[Downloads] Always call DM::StartDownload() for explicit downloads.

content/browser/download/download_resource_handler.cc

 // Copyright (c) 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.
 
 #include "content/browser/download/download_resource_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 65 matching lines @@
       tab_info->tab_referrer_url = entry->GetReferrer().url;
     }
   }
 }
 
 void DeleteOnUIThread(
     scoped_ptr<DownloadResourceHandler::DownloadTabInfo> tab_info) {}
 
 }  // namespace
 
-DownloadResourceHandler::DownloadResourceHandler(
-    uint32_t id,
-    net::URLRequest* request,
-    const DownloadUrlParameters::OnStartedCallback& started_cb,
-    scoped_ptr<DownloadSaveInfo> save_info)
+DownloadResourceHandler::DownloadResourceHandler(net::URLRequest* request)
     : ResourceHandler(request),
-      download_id_(id),
-      started_cb_(started_cb),
       tab_info_(new DownloadTabInfo()),
-      core_(request,
-            std::move(save_info),
-            base::Bind(&DownloadResourceHandler::OnCoreReadyToRead,
-                       base::Unretained(this))) {
+      core_(request, this) {
   // Do UI thread initialization for tab_info_ asap after
   // DownloadResourceHandler creation since the tab could be navigated
   // before StartOnUIThread gets called.  This is safe because deletion
   // will occur via PostTask() as well, which will serialized behind this
   // PostTask()
   const ResourceRequestInfoImpl* request_info = GetRequestInfo();
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&InitializeDownloadTabInfoOnUIThread,
                  DownloadRequestHandle(AsWeakPtr(), request_info->GetChildID(),
                                        request_info->GetRouteID(),
                                        request_info->GetRequestID(),
                                        request_info->frame_tree_node_id()),
                  tab_info_.get()));
 }
 
 DownloadResourceHandler::~DownloadResourceHandler() {
-  // This won't do anything if the callback was called before.
-  // If it goes through, it will likely be because OnWillStart() returned
-  // false somewhere in the chain of resource handlers.
-  CallStartedCB(DOWNLOAD_INTERRUPT_REASON_NETWORK_FAILED);
-
   if (tab_info_) {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&DeleteOnUIThread, base::Passed(&tab_info_)));
   }
 }
 
 bool DownloadResourceHandler::OnRequestRedirected(
     const net::RedirectInfo& redirect_info,
     ResourceResponse* response,
     bool* defer) {
   return true;
 }
 
 // Send the download creation information to the download thread.
 bool DownloadResourceHandler::OnResponseStarted(
     ResourceResponse* response,
     bool* defer) {
-  scoped_ptr<DownloadCreateInfo> create_info;
-  scoped_ptr<ByteStreamReader> stream_reader;
-
-  core_.OnResponseStarted(&create_info, &stream_reader);
-
-  const ResourceRequestInfoImpl* request_info = GetRequestInfo();
-  create_info->download_id = download_id_;
-  create_info->has_user_gesture = request_info->HasUserGesture();
-  create_info->transition_type = request_info->GetPageTransition();
-  create_info->request_handle.reset(new DownloadRequestHandle(
-      AsWeakPtr(), request_info->GetChildID(), request_info->GetRouteID(),
-      request_info->GetRequestID(), request_info->frame_tree_node_id()));
-
   // The MIME type in ResourceResponse is the product of
   // MimeTypeResourceHandler.
-  create_info->mime_type = response->head.mime_type;
-
-  BrowserThread::PostTask(
-      BrowserThread::UI, FROM_HERE,
-      base::Bind(&StartOnUIThread, base::Passed(&create_info),
-                 base::Passed(&tab_info_), base::Passed(&stream_reader),
-                 base::ResetAndReturn(&started_cb_)));
-  return true;
-}
-
-void DownloadResourceHandler::CallStartedCB(
-    DownloadInterruptReason interrupt_reason) {
-  DCHECK_CURRENTLY_ON(BrowserThread::IO);
-  if (started_cb_.is_null())
-    return;
-  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
-                          base::Bind(base::ResetAndReturn(&started_cb_),
-                                     nullptr, interrupt_reason));
+  original_mime_type_ = response->head.mime_type;
+  return core_.OnResponseStarted();
 }
 
