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worker.js
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worker.js
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/**
* @licstart The following is the entire license notice for the
* Javascript code in this page
*
* 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.
*
* @licend The above is the entire license notice for the
* Javascript code in this page
*/
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.WorkerMessageHandler = exports.WorkerTask = undefined;
var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();
var _util = require('../shared/util');
var _pdf_manager = require('./pdf_manager');
var _is_node = require('../shared/is_node');
var _is_node2 = _interopRequireDefault(_is_node);
var _primitives = require('./primitives');
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
var WorkerTask = function WorkerTaskClosure() {
function WorkerTask(name) {
this.name = name;
this.terminated = false;
this._capability = (0, _util.createPromiseCapability)();
}
WorkerTask.prototype = {
get finished() {
return this._capability.promise;
},
finish: function finish() {
this._capability.resolve();
},
terminate: function terminate() {
this.terminated = true;
},
ensureNotTerminated: function ensureNotTerminated() {
if (this.terminated) {
throw new Error('Worker task was terminated');
}
}
};
return WorkerTask;
}();
;
var PDFWorkerStream = function PDFWorkerStreamClosure() {
function PDFWorkerStream(msgHandler) {
this._msgHandler = msgHandler;
this._contentLength = null;
this._fullRequestReader = null;
this._rangeRequestReaders = [];
}
PDFWorkerStream.prototype = {
getFullReader: function getFullReader() {
(0, _util.assert)(!this._fullRequestReader);
this._fullRequestReader = new PDFWorkerStreamReader(this._msgHandler);
return this._fullRequestReader;
},
getRangeReader: function getRangeReader(begin, end) {
var reader = new PDFWorkerStreamRangeReader(begin, end, this._msgHandler);
this._rangeRequestReaders.push(reader);
return reader;
},
cancelAllRequests: function cancelAllRequests(reason) {
if (this._fullRequestReader) {
this._fullRequestReader.cancel(reason);
}
var readers = this._rangeRequestReaders.slice(0);
readers.forEach(function (reader) {
reader.cancel(reason);
});
}
};
function PDFWorkerStreamReader(msgHandler) {
var _this = this;
this._msgHandler = msgHandler;
this._contentLength = null;
this._isRangeSupported = false;
this._isStreamingSupported = false;
var readableStream = this._msgHandler.sendWithStream('GetReader');
this._reader = readableStream.getReader();
this._headersReady = this._msgHandler.sendWithPromise('ReaderHeadersReady').then(function (data) {
_this._isStreamingSupported = data.isStreamingSupported;
_this._isRangeSupported = data.isRangeSupported;
_this._contentLength = data.contentLength;
});
}
PDFWorkerStreamReader.prototype = {
get headersReady() {
return this._headersReady;
},
get contentLength() {
return this._contentLength;
},
get isStreamingSupported() {
return this._isStreamingSupported;
},
get isRangeSupported() {
return this._isRangeSupported;
},
read: function read() {
return this._reader.read().then(function (_ref) {
var value = _ref.value,
done = _ref.done;
if (done) {
return {
value: undefined,
done: true
};
}
return {
value: value.buffer,
done: false
};
});
},
cancel: function cancel(reason) {
this._reader.cancel(reason);
}
};
function PDFWorkerStreamRangeReader(begin, end, msgHandler) {
this._msgHandler = msgHandler;
this.onProgress = null;
var readableStream = this._msgHandler.sendWithStream('GetRangeReader', {
begin: begin,
end: end
});
this._reader = readableStream.getReader();
}
PDFWorkerStreamRangeReader.prototype = {
get isStreamingSupported() {
return false;
},
read: function read() {
return this._reader.read().then(function (_ref2) {
var value = _ref2.value,
done = _ref2.done;
if (done) {
return {
value: undefined,
done: true
};
}
return {
value: value.buffer,
done: false
};
});
},
cancel: function cancel(reason) {
this._reader.cancel(reason);
}
};
return PDFWorkerStream;
}();
var WorkerMessageHandler = {
setup: function setup(handler, port) {
var testMessageProcessed = false;
handler.on('test', function wphSetupTest(data) {
if (testMessageProcessed) {
