1 // Copyright (c) 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.
5 #ifndef EXTENSIONS_COMMON_EXTENSION_H_
6 #define EXTENSIONS_COMMON_EXTENSION_H_
16 #include "base/containers/hash_tables.h"
17 #include "base/files/file_path.h"
18 #include "base/memory/linked_ptr.h"
19 #include "base/memory/ref_counted.h"
20 #include "base/memory/scoped_ptr.h"
21 #include "base/synchronization/lock.h"
22 #include "base/threading/thread_checker.h"
23 #include "extensions/common/extension_resource.h"
24 #include "extensions/common/install_warning.h"
25 #include "extensions/common/manifest.h"
26 #include "extensions/common/url_pattern_set.h"
27 #include "ui/base/accelerators/accelerator.h"
28 #include "ui/gfx/size.h"
31 #if !defined(ENABLE_EXTENSIONS)
32 #error "Extensions must be enabled"
36 class DictionaryValue;
40 namespace extensions {
42 class PermissionsData;
43 class PermissionsParser;
45 // Uniquely identifies an Extension, using 32 characters from the alphabet
46 // 'a'-'p'. An empty string represents "no extension".
48 // Note: If this gets used heavily in files that don't otherwise need to include
49 // extension.h, we should pull it into a dedicated header.
50 typedef std::string ExtensionId;
52 // Represents a Chrome extension.
53 // Once created, an Extension object is immutable, with the exception of its
54 // RuntimeData. This makes it safe to use on any thread, since access to the
55 // RuntimeData is protected by a lock.
56 class Extension : public base::RefCountedThreadSafe<Extension> {
60 typedef std::map<const std::string, linked_ptr<ManifestData> >
66 // An external extension that the user uninstalled. We should not reinstall
67 // such extensions on startup.
68 EXTERNAL_EXTENSION_UNINSTALLED,
69 // DEPRECATED: Special state for component extensions.
70 // Maintained as a placeholder since states may be stored to disk.
71 ENABLED_COMPONENT_DEPRECATED,
75 // Used to record the reason an extension was disabled.
76 enum DeprecatedDisableReason {
77 DEPRECATED_DISABLE_UNKNOWN,
78 DEPRECATED_DISABLE_USER_ACTION,
79 DEPRECATED_DISABLE_PERMISSIONS_INCREASE,
80 DEPRECATED_DISABLE_RELOAD,
81 DEPRECATED_DISABLE_LAST, // Not used.
84 // Reasons an extension may be disabled. These are used in histograms, so do
85 // not remove/reorder entries - only add at the end just before
86 // DISABLE_REASON_LAST (and update the shift value for it). Also remember to
87 // update the enum listing in tools/metrics/histograms.xml.
90 DISABLE_USER_ACTION = 1 << 0,
91 DISABLE_PERMISSIONS_INCREASE = 1 << 1,
92 DISABLE_RELOAD = 1 << 2,
93 DISABLE_UNSUPPORTED_REQUIREMENT = 1 << 3,
94 DISABLE_SIDELOAD_WIPEOUT = 1 << 4,
95 DISABLE_UNKNOWN_FROM_SYNC = 1 << 5,
96 // DISABLE_PERMISSIONS_CONSENT = 1 << 6, // Deprecated.
97 // DISABLE_KNOWN_DISABLED = 1 << 7, // Deprecated.
98 DISABLE_NOT_VERIFIED = 1 << 8, // Disabled because we could not verify
100 DISABLE_GREYLIST = 1 << 9,
101 DISABLE_CORRUPTED = 1 << 10,
102 DISABLE_REMOTE_INSTALL = 1 << 11,
103 DISABLE_INACTIVE_EPHEMERAL_APP = 1 << 12, // Cached ephemeral apps are
104 // disabled to prevent activity.
105 DISABLE_REASON_LAST = 1 << 13, // This should always be the last value
108 // A base class for parsed manifest data that APIs want to store on
109 // the extension. Related to base::SupportsUserData, but with an immutable
110 // thread-safe interface to match Extension.
111 struct ManifestData {
112 virtual ~ManifestData() {}
115 // Do not change the order of entries or remove entries in this list
116 // as this is used in UMA_HISTOGRAM_ENUMERATIONs about extensions.
