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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,10 +1,12 @@ | ||
| package config | ||
|
|
||
| var ( | ||
| ApiVersion string | ||
| Port int | ||
| Bind string | ||
| Dev bool | ||
| ModulesDir string | ||
| Backend string | ||
| ApiVersion string | ||
| Port int | ||
| Bind string | ||
| Dev bool | ||
| ModulesDir string | ||
| Backend string | ||
| CORSOrigins string | ||
| FallbackProxyUrl string | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| package middleware | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "io" | ||
| "net/http" | ||
| "net/url" | ||
|
|
||
| "github.com/dadav/gorge/internal/log" | ||
| ) | ||
|
|
||
| // capturedResponseWriter is a custom response writer that captures the response status | ||
| type capturedResponseWriter struct { | ||
| http.ResponseWriter | ||
| body []byte | ||
| status int | ||
| } | ||
|
|
||
| func (w *capturedResponseWriter) WriteHeader(code int) { | ||
| w.status = code | ||
| } | ||
|
|
||
| func (w *capturedResponseWriter) Write(body []byte) (int, error) { | ||
| w.body = body | ||
| return len(body), nil | ||
| } | ||
|
|
||
| func (w *capturedResponseWriter) sendOriginalResponse() { | ||
| w.ResponseWriter.WriteHeader(w.status) | ||
| w.ResponseWriter.Write(w.body) | ||
| } | ||
|
|
||
| func ProxyFallback(upstreamHost string) func(next http.Handler) http.Handler { | ||
| return func(next http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| // capture response | ||
| capturedResponseWriter := &capturedResponseWriter{ResponseWriter: w} | ||
| next.ServeHTTP(capturedResponseWriter, r) | ||
|
|
||
| if capturedResponseWriter.status == http.StatusNotFound { | ||
| log.Log.Infof("Forwarding request to %s\n", upstreamHost) | ||
| forwardRequest(w, r, upstreamHost) | ||
| return | ||
| } | ||
|
|
||
| // If the response status is not 404, serve the original response | ||
| capturedResponseWriter.sendOriginalResponse() | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| func forwardRequest(w http.ResponseWriter, r *http.Request, forwardHost string) { | ||
| // Create a buffer to store the request body | ||
| var requestBodyBytes []byte | ||
| if r.Body != nil { | ||
| requestBodyBytes, _ = io.ReadAll(r.Body) | ||
| } | ||
|
|
||
| // Clone the original request | ||
| forwardUrl, err := url.JoinPath(forwardHost, r.URL.Path) | ||
| if err != nil { | ||
| http.Error(w, "Failed to create forwarded request", http.StatusInternalServerError) | ||
| return | ||
| } | ||
|
|
||
| forwardedRequest, err := http.NewRequest(r.Method, forwardUrl, bytes.NewBuffer(requestBodyBytes)) | ||
| if err != nil { | ||
| http.Error(w, "Failed to create forwarded request", http.StatusInternalServerError) | ||
| return | ||
| } | ||
|
|
||
| // Copy headers from the original request | ||
| forwardedRequest.Header = make(http.Header) | ||
| for key, values := range r.Header { | ||
| for _, value := range values { | ||
| forwardedRequest.Header.Add(key, value) | ||
| } | ||
| } | ||
|
|
||
| // Make the request to the forward host | ||
| // TODO: Add caching | ||
| client := http.Client{} | ||
| resp, err := client.Do(forwardedRequest) | ||
| if err != nil { | ||
| http.Error(w, "Failed to forward request", http.StatusInternalServerError) | ||
| return | ||
| } | ||
| defer resp.Body.Close() | ||
|
|
||
| // Copy the response headers | ||
| for key, values := range resp.Header { | ||
| for _, value := range values { | ||
| w.Header().Add(key, value) | ||
| } | ||
| } | ||
|
|
||
| // Write the response status code | ||
| w.WriteHeader(resp.StatusCode) | ||
|
|
||
| // Write the response body | ||
| body, err := io.ReadAll(resp.Body) | ||
| if err != nil { | ||
| http.Error(w, "Failed to read response body", http.StatusInternalServerError) | ||
| return | ||
| } | ||
| w.Write(body) | ||
| } |