return;
}
testMessageProcessed = true;
if (!(data instanceof Uint8Array)) {
handler.send('test', 'main', false);
return;
}
var supportTransfers = data[0] === 255;
handler.postMessageTransfers = supportTransfers;
var xhr = new XMLHttpRequest();
var responseExists = 'response' in xhr;
try {
xhr.responseType;
} catch (e) {
responseExists = false;
}
if (!responseExists) {
handler.send('test', false);
return;
}
handler.send('test', {
supportTypedArray: true,
supportTransfers: supportTransfers
});
});
handler.on('configure', function wphConfigure(data) {
(0, _util.setVerbosityLevel)(data.verbosity);
});
handler.on('GetDocRequest', function wphSetupDoc(data) {
return WorkerMessageHandler.createDocumentHandler(data, port);
});
},
createDocumentHandler: function createDocumentHandler(docParams, port) {
var pdfManager;
var terminated = false;
var cancelXHRs = null;
var WorkerTasks = [];
var apiVersion = docParams.apiVersion;
var workerVersion = '2.0.478';
if (apiVersion !== null && apiVersion !== workerVersion) {
throw new Error('The API version "' + apiVersion + '" does not match ' + ('the Worker version "' + workerVersion + '".'));
}
var docId = docParams.docId;
var docBaseUrl = docParams.docBaseUrl;
var workerHandlerName = docParams.docId + '_worker';
var handler = new _util.MessageHandler(workerHandlerName, docId, port);
handler.postMessageTransfers = docParams.postMessageTransfers;
function ensureNotTerminated() {
if (terminated) {
throw new Error('Worker was terminated');
}
}
function startWorkerTask(task) {
WorkerTasks.push(task);
}
function finishWorkerTask(task) {
task.finish();
var i = WorkerTasks.indexOf(task);
WorkerTasks.splice(i, 1);
}
function loadDocument(recoveryMode) {
var loadDocumentCapability = (0, _util.createPromiseCapability)();
var parseSuccess = function parseSuccess() {
Promise.all([pdfManager.ensureDoc('numPages'), pdfManager.ensureDoc('fingerprint')]).then(function (_ref3) {
var _ref4 = _slicedToArray(_ref3, 2),
numPages = _ref4[0],
fingerprint = _ref4[1];
loadDocumentCapability.resolve({
numPages: numPages,
fingerprint: fingerprint
});
}, parseFailure);
};
var parseFailure = function parseFailure(e) {
loadDocumentCapability.reject(e);
};
pdfManager.ensureDoc('checkHeader', []).then(function () {
pdfManager.ensureDoc('parseStartXRef', []).then(function () {
pdfManager.ensureDoc('parse', [recoveryMode]).then(parseSuccess, parseFailure);
}, parseFailure);
}, parseFailure);
return loadDocumentCapability.promise;
}
function getPdfManager(data, evaluatorOptions) {
var pdfManagerCapability = (0, _util.createPromiseCapability)();
var pdfManager;
var source = data.source;
if (source.data) {
try {
pdfManager = new _pdf_manager.LocalPdfManager(docId, source.data, source.password, evaluatorOptions, docBaseUrl);
pdfManagerCapability.resolve(pdfManager);
} catch (ex) {
pdfManagerCapability.reject(ex);
}
return pdfManagerCapability.promise;
}
var pdfStream,
cachedChunks = [];
try {
pdfStream = new PDFWorkerStream(handler);
} catch (ex) {
pdfManagerCapability.reject(ex);
return pdfManagerCapability.promise;
}
var fullRequest = pdfStream.getFullReader();
fullRequest.headersReady.then(function () {
if (!fullRequest.isRangeSupported) {
return;
}
var disableAutoFetch = source.disableAutoFetch || fullRequest.isStreamingSupported;
pdfManager = new _pdf_manager.NetworkPdfManager(docId, pdfStream, {
msgHandler: handler,
url: source.url,
password: source.password,
length: fullRequest.contentLength,
disableAutoFetch: disableAutoFetch,
rangeChunkSize: source.rangeChunkSize
}, evaluatorOptions, docBaseUrl);
for (var i = 0; i < cachedChunks.length; i++) {
pdfManager.sendProgressiveData(cachedChunks[i]);
}
cachedChunks = [];
pdfManagerCapability.resolve(pdfManager);
cancelXHRs = null;
}).catch(function (reason) {
pdfManagerCapability.reject(reason);
cancelXHRs = null;
});
var loaded = 0;
var flushChunks = function flushChunks() {
var pdfFile = (0, _util.arraysToBytes)(cachedChunks);
if (source.length && pdfFile.length !== source.length) {
(0, _util.warn)('reported HTTP length is different from actual');
}
try {
pdfManager = new _pdf_manager.LocalPdfManager(docId, pdfFile, source.password, evaluatorOptions, docBaseUrl);
pdfManagerCapability.resolve(pdfManager);
} catch (ex) {