117 enum InitFromValueFlags {
120 // Usually, the id of an extension is generated by the "key" property of
121 // its manifest, but if |REQUIRE_KEY| is not set, a temporary ID will be
122 // generated based on the path.
123 REQUIRE_KEY = 1 << 0,
125 // Requires the extension to have an up-to-date manifest version.
126 // Typically, we'll support multiple manifest versions during a version
127 // transition. This flag signals that we want to require the most modern
128 // manifest version that Chrome understands.
129 REQUIRE_MODERN_MANIFEST_VERSION = 1 << 1,
131 // |ALLOW_FILE_ACCESS| indicates that the user is allowing this extension
132 // to have file access. If it's not present, then permissions and content
133 // scripts that match file:/// URLs will be filtered out.
134 ALLOW_FILE_ACCESS = 1 << 2,
136 // |FROM_WEBSTORE| indicates that the extension was installed from the
138 FROM_WEBSTORE = 1 << 3,
140 // |FROM_BOOKMARK| indicates the extension is a bookmark app which has been
141 // generated from a web page. Bookmark apps have no permissions or extent
142 // and launch the web page they are created from when run.
143 FROM_BOOKMARK = 1 << 4,
145 // |FOLLOW_SYMLINKS_ANYWHERE| means that resources can be symlinks to
146 // anywhere in the filesystem, rather than being restricted to the
147 // extension directory.
148 FOLLOW_SYMLINKS_ANYWHERE = 1 << 5,
150 // |ERROR_ON_PRIVATE_KEY| means that private keys inside an
151 // extension should be errors rather than warnings.
152 ERROR_ON_PRIVATE_KEY = 1 << 6,
154 // |WAS_INSTALLED_BY_DEFAULT| installed by default when the profile was
156 WAS_INSTALLED_BY_DEFAULT = 1 << 7,
158 // Unused - was part of an abandoned experiment.
159 REQUIRE_PERMISSIONS_CONSENT = 1 << 8,
161 // Unused - this flag has been moved to ExtensionPrefs.
162 IS_EPHEMERAL = 1 << 9,
164 // |WAS_INSTALLED_BY_OEM| installed by an OEM (e.g on Chrome OS) and should
165 // be placed in a special OEM folder in the App Launcher. Note: OEM apps are
166 // also installed by Default (i.e. WAS_INSTALLED_BY_DEFAULT is also true).
167 WAS_INSTALLED_BY_OEM = 1 << 10,
169 // |WAS_INSTALLED_BY_CUSTODIAN| means this extension was installed by the
170 // custodian of a supervised user.
171 WAS_INSTALLED_BY_CUSTODIAN = 1 << 11,
173 // |MAY_BE_UNTRUSTED| indicates that this extension came from a potentially
174 // unsafe source (e.g., sideloaded from a local CRX file via the Windows
175 // registry). Such extensions may be subjected to additional constraints
176 // before they are fully installed and enabled.
177 MAY_BE_UNTRUSTED = 1 << 12,
179 // When adding new flags, make sure to update kInitFromValueFlagBits.
182 // This is the highest bit index of the flags defined above.
183 static const int kInitFromValueFlagBits;
185 static scoped_refptr<Extension> Create(const base::FilePath& path,
186 Manifest::Location location,
187 const base::DictionaryValue& value,
191 // In a few special circumstances, we want to create an Extension and give it
192 // an explicit id. Most consumers should just use the other Create() method.
193 static scoped_refptr<Extension> Create(const base::FilePath& path,
194 Manifest::Location location,
195 const base::DictionaryValue& value,
197 const ExtensionId& explicit_id,
200 // Valid schemes for web extent URLPatterns.
201 static const int kValidWebExtentSchemes;
203 // Valid schemes for host permission URLPatterns.
204 static const int kValidHostPermissionSchemes;
206 // The mimetype used for extensions.
207 static const char kMimeType[];
209 // See Type definition in Manifest.
210 Manifest::Type GetType() const;
212 // Returns an absolute url to a resource inside of an extension. The
213 // |extension_url| argument should be the url() from an Extension object. The
214 // |relative_path| can be untrusted user input. The returned URL will either
215 // be invalid() or a child of |extension_url|.
216 // NOTE: Static so that it can be used from multiple threads.
