server\Entities\Traits;
 
+use DateTime;
 use Lcobucci\JWT\Builder;
 use Lcobucci\JWT\Signer\Key;
 use Lcobucci\JWT\Signer\Rsa\Sha256;
@@ -46,7 +47,7 @@ trait AccessTokenTrait
     abstract public function getClient();
 
     /**
-     * @return \DateTime
+     * @return DateTime
      */
     abstract public function getExpiryDateTime();
 

src/Entities/Traits/AuthCodeTrait.php

@@ -17,7 +17,7 @@ trait AuthCodeTrait
     protected $redirectUri;
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getRedirectUri()
     {

src/Entities/Traits/RefreshTokenTrait.php

@@ -9,6 +9,7 @@
 
 namespace League\OAuth2\Server\Entities\Traits;
 
+use DateTime;
 use League\OAuth2\Server\Entities\AccessTokenEntityInterface;
 
 trait RefreshTokenTrait
@@ -19,7 +20,7 @@ trait RefreshTokenTrait
     protected $accessToken;
 
     /**
-     * @var \DateTime
+     * @var DateTime
      */
     protected $expiryDateTime;
 
@@ -42,7 +43,7 @@ trait RefreshTokenTrait
     /**
      * Get the token's expiry date time.
      *
-     * @return \DateTime
+     * @return DateTime
      */
     public function getExpiryDateTime()
     {
@@ -52,9 +53,9 @@ trait RefreshTokenTrait
     /**
      * Set the date time when the token expires.
      *
-     * @param \DateTime $dateTime
+     * @param DateTime $dateTime
      */
-    public function setExpiryDateTime(\DateTime $dateTime)
+    public function setExpiryDateTime(DateTime $dateTime)
     {
         $this->expiryDateTime = $dateTime;
     }

src/Entities/Traits/ScopeTrait.php

@@ -0,0 +1,28 @@
+<?php
+/**
+ * @author    Andrew Millington <andrew@noexceptions.io>
+ * @copyright Copyright (c) Andrew Millington
+ * @license   http://mit-license.org
+ *
+ * @link      https://github.com/thephpleague/oauth2-server
+ */
+
+namespace League\OAuth2\Server\Entities\Traits;
+
+trait ScopeTrait
+{
+    /**
+     * Serialize the object to the scopes string identifier when using json_encode().
+     *
+     * @return string
+     */
+    public function jsonSerialize()
+    {
+        return $this->getIdentifier();
+    }
+
+    /**
+     * @return string
+     */
+    abstract public function getIdentifier();
+}

src/Entities/Traits/TokenEntityTrait.php

@@ -9,6 +9,7 @@
 
 namespace League\OAuth2\Server\Entities\Traits;
 
+use DateTime;
 use League\OAuth2\Server\Entities\ClientEntityInterface;
 use League\OAuth2\Server\Entities\ScopeEntityInterface;
 
@@ -20,7 +21,7 @@ trait TokenEntityTrait
     protected $scopes = [];
 
     /**
-     * @var \DateTime
+     * @var DateTime
      */
     protected $expiryDateTime;
 
@@ -57,7 +58,7 @@ trait TokenEntityTrait
     /**
      * Get the token's expiry date time.
      *
-     * @return \DateTime
+     * @return DateTime
      */
     public function getExpiryDateTime()
     {
@@ -67,9 +68,9 @@ trait TokenEntityTrait
     /**
      * Set the date time when the token expires.
      *
-     * @param \DateTime $dateTime
+     * @param DateTime $dateTime
      */
-    public function setExpiryDateTime(\DateTime $dateTime)
+    public function setExpiryDateTime(DateTime $dateTime)
     {
         $this->expiryDateTime = $dateTime;
     }

src/Exception/OAuthServerException.php

@@ -9,9 +9,11 @@
 
 namespace League\OAuth2\Server\Exception;
 
+use Exception;
 use Psr\Http\Message\ResponseInterface;
+use Throwable;
 
-class OAuthServerException extends \Exception
+class OAuthServerException extends Exception
 {
     /**
      * @var int
@@ -47,17 +49,18 @@ class OAuthServerException extends \Exception
      * @param int         $httpStatusCode HTTP status code to send (default = 400)
      * @param null|string $hint           A helper hint
      * @param null|string $redirectUri    A HTTP URI to redirect the user back to
+     * @param Throwable   $previous       Previous exception
      */
-    public function __construct($message, $code, $errorType, $httpStatusCode = 400, $hint = null, $redirectUri = null)
+    public function __construct($message, $code, $errorType, $httpStatusCode = 400, $hint = null, $redirectUri = null, Throwable $previous = null)
     {
-        parent::__construct($message, $code);
+        parent::__construct($message, $code, $previous);
         $this->httpStatusCode = $httpStatusCode;
         $this->errorType = $errorType;
         $this->hint = $hint;
         $this->redirectUri = $redirectUri;
         $this->payload = [
-            'error'   => $errorType,
-            'message' => $message,
+            'error'             => $errorType,
+            'error_description' => $message,
         ];
         if ($hint !== null) {
             $this->payload['hint'] = $hint;
@@ -71,7 +74,15 @@ class OAuthServerException extends \Exception
      */
     public function getPayload()
     {
-        return $this->payload;
+        $payload = $this->payload;
+
+        // The "message" property is deprecated and replaced by "error_description"
+        // TODO: remove "message" property
+        if (isset($payload['error_description']) && !isset($payload['message'])) {
+            $payload['message'] = $payload['error_description'];
+        }
+
+        return $payload;
     }
 
     /**
@@ -92,7 +103,7 @@ class OAuthServerException extends \Exception
     public static function unsupportedGrantType()
     {
         $errorMessage = 'The authorization grant type is not supported by the authorization server.';
-        $hint = 'Check the `grant_type` parameter';
+        $hint = 'Check that all required parameters have been provided';
 
         return new static($errorMessage, 2, 'unsupported_grant_type', 400, $hint);
     }
@@ -102,16 +113,17 @@ class OAuthServerException extends \Exception
      *
      * @param string      $parameter The invalid parameter
      * @param null|string $hint
+     * @param Throwable   $previous  Previous exception
      *
      * @return static
      */
-    public static function invalidRequest($parameter, $hint = null)
+    public static function invalidRequest($parameter, $hint = null, Throwable $previous = null)
     {
         $errorMessage = 'The request is missing a required parameter, includes an invalid parameter value, ' .
             'includes a parameter more than once, or is otherwise malformed.';
         $hint = ($hint === null) ? sprintf('Check the `%s` parameter', $parameter) : $hint;
 
-        return new static($errorMessage, 3, 'invalid_request', 400, $hint);
+        return new static($errorMessage, 3, 'invalid_request', 400, $hint, null, $previous);
     }
 
     /**
@@ -163,20 +175,24 @@ class OAuthServerException extends \Exception
     /**
      * Server error.
      *
-     * @param string $hint
+     * @param string    $hint
+     * @param Throwable $previous
      *
      * @return static
      *
      * @codeCoverageIgnore
      */
-    public static function serverError($hint)
+    public static function serverError($hint, Throwable $previous = null)
     {
         return new static(
             'The authorization server encountered an unexpected condition which prevented it from fulfilling'
             . ' the request: ' . $hint,
             7,
             'server_error',
-            500
+            500,
+            null,
+            null,
+            $previous
         );
     }
 
@@ -184,12 +200,13 @@ class OAuthServerException extends \Exception
      * Invalid refresh token.
      *
      * @param null|string $hint
+     * @param Throwable   $previous
      *
      * @return static
      */
-    public static function invalidRefreshToken($hint = null)
+    public static function invalidRefreshToken($hint = null, Throwable $previous = null)
     {
-        return new static('The refresh token is invalid.', 8, 'invalid_request', 401, $hint);
+        return new static('The refresh token is invalid.', 8, 'invalid_request', 401, $hint, null, $previous);
     }
 
     /**
@@ -197,10 +214,11 @@ class OAuthServerException extends \Exception
      *
      * @param null|string $hint
      * @param null|string $redirectUri
+     * @param Throwable   $previous
      *
      * @return static
      */
-    public static function accessDenied($hint = null, $redirectUri = null)
+    public static function accessDenied($hint = null, $redirectUri = null, Throwable $previous = null)
     {
         return new static(
             'The resource owner or authorization server denied the request.',
@@ -208,7 +226,8 @@ class OAuthServerException extends \Exception
             'access_denied',
             401,
             $hint,
-            $redirectUri
+            $redirectUri,
+            $previous
         );
     }
 
@@ -294,19 +313,30 @@ class OAuthServerException extends \Exception
         // include the "WWW-Authenticate" response header field
         // matching the authentication scheme used by the client.
         // @codeCoverageIgnoreStart
-        if ($this->errorType === 'invalid_client') {
-            $authScheme = 'Basic';
-            if (array_key_exists('HTTP_AUTHORIZATION', $_SERVER) !== false
-                && strpos($_SERVER['HTTP_AUTHORIZATION'], 'Bearer') === 0
-            ) {
-                $authScheme = 'Bearer';
-            }
+        if ($this->errorType === 'invalid_client' && array_key_exists('HTTP_AUTHORIZATION', $_SERVER) !== false) {
+            $authScheme = strpos($_SERVER['HTTP_AUTHORIZATION'], 'Bearer') === 0 ? 'Bearer' : 'Basic';
+
             $headers['WWW-Authenticate'] = $authScheme . ' realm="OAuth"';
         }
         // @codeCoverageIgnoreEnd
         return $headers;
     }
 
+    /**
+     * Check if the exception has an associated redirect URI.
+     *
+     * Returns whether the exception includes a redirect, since
+     * getHttpStatusCode() doesn't return a 302 when there's a
+     * redirect enabled. This helps when you want to override local
+     * error pages but want to let redirects through.
+     *
+     * @return bool
+     */
+    public function hasRedirect()
+    {
+        return $this->redirectUri !== null;
+    }
+
     /**
      * Returns the HTTP status code to send when the exceptions is output.
      *

src/Exception/UniqueTokenIdentifierConstraintViolationException.php

@@ -11,6 +11,9 @@ namespace League\OAuth2\Server\Exception;
 
 class UniqueTokenIdentifierConstraintViolationException extends OAuthServerException
 {
+    /**
+     * @return UniqueTokenIdentifierConstraintViolationException
+     */
     public static function create()
     {
         $errorMessage = 'Could not create unique access token identifier';

src/Grant/AbstractGrant.php

@@ -10,6 +10,10 @@
  */
 namespace League\OAuth2\Server\Grant;
 
