pdf.js/web/firefoxcom.js

/* Copyright 2012 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { createObjectURL, PDFDataRangeTransport, shadow } from './pdfjs';
import { BasePreferences } from './preferences';
import { PDFViewerApplication } from './app';

if (typeof PDFJSDev === 'undefined' ||
    !PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
  throw new Error('Module "pdfjs-web/firefoxcom" shall not be used outside ' +
                  'FIREFOX and MOZCENTRAL builds.');
}

var FirefoxCom = (function FirefoxComClosure() {
  return {
    /**
     * Creates an event that the extension is listening for and will
     * synchronously respond to.
     * NOTE: It is reccomended to use request() instead since one day we may not
     * be able to synchronously reply.
     * @param {String} action The action to trigger.
     * @param {String} data Optional data to send.
     * @return {*} The response.
     */
    requestSync(action, data) {
      var request = document.createTextNode('');
      document.documentElement.appendChild(request);

      var sender = document.createEvent('CustomEvent');
      sender.initCustomEvent('pdf.js.message', true, false,
                             { action, data, sync: true, });
      request.dispatchEvent(sender);
      var response = sender.detail.response;
      document.documentElement.removeChild(request);
      return response;
    },
    /**
     * Creates an event that the extension is listening for and will
     * asynchronously respond by calling the callback.
     * @param {String} action The action to trigger.
     * @param {String} data Optional data to send.
     * @param {Function} callback Optional response callback that will be called
     * with one data argument.
     */
    request(action, data, callback) {
      var request = document.createTextNode('');
      if (callback) {
        document.addEventListener('pdf.js.response', function listener(event) {
          var node = event.target;
          var response = event.detail.response;

          document.documentElement.removeChild(node);

          document.removeEventListener('pdf.js.response', listener);
          return callback(response);
        });
      }
      document.documentElement.appendChild(request);

      var sender = document.createEvent('CustomEvent');
      sender.initCustomEvent('pdf.js.message', true, false, {
        action,
        data,
        sync: false,
        responseExpected: !!callback
      });
      return request.dispatchEvent(sender);
    }
  };
})();

var DownloadManager = (function DownloadManagerClosure() {
  function DownloadManager() {}

  DownloadManager.prototype = {
    downloadUrl: function DownloadManager_downloadUrl(url, filename) {
      FirefoxCom.request('download', {
        originalUrl: url,
        filename,
      });
    },

    downloadData: function DownloadManager_downloadData(data, filename,
                                                        contentType) {
      var blobUrl = createObjectURL(data, contentType, false);

      FirefoxCom.request('download', {
        blobUrl,
        originalUrl: blobUrl,
        filename,
        isAttachment: true
      });
    },

    download: function DownloadManager_download(blob, url, filename) {
      let blobUrl = window.URL.createObjectURL(blob);
      let onResponse = (err) => {
        if (err && this.onerror) {
          this.onerror(err);
        }
        window.URL.revokeObjectURL(blobUrl);
      };

      FirefoxCom.request('download', {
        blobUrl,
        originalUrl: url,
        filename,
      }, onResponse);
    }
  };

  return DownloadManager;
})();

class FirefoxPreferences extends BasePreferences {
  _writeToStorage(prefObj) {
    return new Promise(function(resolve) {
      FirefoxCom.request('setPreferences', prefObj, resolve);
    });
  }

  _readFromStorage(prefObj) {
    return new Promise(function(resolve) {
      FirefoxCom.request('getPreferences', prefObj, function (prefStr) {
        var readPrefs = JSON.parse(prefStr);
        resolve(readPrefs);
      });
    });
  }
}

