зеркало из https://github.com/mozilla/gecko-dev.git
472 строки
16 KiB
JavaScript
472 строки
16 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
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Cu.import("resource://gre/modules/osfile.jsm");
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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Cu.import("resource://gre/modules/Services.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "FileUtils",
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"resource://gre/modules/FileUtils.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "JSONFile",
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"resource://gre/modules/JSONFile.jsm");
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XPCOMUtils.defineLazyServiceGetter(this, "gExternalProtocolService",
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"@mozilla.org/uriloader/external-protocol-service;1",
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"nsIExternalProtocolService");
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XPCOMUtils.defineLazyServiceGetter(this, "gHandlerServiceRDF",
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"@mozilla.org/uriloader/handler-service-rdf;1",
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"nsIHandlerService");
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XPCOMUtils.defineLazyServiceGetter(this, "gMIMEService",
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"@mozilla.org/mime;1",
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"nsIMIMEService");
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function HandlerService() {
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// Observe handlersvc-json-replace so we can switch to the datasource
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Services.obs.addObserver(this, "handlersvc-json-replace", true);
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}
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HandlerService.prototype = {
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classID: Components.ID("{220cc253-b60f-41f6-b9cf-fdcb325f970f}"),
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QueryInterface: XPCOMUtils.generateQI([
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Ci.nsISupportsWeakReference,
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Ci.nsIHandlerService,
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Ci.nsIObserver
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]),
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__store: null,
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get _store() {
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if (!this.__store) {
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this.__store = new JSONFile({
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path: OS.Path.join(OS.Constants.Path.profileDir, "handlers.json"),
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dataPostProcessor: this._dataPostProcessor.bind(this),
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});
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this.__store.ensureDataReady();
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// We have to inject new default protocol handlers only if we haven't
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// already done this when migrating data from the RDF back-end.
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let alreadyInjected = this._migrateFromRDFIfNeeded();
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this._injectDefaultProtocolHandlersIfNeeded(alreadyInjected);
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}
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return this.__store;
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},
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_dataPostProcessor(data) {
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return data.defaultHandlersVersion ? data : {
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defaultHandlersVersion: {},
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mimeTypes: {},
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schemes: {},
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};
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},
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/**
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* Migrates data from the RDF back-end, returning true if this happened.
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*/
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_migrateFromRDFIfNeeded() {
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try {
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if (Services.prefs.getBoolPref("gecko.handlerService.migrated")) {
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return false;
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}
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} catch (ex) {
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// If the preference does not exist, we need to import.
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}
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try {
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// Don't initialize the RDF back-end if the file does not exist, improving
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// performance on first use for new profiles.
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let rdfFile = FileUtils.getFile("ProfD", ["mimeTypes.rdf"]);
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if (rdfFile.exists()) {
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this._migrateFromRDF();
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return true;
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}
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} catch (ex) {
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Cu.reportError(ex);
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} finally {
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// Don't attempt to import again even if the operation failed.
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Services.prefs.setBoolPref("gecko.handlerService.migrated", true);
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}
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return false;
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},
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_migrateFromRDF() {
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// Initializing the RDF back-end has the side effect of triggering the
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// injection of the default protocol handlers. If the version number is
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// newer and this happens, then the "enumerate" call in the RDF back-end
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// will re-enter the JSON back-end through the MIME service, but this is
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// harmless. The injection will not be repeated in the JSON back-end, so we
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// rely on the new handlers injected by the RDF back-end.
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let handlerInfoEnumerator = gHandlerServiceRDF.enumerate();
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while (handlerInfoEnumerator.hasMoreElements()) {
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let handlerInfo = handlerInfoEnumerator.getNext()
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.QueryInterface(Ci.nsIHandlerInfo);
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try {
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// If the import from RDF is repeated by flipping the preference, then
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// handlerInfo might already include some data from the JSON back-end,
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// but any duplication is removed by the "store" method.
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gHandlerServiceRDF.fillHandlerInfo(handlerInfo, "");
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this.store(handlerInfo);
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} catch (ex) {
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Cu.reportError(ex);
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}
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}
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},
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/**
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* Injects new default protocol handlers if the version in the preferences is
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* newer than the one in the data store. If we just imported data from the RDF
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* back-end, we only need to update the version in the data store.