+use DateInterval;
+use DateTime;
+use Error;
+use Exception;
 use League\Event\EmitterAwareTrait;
 use League\OAuth2\Server\CryptKey;
 use League\OAuth2\Server\CryptTrait;
@@ -28,7 +32,9 @@ use League\OAuth2\Server\Repositories\ScopeRepositoryInterface;
 use League\OAuth2\Server\Repositories\UserRepositoryInterface;
 use League\OAuth2\Server\RequestEvent;
 use League\OAuth2\Server\RequestTypes\AuthorizationRequest;
+use LogicException;
 use Psr\Http\Message\ServerRequestInterface;
+use TypeError;
 
 /**
  * Abstract grant class.
@@ -72,12 +78,12 @@ abstract class AbstractGrant implements GrantTypeInterface
     protected $userRepository;
 
     /**
-     * @var \DateInterval
+     * @var DateInterval
      */
     protected $refreshTokenTTL;
 
     /**
-     * @var \League\OAuth2\Server\CryptKey
+     * @var CryptKey
      */
     protected $privateKey;
 
@@ -137,7 +143,7 @@ abstract class AbstractGrant implements GrantTypeInterface
     /**
      * {@inheritdoc}
      */
-    public function setRefreshTokenTTL(\DateInterval $refreshTokenTTL)
+    public function setRefreshTokenTTL(DateInterval $refreshTokenTTL)
     {
         $this->refreshTokenTTL = $refreshTokenTTL;
     }
@@ -145,7 +151,7 @@ abstract class AbstractGrant implements GrantTypeInterface
     /**
      * Set the private key
      *
-     * @param \League\OAuth2\Server\CryptKey $key
+     * @param CryptKey $key
      */
     public function setPrivateKey(CryptKey $key)
     {
@@ -174,7 +180,7 @@ abstract class AbstractGrant implements GrantTypeInterface
         list($basicAuthUser, $basicAuthPassword) = $this->getBasicAuthCredentials($request);
 
         $clientId = $this->getRequestParameter('client_id', $request, $basicAuthUser);
-        if (is_null($clientId)) {
+        if ($clientId === null) {
             throw OAuthServerException::invalidRequest('client_id');
         }
 
@@ -193,32 +199,48 @@ abstract class AbstractGrant implements GrantTypeInterface
             throw OAuthServerException::invalidClient();
         }
 
-        // If a redirect URI is provided ensure it matches what is pre-registered
         $redirectUri = $this->getRequestParameter('redirect_uri', $request, null);
+
         if ($redirectUri !== null) {
-            if (
-                is_string($client->getRedirectUri())
-                && (strcmp($client->getRedirectUri(), $redirectUri) !== 0)
-            ) {
-                $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
-                throw OAuthServerException::invalidClient();
-            } elseif (
-                is_array($client->getRedirectUri())
-                && in_array($redirectUri, $client->getRedirectUri(), true) === false
-            ) {
-                $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
-                throw OAuthServerException::invalidClient();
-            }
+            $this->validateRedirectUri($redirectUri, $client, $request);
         }
 
         return $client;
     }
 
+    /**
+     * Validate redirectUri from the request.
+     * If a redirect URI is provided ensure it matches what is pre-registered
+     *
+     * @param string                 $redirectUri
+     * @param ClientEntityInterface  $client
+     * @param ServerRequestInterface $request
+     *
+     * @throws OAuthServerException
+     */
+    protected function validateRedirectUri(
+        string $redirectUri,
+        ClientEntityInterface $client,
+        ServerRequestInterface $request
+    ) {
+        if (\is_string($client->getRedirectUri())
+            && (strcmp($client->getRedirectUri(), $redirectUri) !== 0)
+        ) {
+            $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
+            throw OAuthServerException::invalidClient();
+        } elseif (\is_array($client->getRedirectUri())
+            && \in_array($redirectUri, $client->getRedirectUri(), true) === false
+        ) {
+            $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
+            throw OAuthServerException::invalidClient();
+        }
+    }
+
     /**
      * Validate scopes in the request.
      *
-     * @param string $scopes
-     * @param string $redirectUri
+     * @param string|array $scopes
+     * @param string       $redirectUri
      *
      * @throws OAuthServerException
      *
@@ -226,13 +248,13 @@ abstract class AbstractGrant implements GrantTypeInterface
      */
     public function validateScopes($scopes, $redirectUri = null)
     {
-        $scopesList = array_filter(explode(self::SCOPE_DELIMITER_STRING, trim($scopes)), function ($scope) {
-            return !empty($scope);
-        });
+        if (!\is_array($scopes)) {
+            $scopes = $this->convertScopesQueryStringToArray($scopes);
+        }
 
         $validScopes = [];
 
-        foreach ($scopesList as $scopeItem) {
+        foreach ($scopes as $scopeItem) {
             $scope = $this->scopeRepository->getScopeEntityByIdentifier($scopeItem);
 
             if ($scope instanceof ScopeEntityInterface === false) {
@@ -245,6 +267,20 @@ abstract class AbstractGrant implements GrantTypeInterface
         return $validScopes;
     }
 
+    /**
+     * Converts a scopes query string to an array to easily iterate for validation.
+     *
+     * @param string $scopes
+     *
+     * @return array
+     */
+    private function convertScopesQueryStringToArray($scopes)
+    {
+        return array_filter(explode(self::SCOPE_DELIMITER_STRING, trim($scopes)), function ($scope) {
+            return !empty($scope);
+        });
+    }
+
     /**
      * Retrieve request parameter.
      *
@@ -258,7 +294,7 @@ abstract class AbstractGrant implements GrantTypeInterface
     {
         $requestParameters = (array) $request->getParsedBody();
 
-        return isset($requestParameters[$parameter]) ? $requestParameters[$parameter] : $default;
+        return $requestParameters[$parameter] ?? $default;
     }
 
     /**
@@ -339,7 +375,7 @@ abstract class AbstractGrant implements GrantTypeInterface
     /**
      * Issue an access token.
      *
-     * @param \DateInterval          $accessTokenTTL
+     * @param DateInterval           $accessTokenTTL
      * @param ClientEntityInterface  $client
      * @param string|null            $userIdentifier
      * @param ScopeEntityInterface[] $scopes
@@ -350,7 +386,7 @@ abstract class AbstractGrant implements GrantTypeInterface
      * @return AccessTokenEntityInterface
      */
     protected function issueAccessToken(
-        \DateInterval $accessTokenTTL,
+        DateInterval $accessTokenTTL,
         ClientEntityInterface $client,
         $userIdentifier,
         array $scopes = []
@@ -360,7 +396,7 @@ abstract class AbstractGrant implements GrantTypeInterface
         $accessToken = $this->accessTokenRepository->getNewToken($client, $scopes, $userIdentifier);
         $accessToken->setClient($client);
         $accessToken->setUserIdentifier($userIdentifier);
-        $accessToken->setExpiryDateTime((new \DateTime())->add($accessTokenTTL));
+        $accessToken->setExpiryDateTime((new DateTime())->add($accessTokenTTL));
 
         foreach ($scopes as $scope) {
             $accessToken->addScope($scope);
@@ -383,10 +419,10 @@ abstract class AbstractGrant implements GrantTypeInterface
     /**
      * Issue an auth code.
      *
-     * @param \DateInterval          $authCodeTTL
+     * @param DateInterval           $authCodeTTL
      * @param ClientEntityInterface  $client
      * @param string                 $userIdentifier
-     * @param string                 $redirectUri
+     * @param string|null            $redirectUri
      * @param ScopeEntityInterface[] $scopes
      *
      * @throws OAuthServerException
@@ -395,7 +431,7 @@ abstract class AbstractGrant implements GrantTypeInterface
      * @return AuthCodeEntityInterface
      */
     protected function issueAuthCode(
-        \DateInterval $authCodeTTL,
+        DateInterval $authCodeTTL,
         ClientEntityInterface $client,
         $userIdentifier,
         $redirectUri,
@@ -404,10 +440,13 @@ abstract class AbstractGrant implements GrantTypeInterface
         $maxGenerationAttempts = self::MAX_RANDOM_TOKEN_GENERATION_ATTEMPTS;
 
         $authCode = $this->authCodeRepository->getNewAuthCode();
-        $authCode->setExpiryDateTime((new \DateTime())->add($authCodeTTL));
+        $authCode->setExpiryDateTime((new DateTime())->add($authCodeTTL));
         $authCode->setClient($client);
         $authCode->setUserIdentifier($userIdentifier);
-        $authCode->setRedirectUri($redirectUri);
+
+        if ($redirectUri !== null) {
+            $authCode->setRedirectUri($redirectUri);
+        }
 
         foreach ($scopes as $scope) {
             $authCode->addScope($scope);
@@ -433,16 +472,21 @@ abstract class AbstractGrant implements GrantTypeInterface
      * @throws OAuthServerException
      * @throws UniqueTokenIdentifierConstraintViolationException
      *
-     * @return RefreshTokenEntityInterface
+     * @return RefreshTokenEntityInterface|null
      */
     protected function issueRefreshToken(AccessTokenEntityInterface $accessToken)
     {
-        $maxGenerationAttempts = self::MAX_RANDOM_TOKEN_GENERATION_ATTEMPTS;
-
         $refreshToken = $this->refreshTokenRepository->getNewRefreshToken();
-        $refreshToken->setExpiryDateTime((new \DateTime())->add($this->refreshTokenTTL));
+
+        if ($refreshToken === null) {
+            return null;
+        }
+
+        $refreshToken->setExpiryDateTime((new DateTime())->add($this->refreshTokenTTL));
         $refreshToken->setAccessToken($accessToken);
 
