src/chrome/browser/apps/ephemeral_app_launcher.cc

   1 // Copyright 2013 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/apps/ephemeral_app_launcher.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/strings/utf_string_conversions.h"
   9 #include "chrome/browser/extensions/extension_install_checker.h"
  10 #include "chrome/browser/extensions/extension_install_prompt.h"
  11 #include "chrome/browser/extensions/extension_util.h"
  12 #include "chrome/browser/profiles/profile.h"
  13 #include "chrome/browser/ui/browser_navigator.h"
  14 #include "chrome/browser/ui/extensions/application_launch.h"
  15 #include "chrome/browser/ui/extensions/extension_enable_flow.h"
  16 #include "chrome/browser/ui/scoped_tabbed_browser_displayer.h"
  17 #include "chrome/common/chrome_switches.h"
  18 #include "chrome/common/extensions/manifest_handlers/app_launch_info.h"
  19 #include "content/public/browser/web_contents.h"
  20 #include "extensions/browser/extension_prefs.h"
  21 #include "extensions/browser/extension_registry.h"
  22 #include "extensions/browser/extension_system.h"
  23 #include "extensions/browser/management_policy.h"
  24 #include "extensions/common/permissions/permissions_data.h"
  25
  26 using content::WebContents;
  27 using extensions::Extension;
  28 using extensions::ExtensionInstallChecker;
  29 using extensions::ExtensionPrefs;
  30 using extensions::ExtensionRegistry;
  31 using extensions::ExtensionSystem;
  32 using extensions::ManagementPolicy;
  33 using extensions::WebstoreInstaller;
  34 namespace webstore_install = extensions::webstore_install;
  35
  36 namespace {
  37
  38 const char kInvalidManifestError[] = "Invalid manifest";
  39 const char kExtensionTypeError[] = "Not an app";
  40 const char kAppTypeError[] = "Ephemeral legacy packaged apps not supported";
  41 const char kUserCancelledError[] = "Launch cancelled by the user";
  42 const char kBlacklistedError[] = "App is blacklisted for malware";
  43 const char kRequirementsError[] = "App has missing requirements";
  44 const char kFeatureDisabledError[] = "Launching ephemeral apps is not enabled";
  45 const char kMissingAppError[] = "App is not installed";
  46 const char kAppDisabledError[] = "App is disabled";
  47
  48 Profile* ProfileForWebContents(content::WebContents* contents) {
  49   if (!contents)
  50     return NULL;
  51
  52   return Profile::FromBrowserContext(contents->GetBrowserContext());
  53 }
  54
  55 gfx::NativeWindow NativeWindowForWebContents(content::WebContents* contents) {
  56   if (!contents)
  57     return NULL;
  58
  59   return contents->GetTopLevelNativeWindow();
  60 }
  61
  62 // Check whether an extension can be launched. The extension does not need to
  63 // be currently installed.
  64 bool CheckCommonLaunchCriteria(Profile* profile,
  65                                const Extension* extension,
  66                                webstore_install::Result* reason,
  67                                std::string* error) {
  68   // Only apps can be launched.
  69   if (!extension->is_app()) {
  70     *reason = webstore_install::LAUNCH_UNSUPPORTED_EXTENSION_TYPE;
  71     *error = kExtensionTypeError;
  72     return false;
  73   }
  74
  75   // Do not launch apps blocked by management policies.
