app_list: DriveAppConverter to install local URL app from DriveAppInfo.

chrome/browser/ui/app_list/drive/drive_app_converter.cc

+// Copyright 2014 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 "chrome/browser/ui/app_list/drive/drive_app_converter.h"
+
+#include <algorithm>
+#include <set>
+
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/extensions/crx_installer.h"
+#include "chrome/browser/extensions/install_tracker.h"
+#include "chrome/browser/image_decoder.h"
+#include "chrome/browser/profiles/profile.h"
+#include "content/public/browser/browser_thread.h"
+#include "extensions/browser/extension_system.h"
+#include "extensions/common/constants.h"
+#include "net/base/load_flags.h"
+#include "net/http/http_status_code.h"
+#include "net/url_request/url_fetcher.h"
+#include "net/url_request/url_fetcher_delegate.h"
+#include "net/url_request/url_request_status.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+using content::BrowserThread;
+
+// IconFetcher downloads |icon_url| using |converter|'s profile. The icon
+// url is passed from a DriveAppInfo and should follow icon url definition
+// in Drive API:
+//   https://developers.google.com/drive/v2/reference/apps#resource
+// Each icon url represents a single image associated with a certain size.
+class DriveAppConverter::IconFetcher : public net::URLFetcherDelegate,
+                                       public ImageDecoder::Delegate {
+ public:
+  IconFetcher(DriveAppConverter* converter,
+              const GURL& icon_url,
+              int expected_size)
+      : converter_(converter),
+        icon_url_(icon_url),
+        expected_size_(expected_size) {}
+  virtual ~IconFetcher() {
+    if (image_decoder_.get())
+      image_decoder_->set_delegate(NULL);
+  }
+
+  void Start() {
+    fetcher_.reset(
+        net::URLFetcher::Create(icon_url_, net::URLFetcher::GET, this));
+    fetcher_->SetRequestContext(converter_->profile_->GetRequestContext());
+    fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SAVE_COOKIES);
+    fetcher_->Start();
+  }
+
+  const GURL& icon_url() const { return icon_url_; }
+  const SkBitmap& icon() const { return icon_; }
+
+ private:
+  // net::URLFetcherDelegate overrides:
+  virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE {
+    CHECK_EQ(fetcher_.get(), source);
+    scoped_ptr<net::URLFetcher> fetcher(fetcher_.Pass());
+
+    if (!fetcher->GetStatus().is_success() ||
+        fetcher->GetResponseCode() != net::HTTP_OK) {
+      converter_->OnIconFetchComplete(this);
+      return;
+    }
+
+    std::string unsafe_icon_data;
+    fetcher->GetResponseAsString(&unsafe_icon_data);
+
+    image_decoder_ =
+        new ImageDecoder(this, unsafe_icon_data, ImageDecoder::DEFAULT_CODEC);
+    image_decoder_->Start(
+        BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI));
+  }
+
+  // ImageDecoder::Delegate overrides:
+  virtual void OnImageDecoded(const ImageDecoder* decoder,
+                              const SkBitmap& decoded_image) OVERRIDE {
+    if (decoded_image.width() == expected_size_)
+      icon_ = decoded_image;
+    converter_->OnIconFetchComplete(this);
+  }
+
+  virtual void OnDecodeImageFailed(const ImageDecoder* decoder) OVERRIDE {
+    converter_->OnIconFetchComplete(this);
+  }
+
+  DriveAppConverter* converter_;
+  const GURL icon_url_;
+  const int expected_size_;
+
+  scoped_ptr<net::URLFetcher> fetcher_;
+  scoped_refptr<ImageDecoder> image_decoder_;
+  SkBitmap icon_;
+
+  DISALLOW_COPY_AND_ASSIGN(IconFetcher);
+};
+
+DriveAppConverter::DriveAppConverter(Profile* profile,
+                                     const drive::DriveAppInfo& app_info,
+                                     const FinishedCallback& finished_callback)
+    : profile_(profile),
+      app_info_(app_info),
+      app_(NULL),
+      finished_callback_(finished_callback) {
+  DCHECK(profile_);
+}
+
+DriveAppConverter::~DriveAppConverter() {
+  PostInstallCleanUp();
+}
+
+void DriveAppConverter::Start() {
+  if (app_info_.app_name.empty() ||
+      !app_info_.create_url.is_valid()) {
+    finished_callback_.Run(this, false);
+    return;
+  }
+
+  web_app_.title = base::UTF8ToUTF16(app_info_.app_name);
+  web_app_.app_url = app_info_.create_url;
+
+  const std::set<int> allowed_sizes(extension_misc::kExtensionIconSizes,
+                                    extension_misc::kExtensionIconSizes +
+                                        extension_misc::kNumExtensionIconSizes);
+  std::set<int> pending_sizes;
+  for (size_t i = 0; i < app_info_.app_icons.size(); ++i) {
+    const int icon_size = app_info_.app_icons[i].first;
+    if (allowed_sizes.find(icon_size) == allowed_sizes.end() ||
+        pending_sizes.find(icon_size) != pending_sizes.end()) {
+      continue;
+    }
+
+    pending_sizes.insert(icon_size);
+    const GURL& icon_url = app_info_.app_icons[i].second;
+    IconFetcher* fetcher = new IconFetcher(this, icon_url, icon_size);
+    fetchers_.push_back(fetcher);  // Pass ownership to |fetchers|.
+    fetcher->Start();
+  }
+
+  if (fetchers_.empty())
+    StartInstall();
+}
+
+void DriveAppConverter::OnIconFetchComplete(const IconFetcher* fetcher) {
+  const SkBitmap& icon = fetcher->icon();
+  if (!icon.empty() && icon.width() != 0) {
+    WebApplicationInfo::IconInfo icon_info;
+    icon_info.url = fetcher->icon_url();
+    icon_info.data = icon;
+    icon_info.width = icon.width();
+    icon_info.height = icon.height();
+    web_app_.icons.push_back(icon_info);
+  }
+
+  fetchers_.erase(std::find(fetchers_.begin(), fetchers_.end(), fetcher));
+
+  if (fetchers_.empty())
+    StartInstall();
+}
+
+void DriveAppConverter::StartInstall() {
+  DCHECK(!crx_installer_);
+  crx_installer_ = extensions::CrxInstaller::CreateSilent(
+      extensions::ExtensionSystem::Get(profile_)->extension_service());
+  extensions::InstallTracker::Get(profile_)->AddObserver(this);
+  crx_installer_->InstallWebApp(web_app_);
+}
+
+void DriveAppConverter::PostInstallCleanUp() {
+  if (!crx_installer_)
+    return;
+
+  extensions::InstallTracker::Get(profile_)->RemoveObserver(this);
+  crx_installer_ = NULL;
+}
+
+void DriveAppConverter::OnFinishCrxInstall(const std::string& extension_id,
+                                           bool success) {
+  if (!crx_installer_->extension() ||
+      crx_installer_->extension()->id() != extension_id) {
+    return;
+  }
+
+  app_ = crx_installer_->extension();
+  finished_callback_.Run(this, success);
+
+  PostInstallCleanUp();
+}