| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 | /* 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'; Object.defineProperty(exports, "__esModule", { value: true }); exports.NetworkManager = exports.PDFNetworkStream = undefined; var _util = require('../shared/util'); var _network_utils = require('./network_utils'); var _global_scope = require('../shared/global_scope'); var _global_scope2 = _interopRequireDefault(_global_scope); function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } ; var OK_RESPONSE = 200; var PARTIAL_CONTENT_RESPONSE = 206; function NetworkManager(url, args) { this.url = url; args = args || {}; this.isHttp = /^https?:/i.test(url); this.httpHeaders = this.isHttp && args.httpHeaders || {}; this.withCredentials = args.withCredentials || false; this.getXhr = args.getXhr || function NetworkManager_getXhr() { return new XMLHttpRequest(); }; this.currXhrId = 0; this.pendingRequests = Object.create(null); this.loadedRequests = Object.create(null); } function getArrayBuffer(xhr) { var data = xhr.response; if (typeof data !== 'string') { return data; } var array = (0, _util.stringToBytes)(data); return array.buffer; } var supportsMozChunked = function supportsMozChunkedClosure() { try { var x = new XMLHttpRequest(); x.open('GET', _global_scope2.default.location.href); x.responseType = 'moz-chunked-arraybuffer'; return x.responseType === 'moz-chunked-arraybuffer'; } catch (e) { return false; } }(); NetworkManager.prototype = { requestRange: function NetworkManager_requestRange(begin, end, listeners) { var args = { begin: begin, end: end }; for (var prop in listeners) { args[prop] = listeners[prop]; } return this.request(args); }, requestFull: function NetworkManager_requestFull(listeners) { return this.request(listeners); }, request: function NetworkManager_request(args) { var xhr = this.getXhr(); var xhrId = this.currXhrId++; var pendingRequest = this.pendingRequests[xhrId] = { xhr: xhr }; xhr.open('GET', this.url); xhr.withCredentials = this.withCredentials; for (var property in this.httpHeaders) { var value = this.httpHeaders[property]; if (typeof value === 'undefined') { continue; } xhr.setRequestHeader(property, value); } if (this.isHttp && 'begin' in args && 'end' in args) { var rangeStr = args.begin + '-' + (args.end - 1); xhr.setRequestHeader('Range', 'bytes=' + rangeStr); pendingRequest.expectedStatus = 206; } else { pendingRequest.expectedStatus = 200; } var useMozChunkedLoading = supportsMozChunked && !!args.onProgressiveData; if (useMozChunkedLoading) { xhr.responseType = 'moz-chunked-arraybuffer'; pendingRequest.onProgressiveData = args.onProgressiveData; pendingRequest.mozChunked = true; } else { xhr.responseType = 'arraybuffer'; } if (args.onError) { xhr.onerror = function (evt) { args.onError(xhr.status); }; } xhr.onreadystatechange = this.onStateChange.bind(this, xhrId); xhr.onprogress = this.onProgress.bind(this, xhrId); pendingRequest.onHeadersReceived = args.onHeadersReceived; pendingRequest.onDone = args.onDone; pendingRequest.onError = args.onError; pendingRequest.onProgress = args.onProgress; xhr.send(null); return xhrId; }, onProgress: function NetworkManager_onProgress(xhrId, evt) { var pendingRequest = this.pendingRequests[xhrId]; if (!pendingRequest) { return; } if (pendingRequest.mozChunked) { var chunk = getArrayBuffer(pendingRequest.xhr); pendingRequest.onProgressiveData(chunk); } var onProgress = pendingRequest.onProgress; if (onProgress) { onProgress(evt); } }, onStateChange: function NetworkManager_onStateChange(xhrId, evt) { var pendingRequest = this.pendingRequests[xhrId]; if (!pendingRequest) { return; } var xhr = pendingRequest.xhr; if (xhr.readyState >= 2 && pendingRequest.onHeadersReceived) { pendingRequest.onHeadersReceived(); delete pendingRequest.onHeadersReceived; } if (xhr.readyState !== 4) { return; } if (!(xhrId in this.pendingRequests)) { return; } delete this.pendingRequests[xhrId]; if (xhr.status === 0 && this.isHttp) { if (pendingRequest.onError) { pendingRequest.onError(xhr.status); } return; } var xhrStatus = xhr.status || OK_RESPONSE; var ok_response_on_range_request = xhrStatus === OK_RESPONSE && pendingRequest.expectedStatus === PARTIAL_CONTENT_RESPONSE; if (!ok_response_on_range_request && xhrStatus !