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Diffstat (limited to 'browser/components/feeds/WebContentConverter.js')
| -rw-r--r-- | browser/components/feeds/WebContentConverter.js | 927 |
1 files changed, 927 insertions, 0 deletions
diff --git a/browser/components/feeds/WebContentConverter.js b/browser/components/feeds/WebContentConverter.js new file mode 100644 index 000000000..a6b144c65 --- /dev/null +++ b/browser/components/feeds/WebContentConverter.js @@ -0,0 +1,927 @@ +/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +Components.utils.import("resource://gre/modules/XPCOMUtils.jsm"); +Components.utils.import("resource://gre/modules/PrivateBrowsingUtils.jsm"); + +const Cc = Components.classes; +const Ci = Components.interfaces; +const Cr = Components.results; + +function LOG(str) { + dump("*** " + str + "\n"); +} + +const WCCR_CONTRACTID = "@mozilla.org/embeddor.implemented/web-content-handler-registrar;1"; +const WCCR_CLASSID = Components.ID("{792a7e82-06a0-437c-af63-b2d12e808acc}"); + +const WCC_CLASSID = Components.ID("{db7ebf28-cc40-415f-8a51-1b111851df1e}"); +const WCC_CLASSNAME = "Web Service Handler"; + +const TYPE_MAYBE_FEED = "application/vnd.mozilla.maybe.feed"; +const TYPE_ANY = "*/*"; +const TYPE_BLACKLIST = [ + "application/x-www-form-urlencoded", + "application/xhtml+xml", + "application/xml", + "application/mathml+xml", + "application/xslt+xml", + "application/x-xpinstall", + "image/gif", + "image/jpg", + "image/jpeg", + "image/png", + "image/x-png", + "image/webp", +#ifdef MOZ_JXR + "image/jxr", + "image/vnd.ms-photo", +#endif + "image/svg+xml", + "image/bmp", + "image/x-ms-bmp", + "image/icon", + "image/x-icon", + "image/vnd.microsoft.icon", + "multipart/x-mixed-replace", + "multipart/form-data", + "text/cache-manifest", + "text/css", + "text/xsl", + "text/html", + "text/ping", + "text/plain", + "text/xml", + "text/javascript", // To prevent malicious intent blocking scripting. + "text/ecmascript"]; + +const PREF_CONTENTHANDLERS_AUTO = "browser.contentHandlers.auto."; +const PREF_CONTENTHANDLERS_BRANCH = "browser.contentHandlers.types."; +const PREF_SELECTED_WEB = "browser.feeds.handlers.webservice"; +const PREF_SELECTED_ACTION = "browser.feeds.handler"; +const PREF_SELECTED_READER = "browser.feeds.handler.default"; +const PREF_HANDLER_EXTERNAL_PREFIX = "network.protocol-handler.external"; +const PREF_ALLOW_DIFFERENT_HOST = "gecko.handlerService.allowRegisterFromDifferentHost"; + +const STRING_BUNDLE_URI = "chrome://browser/locale/feeds/subscribe.properties"; + +const NS_ERROR_MODULE_DOM = 2152923136; +const NS_ERROR_DOM_SYNTAX_ERR = NS_ERROR_MODULE_DOM + 12; + +function WebContentConverter() { +} +WebContentConverter.prototype = { + convert: function() { }, + asyncConvertData: function() { }, + onDataAvailable: function() { }, + onStopRequest: function() { }, + + onStartRequest: function(request, context) { + var wccr = + Cc[WCCR_CONTRACTID]. + getService(Ci.nsIWebContentConverterService); + wccr.loadPreferredHandler(request); + }, + + QueryInterface: function(iid) { + if (iid.equals(Ci.nsIStreamConverter) || + iid.equals(Ci.nsIStreamListener) || + iid.equals(Ci.nsISupports)) + return this; + throw Cr.NS_ERROR_NO_INTERFACE; + } +}; + +var WebContentConverterFactory = { + createInstance: function(outer, iid) { + if (outer != null) + throw Cr.NS_ERROR_NO_AGGREGATION; + return new WebContentConverter().QueryInterface(iid); + }, + + QueryInterface: function(iid) { + if (iid.equals(Ci.nsIFactory) || + iid.equals(Ci.nsISupports)) + return this; + throw Cr.NS_ERROR_NO_INTERFACE; + } +}; + +function ServiceInfo(contentType, uri, name) { + this._contentType = contentType; + this._uri = uri; + this._name = name; +} +ServiceInfo.prototype = { + /** + * See nsIHandlerApp + */ + get name() { + return this._name; + }, + + /** + * See nsIHandlerApp + */ + equals: function(aHandlerApp) { + if (!aHandlerApp) + throw Cr.NS_ERROR_NULL_POINTER; + + if (aHandlerApp instanceof Ci.nsIWebContentHandlerInfo && + aHandlerApp.contentType == this.contentType && + aHandlerApp.uri == this.uri) + return true; + + return false; + }, + + /** + * See nsIWebContentHandlerInfo + */ + get contentType() { + return this._contentType; + }, + + /** + * See nsIWebContentHandlerInfo + */ + get uri() { + return this._uri; + }, + + /** + * See nsIWebContentHandlerInfo + */ + getHandlerURI: function(uri) { + return this._uri.replace(/%s/gi, encodeURIComponent(uri)); + }, + + QueryInterface: function(iid) { + if (iid.equals(Ci.nsIWebContentHandlerInfo) || + iid.equals(Ci.nsISupports)) + return this; + throw Cr.NS_ERROR_NO_INTERFACE; + } +}; + +function WebContentConverterRegistrar() { + this._contentTypes = { }; + this._autoHandleContentTypes = { }; +} + +WebContentConverterRegistrar.prototype = { + get stringBundle() { + var sb = Cc["@mozilla.org/intl/stringbundle;1"]. + getService(Ci.nsIStringBundleService). + createBundle(STRING_BUNDLE_URI); + delete WebContentConverterRegistrar.prototype.stringBundle; + return WebContentConverterRegistrar.prototype.stringBundle = sb; + }, + + _getFormattedString: function(key, params) { + return this.stringBundle.formatStringFromName(key, params, params.length); + }, + + _getString: function(key) { + return this.stringBundle.GetStringFromName(key); + }, + + /** + * See nsIWebContentConverterService + */ + getAutoHandler: + function(contentType) { + contentType = this._resolveContentType(contentType); + if (contentType in this._autoHandleContentTypes) + return this._autoHandleContentTypes[contentType]; + return null; + }, + + /** + * See nsIWebContentConverterService + */ + setAutoHandler: + function(contentType, handler) { + if (handler && !this._typeIsRegistered(contentType, handler.uri)) + throw Cr.NS_ERROR_NOT_AVAILABLE; + + contentType = this._resolveContentType(contentType); + this._setAutoHandler(contentType, handler); + + var ps = + Cc["@mozilla.org/preferences-service;1"]. + getService(Ci.nsIPrefService); + var autoBranch = ps.getBranch(PREF_CONTENTHANDLERS_AUTO); + if (handler) + autoBranch.setCharPref(contentType, handler.uri); + else if (autoBranch.prefHasUserValue(contentType)) + autoBranch.clearUserPref(contentType); + + ps.savePrefFile(null); + }, + + /** + * Update the internal data structure (not persistent) + */ + _setAutoHandler: + function(contentType, handler) { + if (handler) + this._autoHandleContentTypes[contentType] = handler; + else if (contentType in this._autoHandleContentTypes) + delete this._autoHandleContentTypes[contentType]; + }, + + /** + * See nsIWebContentConverterService + */ + getWebContentHandlerByURI: + function(contentType, uri) { + var handlers = this.getContentHandlers(contentType, { }); + for (var i = 0; i < handlers.length; ++i) { + if (handlers[i].uri == uri) + return handlers[i]; + } + return null; + }, + + /** + * See nsIWebContentConverterService + */ + loadPreferredHandler: + function(request) { + var channel = request.QueryInterface(Ci.nsIChannel); + var contentType = this._resolveContentType(channel.contentType); + var handler = this.getAutoHandler(contentType); + if (handler) { + request.cancel(Cr.NS_ERROR_FAILURE); + + var webNavigation = + channel.notificationCallbacks.getInterface(Ci.nsIWebNavigation); + webNavigation.loadURI(handler.getHandlerURI(channel.URI.spec), + Ci.nsIWebNavigation.LOAD_FLAGS_NONE, + null, null, null); + } + }, + + /** + * See nsIWebContentConverterService + */ + removeProtocolHandler: + function(aProtocol, aURITemplate) { + var eps = Cc["@mozilla.org/uriloader/external-protocol-service;1"]. + getService(Ci.nsIExternalProtocolService); + var handlerInfo = eps.getProtocolHandlerInfo(aProtocol); + var handlers = handlerInfo.possibleApplicationHandlers; + for (let i = 0; i < handlers.length; i++) { + try { // We only want to test web handlers + let handler = handlers.queryElementAt(i, Ci.nsIWebHandlerApp); + if (handler.uriTemplate == aURITemplate) { + handlers.removeElementAt(i); + var hs = Cc["@mozilla.org/uriloader/handler-service;1"]. + getService(Ci.nsIHandlerService); + hs.store(handlerInfo); + return; + } + } catch (e) { /* it wasn't a web