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v2/ui/proxy.go /
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| // Copyright 2017 Frédéric Guillot. All rights reserved. | |
| // Use of this source code is governed by the Apache 2.0 | |
| // license that can be found in the LICENSE file. | |
| package ui // import "miniflux.app/ui" | |
| import ( | |
| "crypto/hmac" | |
| "crypto/sha256" | |
| "encoding/base64" | |
| "errors" | |
| "net/http" | |
| "time" | |
| "miniflux.app/config" | |
| "miniflux.app/crypto" | |
| "miniflux.app/http/request" | |
| "miniflux.app/http/response" | |
| "miniflux.app/http/response/html" | |
| "miniflux.app/logger" | |
| ) | |
| func (h *handler) imageProxy(w http.ResponseWriter, r *http.Request) { | |
| // If we receive a "If-None-Match" header, we assume the image is already stored in browser cache. | |
| if r.Header.Get("If-None-Match") != "" { | |
| w.WriteHeader(http.StatusNotModified) | |
| return | |
| } | |
| encodedDigest := request.RouteStringParam(r, "encodedDigest") | |
| encodedURL := request.RouteStringParam(r, "encodedURL") | |
| if encodedURL == "" { | |
| html.BadRequest(w, r, errors.New("No URL provided")) | |
| return | |
| } | |
| decodedDigest, err := base64.URLEncoding.DecodeString(encodedDigest) | |
| if err != nil { | |
| html.BadRequest(w, r, errors.New("Unable to decode this Digest")) | |
| return | |
| } | |
| decodedURL, err := base64.URLEncoding.DecodeString(encodedURL) | |
| if err != nil { | |
| html.BadRequest(w, r, errors.New("Unable to decode this URL")) | |
| return | |
| } | |
| mac := hmac.New(sha256.New, config.Opts.ProxyPrivateKey()) | |
| mac.Write(decodedURL) | |
| expectedMAC := mac.Sum(nil) | |
| if !hmac.Equal(decodedDigest, expectedMAC) { | |
| html.Forbidden(w, r) | |
| return | |
| } | |
| imageURL := string(decodedURL) | |
| logger.Debug(`[Proxy] Fetching %q`, imageURL) | |
| req, err := http.NewRequest("GET", imageURL, nil) | |
| if err != nil { | |
| html.ServerError(w, r, err) | |
| return | |
| } | |
| // Note: User-Agent HTTP header is omitted to avoid being blocked by bot protection mechanisms. | |
| req.Header.Add("Connection", "close") | |
| clt := &http.Client{ | |
| Timeout: time.Duration(config.Opts.HTTPClientTimeout()) * time.Second, | |
| } | |
| resp, err := clt.Do(req) | |
| if err != nil { | |
| html.ServerError(w, r, err) | |
| return | |
| } | |
| defer resp.Body.Close() | |
| if resp.StatusCode != http.StatusOK { | |
| logger.Error(`[Proxy] Status Code is %d for URL %q`, resp.StatusCode, imageURL) | |
| html.NotFound(w, r) | |
| return | |
| } | |
| etag := crypto.HashFromBytes(decodedURL) | |
| response.New(w, r).WithCaching(etag, 72*time.Hour, func(b *response.Builder) { | |
| b.WithHeader("Content-Security-Policy", `default-src 'self'`) | |
| b.WithHeader("Content-Type", resp.Header.Get("Content-Type")) | |
| b.WithBody(resp.Body) | |
| b.WithoutCompression() | |
| b.Write() | |
| }) | |
| } |