  76   ManagementPolicy* management_policy =
  77       ExtensionSystem::Get(profile)->management_policy();
  78   base::string16 policy_error;
  79   if (!management_policy->UserMayLoad(extension, &policy_error)) {
  80     *reason = webstore_install::BLOCKED_BY_POLICY;
  81     *error = base::UTF16ToUTF8(policy_error);
  82     return false;
  83   }
  84
  85   return true;
  86 }
  87
  88 }  // namespace
  89
  90 // static
  91 bool EphemeralAppLauncher::IsFeatureEnabled() {
  92   return CommandLine::ForCurrentProcess()->HasSwitch(
  93       switches::kEnableEphemeralApps);
  94 }
  95
  96 // static
  97 scoped_refptr<EphemeralAppLauncher> EphemeralAppLauncher::CreateForLauncher(
  98     const std::string& webstore_item_id,
  99     Profile* profile,
 100     gfx::NativeWindow parent_window,
 101     const LaunchCallback& callback) {
 102   scoped_refptr<EphemeralAppLauncher> installer =
 103       new EphemeralAppLauncher(webstore_item_id,
 104                                profile,
 105                                parent_window,
 106                                callback);
 107   installer->set_install_source(WebstoreInstaller::INSTALL_SOURCE_APP_LAUNCHER);
 108   return installer;
 109 }
 110
 111 // static
 112 scoped_refptr<EphemeralAppLauncher> EphemeralAppLauncher::CreateForWebContents(
 113     const std::string& webstore_item_id,
 114     content::WebContents* web_contents,
 115     const LaunchCallback& callback) {
 116   scoped_refptr<EphemeralAppLauncher> installer =
 117       new EphemeralAppLauncher(webstore_item_id, web_contents, callback);
 118   installer->set_install_source(WebstoreInstaller::INSTALL_SOURCE_OTHER);
 119   return installer;
 120 }
 121
 122 void EphemeralAppLauncher::Start() {
 123   if (!IsFeatureEnabled()) {
 124     InvokeCallback(webstore_install::LAUNCH_FEATURE_DISABLED,
 125                    kFeatureDisabledError);
 126     return;
 127   }
 128
 129   // Check whether the app already exists in extension system before downloading
 130   // from the webstore.
 131   const Extension* extension =
 132       ExtensionRegistry::Get(profile())
 133           ->GetExtensionById(id(), ExtensionRegistry::EVERYTHING);
 134   if (extension) {
 135     webstore_install::Result result = webstore_install::OTHER_ERROR;
 136     std::string error;
 137     if (!CanLaunchInstalledApp(extension, &result, &error)) {
 138       InvokeCallback(result, error);
 139       return;
 140     }
 141
 142     if (extensions::util::IsAppLaunchableWithoutEnabling(extension->id(),
 143                                                          profile())) {
 144       LaunchApp(extension);
 145       InvokeCallback(webstore_install::SUCCESS, std::string());
 146       return;
 147     }
 148
 149     EnableInstalledApp(extension);
 150     return;
 151   }
 152
 153   // Install the app ephemerally and launch when complete.
 154   BeginInstall();
 155 }
 156
 157 EphemeralAppLauncher::EphemeralAppLauncher(const std::string& webstore_item_id,
 158                                            Profile* profile,
 159                                            gfx::NativeWindow parent_window,
 160                                            const LaunchCallback& callback)
 161     : WebstoreStandaloneInstaller(webstore_item_id, profile, Callback()),
 162       launch_callback_(callback),
 163       parent_window_(parent_window),
 164       dummy_web_contents_(
 165           WebContents::Create(WebContents::CreateParams(profile))) {
 166 }
 167
 168 EphemeralAppLauncher::EphemeralAppLauncher(const std::string& webstore_item_id,
 169                                            content::WebContents* web_contents,
 170                                            const LaunchCallback& callback)
