59 lines
1.9 KiB
Go
59 lines
1.9 KiB
Go
package middleware
|
|
|
|
/*
|
|
* Copyright 2024 Jonas Kaninda
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
*/
|
|
import (
|
|
errorinterceptor "github.com/jkaninda/goma-gateway/pkg/error-interceptor"
|
|
"github.com/jkaninda/goma-gateway/pkg/logger"
|
|
"io"
|
|
"net/http"
|
|
)
|
|
|
|
// RouteErrorInterceptor contains backend status code errors to intercept
|
|
type RouteErrorInterceptor struct {
|
|
Origins []string
|
|
ErrorInterceptor errorinterceptor.ErrorInterceptor
|
|
}
|
|
|
|
// RouteErrorInterceptor Middleware intercepts backend route errors
|
|
func (intercept RouteErrorInterceptor) RouteErrorInterceptor(next http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
rec := newResponseRecorder(w)
|
|
next.ServeHTTP(rec, r)
|
|
if canInterceptError(rec.statusCode, intercept.ErrorInterceptor.Errors) {
|
|
logger.Debug("Backend error")
|
|
logger.Error("An error occurred from the backend with the status code: %d", rec.statusCode)
|
|
//Update Origin Cors Headers
|
|
if allowedOrigin(intercept.Origins, r.Header.Get("Origin")) {
|
|
w.Header().Set("Access-Control-Allow-Origin", r.Header.Get("Origin"))
|
|
}
|
|
RespondWithError(w, rec.statusCode, http.StatusText(rec.statusCode), intercept.ErrorInterceptor)
|
|
return
|
|
} else {
|
|
// No error: write buffered response to client
|
|
w.WriteHeader(rec.statusCode)
|
|
_, err := io.Copy(w, rec.body)
|
|
if err != nil {
|
|
return
|
|
}
|
|
return
|
|
|
|
}
|
|
|
|
})
|
|
}
|