Refactor packages to have more idiomatic code base

ui/proxy.go

@@ -0,0 +1,56 @@
+// 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 (
+	"encoding/base64"
+	"errors"
+	"io/ioutil"
+	"time"
+
+	"github.com/miniflux/miniflux/crypto"
+	"github.com/miniflux/miniflux/http"
+	"github.com/miniflux/miniflux/http/handler"
+	"github.com/miniflux/miniflux/logger"
+)
+
+// ImageProxy fetch an image from a remote server and sent it back to the browser.
+func (c *Controller) ImageProxy(ctx *handler.Context, request *handler.Request, response *handler.Response) {
+	// If we receive a "If-None-Match" header we assume the image in stored in browser cache
+	if request.Request().Header.Get("If-None-Match") != "" {
+		response.NotModified()
+		return
+	}
+
+	encodedURL := request.StringParam("encodedURL", "")
+	if encodedURL == "" {
+		response.HTML().BadRequest(errors.New("No URL provided"))
+		return
+	}
+
+	decodedURL, err := base64.URLEncoding.DecodeString(encodedURL)
+	if err != nil {
+		response.HTML().BadRequest(errors.New("Unable to decode this URL"))
+		return
+	}
+
+	client := http.NewClient(string(decodedURL))
+	resp, err := client.Get()
+	if err != nil {
+		logger.Error("[Controller:ImageProxy] %v", err)
+		response.HTML().NotFound()
+		return
+	}
+
+	if resp.HasServerFailure() {
+		response.HTML().NotFound()
+		return
+	}
+
+	body, _ := ioutil.ReadAll(resp.Body)
+	etag := crypto.HashFromBytes(body)
+
+	response.Cache(resp.ContentType, etag, body, 72*time.Hour)
+}