 bool DownloadResourceHandler::OnWillStart(const GURL& url, bool* defer) {
   return true;
 }
 
 bool DownloadResourceHandler::OnBeforeNetworkStart(const GURL& url,
                                                    bool* defer) {
   return true;
 }
 
 // Create a new buffer, which will be handed to the download thread for file
 // writing and deletion.
 bool DownloadResourceHandler::OnWillRead(scoped_refptr<net::IOBuffer>* buf,
                                          int* buf_size,
                                          int min_size) {
   return core_.OnWillRead(buf, buf_size, min_size);
 }
 
 // Pass the buffer to the download file writer.
 bool DownloadResourceHandler::OnReadCompleted(int bytes_read, bool* defer) {
   return core_.OnReadCompleted(bytes_read, defer);
 }
 
 void DownloadResourceHandler::OnResponseCompleted(
     const net::URLRequestStatus& status,
     const std::string& security_info,
     bool* defer) {
-  DownloadInterruptReason result = core_.OnResponseCompleted(status);
-  CallStartedCB(result);
+  core_.OnResponseCompleted(status);
 }
 
 void DownloadResourceHandler::OnDataDownloaded(int bytes_downloaded) {
   NOTREACHED();
 }
 
 void DownloadResourceHandler::PauseRequest() {
   core_.PauseRequest();
 }
 
 void DownloadResourceHandler::ResumeRequest() {
   core_.ResumeRequest();
 }
 
-void DownloadResourceHandler::OnCoreReadyToRead() {
+void DownloadResourceHandler::OnStart(
+    scoped_ptr<DownloadCreateInfo> create_info,
+    scoped_ptr<ByteStreamReader> stream_reader,
+    const DownloadUrlParameters::OnStartedCallback& callback) {
+  // If the user cancels the download, then don't call start. Instead ignore the
+  // download entirely.
+  if (create_info->result == DOWNLOAD_INTERRUPT_REASON_USER_CANCELED &&
+      create_info->download_id == DownloadItem::kInvalidId) {
+    if (!callback.is_null())
+      BrowserThread::PostTask(
+          BrowserThread::UI, FROM_HERE,
+          base::Bind(callback, nullptr, create_info->result));
+    return;
+  }
+
+  const ResourceRequestInfoImpl* request_info = GetRequestInfo();
+  create_info->has_user_gesture = request_info->HasUserGesture();
+  create_info->transition_type = request_info->GetPageTransition();
+
+  create_info->request_handle.reset(new DownloadRequestHandle(
+      AsWeakPtr(), request_info->GetChildID(), request_info->GetRouteID(),
+      request_info->GetRequestID(), request_info->frame_tree_node_id()));
+
+  if (create_info->result == DOWNLOAD_INTERRUPT_REASON_NONE)
+    create_info->mime_type = original_mime_type_;
+
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(&StartOnUIThread, base::Passed(&create_info),
+                 base::Passed(&tab_info_), base::Passed(&stream_reader),
+                 callback));
+}
+
+void DownloadResourceHandler::OnReadyToRead() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   controller()->Resume();
 }
 
 void DownloadResourceHandler::CancelRequest() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   const ResourceRequestInfoImpl* info = GetRequestInfo();
   ResourceDispatcherHostImpl::Get()->CancelRequest(
       info->GetChildID(),
@@ skipping 13 matching lines @@
                             " }",
                             request() ?
                                 request()->url().spec().c_str() :
                                 "<NULL request>",
                             info->GetChildID(),
                             info->GetRequestID(),
                             info->GetRouteID());
 }
 
 }  // namespace content