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Diffstat (limited to 'comm/suite/components/feeds/FeedConverter.js')
| -rw-r--r-- | comm/suite/components/feeds/FeedConverter.js | 461 |
1 files changed, 461 insertions, 0 deletions
diff --git a/comm/suite/components/feeds/FeedConverter.js b/comm/suite/components/feeds/FeedConverter.js new file mode 100644 index 0000000000..153f2a803d --- /dev/null +++ b/comm/suite/components/feeds/FeedConverter.js @@ -0,0 +1,461 @@ +/* -*- Mode: Javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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/. */ + +var {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm"); +var {XPCOMUtils} = ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm"); + +const TYPE_MAYBE_FEED = "application/vnd.mozilla.maybe.feed"; +const TYPE_MAYBE_VIDEO_FEED = "application/vnd.mozilla.maybe.video.feed"; +const TYPE_MAYBE_AUDIO_FEED = "application/vnd.mozilla.maybe.audio.feed"; +const TYPE_ANY = "*/*"; + +const FEEDHANDLER_URI = "about:feeds"; + +const PREF_SELECTED_APP = "browser.feeds.handlers.application"; +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_VIDEO_SELECTED_APP = "browser.videoFeeds.handlers.application"; +const PREF_VIDEO_SELECTED_WEB = "browser.videoFeeds.handlers.webservice"; +const PREF_VIDEO_SELECTED_ACTION = "browser.videoFeeds.handler"; +const PREF_VIDEO_SELECTED_READER = "browser.videoFeeds.handler.default"; + +const PREF_AUDIO_SELECTED_APP = "browser.audioFeeds.handlers.application"; +const PREF_AUDIO_SELECTED_WEB = "browser.audioFeeds.handlers.webservice"; +const PREF_AUDIO_SELECTED_ACTION = "browser.audioFeeds.handler"; +const PREF_AUDIO_SELECTED_READER = "browser.audioFeeds.handler.default"; + +function getPrefAppForType(t) { + switch (t) { + case Ci.nsIFeed.TYPE_VIDEO: + return PREF_VIDEO_SELECTED_APP; + + case Ci.nsIFeed.TYPE_AUDIO: + return PREF_AUDIO_SELECTED_APP; + + default: + return PREF_SELECTED_APP; + } +} + +function getPrefWebForType(t) { + switch (t) { + case Ci.nsIFeed.TYPE_VIDEO: + return PREF_VIDEO_SELECTED_WEB; + + case Ci.nsIFeed.TYPE_AUDIO: + return PREF_AUDIO_SELECTED_WEB; + + default: + return PREF_SELECTED_WEB; + } +} + +function getPrefActionForType(t) { + switch (t) { + case Ci.nsIFeed.TYPE_VIDEO: + return PREF_VIDEO_SELECTED_ACTION; + + case Ci.nsIFeed.TYPE_AUDIO: + return PREF_AUDIO_SELECTED_ACTION; + + default: + return PREF_SELECTED_ACTION; + } +} + +function getPrefReaderForType(t) { + switch (t) { + case Ci.nsIFeed.TYPE_VIDEO: + return PREF_VIDEO_SELECTED_READER; + + case Ci.nsIFeed.TYPE_AUDIO: + return PREF_AUDIO_SELECTED_READER; + + default: + return PREF_SELECTED_READER; + } +} + +function LOG(str) { + if (Services.prefs.getBoolPref("feeds.log", false)) + dump("*** Feeds: " + str + "\n"); +} + +function FeedConverter() { +} + +FeedConverter.prototype = { + /** + * This is the downloaded text data for the feed. + */ + _data: null, + + /** + * This is the object listening to the conversion, which is ultimately the + * docshell for the load. + */ + _listener: null, + + /** + * Records if the feed was sniffed + */ + _sniffed: false, + + /** + * See nsISupports.idl + */ + QueryInterface: XPCOMUtils.generateQI( + [Ci.nsIFeedResultListener, + Ci.nsIStreamConverter, + Ci.nsIStreamListener, + Ci.nsIRequestObserver]), + classID: Components.ID("{88592f45-3866-4c8e-9d8a-ab58b290fcf7}"), + + /** + * See nsIStreamConverter.idl + */ + convert: function convert(sourceStream, sourceType, destinationType, + context) { + throw Cr.NS_ERROR_NOT_IMPLEMENTED; + }, + + /** + * See nsIStreamConverter.idl + */ + asyncConvertData: function asyncConvertData(sourceType, destinationType, + listener, context) { + this._listener = listener; + }, + + /** + * Whether or not the preview page is being forced. + */ + _forcePreviewPage: false, + + /** + * Release our references to various things once we're done using them. + */ + _releaseHandles: function _releaseHandles() { + this._listener = null; + this._request = null; + this._processor = null; + }, + + /** + * See nsIFeedResultListener.idl + */ + handleResult: function handleResult(result) { + // Feeds come in various content types, which our feed sniffer coerces to + // the maybe.feed type. However, feeds are used as a transport for + // different data types, e.g. news/blogs (traditional feed), video/audio + // (podcasts) and photos (photocasts, photostreams). Each of these is + // different in that there's a different class of application suitable for + // handling feeds of that type, but without a content-type differentiation + // it is difficult for us to disambiguate. + // + // The other problem is that if the user specifies an auto-action handler + // for one feed