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-rw-r--r--js/misc/extensionUtils.js268
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diff --git a/js/misc/extensionUtils.js b/js/misc/extensionUtils.js
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+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+/* exported ExtensionState, ExtensionType, getCurrentExtension,
+ getSettings, initTranslations, openPrefs, isOutOfDate,
+ installImporter, serializeExtension, deserializeExtension */
+
+// Common utils for the extension system and the extension
+// preferences tool
+
+const { Gio, GLib } = imports.gi;
+
+const Gettext = imports.gettext;
+const Lang = imports.lang;
+
+const Config = imports.misc.config;
+
+var ExtensionType = {
+ SYSTEM: 1,
+ PER_USER: 2,
+};
+
+var ExtensionState = {
+ ENABLED: 1,
+ DISABLED: 2,
+ ERROR: 3,
+ OUT_OF_DATE: 4,
+ DOWNLOADING: 5,
+ INITIALIZED: 6,
+
+ // Used as an error state for operations on unknown extensions,
+ // should never be in a real extensionMeta object.
+ UNINSTALLED: 99,
+};
+
+const SERIALIZED_PROPERTIES = [
+ 'type',
+ 'state',
+ 'path',
+ 'error',
+ 'hasPrefs',
+ 'hasUpdate',
+ 'canChange',
+];
+
+/**
+ * getCurrentExtension:
+ *
+ * @returns {?object} - The current extension, or null if not called from
+ * an extension.
+ */
+function getCurrentExtension() {
+ let stack = new Error().stack.split('\n');
+ let extensionStackLine;
+
+ // Search for an occurrence of an extension stack frame
+ // Start at 1 because 0 is the stack frame of this function
+ for (let i = 1; i < stack.length; i++) {
+ if (stack[i].includes('/gnome-shell/extensions/')) {
+ extensionStackLine = stack[i];
+ break;
+ }
+ }
+ if (!extensionStackLine)
+ return null;
+
+ // The stack line is like:
+ // init([object Object])@/home/user/data/gnome-shell/extensions/u@u.id/prefs.js:8
+ //
+ // In the case that we're importing from
+ // module scope, the first field is blank:
+ // @/home/user/data/gnome-shell/extensions/u@u.id/prefs.js:8
+ let match = new RegExp('@(.+):\\d+').exec(extensionStackLine);
+ if (!match)
+ return null;
+
+ // local import, as the module is used from outside the gnome-shell process
+ // as well (not this function though)
+ let extensionManager = imports.ui.main.extensionManager;
+
+ let path = match[1];
+ let file = Gio.File.new_for_path(path);
+
+ // Walk up the directory tree, looking for an extension with
+ // the same UUID as a directory name.
+ while (file != null) {
+ let extension = extensionManager.lookup(file.get_basename());
+ if (extension !== undefined)
+ return extension;
+ file = file.get_parent();
+ }
+
+ return null;
+}
+
+/**
+ * initTranslations:
+ * @param {string=} domain - the gettext domain to use
+ *
+ * Initialize Gettext to load translations from extensionsdir/locale.
+ * If @domain is not provided, it will be taken from metadata['gettext-domain']
+ */
+function initTranslations(domain) {
+ let extension = getCurrentExtension();
+
+ if (!extension)
+ throw new Error('initTranslations() can only be called from extensions');
+
+ domain = domain || extension.metadata['gettext-domain'];
+
+ // Expect USER extensions to have a locale/ subfolder, otherwise assume a
+ // SYSTEM extension that has been installed in the same prefix as the shell
+ let localeDir = extension.dir.get_child('locale');
+ if (localeDir.query_exists(null))
+ Gettext.bindtextdomain(domain, localeDir.get_path());
+ else
+ Gettext.bindtextdomain(domain, Config.LOCALEDIR);
+}
+
+/**
+ * getSettings:
+ * @param {string=} schema - the GSettings schema id
+ * @returns {Gio.Settings} - a new settings object for @schema
+ *
+ * Builds and returns a GSettings schema for @schema, using schema files
+ * in extensionsdir/schemas. If @schema is omitted, it is taken from
+ * metadata['settings-schema'].