+        $maxGenerationAttempts = self::MAX_RANDOM_TOKEN_GENERATION_ATTEMPTS;
+
         while ($maxGenerationAttempts-- > 0) {
             $refreshToken->setIdentifier($this->generateUniqueIdentifier());
             try {
@@ -471,13 +515,13 @@ abstract class AbstractGrant implements GrantTypeInterface
         try {
             return bin2hex(random_bytes($length));
             // @codeCoverageIgnoreStart
-        } catch (\TypeError $e) {
-            throw OAuthServerException::serverError('An unexpected error has occurred');
-        } catch (\Error $e) {
-            throw OAuthServerException::serverError('An unexpected error has occurred');
-        } catch (\Exception $e) {
+        } catch (TypeError $e) {
+            throw OAuthServerException::serverError('An unexpected error has occurred', $e);
+        } catch (Error $e) {
+            throw OAuthServerException::serverError('An unexpected error has occurred', $e);
+        } catch (Exception $e) {
             // If you get this message, the CSPRNG failed hard.
-            throw OAuthServerException::serverError('Could not generate a random string');
+            throw OAuthServerException::serverError('Could not generate a random string', $e);
         }
         // @codeCoverageIgnoreEnd
     }
@@ -508,7 +552,7 @@ abstract class AbstractGrant implements GrantTypeInterface
      */
     public function validateAuthorizationRequest(ServerRequestInterface $request)
     {
-        throw new \LogicException('This grant cannot validate an authorization request');
+        throw new LogicException('This grant cannot validate an authorization request');
     }
 
     /**
@@ -516,6 +560,6 @@ abstract class AbstractGrant implements GrantTypeInterface
      */
     public function completeAuthorizationRequest(AuthorizationRequest $authorizationRequest)
     {
-        throw new \LogicException('This grant cannot complete an authorization request');
+        throw new LogicException('This grant cannot complete an authorization request');
     }
 }

src/Grant/AuthCodeGrant.php

@@ -9,8 +9,10 @@
 
 namespace League\OAuth2\Server\Grant;
 
+use DateInterval;
+use DateTime;
+use Exception;
 use League\OAuth2\Server\Entities\ClientEntityInterface;
-use League\OAuth2\Server\Entities\ScopeEntityInterface;
 use League\OAuth2\Server\Entities\UserEntityInterface;
 use League\OAuth2\Server\Exception\OAuthServerException;
 use League\OAuth2\Server\Repositories\AuthCodeRepositoryInterface;
@@ -19,12 +21,14 @@ use League\OAuth2\Server\RequestEvent;
 use League\OAuth2\Server\RequestTypes\AuthorizationRequest;
 use League\OAuth2\Server\ResponseTypes\RedirectResponse;
 use League\OAuth2\Server\ResponseTypes\ResponseTypeInterface;
+use LogicException;
 use Psr\Http\Message\ServerRequestInterface;
+use stdClass;
 
 class AuthCodeGrant extends AbstractAuthorizeGrant
 {
     /**
-     * @var \DateInterval
+     * @var DateInterval
      */
     private $authCodeTTL;
 
@@ -36,17 +40,19 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
     /**
      * @param AuthCodeRepositoryInterface     $authCodeRepository
      * @param RefreshTokenRepositoryInterface $refreshTokenRepository
-     * @param \DateInterval                   $authCodeTTL
+     * @param DateInterval                    $authCodeTTL
+     *
+     * @throws Exception
      */
     public function __construct(
         AuthCodeRepositoryInterface $authCodeRepository,
         RefreshTokenRepositoryInterface $refreshTokenRepository,
-        \DateInterval $authCodeTTL
+        DateInterval $authCodeTTL
     ) {
         $this->setAuthCodeRepository($authCodeRepository);
         $this->setRefreshTokenRepository($refreshTokenRepository);
         $this->authCodeTTL = $authCodeTTL;
-        $this->refreshTokenTTL = new \DateInterval('P1M');
+        $this->refreshTokenTTL = new DateInterval('P1M');
     }
 
     public function enableCodeExchangeProof()
@@ -59,7 +65,7 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
      *
      * @param ServerRequestInterface $request
      * @param ResponseTypeInterface  $responseType
-     * @param \DateInterval          $accessTokenTTL
+     * @param DateInterval           $accessTokenTTL
      *
      * @throws OAuthServerException
      *
@@ -68,7 +74,7 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
     public function respondToAccessTokenRequest(
         ServerRequestInterface $request,
         ResponseTypeInterface $responseType,
-        \DateInterval $accessTokenTTL
+        DateInterval $accessTokenTTL
     ) {
         // Validate request
         $client = $this->validateClient($request);
@@ -78,58 +84,25 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
             throw OAuthServerException::invalidRequest('code');
         }
 
-        // Validate the authorization code
         try {
             $authCodePayload = json_decode($this->decrypt($encryptedAuthCode));
-            if (time() > $authCodePayload->expire_time) {
-                throw OAuthServerException::invalidRequest('code', 'Authorization code has expired');
-            }
 
-            if ($this->authCodeRepository->isAuthCodeRevoked($authCodePayload->auth_code_id) === true) {
-                throw OAuthServerException::invalidRequest('code', 'Authorization code has been revoked');
-            }
+            $this->validateAuthorizationCode($authCodePayload, $client, $request);
 
-            if ($authCodePayload->client_id !== $client->getIdentifier()) {
-                throw OAuthServerException::invalidRequest('code', 'Authorization code was not issued to this client');
-            }
-
-            // The redirect URI is required in this request
-            $redirectUri = $this->getRequestParameter('redirect_uri', $request, null);
-            if (empty($authCodePayload->redirect_uri) === false && $redirectUri === null) {
-                throw OAuthServerException::invalidRequest('redirect_uri');
-            }
-
-            if ($authCodePayload->redirect_uri !== $redirectUri) {
-                throw OAuthServerException::invalidRequest('redirect_uri', 'Invalid redirect URI');
-            }
-
-            $scopes = [];
-            foreach ($authCodePayload->scopes as $scopeId) {
-                $scope = $this->scopeRepository->getScopeEntityByIdentifier($scopeId);
-
-                if ($scope instanceof ScopeEntityInterface === false) {
-                    // @codeCoverageIgnoreStart
-                    throw OAuthServerException::invalidScope($scopeId);
-                    // @codeCoverageIgnoreEnd
-                }
-
-                $scopes[] = $scope;
-            }
-
-            // Finalize the requested scopes
             $scopes = $this->scopeRepository->finalizeScopes(
-                $scopes,
+                $this->validateScopes($authCodePayload->scopes),
                 $this->getIdentifier(),
                 $client,
                 $authCodePayload->user_id
             );
-        } catch (\LogicException  $e) {
-            throw OAuthServerException::invalidRequest('code', 'Cannot decrypt the authorization code');
+        } catch (LogicException $e) {
+            throw OAuthServerException::invalidRequest('code', 'Cannot decrypt the authorization code', $e);
         }
 
         // Validate code challenge
         if ($this->enableCodeExchangeProof === true) {
             $codeVerifier = $this->getRequestParameter('code_verifier', $request, null);
+
             if ($codeVerifier === null) {
                 throw OAuthServerException::invalidRequest('code_verifier');
             }
@@ -172,13 +145,18 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
             }
         }
 
-        // Issue and persist access + refresh tokens
+        // Issue and persist new access token
         $accessToken = $this->issueAccessToken($accessTokenTTL, $client, $authCodePayload->user_id, $scopes);
+        $this->getEmitter()->emit(new RequestEvent(RequestEvent::ACCESS_TOKEN_ISSUED, $request));
+        $responseType->setAccessToken($accessToken);
+
+        // Issue and persist new refresh token if given
         $refreshToken = $this->issueRefreshToken($accessToken);
 
-        // Inject tokens into response type
-        $responseType->setAccessToken($accessToken);
-        $responseType->setRefreshToken($refreshToken);
+        if ($refreshToken !== null) {
+            $this->getEmitter()->emit(new RequestEvent(RequestEvent::REFRESH_TOKEN_ISSUED, $request));
+            $responseType->setRefreshToken($refreshToken);
+        }
 
         // Revoke used auth code
         $this->authCodeRepository->revokeAuthCode($authCodePayload->auth_code_id);
@@ -186,6 +164,41 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
         return $responseType;
     }
 
+    /**
+     * Validate the authorization code.
+     *
+     * @param stdClass               $authCodePayload
+     * @param ClientEntityInterface  $client
+     * @param ServerRequestInterface $request
+     */
+    private function validateAuthorizationCode(
+        $authCodePayload,
+        ClientEntityInterface $client,
+        ServerRequestInterface $request
+    ) {
+        if (time() > $authCodePayload->expire_time) {
+            throw OAuthServerException::invalidRequest('code', 'Authorization code has expired');
+        }
+
+        if ($this->authCodeRepository->isAuthCodeRevoked($authCodePayload->auth_code_id) === true) {
+            throw OAuthServerException::invalidRequest('code', 'Authorization code has been revoked');
+        }
+
+        if ($authCodePayload->client_id !== $client->getIdentifier()) {
+            throw OAuthServerException::invalidRequest('code', 'Authorization code was not issued to this client');
+        }
+
+        // The redirect URI is required in this request
+        $redirectUri = $this->getRequestParameter('redirect_uri', $request, null);
+        if (empty($authCodePayload->redirect_uri) === false && $redirectUri === null) {
+            throw OAuthServerException::invalidRequest('redirect_uri');
+        }
+
+        if ($authCodePayload->redirect_uri !== $redirectUri) {
+            throw OAuthServerException::invalidRequest('redirect_uri', 'Invalid redirect URI');
+        }
+    }
+
     /**
      * Return the grant identifier that can be used in matching up requests.
      *
@@ -218,7 +231,8 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
             $request,
             $this->getServerParameter('PHP_AUTH_USER', $request)
         );
-        if (is_null($clientId)) {
+
+        if ($clientId === null) {
             throw OAuthServerException::invalidRequest('client_id');
         }
 
@@ -235,26 +249,15 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
         }
 
