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All rights reserved.\n// Licensed to the Readium Foundation under one or more contributor license agreements.\n// Use of this source code is governed by a BSD-style license\n// that can be found in the LICENSE file exposed on Github (readium) in the project repository.\n// ==LICENSE-END==\n\nimport * as debug_ from \"debug\";\nimport * as request from \"request\";\nimport * as requestPromise from \"request-promise-native\";\nimport { PassThrough } from \"stream\";\nimport * as yauzl from \"yauzl\";\n\nimport { bufferToStream, streamToBufferPromise } from \"../stream/BufferUtils\";\n\n// import { HttpReadableStream } from \"./HttpReadableStream\";\n\nconst debug = debug_(\"r2:utils#zip/zip2RandomAccessReader_Http\");\n\n// import * as util from \"util\";\n// export interface RandomAccessReader {\n// _readStreamForRange(start: number, end: number): void;\n// }\n\n// YAUZL:\n// export abstract class RandomAccessReader extends EventEmitter {\n// _readStreamForRange(start: number, end: number): void;\n// createReadStream(options: { start: number; end: number }): void;\n// read(buffer: Buffer, offset: number, length: number, position: number, callback: (err?: Error) => void): void;\n// close(callback: (err?: Error) => void): void;\n// }\n\nexport class HttpZipReader extends yauzl.RandomAccessReader {\n\n private firstBuffer: Buffer | undefined = undefined;\n private firstBufferStart = 0;\n private firstBufferEnd = 0;\n\n constructor(readonly url: string, readonly byteLength: number) {\n super();\n // yauzl.RandomAccessReader.call(this);\n }\n\n public _readStreamForRange(start: number, end: number) {\n // const length = end - start;\n // debug(`_readStreamForRange (new HttpReadableStream) ${this.url}` +\n // ` content-length=${this.byteLength} start=${start} end+1=${end} (length=${length})`);\n\n // return new HttpReadableStream(this.url, this.byteLength, start, end);\n // =>\n\n // const length = end - start;\n // debug(`_read: ${size} (${this.url}` +\n // ` content-length=${this.byteLength} start=${this.start} end+1=${this.end} (length=${length}))`);\n // debug(`alreadyRead: ${this.alreadyRead} (byteLength: ${length})`);\n\n if (this.firstBuffer && start >= this.firstBufferStart && end <= this.firstBufferEnd) {\n\n // debug(`HTTP CACHE ${this.url}: ${start}-${end} (${length}) [${this.byteLength}]`);\n\n const begin = start - this.firstBufferStart;\n const stop = end - this.firstBufferStart;\n\n return bufferToStream(this.firstBuffer.slice(begin, stop));\n }\n\n const stream = new PassThrough();\n\n const lastByteIndex = end - 1;\n const range = `${start}-${lastByteIndex}`;\n\n // debug(`HTTP GET ${this.url}: ${start}-${end} (${length}) [${this.byteLength}]`);\n\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n const failure = (err: any) => {\n debug(err);\n // this.stream.end();\n };\n\n const success = async (res: request.RequestResponse) => {\n if (res.statusCode && (res.statusCode < 200 || res.statusCode >= 300)) {\n failure(\"HTTP CODE \" + res.statusCode);\n return;\n }\n\n // debug(res);\n\n // debug(res.headers);\n // debug(res.headers[\"content-type\"]);\n // debug(`HTTP response content-range: ${res.headers[\"content-range\"]}`);\n // debug(`HTTP response content-length: ${res.headers[\"content-length\"]}`);\n\n if (this.firstBuffer) {\n res.pipe(stream);\n // // .on(\"end\", () => {\n // // debug(\"END\");\n // // });\n } else {\n let buffer: Buffer;\n try {\n buffer = await streamToBufferPromise(res);\n } catch (err) {\n debug(err);\n stream.end();\n return;\n }\n debug(`streamToBufferPromise: ${buffer.length}`);\n\n this.firstBuffer = buffer;\n this.firstBufferStart = start;\n this.firstBufferEnd = end;\n\n stream.write(buffer);\n stream.end();\n }\n };\n\n // No response streaming! :(\n // https://github.com/request/request-promise/issues/90\n const needsStreamingResponse = true;\n if (needsStreamingResponse) {\n request.get({\n headers: { Range: `bytes=${range}` },\n method: \"GET\",\n uri: this.url,\n })\n .on(\"response\", async (res) => {\n try {\n await success(res);\n }\n catch (successError) {\n failure(successError);\n return;\n }\n })\n .on(\"error\", failure);\n } else {\n // tslint:disable-next-line:no-floating-promises\n (async () => {\n let res: requestPromise.FullResponse;\n try {\n // tslint:disable-next-line:await-promise no-floating-promises\n res = await requestPromise({\n headers: { Range: `bytes=${range}` },\n method: \"GET\",\n resolveWithFullResponse: true,\n uri: this.url,\n });\n } catch (err) {\n failure(err);\n return;\n }\n\n await success(res);\n })()\n // .then(() => {\n // debug(\"done\");\n // }).catch((err) => {\n // debug(err);\n // })\n ;\n }\n\n return stream;\n }\n}\n// util.inherits(HttpZipReader, yauzl.RandomAccessReader);\n\n// // tslint:disable-next-line:space-before-function-paren\n// HttpZipReader.prototype._readStreamForRange = function (start: number, end: number) {\n\n// };\n"]} |