1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/b2g/components/ContentHandler.js Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,145 @@
1.4 +/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
1.6 +
1.7 +"use strict";
1.8 +
1.9 +const Cc = Components.classes;
1.10 +const Ci = Components.interfaces;
1.11 +const Cr = Components.results;
1.12 +const Cu = Components.utils;
1.13 +
1.14 +Cu.import("resource://gre/modules/XPCOMUtils.jsm");
1.15 +Cu.import("resource://gre/modules/Services.jsm");
1.16 +
1.17 +XPCOMUtils.defineLazyGetter(this, "cpmm", function() {
1.18 + return Cc["@mozilla.org/childprocessmessagemanager;1"]
1.19 + .getService(Ci.nsIMessageSender);
1.20 +});
1.21 +
1.22 +function debug(aMsg) {
1.23 + //dump("--*-- ContentHandler: " + aMsg + "\n");
1.24 +}
1.25 +
1.26 +const NS_ERROR_WONT_HANDLE_CONTENT = 0x805d0001;
1.27 +
1.28 +let ActivityContentFactory = {
1.29 + createInstance: function createInstance(outer, iid) {
1.30 + if (outer != null) {
1.31 + throw Cr.NS_ERROR_NO_AGGREGATION;
1.32 + }
1.33 + return new ActivityContentHandler().QueryInterface(iid);
1.34 + },
1.35 +
1.36 + QueryInterface: XPCOMUtils.generateQI([Ci.nsIFactory])
1.37 +}
1.38 +
1.39 +function ActivityContentHandler() {
1.40 +}
1.41 +
1.42 +ActivityContentHandler.prototype = {
1.43 + handleContent: function handleContent(aMimetype, aContext, aRequest) {
1.44 + if (!(aRequest instanceof Ci.nsIChannel))
1.45 + throw NS_ERROR_WONT_HANDLE_CONTENT;
1.46 +
1.47 + let detail = {
1.48 + "type": aMimetype,
1.49 + "url": aRequest.URI.spec
1.50 + };
1.51 + cpmm.sendAsyncMessage("content-handler", detail);
1.52 +
1.53 + aRequest.cancel(Cr.NS_BINDING_ABORTED);
1.54 + },
1.55 +
1.56 + QueryInterface: XPCOMUtils.generateQI([Ci.nsIContentHandler])
1.57 +}
1.58 +
1.59 +function ContentHandler() {
1.60 + this.classIdMap = {};
1.61 +}
1.62 +
1.63 +ContentHandler.prototype = {
1.64 + observe: function(aSubject, aTopic, aData) {
1.65 + if (aTopic == "app-startup") {
1.66 + // We only want to register these from content processes.
1.67 + let appInfo = Cc["@mozilla.org/xre/app-info;1"];
1.68 + if (appInfo.getService(Ci.nsIXULRuntime)
1.69 + .processType == Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT) {
1.70 + return;
1.71 + }
1.72 + }
1.73 +
1.74 + cpmm.addMessageListener("Activities:RegisterContentTypes", this);
1.75 + cpmm.addMessageListener("Activities:UnregisterContentTypes", this);
1.76 + cpmm.sendAsyncMessage("Activities:GetContentTypes", { });
1.77 + },
1.78 +
1.79 + /**
1.80 + * Do the component registration for a content type.
1.81 + * We only need to register one component per content type, even if several
1.82 + * apps provide it, so we keep track of the number of providers for each
1.83 + * content type.
1.84 + */
1.85 + registerContentHandler: function registerContentHandler(aContentType) {
1.86 + debug("Registering " + aContentType);
1.87 +
1.88 + // We already have a provider for this content type, just increase the
1.89 + // tracking count.
1.90 + if (this.classIdMap[aContentType]) {
1.91 + this.classIdMap[aContentType].count++;
1.92 + return;
1.93 + }
1.94 +
1.95 + let contractID = "@mozilla.org/uriloader/content-handler;1?type=" +
1.96 + aContentType;
1.97 + let uuidGen = Cc["@mozilla.org/uuid-generator;1"]
1.98 + .getService(Ci.nsIUUIDGenerator);
1.99 + let id = Components.ID(uuidGen.generateUUID().toString());
1.100 + this.classIdMap[aContentType] = { count: 1, id: id };
1.101 + let cr = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
1.102 + cr.registerFactory(Components.ID(id), "Activity Content Handler", contractID,
1.103 + ActivityContentFactory);
1.104 + },
1.105 +
1.106 + /**
1.107 + * Do the component unregistration for a content type.
1.108 + */
1.109 + unregisterContentHandler: function registerContentHandler(aContentType) {
1.110 + debug("Unregistering " + aContentType);
1.111 +
1.112 + let record = this.classIdMap[aContentType];
1.113 + if (!record) {
1.114 + return;
1.115 + }
1.116 +
1.117 + // Bail out if we still have providers left for this content type.
1.118 + if (--record.count > 0) {
1.119 + return;
1.120 + }
1.121 +
1.122 + let contractID = "@mozilla.org/uriloader/content-handler;1?type=" +
1.123 + aContentType;
1.124 + let cr = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
1.125 + cr.unregisterFactory(record.id, ActivityContentFactory);
1.126 + delete this.classIdMap[aContentType]
1.127 + },
1.128 +
1.129 + receiveMessage: function(aMessage) {
1.130 + let data = aMessage.data;
1.131 +
1.132 + switch (aMessage.name) {
1.133 + case "Activities:RegisterContentTypes":
1.134 + data.contentTypes.forEach(this.registerContentHandler, this);
1.135 + break;
1.136 + case "Activities:UnregisterContentTypes":
1.137 + data.contentTypes.forEach(this.unregisterContentHandler, this);
1.138 + break;
1.139 + }
1.140 + },
1.141 +
1.142 + classID: Components.ID("{d18d0216-d50c-11e1-ba54-efb18d0ef0ac}"),
1.143 + QueryInterface: XPCOMUtils.generateQI([Ci.nsIContentHandler,
1.144 + Ci.nsIObserver,
1.145 + Ci.nsISupportsWeakReference])
1.146 +};
1.147 +
1.148 +this.NSGetFactory = XPCOMUtils.generateNSGetFactory([ContentHandler]);