217 static GURL GetResourceURL(const GURL& extension_url,
218 const std::string& relative_path);
219 GURL GetResourceURL(const std::string& relative_path) const {
220 return GetResourceURL(url(), relative_path);
223 // Returns true if the resource matches a pattern in the pattern_set.
224 bool ResourceMatches(const URLPatternSet& pattern_set,
225 const std::string& resource) const;
227 // Returns an extension resource object. |relative_path| should be UTF8
229 ExtensionResource GetResource(const std::string& relative_path) const;
231 // As above, but with |relative_path| following the file system's encoding.
232 ExtensionResource GetResource(const base::FilePath& relative_path) const;
234 // |input| is expected to be the text of an rsa public or private key. It
235 // tolerates the presence or absence of bracking header/footer like this:
236 // -----(BEGIN|END) [RSA PUBLIC/PRIVATE] KEY-----
237 // and may contain newlines.
238 static bool ParsePEMKeyBytes(const std::string& input, std::string* output);
240 // Does a simple base64 encoding of |input| into |output|.
241 static bool ProducePEM(const std::string& input, std::string* output);
243 // Expects base64 encoded |input| and formats into |output| including
244 // the appropriate header & footer.
245 static bool FormatPEMForFileOutput(const std::string& input,
249 // Returns the base extension url for a given |extension_id|.
250 static GURL GetBaseURLFromExtensionId(const ExtensionId& extension_id);
252 // Whether context menu should be shown for page and browser actions.
253 bool ShowConfigureContextMenus() const;
255 // Returns true if this extension or app includes areas within |origin|.
256 bool OverlapsWithOrigin(const GURL& origin) const;
258 // Returns true if the extension requires a valid ordinal for sorting, e.g.,
259 // for displaying in a launcher or new tab page.
260 bool RequiresSortOrdinal() const;
262 // Returns true if the extension should be displayed in the app launcher.
263 bool ShouldDisplayInAppLauncher() const;
265 // Returns true if the extension should be displayed in the browser NTP.
266 bool ShouldDisplayInNewTabPage() const;
268 // Returns true if the extension should be displayed in the extension
269 // settings page (i.e. chrome://extensions).
270 bool ShouldDisplayInExtensionSettings() const;
272 // Returns true if the extension should not be shown anywhere. This is
273 // mostly the same as the extension being a component extension, but also
274 // includes non-component apps that are hidden from the app launcher and ntp.
275 bool ShouldNotBeVisible() const;
277 // Get the manifest data associated with the key, or NULL if there is none.
278 // Can only be called after InitValue is finished.
279 ManifestData* GetManifestData(const std::string& key) const;
281 // Sets |data| to be associated with the key. Takes ownership of |data|.
282 // Can only be called before InitValue is finished. Not thread-safe;
283 // all SetManifestData calls should be on only one thread.
284 void SetManifestData(const std::string& key, ManifestData* data);
288 const base::FilePath& path() const { return path_; }
289 const GURL& url() const { return extension_url_; }
290 Manifest::Location location() const;
291 const ExtensionId& id() const;
292 const base::Version* version() const { return version_.get(); }
293 const std::string VersionString() const;
294 const std::string& name() const { return name_; }
295 const std::string& short_name() const { return short_name_; }
296 const std::string& non_localized_name() const { return non_localized_name_; }
297 // Base64-encoded version of the key used to sign this extension.
298 // In pseudocode, returns
299 // base::Base64Encode(RSAPrivateKey(pem_file).ExportPublicKey()).
300 const std::string& public_key() const { return public_key_; }
301 const std::string& description() const { return description_; }
302 int manifest_version() const { return manifest_version_; }
303 bool converted_from_user_script() const {
304 return converted_from_user_script_;
306 PermissionsParser* permissions_parser() { return permissions_parser_.get(); }
307 const PermissionsParser* permissions_parser() const {
308 return permissions_parser_.get();
311 const PermissionsData* permissions_data() const {
312 return permissions_data_.get();
315 // Appends |new_warning[s]| to install_warnings_.