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*/
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_injectDefaultProtocolHandlersIfNeeded(alreadyInjected) {
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let prefsDefaultHandlersVersion;
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try {
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prefsDefaultHandlersVersion = Services.prefs.getComplexValue(
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"gecko.handlerService.defaultHandlersVersion",
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Ci.nsIPrefLocalizedString);
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} catch (ex) {
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if (ex instanceof Components.Exception &&
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ex.result == Cr.NS_ERROR_UNEXPECTED) {
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// This platform does not have any default protocol handlers configured.
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return;
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}
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throw ex;
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}
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try {
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prefsDefaultHandlersVersion = Number(prefsDefaultHandlersVersion.data);
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let locale = Services.locale.getAppLocaleAsLangTag();
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let defaultHandlersVersion =
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this._store.data.defaultHandlersVersion[locale] || 0;
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if (defaultHandlersVersion < prefsDefaultHandlersVersion) {
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if (!alreadyInjected) {
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this._injectDefaultProtocolHandlers();
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}
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this._store.data.defaultHandlersVersion[locale] =
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prefsDefaultHandlersVersion;
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}
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} catch (ex) {
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Cu.reportError(ex);
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}
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},
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_injectDefaultProtocolHandlers() {
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let schemesPrefBranch = Services.prefs.getBranch("gecko.handlerService.schemes.");
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let schemePrefList = schemesPrefBranch.getChildList("");
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let schemes = {};
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// read all the scheme prefs into a hash
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for (let schemePrefName of schemePrefList) {
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let [scheme, handlerNumber, attribute] = schemePrefName.split(".");
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try {
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let attrData =
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schemesPrefBranch.getComplexValue(schemePrefName,
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Ci.nsIPrefLocalizedString).data;
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if (!(scheme in schemes)) {
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schemes[scheme] = {};
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}
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if (!(handlerNumber in schemes[scheme])) {
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schemes[scheme][handlerNumber] = {};
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}
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schemes[scheme][handlerNumber][attribute] = attrData;
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} catch (ex) {}
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}
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for (let scheme of Object.keys(schemes)) {
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// This clause is essentially a reimplementation of
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// nsIExternalProtocolHandlerService.getProtocolHandlerInfo().
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// Necessary because we want to use this instance of the service,
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// but nsIExternalProtocolHandlerService would call the RDF-based based version
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// until we complete the conversion.
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let osDefaultHandlerFound = {};
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let protoInfo = gExternalProtocolService.getProtocolHandlerInfoFromOS(scheme,
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osDefaultHandlerFound);
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if (this.exists(protoInfo)) {
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this.fillHandlerInfo(protoInfo, null);
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} else {
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gExternalProtocolService.setProtocolHandlerDefaults(protoInfo,
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osDefaultHandlerFound.value);
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}
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// cache the possible handlers to avoid extra xpconnect traversals.
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let possibleHandlers = protoInfo.possibleApplicationHandlers;
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for (let handlerNumber of Object.keys(schemes[scheme])) {
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let handlerApp = this.handlerAppFromSerializable(schemes[scheme][handlerNumber]);
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// If there is already a handler registered with the same template
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// URL, the newly added one will be ignored when saving.
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possibleHandlers.appendElement(handlerApp, false);
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}
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this.store(protoInfo);
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}
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},
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_onDBChange() {
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return (async () => {
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if (this.__store) {
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await this.__store.finalize();
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}
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this.__store = null;
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})().catch(Cu.reportError);
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},
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// nsIObserver
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observe(subject, topic, data) {
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if (topic != "handlersvc-json-replace") {
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return;
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}
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let promise = this._onDBChange();
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promise.then(() => {
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Services.obs.notifyObservers(null, "handlersvc-json-replace-complete");
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});
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},
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// nsIHandlerService
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enumerate() {
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let handlers = Cc["@mozilla.org/array;1"]
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.createInstance(Ci.nsIMutableArray);
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for (let type of Object.keys(this._store.data.mimeTypes)) {
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let handler = gMIMEService.getFromTypeAndExtension(type, null);
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handlers.appendElement(handler);
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}
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for (let type of Object.keys(this._store.data.schemes)) {
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let handler = gExternalProtocolService.getProtocolHandlerInfo(type);
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handlers.appendElement(handler);
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}
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return handlers.enumerate();
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},
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// nsIHandlerService
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store(handlerInfo) {
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let handlerList = this._getHandlerListByHandlerInfoType(handlerInfo);
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// Retrieve an existing entry if present, instead of creating a new one, so
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// that we preserve unknown properties for forward compatibility.
