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Adds fetch stream logic for networking part of PDF.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,222 @@ | ||
| /* 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 { assert, createPromiseCapability } from '../shared/util'; | ||
| import { | ||
| createResponseStatusError, validateRangeRequestCapabilities, | ||
| validateResponseStatus | ||
| } from './network_utils'; | ||
|
|
||
| function createFetchOptions(headers, withCredentials) { | ||
| return { | ||
| method: 'GET', | ||
| headers, | ||
| mode: 'cors', | ||
| credentials: withCredentials ? 'omit' : 'include', | ||
| redirect: 'follow', | ||
| }; | ||
| } | ||
|
|
||
| class PDFFetchStream { | ||
| constructor(options) { | ||
| this.options = options; | ||
| this.source = options.source; | ||
| this.isHttp = /^https?:/i.test(this.source.url); | ||
| this.httpHeaders = (this.isHttp && this.source.httpHeaders) || {}; | ||
|
|
||
| this._fullRequestReader = null; | ||
| this._rangeRequestReaders = []; | ||
| } | ||
|
|
||
| getFullReader() { | ||
| assert(!this._fullRequestReader); | ||
| this._fullRequestReader = new PDFFetchStreamReader(this); | ||
| return this._fullRequestReader; | ||
| } | ||
|
|
||
| getRangeReader(begin, end) { | ||
| let reader = new PDFFetchStreamRangeReader(this, begin, end); | ||
| this._rangeRequestReaders.push(reader); | ||
| return reader; | ||
| } | ||
|
|
||
| cancelAllRequests(reason) { | ||
| if (this._fullRequestReader) { | ||
| this._fullRequestReader.cancel(reason); | ||
| } | ||
| let readers = this._rangeRequestReaders.slice(0); | ||
| readers.forEach(function(reader) { | ||
| reader.cancel(reason); | ||
| }); | ||
| } | ||
| } | ||
|
|
||
| class PDFFetchStreamReader { | ||
| constructor(stream) { | ||
| this._stream = stream; | ||
| this._reader = null; | ||
| this._loaded = 0; | ||
| this._withCredentials = stream.source.withCredentials; | ||
| this._contentLength = this._stream.source.length; | ||
| this._headersCapability = createPromiseCapability(); | ||
| this._disableRange = this._stream.options.disableRange; | ||
| this._rangeChunkSize = this._stream.source.rangeChunkSize; | ||
| if (!this._rangeChunkSize && !this._disableRange) { | ||
| this._disableRange = true; | ||
| } | ||
|
|
||
| this._isRangeSupported = !this._stream.options.disableRange; | ||
| this._isStreamingSupported = !this._stream.source.disableStream; | ||
|
|
||
| this._headers = new Headers(); | ||
| for (let property in this._stream.httpHeaders) { | ||
| let value = this._stream.httpHeaders[property]; | ||
| if (typeof value === 'undefined') { | ||
| continue; | ||
| } | ||
| this._headers.append(property, value); | ||
| } | ||
|
|
||
| let url = this._stream.source.url; | ||
| fetch(url, createFetchOptions(this._headers, this._withCredentials)). | ||
| then((response) => { | ||
| if (!validateResponseStatus(response.status, this._stream.isHttp)) { | ||
| throw createResponseStatusError(response.status, url); | ||
| } | ||
| this._headersCapability.resolve(); | ||
| this._reader = response.body.getReader(); | ||
|
|
||
| let { allowRangeRequests, suggestedLength, } = | ||
| validateRangeRequestCapabilities({ | ||
| getResponseHeader: (name) => { | ||
| return response.headers.get(name); | ||
| }, | ||
| isHttp: this._stream.isHttp, | ||
| rangeChunkSize: this._rangeChunkSize, | ||
| disableRange: this._disableRange, | ||
| }); | ||
|
|
||
| this._contentLength = suggestedLength; | ||
| this._isRangeSupported = allowRangeRequests; | ||
| }).catch(this._headersCapability.reject); | ||
|
|
||
| this.onProgress = null; | ||
| } | ||
|
|
||
| get headersReady() { | ||
| return this._headersCapability.promise; | ||
| } | ||
|
|
||
| get contentLength() { | ||
| return this._contentLength; | ||
| } | ||
|
|
||
| get isRangeSupported() { | ||
| return this._isRangeSupported; | ||
| } | ||
|
|
||
| get isStreamingSupported() { | ||
| return this._isStreamingSupported; | ||
| } | ||
|
|
||
| read() { | ||
| return this._headersCapability.promise.then(() => { | ||
| return this._reader.read().then(({ value, done, }) => { | ||
| if (done) { | ||
| return Promise.resolve({ value, done, }); | ||
| } | ||
| this._loaded += value.byteLength; | ||
| if (this.onProgress) { | ||
| this.onProgress({ | ||
| loaded: this._loaded, | ||
| total: this._contentLength, | ||
| }); | ||
| } | ||
| let buffer = new Uint8Array(value).buffer; | ||
| return Promise.resolve({ value: buffer, done: false, }); | ||
| }); | ||
| }); | ||
| } | ||
|
|
||
| cancel(reason) { | ||
| if (this._reader) { | ||
| this._reader.cancel(reason); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| class PDFFetchStreamRangeReader { | ||
| constructor(stream, begin, end) { | ||
| this._stream = stream; | ||
| this._reader = null; | ||
| this._loaded = 0; | ||
| this._withCredentials = stream.source.withCredentials; | ||
| this._readCapability = createPromiseCapability(); | ||
| this._isStreamingSupported = !stream.source.disableStream; | ||
|
|
||
| this._headers = new Headers(); | ||
| for (let property in this._stream.httpHeaders) { | ||
| let value = this._stream.httpHeaders[property]; | ||
| if (typeof value === 'undefined') { | ||
| continue; | ||
| } | ||
| this._headers.append(property, value); | ||
| } | ||
|
|
||
| let rangeStr = begin + '-' + (end - 1); | ||
| this._headers.append('Range', 'bytes=' + rangeStr); | ||
| let url = this._stream.source.url; | ||
| fetch(url, createFetchOptions(this._headers, this._withCredentials)). | ||
| then((response) => { | ||
| if (!validateResponseStatus(response.status, this._stream.isHttp)) { | ||
| throw createResponseStatusError(response.status, url); | ||
| } | ||
| this._readCapability.resolve(); | ||
| this._reader = response.body.getReader(); | ||
| }); | ||
|
|
||
| this.onProgress = null; | ||
| } | ||
|
|
||
| get isStreamingSupported() { | ||
| return this._isStreamingSupported; | ||
| } | ||
|
|
||
| read() { | ||
| return this._readCapability.promise.then(() => { | ||
| return this._reader.read().then(({ value, done, }) => { | ||
| if (done) { | ||
| return Promise.resolve({ value, done, }); | ||
| } | ||
| this._loaded += value.byteLength; | ||
| if (this.onProgress) { | ||
| this.onProgress({ loaded: this._loaded, }); | ||
| } | ||
| let buffer = new Uint8Array(value).buffer; | ||
| return Promise.resolve({ value: buffer, done: false, }); | ||
| }); | ||
| }); | ||
| } | ||
|
|
||
| cancel(reason) { | ||
| if (this._reader) { | ||
| this._reader.cancel(reason); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| export { | ||
| PDFFetchStream, | ||
| }; |
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