From f43c1a9a37df05c8da01a37ec8d5d783d170e112 Mon Sep 17 00:00:00 2001
From: ErickSkrauch <erickskrauch@yandex.ru>
Date: Sun, 26 Apr 2020 21:56:03 +0300
Subject: [PATCH] Resolves #23. Allow to spoof Mojang's API addresses

---
 CHANGELOG.md          |  4 +++-
 README.md             | 14 ++++++++++++++
 api/mojang/mojang.go  | 15 ++++++++++++---
 di/mojang_textures.go | 26 ++++++++++++++++++++++++++
 4 files changed, 55 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4c6ced5..237bfac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,7 +8,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - [#24](https://github.com/elyby/chrly/issues/24): Implemented a new strategy for the queue in the batch provider of
   Mojang UUIDs: `full-bus`.
-- A new configuration param `QUEUE_STRATEGY` with the default value `periodic`.
+- New configuration param `QUEUE_STRATEGY` with the default value `periodic`.
+- New configuration params: `MOJANG_API_BASE_URL` and `MOJANG_SESSION_SERVER_BASE_URL`, that allow you to spoof
+  Mojang API base addresses.
 
 ### Changed
 - `ely.skinsystem.{hostname}.app.mojang_textures.usernames.round_time` timer will not be recorded if the iteration was
diff --git a/README.md b/README.md
index 95e7dcc..39db1d9 100644
--- a/README.md
+++ b/README.md
@@ -145,6 +145,20 @@ docker-compose up -d app
         </td>
         <td><code>http://remote-provider.com/api/worker/mojang-uuid</code></td>
     </tr>
+    <tr>
+        <td>MOJANG_API_BASE_URL</td>
+        <td>
+            Allows you to spoof the Mojang's API server address.
+        </td>
+        <td><code>https://api.mojang.com</code></td>
+    </tr>
+    <tr>
+        <td>MOJANG_SESSION_SERVER_BASE_URL</td>
+        <td>
+            Allows you to spoof the Mojang's Session server address.
+        </td>
+        <td><code>https://sessionserver.mojang.com</code></td>
+    </tr>
     <tr>
         <td>TEXTURES_EXTRA_PARAM_NAME</td>
         <td>
diff --git a/api/mojang/mojang.go b/api/mojang/mojang.go
index 7527b97..a50a015 100644
--- a/api/mojang/mojang.go
+++ b/api/mojang/mojang.go
@@ -58,11 +58,17 @@ type ProfileInfo struct {
 	IsDemo   bool   `json:"demo,omitempty"`
 }
 
+var ApiMojangDotComAddr = "https://api.mojang.com"
+var SessionServerMojangComAddr = "https://sessionserver.mojang.com"
+
 // Exchanges usernames array to array of uuids
 // See https://wiki.vg/Mojang_API#Playernames_-.3E_UUIDs
 func UsernamesToUuids(usernames []string) ([]*ProfileInfo, error) {
 	requestBody, _ := json.Marshal(usernames)
-	request, _ := http.NewRequest("POST", "https://api.mojang.com/profiles/minecraft", bytes.NewBuffer(requestBody))
+	request, err := http.NewRequest("POST", ApiMojangDotComAddr+"/profiles/minecraft", bytes.NewBuffer(requestBody))
+	if err != nil {
+		return nil, err
+	}
 
 	request.Header.Set("Content-Type", "application/json")
 
@@ -88,12 +94,15 @@ func UsernamesToUuids(usernames []string) ([]*ProfileInfo, error) {
 // See https://wiki.vg/Mojang_API#UUID_-.3E_Profile_.2B_Skin.2FCape
 func UuidToTextures(uuid string, signed bool) (*SignedTexturesResponse, error) {
 	normalizedUuid := strings.ReplaceAll(uuid, "-", "")
-	url := "https://sessionserver.mojang.com/session/minecraft/profile/" + normalizedUuid
+	url := SessionServerMojangComAddr + "/session/minecraft/profile/" + normalizedUuid
 	if signed {
 		url += "?unsigned=false"
 	}
 
-	request, _ := http.NewRequest("GET", url, nil)
+	request, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
 
 	response, err := HttpClient.Do(request)
 	if err != nil {
diff --git a/di/mojang_textures.go b/di/mojang_textures.go
index 42f385c..10cfdea 100644
--- a/di/mojang_textures.go
+++ b/di/mojang_textures.go
@@ -9,12 +9,14 @@ import (
 	"github.com/goava/di"
 	"github.com/spf13/viper"
 
+	"github.com/elyby/chrly/api/mojang"
 	es "github.com/elyby/chrly/eventsubscribers"
 	"github.com/elyby/chrly/http"
 	"github.com/elyby/chrly/mojangtextures"
 )
 
 var mojangTextures = di.Options(
+	di.Invoke(interceptMojangApiUrls),
 	di.Provide(newMojangTexturesProviderFactory),
 	di.Provide(newMojangTexturesProvider),
 	di.Provide(newMojangTexturesUuidsProviderFactory),
@@ -27,6 +29,30 @@ var mojangTextures = di.Options(
 	di.Provide(newMojangTexturesStorageFactory),
 )
 
+func interceptMojangApiUrls(config *viper.Viper) error {
+	apiUrl := config.GetString("mojang.api_base_url")
+	if apiUrl != "" {
+		u, err := url.ParseRequestURI(apiUrl)
+		if err != nil {
+			return err
+		}
+
+		mojang.ApiMojangDotComAddr = u.String()
+	}
+
+	sessionServerUrl := config.GetString("mojang.session_server_base_url")
+	if sessionServerUrl != "" {
+		u, err := url.ParseRequestURI(apiUrl)
+		if err != nil {
+			return err
+		}
+
+		mojang.SessionServerMojangComAddr = u.String()
+	}
+
+	return nil
+}
+
 func newMojangTexturesProviderFactory(
 	container *di.Container,
 	config *viper.Viper,