(function listenFindEvents() {
  var events = [
    'find',
    'findagain',
    'findhighlightallchange',
    'findcasesensitivitychange'
  ];
  var handleEvent = function (evt) {
    if (!PDFViewerApplication.initialized) {
      return;
    }
    PDFViewerApplication.eventBus.dispatch('find', {
      source: window,
      type: evt.type.substring('find'.length),
      query: evt.detail.query,
      phraseSearch: true,
      caseSensitive: !!evt.detail.caseSensitive,
      highlightAll: !!evt.detail.highlightAll,
      findPrevious: !!evt.detail.findPrevious
    });
  };

  for (var i = 0, len = events.length; i < len; i++) {
    window.addEventListener(events[i], handleEvent);
  }
})();

function FirefoxComDataRangeTransport(length, initialData) {
  PDFDataRangeTransport.call(this, length, initialData);
}
FirefoxComDataRangeTransport.prototype =
  Object.create(PDFDataRangeTransport.prototype);
FirefoxComDataRangeTransport.prototype.requestDataRange =
    function FirefoxComDataRangeTransport_requestDataRange(begin, end) {
  FirefoxCom.request('requestDataRange', { begin, end, });
};
FirefoxComDataRangeTransport.prototype.abort =
    function FirefoxComDataRangeTransport_abort() {
  // Sync call to ensure abort is really started.
  FirefoxCom.requestSync('abortLoading', null);
};

PDFViewerApplication.externalServices = {
  updateFindControlState(data) {
    FirefoxCom.request('updateFindControlState', data);
  },

  initPassiveLoading(callbacks) {
    var pdfDataRangeTransport;

    window.addEventListener('message', function windowMessage(e) {
      if (e.source !== null) {
        // The message MUST originate from Chrome code.
        console.warn('Rejected untrusted message from ' + e.origin);
        return;
      }
      var args = e.data;

      if (typeof args !== 'object' || !('pdfjsLoadAction' in args)) {
        return;
      }
      switch (args.pdfjsLoadAction) {
        case 'supportsRangedLoading':
          pdfDataRangeTransport =
            new FirefoxComDataRangeTransport(args.length, args.data);

          callbacks.onOpenWithTransport(args.pdfUrl, args.length,
                                        pdfDataRangeTransport);
          break;
        case 'range':
          pdfDataRangeTransport.onDataRange(args.begin, args.chunk);
          break;
        case 'rangeProgress':
          pdfDataRangeTransport.onDataProgress(args.loaded);
          break;
        case 'progressiveRead':
          pdfDataRangeTransport.onDataProgressiveRead(args.chunk);
          break;
        case 'progress':
          callbacks.onProgress(args.loaded, args.total);
          break;
        case 'complete':
          if (!args.data) {
            callbacks.onError(args.errorCode);
            break;
          }
          callbacks.onOpenWithData(args.data);
          break;
      }
    });
    FirefoxCom.requestSync('initPassiveLoading', null);
  },

  fallback(data, callback) {
    FirefoxCom.request('fallback', data, callback);
  },

  reportTelemetry(data) {
    FirefoxCom.request('reportTelemetry', JSON.stringify(data));
  },

  createDownloadManager() {
    return new DownloadManager();
  },

  createPreferences() {
    return new FirefoxPreferences();
  },

  get supportsIntegratedFind() {
    var support = FirefoxCom.requestSync('supportsIntegratedFind');
    return shadow(this, 'supportsIntegratedFind', support);
  },

  get supportsDocumentFonts() {
    var support = FirefoxCom.requestSync('supportsDocumentFonts');
    return shadow(this, 'supportsDocumentFonts', support);
  },

  get supportsDocumentColors() {
    var support = FirefoxCom.requestSync('supportsDocumentColors');
    return shadow(this, 'supportsDocumentColors', support);
  },

  get supportedMouseWheelZoomModifierKeys() {
    var support = FirefoxCom.requestSync('supportedMouseWheelZoomModifierKeys');
    return shadow(this, 'supportedMouseWheelZoomModifierKeys', support);
  },
};

// l10n.js for Firefox extension expects services to be set.
document.mozL10n.setExternalLocalizerServices({
  getLocale() {
    return FirefoxCom.requestSync('getLocale', null);
  },

  getStrings(key) {
    return FirefoxCom.requestSync('getStrings', key);
  }
});

export {
  DownloadManager,
  FirefoxCom,
};