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

mobile/android/components/HelperAppDialog.js

@@ -0,0 +1,373 @@
+// -*- 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/. */
+
+/*globals ContentAreaUtils */
+
+const { classes: Cc, interfaces: Ci, utils: Cu, results: Cr } = Components;
+
+const APK_MIME_TYPE = "application/vnd.android.package-archive";
+
+const OMA_DOWNLOAD_DESCRIPTOR_MIME_TYPE = "application/vnd.oma.dd+xml";
+const OMA_DRM_MESSAGE_MIME = "application/vnd.oma.drm.message";
+const OMA_DRM_CONTENT_MIME = "application/vnd.oma.drm.content";
+const OMA_DRM_RIGHTS_MIME = "application/vnd.oma.drm.rights+wbxml";
+
+const PREF_BD_USEDOWNLOADDIR = "browser.download.useDownloadDir";
+const URI_GENERIC_ICON_DOWNLOAD = "drawable://alert_download";
+
+Cu.import("resource://gre/modules/Downloads.jsm");
+Cu.import("resource://gre/modules/FileUtils.jsm");
+Cu.import("resource://gre/modules/HelperApps.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
+Cu.import("resource://gre/modules/Task.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "RuntimePermissions", "resource://gre/modules/RuntimePermissions.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Messaging", "resource://gre/modules/Messaging.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Snackbars", "resource://gre/modules/Snackbars.jsm");
+
+// -----------------------------------------------------------------------
+// HelperApp Launcher Dialog
+// -----------------------------------------------------------------------
+
+XPCOMUtils.defineLazyGetter(this, "ContentAreaUtils", function() {
+  let ContentAreaUtils = {};
+  Services.scriptloader.loadSubScript("chrome://global/content/contentAreaUtils.js", ContentAreaUtils);
+  return ContentAreaUtils;
+});
+
+function HelperAppLauncherDialog() { }
+
+HelperAppLauncherDialog.prototype = {
+  classID: Components.ID("{e9d277a0-268a-4ec2-bb8c-10fdf3e44611}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIHelperAppLauncherDialog]),
+
+  /**
+   * Returns false if `url` represents a local or special URL that we don't
+   * wish to ever download.
+   *
+   * Returns true otherwise.
+   */
+  _canDownload: function (url, alreadyResolved=false) {
+    // The common case.
+    if (url.schemeIs("http") ||
+        url.schemeIs("https") ||
+        url.schemeIs("ftp")) {
+      return true;
+    }
+
+    // The less-common opposite case.
+    if (url.schemeIs("chrome") ||
+        url.schemeIs("jar") ||
+        url.schemeIs("resource") ||
+        url.schemeIs("wyciwyg") ||
+        url.schemeIs("file")) {
+      return false;
+    }
+
+    // For all other URIs, try to resolve them to an inner URI, and check that.
+    if (!alreadyResolved) {
+      let innerURI = NetUtil.newChannel({
+        uri: url,
+        loadUsingSystemPrincipal: true
+      }).URI;
+
+      if (!url.equals(innerURI)) {
+        return this._canDownload(innerURI, true);
+      }
+    }
+
+    // Anything else is fine to download.
+    return true;
+  },
+
+  /**
+   * Returns true if `launcher` represents a download for which we wish
+   * to prompt.
+   */
+  _shouldPrompt: function (launcher) {
+    let mimeType = this._getMimeTypeFromLauncher(launcher);
+
+    // Straight equality: nsIMIMEInfo normalizes.
+    return APK_MIME_TYPE == mimeType || OMA_DOWNLOAD_DESCRIPTOR_MIME_TYPE == mimeType;
+  },
+
+  /**
+   * Returns true if `launcher` represents a download for which we wish to
+   * offer a "Save to disk" option.
+   */
+  _shouldAddSaveToDiskIntent: function(launcher) {
+      let mimeType = this._getMimeTypeFromLauncher(launcher);
+
+      // We can't handle OMA downloads. So don't even try. (Bug 1219078)
+      return mimeType != OMA_DOWNLOAD_DESCRIPTOR_MIME_TYPE;
+  },
+
+  /**
+   * Returns true if `launcher`represents a download that should not be handled by Firefox
+   * or a third-party app and instead be forwarded to Android's download manager.
