pdfjs-dist/lib/display/dom_utils.js

/* Copyright 2017 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.
 */
'use strict';
var sharedUtil = require('../shared/util.js');
var assert = sharedUtil.assert;
var removeNullCharacters = sharedUtil.removeNullCharacters;
var warn = sharedUtil.warn;
var deprecated = sharedUtil.deprecated;
var createValidAbsoluteUrl = sharedUtil.createValidAbsoluteUrl;
var stringToBytes = sharedUtil.stringToBytes;
var CMapCompressionType = sharedUtil.CMapCompressionType;
var DEFAULT_LINK_REL = 'noopener noreferrer nofollow';
function DOMCanvasFactory() {
}
DOMCanvasFactory.prototype = {
 create: function DOMCanvasFactory_create(width, height) {
  assert(width > 0 && height > 0, 'invalid canvas size');
  var canvas = document.createElement('canvas');
  var context = canvas.getContext('2d');
  canvas.width = width;
  canvas.height = height;
  return {
   canvas: canvas,
   context: context
  };
 },
 reset: function DOMCanvasFactory_reset(canvasAndContextPair, width, height) {
  assert(canvasAndContextPair.canvas, 'canvas is not specified');
  assert(width > 0 && height > 0, 'invalid canvas size');
  canvasAndContextPair.canvas.width = width;
  canvasAndContextPair.canvas.height = height;
 },
 destroy: function DOMCanvasFactory_destroy(canvasAndContextPair) {
  assert(canvasAndContextPair.canvas, 'canvas is not specified');
  canvasAndContextPair.canvas.width = 0;
  canvasAndContextPair.canvas.height = 0;
  canvasAndContextPair.canvas = null;
  canvasAndContextPair.context = null;
 }
};
var DOMCMapReaderFactory = function DOMCMapReaderFactoryClosure() {
 function DOMCMapReaderFactory(params) {
  this.baseUrl = params.baseUrl || null;
  this.isCompressed = params.isCompressed || false;
 }
 DOMCMapReaderFactory.prototype = {
  fetch: function (params) {
   if (!params.name) {
    return Promise.reject(new Error('CMap name must be specified.'));
   }
   return new Promise(function (resolve, reject) {
    var url = this.baseUrl + params.name;
    var request = new XMLHttpRequest();
    if (this.isCompressed) {
     url += '.bcmap';
     request.responseType = 'arraybuffer';
    }
    request.onreadystatechange = function () {
     if (request.readyState === XMLHttpRequest.DONE && (request.status === 200 || request.status === 0)) {
      var data;
      if (this.isCompressed && request.response) {
       data = new Uint8Array(request.response);
      } else if (!this.isCompressed && request.responseText) {
       data = stringToBytes(request.responseText);
      }
      if (data) {
       resolve({
        cMapData: data,
        compressionType: this.isCompressed ? CMapCompressionType.BINARY : CMapCompressionType.NONE
       });
       return;
      }
      reject(new Error('Unable to load ' + (this.isCompressed ? 'binary' : '') + ' CMap at: ' + url));
     }
    }.bind(this);
    request.open('GET', url, true);
    request.send(null);
   }.bind(this));
  }
 };
 return DOMCMapReaderFactory;
}();
var CustomStyle = function CustomStyleClosure() {
 var prefixes = [
  'ms',
  'Moz',
  'Webkit',
  'O'
 ];
 var _cache = Object.create(null);
 function CustomStyle() {
 }
 CustomStyle.getProp = function get(propName, element) {
  if (arguments.length === 1 && typeof _cache[propName] === 'string') {
   return _cache[propName];
  }
  element = element || document.documentElement;
  var style = element.style, prefixed, uPropName;
  if (typeof style[propName] === 'string') {
   return _cache[propName] = propName;
  }
  uPropName = propName.charAt(0).toUpperCase() + propName.slice(1);
  for (var i = 0, l = prefixes.length; i < l; i++) {
   prefixed = prefixes[i] + uPropName;
   if (typeof style[prefixed] === 'string') {
    return _cache[propName] = prefixed;
   }
  }
  return _cache[propName] = 'undefined';
 };
 CustomStyle.setProp = function set(propName, element, str) {
  var prop = this.getProp(propName);
  if (prop !== 'undefined') {
   element.style[prop] = str;
  }
 };
 return CustomStyle;
}();
var hasCanvasTypedArrays;
hasCanvasTypedArrays = function hasCanvasTypedArrays() {
 var canvas = document.createElement('canvas');
 canvas.width = canvas.height = 1;
 var ctx = canvas.getContext('2d');