 171     : WebstoreStandaloneInstaller(webstore_item_id,
 172                                   ProfileForWebContents(web_contents),
 173                                   Callback()),
 174       content::WebContentsObserver(web_contents),
 175       launch_callback_(callback),
 176       parent_window_(NativeWindowForWebContents(web_contents)) {
 177 }
 178
 179 EphemeralAppLauncher::~EphemeralAppLauncher() {}
 180
 181 scoped_ptr<extensions::ExtensionInstallChecker>
 182 EphemeralAppLauncher::CreateInstallChecker() {
 183   return make_scoped_ptr(new ExtensionInstallChecker(profile()));
 184 }
 185
 186 scoped_ptr<ExtensionInstallPrompt> EphemeralAppLauncher::CreateInstallUI() {
 187   if (web_contents())
 188     return make_scoped_ptr(new ExtensionInstallPrompt(web_contents()));
 189
 190   return make_scoped_ptr(
 191       new ExtensionInstallPrompt(profile(), parent_window_, NULL));
 192 }
 193
 194 scoped_ptr<WebstoreInstaller::Approval> EphemeralAppLauncher::CreateApproval()
 195     const {
 196   scoped_ptr<WebstoreInstaller::Approval> approval =
 197       WebstoreStandaloneInstaller::CreateApproval();
 198   approval->is_ephemeral = true;
 199   return approval.Pass();
 200 }
 201
 202 bool EphemeralAppLauncher::CanLaunchInstalledApp(
 203     const extensions::Extension* extension,
 204     webstore_install::Result* reason,
 205     std::string* error) {
 206   if (!CheckCommonLaunchCriteria(profile(), extension, reason, error))
 207     return false;
 208
 209   // Do not launch blacklisted apps.
 210   if (ExtensionPrefs::Get(profile())->IsExtensionBlacklisted(extension->id())) {
 211     *reason = webstore_install::BLACKLISTED;
 212     *error = kBlacklistedError;
 213     return false;
 214   }
 215
 216   // If the app has missing requirements, it cannot be launched.
 217   if (!extensions::util::IsAppLaunchable(extension->id(), profile())) {
 218     *reason = webstore_install::REQUIREMENT_VIOLATIONS;
 219     *error = kRequirementsError;
 220     return false;
 221   }
 222
 223   return true;
 224 }
 225
 226 void EphemeralAppLauncher::EnableInstalledApp(const Extension* extension) {
 227   // Check whether an install is already in progress.
 228   webstore_install::Result result = webstore_install::OTHER_ERROR;
 229   std::string error;
 230   if (!EnsureUniqueInstall(&result, &error)) {
 231     InvokeCallback(result, error);
 232     return;
 233   }
 234
 235   // Keep this object alive until the enable flow is complete. Either
 236   // ExtensionEnableFlowFinished() or ExtensionEnableFlowAborted() will be
 237   // called.
 238   AddRef();
 239
 240   extension_enable_flow_.reset(
 241       new ExtensionEnableFlow(profile(), extension->id(), this));
 242   if (web_contents())
 243     extension_enable_flow_->StartForWebContents(web_contents());
 244   else
 245     extension_enable_flow_->StartForNativeWindow(parent_window_);
 246 }
 247
 248 void EphemeralAppLauncher::MaybeLaunchApp() {
 249   webstore_install::Result result = webstore_install::OTHER_ERROR;
 250   std::string error;
 251
 252   ExtensionRegistry* registry = ExtensionRegistry::Get(profile());
 253   const Extension* extension =
 254       registry->GetExtensionById(id(), ExtensionRegistry::EVERYTHING);
 255   if (extension) {
 256     // Although the installation was successful, the app may not be
 257     // launchable.
 258     if (registry->enabled_extensions().Contains(extension->id())) {
 259       result = webstore_install::SUCCESS;
 260       LaunchApp(extension);
 261     } else {
 262       error = kAppDisabledError;
 263       // Determine why the app cannot be launched.
 264       CanLaunchInstalledApp(extension, &result, &error);
 265     }
 266   } else {
 267     // The extension must be present in the registry if installed.