         $redirectUri = $this->getQueryStringParameter('redirect_uri', $request);
+
         if ($redirectUri !== null) {
-            if (
-                is_string($client->getRedirectUri())
-                && (strcmp($client->getRedirectUri(), $redirectUri) !== 0)
-            ) {
-                $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
-                throw OAuthServerException::invalidClient();
-            } elseif (
-                is_array($client->getRedirectUri())
-                && in_array($redirectUri, $client->getRedirectUri(), true) === false
-            ) {
-                $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
-                throw OAuthServerException::invalidClient();
-            }
-        } elseif (is_array($client->getRedirectUri()) && count($client->getRedirectUri()) !== 1
-            || empty($client->getRedirectUri())) {
+            $this->validateRedirectUri($redirectUri, $client, $request);
+        } elseif (empty($client->getRedirectUri()) ||
+            (\is_array($client->getRedirectUri()) && \count($client->getRedirectUri()) !== 1)) {
             $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
             throw OAuthServerException::invalidClient();
         } else {
-            $redirectUri = is_array($client->getRedirectUri())
+            $redirectUri = \is_array($client->getRedirectUri())
                 ? $client->getRedirectUri()[0]
                 : $client->getRedirectUri();
         }
@@ -270,7 +273,11 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
         $authorizationRequest->setGrantTypeId($this->getIdentifier());
         $authorizationRequest->setClient($client);
         $authorizationRequest->setRedirectUri($redirectUri);
-        $authorizationRequest->setState($stateParameter);
+
+        if ($stateParameter !== null) {
+            $authorizationRequest->setState($stateParameter);
+        }
+
         $authorizationRequest->setScopes($scopes);
 
         if ($this->enableCodeExchangeProof === true) {
@@ -280,7 +287,8 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
             }
 
             $codeChallengeMethod = $this->getQueryStringParameter('code_challenge_method', $request, 'plain');
-            if (in_array($codeChallengeMethod, ['plain', 'S256'], true) === false) {
+
+            if (\in_array($codeChallengeMethod, ['plain', 'S256'], true) === false) {
                 throw OAuthServerException::invalidRequest(
                     'code_challenge_method',
                     'Code challenge method must be `plain` or `S256`'
@@ -309,14 +317,11 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
     public function completeAuthorizationRequest(AuthorizationRequest $authorizationRequest)
     {
         if ($authorizationRequest->getUser() instanceof UserEntityInterface === false) {
-            throw new \LogicException('An instance of UserEntityInterface should be set on the AuthorizationRequest');
+            throw new LogicException('An instance of UserEntityInterface should be set on the AuthorizationRequest');
         }
 
-        $finalRedirectUri = ($authorizationRequest->getRedirectUri() === null)
-            ? is_array($authorizationRequest->getClient()->getRedirectUri())
-                ? $authorizationRequest->getClient()->getRedirectUri()[0]
-                : $authorizationRequest->getClient()->getRedirectUri()
-            : $authorizationRequest->getRedirectUri();
+        $finalRedirectUri = $authorizationRequest->getRedirectUri()
+                          ?? $this->getClientRedirectUri($authorizationRequest);
 
         // The user approved the client, redirect them back with an auth code
         if ($authorizationRequest->isAuthorizationApproved() === true) {
@@ -334,7 +339,7 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
                 'auth_code_id'          => $authCode->getIdentifier(),
                 'scopes'                => $authCode->getScopes(),
                 'user_id'               => $authCode->getUserIdentifier(),
-                'expire_time'           => (new \DateTime())->add($this->authCodeTTL)->format('U'),
+                'expire_time'           => (new DateTime())->add($this->authCodeTTL)->format('U'),
                 'code_challenge'        => $authorizationRequest->getCodeChallenge(),
                 'code_challenge_method' => $authorizationRequest->getCodeChallengeMethod(),
             ];
@@ -368,4 +373,18 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
             )
         );
     }
+
+    /**
+     * Get the client redirect URI if not set in the request.
+     *
+     * @param AuthorizationRequest $authorizationRequest
+     *
+     * @return string
+     */
+    private function getClientRedirectUri(AuthorizationRequest $authorizationRequest)
+    {
+        return \is_array($authorizationRequest->getClient()->getRedirectUri())
+                ? $authorizationRequest->getClient()->getRedirectUri()[0]
+                : $authorizationRequest->getClient()->getRedirectUri();
+    }
 }

src/Grant/ClientCredentialsGrant.php

@@ -11,6 +11,8 @@
 
 namespace League\OAuth2\Server\Grant;
 
+use DateInterval;
+use League\OAuth2\Server\RequestEvent;
 use League\OAuth2\Server\ResponseTypes\ResponseTypeInterface;
 use Psr\Http\Message\ServerRequestInterface;
 
@@ -25,7 +27,7 @@ class ClientCredentialsGrant extends AbstractGrant
     public function respondToAccessTokenRequest(
         ServerRequestInterface $request,
         ResponseTypeInterface $responseType,
-        \DateInterval $accessTokenTTL
+        DateInterval $accessTokenTTL
     ) {
         // Validate request
         $client = $this->validateClient($request);
@@ -37,6 +39,9 @@ class ClientCredentialsGrant extends AbstractGrant
         // Issue and persist access token
         $accessToken = $this->issueAccessToken($accessTokenTTL, $client, null, $finalizedScopes);
 
+        // Send event to emitter
+        $this->getEmitter()->emit(new RequestEvent(RequestEvent::ACCESS_TOKEN_ISSUED, $request));
+
         // Inject access token into response type
         $responseType->setAccessToken($accessToken);
 

src/Grant/GrantTypeInterface.php

@@ -11,6 +11,8 @@
 
 namespace League\OAuth2\Server\Grant;
 
+use DateInterval;
+use Defuse\Crypto\Key;
 use League\Event\EmitterAwareInterface;
 use League\OAuth2\Server\CryptKey;
 use League\OAuth2\Server\Repositories\AccessTokenRepositoryInterface;
@@ -28,9 +30,9 @@ interface GrantTypeInterface extends EmitterAwareInterface
     /**
      * Set refresh token TTL.
      *
-     * @param \DateInterval $refreshTokenTTL
+     * @param DateInterval $refreshTokenTTL
      */
-    public function setRefreshTokenTTL(\DateInterval $refreshTokenTTL);
+    public function setRefreshTokenTTL(DateInterval $refreshTokenTTL);
 
     /**
      * Return the grant identifier that can be used in matching up requests.
@@ -44,14 +46,14 @@ interface GrantTypeInterface extends EmitterAwareInterface
      *
      * @param ServerRequestInterface $request
      * @param ResponseTypeInterface  $responseType
-     * @param \DateInterval          $accessTokenTTL
+     * @param DateInterval           $accessTokenTTL
      *
      * @return ResponseTypeInterface
      */
     public function respondToAccessTokenRequest(
         ServerRequestInterface $request,
         ResponseTypeInterface $responseType,
-        \DateInterval $accessTokenTTL
+        DateInterval $accessTokenTTL
     );
 
     /**
@@ -136,7 +138,7 @@ interface GrantTypeInterface extends EmitterAwareInterface
     /**
      * Set the encryption key
      *
-     * @param string|null $key
+     * @param string|Key|null $key
      */
     public function setEncryptionKey($key = null);
 }

src/Grant/ImplicitGrant.php

@@ -9,6 +9,8 @@
 
 namespace League\OAuth2\Server\Grant;
 
+use DateInterval;
+use DateTime;
 use League\OAuth2\Server\Entities\ClientEntityInterface;
 use League\OAuth2\Server\Entities\UserEntityInterface;
 use League\OAuth2\Server\Exception\OAuthServerException;
@@ -17,12 +19,13 @@ use League\OAuth2\Server\RequestEvent;
 use League\OAuth2\Server\RequestTypes\AuthorizationRequest;
 use League\OAuth2\Server\ResponseTypes\RedirectResponse;
 use League\OAuth2\Server\ResponseTypes\ResponseTypeInterface;
+use LogicException;
 use Psr\Http\Message\ServerRequestInterface;
 
 class ImplicitGrant extends AbstractAuthorizeGrant
 {
     /**
-     * @var \DateInterval
+     * @var DateInterval
      */
     private $accessTokenTTL;
 
@@ -32,33 +35,33 @@ class ImplicitGrant extends AbstractAuthorizeGrant
     private $queryDelimiter;
 
     /**
-     * @param \DateInterval $accessTokenTTL
-     * @param string        $queryDelimiter
+     * @param DateInterval $accessTokenTTL
+     * @param string       $queryDelimiter
      */
-    public function __construct(\DateInterval $accessTokenTTL, $queryDelimiter = '#')
+    public function __construct(DateInterval $accessTokenTTL, $queryDelimiter = '#')
     {
         $this->accessTokenTTL = $accessTokenTTL;
         $this->queryDelimiter = $queryDelimiter;
     }
 
     /**
-     * @param \DateInterval $refreshTokenTTL
+     * @param DateInterval $refreshTokenTTL
      *
-     * @throw \LogicException
+     * @throw LogicException
      */
-    public function setRefreshTokenTTL(\DateInterval $refreshTokenTTL)
+    public function setRefreshTokenTTL(DateInterval $refreshTokenTTL)
     {
-        throw new \LogicException('The Implicit Grant does not return refresh tokens');
+        throw new LogicException('The Implicit Grant does not return refresh tokens');
     }
 
     /**
      * @param RefreshTokenRepositoryInterface $refreshTokenRepository
      *
-     * @throw \LogicException
+     * @throw LogicException
      */
     public function setRefreshTokenRepository(RefreshTokenRepositoryInterface $refreshTokenRepository)
     {
-        throw new \LogicException('The Implicit Grant does not return refresh tokens');
+        throw new LogicException('The Implicit Grant does not return refresh tokens');
     }
 
     /**
@@ -84,16 +87,16 @@ class ImplicitGrant extends AbstractAuthorizeGrant
      *
      * @param ServerRequestInterface $request
      * @param ResponseTypeInterface  $responseType
-     * @param \DateInterval          $accessTokenTTL
+     * @param DateInterval           $accessTokenTTL
      *
      * @return ResponseTypeInterface
      */
     public function respondToAccessTokenRequest(
         ServerRequestInterface $request,
         ResponseTypeInterface $responseType,
-        \DateInterval $accessTokenTTL
+        DateInterval $accessTokenTTL
     ) {
-        throw new \LogicException('This grant does not used this method');
+        throw new LogicException('This grant does not used this method');
     }
 
     /**
@@ -118,6 +121,7 @@ class ImplicitGrant extends AbstractAuthorizeGrant
             $request,
             $this->getServerParameter('PHP_AUTH_USER', $request)
         );
+
         if (is_null($clientId)) {
             throw OAuthServerException::invalidRequest('client_id');
         }
@@ -135,20 +139,9 @@ class ImplicitGrant extends AbstractAuthorizeGrant
         }
 
