Limit PDFFetchStream to http(s) in the Chrome extension

The `fetch` API is only supported for http(s), even in Chrome extensions.
Because of this limitation, we should use the XMLHttpRequest API when the
requested URL is not a http(s) URL.

Fixes mozilla#9361

src/display/api.js

@@ -83,15 +83,25 @@ if (typeof PDFJSDev !== 'undefined' &&
   }) : null;
 }
 
-/** @type IPDFStream */
-var PDFNetworkStream;
+/**
+ * @typedef {function} IPDFStreamFactory
+ * @param {DocumentInitParameters} params The document initialization
+ * parameters. The "url" key is always present.
+ * @return {IPDFStream}
+ */
+
+/** @type IPDFStreamFactory */
+var createPDFNetworkStream;
 
 /**
- * Sets PDFNetworkStream class to be used as alternative PDF data transport.
- * @param {IPDFStream} cls - the PDF data transport.
+ * Sets the function that instantiates a IPDFStream as an alternative PDF data
+ * transport.
+ * @param {IPDFStreamFactory} pdfNetworkStreamFactory - the factory function
+ * that takes document initialization parameters (including a "url") and returns
+ * an instance of IPDFStream.
  */
-function setPDFNetworkStreamClass(cls) {
-  PDFNetworkStream = cls;
+function setPDFNetworkStreamFactory(pdfNetworkStreamFactory) {
+  createPDFNetworkStream = pdfNetworkStreamFactory;
 }
 
 /**
@@ -252,7 +262,7 @@ function getDocument(src) {
       if (rangeTransport) {
         networkStream = new PDFDataTransportStream(params, rangeTransport);
       } else if (!params.data) {
-        networkStream = new PDFNetworkStream(params);
+        networkStream = createPDFNetworkStream(params);
       }
 
       var messageHandler = new MessageHandler(docId, workerId, worker.port);
@@ -2344,7 +2354,7 @@ export {
   PDFWorker,
   PDFDocumentProxy,
   PDFPageProxy,
-  setPDFNetworkStreamClass,
+  setPDFNetworkStreamFactory,
   version,
   build,
 };

src/pdf.js

@@ -30,19 +30,39 @@ var pdfjsDisplayDOMUtils = require('./display/dom_utils.js');
 var pdfjsDisplaySVG = require('./display/svg.js');
 
 if (typeof PDFJSDev === 'undefined' ||
-    !PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
+    !PDFJSDev.test('FIREFOX || MOZCENTRAL || CHROME')) {
   const isNodeJS = require('./shared/is_node.js');
   if (isNodeJS()) {
-    var PDFNodeStream = require('./display/node_stream.js').PDFNodeStream;
-    pdfjsDisplayAPI.setPDFNetworkStreamClass(PDFNodeStream);
+    let PDFNodeStream = require('./display/node_stream.js').PDFNodeStream;
+    pdfjsDisplayAPI.setPDFNetworkStreamFactory((params) => {
+      return new PDFNodeStream(params);
+    });
   } else if (typeof Response !== 'undefined' && 'body' in Response.prototype &&
              typeof ReadableStream !== 'undefined') {
-    var PDFFetchStream = require('./display/fetch_stream.js').PDFFetchStream;
-    pdfjsDisplayAPI.setPDFNetworkStreamClass(PDFFetchStream);
+    let PDFFetchStream = require('./display/fetch_stream.js').PDFFetchStream;
+    pdfjsDisplayAPI.setPDFNetworkStreamFactory((params) => {
+      return new PDFFetchStream(params);
+    });
    } else {
-    var PDFNetworkStream = require('./display/network.js').PDFNetworkStream;
-    pdfjsDisplayAPI.setPDFNetworkStreamClass(PDFNetworkStream);
+    let PDFNetworkStream = require('./display/network.js').PDFNetworkStream;
+    pdfjsDisplayAPI.setPDFNetworkStreamFactory((params) => {
+      return new PDFNetworkStream(params);
+    });
   }
+} else if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('CHROME')) {
+  let PDFNetworkStream = require('./display/network.js').PDFNetworkStream;
+  let PDFFetchStream;
+  if (typeof Response !== 'undefined' && 'body' in Response.prototype &&
+      typeof ReadableStream !== 'undefined') {
+    PDFFetchStream = require('./display/fetch_stream.js').PDFFetchStream;
+  }
+  pdfjsDisplayAPI.setPDFNetworkStreamFactory((params) => {
+    if (PDFFetchStream && /^https?:/i.test(params.url)) {
+      // "fetch" is only supported for http(s), not file/ftp.
+      return new PDFFetchStream(params);
+    }
+    return new PDFNetworkStream(params);
+  });
 }
 
 exports.PDFJS = pdfjsDisplayGlobal.PDFJS;

test/unit/jasmine-boot.js

@@ -85,9 +85,13 @@ function initializePDFJS(callback) {
     // Set network stream class for unit tests.
     if (typeof Response !== 'undefined' && 'body' in Response.prototype &&
         typeof ReadableStream !== 'undefined') {
-      displayApi.setPDFNetworkStreamClass(PDFFetchStream);
+      displayApi.setPDFNetworkStreamFactory(function(params) {
+        return new PDFFetchStream(params);
+      });
     } else {
-      displayApi.setPDFNetworkStreamClass(PDFNetworkStream);
+      displayApi.setPDFNetworkStreamFactory(function(params) {
+        return new PDFNetworkStream(params);
+      });
     }
 
     // Configure the worker.