pdfManagerCapability.reject(ex);
}
cachedChunks = [];
};
var readPromise = new Promise(function (resolve, reject) {
var readChunk = function readChunk(chunk) {
try {
ensureNotTerminated();
if (chunk.done) {
if (!pdfManager) {
flushChunks();
}
cancelXHRs = null;
return;
}
var data = chunk.value;
loaded += (0, _util.arrayByteLength)(data);
if (!fullRequest.isStreamingSupported) {
handler.send('DocProgress', {
loaded: loaded,
total: Math.max(loaded, fullRequest.contentLength || 0)
});
}
if (pdfManager) {
pdfManager.sendProgressiveData(data);
} else {
cachedChunks.push(data);
}
fullRequest.read().then(readChunk, reject);
} catch (e) {
reject(e);
}
};
fullRequest.read().then(readChunk, reject);
});
readPromise.catch(function (e) {
pdfManagerCapability.reject(e);
cancelXHRs = null;
});
cancelXHRs = function cancelXHRs() {
pdfStream.cancelAllRequests('abort');
};
return pdfManagerCapability.promise;
}
function setupDoc(data) {
function onSuccess(doc) {
ensureNotTerminated();
handler.send('GetDoc', { pdfInfo: doc });
}
function onFailure(e) {
ensureNotTerminated();
if (e instanceof _util.PasswordException) {
var task = new WorkerTask('PasswordException: response ' + e.code);
startWorkerTask(task);
handler.sendWithPromise('PasswordRequest', e).then(function (data) {
finishWorkerTask(task);
pdfManager.updatePassword(data.password);
pdfManagerReady();
}).catch(function (ex) {
finishWorkerTask(task);
handler.send('PasswordException', ex);
}.bind(null, e));
} else if (e instanceof _util.InvalidPDFException) {
handler.send('InvalidPDF', e);
} else if (e instanceof _util.MissingPDFException) {
handler.send('MissingPDF', e);
} else if (e instanceof _util.UnexpectedResponseException) {
handler.send('UnexpectedResponse', e);
} else {
handler.send('UnknownError', new _util.UnknownErrorException(e.message, e.toString()));
}
}
function pdfManagerReady() {
ensureNotTerminated();
loadDocument(false).then(onSuccess, function loadFailure(ex) {
ensureNotTerminated();
if (!(ex instanceof _util.XRefParseException)) {
onFailure(ex);
return;
}
pdfManager.requestLoadedStream();
pdfManager.onLoadedStream().then(function () {
ensureNotTerminated();
loadDocument(true).then(onSuccess, onFailure);
});
}, onFailure);
}
ensureNotTerminated();
var evaluatorOptions = {
forceDataSchema: data.disableCreateObjectURL,
maxImageSize: data.maxImageSize,
disableFontFace: data.disableFontFace,
nativeImageDecoderSupport: data.nativeImageDecoderSupport,
ignoreErrors: data.ignoreErrors,
isEvalSupported: data.isEvalSupported
};
getPdfManager(data, evaluatorOptions).then(function (newPdfManager) {
if (terminated) {
newPdfManager.terminate();
throw new Error('Worker was terminated');
}
pdfManager = newPdfManager;
handler.send('PDFManagerReady', null);
pdfManager.onLoadedStream().then(function (stream) {
handler.send('DataLoaded', { length: stream.bytes.byteLength });
});
}).then(pdfManagerReady, onFailure);
}
handler.on('GetPage', function wphSetupGetPage(data) {
return pdfManager.getPage(data.pageIndex).then(function (page) {
var rotatePromise = pdfManager.ensure(page, 'rotate');
var refPromise = pdfManager.ensure(page, 'ref');
var userUnitPromise = pdfManager.ensure(page, 'userUnit');
var viewPromise = pdfManager.ensure(page, 'view');
return Promise.all([rotatePromise, refPromise, userUnitPromise, viewPromise]).then(function (results) {
return {
rotate: results[0],
ref: results[1],
userUnit: results[2],
view: results[3]
};
});
});
});
handler.on('GetPageIndex', function wphSetupGetPageIndex(data) {
var ref = new _primitives.Ref(data.ref.num, data.ref.gen);
var catalog = pdfManager.pdfDocument.catalog;
return catalog.getPageIndex(ref);
});
handler.on('GetDestinations', function wphSetupGetDestinations(data) {
return pdfManager.ensureCatalog('destinations');
});
handler.on('GetDestination', function wphSetupGetDestination(data) {
return pdfManager.ensureCatalog('getDestination', [data.id]);
});
handler.on('GetPageLabels', function wphSetupGetPageLabels(data) {
return pdfManager.ensureCatalog('pageLabels');
});
handler.on('GetPageMode', function wphSetupGetPageMode(data) {
return pdfManager.ensureCatalog('pageMode');
});
handler.on('GetAttachments', function wphSetupGetAttachments(data) {
return pdfManager.ensureCatalog('attachments');
});