         $redirectUri = $this->getQueryStringParameter('redirect_uri', $request);
+
         if ($redirectUri !== null) {
-            if (
-                is_string($client->getRedirectUri())
-                && (strcmp($client->getRedirectUri(), $redirectUri) !== 0)
-            ) {
-                $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
-                throw OAuthServerException::invalidClient();
-            } elseif (
-                is_array($client->getRedirectUri())
-                && in_array($redirectUri, $client->getRedirectUri(), true) === false
-            ) {
-                $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
-                throw OAuthServerException::invalidClient();
-            }
+            $this->validateRedirectUri($redirectUri, $client, $request);
         } elseif (is_array($client->getRedirectUri()) && count($client->getRedirectUri()) !== 1
             || empty($client->getRedirectUri())) {
             $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
@@ -164,21 +157,18 @@ class ImplicitGrant extends AbstractAuthorizeGrant
             $redirectUri
         );
 
-        // Finalize the requested scopes
-        $finalizedScopes = $this->scopeRepository->finalizeScopes(
-            $scopes,
-            $this->getIdentifier(),
-            $client
-        );
-
         $stateParameter = $this->getQueryStringParameter('state', $request);
 
         $authorizationRequest = new AuthorizationRequest();
         $authorizationRequest->setGrantTypeId($this->getIdentifier());
         $authorizationRequest->setClient($client);
         $authorizationRequest->setRedirectUri($redirectUri);
-        $authorizationRequest->setState($stateParameter);
-        $authorizationRequest->setScopes($finalizedScopes);
+
+        if ($stateParameter !== null) {
+            $authorizationRequest->setState($stateParameter);
+        }
+
+        $authorizationRequest->setScopes($scopes);
 
         return $authorizationRequest;
     }
@@ -189,7 +179,7 @@ class ImplicitGrant extends AbstractAuthorizeGrant
     public function completeAuthorizationRequest(AuthorizationRequest $authorizationRequest)
     {
         if ($authorizationRequest->getUser() instanceof UserEntityInterface === false) {
-            throw new \LogicException('An instance of UserEntityInterface should be set on the AuthorizationRequest');
+            throw new LogicException('An instance of UserEntityInterface should be set on the AuthorizationRequest');
         }
 
         $finalRedirectUri = ($authorizationRequest->getRedirectUri() === null)
@@ -200,11 +190,19 @@ class ImplicitGrant extends AbstractAuthorizeGrant
 
         // The user approved the client, redirect them back with an access token
         if ($authorizationRequest->isAuthorizationApproved() === true) {
+            // Finalize the requested scopes
+            $finalizedScopes = $this->scopeRepository->finalizeScopes(
+                $authorizationRequest->getScopes(),
+                $this->getIdentifier(),
+                $authorizationRequest->getClient(),
+                $authorizationRequest->getUser()->getIdentifier()
+            );
+
             $accessToken = $this->issueAccessToken(
                 $this->accessTokenTTL,
                 $authorizationRequest->getClient(),
                 $authorizationRequest->getUser()->getIdentifier(),
-                $authorizationRequest->getScopes()
+                $finalizedScopes
             );
 
             $response = new RedirectResponse();
@@ -214,7 +212,7 @@ class ImplicitGrant extends AbstractAuthorizeGrant
                     [
                         'access_token' => (string) $accessToken->convertToJWT($this->privateKey),
                         'token_type'   => 'Bearer',
-                        'expires_in'   => $accessToken->getExpiryDateTime()->getTimestamp() - (new \DateTime())->getTimestamp(),
+                        'expires_in'   => $accessToken->getExpiryDateTime()->getTimestamp() - (new DateTime())->getTimestamp(),
                         'state'        => $authorizationRequest->getState(),
                     ],
                     $this->queryDelimiter

src/Grant/PasswordGrant.php

@@ -11,6 +11,7 @@
 
 namespace League\OAuth2\Server\Grant;
 
+use DateInterval;
 use League\OAuth2\Server\Entities\ClientEntityInterface;
 use League\OAuth2\Server\Entities\UserEntityInterface;
 use League\OAuth2\Server\Exception\OAuthServerException;
@@ -36,7 +37,7 @@ class PasswordGrant extends AbstractGrant
         $this->setUserRepository($userRepository);
         $this->setRefreshTokenRepository($refreshTokenRepository);
 
-        $this->refreshTokenTTL = new \DateInterval('P1M');
+        $this->refreshTokenTTL = new DateInterval('P1M');
     }
 
     /**
@@ -45,7 +46,7 @@ class PasswordGrant extends AbstractGrant
     public function respondToAccessTokenRequest(
         ServerRequestInterface $request,
         ResponseTypeInterface $responseType,
-        \DateInterval $accessTokenTTL
+        DateInterval $accessTokenTTL
     ) {
         // Validate request
         $client = $this->validateClient($request);
@@ -55,13 +56,18 @@ class PasswordGrant extends AbstractGrant
         // Finalize the requested scopes
         $finalizedScopes = $this->scopeRepository->finalizeScopes($scopes, $this->getIdentifier(), $client, $user->getIdentifier());
 
-        // Issue and persist new tokens
+        // Issue and persist new access token
         $accessToken = $this->issueAccessToken($accessTokenTTL, $client, $user->getIdentifier(), $finalizedScopes);
+        $this->getEmitter()->emit(new RequestEvent(RequestEvent::ACCESS_TOKEN_ISSUED, $request));
+        $responseType->setAccessToken($accessToken);
+
+        // Issue and persist new refresh token if given
         $refreshToken = $this->issueRefreshToken($accessToken);
 
-        // Inject tokens into response
-        $responseType->setAccessToken($accessToken);
-        $responseType->setRefreshToken($refreshToken);
+        if ($refreshToken !== null) {
+            $this->getEmitter()->emit(new RequestEvent(RequestEvent::REFRESH_TOKEN_ISSUED, $request));
+            $responseType->setRefreshToken($refreshToken);
+        }
 
         return $responseType;
     }

src/Grant/RefreshTokenGrant.php

@@ -11,6 +11,8 @@
 
 namespace League\OAuth2\Server\Grant;
 
+use DateInterval;
+use Exception;
 use League\OAuth2\Server\Exception\OAuthServerException;
 use League\OAuth2\Server\Repositories\RefreshTokenRepositoryInterface;
 use League\OAuth2\Server\RequestEvent;
@@ -29,7 +31,7 @@ class RefreshTokenGrant extends AbstractGrant
     {
         $this->setRefreshTokenRepository($refreshTokenRepository);
 
-        $this->refreshTokenTTL = new \DateInterval('P1M');
+        $this->refreshTokenTTL = new DateInterval('P1M');
     }
 
     /**
@@ -38,7 +40,7 @@ class RefreshTokenGrant extends AbstractGrant
     public function respondToAccessTokenRequest(
         ServerRequestInterface $request,
         ResponseTypeInterface $responseType,
-        \DateInterval $accessTokenTTL
+        DateInterval $accessTokenTTL
     ) {
         // Validate request
         $client = $this->validateClient($request);
@@ -61,13 +63,18 @@ class RefreshTokenGrant extends AbstractGrant
         $this->accessTokenRepository->revokeAccessToken($oldRefreshToken['access_token_id']);
         $this->refreshTokenRepository->revokeRefreshToken($oldRefreshToken['refresh_token_id']);
 
-        // Issue and persist new tokens
+        // Issue and persist new access token
         $accessToken = $this->issueAccessToken($accessTokenTTL, $client, $oldRefreshToken['user_id'], $scopes);
+        $this->getEmitter()->emit(new RequestEvent(RequestEvent::ACCESS_TOKEN_ISSUED, $request));
+        $responseType->setAccessToken($accessToken);
+
+        // Issue and persist new refresh token if given
         $refreshToken = $this->issueRefreshToken($accessToken);
 
-        // Inject tokens into response
-        $responseType->setAccessToken($accessToken);
-        $responseType->setRefreshToken($refreshToken);
+        if ($refreshToken !== null) {
+            $this->getEmitter()->emit(new RequestEvent(RequestEvent::REFRESH_TOKEN_ISSUED, $request));
+            $responseType->setRefreshToken($refreshToken);
+        }
 
         return $responseType;
     }
@@ -90,8 +97,8 @@ class RefreshTokenGrant extends AbstractGrant
         // Validate refresh token
         try {
             $refreshToken = $this->decrypt($encryptedRefreshToken);
-        } catch (\Exception $e) {
-            throw OAuthServerException::invalidRefreshToken('Cannot decrypt the refresh token');
+        } catch (Exception $e) {
+            throw OAuthServerException::invalidRefreshToken('Cannot decrypt the refresh token', $e);
         }
 
         $refreshTokenData = json_decode($refreshToken, true);

src/Middleware/AuthorizationServerMiddleware.php

@@ -9,6 +9,7 @@
 
 namespace League\OAuth2\Server\Middleware;
 
+use Exception;
 use League\OAuth2\Server\AuthorizationServer;
 use League\OAuth2\Server\Exception\OAuthServerException;
 use Psr\Http\Message\ResponseInterface;
@@ -43,7 +44,7 @@ class AuthorizationServerMiddleware
         } catch (OAuthServerException $exception) {
             return $exception->generateHttpResponse($response);
             // @codeCoverageIgnoreStart
-        } catch (\Exception $exception) {
+        } catch (Exception $exception) {
             return (new OAuthServerException($exception->getMessage(), 0, 'unknown_error', 500))
                 ->generateHttpResponse($response);
             // @codeCoverageIgnoreEnd

src/Middleware/ResourceServerMiddleware.php

@@ -9,6 +9,7 @@
 
 namespace League\OAuth2\Server\Middleware;
 
+use Exception;
 use League\OAuth2\Server\Exception\OAuthServerException;
 use League\OAuth2\Server\ResourceServer;
 use Psr\Http\Message\ResponseInterface;
@@ -34,7 +35,7 @@ class ResourceServerMiddleware
      * @param ResponseInterface      $response
      * @param callable               $next
      *
-     * @return \Psr\Http\Message\ResponseInterface
+     * @return ResponseInterface
      */
     public function __invoke(ServerRequestInterface $request, ResponseInterface $response, callable $next)
     {
@@ -43,7 +44,7 @@ class ResourceServerMiddleware
         } catch (OAuthServerException $exception) {
             return $exception->generateHttpResponse($response);
             // @codeCoverageIgnoreStart
-        } catch (\Exception $exception) {
+        } catch (Exception $exception) {
             return (new OAuthServerException($exception->getMessage(), 0, 'unknown_error', 500))
                 ->generateHttpResponse($response);
             // @codeCoverageIgnoreEnd

src/Repositories/RefreshTokenRepositoryInterface.php

@@ -20,7 +20,7 @@ interface RefreshTokenRepositoryInterface extends RepositoryInterface
     /**
      * Creates a new refresh token
      *
-     * @return RefreshTokenEntityInterface
+     * @return RefreshTokenEntityInterface|null
      */
     public function getNewRefreshToken();
 

src/RequestEvent.php

@@ -18,6 +18,9 @@ class RequestEvent extends Event
     const USER_AUTHENTICATION_FAILED = 'user.authentication.failed';
     const REFRESH_TOKEN_CLIENT_FAILED = 'refresh_token.client.failed';
 
