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