316 void AddInstallWarning(const InstallWarning& new_warning);
317 void AddInstallWarnings(const std::vector<InstallWarning>& new_warnings);
318 const std::vector<InstallWarning>& install_warnings() const {
319 return install_warnings_;
321 const extensions::Manifest* manifest() const {
322 return manifest_.get();
324 bool wants_file_access() const { return wants_file_access_; }
325 // TODO(rdevlin.cronin): This is needed for ContentScriptsHandler, and should
326 // be moved out as part of crbug.com/159265. This should not be used anywhere
328 void set_wants_file_access(bool wants_file_access) {
329 wants_file_access_ = wants_file_access;
331 int creation_flags() const { return creation_flags_; }
332 bool from_webstore() const { return (creation_flags_ & FROM_WEBSTORE) != 0; }
333 bool from_bookmark() const { return (creation_flags_ & FROM_BOOKMARK) != 0; }
334 bool was_installed_by_default() const {
335 return (creation_flags_ & WAS_INSTALLED_BY_DEFAULT) != 0;
337 bool was_installed_by_oem() const {
338 return (creation_flags_ & WAS_INSTALLED_BY_OEM) != 0;
340 bool was_installed_by_custodian() const {
341 return (creation_flags_ & WAS_INSTALLED_BY_CUSTODIAN) != 0;
344 // Type-related queries.
346 bool is_platform_app() const;
347 bool is_hosted_app() const;
348 bool is_legacy_packaged_app() const;
349 bool is_extension() const;
350 bool is_shared_module() const;
351 bool is_theme() const;
353 bool can_be_incognito_enabled() const;
355 void AddWebExtentPattern(const URLPattern& pattern);
356 const URLPatternSet& web_extent() const { return extent_; }
359 friend class base::RefCountedThreadSafe<Extension>;
361 // Chooses the extension ID for an extension based on a variety of criteria.
362 // The chosen ID will be set in |manifest|.
363 static bool InitExtensionID(extensions::Manifest* manifest,
364 const base::FilePath& path,
365 const ExtensionId& explicit_id,
367 base::string16* error);
369 Extension(const base::FilePath& path,
370 scoped_ptr<extensions::Manifest> manifest);
371 virtual ~Extension();
373 // Initialize the extension from a parsed manifest.
374 // TODO(aa): Rename to just Init()? There's no Value here anymore.
375 // TODO(aa): It is really weird the way this class essentially contains a copy
376 // of the underlying DictionaryValue in its members. We should decide to
377 // either wrap the DictionaryValue and go with that only, or we should parse
378 // into strong types and discard the value. But doing both is bad.
379 bool InitFromValue(int flags, base::string16* error);
381 // The following are helpers for InitFromValue to load various features of the
382 // extension from the manifest.
384 bool LoadRequiredFeatures(base::string16* error);
385 bool LoadName(base::string16* error);
386 bool LoadVersion(base::string16* error);
388 bool LoadAppFeatures(base::string16* error);
389 bool LoadExtent(const char* key,
390 URLPatternSet* extent,
391 const char* list_error,
392 const char* value_error,
393 base::string16* error);
395 bool LoadSharedFeatures(base::string16* error);
396 bool LoadDescription(base::string16* error);
397 bool LoadManifestVersion(base::string16* error);
398 bool LoadShortName(base::string16* error);
400 bool CheckMinimumChromeVersion(base::string16* error) const;
402 // The extension's human-readable name. Name is used for display purpose. It
403 // might be wrapped with unicode bidi control characters so that it is
404 // displayed correctly in RTL context.
405 // NOTE: Name is UTF-8 and may contain non-ascii characters.
408 // A non-localized version of the extension's name. This is useful for
410 std::string non_localized_name_;
412 // A short version of the extension's name. This can be used as an alternative
413 // to the name where there is insufficient space to display the full name. If
414 // an extension has not explicitly specified a short name, the value of this
415 // member variable will be the full name rather than an empty string.
416 std::string short_name_;
418 // The version of this extension's manifest. We increase the manifest
419 // version when making breaking changes to the extension system.
420 // Version 1 was the first manifest version (implied by a lack of a
421 // manifest_version attribute in the extension's manifest). We initialize
422 // this member variable to 0 to distinguish the "uninitialized" case from
423 // the case when we know the manifest version actually is 1.
424 int manifest_version_;
426 // The absolute path to the directory the extension is stored in.
427 base::FilePath path_;
429 // Defines the set of URLs in the extension's web content.
430 URLPatternSet extent_;
432 // The parser for the manifest's permissions. This is NULL anytime not during
434 // TODO(rdevlin.cronin): This doesn't really belong here.