+    const REFRESH_TOKEN_ISSUED = 'refresh_token.issued';
+    const ACCESS_TOKEN_ISSUED = 'access_token.issued';
+
     /**
      * @var ServerRequestInterface
      */

src/RequestTypes/AuthorizationRequest.php

@@ -60,7 +60,7 @@ class AuthorizationRequest
     /**
      * The state parameter on the authorization request
      *
-     * @var string
+     * @var string|null
      */
     protected $state;
 
@@ -175,7 +175,7 @@ class AuthorizationRequest
     }
 
     /**
-     * @return string
+     * @return string|null
      */
     public function getState()
     {

src/ResponseTypes/AbstractResponseType.php

@@ -54,7 +54,7 @@ abstract class AbstractResponseType implements ResponseTypeInterface
     /**
      * Set the private key
      *
-     * @param \League\OAuth2\Server\CryptKey $key
+     * @param CryptKey $key
      */
     public function setPrivateKey(CryptKey $key)
     {

src/ResponseTypes/BearerTokenResponse.php

@@ -11,6 +11,7 @@
 
 namespace League\OAuth2\Server\ResponseTypes;
 
+use DateTime;
 use League\OAuth2\Server\Entities\AccessTokenEntityInterface;
 use League\OAuth2\Server\Entities\RefreshTokenEntityInterface;
 use Psr\Http\Message\ResponseInterface;
@@ -28,7 +29,7 @@ class BearerTokenResponse extends AbstractResponseType
 
         $responseParams = [
             'token_type'   => 'Bearer',
-            'expires_in'   => $expireDateTime - (new \DateTime())->getTimestamp(),
+            'expires_in'   => $expireDateTime - (new DateTime())->getTimestamp(),
             'access_token' => (string) $jwtAccessToken,
         ];
 

src/ResponseTypes/ResponseTypeInterface.php

@@ -11,6 +11,7 @@
 
 namespace League\OAuth2\Server\ResponseTypes;
 
+use Defuse\Crypto\Key;
 use League\OAuth2\Server\Entities\AccessTokenEntityInterface;
 use League\OAuth2\Server\Entities\RefreshTokenEntityInterface;
 use Psr\Http\Message\ResponseInterface;
@@ -37,7 +38,7 @@ interface ResponseTypeInterface
     /**
      * Set the encryption key
      *
-     * @param string|null $key
+     * @param string|Key|null $key
      */
     public function setEncryptionKey($key = null);
 }

tests/AuthorizationServerTest.php

@@ -3,6 +3,7 @@
 namespace LeagueTests;
 
 use League\OAuth2\Server\AuthorizationServer;
+use League\OAuth2\Server\CryptKey;
 use League\OAuth2\Server\Exception\OAuthServerException;
 use League\OAuth2\Server\Grant\AuthCodeGrant;
 use League\OAuth2\Server\Grant\ClientCredentialsGrant;
@@ -109,6 +110,95 @@ class AuthorizationServerTest extends TestCase
         $this->assertInstanceOf(BearerTokenResponse::class, $method->invoke($server));
     }
 
+    public function testGetResponseTypeExtended()
+    {
+        $clientRepository = $this->getMockBuilder(ClientRepositoryInterface::class)->getMock();
+        $privateKey = 'file://' . __DIR__ . '/Stubs/private.key';
+        $encryptionKey = 'file://' . __DIR__ . '/Stubs/public.key';
+
+        $server = new class($clientRepository, $this->getMockBuilder(AccessTokenRepositoryInterface::class)->getMock(), $this->getMockBuilder(ScopeRepositoryInterface::class)->getMock(), $privateKey, $encryptionKey) extends AuthorizationServer {
+            protected function getResponseType()
+            {
+                $this->responseType = new class extends BearerTokenResponse {
+                    /* @return null|CryptKey */
+                    public function getPrivateKey()
+                    {
+                        return $this->privateKey;
+                    }
+
+                    public function getEncryptionKey()
+                    {
+                        return $this->encryptionKey;
+                    }
+                };
+
+                return parent::getResponseType();
+            }
+        };
+
+        $abstractGrantReflection = new \ReflectionClass($server);
+        $method = $abstractGrantReflection->getMethod('getResponseType');
+        $method->setAccessible(true);
+        $responseType = $method->invoke($server);
+
+        $this->assertInstanceOf(BearerTokenResponse::class, $responseType);
+        // generated instances should have keys setup
+        $this->assertSame($privateKey, $responseType->getPrivateKey()->getKeyPath());
+        $this->assertSame($encryptionKey, $responseType->getEncryptionKey());
+    }
+
+    public function testMultipleRequestsGetDifferentResponseTypeInstances()
+    {
+        $privateKey = 'file://' . __DIR__ . '/Stubs/private.key';
+        $encryptionKey = 'file://' . __DIR__ . '/Stubs/public.key';
+
+        $responseTypePrototype = new class extends BearerTokenResponse {
+            /* @return null|CryptKey */
+            public function getPrivateKey()
+            {
+                return $this->privateKey;
+            }
+
+            public function getEncryptionKey()
+            {
+                return $this->encryptionKey;
+            }
+        };
+
+        $clientRepository = $this->getMockBuilder(ClientRepositoryInterface::class)->getMock();
+
+        $server = new AuthorizationServer(
+            $clientRepository,
+            $this->getMockBuilder(AccessTokenRepositoryInterface::class)->getMock(),
+            $this->getMockBuilder(ScopeRepositoryInterface::class)->getMock(),
+            $privateKey,
+            $encryptionKey,
+            $responseTypePrototype
+        );
+
+        $abstractGrantReflection = new \ReflectionClass($server);
+        $method = $abstractGrantReflection->getMethod('getResponseType');
+        $method->setAccessible(true);
+
+        $responseTypeA = $method->invoke($server);
+        $responseTypeB = $method->invoke($server);
+
+        // prototype should not get changed
+        $this->assertNull($responseTypePrototype->getPrivateKey());
+        $this->assertNull($responseTypePrototype->getEncryptionKey());
+
+        // generated instances should have keys setup
+        $this->assertSame($privateKey, $responseTypeA->getPrivateKey()->getKeyPath());
+        $this->assertSame($encryptionKey, $responseTypeA->getEncryptionKey());
+
+        // all instances should be different but based on the same prototype
+        $this->assertSame(get_class($responseTypePrototype), get_class($responseTypeA));
+        $this->assertSame(get_class($responseTypePrototype), get_class($responseTypeB));
+        $this->assertNotSame($responseTypePrototype, $responseTypeA);
+        $this->assertNotSame($responseTypePrototype, $responseTypeB);
+        $this->assertNotSame($responseTypeA, $responseTypeB);
+    }
+
     public function testCompleteAuthorizationRequest()
     {
         $clientRepository = $this->getMockBuilder(ClientRepositoryInterface::class)->getMock();

tests/AuthorizationValidators/BearerTokenValidatorTest.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace LeagueTests\AuthorizationValidators;
+
+use Lcobucci\JWT\Builder;
+use League\OAuth2\Server\AuthorizationValidators\BearerTokenValidator;
+use League\OAuth2\Server\CryptKey;
+use League\OAuth2\Server\Repositories\AccessTokenRepositoryInterface;
+use PHPUnit\Framework\TestCase;
+use Zend\Diactoros\ServerRequest;
+
+class BearerTokenValidatorTest extends TestCase
+{
+    /**
+     * @expectedException League\OAuth2\Server\Exception\OAuthServerException
+     * @expectedExceptionCode 9
+     */
+    public function testThrowExceptionWhenAccessTokenIsNotSigned()
+    {
+        $accessTokenRepositoryMock = $this->getMockBuilder(AccessTokenRepositoryInterface::class)->getMock();
+
+        $bearerTokenValidator = new BearerTokenValidator($accessTokenRepositoryMock);
+        $bearerTokenValidator->setPublicKey(new CryptKey('file://' . __DIR__ . '/../Stubs/public.key'));
+
+        $unsignedJwt = (new Builder())
+            ->setAudience('client-id')
+            ->setId('token-id', true)
+            ->setIssuedAt(time())
+            ->setNotBefore(time())
+            ->setExpiration(time())
+            ->setSubject('user-id')
+            ->set('scopes', 'scope1 scope2 scope3 scope4')
+            ->getToken();
+
+        $request = new ServerRequest();
+        $request = $request->withHeader('authorization', sprintf('Bearer %s', $unsignedJwt));
+
+        $bearerTokenValidator->validateAuthorization($request);
+    }
+}

tests/Exception/OAuthServerExceptionTest.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace LeagueTests\Exception;
+
+use Exception;
+use League\OAuth2\Server\Exception\OAuthServerException;
+use PHPUnit\Framework\TestCase;
+
+class OAuthServerExceptionTest extends TestCase
+{
+    public function testHasRedirect()
+    {
+        $exceptionWithRedirect = OAuthServerException::accessDenied('some hint', 'https://example.com/error');
+
+        $this->assertTrue($exceptionWithRedirect->hasRedirect());
+    }
+
+    public function testDoesNotHaveRedirect()
+    {
+        $exceptionWithoutRedirect = OAuthServerException::accessDenied('Some hint');
+
+        $this->assertFalse($exceptionWithoutRedirect->hasRedirect());
+    }
+
+    public function testHasPrevious()
+    {
+        $previous = new Exception('This is the previous');
+        $exceptionWithPrevious = OAuthServerException::accessDenied(null, null, $previous);
+
+        $this->assertSame('This is the previous', $exceptionWithPrevious->getPrevious()->getMessage());
+    }
+
+    public function testDoesNotHavePrevious()
+    {
+        $exceptionWithoutPrevious = OAuthServerException::accessDenied();
+
+        $this->assertNull($exceptionWithoutPrevious->getPrevious());
+    }
+}

tests/Grant/AbstractGrantTest.php

@@ -346,6 +346,27 @@ class AbstractGrantTest extends TestCase
         $this->assertEquals($accessToken, $refreshToken->getAccessToken());
     }
 