handler */ } + } + }, + + /** + * See nsIWebContentConverterService + */ + removeContentHandler: + function(contentType, uri) { + function notURI(serviceInfo) { + return serviceInfo.uri != uri; + } + + if (contentType in this._contentTypes) { + this._contentTypes[contentType] = + this._contentTypes[contentType].filter(notURI); + } + }, + + /** + * + */ + _mappings: { + "application/rss+xml": TYPE_MAYBE_FEED, + "application/atom+xml": TYPE_MAYBE_FEED, + }, + + /** + * These are types for which there is a separate content converter aside + * from our built in generic one. We should not automatically register + * a factory for creating a converter for these types. + */ + _blockedTypes: { + "application/vnd.mozilla.maybe.feed": true, + }, + + /** + * Determines the "internal" content type based on the _mappings. + * @param contentType + * @returns The resolved contentType value. + */ + _resolveContentType: + function(contentType) { + if (contentType in this._mappings) + return this._mappings[contentType]; + return contentType; + }, + + _makeURI: function(aURL, aOriginCharset, aBaseURI) { + var ioService = Components.classes["@mozilla.org/network/io-service;1"] + .getService(Components.interfaces.nsIIOService); + return ioService.newURI(aURL, aOriginCharset, aBaseURI); + }, + + _checkAndGetURI: + function(aURIString, aContentWindow) + { + try { + let baseURI = aContentWindow.document.baseURIObject; + var uri = this._makeURI(aURIString, null, baseURI); + } catch (ex) { + // not supposed to throw according to spec + return; + } + + // For security reasons we reject non-http(s) urls (see bug 354316), + // we may need to revise this once we support more content types + // XXX this should be a "security exception" according to spec, but that + // isn't defined yet. + if (uri.scheme != "http" && uri.scheme != "https") + throw("Permission denied to add " + uri.spec + " as a content or protocol handler"); + + // We also reject handlers registered from a different host (see bug 402287) + // The pref allows us to test the feature + var pb = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch); + if (!pb.getBoolPref(PREF_ALLOW_DIFFERENT_HOST) && + (!["http:", "https:"].includes(aContentWindow.location.protocol) || + aContentWindow.location.hostname != uri.host)) { + throw("Permission denied to add " + uri.spec + " as a content or protocol handler"); + } + + // If the uri doesn't contain '%s', it won't be a good handler + if (uri.spec.indexOf("%s") < 0) + throw NS_ERROR_DOM_SYNTAX_ERR; + + return uri; + }, + + /** + * Determines if a web handler is already registered. + * + * @param aProtocol + * The scheme of the web handler we are checking for. + * @param aURITemplate + * The URI template that the handler uses to handle the protocol. + * @return true if it is already registered, false otherwise. + */ + _protocolHandlerRegistered: + function(aProtocol, aURITemplate) { + var eps = Cc["@mozilla.org/uriloader/external-protocol-service;1"]. + getService(Ci.nsIExternalProtocolService); + var handlerInfo = eps.getProtocolHandlerInfo(aProtocol); + var handlers = handlerInfo.possibleApplicationHandlers; + for (let i = 0; i < handlers.length; i++) { + try { // We only want to test web handlers + let handler = handlers.queryElementAt(i, Ci.nsIWebHandlerApp); + if (handler.uriTemplate == aURITemplate) + return true; + } catch (e) { /* it wasn't a web handler */ } + } + return false; + }, + + /** + * See nsIWebContentHandlerRegistrar + */ + registerProtocolHandler: + function(aProtocol, aURIString, aTitle, aContentWindow) { + LOG("registerProtocolHandler(" + aProtocol + "," + aURIString + "," + aTitle + ")"); + + var uri = this._checkAndGetURI(aURIString, aContentWindow); + + // If the protocol handler is already registered, just return early. + if (this._protocolHandlerRegistered(aProtocol, uri.spec)) { + return; + } + + var browserWindow = this._getBrowserWindowForContentWindow(aContentWindow); + if (PrivateBrowsingUtils.isWindowPrivate(browserWindow)) { + // Inside the private browsing mode, we