435 scoped_ptr<PermissionsParser> permissions_parser_;
437 // The active permissions for the extension.
438 scoped_ptr<PermissionsData> permissions_data_;
440 // Any warnings that occurred when trying to create/parse the extension.
441 std::vector<InstallWarning> install_warnings_;
443 // The base extension url for the extension.
446 // The extension's version.
447 scoped_ptr<base::Version> version_;
449 // An optional longer description of the extension.
450 std::string description_;
452 // True if the extension was generated from a user script. (We show slightly
453 // different UI if so).
454 bool converted_from_user_script_;
456 // The public key used to sign the contents of the crx package.
457 std::string public_key_;
459 // The manifest from which this extension was created.
460 scoped_ptr<Manifest> manifest_;
462 // Stored parsed manifest data.
463 ManifestDataMap manifest_data_;
465 // Set to true at the end of InitValue when initialization is finished.
466 bool finished_parsing_manifest_;
468 // Ensures that any call to GetManifestData() prior to finishing
469 // initialization happens from the same thread (this can happen when certain
470 // parts of the initialization process need information from previous parts).
471 base::ThreadChecker thread_checker_;
473 // Should this app be shown in the app launcher.
474 bool display_in_launcher_;
476 // Should this app be shown in the browser New Tab Page.
477 bool display_in_new_tab_page_;
479 // Whether the extension has host permissions or user script patterns that
480 // imply access to file:/// scheme URLs (the user may not have actually
481 // granted it that access).
482 bool wants_file_access_;
484 // The flags that were passed to InitFromValue.
487 DISALLOW_COPY_AND_ASSIGN(Extension);
490 typedef std::vector<scoped_refptr<const Extension> > ExtensionList;
491 typedef std::set<ExtensionId> ExtensionIdSet;
492 typedef std::vector<ExtensionId> ExtensionIdList;
494 // Handy struct to pass core extension info around.
495 struct ExtensionInfo {
496 ExtensionInfo(const base::DictionaryValue* manifest,
497 const ExtensionId& id,
498 const base::FilePath& path,
499 Manifest::Location location);
502 scoped_ptr<base::DictionaryValue> extension_manifest;
503 ExtensionId extension_id;
504 base::FilePath extension_path;
505 Manifest::Location extension_location;
508 DISALLOW_COPY_AND_ASSIGN(ExtensionInfo);
511 struct InstalledExtensionInfo {
512 // The extension being installed - this should always be non-NULL.
513 const Extension* extension;
515 // True if the extension is being updated; false if it is being installed.
518 // True if the extension was previously installed ephemerally and is now
519 // a regular installed extension.
522 // The name of the extension prior to this update. Will be empty if
523 // |is_update| is false.
524 std::string old_name;
526 InstalledExtensionInfo(const Extension* extension,
529 const std::string& old_name);
532 struct UnloadedExtensionInfo {
533 // TODO(DHNishi): Move this enum to ExtensionRegistryObserver.
535 REASON_UNDEFINED, // Undefined state used to initialize variables.
536 REASON_DISABLE, // Extension is being disabled.
537 REASON_UPDATE, // Extension is being updated to a newer version.
538 REASON_UNINSTALL, // Extension is being uninstalled.
539 REASON_TERMINATE, // Extension has terminated.
540 REASON_BLACKLIST, // Extension has been blacklisted.
541 REASON_PROFILE_SHUTDOWN, // Profile is being shut down.
546 // The extension being unloaded - this should always be non-NULL.
547 const Extension* extension;
549 UnloadedExtensionInfo(const Extension* extension, Reason reason);
552 // The details sent for EXTENSION_PERMISSIONS_UPDATED notifications.
553 struct UpdatedExtensionPermissionsInfo {
555 ADDED, // The permissions were added to the extension.
556 REMOVED, // The permissions were removed from the extension.
561 // The extension who's permissions have changed.
562 const Extension* extension;
564 // The permissions that have changed. For Reason::ADDED, this would contain
565 // only the permissions that have added, and for Reason::REMOVED, this would
566 // only contain the removed permissions.
567 const PermissionSet* permissions;
569 UpdatedExtensionPermissionsInfo(
570 const Extension* extension,
571 const PermissionSet* permissions,
575 } // namespace extensions
577 #endif // EXTENSIONS_COMMON_EXTENSION_H_