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let storedHandlerInfo = handlerList[handlerInfo.type];
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if (!storedHandlerInfo) {
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storedHandlerInfo = {};
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handlerList[handlerInfo.type] = storedHandlerInfo;
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}
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// Only a limited number of preferredAction values is allowed.
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if (handlerInfo.preferredAction == Ci.nsIHandlerInfo.saveToDisk ||
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handlerInfo.preferredAction == Ci.nsIHandlerInfo.useSystemDefault ||
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handlerInfo.preferredAction == Ci.nsIHandlerInfo.handleInternally) {
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storedHandlerInfo.action = handlerInfo.preferredAction;
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} else {
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storedHandlerInfo.action = Ci.nsIHandlerInfo.useHelperApp;
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}
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if (handlerInfo.alwaysAskBeforeHandling) {
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storedHandlerInfo.ask = true;
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} else {
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delete storedHandlerInfo.ask;
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}
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// Build a list of unique nsIHandlerInfo instances to process later.
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let handlers = [];
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if (handlerInfo.preferredApplicationHandler) {
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handlers.push(handlerInfo.preferredApplicationHandler);
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}
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let enumerator = handlerInfo.possibleApplicationHandlers.enumerate();
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while (enumerator.hasMoreElements()) {
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let handler = enumerator.getNext().QueryInterface(Ci.nsIHandlerApp);
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// If the caller stored duplicate handlers, we save them only once.
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if (!handlers.some(h => h.equals(handler))) {
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handlers.push(handler);
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}
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}
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// If any of the nsIHandlerInfo instances cannot be serialized, it is not
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// included in the final list. The first element is always the preferred
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// handler, or null if there is none.
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let serializableHandlers =
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handlers.map(h => this.handlerAppToSerializable(h)).filter(h => h);
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if (serializableHandlers.length) {
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if (!handlerInfo.preferredApplicationHandler) {
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serializableHandlers.unshift(null);
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}
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storedHandlerInfo.handlers = serializableHandlers;
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} else {
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delete storedHandlerInfo.handlers;
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}
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if (this._isMIMEInfo(handlerInfo)) {
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let extEnumerator = handlerInfo.getFileExtensions();
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let extensions = storedHandlerInfo.extensions || [];
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while (extEnumerator.hasMore()) {
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let extension = extEnumerator.getNext().toLowerCase();
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// If the caller stored duplicate extensions, we save them only once.
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if (!extensions.includes(extension)) {
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extensions.push(extension);
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}
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}
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if (extensions.length) {
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storedHandlerInfo.extensions = extensions;
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} else {
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delete storedHandlerInfo.extensions;
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}
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}
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this._store.saveSoon();
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},
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// nsIHandlerService
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fillHandlerInfo(handlerInfo, overrideType) {
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let type = overrideType || handlerInfo.type;
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let storedHandlerInfo = this._getHandlerListByHandlerInfoType(handlerInfo)[type];
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if (!storedHandlerInfo) {
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throw new Components.Exception("handlerSvc fillHandlerInfo: don't know this type",
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Cr.NS_ERROR_NOT_AVAILABLE);
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}
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handlerInfo.preferredAction = storedHandlerInfo.action;
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handlerInfo.alwaysAskBeforeHandling = !!storedHandlerInfo.ask;
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// If the first item is not null, it is also the preferred handler. Since
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// we cannot modify the stored array, use a boolean to keep track of this.
