Cleanup image_fetcher::ImageFetcher

ios/chrome/browser/net/image_fetcher.mm

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/net/image_fetcher.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/bind.h"
-#include "base/compiler_specific.h"
 #include "base/location.h"
-#include "base/logging.h"
-#include "base/mac/scoped_block.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/task_runner_util.h"
+#include "base/mac/scoped_nsobject.h"
 #include "base/threading/sequenced_worker_pool.h"
+#include "ios/web/public/web_thread.h"
 #include "ios/web/public/webp_decoder.h"
 #include "net/base/load_flags.h"
 #include "net/http/http_response_headers.h"
 #include "net/url_request/url_fetcher.h"
-#include "url/gurl.h"
+#include "net/url_request/url_request_context_getter.h"
 
 namespace {
 
 class WebpDecoderDelegate : public web::WebpDecoder::Delegate {
  public:
   NSData* data() const { return decoded_image_; }
 
   // WebpDecoder::Delegate methods
   void OnFinishedDecoding(bool success) override {
     if (!success)
       decoded_image_.reset();
   }
   void SetImageFeatures(
       size_t total_size,
       web::WebpDecoder::DecodedImageFormat format) override {
     decoded_image_.reset([[NSMutableData alloc] initWithCapacity:total_size]);
   }
   void OnDataDecoded(NSData* data) override {
     DCHECK(decoded_image_);
     [decoded_image_ appendData:data];
   }
  private:
   ~WebpDecoderDelegate() override {}
   base::scoped_nsobject<NSMutableData> decoded_image_;
 };
 
+// Content-type header for WebP images.
+static const char kWEBPMimeType[] = "image/webp";
+
 // Returns a NSData object containing the decoded image.
 // Returns nil in case of failure.
 base::scoped_nsobject<NSData> DecodeWebpImage(
     const base::scoped_nsobject<NSData>& webp_image) {
   scoped_refptr<WebpDecoderDelegate> delegate(new WebpDecoderDelegate);
   scoped_refptr<web::WebpDecoder> decoder(new web::WebpDecoder(delegate.get()));
   decoder->OnDataReceived(webp_image);
   DLOG_IF(ERROR, !delegate->data()) << "WebP image decoding failed.";
   return base::scoped_nsobject<NSData>([delegate->data() retain]);
 }
 
 }  // namespace
 
 namespace image_fetcher {
 
 ImageFetcher::ImageFetcher(
-    const scoped_refptr<base::SequencedWorkerPool> decoding_pool)
+    const scoped_refptr<base::SequencedWorkerPool>& decoding_pool)
     : request_context_getter_(nullptr),
       weak_factory_(this),
       decoding_pool_(decoding_pool) {
   DCHECK(decoding_pool_.get());
 }
 
 ImageFetcher::~ImageFetcher() {
   // Delete all the entries in the |downloads_in_progress_| map.  This will in
   // turn cancel all of the requests.
-  for (std::map<const net::URLFetcher*, Callback>::iterator it =
-           downloads_in_progress_.begin();
-       it != downloads_in_progress_.end(); ++it) {
-    [it->second release];
-    delete it->first;
+  for (const auto& pair : downloads_in_progress_) {
+    [pair.second release];
+    delete pair.first;
   }
 }
 
 void ImageFetcher::StartDownload(
     const GURL& url,
-    Callback callback,
+    ImageFetchedCallback callback,
     const std::string& referrer,
     net::URLRequest::ReferrerPolicy referrer_policy) {
   DCHECK(request_context_getter_.get());
   net::URLFetcher* fetcher = net::URLFetcher::Create(url,
                                                      net::URLFetcher::GET,
                                                      this);
   downloads_in_progress_[fetcher] = [callback copy];
   fetcher->SetLoadFlags(
-      net::LOAD_DO_NOT_SEND_COOKIES | net::LOAD_DO_NOT_SAVE_COOKIES);
+      net::LOAD_DO_NOT_SEND_COOKIES | net::LOAD_DO_NOT_SAVE_COOKIES |
+      net::LOAD_DO_NOT_SEND_AUTH_DATA | net::LOAD_DO_NOT_PROMPT_FOR_LOGIN);
   fetcher->SetRequestContext(request_context_getter_.get());
   fetcher->SetReferrer(referrer);
   fetcher->SetReferrerPolicy(referrer_policy);
   fetcher->Start();
 }
 