handler.on('GetJavaScript', function wphSetupGetJavaScript(data) {
return pdfManager.ensureCatalog('javaScript');
});
handler.on('GetOutline', function wphSetupGetOutline(data) {
return pdfManager.ensureCatalog('documentOutline');
});
handler.on('GetMetadata', function wphSetupGetMetadata(data) {
return Promise.all([pdfManager.ensureDoc('documentInfo'), pdfManager.ensureCatalog('metadata')]);
});
handler.on('GetData', function wphSetupGetData(data) {
pdfManager.requestLoadedStream();
return pdfManager.onLoadedStream().then(function (stream) {
return stream.bytes;
});
});
handler.on('GetStats', function wphSetupGetStats(data) {
return pdfManager.pdfDocument.xref.stats;
});
handler.on('GetAnnotations', function wphSetupGetAnnotations(data) {
return pdfManager.getPage(data.pageIndex).then(function (page) {
return pdfManager.ensure(page, 'getAnnotationsData', [data.intent]);
});
});
handler.on('RenderPageRequest', function wphSetupRenderPage(data) {
var pageIndex = data.pageIndex;
pdfManager.getPage(pageIndex).then(function (page) {
var task = new WorkerTask('RenderPageRequest: page ' + pageIndex);
startWorkerTask(task);
var pageNum = pageIndex + 1;
var start = Date.now();
page.getOperatorList({
handler: handler,
task: task,
intent: data.intent,
renderInteractiveForms: data.renderInteractiveForms
}).then(function (operatorList) {
finishWorkerTask(task);
(0, _util.info)('page=' + pageNum + ' - getOperatorList: time=' + (Date.now() - start) + 'ms, len=' + operatorList.totalLength);
}, function (e) {
finishWorkerTask(task);
if (task.terminated) {
return;
}
handler.send('UnsupportedFeature', { featureId: _util.UNSUPPORTED_FEATURES.unknown });
var minimumStackMessage = 'worker.js: while trying to getPage() and getOperatorList()';
var wrappedException;
if (typeof e === 'string') {
wrappedException = {
message: e,
stack: minimumStackMessage
};
} else if ((typeof e === 'undefined' ? 'undefined' : _typeof(e)) === 'object') {
wrappedException = {
message: e.message || e.toString(),
stack: e.stack || minimumStackMessage
};
} else {
wrappedException = {
message: 'Unknown exception type: ' + (typeof e === 'undefined' ? 'undefined' : _typeof(e)),
stack: minimumStackMessage
};
}
handler.send('PageError', {
pageNum: pageNum,
error: wrappedException,
intent: data.intent
});
});
});
}, this);
handler.on('GetTextContent', function wphExtractText(data, sink) {
var pageIndex = data.pageIndex;
sink.onPull = function (desiredSize) {};
sink.onCancel = function (reason) {};
pdfManager.getPage(pageIndex).then(function (page) {
var task = new WorkerTask('GetTextContent: page ' + pageIndex);
startWorkerTask(task);
var pageNum = pageIndex + 1;
var start = Date.now();
page.extractTextContent({
handler: handler,
task: task,
sink: sink,
normalizeWhitespace: data.normalizeWhitespace,
combineTextItems: data.combineTextItems
}).then(function () {
finishWorkerTask(task);
(0, _util.info)('text indexing: page=' + pageNum + ' - time=' + (Date.now() - start) + 'ms');
sink.close();
}, function (reason) {
finishWorkerTask(task);
if (task.terminated) {
return;
}
sink.error(reason);
throw reason;
});
});
});
handler.on('Cleanup', function wphCleanup(data) {
return pdfManager.cleanup();
});
handler.on('Terminate', function wphTerminate(data) {
terminated = true;
if (pdfManager) {
pdfManager.terminate();
pdfManager = null;
}
if (cancelXHRs) {
cancelXHRs();
}
var waitOn = [];
WorkerTasks.forEach(function (task) {
waitOn.push(task.finished);
task.terminate();
});
return Promise.all(waitOn).then(function () {
handler.destroy();
handler = null;
});
});
handler.on('Ready', function wphReady(data) {
setupDoc(docParams);
docParams = null;
});
return workerHandlerName;
},
initializeFromPort: function initializeFromPort(port) {
var handler = new _util.MessageHandler('worker', 'main', port);
WorkerMessageHandler.setup(handler, port);
handler.send('ready', null);
}
};
function isMessagePort(maybePort) {
return typeof maybePort.postMessage === 'function' && 'onmessage' in maybePort;
}
if (typeof window === 'undefined' && !(0, _is_node2.default)() && typeof self !== 'undefined' && isMessagePort(self)) {
WorkerMessageHandler.initializeFromPort(self);
}
exports.WorkerTask = WorkerTask;
exports.WorkerMessageHandler = WorkerMessageHandler;