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let isFirstItem = true;
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for (let handler of storedHandlerInfo.handlers || [null]) {
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let handlerApp = this.handlerAppFromSerializable(handler || {});
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if (isFirstItem) {
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isFirstItem = false;
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handlerInfo.preferredApplicationHandler = handlerApp;
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}
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if (handlerApp) {
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handlerInfo.possibleApplicationHandlers.appendElement(handlerApp);
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}
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}
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if (this._isMIMEInfo(handlerInfo) && storedHandlerInfo.extensions) {
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for (let extension of storedHandlerInfo.extensions) {
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handlerInfo.appendExtension(extension);
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}
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}
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},
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/**
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* @param handler
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* A nsIHandlerApp handler app
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* @returns Serializable representation of a handler app object.
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*/
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handlerAppToSerializable(handler) {
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if (handler instanceof Ci.nsILocalHandlerApp) {
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return {
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name: handler.name,
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path: handler.executable.path,
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};
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} else if (handler instanceof Ci.nsIWebHandlerApp) {
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return {
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name: handler.name,
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uriTemplate: handler.uriTemplate,
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};
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} else if (handler instanceof Ci.nsIDBusHandlerApp) {
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return {
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name: handler.name,
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service: handler.service,
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method: handler.method,
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objectPath: handler.objectPath,
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dBusInterface: handler.dBusInterface,
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};
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}
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// If the handler is an unknown handler type, return null.
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// Android default application handler is the case.
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return null;
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},
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/**
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* @param handlerObj
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* Serializable representation of a handler object.
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* @returns {nsIHandlerApp} the handler app, if any; otherwise null
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*/
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handlerAppFromSerializable(handlerObj) {
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let handlerApp;
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if ("path" in handlerObj) {
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try {
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let file = new FileUtils.File(handlerObj.path);
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if (!file.exists()) {
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return null;
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}
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handlerApp = Cc["@mozilla.org/uriloader/local-handler-app;1"]
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.createInstance(Ci.nsILocalHandlerApp);
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handlerApp.executable = file;
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} catch (ex) {
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return null;
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}
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} else if ("uriTemplate" in handlerObj) {
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handlerApp = Cc["@mozilla.org/uriloader/web-handler-app;1"]
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.createInstance(Ci.nsIWebHandlerApp);
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handlerApp.uriTemplate = handlerObj.uriTemplate;
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} else if ("service" in handlerObj) {
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handlerApp = Cc["@mozilla.org/uriloader/dbus-handler-app;1"]
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.createInstance(Ci.nsIDBusHandlerApp);
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handlerApp.service = handlerObj.service;
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handlerApp.method = handlerObj.method;
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handlerApp.objectPath = handlerObj.objectPath;
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handlerApp.dBusInterface = handlerObj.dBusInterface;
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} else {
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return null;
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}
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handlerApp.name = handlerObj.name;
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return handlerApp;
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},
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/**
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* The function returns a reference to the "mimeTypes" or "schemes" object
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* based on which type of handlerInfo is provided.
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*/
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_getHandlerListByHandlerInfoType(handlerInfo) {
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return this._isMIMEInfo(handlerInfo) ? this._store.data.mimeTypes
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: this._store.data.schemes;
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},
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/**
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* Determines whether an nsIHandlerInfo instance represents a MIME type.
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*/
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_isMIMEInfo(handlerInfo) {
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// We cannot rely only on the instanceof check because on Android both MIME
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// types and protocols are instances of nsIMIMEInfo. We still do the check
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// so that properties of nsIMIMEInfo become available to the callers.
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return handlerInfo instanceof Ci.nsIMIMEInfo &&
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handlerInfo.type.includes("/");
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},
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// nsIHandlerService
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exists(handlerInfo) {
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return handlerInfo.type in this._getHandlerListByHandlerInfoType(handlerInfo);
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},
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// nsIHandlerService
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remove(handlerInfo) {
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delete this._getHandlerListByHandlerInfoType(handlerInfo)[handlerInfo.type];
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this._store.saveSoon();
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},
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// nsIHandlerService
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getTypeFromExtension(fileExtension) {
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let extension = fileExtension.toLowerCase();
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let mimeTypes = this._store.data.mimeTypes;
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for (let type of Object.keys(mimeTypes)) {
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if (mimeTypes[type].extensions &&
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mimeTypes[type].extensions.includes(extension)) {
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return type;
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}
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}
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return "";
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},
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};
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this.NSGetFactory = XPCOMUtils.generateNSGetFactory([HandlerService]);
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