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Copy pathproxy.go
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78 lines (64 loc) · 1.97 KB
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Copy pathproxy.go
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78 lines (64 loc) · 1.97 KB
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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 (
"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
}
encodedURL := request.RouteStringParam(r, "encodedURL")
if encodedURL == "" {
html.BadRequest(w, r, errors.New("No URL provided"))
return
}
decodedURL, err := base64.URLEncoding.DecodeString(encodedURL)
if err != nil {
html.BadRequest(w, r, errors.New("Unable to decode this URL"))
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()
})
}