 268     NOTREACHED();
 269     error = kMissingAppError;
 270   }
 271
 272   InvokeCallback(result, error);
 273 }
 274
 275 void EphemeralAppLauncher::LaunchApp(const Extension* extension) const {
 276   DCHECK(extension && extension->is_app() &&
 277          ExtensionRegistry::Get(profile())
 278              ->GetExtensionById(extension->id(), ExtensionRegistry::ENABLED));
 279
 280   AppLaunchParams params(profile(), extension, NEW_FOREGROUND_TAB);
 281   params.desktop_type =
 282       chrome::GetHostDesktopTypeForNativeWindow(parent_window_);
 283   OpenApplication(params);
 284 }
 285
 286 bool EphemeralAppLauncher::LaunchHostedApp(const Extension* extension) const {
 287   GURL launch_url = extensions::AppLaunchInfo::GetLaunchWebURL(extension);
 288   if (!launch_url.is_valid())
 289     return false;
 290
 291   chrome::ScopedTabbedBrowserDisplayer displayer(
 292       profile(), chrome::GetHostDesktopTypeForNativeWindow(parent_window_));
 293   chrome::NavigateParams params(
 294       displayer.browser(), launch_url, content::PAGE_TRANSITION_AUTO_TOPLEVEL);
 295   params.disposition = NEW_FOREGROUND_TAB;
 296   chrome::Navigate(&params);
 297   return true;
 298 }
 299
 300 void EphemeralAppLauncher::InvokeCallback(webstore_install::Result result,
 301                                           const std::string& error) {
 302   if (!launch_callback_.is_null()) {
 303     LaunchCallback callback = launch_callback_;
 304     launch_callback_.Reset();
 305     callback.Run(result, error);
 306   }
 307 }
 308
 309 void EphemeralAppLauncher::AbortLaunch(webstore_install::Result result,
 310                                        const std::string& error) {
 311   InvokeCallback(result, error);
 312   WebstoreStandaloneInstaller::CompleteInstall(result, error);
 313 }
 314
 315 void EphemeralAppLauncher::CheckEphemeralInstallPermitted() {
 316   scoped_refptr<const Extension> extension = GetLocalizedExtensionForDisplay();
 317   DCHECK(extension.get());  // Checked in OnManifestParsed().
 318
 319   install_checker_ = CreateInstallChecker();
 320   DCHECK(install_checker_.get());
 321
 322   install_checker_->set_extension(extension);
 323   install_checker_->Start(ExtensionInstallChecker::CHECK_BLACKLIST |
 324                               ExtensionInstallChecker::CHECK_REQUIREMENTS,
 325                           true,
 326                           base::Bind(&EphemeralAppLauncher::OnInstallChecked,
 327                                      base::Unretained(this)));
 328 }
 329
 330 void EphemeralAppLauncher::OnInstallChecked(int check_failures) {
 331   if (!CheckRequestorAlive()) {
 332     AbortLaunch(webstore_install::OTHER_ERROR, std::string());
 333     return;
 334   }
 335
 336   if (install_checker_->blacklist_state() == extensions::BLACKLISTED_MALWARE) {
 337     AbortLaunch(webstore_install::BLACKLISTED, kBlacklistedError);
 338     return;
 339   }
 340
 341   if (!install_checker_->requirement_errors().empty()) {
 342     AbortLaunch(webstore_install::REQUIREMENT_VIOLATIONS,
 343                 install_checker_->requirement_errors().front());
 344     return;
 345   }
 346
 347   // Proceed with the normal install flow.
 348   ProceedWithInstallPrompt();
 349 }
 350
 351 void EphemeralAppLauncher::InitInstallData(
 352     extensions::ActiveInstallData* install_data) const {
 353   install_data->is_ephemeral = true;
 354 }
 355
 356 bool EphemeralAppLauncher::CheckRequestorAlive() const {
 357   return dummy_web_contents_.get() != NULL || web_contents() != NULL;
 358 }
 359
 360 const GURL& EphemeralAppLauncher::GetRequestorURL() const {
 361   return GURL::EmptyGURL();
 362 }
 363
 364 bool EphemeralAppLauncher::ShouldShowPostInstallUI() const {
 365   return false;
 366 }
 367
 368 bool EphemeralAppLauncher::ShouldShowAppInstalledBubble() const {
 369   return false;
 370 }
 371
 372 WebContents* EphemeralAppLauncher::GetWebContents() const {
 373   return web_contents() ? web_contents() : dummy_web_contents_.get();
 374 }
 375
 376 scoped_refptr<ExtensionInstallPrompt::Prompt>
 377 EphemeralAppLauncher::CreateInstallPrompt() const {
 378   const Extension* extension = localized_extension_for_display();
