gnome-shell/js/ui/extensionSystem.js

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// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
/* exported init connect disconnect */
const { Gio, St } = imports.gi;
const Signals = imports.signals;
const ExtensionUtils = imports.misc.extensionUtils;
const FileUtils = imports.misc.fileUtils;
const Main = imports.ui.main;
const { ExtensionState, ExtensionType } = ExtensionUtils;
const ENABLED_EXTENSIONS_KEY = 'enabled-extensions';
const DISABLED_EXTENSIONS_KEY = 'disabled-extensions';
const DISABLE_USER_EXTENSIONS_KEY = 'disable-user-extensions';
const EXTENSION_DISABLE_VERSION_CHECK_KEY = 'disable-extension-version-validation';
var ExtensionManager = class {
constructor() {
this._initialized = false;
this._enabled = false;
this._extensions = new Map();
this._enabledExtensions = [];
this._extensionOrder = [];
Main.sessionMode.connect('updated', this._sessionUpdated.bind(this));
}
init() {
this._sessionUpdated();
}
lookup(uuid) {
return this._extensions.get(uuid);
}
getUuids() {
return [...this._extensions.keys()];
}
_callExtensionDisable(uuid) {
let extension = this.lookup(uuid);
if (!extension)
return;
if (extension.state != ExtensionState.ENABLED)
return;
// "Rebase" the extension order by disabling and then enabling extensions
// in order to help prevent conflicts.
// Example:
// order = [A, B, C, D, E]
// user disables C
// this should: disable E, disable D, disable C, enable D, enable E
let orderIdx = this._extensionOrder.indexOf(uuid);
let order = this._extensionOrder.slice(orderIdx + 1);
let orderReversed = order.slice().reverse();
for (let i = 0; i < orderReversed.length; i++) {
let uuid = orderReversed[i];
try {
this.lookup(uuid).stateObj.disable();
} catch (e) {
this.logExtensionError(uuid, e);
}
}
if (extension.stylesheet) {
let theme = St.ThemeContext.get_for_stage(global.stage).get_theme();
theme.unload_stylesheet(extension.stylesheet);
delete extension.stylesheet;
}
try {
extension.stateObj.disable();
} catch (e) {
this.logExtensionError(uuid, e);
}
for (let i = 0; i < order.length; i++) {
let uuid = order[i];
try {
this.lookup(uuid).stateObj.enable();
} catch (e) {
this.logExtensionError(uuid, e);
}
}
this._extensionOrder.splice(orderIdx, 1);
if (extension.state != ExtensionState.ERROR) {
extension.state = ExtensionState.DISABLED;
this.emit('extension-state-changed', extension);
}
}
_callExtensionEnable(uuid) {
if (!Main.sessionMode.allowExtensions)
return;
let extension = this.lookup(uuid);
if (!extension)
return;
if (extension.state == ExtensionState.INITIALIZED)
this._callExtensionInit(uuid);
if (extension.state != ExtensionState.DISABLED)
return;
let stylesheetNames = [`${global.session_mode}.css`, 'stylesheet.css'];
let theme = St.ThemeContext.get_for_stage(global.stage).get_theme();
for (let i = 0; i < stylesheetNames.length; i++) {
try {
let stylesheetFile = extension.dir.get_child(stylesheetNames[i]);
theme.load_stylesheet(stylesheetFile);
extension.stylesheet = stylesheetFile;
break;
} catch (e) {
if (e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.NOT_FOUND))
continue; // not an error
this.logExtensionError(uuid, e);
return;
}
}
try {
extension.stateObj.enable();
extension.state = ExtensionState.ENABLED;
this._extensionOrder.push(uuid);
this.emit('extension-state-changed', extension);
} catch (e) {
if (extension.stylesheet) {
theme.unload_stylesheet(extension.stylesheet);
delete extension.stylesheet;
}
this.logExtensionError(uuid, e);
}
}
enableExtension(uuid) {
if (!this._extensions.has(uuid))
return false;
let enabledExtensions = global.settings.get_strv(ENABLED_EXTENSIONS_KEY);
let disabledExtensions = global.settings.get_strv(DISABLED_EXTENSIONS_KEY);
if (disabledExtensions.includes(uuid)) {
disabledExtensions = disabledExtensions.filter(item => item !== uuid);
global.settings.set_strv(DISABLED_EXTENSIONS_KEY, disabledExtensions);
}
if (!enabledExtensions.includes(uuid)) {
enabledExtensions.push(uuid);
global.settings.set_strv(ENABLED_EXTENSIONS_KEY, enabledExtensions);
}
return true;
}
disableExtension(uuid) {
if (!this._extensions.has(uuid))
return false;
let enabledExtensions = global.settings.get_strv(ENABLED_EXTENSIONS_KEY);
let disabledExtensions = global.settings.get_strv(DISABLED_EXTENSIONS_KEY);
if (enabledExtensions.includes(uuid)) {
enabledExtensions = enabledExtensions.filter(item => item !== uuid);
global.settings.set_strv(ENABLED_EXTENSIONS_KEY, enabledExtensions);
}
if (!disabledExtensions.includes(uuid)) {
disabledExtensions.push(uuid);
global.settings.set_strv(DISABLED_EXTENSIONS_KEY, disabledExtensions);
}
return true;
}
logExtensionError(uuid, error) {
let extension = this.lookup(uuid);
if (!extension)
return;
let message = `${error}`;
extension.error = message;
extension.state = ExtensionState.ERROR;
if (!extension.errors)
extension.errors = [];
extension.errors.push(message);
logError(error, `Extension ${uuid}`);
this.emit('extension-state-changed', extension);
}
