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gaia/dev_apps/music-oga/js/open.js

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+/* global AudioMetadata, getStorageIfAvailable, getUnusedFilename, MimeMapper,
+          PlaybackQueue, PlayerView, TYPE_SINGLE */
+'use strict';
+
+navigator.mozL10n.once(function onLocalizationInit() {
+  navigator.mozSetMessageHandler('activity', handleOpenActivity);
+});
+
+function handleOpenActivity(request) {
+  var data = request.source.data;
+  var blob = request.source.data.blob;
+  var header = document.getElementById('header');
+  var saveButton = document.getElementById('title-save');
+  var banner = document.getElementById('banner');
+  var message = document.getElementById('message');
+  var storage;       // A device storage object used by the save button
+  var saved = false; // Did we save it?
+
+  // If the app that initiated this activity wants us to allow the
+  // user to save this blob as a file, and if device storage is available
+  // and if there is enough free space, and if provided file extention
+  // is appropriate for the file type, then display a save button.
+  if (data.allowSave && data.filename && checkFilename()) {
+    saveButton.hidden = false;
+    saveButton.disabled = true;
+    header.runFontFit();
+
+    getStorageIfAvailable('music', blob.size, function(ds) {
+      storage = ds;
+      saveButton.disabled = false;
+    });
+  }
+
+  playBlob(blob);
+
+  function playBlob(blob) {
+    PlayerView.init(TYPE_SINGLE);
+    PlayerView.stop();
+
+    PlaybackQueue.loadSettings().then(() => {
+      return AudioMetadata.parse(blob);
+    }).then((metadata) => {
+      var fileinfo = {metadata: metadata,
+                      name: blob.name,
+                      blob: blob};
+
+      PlayerView.activate(new PlaybackQueue.StaticQueue([fileinfo]));
+      PlayerView.start();
+    }).catch((e) => {
+      console.error(e);
+      alert(navigator.mozL10n.get('audioinvalid'));
+      done();
+    });
+  }
+
+  // Set up events for close/save in the single player
+  header.addEventListener('action', done);
+  saveButton.addEventListener('click', save);
+
+  // Terminate music playback when visibility is changed.
+  window.addEventListener('visibilitychange',
+    function onVisibilityChanged() {
+      if (document.hidden) {
+        done();
+      }
+    });
+
+  function done() {
+    PlayerView.stop();
+    request.postResult({saved: saved});
+  }
+
+  function save() {
+    // Hide the menu that holds the save button: we can only save once
+    saveButton.hidden = true;
+
+    // XXX work around bug 870619
+    document.getElementById('title-text').textContent =
+      document.getElementById('title-text').textContent;
+
+    getUnusedFilename(storage, data.filename, function(filename) {
+      var savereq = storage.addNamed(blob, filename);
+      savereq.onsuccess = function() {
+        // Remember that it has been saved so we can pass this back
+        // to the invoking app
+        saved = filename;
+        // And tell the user
+        showBanner(navigator.mozL10n.get('saved', {
+          title: document.getElementById('title-text').textContent
+        }));
+      };
+      savereq.onerror = function(e) {
+        // XXX we don't report this to the user because it is hard to
+        // localize.
+        console.error('Error saving', filename, e);
+      };
+    });
+  }
+
+  function checkFilename() {
+    var dotIdx = data.filename.lastIndexOf('.'), ext;
+
+    if (dotIdx > -1) {
+      ext = data.filename.substr(dotIdx + 1);
+
+      // workaround for bug909373 and bug852864, since for audio/ogg files we
+      // get video/ogg for blob.type, we let any file with ogg extention pass
+      if (ext === 'ogg') {
+        return true;
+      } else {
+        return MimeMapper.guessTypeFromExtension(ext) === blob.type;
+      }
+    } else {
+      return false;
+    }
+  }
+
+  function showBanner(msg) {
+    message.textContent = msg;
+    banner.hidden = false;
+    setTimeout(function() {
+      banner.hidden = true;
+    }, 3000);
+  }
+}