+   */
+  _shouldForwardToAndroidDownloadManager: function(aLauncher) {
+    let forwardDownload = Services.prefs.getBoolPref('browser.download.forward_oma_android_download_manager');
+    if (!forwardDownload) {
+      return false;
+    }
+
+    let mimeType = aLauncher.MIMEInfo.MIMEType;
+    if (!mimeType) {
+      mimeType = ContentAreaUtils.getMIMETypeForURI(aLauncher.source) || "";
+    }
+
+    return [
+      OMA_DOWNLOAD_DESCRIPTOR_MIME_TYPE,
+      OMA_DRM_MESSAGE_MIME,
+      OMA_DRM_CONTENT_MIME,
+      OMA_DRM_RIGHTS_MIME
+    ].indexOf(mimeType) != -1;
+  },
+
+  show: function hald_show(aLauncher, aContext, aReason) {
+    if (!this._canDownload(aLauncher.source)) {
+      this._refuseDownload(aLauncher);
+      return;
+    }
+
+    if (this._shouldForwardToAndroidDownloadManager(aLauncher)) {
+      Task.spawn(function* () {
+        try {
+          let hasPermission = yield RuntimePermissions.waitForPermissions(RuntimePermissions.WRITE_EXTERNAL_STORAGE);
+          if (hasPermission) {
+            this._downloadWithAndroidDownloadManager(aLauncher);
+            aLauncher.cancel(Cr.NS_BINDING_ABORTED);
+          }
+        } finally {
+        }
+      }.bind(this)).catch(Cu.reportError);
+      return;
+    }
+
+    let bundle = Services.strings.createBundle("chrome://browser/locale/browser.properties");
+
+    let defaultHandler = new Object();
+    let apps = HelperApps.getAppsForUri(aLauncher.source, {
+      mimeType: aLauncher.MIMEInfo.MIMEType,
+    });
+
+    if (this._shouldAddSaveToDiskIntent(aLauncher)) {
+      // Add a fake intent for save to disk at the top of the list.
+      apps.unshift({
+        name: bundle.GetStringFromName("helperapps.saveToDisk"),
+        packageName: "org.mozilla.gecko.Download",
+        iconUri: "drawable://icon",
+        selected: true, // Default to download for files
+        launch: function() {
+          // Reset the preferredAction here.
+          aLauncher.MIMEInfo.preferredAction = Ci.nsIMIMEInfo.saveToDisk;
+          aLauncher.saveToDisk(null, false);
+          return true;
+        }
+      });
+    }
+
+    // We do not handle this download and there are no apps that want to do it
+    if (apps.length === 0) {
+      this._refuseDownload(aLauncher);
+      return;
+    }
+
+    let callback = function(app) {
+      aLauncher.MIMEInfo.preferredAction = Ci.nsIMIMEInfo.useHelperApp;
+      if (!app.launch(aLauncher.source)) {
+        // Once the app is done we need to get rid of the temp file. This shouldn't
+        // get run in the saveToDisk case.
+        aLauncher.cancel(Cr.NS_BINDING_ABORTED);
+      }
+    }
+
+    // See if the user already marked something as the default for this mimetype,
+    // and if that app is still installed.
+    let preferredApp = this._getPreferredApp(aLauncher);
+    if (preferredApp) {
+      let pref = apps.filter(function(app) {
+        return app.packageName === preferredApp;
+      });
+
+      if (pref.length > 0) {
+        callback(pref[0]);
+        return;
+      }
+    }
+
+    // If there's only one choice, and we don't want to prompt, go right ahead
+    // and choose that app automatically.
+    if (!this._shouldPrompt(aLauncher) && (apps.length === 1)) {
+      callback(apps[0]);
+      return;
+    }
+
+    // Otherwise, let's go through the prompt.
+    HelperApps.prompt(apps, {
+      title: bundle.GetStringFromName("helperapps.pick"),
+      buttons: [
+        bundle.GetStringFromName("helperapps.alwaysUse"),
+        bundle.GetStringFromName("helperapps.useJustOnce")
+      ],
+      // Tapping an app twice should choose "Just once".