createExtensionObject(uuid, dir, type) {
let metadataFile = dir.get_child('metadata.json');
if (!metadataFile.query_exists(null)) {
throw new Error('Missing metadata.json');
}
let metadataContents, success_;
try {
[success_, metadataContents] = metadataFile.load_contents(null);
if (metadataContents instanceof Uint8Array)
metadataContents = imports.byteArray.toString(metadataContents);
} catch (e) {
throw new Error(`Failed to load metadata.json: ${e}`);
}
let meta;
try {
meta = JSON.parse(metadataContents);
} catch (e) {
throw new Error(`Failed to parse metadata.json: ${e}`);
}
let requiredProperties = ['uuid', 'name', 'description', 'shell-version'];
for (let i = 0; i < requiredProperties.length; i++) {
let prop = requiredProperties[i];
if (!meta[prop]) {
throw new Error(`missing "${prop}" property in metadata.json`);
}
}
if (uuid != meta.uuid) {
throw new Error(`uuid "${meta.uuid}" from metadata.json does not match directory name "${uuid}"`);
}
let extension = {
metadata: meta,
uuid: meta.uuid,
type,
dir,
path: dir.get_path(),
error: '',
hasPrefs: dir.get_child('prefs.js').query_exists(null),
canChange: false
};
this._extensions.set(uuid, extension);
return extension;
}
loadExtension(extension) {
// Default to error, we set success as the last step
extension.state = ExtensionState.ERROR;
let checkVersion = !global.settings.get_boolean(EXTENSION_DISABLE_VERSION_CHECK_KEY);
if (checkVersion && ExtensionUtils.isOutOfDate(extension)) {
extension.state = ExtensionState.OUT_OF_DATE;
} else {
let enabled = this._enabledExtensions.includes(extension.uuid);
if (enabled) {
if (!this._callExtensionInit(extension.uuid))
return;
if (extension.state == ExtensionState.DISABLED)
this._callExtensionEnable(extension.uuid);
} else {
extension.state = ExtensionState.INITIALIZED;
}
}
this._updateCanChange(extension);
this.emit('extension-state-changed', extension);
}
unloadExtension(extension) {
// Try to disable it -- if it's ERROR'd, we can't guarantee that,
// but it will be removed on next reboot, and hopefully nothing
// broke too much.
this._callExtensionDisable(extension.uuid);
extension.state = ExtensionState.UNINSTALLED;
this.emit('extension-state-changed', extension);
this._extensions.delete(extension.uuid);
return true;
}
reloadExtension(oldExtension) {
// Grab the things we'll need to pass to createExtensionObject
// to reload it.
let { uuid: uuid, dir: dir, type: type } = oldExtension;
// Then unload the old extension.
this.unloadExtension(oldExtension);
// Now, recreate the extension and load it.
let newExtension;
try {
newExtension = this.createExtensionObject(uuid, dir, type);
} catch (e) {
this.logExtensionError(uuid, e);
return;
}
this.loadExtension(newExtension);
}
_callExtensionInit(uuid) {
if (!Main.sessionMode.allowExtensions)
return false;
let extension = this.lookup(uuid);
if (!extension)
throw new Error("Extension was not properly created. Call createExtensionObject first");
let dir = extension.dir;
let extensionJs = dir.get_child('extension.js');
if (!extensionJs.query_exists(null)) {
this.logExtensionError(uuid, new Error('Missing extension.js'));
return false;
}
let extensionModule;
let extensionState = null;
ExtensionUtils.installImporter(extension);
try {
extensionModule = extension.imports.extension;
} catch (e) {
this.logExtensionError(uuid, e);
return false;
}
if (extensionModule.init) {
try {
extensionState = extensionModule.init(extension);
} catch (e) {
this.logExtensionError(uuid, e);
return false;
}
}
if (!extensionState)
extensionState = extensionModule;
extension.stateObj = extensionState;
extension.state = ExtensionState.DISABLED;
this.emit('extension-loaded', uuid);
return true;
}
_getModeExtensions() {
if (Array.isArray(Main.sessionMode.enabledExtensions))
return Main.sessionMode.enabledExtensions;
return [];
}
_updateCanChange(extension) {
let hasError =
extension.state == ExtensionState.ERROR ||
extension.state == ExtensionState.OUT_OF_DATE;
let isMode = this._getModeExtensions().includes(extension.uuid);
let modeOnly = global.settings.get_boolean(DISABLE_USER_EXTENSIONS_KEY);
let changeKey = isMode
? DISABLE_USER_EXTENSIONS_KEY
: ENABLED_EXTENSIONS_KEY;
extension.canChange =
!hasError &&
global.settings.is_writable(changeKey) &&
(isMode || !modeOnly);
}
_getEnabledExtensions() {
let extensions = this._getModeExtensions();
if (!global.settings.get_boolean(DISABLE_USER_EXTENSIONS_KEY))
extensions = extensions.concat(global.settings.get_strv(ENABLED_EXTENSIONS_KEY));
// filter out 'disabled-extensions' which takes precedence
let disabledExtensions = global.settings.get_strv(DISABLED_EXTENSIONS_KEY);
return extensions.filter(item => !disabledExtensions.includes(item));
}
_onUserExtensionsEnabledChanged() {
this._onEnabledExtensionsChanged();
this._onSettingsWritableChanged();
}
_onEnabledExtensionsChanged() {
let newEnabledExtensions = this._getEnabledExtensions();
// Find and enable all the newly enabled extensions: UUIDs found in the
// new setting, but not in the old one.