application, the fact that the content type is shared means + // that all other applications will auto-load with that handler too, + // regardless of the content-type. + // + // This means that content-type alone is not enough to determine whether + // or not a feed should be auto-handled. Therefore for feeds we need + // to always use this stream converter, even when an auto-action is + // specified, not the basic one provided by WebContentConverter. This + // converter needs to consume all of the data and parse it, and based on + // that determination make a judgement about type. + // + // Since there are no content types for this content, and I'm not going to + // invent any, the upshot is that while a user can set an auto-handler for + // generic feed content, the system will prevent them from setting an auto- + // handler for other stream types. In those cases, the user will always see + // the preview page and have to select a handler. We can guess and show + // a client handler, but will not be able to show web handlers for those + // types. + // + // If this is just a feed, not some kind of specialized application, then + // auto-handlers can be set and we should obey them. + try { + var feedService = Cc["@mozilla.org/browser/feeds/result-service;1"] + .getService(Ci.nsIFeedResultService); + if (!this._forcePreviewPage && result.doc) { + var feed = result.doc.QueryInterface(Ci.nsIFeed); + var handler = Services.prefs.getCharPref(getPrefActionForType(feed.type), "ask"); + + if (handler != "ask") { + if (handler == "reader") + handler = Services.prefs.getCharPref(getPrefReaderForType(feed.type), "messenger"); + switch (handler) { + case "web": + var wccr = Cc["@mozilla.org/embeddor.implemented/web-content-handler-registrar;1"] + .getService(Ci.nsIWebContentConverterService); + if ((feed.type == Ci.nsIFeed.TYPE_FEED && + wccr.getAutoHandler(TYPE_MAYBE_FEED)) || + (feed.type == Ci.nsIFeed.TYPE_VIDEO && + wccr.getAutoHandler(TYPE_MAYBE_VIDEO_FEED)) || + (feed.type == Ci.nsIFeed.TYPE_AUDIO && + wccr.getAutoHandler(TYPE_MAYBE_AUDIO_FEED))) { + wccr.loadPreferredHandler(this._request); + return; + } + break; + + default: + LOG("unexpected handler: " + handler); + // fall through -- let feed service handle error + case "bookmarks": + case "client": + case "messenger": + try { + var title = feed.title ? feed.title.plainText() : ""; + var desc = feed.subtitle ? feed.subtitle.plainText() : ""; + feedService.addToClientReader(result.uri.spec, title, desc, feed.type); + return; + } catch(ex) { + /* fallback to preview mode */ + } + } + } + } + + var chromeChannel; + var oldChannel = this._request.QueryInterface(Ci.nsIChannel); + var loadInfo = oldChannel.loadInfo; + + // If there was no automatic handler, or this was a podcast, + // photostream or some other kind of application, show the + // preview page if the parser returned a document. + if (result.doc) { + + // Store the result in the result service so that the display + // page can access it. + feedService.addFeedResult(result); + + // Now load the actual XUL document. + var chromeURI = Services.io.newURI(FEEDHANDLER_URI); + chromeChannel = Services.io.newChannelFromURIWithLoadInfo(chromeURI, loadInfo); + // carry the origin attributes from the channel that loaded the feed. + chromeChannel.owner = Services.scriptSecurityManager + .createCodebasePrincipal(chromeURI, + loadInfo.originAttributes); + chromeChannel.originalURI = result.uri; + } + else + chromeChannel = Services.io.newChannelFromURIWithLoadInfo(result.uri, loadInfo); + + chromeChannel.loadGroup = this._request.loadGroup; + chromeChannel.asyncOpen2(this._listener); + } + finally { + this._releaseHandles(); + } + }, + + /** + * See nsIStreamListener.idl + */ + onDataAvailable: function onDataAvailable(request, context, inputStream, + sourceOffset, count) { + if (this._processor) + this._processor.onDataAvailable(request, context, inputStream, + sourceOffset, count); + }, + + /** + * See nsIRequestObserver.idl + */ + onStartRequest: function onStartRequest(request, context) { + var channel = request.QueryInterface(Ci.nsIChannel); + + // Check for a header that tells us there was no sniffing + // The value doesn't matter. + try { + var httpChannel = channel.QueryInterface(Ci.nsIHttpChannel); + // Make sure to check requestSucceeded before the potentially-throwing + // getResponseHeader. + if (!httpChannel.requestSucceeded) { + // Just give up, but don't forget to cancel the channel first! + request.cancel(Cr.NS_BINDING_ABORTED); + return; + } + // Note: this throws if the header is not set. + httpChannel.getResponseHeader("X-Moz-Is-Feed"); + } + catch (ex) { + this._sniffed = true; + } + + this._request = request; + + // Save