Fix comment permissions (#28213) (#28217)

backport #28213 

This PR will fix some missed checks for private repositories' data on
web routes and API routes.

routers/api/v1/user/app.go

@@ -337,6 +337,10 @@ func GetOauth2Application(ctx *context.APIContext) {
 		}
 		return
 	}
+	if app.UID != ctx.Doer.ID {
+		ctx.NotFound()
+		return
+	}
 
 	app.ClientSecret = ""
 

routers/api/v1/user/gpg_key.go

@@ -110,7 +110,7 @@ func GetGPGKey(ctx *context.APIContext) {
 	//   "404":
 	//     "$ref": "#/responses/notFound"
 
-	key, err := asymkey_model.GetGPGKeyByID(ctx.ParamsInt64(":id"))
+	key, err := asymkey_model.GetGPGKeyForUserByID(ctx.Doer.ID, ctx.ParamsInt64(":id"))
 	if err != nil {
 		if asymkey_model.IsErrGPGKeyNotExist(err) {
 			ctx.NotFound()

routers/api/v1/user/hook.go

@@ -62,6 +62,11 @@ func GetHook(ctx *context.APIContext) {
 		return
 	}
 
+	if !ctx.Doer.IsAdmin && hook.OwnerID != ctx.Doer.ID {
+		ctx.NotFound()
+		return
+	}
+
 	apiHook, err := webhook_service.ToHook(ctx.Doer.HomeLink(), hook)
 	if err != nil {
 		ctx.InternalServerError(err)