+    public function testIssueNullRefreshToken()
+    {
+        $refreshTokenRepoMock = $this->getMockBuilder(RefreshTokenRepositoryInterface::class)->getMock();
+        $refreshTokenRepoMock
+            ->expects($this->once())
+            ->method('getNewRefreshToken')
+            ->willReturn(null);
+
+        /** @var AbstractGrant $grantMock */
+        $grantMock = $this->getMockForAbstractClass(AbstractGrant::class);
+        $grantMock->setRefreshTokenTTL(new \DateInterval('PT1M'));
+        $grantMock->setRefreshTokenRepository($refreshTokenRepoMock);
+
+        $abstractGrantReflection = new \ReflectionClass($grantMock);
+        $issueRefreshTokenMethod = $abstractGrantReflection->getMethod('issueRefreshToken');
+        $issueRefreshTokenMethod->setAccessible(true);
+
+        $accessToken = new AccessTokenEntity();
+        $this->assertNull($issueRefreshTokenMethod->invoke($grantMock, $accessToken));
+    }
+
     public function testIssueAccessToken()
     {
         $accessTokenRepoMock = $this->getMockBuilder(AccessTokenRepositoryInterface::class)->getMock();

tests/Grant/AuthCodeGrantTest.php

@@ -644,6 +644,73 @@ class AuthCodeGrantTest extends TestCase
         $this->assertInstanceOf(RefreshTokenEntityInterface::class, $response->getRefreshToken());
     }
 
+    public function testRespondToAccessTokenRequestNullRefreshToken()
+    {
+        $client = new ClientEntity();
+        $client->setIdentifier('foo');
+        $client->setRedirectUri('http://foo/bar');
+        $clientRepositoryMock = $this->getMockBuilder(ClientRepositoryInterface::class)->getMock();
+        $clientRepositoryMock->method('getClientEntity')->willReturn($client);
+
+        $scopeRepositoryMock = $this->getMockBuilder(ScopeRepositoryInterface::class)->getMock();
+        $scopeEntity = new ScopeEntity();
+        $scopeRepositoryMock->method('getScopeEntityByIdentifier')->willReturn($scopeEntity);
+        $scopeRepositoryMock->method('finalizeScopes')->willReturnArgument(0);
+
+        $accessTokenRepositoryMock = $this->getMockBuilder(AccessTokenRepositoryInterface::class)->getMock();
+        $accessTokenRepositoryMock->method('getNewToken')->willReturn(new AccessTokenEntity());
+        $accessTokenRepositoryMock->method('persistNewAccessToken')->willReturnSelf();
+
+        $refreshTokenRepositoryMock = $this->getMockBuilder(RefreshTokenRepositoryInterface::class)->getMock();
+        $refreshTokenRepositoryMock->method('persistNewRefreshToken')->willReturnSelf();
+        $refreshTokenRepositoryMock->method('getNewRefreshToken')->willReturn(null);
+
+        $grant = new AuthCodeGrant(
+            $this->getMockBuilder(AuthCodeRepositoryInterface::class)->getMock(),
+            $refreshTokenRepositoryMock,
+            new \DateInterval('PT10M')
+        );
+
+        $grant->setClientRepository($clientRepositoryMock);
+        $grant->setScopeRepository($scopeRepositoryMock);
+        $grant->setAccessTokenRepository($accessTokenRepositoryMock);
+        $grant->setEncryptionKey($this->cryptStub->getKey());
+
+        $request = new ServerRequest(
+            [],
+            [],
+            null,
+            'POST',
+            'php://input',
+            [],
+            [],
+            [],
+            [
+                'grant_type'   => 'authorization_code',
+                'client_id'    => 'foo',
+                'redirect_uri' => 'http://foo/bar',
+                'code'         => $this->cryptStub->doEncrypt(
+                    json_encode(
+                        [
+                            'auth_code_id' => uniqid(),
+                            'expire_time'  => time() + 3600,
+                            'client_id'    => 'foo',
+                            'user_id'      => 123,
+                            'scopes'       => ['foo'],
+                            'redirect_uri' => 'http://foo/bar',
+                        ]
+                    )
+                ),
+            ]
+        );
+
+        /** @var StubResponseType $response */
+        $response = $grant->respondToAccessTokenRequest($request, new StubResponseType(), new \DateInterval('PT10M'));
+
+        $this->assertInstanceOf(AccessTokenEntityInterface::class, $response->getAccessToken());
+        $this->assertNull($response->getRefreshToken());
+    }
+
     public function testRespondToAccessTokenRequestCodeChallengePlain()
     {
         $client = new ClientEntity();

tests/Grant/ImplicitGrantTest.php

@@ -94,7 +94,6 @@ class ImplicitGrantTest extends TestCase
         $scopeRepositoryMock = $this->getMockBuilder(ScopeRepositoryInterface::class)->getMock();
         $scopeEntity = new ScopeEntity();
         $scopeRepositoryMock->method('getScopeEntityByIdentifier')->willReturn($scopeEntity);
-        $scopeRepositoryMock->method('finalizeScopes')->willReturnArgument(0);
 
         $grant = new ImplicitGrant(new \DateInterval('PT10M'));
         $grant->setClientRepository($clientRepositoryMock);
@@ -129,7 +128,6 @@ class ImplicitGrantTest extends TestCase
         $scopeRepositoryMock = $this->getMockBuilder(ScopeRepositoryInterface::class)->getMock();
         $scopeEntity = new ScopeEntity();
         $scopeRepositoryMock->method('getScopeEntityByIdentifier')->willReturn($scopeEntity);
-        $scopeRepositoryMock->method('finalizeScopes')->willReturnArgument(0);
 
         $grant = new ImplicitGrant(new \DateInterval('PT10M'));
         $grant->setClientRepository($clientRepositoryMock);
@@ -286,9 +284,13 @@ class ImplicitGrantTest extends TestCase
         $accessTokenRepositoryMock->method('getNewToken')->willReturn(new AccessTokenEntity());
         $accessTokenRepositoryMock->method('persistNewAccessToken')->willReturnSelf();
 
+        $scopeRepositoryMock = $this->getMockBuilder(ScopeRepositoryInterface::class)->getMock();
+        $scopeRepositoryMock->method('finalizeScopes')->willReturnArgument(0);
+
         $grant = new ImplicitGrant(new \DateInterval('PT10M'));
         $grant->setPrivateKey(new CryptKey('file://' . __DIR__ . '/../Stubs/private.key'));
         $grant->setAccessTokenRepository($accessTokenRepositoryMock);
+        $grant->setScopeRepository($scopeRepositoryMock);
 
         $this->assertInstanceOf(RedirectResponse::class, $grant->completeAuthorizationRequest($authRequest));
     }
@@ -309,9 +311,13 @@ class ImplicitGrantTest extends TestCase
         $accessTokenRepositoryMock->method('getNewToken')->willReturn(new AccessTokenEntity());
         $accessTokenRepositoryMock->method('persistNewAccessToken')->willReturnSelf();
 
+        $scopeRepositoryMock = $this->getMockBuilder(ScopeRepositoryInterface::class)->getMock();
+        $scopeRepositoryMock->method('finalizeScopes')->willReturnArgument(0);
+
         $grant = new ImplicitGrant(new \DateInterval('PT10M'));
         $grant->setPrivateKey(new CryptKey('file://' . __DIR__ . '/../Stubs/private.key'));
         $grant->setAccessTokenRepository($accessTokenRepositoryMock);
+        $grant->setScopeRepository($scopeRepositoryMock);
 
         $grant->completeAuthorizationRequest($authRequest);
     }
@@ -330,9 +336,13 @@ class ImplicitGrantTest extends TestCase
         $accessTokenRepositoryMock->expects($this->at(0))->method('persistNewAccessToken')->willThrowException(UniqueTokenIdentifierConstraintViolationException::create());
         $accessTokenRepositoryMock->expects($this->at(1))->method('persistNewAccessToken')->willReturnSelf();
 
+        $scopeRepositoryMock = $this->getMockBuilder(ScopeRepositoryInterface::class)->getMock();
+        $scopeRepositoryMock->method('finalizeScopes')->willReturnArgument(0);
+
         $grant = new ImplicitGrant(new \DateInterval('PT10M'));
         $grant->setPrivateKey(new CryptKey('file://' . __DIR__ . '/../Stubs/private.key'));
         $grant->setAccessTokenRepository($accessTokenRepositoryMock);
+        $grant->setScopeRepository($scopeRepositoryMock);
 
         $this->assertInstanceOf(RedirectResponse::class, $grant->completeAuthorizationRequest($authRequest));
     }
@@ -354,9 +364,13 @@ class ImplicitGrantTest extends TestCase
         $accessTokenRepositoryMock->method('getNewToken')->willReturn(new AccessTokenEntity());
         $accessTokenRepositoryMock->method('persistNewAccessToken')->willThrowException(OAuthServerException::serverError('something bad happened'));
 
+        $scopeRepositoryMock = $this->getMockBuilder(ScopeRepositoryInterface::class)->getMock();
+        $scopeRepositoryMock->method('finalizeScopes')->willReturnArgument(0);
+
         $grant = new ImplicitGrant(new \DateInterval('PT10M'));
         $grant->setPrivateKey(new CryptKey('file://' . __DIR__ . '/../Stubs/private.key'));
         $grant->setAccessTokenRepository($accessTokenRepositoryMock);
+        $grant->setScopeRepository($scopeRepositoryMock);
 
         $grant->completeAuthorizationRequest($authRequest);
     }
@@ -378,9 +392,13 @@ class ImplicitGrantTest extends TestCase
         $accessTokenRepositoryMock->method('getNewToken')->willReturn(new AccessTokenEntity());
         $accessTokenRepositoryMock->method('persistNewAccessToken')->willThrowException(UniqueTokenIdentifierConstraintViolationException::create());
 
+        $scopeRepositoryMock = $this->getMockBuilder(ScopeRepositoryInterface::class)->getMock();
+        $scopeRepositoryMock->method('finalizeScopes')->willReturnArgument(0);
+
         $grant = new ImplicitGrant(new \DateInterval('PT10M'));
         $grant->setPrivateKey(new CryptKey('file://' . __DIR__ . '/../Stubs/private.key'));
         $grant->setAccessTokenRepository($accessTokenRepositoryMock);
+        $grant->setScopeRepository($scopeRepositoryMock);
 
