chrome/browser/extensions/convert_web_app.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/extensions/convert_web_app.h"
   6
   7 #include <cmath>
   8 #include <limits>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/base64.h"
  13 #include "base/files/file_path.h"
  14 #include "base/files/file_util.h"
  15 #include "base/files/scoped_temp_dir.h"
  16 #include "base/json/json_file_value_serializer.h"
  17 #include "base/logging.h"
  18 #include "base/numerics/safe_conversions.h"
  19 #include "base/strings/stringprintf.h"
  20 #include "base/strings/utf_string_conversions.h"
  21 #include "base/time/time.h"
  22 #include "chrome/common/chrome_paths.h"
  23 #include "chrome/common/web_application_info.h"
  24 #include "crypto/sha2.h"
  25 #include "extensions/common/constants.h"
  26 #include "extensions/common/extension.h"
  27 #include "extensions/common/file_util.h"
  28 #include "extensions/common/image_util.h"
  29 #include "extensions/common/manifest_constants.h"
  30 #include "third_party/skia/include/core/SkBitmap.h"
  31 #include "ui/gfx/codec/png_codec.h"
  32 #include "url/gurl.h"
  33
  34 namespace extensions {
  35
  36 namespace keys = manifest_keys;
  37
  38 using base::Time;
  39
  40 namespace {
  41
  42 const char kIconsDirName[] = "icons";
  43
  44 // Create the public key for the converted web app.
  45 //
  46 // Web apps are not signed, but the public key for an extension doubles as
  47 // its unique identity, and we need one of those. A web app's unique identity
  48 // is its manifest URL, so we hash that to create a public key. There will be
  49 // no corresponding private key, which means that these extensions cannot be
  50 // auto-updated using ExtensionUpdater.
  51 std::string GenerateKey(const GURL& app_url) {
  52   char raw[crypto::kSHA256Length] = {0};
  53   std::string key;
  54   crypto::SHA256HashString(app_url.spec().c_str(), raw,
  55                            crypto::kSHA256Length);
  56   base::Base64Encode(std::string(raw, crypto::kSHA256Length), &key);
  57   return key;
  58 }
  59
  60 }  // namespace
  61
  62 // Generates a version for the converted app using the current date. This isn't
  63 // really needed, but it seems like useful information.
  64 std::string ConvertTimeToExtensionVersion(const Time& create_time) {
  65   Time::Exploded create_time_exploded;
  66   create_time.UTCExplode(&create_time_exploded);
  67
  68   double micros = static_cast<double>(
  69       (create_time_exploded.millisecond * Time::kMicrosecondsPerMillisecond) +
  70       (create_time_exploded.second * Time::kMicrosecondsPerSecond) +
  71       (create_time_exploded.minute * Time::kMicrosecondsPerMinute) +
  72       (create_time_exploded.hour * Time::kMicrosecondsPerHour));
  73   double day_fraction = micros / Time::kMicrosecondsPerDay;
  74   double stamp = day_fraction * std::numeric_limits<uint16>::max();
  75
  76   // Ghetto-round, since VC++ doesn't have round().
  77   stamp = stamp >= (floor(stamp) + 0.5) ? (stamp + 1) : stamp;
  78
  79   return base::StringPrintf("%i.%i.%i.%i",
  80                             create_time_exploded.year,
  81                             create_time_exploded.month,
  82                             create_time_exploded.day_of_month,
  83                             static_cast<uint16>(stamp));
  84 }
  85
  86 scoped_refptr<Extension> ConvertWebAppToExtension(
  87     const WebApplicationInfo& web_app,
  88     const Time& create_time,
  89     const base::FilePath& extensions_dir) {
  90   base::FilePath install_temp_dir =
  91       file_util::GetInstallTempDir(extensions_dir);
  92   if (install_temp_dir.empty()) {
  93     LOG(ERROR) << "Could not get path to profile temporary directory.";
  94     return NULL;
  95   }
  96
  97   base::ScopedTempDir temp_dir;
  98   if (!temp_dir.CreateUniqueTempDirUnderPath(install_temp_dir)) {
  99     LOG(ERROR) << "Could not create temporary directory.";
 100     return NULL;
 101   }
 102
 103   // Create the manifest
 104   scoped_ptr<base::DictionaryValue> root(new base::DictionaryValue);
 105   root->SetString(keys::kPublicKey, GenerateKey(web_app.app_url));
 106   root->SetString(keys::kName, base::UTF16ToUTF8(web_app.title));
 107   root->SetString(keys::kVersion, ConvertTimeToExtensionVersion(create_time));
 108   root->SetString(keys::kDescription, base::UTF16ToUTF8(web_app.description));
 109   root->SetString(keys::kLaunchWebURL, web_app.app_url.spec());
 110   if (web_app.generated_icon_color != SK_ColorTRANSPARENT) {
 111     root->SetString(keys::kAppIconColor, image_util::GenerateCSSColorString(
 112                                              web_app.generated_icon_color));
 113   }
 114
 115   // Add the icons and linked icon information.