 var imageData = ctx.createImageData(1, 1);
 return typeof imageData.data.buffer !== 'undefined';
};
var LinkTarget = {
 NONE: 0,
 SELF: 1,
 BLANK: 2,
 PARENT: 3,
 TOP: 4
};
var LinkTargetStringMap = [
 '',
 '_self',
 '_blank',
 '_parent',
 '_top'
];
function addLinkAttributes(link, params) {
 var url = params && params.url;
 link.href = link.title = url ? removeNullCharacters(url) : '';
 if (url) {
  var target = params.target;
  if (typeof target === 'undefined') {
   target = getDefaultSetting('externalLinkTarget');
  }
  link.target = LinkTargetStringMap[target];
  var rel = params.rel;
  if (typeof rel === 'undefined') {
   rel = getDefaultSetting('externalLinkRel');
  }
  link.rel = rel;
 }
}
function getFilenameFromUrl(url) {
 var anchor = url.indexOf('#');
 var query = url.indexOf('?');
 var end = Math.min(anchor > 0 ? anchor : url.length, query > 0 ? query : url.length);
 return url.substring(url.lastIndexOf('/', end) + 1, end);
}
function getDefaultSetting(id) {
 var globalSettings = sharedUtil.globalScope.PDFJS;
 switch (id) {
 case 'pdfBug':
  return globalSettings ? globalSettings.pdfBug : false;
 case 'disableAutoFetch':
  return globalSettings ? globalSettings.disableAutoFetch : false;
 case 'disableStream':
  return globalSettings ? globalSettings.disableStream : false;
 case 'disableRange':
  return globalSettings ? globalSettings.disableRange : false;
 case 'disableFontFace':
  return globalSettings ? globalSettings.disableFontFace : false;
 case 'disableCreateObjectURL':
  return globalSettings ? globalSettings.disableCreateObjectURL : false;
 case 'disableWebGL':
  return globalSettings ? globalSettings.disableWebGL : true;
 case 'cMapUrl':
  return globalSettings ? globalSettings.cMapUrl : null;
 case 'cMapPacked':
  return globalSettings ? globalSettings.cMapPacked : false;
 case 'postMessageTransfers':
  return globalSettings ? globalSettings.postMessageTransfers : true;
 case 'workerPort':
  return globalSettings ? globalSettings.workerPort : null;
 case 'workerSrc':
  return globalSettings ? globalSettings.workerSrc : null;
 case 'disableWorker':
  return globalSettings ? globalSettings.disableWorker : false;
 case 'maxImageSize':
  return globalSettings ? globalSettings.maxImageSize : -1;
 case 'imageResourcesPath':
  return globalSettings ? globalSettings.imageResourcesPath : '';
 case 'isEvalSupported':
  return globalSettings ? globalSettings.isEvalSupported : true;
 case 'externalLinkTarget':
  if (!globalSettings) {
   return LinkTarget.NONE;
  }
  switch (globalSettings.externalLinkTarget) {
  case LinkTarget.NONE:
  case LinkTarget.SELF:
  case LinkTarget.BLANK:
  case LinkTarget.PARENT:
  case LinkTarget.TOP:
   return globalSettings.externalLinkTarget;
  }
  warn('PDFJS.externalLinkTarget is invalid: ' + globalSettings.externalLinkTarget);
  globalSettings.externalLinkTarget = LinkTarget.NONE;
  return LinkTarget.NONE;
 case 'externalLinkRel':
  return globalSettings ? globalSettings.externalLinkRel : DEFAULT_LINK_REL;
 case 'enableStats':
  return !!(globalSettings && globalSettings.enableStats);
 default:
  throw new Error('Unknown default setting: ' + id);
 }
}
function isExternalLinkTargetSet() {
 var externalLinkTarget = getDefaultSetting('externalLinkTarget');
 switch (externalLinkTarget) {
 case LinkTarget.NONE:
  return false;
 case LinkTarget.SELF:
 case LinkTarget.BLANK:
 case LinkTarget.PARENT:
 case LinkTarget.TOP:
  return true;
 }
}
function isValidUrl(url, allowRelative) {
 deprecated('isValidUrl(), please use createValidAbsoluteUrl() instead.');
 var baseUrl = allowRelative ? 'http://example.com' : null;
 return createValidAbsoluteUrl(url, baseUrl) !== null;
}
exports.CustomStyle = CustomStyle;
exports.addLinkAttributes = addLinkAttributes;
exports.isExternalLinkTargetSet = isExternalLinkTargetSet;
exports.isValidUrl = isValidUrl;
exports.getFilenameFromUrl = getFilenameFromUrl;
exports.LinkTarget = LinkTarget;
exports.hasCanvasTypedArrays = hasCanvasTypedArrays;
exports.getDefaultSetting = getDefaultSetting;
exports.DEFAULT_LINK_REL = DEFAULT_LINK_REL;
exports.DOMCanvasFactory = DOMCanvasFactory;
exports.DOMCMapReaderFactory = DOMCMapReaderFactory;