don't want to alert the user to save + // a protocol handler. We log it to the error console so that web developers + // would have some way to tell what's going wrong. + Cc["@mozilla.org/consoleservice;1"]. + getService(Ci.nsIConsoleService). + logStringMessage("Web page denied access to register a protocol handler inside private browsing mode"); + return; + } + + // First, check to make sure this isn't already handled internally (we don't + // want to let them take over, say "chrome"). + var ios = Cc["@mozilla.org/network/io-service;1"]. + getService(Ci.nsIIOService); + var handler = ios.getProtocolHandler(aProtocol); + if (!(handler instanceof Ci.nsIExternalProtocolHandler)) { + // This is handled internally, so we don't want them to register + // XXX this should be a "security exception" according to spec, but that + // isn't defined yet. + throw("Permission denied to add " + aURIString + "as a protocol handler"); + } + + // check if it is in the black list + var pb = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch); + var allowed = pb.getBoolPref(PREF_HANDLER_EXTERNAL_PREFIX + "." + aProtocol, + pb.getBoolPref(PREF_HANDLER_EXTERNAL_PREFIX + "-default")); + if (!allowed) { + // XXX this should be a "security exception" according to spec + throw("Not allowed to register a protocol handler for " + aProtocol); + } + + // Now Ask the user and provide the proper callback + var message = this._getFormattedString("addProtocolHandler", + [aTitle, uri.host, aProtocol]); + + var notificationIcon = uri.prePath + "/favicon.ico"; + var notificationValue = "Protocol Registration: " + aProtocol; + var addButton = { + label: this._getString("addProtocolHandlerAddButton"), + accessKey: this._getString("addHandlerAddButtonAccesskey"), + protocolInfo: { protocol: aProtocol, uri: uri.spec, name: aTitle }, + + callback: + function(aNotification, aButtonInfo) { + var protocol = aButtonInfo.protocolInfo.protocol; + var uri = aButtonInfo.protocolInfo.uri; + var name = aButtonInfo.protocolInfo.name; + + var handler = Cc["@mozilla.org/uriloader/web-handler-app;1"]. + createInstance(Ci.nsIWebHandlerApp); + handler.name = name; + handler.uriTemplate = uri; + + var eps = Cc["@mozilla.org/uriloader/external-protocol-service;1"]. + getService(Ci.nsIExternalProtocolService); + var handlerInfo = eps.getProtocolHandlerInfo(protocol); + handlerInfo.possibleApplicationHandlers.appendElement(handler, false); + + // Since the user has agreed to add a new handler, chances are good + // that the next time they see a handler of this type, they're going + // to want to use it. Reset the handlerInfo to ask before the next + // use. + handlerInfo.alwaysAskBeforeHandling = true; + + var hs = Cc["@mozilla.org/uriloader/handler-service;1"]. + getService(Ci.nsIHandlerService); + hs.store(handlerInfo); + } + }; + var browserElement = this._getBrowserForContentWindow(browserWindow, aContentWindow); + var notificationBox = browserWindow.gBrowser.getNotificationBox(browserElement); + notificationBox.appendNotification(message, + notificationValue, + notificationIcon, + notificationBox.PRIORITY_INFO_LOW, + [addButton]); + }, + + /** + * See nsIWebContentHandlerRegistrar + * If a DOM window is provided, then the request came from content, so we + * prompt the user to confirm the registration. + */ + registerContentHandler: + function(aContentType, aURIString, aTitle, aContentWindow) { + LOG("registerContentHandler(" + aContentType + "," + aURIString + "," + aTitle + ")"); + + // Check against the type blacklist. + // XXX this should be a "security exception" according to spec, but that + // isn't defined yet. + var contentType = this._resolveContentType(aContentType); + for (let blacklistType of TYPE_BLACKLIST) { + if (contentType == blacklistType) { + console.error("Unable to register content handler for prohibited MIME type %s.", contentType); + return; + } + } + + if (aContentWindow) { + var uri = this._checkAndGetURI(aURIString, aContentWindow); + + var browserWindow = this._getBrowserWindowForContentWindow(aContentWindow); + var