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test/unit/fetch_stream_spec.js

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+/* Copyright 2019 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 { AbortException } from "../../src/shared/util.js";
+import { PDFFetchStream } from "../../src/display/fetch_stream.js";
+import { testCrossOriginRedirects } from "./common_pdfstream_tests.js";
+import { TestPdfsServer } from "./test_utils.js";
+
+describe("fetch_stream", function () {
+  function getPdfUrl() {
+    return TestPdfsServer.resolveURL("tracemonkey.pdf").href;
+  }
+  const pdfLength = 1016315;
+
+  beforeAll(async function () {
+    await TestPdfsServer.ensureStarted();
+  });
+
+  afterAll(async function () {
+    await TestPdfsServer.ensureStopped();
+  });
+
+  it("read with streaming", async function () {
+    const stream = new PDFFetchStream({
+      url: getPdfUrl(),
+      disableStream: false,
+      disableRange: true,
+    });
+
+    const fullReader = stream.getFullReader();
+
+    let isStreamingSupported, isRangeSupported;
+    await fullReader.headersReady.then(function () {
+      isStreamingSupported = fullReader.isStreamingSupported;
+      isRangeSupported = fullReader.isRangeSupported;
+    });
+
+    let len = 0;
+    const read = function () {
+      return fullReader.read().then(function (result) {
+        if (result.done) {
+          return undefined;
+        }
+
+        len += result.value.byteLength;
+        return read();
+      });
+    };
+
+    await read();
+
+    expect(len).toEqual(pdfLength);
+    expect(isStreamingSupported).toEqual(true);
+    expect(isRangeSupported).toEqual(false);
+  });
+
+  it("read ranges with streaming", async function () {
+    const rangeSize = 32768;
+    const stream = new PDFFetchStream({
+      url: getPdfUrl(),
+      rangeChunkSize: rangeSize,
+      disableStream: false,
+      disableRange: false,
+    });
+
+    const fullReader = stream.getFullReader();
+
+    let isStreamingSupported, isRangeSupported, fullReaderCancelled;
+    await fullReader.headersReady.then(function () {
+      isStreamingSupported = fullReader.isStreamingSupported;
+      isRangeSupported = fullReader.isRangeSupported;
+      // We shall be able to close full reader without any issue.
+      fullReader.cancel(new AbortException("Don't need fullReader."));
+      fullReaderCancelled = true;
+    });
+
+    const tailSize = pdfLength % rangeSize || rangeSize;
+    const rangeReader1 = stream.getRangeReader(
+      pdfLength - tailSize - rangeSize,
+      pdfLength - tailSize
+    );
+    const rangeReader2 = stream.getRangeReader(pdfLength - tailSize, pdfLength);
+
+    const result1 = { value: 0 },
+      result2 = { 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(rangeReader1, result1),
+      read(rangeReader2, result2),
+    ]);
+
+    expect(isStreamingSupported).toEqual(true);
+    expect(isRangeSupported).toEqual(true);
+    expect(fullReaderCancelled).toEqual(true);
+    expect(result1.value).toEqual(rangeSize);
+    expect(result2.value).toEqual(tailSize);
+  });
+
+  describe("Redirects", function () {
+    it("redirects allowed if all responses are same-origin", async function () {
+      await testCrossOriginRedirects({
+        PDFStreamClass: PDFFetchStream,
+        redirectIfRange: false,
+        async testRangeReader(rangeReader) {
+          await expectAsync(rangeReader.read()).toBeResolved();
+        },
+      });
+    });
+
+    it("redirects blocked if any response is cross-origin", async function () {
+      await testCrossOriginRedirects({
+        PDFStreamClass: PDFFetchStream,
+        redirectIfRange: true,
+        async testRangeReader(rangeReader) {
+          // When read (sync), error should be reported.
+          await expectAsync(rangeReader.read()).toBeRejectedWithError(
+            /^Expected range response-origin "http:.*" to match "http:.*"\.$/
+          );
+          // When read again (async), error should be consistent.
+          await expectAsync(rangeReader.read()).toBeRejectedWithError(
+            /^Expected range response-origin "http:.*" to match "http:.*"\.$/
+          );
+        },
+      });
+    });
+  });
+});