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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "net/http" | ||
| "os" | ||
|
|
||
| "github.com/dgrijalva/jwt-go" | ||
| "github.com/gin-gonic/gin" | ||
| "github.com/markbates/goth" | ||
| "github.com/markbates/goth/gothic" | ||
| "github.com/markbates/goth/providers/discord" | ||
| ) | ||
|
|
||
| const ( | ||
| WebTokenCookieName = "mnbcontrol_webtoken" | ||
| ) | ||
|
|
||
| func AuthSetup(callbackURL string) { | ||
| goth.UseProviders( | ||
| discord.New( | ||
| os.Getenv("DISCORD_KEY"), | ||
| os.Getenv("DISCORD_SECRET"), | ||
| callbackURL, | ||
| discord.ScopeIdentify, | ||
| ), | ||
| ) | ||
| } | ||
|
|
||
| func AuthLogin(ctx *gin.Context) { | ||
| // try to get the user without re-authenticating | ||
| if user, err := gothic.CompleteUserAuth(ctx.Writer, ctx.Request); err == nil { | ||
| ctx.JSON(http.StatusOK, user) | ||
| return | ||
| } | ||
| gothic.BeginAuthHandler(ctx.Writer, ctx.Request) | ||
| } | ||
|
|
||
| func AuthCallback(ctx *gin.Context) { | ||
| user, err := gothic.CompleteUserAuth(ctx.Writer, ctx.Request) | ||
| if err != nil { | ||
| ctx.AbortWithStatusJSON(http.StatusInternalServerError, APIError{ | ||
| fmt.Errorf("auth callback failed: %s", err).Error(), | ||
| }) | ||
| return | ||
| } | ||
|
|
||
| token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{ | ||
| "userID": user.UserID, | ||
| }) | ||
| tokenString, err := token.SignedString([]byte(os.Getenv("JWT_SIGNING_KEY"))) | ||
| if err != nil { | ||
| ctx.AbortWithStatusJSON(http.StatusInternalServerError, APIError{ | ||
| fmt.Errorf("failed to sign token: %s", err).Error(), | ||
| }) | ||
| return | ||
| } | ||
| ctx.SetCookie(WebTokenCookieName, tokenString, 86400, "/", "", false, true) | ||
| ctx.Status(http.StatusOK) | ||
| } | ||
|
|
||
| func AuthLogout(ctx *gin.Context) { | ||
| err := gothic.Logout(ctx.Writer, ctx.Request) | ||
| if err != nil { | ||
| ctx.AbortWithStatusJSON(http.StatusInternalServerError, APIError{ | ||
| fmt.Errorf("failed to logout: %s", err).Error(), | ||
| }) | ||
| return | ||
| } | ||
| ctx.Redirect(http.StatusTemporaryRedirect, "/") | ||
| } | ||
|
|
||
| func (control *Control) Authorize() gin.HandlerFunc { | ||
| return func(ctx *gin.Context) { | ||
| authCookie, err := ctx.Request.Cookie(WebTokenCookieName) | ||
| if err != nil { | ||
| ctx.AbortWithStatusJSON(http.StatusUnauthorized, APIError{ | ||
| errors.New("unauthorized: missing auth").Error(), | ||
| }) | ||
| return | ||
| } | ||
|
|
||
| token, err := jwt.Parse(authCookie.Value, func(token *jwt.Token) (interface{}, error) { | ||
| if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok { | ||
| return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"]) | ||
| } | ||
| return []byte(os.Getenv("JWT_SIGNING_KEY")), nil | ||
| }) | ||
| if err != nil { | ||
| ctx.AbortWithStatusJSON(http.StatusUnauthorized, APIError{ | ||
| errors.New("unauthorized: failed to parse token").Error(), | ||
| }) | ||
| return | ||
| } | ||
| if !token.Valid { | ||
| ctx.AbortWithStatusJSON(http.StatusUnauthorized, APIError{ | ||
| errors.New("unauthorized: token is invalid").Error(), | ||
| }) | ||
| return | ||
| } | ||
| if err = token.Claims.Valid(); err != nil { | ||
| ctx.AbortWithStatusJSON(http.StatusUnauthorized, APIError{ | ||
| errors.New("unauthorized: token claims are invalid").Error(), | ||
| }) | ||
| return | ||
| } | ||
| claims, ok := token.Claims.(jwt.MapClaims) | ||
| if !ok { | ||
| ctx.AbortWithStatusJSON(http.StatusUnauthorized, APIError{ | ||
| errors.New("unauthorized: unexpected token claims").Error(), | ||
| }) | ||
| return | ||
| } | ||
|
|
||
| member, err := control.discordSession.GuildMember(*discordGuildID, fmt.Sprint(claims["userID"])) | ||
| if err != nil { | ||
| ctx.AbortWithStatusJSON(http.StatusForbidden, APIError{ | ||
| fmt.Errorf("forbidden: no guild membership: %s", err).Error(), | ||
| }) | ||
| return | ||
| } | ||
| var hasAccess bool | ||
| for _, role := range member.Roles { | ||
| if role == *discordRoleID { | ||
| hasAccess = true | ||
| break | ||
| } | ||
| } | ||
| if !hasAccess { | ||
| ctx.AbortWithStatusJSON(http.StatusForbidden, APIError{ | ||
| fmt.Errorf("forbidden: permission check failed: %s", err).Error(), | ||
| }) | ||
| return | ||
| } | ||
|
|
||
| ctx.Next() | ||
| } | ||
| } |
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