+      doubleTapButton: 1
+    }, (data) => {
+      if (data.button < 0) {
+        return;
+      }
+
+      callback(apps[data.icongrid0]);
+
+      if (data.button === 0) {
+        this._setPreferredApp(aLauncher, apps[data.icongrid0]);
+      }
+    });
+  },
+
+  _refuseDownload: function(aLauncher) {
+    aLauncher.cancel(Cr.NS_BINDING_ABORTED);
+
+    Services.console.logStringMessage("Refusing download of non-downloadable file.");
+
+    let bundle = Services.strings.createBundle("chrome://browser/locale/handling.properties");
+    let failedText = bundle.GetStringFromName("download.blocked");
+
+    Snackbars.show(failedText, Snackbars.LENGTH_LONG);
+  },
+
+  _downloadWithAndroidDownloadManager(aLauncher) {
+    let mimeType = aLauncher.MIMEInfo.MIMEType;
+    if (!mimeType) {
+      mimeType = ContentAreaUtils.getMIMETypeForURI(aLauncher.source) || "";
+    }
+
+    Messaging.sendRequest({
+      'type': 'Download:AndroidDownloadManager',
+      'uri': aLauncher.source.spec,
+      'mimeType': mimeType,
+      'filename': aLauncher.suggestedFileName
+    });
+  },
+
+  _getPrefName: function getPrefName(mimetype) {
+    return "browser.download.preferred." + mimetype.replace("\\", ".");
+  },
+
+  _getMimeTypeFromLauncher: function (launcher) {
+    let mime = launcher.MIMEInfo.MIMEType;
+    if (!mime)
+      mime = ContentAreaUtils.getMIMETypeForURI(launcher.source) || "";
+    return mime;
+  },
+
+  _getPreferredApp: function getPreferredApp(launcher) {
+    let mime = this._getMimeTypeFromLauncher(launcher);
+    if (!mime)
+      return;
+
+    try {
+      return Services.prefs.getCharPref(this._getPrefName(mime));
+    } catch(ex) {
+      Services.console.logStringMessage("Error getting pref for " + mime + ".");
+    }
+    return null;
+  },
+
+  _setPreferredApp: function setPreferredApp(launcher, app) {
+    let mime = this._getMimeTypeFromLauncher(launcher);
+    if (!mime)
+      return;
+
+    if (app)
+      Services.prefs.setCharPref(this._getPrefName(mime), app.packageName);
+    else
+      Services.prefs.clearUserPref(this._getPrefName(mime));
+  },
+
+  promptForSaveToFileAsync: function (aLauncher, aContext, aDefaultFile,
+                                      aSuggestedFileExt, aForcePrompt) {
+    Task.spawn(function* () {
+      let file = null;
+      try {
+        let hasPermission = yield RuntimePermissions.waitForPermissions(RuntimePermissions.WRITE_EXTERNAL_STORAGE);
+        if (hasPermission) {
+          // If we do have the STORAGE permission then pick the public downloads directory as destination
+          // for this file. Without the permission saveDestinationAvailable(null) will be called which
+          // will effectively cancel the download.
+          let preferredDir = yield Downloads.getPreferredDownloadsDirectory();
+          file = this.validateLeafName(new FileUtils.File(preferredDir),
+                                       aDefaultFile, aSuggestedFileExt);
+        }
+      } finally {
+        // The file argument will be null in case any exception occurred.
+        aLauncher.saveDestinationAvailable(file);
+      }
+    }.bind(this)).catch(Cu.reportError);
+  },
+
+  validateLeafName: function hald_validateLeafName(aLocalFile, aLeafName, aFileExt) {
+    if (!(aLocalFile && this.isUsableDirectory(aLocalFile)))
+      return null;
+
+    // Remove any leading periods, since we don't want to save hidden files
+    // automatically.
+    aLeafName = aLeafName.replace(/^\.+/, "");
+
+    if (aLeafName == "")
+      aLeafName = "unnamed" + (aFileExt ? "." + aFileExt : "");
+    aLocalFile.append(aLeafName);
+
+    this.makeFileUnique(aLocalFile);
+    return aLocalFile;
+  },
+
+  makeFileUnique: function hald_makeFileUnique(aLocalFile) {
+    try {
+      // Note - this code is identical to that in
+      //   toolkit/content/contentAreaUtils.js.
+      // If you are updating this code, update that code too! We can't share code
+      // here since this is called in a js component.
+      let collisionCount = 0;
+      while (aLocalFile.exists()) {
+        collisionCount++;
+        if (collisionCount == 1) {
+          // Append "(2)" before the last dot in (or at the end of) the filename
+          // special case .ext.gz etc files so we don't wind up with .tar(2).gz
+          if (aLocalFile.leafName.match(/\.[^\.]{1,3}\.(gz|bz2|Z)$/i))
+            aLocalFile.leafName = aLocalFile.leafName.replace(/\.[^\.]{1,3}\.(gz|bz2|Z)$/i, "(2)$&");
+          else
+            aLocalFile.leafName = aLocalFile.leafName.replace(/(\.[^\.]*)?$/, "(2)$&");
+        }
+        else {
+          // replace the last (n) in the filename with (n+1)
+          aLocalFile.leafName = aLocalFile.leafName.replace(/^(.*\()\d+\)/, "$1" + (collisionCount+1) + ")");
+        }
+      }
+      aLocalFile.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600);
+    }
+    catch (e) {
+      dump("*** exception in validateLeafName: " + e + "\n");
+
+      if (e.result == Cr.NS_ERROR_FILE_ACCESS_DENIED)
+        throw e;
+
+      if (aLocalFile.leafName == "" || aLocalFile.isDirectory()) {
+        aLocalFile.append("unnamed");
+        if (aLocalFile.exists())
+          aLocalFile.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600);
+      }
+    }
+  },
+
+  isUsableDirectory: function hald_isUsableDirectory(aDirectory) {
+    return aDirectory.exists() && aDirectory.isDirectory() && aDirectory.isWritable();
+  },
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([HelperAppLauncherDialog]);