chrly/api/mojang/mojang.go
2021-03-03 01:23:34 +01:00

226 lines
5.0 KiB
Go

package mojang
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"strings"
"sync"
"time"
)
var HttpClient = &http.Client{
Timeout: 10 * time.Second,
Transport: &http.Transport{
MaxIdleConnsPerHost: 1024,
},
}
type SignedTexturesResponse struct {
Id string `json:"id"`
Name string `json:"name"`
Props []*Property `json:"properties"`
once sync.Once
decodedTextures *TexturesProp
decodedErr error
}
func (t *SignedTexturesResponse) DecodeTextures() (*TexturesProp, error) {
t.once.Do(func() {
var texturesProp string
for _, prop := range t.Props {
if prop.Name == "textures" {
texturesProp = prop.Value
break
}
}
if texturesProp == "" {
return
}
decodedTextures, err := DecodeTextures(texturesProp)
if err != nil {
t.decodedErr = err
} else {
t.decodedTextures = decodedTextures
}
})
return t.decodedTextures, t.decodedErr
}
type Property struct {
Name string `json:"name"`
Signature string `json:"signature,omitempty"`
Value string `json:"value"`
}
type ProfileInfo struct {
Id string `json:"id"`
Name string `json:"name"`
IsLegacy bool `json:"legacy,omitempty"`
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, err := http.NewRequest("POST", ApiMojangDotComAddr+"/profiles/minecraft", bytes.NewBuffer(requestBody))
if err != nil {
return nil, err
}
request.Header.Set("Content-Type", "application/json")
response, err := HttpClient.Do(request)
if err != nil {
return nil, err
}
defer response.Body.Close()
if responseErr := validateResponse(response); responseErr != nil {
return nil, responseErr
}
var result []*ProfileInfo
body, _ := ioutil.ReadAll(response.Body)
_ = json.Unmarshal(body, &result)
return result, nil
}
// Obtains textures information for provided uuid
// 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 := SessionServerMojangComAddr + "/session/minecraft/profile/" + normalizedUuid
if signed {
url += "?unsigned=false"
}
request, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
response, err := HttpClient.Do(request)
if err != nil {
return nil, err
}
defer response.Body.Close()
if responseErr := validateResponse(response); responseErr != nil {
return nil, responseErr
}
var result *SignedTexturesResponse
body, _ := ioutil.ReadAll(response.Body)
_ = json.Unmarshal(body, &result)
return result, nil
}
func validateResponse(response *http.Response) error {
switch {
case response.StatusCode == 204:
return &EmptyResponse{}
case response.StatusCode == 400:
type errorResponse struct {
Error string `json:"error"`
Message string `json:"errorMessage"`
}
var decodedError *errorResponse
body, _ := ioutil.ReadAll(response.Body)
_ = json.Unmarshal(body, &decodedError)
return &BadRequestError{ErrorType: decodedError.Error, Message: decodedError.Message}
case response.StatusCode == 403:
return &ForbiddenError{}
case response.StatusCode == 429:
return &TooManyRequestsError{}
case response.StatusCode >= 500:
return &ServerError{Status: response.StatusCode}
}
return nil
}
type ResponseError interface {
IsMojangError() bool
}
// Mojang API doesn't return a 404 Not Found error for non-existent data identifiers
// Instead, they return 204 with an empty body
type EmptyResponse struct {
}
func (*EmptyResponse) Error() string {
return "204: Empty Response"
}
func (*EmptyResponse) IsMojangError() bool {
return true
}
// When passed request params are invalid, Mojang returns 400 Bad Request error
type BadRequestError struct {
ResponseError
ErrorType string
Message string
}
func (e *BadRequestError) Error() string {
return fmt.Sprintf("400 %s: %s", e.ErrorType, e.Message)
}
func (*BadRequestError) IsMojangError() bool {
return true
}
// When Mojang decides you're such a bad guy, this error appears (even if the request has no authorization)
type ForbiddenError struct {
ResponseError
}
func (*ForbiddenError) Error() string {
return "403: Forbidden"
}
// When you exceed the set limit of requests, this error will be returned
type TooManyRequestsError struct {
ResponseError
}
func (*TooManyRequestsError) Error() string {
return "429: Too Many Requests"
}
func (*TooManyRequestsError) IsMojangError() bool {
return true
}
// ServerError happens when Mojang's API returns any response with 50* status
type ServerError struct {
ResponseError
Status int
}
func (e *ServerError) Error() string {
return fmt.Sprintf("%d: %s", e.Status, "Server error")
}
func (*ServerError) IsMojangError() bool {
return true
}