 379   DCHECK(extension);  // Checked in OnManifestParsed().
 380
 381   // Skip the prompt by returning null if the app does not need to display
 382   // permission warnings.
 383   extensions::PermissionMessages permissions =
 384       extension->permissions_data()->GetPermissionMessages();
 385   if (permissions.empty())
 386     return NULL;
 387
 388   return make_scoped_refptr(new ExtensionInstallPrompt::Prompt(
 389       ExtensionInstallPrompt::LAUNCH_PROMPT));
 390 }
 391
 392 bool EphemeralAppLauncher::CheckInlineInstallPermitted(
 393     const base::DictionaryValue& webstore_data,
 394     std::string* error) const {
 395   *error = "";
 396   return true;
 397 }
 398
 399 bool EphemeralAppLauncher::CheckRequestorPermitted(
 400     const base::DictionaryValue& webstore_data,
 401     std::string* error) const {
 402   *error = "";
 403   return true;
 404 }
 405
 406 void EphemeralAppLauncher::OnManifestParsed() {
 407   const Extension* extension = GetLocalizedExtensionForDisplay();
 408   if (!extension) {
 409     AbortLaunch(webstore_install::INVALID_MANIFEST, kInvalidManifestError);
 410     return;
 411   }
 412
 413   webstore_install::Result result = webstore_install::OTHER_ERROR;
 414   std::string error;
 415   if (!CheckCommonLaunchCriteria(profile(), extension, &result, &error)) {
 416     AbortLaunch(result, error);
 417     return;
 418   }
 419
 420   if (extension->is_legacy_packaged_app()) {
 421     AbortLaunch(webstore_install::LAUNCH_UNSUPPORTED_EXTENSION_TYPE,
 422                 kAppTypeError);
 423     return;
 424   }
 425
 426   if (extension->is_hosted_app()) {
 427     // Hosted apps do not need to be installed ephemerally. Just navigate to
 428     // their launch url.
 429     if (LaunchHostedApp(extension))
 430       AbortLaunch(webstore_install::SUCCESS, std::string());
 431     else
 432       AbortLaunch(webstore_install::INVALID_MANIFEST, kInvalidManifestError);
 433     return;
 434   }
 435
 436   CheckEphemeralInstallPermitted();
 437 }
 438
 439 void EphemeralAppLauncher::CompleteInstall(webstore_install::Result result,
 440                                            const std::string& error) {
 441   if (result == webstore_install::SUCCESS)
 442     MaybeLaunchApp();
 443   else if (!launch_callback_.is_null())
 444     InvokeCallback(result, error);
 445
 446   WebstoreStandaloneInstaller::CompleteInstall(result, error);
 447 }
 448
 449 void EphemeralAppLauncher::WebContentsDestroyed() {
 450   launch_callback_.Reset();
 451   AbortInstall();
 452 }
 453
 454 void EphemeralAppLauncher::ExtensionEnableFlowFinished() {
 455   MaybeLaunchApp();
 456
 457   // CompleteInstall will call Release.
 458   WebstoreStandaloneInstaller::CompleteInstall(webstore_install::SUCCESS,
 459                                                std::string());
 460 }
 461
 462 void EphemeralAppLauncher::ExtensionEnableFlowAborted(bool user_initiated) {
 463   // CompleteInstall will call Release.
 464   CompleteInstall(webstore_install::USER_CANCELLED, kUserCancelledError);
 465 }