newEnabledExtensions.filter(
uuid => !this._enabledExtensions.includes(uuid)
).forEach(uuid => {
this._callExtensionEnable(uuid);
});
// Find and disable all the newly disabled extensions: UUIDs found in the
// old setting, but not in the new one.
this._extensionOrder.filter(
uuid => !newEnabledExtensions.includes(uuid)
).reverse().forEach(uuid => {
this._callExtensionDisable(uuid);
});
this._enabledExtensions = newEnabledExtensions;
}
_onSettingsWritableChanged() {
for (let extension of this._extensions.values()) {
this._updateCanChange(extension);
this.emit('extension-state-changed', extension);
}
}
_onVersionValidationChanged() {
// Disabling extensions modifies the order array, so use a copy
let extensionOrder = this._extensionOrder.slice();
// Disable enabled extensions in the reverse order first to avoid
// the "rebasing" done in _callExtensionDisable...
extensionOrder.slice().reverse().forEach(uuid => {
this._callExtensionDisable(uuid);
});
// ...and then reload and enable extensions in the correct order again.
[...this._extensions.values()].sort((a, b) => {
return extensionOrder.indexOf(a.uuid) - extensionOrder.indexOf(b.uuid);
}).forEach(extension => this.reloadExtension(extension));
}
_loadExtensions() {
global.settings.connect(`changed::${ENABLED_EXTENSIONS_KEY}`,
this._onEnabledExtensionsChanged.bind(this));
global.settings.connect(`changed::${DISABLED_EXTENSIONS_KEY}`,
this._onEnabledExtensionsChanged.bind(this));
global.settings.connect(`changed::${DISABLE_USER_EXTENSIONS_KEY}`,
this._onUserExtensionsEnabledChanged.bind(this));
global.settings.connect(`changed::${EXTENSION_DISABLE_VERSION_CHECK_KEY}`,
this._onVersionValidationChanged.bind(this));
global.settings.connect(`writable-changed::${ENABLED_EXTENSIONS_KEY}`,
this._onSettingsWritableChanged.bind(this));
global.settings.connect(`writable-changed::${DISABLED_EXTENSIONS_KEY}`,
this._onSettingsWritableChanged.bind(this));
this._enabledExtensions = this._getEnabledExtensions();
let perUserDir = Gio.File.new_for_path(global.userdatadir);
FileUtils.collectFromDatadirs('extensions', true, (dir, info) => {
let fileType = info.get_file_type();
if (fileType != Gio.FileType.DIRECTORY)
return;
let uuid = info.get_name();
let existing = this.lookup(uuid);
if (existing) {
log(`Extension ${uuid} already installed in ${existing.path}. ${dir.get_path()} will not be loaded`);
return;
}
let extension;
let type = dir.has_prefix(perUserDir)
? ExtensionType.PER_USER
: ExtensionType.SYSTEM;
try {
extension = this.createExtensionObject(uuid, dir, type);
} catch (e) {
logError(e, `Could not load extension ${uuid}`);
return;
}
this.loadExtension(extension);
});
}
_enableAllExtensions() {
if (this._enabled)
return;
if (!this._initialized) {
this._loadExtensions();
this._initialized = true;
} else {
this._enabledExtensions.forEach(uuid => {
this._callExtensionEnable(uuid);
});
}
this._enabled = true;
}
_disableAllExtensions() {
if (!this._enabled)
return;
if (this._initialized) {
this._extensionOrder.slice().reverse().forEach(uuid => {
this._callExtensionDisable(uuid);
});
}
this._enabled = false;
}
_sessionUpdated() {
// For now sessionMode.allowExtensions controls extensions from both the
// 'enabled-extensions' preference and the sessionMode.enabledExtensions
// property; it might make sense to make enabledExtensions independent
// from allowExtensions in the future
if (Main.sessionMode.allowExtensions) {
// Take care of added or removed sessionMode extensions
this._onEnabledExtensionsChanged();
this._enableAllExtensions();
} else {
this._disableAllExtensions();
}
}
};
Signals.addSignalMethods(ExtensionManager.prototype);