 116   base::DictionaryValue* icons = new base::DictionaryValue();
 117   root->Set(keys::kIcons, icons);
 118   base::ListValue* linked_icons = new base::ListValue();
 119   root->Set(keys::kLinkedAppIcons, linked_icons);
 120   for (const auto& icon : web_app.icons) {
 121     std::string size = base::StringPrintf("%i", icon.width);
 122     std::string icon_path = base::StringPrintf("%s/%s.png", kIconsDirName,
 123                                                size.c_str());
 124     icons->SetString(size, icon_path);
 125
 126     if (icon.url.is_valid()) {
 127       base::DictionaryValue* linked_icon = new base::DictionaryValue();
 128       linked_icon->SetString(keys::kLinkedAppIconURL, icon.url.spec());
 129       linked_icon->SetInteger(keys::kLinkedAppIconSize, icon.width);
 130       linked_icons->Append(linked_icon);
 131     }
 132   }
 133
 134   // Write the manifest.
 135   base::FilePath manifest_path = temp_dir.path().Append(kManifestFilename);
 136   JSONFileValueSerializer serializer(manifest_path);
 137   if (!serializer.Serialize(*root)) {
 138     LOG(ERROR) << "Could not serialize manifest.";
 139     return NULL;
 140   }
 141
 142   // Write the icon files.
 143   base::FilePath icons_dir = temp_dir.path().AppendASCII(kIconsDirName);
 144   if (!base::CreateDirectory(icons_dir)) {
 145     LOG(ERROR) << "Could not create icons directory.";
 146     return NULL;
 147   }
 148   for (size_t i = 0; i < web_app.icons.size(); ++i) {
 149     // Skip unfetched bitmaps.
 150     if (web_app.icons[i].data.colorType() == kUnknown_SkColorType)
 151       continue;
 152
 153     base::FilePath icon_file = icons_dir.AppendASCII(
 154         base::StringPrintf("%i.png", web_app.icons[i].width));
 155     std::vector<unsigned char> image_data;
 156     if (!gfx::PNGCodec::EncodeBGRASkBitmap(web_app.icons[i].data,
 157                                            false,
 158                                            &image_data)) {
 159       LOG(ERROR) << "Could not create icon file.";
 160       return NULL;
 161     }
 162
 163     const char* image_data_ptr = reinterpret_cast<const char*>(&image_data[0]);
 164     int size = base::checked_cast<int>(image_data.size());
 165     if (base::WriteFile(icon_file, image_data_ptr, size) != size) {
 166       LOG(ERROR) << "Could not write icon file.";
 167       return NULL;
 168     }
 169   }
 170
 171   // Finally, create the extension object to represent the unpacked directory.
 172   std::string error;
 173   scoped_refptr<Extension> extension = Extension::Create(
 174       temp_dir.path(),
 175       Manifest::INTERNAL,
 176       *root,
 177       Extension::FROM_BOOKMARK,
 178       &error);
 179   if (!extension.get()) {
 180     LOG(ERROR) << error;
 181     return NULL;
 182   }
 183
 184   temp_dir.Take();  // The caller takes ownership of the directory.
 185   return extension;
 186 }
 187
 188 }  // namespace extensions