package router import ( "io" "net/http" "strings" "emperror.dev/errors" "github.com/gin-gonic/gin" "github.com/google/uuid" "github.com/pterodactyl/wings/config" "github.com/pterodactyl/wings/server" ) type Middleware struct{} // A custom handler function allowing for errors bubbled up by c.Error() to be returned in a // standardized format with tracking UUIDs on them for easier log searching. func (m *Middleware) ErrorHandler() gin.HandlerFunc { return func(c *gin.Context) { c.Next() err := c.Errors.Last() if err == nil || err.Err == nil { return } tracked := NewTrackedError(err.Err) // If there is a server in the context for this request pull it out so that we can // track the error specifically for that server. if s, ok := c.Get("server"); ok { tracked = NewServerError(err.Err, s.(*server.Server)) } // This error occurs if you submit invalid JSON data to an endpoint. if err.Err.Error() == io.EOF.Error() { c.JSON(c.Writer.Status(), gin.H{"error": "A JSON formatted body is required for this endpoint."}) return } tracked.Abort(c) return } } // Set the access request control headers on all of the requests. func (m *Middleware) SetAccessControlHeaders() gin.HandlerFunc { origins := config.Get().AllowedOrigins location := config.Get().PanelLocation return func(c *gin.Context) { c.Header("Access-Control-Allow-Credentials", "true") c.Header("Access-Control-Allow-Methods", "GET, POST, PATCH, PUT, DELETE, OPTIONS") c.Header("Access-Control-Allow-Headers", "Accept, Accept-Encoding, Authorization, Cache-Control, Content-Type, Content-Length, Origin, X-Real-IP, X-CSRF-Token") o := c.GetHeader("Origin") if o != location { for _, origin := range origins { if origin != "*" && o != origin { continue } c.Header("Access-Control-Allow-Origin", origin) c.Next() return } } c.Header("Access-Control-Allow-Origin", location) c.Next() } } // Authenticates the request token against the given permission string, ensuring that // if it is a server permission, the token has control over that server. If it is a global // token, this will ensure that the request is using a properly signed global token. func (m *Middleware) RequireAuthorization() gin.HandlerFunc { token := config.Get().AuthenticationToken return func(c *gin.Context) { auth := strings.SplitN(c.GetHeader("Authorization"), " ", 2) if len(auth) != 2 || auth[0] != "Bearer" { c.Header("WWW-Authenticate", "Bearer") c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{ "error": "The required authorization heads were not present in the request.", }) return } // All requests to Wings must be authorized with the authentication token present in // the Wings configuration file. Remeber, all requests to Wings come from the Panel // backend, or using a signed JWT for temporary authentication. if auth[1] == token { c.Next() return } c.AbortWithStatusJSON(http.StatusForbidden, gin.H{ "error": "You are not authorized to access this endpoint.", }) } } // Helper function to fetch a server out of the servers collection stored in memory. // // This function should not be used in new controllers, prefer ExtractServer where // possible. func GetServer(uuid string) *server.Server { return server.GetServers().Find(func(s *server.Server) bool { return uuid == s.Id() }) } // Ensure that the requested server exists in this setup. Returns a 404 if we cannot // locate it. func (m *Middleware) ServerExists() gin.HandlerFunc { return func(c *gin.Context) { u, err := uuid.Parse(c.Param("server")) if err == nil { if s := GetServer(u.String()); s != nil { c.Set("server", s) c.Next() return } } c.AbortWithStatusJSON(http.StatusNotFound, gin.H{ "error": "The resource you requested does not exist.", }) } } // Returns the server instance from the gin context. If there is no server set in the // context (e.g. calling from a controller not protected by ServerExists) this function // will panic. func ExtractServer(c *gin.Context) *server.Server { if s, ok := c.Get("server"); ok { return s.(*server.Server) } panic(errors.New("cannot extract server, missing on gin context")) }