pdfjs-dist/lib/test/unit/node_stream_spec.js

/**
 * @licstart The following is the entire license notice for the
 * JavaScript code in this page
 *
 * Copyright 2022 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";

var _util = require("../../shared/util.js");

var _is_node = require("../../shared/is_node.js");

var _node_stream = require("../../display/node_stream.js");

if (!_is_node.isNodeJS) {
  throw new Error('The "node_stream" unit-tests can only be run in Node.js environments.');
}

const path = require("path");

const url = require("url");

const http = require("http");

const fs = require("fs");

describe("node_stream", function () {
  let server = null;
  let port = null;
  const pdf = url.parse(encodeURI("file://" + path.join(process.cwd(), "./test/pdfs/tracemonkey.pdf"))).href;
  const pdfLength = 1016315;
  beforeAll(function () {
    server = http.createServer((request, response) => {
      const filePath = process.cwd() + "/test/pdfs" + request.url;
      fs.lstat(filePath, (error, stat) => {
        if (error) {
          response.writeHead(404);
          response.end(`File ${request.url} not found!`);
          return;
        }

        if (!request.headers.range) {
          const contentLength = stat.size;
          const stream = fs.createReadStream(filePath);
          response.writeHead(200, {
            "Content-Type": "application/pdf",
            "Content-Length": contentLength,
            "Accept-Ranges": "bytes"
          });
          stream.pipe(response);
        } else {
          const [start, end] = request.headers.range.split("=")[1].split("-").map(x => {
            return Number(x);
          });
          const stream = fs.createReadStream(filePath, {
            start,
            end
          });
          response.writeHead(206, {
            "Content-Type": "application/pdf"
          });
          stream.pipe(response);
        }
      });
    }).listen(0);
    port = server.address().port;
  });
  afterAll(function () {
    server.close();
  });
  it("read both http(s) and filesystem pdf files", async function () {
    const stream1 = new _node_stream.PDFNodeStream({
      url: `http://127.0.0.1:${port}/tracemonkey.pdf`,
      rangeChunkSize: 65536,
      disableStream: true,
      disableRange: true
    });
    const stream2 = new _node_stream.PDFNodeStream({
      url: pdf,
      rangeChunkSize: 65536,
      disableStream: true,
      disableRange: true
    });
    const fullReader1 = stream1.getFullReader();
    const fullReader2 = stream2.getFullReader();
    let isStreamingSupported1, isRangeSupported1;
    const promise1 = fullReader1.headersReady.then(() => {
      isStreamingSupported1 = fullReader1.isStreamingSupported;
      isRangeSupported1 = fullReader1.isRangeSupported;
    });
    let isStreamingSupported2, isRangeSupported2;
    const promise2 = fullReader2.headersReady.then(() => {
      isStreamingSupported2 = fullReader2.isStreamingSupported;
      isRangeSupported2 = fullReader2.isRangeSupported;
    });
    let len1 = 0,
        len2 = 0;

    const read1 = function () {
      return fullReader1.read().then(function (result) {
        if (result.done) {
          return undefined;
        }

        len1 += result.value.byteLength;
        return read1();
      });
    };

    const read2 = function () {
      return fullReader2.read().then(function (result) {
        if (result.done) {
          return undefined;
        }

        len2 += result.value.byteLength;
        return read2();
      });
    };

    await Promise.all([read1(), read2(), promise1, promise2]);
    expect(isStreamingSupported1).toEqual(false);
    expect(isRangeSupported1).toEqual(false);
    expect(isStreamingSupported2).toEqual(false);
    expect(isRangeSupported2).toEqual(false);
    expect(len1).toEqual(pdfLength);
    expect(len1).toEqual(len2);
  });
  it("read custom ranges for both http(s) and filesystem urls", async function () {
    const rangeSize = 32768;
    const stream1 = new _node_stream.PDFNodeStream({
      url: `http://127.0.0.1:${port}/tracemonkey.pdf`,
      length: pdfLength,
      rangeChunkSize: rangeSize,
      disableStream: true,
      disableRange: false
    });
    const stream2 = new _node_stream.PDFNodeStream({
      url: pdf,
      length: pdfLength,
      rangeChunkSize: rangeSize,
      disableStream: true,
      disableRange: false
    });
    const fullReader1 = stream1.getFullReader();
    const fullReader2 = stream2.getFullReader();
    let isStreamingSupported1, isRangeSupported1, fullReaderCancelled1;
    let isStreamingSupported2, isRangeSupported2, fullReaderCancelled2;
    const promise1 = fullReader1.headersReady.then(function () {
      isStreamingSupported1 = fullReader1.isStreamingSupported;
      isRangeSupported1 = fullReader1.isRangeSupported;
      fullReader1.cancel(new _util.AbortException("Don't need fullReader1."));
      fullReaderCancelled1 = true;
    });
    const promise2 = fullReader2.headersReady.then(function () {
      isStreamingSupported2 = fullReader2.isStreamingSupported;
      isRangeSupported2 = fullReader2.isRangeSupported;
      fullReader2.cancel(new _util.AbortException("Don't need fullReader2."));
      fullReaderCancelled2 = true;
    });
    const tailSize = pdfLength % rangeSize || rangeSize;
    const range11Reader = stream1.getRangeReader(pdfLength - tailSize - rangeSize, pdfLength - tailSize);
    const range12Reader = stream1.getRangeReader(pdfLength - tailSize, pdfLength);
    const range21Reader = stream2.getRangeReader(pdfLength - tailSize - rangeSize, pdfLength - tailSize);
    const range22Reader = stream2.getRangeReader(pdfLength - tailSize, pdfLength);
    const result11 = {
      value: 0
    },
          result12 = {
      value: 0
    };
    const result21 = {
      value: 0
    },
          result22 = {
      value: 0
    };

    const read = function (reader, lenResult) {
      return reader.read().then(function (result) {
        if (result.done) {
          return undefined;
        }

        lenResult.value += result.value.byteLength;
        return read(reader, lenResult);
      });
    };

    await Promise.all([read(range11Reader, result11), read(range12Reader, result12), read(range21Reader, result21), read(range22Reader, result22), promise1, promise2]);
    expect(result11.value).toEqual(rangeSize);
    expect(result12.value).toEqual(tailSize);
    expect(result21.value).toEqual(rangeSize);
    expect(result22.value).toEqual(tailSize);
    expect(isStreamingSupported1).toEqual(false);
    expect(isRangeSupported1).toEqual(true);
    expect(fullReaderCancelled1).toEqual(true);
    expect(isStreamingSupported2).toEqual(false);
    expect(isRangeSupported2).toEqual(true);
    expect(fullReaderCancelled2).toEqual(true);
  });
});