== pendingRequest.expectedStatus) { if (pendingRequest.onError) { pendingRequest.onError(xhr.status); } return; } this.loadedRequests[xhrId] = true; var chunk = getArrayBuffer(xhr); if (xhrStatus === PARTIAL_CONTENT_RESPONSE) { var rangeHeader = xhr.getResponseHeader('Content-Range'); var matches = /bytes (\d+)-(\d+)\/(\d+)/.exec(rangeHeader); var begin = parseInt(matches[1], 10); pendingRequest.onDone({ begin: begin, chunk: chunk }); } else if (pendingRequest.onProgressiveData) { pendingRequest.onDone(null); } else if (chunk) { pendingRequest.onDone({ begin: 0, chunk: chunk }); } else if (pendingRequest.onError) { pendingRequest.onError(xhr.status); } }, hasPendingRequests: function NetworkManager_hasPendingRequests() { for (var xhrId in this.pendingRequests) { return true; } return false; }, getRequestXhr: function NetworkManager_getXhr(xhrId) { return this.pendingRequests[xhrId].xhr; }, isStreamingRequest: function NetworkManager_isStreamingRequest(xhrId) { return !!this.pendingRequests[xhrId].onProgressiveData; }, isPendingRequest: function NetworkManager_isPendingRequest(xhrId) { return xhrId in this.pendingRequests; }, isLoadedRequest: function NetworkManager_isLoadedRequest(xhrId) { return xhrId in this.loadedRequests; }, abortAllRequests: function NetworkManager_abortAllRequests() { for (var xhrId in this.pendingRequests) { this.abortRequest(xhrId | 0); } }, abortRequest: function NetworkManager_abortRequest(xhrId) { var xhr = this.pendingRequests[xhrId].xhr; delete this.pendingRequests[xhrId]; xhr.abort(); } }; function PDFNetworkStream(source) { this._source = source; this._manager = new NetworkManager(source.url, { httpHeaders: source.httpHeaders, withCredentials: source.withCredentials }); this._rangeChunkSize = source.rangeChunkSize; this._fullRequestReader = null; this._rangeRequestReaders = []; } PDFNetworkStream.prototype = { _onRangeRequestReaderClosed: function PDFNetworkStream_onRangeRequestReaderClosed(reader) { var i = this._rangeRequestReaders.indexOf(reader); if (i >= 0) { this._rangeRequestReaders.splice(i, 1); } }, getFullReader: function PDFNetworkStream_getFullReader() { (0, _util.assert)(!this._fullRequestReader); this._fullRequestReader = new PDFNetworkStreamFullRequestReader(this._manager, this._source); return this._fullRequestReader; }, getRangeReader: function PDFNetworkStream_getRangeReader(begin, end) { var reader = new PDFNetworkStreamRangeRequestReader(this._manager, begin, end); reader.onClosed = this._onRangeRequestReaderClosed.bind(this); this._rangeRequestReaders.push(reader); return reader; }, cancelAllRequests: function PDFNetworkStream_cancelAllRequests(reason) { if (this._fullRequestReader) { this._fullRequestReader.cancel(reason); } var readers = this._rangeRequestReaders.slice(0); readers.forEach(function (reader) { reader.cancel(reason); }); } }; function PDFNetworkStreamFullRequestReader(manager, source) { this._manager = manager; var args = { onHeadersReceived: this._onHeadersReceived.bind(this), onProgressiveData: source.disableStream ? null : this._onProgressiveData.bind(this), onDone: this._onDone.bind(this), onError: this._onError.bind(this), onProgress: this._onProgress.bind(this) }; this._url = source.url; this._fullRequestId = manager.requestFull(args); this._headersReceivedCapability = (0, _util.createPromiseCapability)(); this._disableRange = source.disableRange || false; this._contentLength = source.length; this._rangeChunkSize = source.rangeChunkSize; if (!this._rangeChunkSize && !this._disableRange) { this._disableRange = true; } this._isStreamingSupported = false; this._isRangeSupported = false; this._cachedChunks = []; this._requests = []; this._done = false; this._storedError = undefined; this.onProgress = null; } PDFNetworkStreamFullRequestReader.prototype = { _onHeadersReceived: function PDFNetworkStreamFullRequestReader_onHeadersReceived() { var fullRequestXhrId = this._fullRequestId; var fullRequestXhr = this._manager.getRequestXhr(fullRequestXhrId); var _validateRangeRequest = (0, _network_utils.validateRangeRequestCapabilities)({ getResponseHeader: function getResponseHeader(name) { return fullRequestXhr.getResponseHeader(name); }, isHttp: this._manager.isHttp, rangeChunkSize: this._rangeChunkSize, disableRange: this._disableRange }), allowRangeRequests = _validateRangeRequest.allowRangeRequests, suggestedLength = _validateRangeRequest.suggestedLength; this._contentLength = suggestedLength || this._contentLength; if (allowRangeRequests) { this._isRangeSupported = true; } var networkManager = this._manager; if (networkManager.isStreamingRequest(fullRequestXhrId)) { this._isStreamingSupported = true; } else if (this._isRangeSupported) { networkManager.abortRequest(fullRequestXhrId); } this._headersReceivedCapability.resolve(); }, _onProgressiveData: function PDFNetworkStreamFullRequestReader_onProgressiveData(chunk) { if (this._requests.length > 0) { var requestCapability = this._requests.shift(); requestCapability.resolve({ value: chunk, done: false }); } else { this._cachedChunks.push(chunk); } }, _onDone: function PDFNetworkStreamFullRequestReader_onDone(args) { if (args) { this._onProgressiveData(args.chunk); } this._done = true; if (this._cachedChunks.length > 0) { return; } this._requests.forEach(function (requestCapability) { requestCapability.resolve({ value: undefined, done: true }); }); this._requests = []; }, _onError: function PDFNetworkStreamFullRequestReader_onError(status) { var url = this._url; var exception = (0, _network_utils.createResponseStatusError)(status, url); this._storedError = exception; this._headersReceivedCapability.reject(exception); this._requests.forEach(function (requestCapability) { requestCapability.reject(exception); }); this._requests = []; this._cachedChunks = []; }, _onProgress: function PDFNetworkStreamFullRequestReader_onProgress(data) { if (this.onProgress) { this.onProgress({ loaded: data.loaded, total: data.lengthComputable ? data.total : this._contentLength }); } }, get isRangeSupported() { return this._isRangeSupported; }, get isStreamingSupported() { return this._isStreamingSupported; }, get contentLength() { return this._contentLength; }, get headersReady() { return this._headersReceivedCapability.promise; }, read: function PDFNetworkStreamFullRequestReader_read() { if (this._storedError) { return Promise.reject(this._storedError); } if (this._cachedChunks.length > 0) { var chunk = this._cachedChunks.shift(); return Promise.resolve({ value: chunk, done: false }); } if (this._done) { return Promise.resolve({ value: undefined, done: true }); } var requestCapability = (0, _util.createPromiseCapability)(); this._requests.push(requestCapability); return requestCapability.promise; }, cancel: function PDFNetworkStreamFullRequestReader_cancel(reason) { this._done = true; this._headersReceivedCapability.reject(reason); this._requests.forEach(function (requestCapability) { requestCapability.resolve({ value: undefined, done: true }); }); this._requests = []; if (this._manager.isPendingRequest(this._fullRequestId)) { this._manager.abortRequest(this._fullRequestId); } this._fullRequestReader = null; } }; function PDFNetworkStreamRangeRequestReader(manager, begin, end) { this._manager = manager; var args = { onDone: this._onDone.bind(this), onProgress: this._onProgress.bind(this) }; this._requestId = manager.requestRange(begin, end, args); this._requests = []; this._queuedChunk = null; this._done = false; this.onProgress = null; this.onClosed = null; } PDFNetworkStreamRangeRequestReader.prototype = { _close: function PDFNetworkStreamRangeRequestReader_close() { if (this.onClosed) { this.onClosed(this); } }, _onDone: function PDFNetworkStreamRangeRequestReader_onDone(data) { var chunk = data.chunk; if (this._requests.length > 0) { var requestCapability = this._requests.shift(); requestCapability.resolve({ value: chunk, done: false }); } else { this._queuedChunk = chunk; } this._done = true; this._requests.forEach(function (requestCapability) { requestCapability.resolve({ value: undefined, done: true }); }); this._requests = []; this._close(); }, _onProgress: function PDFNetworkStreamRangeRequestReader_onProgress(evt) { if (!this.isStreamingSupported && this.onProgress) { this.onProgress({ loaded: evt.loaded }); } }, get isStreamingSupported() { return false; }, read: function PDFNetworkStreamRangeRequestReader_read() { if (this._queuedChunk !== null) { var chunk = this._queuedChunk; this._queuedChunk = null; return Promise.resolve({ value: chunk, done: false }); } if (this._done) { return Promise.resolve({ value: undefined, done: true }); } var requestCapability = (0, _util.createPromiseCapability)(); this._requests.push(requestCapability); return requestCapability.promise; }, cancel: function PDFNetworkStreamRangeRequestReader_cancel(reason) { this._done = true; this._requests.forEach(function (requestCapability) { requestCapability.resolve({ value: undefined, done: true }); }); this._requests = []; if (this._manager.isPendingRequest(this._requestId)) { this._manager.abortRequest(this._requestId); } this._close(); } }; exports.PDFNetworkStream = PDFNetworkStream; exports.NetworkManager = NetworkManager; |