browserElement = this._getBrowserForContentWindow(browserWindow, aContentWindow); + var notificationBox = browserWindow.gBrowser.getNotificationBox(browserElement); + this._appendFeedReaderNotification(uri, aTitle, notificationBox); + } + else + this._registerContentHandler(contentType, aURIString, aTitle); + }, + + /** + * Returns the browser chrome window in which the content window is in + */ + _getBrowserWindowForContentWindow: + function(aContentWindow) { + return aContentWindow.QueryInterface(Ci.nsIInterfaceRequestor) + .getInterface(Ci.nsIWebNavigation) + .QueryInterface(Ci.nsIDocShellTreeItem) + .rootTreeItem + .QueryInterface(Ci.nsIInterfaceRequestor) + .getInterface(Ci.nsIDOMWindow) + .wrappedJSObject; + }, + + /** + * Returns the <xul:browser> element associated with the given content + * window. + * + * @param aBrowserWindow + * The browser window in which the content window is in. + * @param aContentWindow + * The content window. It's possible to pass a child content window + * (i.e. the content window of a frame/iframe). + */ + _getBrowserForContentWindow: + function(aBrowserWindow, aContentWindow) { + // This depends on pseudo APIs of browser.js and tabbrowser.xml + aContentWindow = aContentWindow.top; + var browsers = aBrowserWindow.gBrowser.browsers; + for (var i = 0; i < browsers.length; ++i) { + if (browsers[i].contentWindow == aContentWindow) + return browsers[i]; + } + }, + + /** + * Appends a notifcation for the given feed reader details. + * + * The notification could be either a pseudo-dialog which lets + * the user to add the feed reader: + * [ [icon] Add %feed-reader-name% (%feed-reader-host%) as a Feed Reader? (Add) [x] ] + * + * or a simple message for the case where the feed reader is already registered: + * [ [icon] %feed-reader-name% is already registered as a Feed Reader [x] ] + * + * A new notification isn't appended if the given notificationbox has a + * notification for the same feed reader. + * + * @param aURI + * The url of the feed reader as a nsIURI object + * @param aName + * The feed reader name as it was passed to registerContentHandler + * @param aNotificationBox + * The notification box to which a notification might be appended + * @return true if a notification has been appended, false otherwise. + */ + _appendFeedReaderNotification: + function(aURI, aName, aNotificationBox) { + var uriSpec = aURI.spec; + var notificationValue = "feed reader notification: " + uriSpec; + var notificationIcon = aURI.prePath + "/favicon.ico"; + + // Don't append a new notification if the notificationbox + // has a notification for the given feed reader already + if (aNotificationBox.getNotificationWithValue(notificationValue)) + return false; + + var buttons, message; + if (this.getWebContentHandlerByURI(TYPE_MAYBE_FEED, uriSpec)) + message = this._getFormattedString("handlerRegistered", [aName]); + else { + message = this._getFormattedString("addHandler", [aName, aURI.host]); + var self = this; + var addButton = { + _outer: self, + label: self._getString("addHandlerAddButton"), + accessKey: self._getString("addHandlerAddButtonAccesskey"), + feedReaderInfo: { uri: uriSpec, name: aName }, + + /* static */ + callback: + function(aNotification, aButtonInfo) { + var uri = aButtonInfo.feedReaderInfo.uri; + var name = aButtonInfo.feedReaderInfo.name; + var outer = aButtonInfo._outer; + + // The reader could have been added from another window mean while + if (!outer.getWebContentHandlerByURI(TYPE_MAYBE_FEED, uri)) + outer._registerContentHandler(TYPE_MAYBE_FEED, uri, name); + + // avoid reference cycles + aButtonInfo._outer = null; + + return false; + } + }; + buttons = [addButton]; + } + + aNotificationBox.appendNotification(message, + notificationValue, + notificationIcon, + aNotificationBox.PRIORITY_INFO_LOW, + buttons); + return true; + }, + + /** + * Save Web Content Handler metadata to persistent preferences. + * @param contentType + * The content Type being handled + * @param uri + * The uri of the web service + * @param title + * The