         $grant->completeAuthorizationRequest($authRequest);
     }

tests/Grant/PasswordGrantTest.php

@@ -78,6 +78,51 @@ class PasswordGrantTest extends TestCase
         $this->assertInstanceOf(RefreshTokenEntityInterface::class, $responseType->getRefreshToken());
     }
 
+    public function testRespondToRequestNullRefreshToken()
+    {
+        $client = new ClientEntity();
+        $clientRepositoryMock = $this->getMockBuilder(ClientRepositoryInterface::class)->getMock();
+        $clientRepositoryMock->method('getClientEntity')->willReturn($client);
+
+        $accessTokenRepositoryMock = $this->getMockBuilder(AccessTokenRepositoryInterface::class)->getMock();
+        $accessTokenRepositoryMock->method('getNewToken')->willReturn(new AccessTokenEntity());
+        $accessTokenRepositoryMock->method('persistNewAccessToken')->willReturnSelf();
+
+        $userRepositoryMock = $this->getMockBuilder(UserRepositoryInterface::class)->getMock();
+        $userEntity = new UserEntity();
+        $userRepositoryMock->method('getUserEntityByUserCredentials')->willReturn($userEntity);
+
+        $scope = new ScopeEntity();
+        $scopeRepositoryMock = $this->getMockBuilder(ScopeRepositoryInterface::class)->getMock();
+        $scopeRepositoryMock->method('getScopeEntityByIdentifier')->willReturn($scope);
+        $scopeRepositoryMock->method('finalizeScopes')->willReturnArgument(0);
+
+        $refreshTokenRepositoryMock = $this->getMockBuilder(RefreshTokenRepositoryInterface::class)->getMock();
+        $refreshTokenRepositoryMock->method('getNewRefreshToken')->willReturn(null);
+
+        $grant = new PasswordGrant($userRepositoryMock, $refreshTokenRepositoryMock);
+        $grant->setClientRepository($clientRepositoryMock);
+        $grant->setAccessTokenRepository($accessTokenRepositoryMock);
+        $grant->setScopeRepository($scopeRepositoryMock);
+        $grant->setDefaultScope(self::DEFAULT_SCOPE);
+
+        $serverRequest = new ServerRequest();
+        $serverRequest = $serverRequest->withParsedBody(
+            [
+                'client_id'     => 'foo',
+                'client_secret' => 'bar',
+                'username'      => 'foo',
+                'password'      => 'bar',
+            ]
+        );
+
+        $responseType = new StubResponseType();
+        $grant->respondToAccessTokenRequest($serverRequest, $responseType, new \DateInterval('PT5M'));
+
+        $this->assertInstanceOf(AccessTokenEntityInterface::class, $responseType->getAccessToken());
+        $this->assertNull($responseType->getRefreshToken());
+    }
+
     /**
      * @expectedException \League\OAuth2\Server\Exception\OAuthServerException
      */

tests/Grant/RefreshTokenGrantTest.php

@@ -94,6 +94,63 @@ class RefreshTokenGrantTest extends TestCase
         $this->assertInstanceOf(RefreshTokenEntityInterface::class, $responseType->getRefreshToken());
     }
 
+    public function testRespondToRequestNullRefreshToken()
+    {
+        $client = new ClientEntity();
+        $client->setIdentifier('foo');
+
+        $clientRepositoryMock = $this->getMockBuilder(ClientRepositoryInterface::class)->getMock();
+        $clientRepositoryMock->method('getClientEntity')->willReturn($client);
+
+        $scopeEntity = new ScopeEntity();
+        $scopeEntity->setIdentifier('foo');
+
+        $scopeRepositoryMock = $this->getMockBuilder(ScopeRepositoryInterface::class)->getMock();
+        $scopeRepositoryMock->method('getScopeEntityByIdentifier')->willReturn($scopeEntity);
+
+        $accessTokenRepositoryMock = $this->getMockBuilder(AccessTokenRepositoryInterface::class)->getMock();
+        $accessTokenRepositoryMock->method('getNewToken')->willReturn(new AccessTokenEntity());
+        $accessTokenRepositoryMock->expects($this->once())->method('persistNewAccessToken')->willReturnSelf();
+
+        $refreshTokenRepositoryMock = $this->getMockBuilder(RefreshTokenRepositoryInterface::class)->getMock();
+        $refreshTokenRepositoryMock->method('getNewRefreshToken')->willReturn(null);
+        $refreshTokenRepositoryMock->expects($this->never())->method('persistNewRefreshToken');
+
+        $grant = new RefreshTokenGrant($refreshTokenRepositoryMock);
+        $grant->setClientRepository($clientRepositoryMock);
+        $grant->setScopeRepository($scopeRepositoryMock);
+        $grant->setAccessTokenRepository($accessTokenRepositoryMock);
+        $grant->setEncryptionKey($this->cryptStub->getKey());
+        $grant->setPrivateKey(new CryptKey('file://' . __DIR__ . '/../Stubs/private.key'));
+
+        $oldRefreshToken = $this->cryptStub->doEncrypt(
+            json_encode(
+                [
+                    'client_id'        => 'foo',
+                    'refresh_token_id' => 'zyxwvu',
+                    'access_token_id'  => 'abcdef',
+                    'scopes'           => ['foo'],
+                    'user_id'          => 123,
+                    'expire_time'      => time() + 3600,
+                ]
+            )
+        );
+
+        $serverRequest = new ServerRequest();
+        $serverRequest = $serverRequest->withParsedBody([
+            'client_id'     => 'foo',
+            'client_secret' => 'bar',
+            'refresh_token' => $oldRefreshToken,
+            'scopes'        => ['foo'],
+        ]);
+
+        $responseType = new StubResponseType();
+        $grant->respondToAccessTokenRequest($serverRequest, $responseType, new \DateInterval('PT5M'));
+
+        $this->assertInstanceOf(AccessTokenEntityInterface::class, $responseType->getAccessToken());
+        $this->assertNull($responseType->getRefreshToken());
+    }
+
     public function testRespondToReducedScopes()
     {
         $client = new ClientEntity();

tests/Middleware/AuthorizationServerMiddlewareTest.php

@@ -104,7 +104,7 @@ class AuthorizationServerMiddlewareTest extends TestCase
         $response = $exception->generateHttpResponse(new Response());
 
         $this->assertEquals(302, $response->getStatusCode());
-        $this->assertEquals('http://foo/bar?error=invalid_scope&message=The+requested+scope+is+invalid%2C+unknown%2C+or+malformed&hint=Check+the+%60test%60+scope',
+        $this->assertEquals('http://foo/bar?error=invalid_scope&error_description=The+requested+scope+is+invalid%2C+unknown%2C+or+malformed&hint=Check+the+%60test%60+scope&message=The+requested+scope+is+invalid%2C+unknown%2C+or+malformed',
             $response->getHeader('location')[0]);
     }
 
@@ -114,7 +114,7 @@ class AuthorizationServerMiddlewareTest extends TestCase
         $response = $exception->generateHttpResponse(new Response(), true);
 
         $this->assertEquals(302, $response->getStatusCode());
-        $this->assertEquals('http://foo/bar#error=invalid_scope&message=The+requested+scope+is+invalid%2C+unknown%2C+or+malformed&hint=Check+the+%60test%60+scope',
+        $this->assertEquals('http://foo/bar#error=invalid_scope&error_description=The+requested+scope+is+invalid%2C+unknown%2C+or+malformed&hint=Check+the+%60test%60+scope&message=The+requested+scope+is+invalid%2C+unknown%2C+or+malformed',
             $response->getHeader('location')[0]);
     }
 }

tests/PHPStan/AbstractGrantExtension.php

@@ -0,0 +1,39 @@
+<?php
+declare(strict_types = 1);
+
+namespace LeagueTests\PHPStan;
+
+use League\OAuth2\Server\Grant\AbstractGrant;
+use PhpParser\Node\Expr\MethodCall;
+use PHPStan\Analyser\Scope;
+use PHPStan\Reflection\MethodReflection;
+use PHPStan\Type\DynamicMethodReturnTypeExtension;
+use PHPStan\Type\NullType;
+use PHPStan\Type\StringType;
+use PHPStan\Type\Type;
+use PHPStan\Type\TypeCombinator;
+
+final class AbstractGrantExtension implements DynamicMethodReturnTypeExtension
+{
+    public function getClass(): string
+    {
+        return AbstractGrant::class;
+    }
+
+    public function isMethodSupported(MethodReflection $methodReflection): bool
+    {
+        return in_array($methodReflection->getName(), [
+            'getRequestParameter',
+            'getQueryStringParameter',
+            'getCookieParameter',
+        ], true);
+    }
+
+    public function getTypeFromMethodCall(MethodReflection $methodReflection, MethodCall $methodCall, Scope $scope): Type
+    {
+        return TypeCombinator::union(...[
+            new StringType(),
+            isset($methodCall->args[2]) ? $scope->getType($methodCall->args[2]->value) : new NullType(),
+        ]);
+    }
+}

tests/Utils/CryptTraitTest.php

@@ -2,22 +2,34 @@
 
 namespace LeagueTests\Utils;
 
+use Defuse\Crypto\Key;
 use LeagueTests\Stubs\CryptTraitStub;
 use PHPUnit\Framework\TestCase;
 
 class CryptTraitTest extends TestCase
 {
-    /**
-     * @var \LeagueTests\Stubs\CryptTraitStub
-     */
     protected $cryptStub;
 
-    public function setUp()
+    protected function setUp()
     {
-        $this->cryptStub = new CryptTraitStub;
+        $this->cryptStub = new CryptTraitStub();
     }
 
-    public function testEncryptDecrypt()
+    public function testEncryptDecryptWithPassword()
+    {
+        $this->cryptStub->setEncryptionKey(base64_encode(random_bytes(36)));
+
+        $this->encryptDecrypt();
+    }
+
+    public function testEncryptDecryptWithKey()
+    {
+        $this->cryptStub->setEncryptionKey(Key::createNewRandomKey());
+
+        $this->encryptDecrypt();
+    }
+
+    private function encryptDecrypt()
     {
         $payload = 'alex loves whisky';
         $encrypted = $this->cryptStub->doEncrypt($payload);