-void ImageFetcher::StartDownload(const GURL& url, Callback callback) {
+void ImageFetcher::StartDownload(
+    const GURL& url, ImageFetchedCallback callback) {
   ImageFetcher::StartDownload(
-      url, callback, "", net::URLRequest::NEVER_CLEAR_REFERRER);
+      url, callback, std::string(), net::URLRequest::NEVER_CLEAR_REFERRER);
 }
 
 // Delegate callback that is called when URLFetcher completes.  If the image
 // was fetched successfully, creates a new NSData and returns it to the
 // callback, otherwise returns nil to the callback.
 void ImageFetcher::OnURLFetchComplete(const net::URLFetcher* fetcher) {
   if (downloads_in_progress_.find(fetcher) == downloads_in_progress_.end()) {
     LOG(ERROR) << "Received callback for unknown URLFetcher " << fetcher;
     return;
   }
 
-  // Ensures that |fetcher| will be deleted even if we return early.
+  // Ensures that |fetcher| will be deleted in the event of early return.
   scoped_ptr<const net::URLFetcher> fetcher_deleter(fetcher);
 
-  // Retrieves the callback and ensures that it will be deleted even if we
-  // return early.
-  base::mac::ScopedBlock<Callback> callback(downloads_in_progress_[fetcher]);
+  // Retrieves the callback and ensures that it will be deleted in the event
+  // of early return.
+  base::mac::ScopedBlock<ImageFetchedCallback> callback(
+      downloads_in_progress_[fetcher]);
 
   // Remove |fetcher| from the map.
   downloads_in_progress_.erase(fetcher);
 
   // Make sure the request was successful. For "data" requests, the response
   // code has no meaning, because there is no actual server (data is encoded
-  // directly in the URL). In that case, we set the response code to 200.
+  // directly in the URL). In that case, set the response code to 200 (OK).
   const GURL& original_url = fetcher->GetOriginalURL();
   const int http_response_code = original_url.SchemeIs("data") ?
       200 : fetcher->GetResponseCode();
   if (http_response_code != 200) {
     (callback.get())(original_url, http_response_code, nil);
     return;
   }
 
   std::string response;
   if (!fetcher->GetResponseAsString(&response)) {
     (callback.get())(original_url, http_response_code, nil);
     return;
   }
 
   // Create a NSData from the returned data and notify the callback.
   base::scoped_nsobject<NSData> data([[NSData alloc]
       initWithBytes:reinterpret_cast<const unsigned char*>(response.data())
              length:response.size()]);
 
   if (fetcher->GetResponseHeaders()) {
     std::string mime_type;
     fetcher->GetResponseHeaders()->GetMimeType(&mime_type);
-    if (mime_type == "image/webp") {
+    if (mime_type == kWEBPMimeType) {
       base::PostTaskAndReplyWithResult(decoding_pool_.get(),
                                        FROM_HERE,
                                        base::Bind(&DecodeWebpImage, data),
                                        base::Bind(&ImageFetcher::RunCallback,
                                                   weak_factory_.GetWeakPtr(),
                                                   callback,
                                                   original_url,
                                                   http_response_code));
       return;
     }
   }
   (callback.get())(original_url, http_response_code, data);
 }
 
-void ImageFetcher::RunCallback(const base::mac::ScopedBlock<Callback>& callback,
-                               const GURL& url,
-                               int http_response_code,
-                               NSData* data) {
+void ImageFetcher::RunCallback(
+    const base::mac::ScopedBlock<ImageFetchedCallback>& callback,
+    const GURL& url,
+    int http_response_code,
+    NSData* data) {
   (callback.get())(url, http_response_code, data);
 }
 
 void ImageFetcher::SetRequestContextGetter(
-    net::URLRequestContextGetter* request_context_getter) {
+    const scoped_refptr<net::URLRequestContextGetter>& request_context_getter) {
   request_context_getter_ = request_context_getter;
 }
 
 }  // namespace image_fetcher