human readable name of the web service + * + * This data is stored under: + * + * browser.contentHandlers.type0 = content/type + * browser.contentHandlers.uri0 = http://www.foo.com/q=%s + * browser.contentHandlers.title0 = Foo 2.0alphr + */ + _saveContentHandlerToPrefs: + function(contentType, uri, title) { + var ps = + Cc["@mozilla.org/preferences-service;1"]. + getService(Ci.nsIPrefService); + var i = 0; + var typeBranch = null; + while (true) { + typeBranch = + ps.getBranch(PREF_CONTENTHANDLERS_BRANCH + i + "."); + try { + typeBranch.getCharPref("type"); + ++i; + } + catch (e) { + // No more handlers + break; + } + } + if (typeBranch) { + typeBranch.setCharPref("type", contentType); + var pls = + Cc["@mozilla.org/pref-localizedstring;1"]. + createInstance(Ci.nsIPrefLocalizedString); + pls.data = uri; + typeBranch.setComplexValue("uri", Ci.nsIPrefLocalizedString, pls); + pls.data = title; + typeBranch.setComplexValue("title", Ci.nsIPrefLocalizedString, pls); + + ps.savePrefFile(null); + } + }, + + /** + * Determines if there is a type with a particular uri registered for the + * specified content type already. + * @param contentType + * The content type that the uri handles + * @param uri + * The uri of the + */ + _typeIsRegistered: function(contentType, uri) { + if (!(contentType in this._contentTypes)) + return false; + + var services = this._contentTypes[contentType]; + for (var i = 0; i < services.length; ++i) { + // This uri has already been registered + if (services[i].uri == uri) + return true; + } + return false; + }, + + /** + * Gets a stream converter contract id for the specified content type. + * @param contentType + * The source content type for the conversion. + * @returns A contract id to construct a converter to convert between the + * contentType and *\/*. + */ + _getConverterContractID: function(contentType) { + const template = "@mozilla.org/streamconv;1?from=%s&to=*/*"; + return template.replace(/%s/, contentType); + }, + + /** + * Register a web service handler for a content type. + * + * @param contentType + * the content type being handled + * @param uri + * the URI of the web service + * @param title + * the human readable name of the web service + */ + _registerContentHandler: + function(contentType, uri, title) { + this._updateContentTypeHandlerMap(contentType, uri, title); + this._saveContentHandlerToPrefs(contentType, uri, title); + + if (contentType == TYPE_MAYBE_FEED) { + // Make the new handler the last-selected reader in the preview page + // and make sure the preview page is shown the next time a feed is visited + var pb = Cc["@mozilla.org/preferences-service;1"]. + getService(Ci.nsIPrefService).getBranch(null); + pb.setCharPref(PREF_SELECTED_READER, "web"); + + var supportsString = + Cc["@mozilla.org/supports-string;1"]. + createInstance(Ci.nsISupportsString); + supportsString.data = uri; + pb.setComplexValue(PREF_SELECTED_WEB, Ci.nsISupportsString, + supportsString); + pb.setCharPref(PREF_SELECTED_ACTION, "ask"); + this._setAutoHandler(TYPE_MAYBE_FEED, null); + } + }, + + /** + * Update the content type -> handler map. This mapping is not persisted, use + * registerContentHandler or _saveContentHandlerToPrefs for that purpose. + * @param contentType + * The content Type being handled + * @param uri + * The uri of the web service + * @param title + * The human readable name of the web service + */ + _updateContentTypeHandlerMap: + function(contentType, uri, title) { + if (!(contentType in this._contentTypes)) + this._contentTypes[contentType] = []; + + // Avoid adding duplicates + if (this._typeIsRegistered(contentType, uri)) + return; + + this._contentTypes[contentType].push(new ServiceInfo(contentType, uri, title)); + + if (!(contentType in this._blockedTypes)) { + var converterContractID = this._getConverterContractID(contentType); + var cr = Components.manager.QueryInterface(Ci.nsIComponentRegistrar); + cr.registerFactory(WCC_CLASSID, WCC_CLASSNAME, converterContractID, + WebContentConverterFactory); + } + }, + + /** + * See nsIWebContentConverterService + */ + getContentHandlers: + function(contentType, countRef) { + countRef.value = 0; + if (!