+ */
+function getSettings(schema) {
+ let extension = getCurrentExtension();
+
+ if (!extension)
+ throw new Error('getSettings() can only be called from extensions');
+
+ schema = schema || extension.metadata['settings-schema'];
+
+ const GioSSS = Gio.SettingsSchemaSource;
+
+ // Expect USER extensions to have a schemas/ subfolder, otherwise assume a
+ // SYSTEM extension that has been installed in the same prefix as the shell
+ let schemaDir = extension.dir.get_child('schemas');
+ let schemaSource;
+ if (schemaDir.query_exists(null)) {
+ schemaSource = GioSSS.new_from_directory(schemaDir.get_path(),
+ GioSSS.get_default(),
+ false);
+ } else {
+ schemaSource = GioSSS.get_default();
+ }
+
+ let schemaObj = schemaSource.lookup(schema, true);
+ if (!schemaObj)
+ throw new Error(`Schema ${schema} could not be found for extension ${extension.metadata.uuid}. Please check your installation`);
+
+ return new Gio.Settings({ settings_schema: schemaObj });
+}
+
+/**
+ * openPrefs:
+ *
+ * Open the preference dialog of the current extension
+ */
+function openPrefs() {
+ const extension = getCurrentExtension();
+
+ if (!extension)
+ throw new Error('openPrefs() can only be called from extensions');
+
+ try {
+ const extensionManager = imports.ui.main.extensionManager;
+ extensionManager.openExtensionPrefs(extension.uuid, '', {});
+ } catch (e) {
+ if (e.name === 'ImportError')
+ throw new Error('openPrefs() cannot be called from preferences');
+ logError(e, 'Failed to open extension preferences');
+ }
+}
+
+/**
+ * versionCheck:
+ * @param {string[]} required - an array of versions we're compatible with
+ * @param {string} current - the version we have
+ * @returns {bool} - true if @current is compatible with @required
+ *
+ * Check if a component is compatible for an extension.
+ * @required is an array, and at least one version must match.
+ * @current must be in the format <major>.<minor>.<point>.<micro>
+ * <micro> is always ignored
+ * <point> is ignored if <minor> is even (so you can target the
+ * whole stable release)
+ * <minor> and <major> must match
+ * Each target version must be at least <major> and <minor>
+ */
+function versionCheck(required, current) {
+ let currentArray = current.split('.');
+ let major = currentArray[0];
+ let minor = currentArray[1];
+ let point = currentArray[2];
+ for (let i = 0; i < required.length; i++) {
+ let requiredArray = required[i].split('.');
+ if (requiredArray[0] == major &&
+ requiredArray[1] == minor &&
+ ((requiredArray[2] === undefined && parseInt(minor) % 2 == 0) ||
+ requiredArray[2] == point))
+ return true;
+ }
+ return false;
+}
+
+function isOutOfDate(extension) {
+ if (!versionCheck(extension.metadata['shell-version'], Config.PACKAGE_VERSION))
+ return true;
+
+ return false;
+}
+
+function serializeExtension(extension) {
+ let obj = {};
+ Lang.copyProperties(extension.metadata, obj);
+
+ SERIALIZED_PROPERTIES.forEach(prop => {
+ obj[prop] = extension[prop];
+ });
+
+ let res = {};
+ for (let key in obj) {
+ let val = obj[key];
+ let type;
+ switch (typeof val) {
+ case 'string':
+ type = 's';
+ break;
+ case 'number':
+ type = 'd';
+ break;
+ case 'boolean':
+ type = 'b';
+ break;
+ default:
+ continue;
+ }
+ res[key] = GLib.Variant.new(type, val);
+ }
+
+ return res;
+}
+
+function deserializeExtension(variant) {
+ let res = { metadata: {} };
+ for (let prop in variant) {
+ let val = variant[prop].unpack();
+ if (SERIALIZED_PROPERTIES.includes(prop))
+ res[prop] = val;
+ else
+ res.metadata[prop] = val;
+ }
+ // add the 2 additional properties to create a valid extension object, as createExtensionObject()
+ res.uuid = res.metadata.uuid;
+ res.dir = Gio.File.new_for_path(res.path);
+ return res;
+}
+
+function installImporter(extension) {
+ let oldSearchPath = imports.searchPath.slice(); // make a copy
+ imports.searchPath = [extension.dir.get_parent().get_path()];
+ // importing a "subdir" creates a new importer object that doesn't affect
+ // the global one
+ extension.imports = imports[extension.uuid];
+ imports.searchPath = oldSearchPath;
+}
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