pt 1 in reviving the android build (copied from pm 28a1, wish me luck)

mobile/android/modules/HelperApps.jsm

@@ -0,0 +1,229 @@
+/* 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/. */
+"use strict";
+
+/* globals ContentAreaUtils */
+
+const { classes: Cc, interfaces: Ci, utils: Cu, results: Cr } = Components;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Prompt",
+                                  "resource://gre/modules/Prompt.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Messaging",
+                                  "resource://gre/modules/Messaging.jsm");
+
+XPCOMUtils.defineLazyGetter(this, "ContentAreaUtils", function() {
+  let ContentAreaUtils = {};
+  Services.scriptloader.loadSubScript("chrome://global/content/contentAreaUtils.js", ContentAreaUtils);
+  return ContentAreaUtils;
+});
+
+this.EXPORTED_SYMBOLS = ["App","HelperApps"];
+
+function App(data) {
+  this.name = data.name;
+  this.isDefault = data.isDefault;
+  this.packageName = data.packageName;
+  this.activityName = data.activityName;
+  this.iconUri = "-moz-icon://" + data.packageName;
+}
+
+App.prototype = {
+  // callback will be null if a result is not requested
+  launch: function(uri, callback) {
+    HelperApps._launchApp(this, uri, callback);
+    return false;
+  }
+}
+
+var HelperApps =  {
+  get defaultBrowsers() {
+    delete this.defaultBrowsers;
+    this.defaultBrowsers = this._getHandlers("http://www.example.com", {
+      filterBrowsers: false,
+      filterHtml: false
+    });
+    return this.defaultBrowsers;
+  },
+
+  // Finds handlers that have registered for text/html pages or urls ending in html. Some apps, like
+  // the Samsung Video player will only appear for these urls, while some Browsers (like Link Bubble)
+  // won't register here because of the text/html mime type.
+  get defaultHtmlHandlers() {
+    delete this.defaultHtmlHandlers;
+    return this.defaultHtmlHandlers = this._getHandlers("http://www.example.com/index.html", {
+      filterBrowsers: false,
+      filterHtml: false
+    });
+  },
+
+  _getHandlers: function(url, options) {
+    let values = {};
+
+    let handlers = this.getAppsForUri(Services.io.newURI(url, null, null), options);
+    handlers.forEach(function(app) {
+      values[app.name] = app;
+    }, this);
+
+    return values;
+  },
+
+  get protoSvc() {
+    delete this.protoSvc;
+    return this.protoSvc = Cc["@mozilla.org/uriloader/external-protocol-service;1"].getService(Ci.nsIExternalProtocolService);
+  },
+
+  get urlHandlerService() {
+    delete this.urlHandlerService;
+    return this.urlHandlerService = Cc["@mozilla.org/uriloader/external-url-handler-service;1"].getService(Ci.nsIExternalURLHandlerService);
+  },
+
+  prompt: function showPicker(apps, promptOptions, callback) {
+    let p = new Prompt(promptOptions).addIconGrid({ items: apps });
+    p.show(callback);
+  },
+
+  getAppsForProtocol: function getAppsForProtocol(scheme) {
+    let protoHandlers = this.protoSvc.getProtocolHandlerInfoFromOS(scheme, {}).possibleApplicationHandlers;
+
+    let results = {};
+    for (let i = 0; i < protoHandlers.length; i++) {
+      try {
+        let protoApp = protoHandlers.queryElementAt(i, Ci.nsIHandlerApp);
+        results[protoApp.name] = new App({
+          name: protoApp.name,
+          description: protoApp.detailedDescription,
+        });
+      } catch(e) {}
+    }
+
+    return results;
+  },
+
+  getAppsForUri: function getAppsForUri(uri, flags = { }, callback) {
+    // Return early for well-known internal schemes
+    if (!uri || uri.schemeIs("about") || uri.schemeIs("chrome")) {
+      if (callback) {
+        callback([]);
+      }
+      return [];
+    }
+
+    flags.filterBrowsers = "filterBrowsers" in flags ? flags.filterBrowsers : true;
+    flags.filterHtml = "filterHtml" in flags ? flags.filterHtml : true;
+
+    // Query for apps that can/can't handle the mimetype
+    let msg = this._getMessage("Intent:GetHandlers", uri, flags);
+    let parseData = (d) => {
+      let apps = []
+      if (!d) {
+        return apps;
+      }
+
+      apps = this._parseApps(d.apps);
+
+      if (flags.filterBrowsers) {
+        apps = apps.filter((app) => {
+          return app.name && !this.defaultBrowsers[app.name];
+        });
+      }
+
+      // Some apps will register for html files (the Samsung Video player) but should be shown
+      // for non-HTML files (like videos). This filters them only if the page has an htm of html
+      // file extension.
+      if (flags.filterHtml) {
+        // Matches from the first '.' to the end of the string, '?', or '#'
+        let ext = /\.([^\?#]*)/.exec(uri.path);
+        if (ext && (ext[1] === "html" || ext[1] === "htm")) {
+          apps = apps.filter(function(app) {
+            return app.name && !this.defaultHtmlHandlers[app.name];
+          }, this);
+        }
+      }
+
+      return apps;
+    };
+
+    if (!callback) {
+      let data = this._sendMessageSync(msg);
+      return parseData(data);
+    } else {
+      Messaging.sendRequestForResult(msg).then(function(data) {
+        callback(parseData(data));
+      });
+    }
+  },
+
+  launchUri: function launchUri(uri) {
+    let msg = this._getMessage("Intent:Open", uri);
+    Messaging.sendRequest(msg);
+  },
+
+  _parseApps: function _parseApps(appInfo) {
+    // appInfo -> {apps: [app1Label, app1Default, app1PackageName, app1ActivityName, app2Label, app2Defaut, ...]}
+    // see GeckoAppShell.java getHandlersForIntent function for details
+    const numAttr = 4; // 4 elements per ResolveInfo: label, default, package name, activity name.
+
+    let apps = [];
+    for (let i = 0; i < appInfo.length; i += numAttr) {
+      apps.push(new App({"name" : appInfo[i],
+                 "isDefault" : appInfo[i+1],
+                 "packageName" : appInfo[i+2],
+                 "activityName" : appInfo[i+3]}));
+    }
+
+    return apps;
+  },
+
+  _getMessage: function(type, uri, options = {}) {
+    let mimeType = options.mimeType;
+    if (uri && mimeType == undefined) {
+      mimeType = ContentAreaUtils.getMIMETypeForURI(uri) || "";
+    }
+
+    return {
+      type: type,
+      mime: mimeType,
+      action: options.action || "", // empty action string defaults to android.intent.action.VIEW
+      url: uri ? uri.spec : "",
+      packageName: options.packageName || "",
+      className: options.className || ""
+    };
+  },
+
+  _launchApp: function launchApp(app, uri, callback) {
+    if (callback) {
+        let msg = this._getMessage("Intent:OpenForResult", uri, {
+            packageName: app.packageName,
+            className: app.activityName
+        });
+
+        Messaging.sendRequestForResult(msg).then(callback);
+    } else {
+        let msg = this._getMessage("Intent:Open", uri, {
+            packageName: app.packageName,
+            className: app.activityName
+        });
+
+        Messaging.sendRequest(msg);
+    }
+  },
+
+  _sendMessageSync: function(msg) {
+    let res = null;
+    Messaging.sendRequestForResult(msg).then(function(data) {
+      res = data;
+    });
+
+    let thread = Services.tm.currentThread;
+    while (res == null) {
+      thread.processNextEvent(true);
+    }
+
+    return res;
+  },
+};