chrome/renderer/resources/extensions/downloads_custom_bindings.js

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Custom bindings for the downloads API.
   6
   7 var binding = require('binding').Binding.create('downloads');
   8 var downloadsInternal = require('binding').Binding.create(
   9     'downloadsInternal').generate();
  10 var eventBindings = require('event_bindings');
  11
  12 eventBindings.registerArgumentMassager(
  13     'downloads.onDeterminingFilename',
  14     function massage_determining_filename(args, dispatch) {
  15   var downloadItem = args[0];
  16   // Copy the id so that extensions can't change it.
  17   var downloadId = downloadItem.id;
  18   var suggestable = true;
  19   function isValidResult(result) {
  20     if (result === undefined)
  21       return false;
  22     if (typeof(result) != 'object') {
  23       console.error('Error: Invocation of form suggest(' + typeof(result) +
  24                     ') doesn\'t match definition suggest({filename: string, ' +
  25                     'conflictAction: string})');
  26       return false;
  27     } else if ((typeof(result.filename) != 'string') ||
  28                (result.filename.length == 0)) {
  29       console.error('Error: "filename" parameter to suggest() must be a ' +
  30                     'non-empty string');
  31       return false;
  32     } else if ([undefined, 'uniquify', 'overwrite', 'prompt'].indexOf(
  33                  result.conflictAction) < 0) {
  34       console.error('Error: "conflictAction" parameter to suggest() must be ' +
  35                     'one of undefined, "uniquify", "overwrite", "prompt"');
  36       return false;
  37     }
  38     return true;
  39   }
  40   function suggestCallback(result) {
  41     if (!suggestable) {
  42       console.error('suggestCallback may not be called more than once.');
  43       return;
  44     }
  45     suggestable = false;
  46     if (isValidResult(result)) {
  47       downloadsInternal.determineFilename(
  48           downloadId, result.filename, result.conflictAction || "");
  49     } else {
  50       downloadsInternal.determineFilename(downloadId, "", "");
  51     }
  52   }
  53   try {
  54     var results = dispatch([downloadItem, suggestCallback]);
  55     var async = (results &&
  56                  results.results &&
  57                  (results.results.length != 0) &&
  58                  (results.results[0] === true));
  59     if (suggestable && !async)
  60       suggestCallback();
  61   } catch (e) {
  62     suggestCallback();
  63     throw e;
  64   }
  65 });
  66 exports.binding = binding.generate();