(contentType in this._contentTypes)) + return []; + + var handlers = this._contentTypes[contentType]; + countRef.value = handlers.length; + return handlers; + }, + + /** + * See nsIWebContentConverterService + */ + resetHandlersForType: + function(contentType) { + // currently unused within the tree, so only useful for extensions; previous + // impl. was buggy (and even infinite-looped!), so I argue that this is a + // definite improvement + throw Cr.NS_ERROR_NOT_IMPLEMENTED; + }, + + /** + * Registers a handler from the settings on a preferences branch. + * + * @param branch + * an nsIPrefBranch containing "type", "uri", and "title" preferences + * corresponding to the content handler to be registered + */ + _registerContentHandlerWithBranch: function(branch) { + /** + * Since we support up to six predefined readers, we need to handle gaps + * better, since the first branch with user-added values will be .6 + * + * How we deal with that is to check to see if there's no prefs in the + * branch and stop cycling once that's true. This doesn't fix the case + * where a user manually removes a reader, but that's not supported yet! + */ + var vals = branch.getChildList(""); + if (vals.length == 0) + return; + + try { + var type = branch.getCharPref("type"); + var uri = branch.getComplexValue("uri", Ci.nsIPrefLocalizedString).data; + var title = branch.getComplexValue("title", + Ci.nsIPrefLocalizedString).data; + this._updateContentTypeHandlerMap(type, uri, title); + } + catch(ex) { + // do nothing, the next branch might have values + } + }, + + /** + * Load the auto handler, content handler and protocol tables from + * preferences. + */ + _init: function() { + var ps = + Cc["@mozilla.org/preferences-service;1"]. + getService(Ci.nsIPrefService); + + var kids = ps.getBranch(PREF_CONTENTHANDLERS_BRANCH) + .getChildList(""); + + // first get the numbers of the providers by getting all ###.uri prefs + var nums = []; + for (var i = 0; i < kids.length; i++) { + var match = /^(\d+)\.uri$/.exec(kids[i]); + if (!match) + continue; + else + nums.push(match[1]); + } + + // sort them, to get them back in order + nums.sort(function(a, b) {return a - b;}); + + // now register them + for (var i = 0; i < nums.length; i++) { + var branch = ps.getBranch(PREF_CONTENTHANDLERS_BRANCH + nums[i] + "."); + this._registerContentHandlerWithBranch(branch); + } + + // We need to do this _after_ registering all of the available handlers, + // so that getWebContentHandlerByURI can return successfully. + try { + var autoBranch = ps.getBranch(PREF_CONTENTHANDLERS_AUTO); + var childPrefs = autoBranch.getChildList(""); + for (var i = 0; i < childPrefs.length; ++i) { + var type = childPrefs[i]; + var uri = autoBranch.getCharPref(type); + if (uri) { + var handler = this.getWebContentHandlerByURI(type, uri); + this._setAutoHandler(type, handler); + } + } + } + catch (e) { + // No auto branch yet, that's fine + //LOG("WCCR.init: There is no auto branch, benign"); + } + }, + + /** + * See nsIObserver + */ + observe: function(subject, topic, data) { + var os = + Cc["@mozilla.org/observer-service;1"]. + getService(Ci.nsIObserverService); + switch (topic) { + case "app-startup": + os.addObserver(this, "browser-ui-startup-complete", false); + break; + case "browser-ui-startup-complete": + os.removeObserver(this, "browser-ui-startup-complete"); + this._init(); + break; + } + }, + + /** + * See nsIFactory + */ + createInstance: function(outer, iid) { + if (outer != null) + throw Cr.NS_ERROR_NO_AGGREGATION; + return this.QueryInterface(iid); + }, + + classID: WCCR_CLASSID, + + /** + * See nsISupports + */ + QueryInterface: XPCOMUtils.generateQI( + [Ci.nsIWebContentConverterService, + Ci.nsIWebContentHandlerRegistrar, + Ci.nsIObserver, + Ci.nsIFactory]), + + _xpcom_categories: [{ + category: "app-startup", + service: true + }] +}; + +this.NSGetFactory = XPCOMUtils.generateNSGetFactory([WebContentConverterRegistrar]); |