and reset the forced state bit early, in case there's some kind of + // error. + var feedService = Cc["@mozilla.org/browser/feeds/result-service;1"] + .getService(Ci.nsIFeedResultService); + this._forcePreviewPage = feedService.forcePreviewPage; + feedService.forcePreviewPage = false; + + // Parse feed data as it comes in + this._processor = Cc["@mozilla.org/feed-processor;1"] + .createInstance(Ci.nsIFeedProcessor); + this._processor.listener = this; + this._processor.parseAsync(null, channel.URI); + + this._processor.onStartRequest(request, context); + }, + + /** + * See nsIRequestObserver.idl + */ + onStopRequest: function onStopRequest(request, context, status) { + if (this._processor) + this._processor.onStopRequest(request, context, status); + } + +}; + +/** + * Keeps parsed FeedResults around for use elsewhere in the UI after the stream + * converter completes. + */ +function FeedResultService() { +} + +FeedResultService.prototype = { + /** + * A URI spec -> [nsIFeedResult] hash. We have to keep a list as the + * value in case the same URI is requested concurrently. + */ + _results: { }, + + /** + * See nsIFeedResultService.idl + */ + forcePreviewPage: false, + + /** + * See nsIFeedResultService.idl + */ + addToClientReader: function addToClientReader(spec, title, subtitle, feedType) { + var handler = Services.prefs.getCharPref(getPrefActionForType(feedType), "reader"); + if (handler == "ask" || handler == "reader") + handler = Services.prefs.getCharPref(getPrefReaderForType(feedType), "messenger"); + + switch (handler) { + case "client": + var clientApp = Services.prefs.getComplexValue(getPrefAppForType(feedType), + Ci.nsIFile); + + // For the benefit of applications that might know how to deal with more + // URLs than just feeds, send feed: URLs in the following format: + // + // http urls: replace scheme with feed, e.g. + // http://foo.com/index.rdf -> feed://foo.com/index.rdf + // other urls: prepend feed: scheme, e.g. + // https://foo.com/index.rdf -> feed:https://foo.com/index.rdf + var feedURI = Services.io.newURI(spec); + if (feedURI.schemeIs("http")) { + feedURI.scheme = "feed"; + spec = feedURI.spec; + } + else + spec = "feed:" + spec; + + // Retrieving the shell service might fail on some systems, most + // notably systems where GNOME is not installed. + try { + var ss = Cc["@mozilla.org/suite/shell-service;1"] + .getService(Ci.nsIShellService); + ss.openApplicationWithURI(clientApp, spec); + } catch(e) { + // If we couldn't use the shell service, fallback to using a + // nsIProcess instance + var p = Cc["@mozilla.org/process/util;1"] + .createInstance(Ci.nsIProcess); + p.init(clientApp); + p.run(false, [spec], 1); + } + break; + + default: + // "web" should have been handled elsewhere + LOG("unexpected handler: " + handler); + // fall through + case "bookmarks": + var topWindow = Services.wm.getMostRecentWindow("navigator:browser"); + topWindow.PlacesCommandHook.addLiveBookmark(spec, title, subtitle) + .catch(Cu.reportError); + break; + case "messenger": + Cc["@mozilla.org/newsblog-feed-downloader;1"] + .getService(Ci.nsINewsBlogFeedDownloader) + .subscribeToFeed("feed:" + spec, null, null); + break; + + } + }, + + /** + * See nsIFeedResultService.idl + */ + addFeedResult: function addFeedResult(feedResult) { + if (feedResult == null) + throw new Error("null feedResult!"); + if (feedResult.uri == null) + throw new Error("null URI!"); + var spec = feedResult.uri.spec; + if (!this._results[spec]) + this._results[spec] = []; + this._results[spec].push(feedResult); + }, + + /** + * See nsIFeedResultService.idl + */ + getFeedResult: function getFeedResult(uri) { + if (uri == null) + throw new Error("null URI!"); + var resultList = this._results[uri.spec]; + for (let i = 0; i < resultList.length; ++i) { + if (resultList[i].uri == uri) + return resultList[i]; + } + return null; + }, + + /** + * See nsIFeedResultService.idl + */ + removeFeedResult: function removeFeedResult(uri) { + if (uri == null) + throw new Error("null URI!"); + var resultList = this._results[uri.spec]; + if (!resultList) + return; + var deletions = 0; + for (let i = 0; i < resultList.length; ++i) { + if (resultList[i].uri == uri) { + delete resultList[i]; + ++deletions; + } + } + + // send the holes to the end + resultList.sort(); + // and trim the list + resultList.splice(resultList.length - deletions, deletions); + if (resultList.length == 0) + delete this._results[uri.spec]; + }, + + QueryInterface: XPCOMUtils.generateQI([Ci.nsIFeedResultService]), + classID: Components.ID("{e5b05e9d-f037-48e4-b9a4-b99476582927}") +}; + +var components = [FeedConverter, + FeedResultService]; + +var NSGetFactory = XPCOMUtils.generateNSGetFactory(components); |