Implements loading PDF data by extension/chrome

extensions/firefox/components/PdfStreamConverter.js

@@ -14,6 +14,7 @@ const MOZ_CENTRAL = PDFJSSCRIPT_MOZ_CENTRAL;
 const PDFJS_EVENT_ID = 'pdf.js.message';
 const PDF_CONTENT_TYPE = 'application/pdf';
 const PREF_PREFIX = 'PDFJSSCRIPT_PREF_PREFIX';
+const PDF_VIEWER_WEB_PAGE = 'resource://pdf.js/web/viewer.html';
 const MAX_DATABASE_LENGTH = 4096;
 const FIREFOX_ID = '{ec8030f7-c20a-464f-9b0e-13a3a9e97384}';
 const SEAMONKEY_ID = '{92650c4d-4b8e-4d2a-b7eb-24ecf4f6b63a}';
@@ -122,9 +123,39 @@ function getLocalizedString(strings, id, property) {
   return id;
 }
 
+// PDF data storage
+function PdfDataListener(length) {
+  this.length = length;
+  this.data = new Uint8Array(length);
+}
+
+PdfDataListener.prototype = {
+  set: function PdfDataListener_set(chunk, offset) {
+    this.data.set(chunk, offset);
+    var loaded = offset + chunk.length;
+    this.onprogress(loaded, this.length);
+  },
+  finish: function PdfDataListener_finish() {
+    this.isDataReady = true;
+    if (this.oncompleteCallback) {
+      this.oncompleteCallback(this.data);
+      delete this.data;
+    }
+  },
+  onprogress: function() {},
+  set oncomplete(value) {
+    this.oncompleteCallback = value;
+    if (this.isDataReady) {
+      value(this.data);
+      delete this.data; // releasing temporary storage
+    }
+  }
+};
+
 // All the priviledged actions.
-function ChromeActions(domWindow) {
+function ChromeActions(domWindow, dataListener) {
   this.domWindow = domWindow;
+  this.dataListener = dataListener;
 }
 
 ChromeActions.prototype = {
@@ -194,6 +225,36 @@ ChromeActions.prototype = {
   getLocale: function() {
     return getStringPref('general.useragent.locale', 'en-US');
   },
+  getLoadingType: function() {
+    return this.dataListener ? 'passive' : 'active';
+  },
+  initPassiveLoading: function() {
+    if (!this.dataListener)
+      return false;
+
+    var domWindow = this.domWindow;
+    this.dataListener.onprogress =
+      function ChromeActions_dataListenerProgress(loaded, total) {
+      domWindow.postMessage({
+        pdfjsLoadAction: 'progress',
+        loaded: loaded,
+        total: total
+      }, '*');
+    };
+
+    this.dataListener.oncomplete =
+      function ChromeActions_dataListenerComplete(data) {
+
+      domWindow.postMessage({
+        pdfjsLoadAction: 'complete',
+        data: data
+      }, '*');
+
+      delete this.dataListener;
+    };
+
+    return true;
+  },
   getStrings: function(data) {
     try {
       // Lazy initialization of localizedStrings
@@ -324,17 +385,21 @@ PdfStreamConverter.prototype = {
   asyncConvertData: function(aFromType, aToType, aListener, aCtxt) {
     if (!isEnabled())
       throw Cr.NS_ERROR_NOT_IMPLEMENTED;
-    // Ignoring HTTP POST requests -- pdf.js has to repeat the request.
-    var skipConversion = false;
-    try {
-      var request = aCtxt;
-      request.QueryInterface(Ci.nsIHttpChannel);
-      skipConversion = (request.requestMethod !== 'GET');
-    } catch (e) {
-      // Non-HTTP request... continue normally.
+
+    var useFetchByChrome = getBoolPref(PREF_PREFIX + '.fetchByChrome', true);
+    if (!useFetchByChrome) {
+      // Ignoring HTTP POST requests -- pdf.js has to repeat the request.
+      var skipConversion = false;
+      try {
+        var request = aCtxt;
+        request.QueryInterface(Ci.nsIHttpChannel);
+        skipConversion = (request.requestMethod !== 'GET');
+      } catch (e) {
+        // Non-HTTP request... continue normally.
+      }
+      if (skipConversion)
+        throw Cr.NS_ERROR_NOT_IMPLEMENTED;
     }
-    if (skipConversion)
-      throw Cr.NS_ERROR_NOT_IMPLEMENTED;
 
     // Store the listener passed to us
     this.listener = aListener;
@@ -342,8 +407,14 @@ PdfStreamConverter.prototype = {
 
   // nsIStreamListener::onDataAvailable
   onDataAvailable: function(aRequest, aContext, aInputStream, aOffset, aCount) {
-    // Do nothing since all the data loading is handled by the viewer.
-    log('SANITY CHECK: onDataAvailable SHOULD NOT BE CALLED!');
+    if (!this.dataListener) {
+      // Do nothing since all the data loading is handled by the viewer.
+      return;
+    }
+
+    var binaryStream = this.binaryStream;
+    binaryStream.setInputStream(aInputStream);
+    this.dataListener.set(binaryStream.readByteArray(aCount), aOffset);
   },
 
   // nsIRequestObserver::onStartRequest
@@ -351,15 +422,30 @@ PdfStreamConverter.prototype = {
 
     // Setup the request so we can use it below.
     aRequest.QueryInterface(Ci.nsIChannel);
-    // Cancel the request so the viewer can handle it.
-    aRequest.cancel(Cr.NS_BINDING_ABORTED);
+    var useFetchByChrome = getBoolPref(PREF_PREFIX + '.fetchByChrome', true);
+    var dataListener;
+    if (useFetchByChrome) {
+      // Creating storage for PDF data
+      var contentLength = aRequest.contentLength;
+      if (contentLength < 0)
+        throw new 'Unknown length is not supported';
+
+      dataListener = new PdfDataListener(contentLength);
+      this.dataListener = dataListener;
+      this.binaryStream = Cc['@mozilla.org/binaryinputstream;1']
+                          .createInstance(Ci.nsIBinaryInputStream);
+    } else {
+      // Cancel the request so the viewer can handle it.
+      aRequest.cancel(Cr.NS_BINDING_ABORTED);
+    }
 
     // Create a new channel that is viewer loaded as a resource.
     var ioService = Services.io;
     var channel = ioService.newChannel(
-                    'resource://pdf.js/web/viewer.html', null, null);
+                    PDF_VIEWER_WEB_PAGE, null, null);
 
     var listener = this.listener;
+    var self = this;
     // Proxy all the request observer calls, when it gets to onStopRequest
     // we can get the dom window.
     var proxy = {
@@ -373,8 +459,8 @@ PdfStreamConverter.prototype = {
         var domWindow = getDOMWindow(channel);
         // Double check the url is still the correct one.
         if (domWindow.document.documentURIObject.equals(aRequest.URI)) {
-          let requestListener = new RequestListener(
-                                      new ChromeActions(domWindow));
+          let actions = new ChromeActions(domWindow, dataListener);
+          let requestListener = new RequestListener(actions);
           domWindow.addEventListener(PDFJS_EVENT_ID, function(event) {
             requestListener.receive(event);
           }, false, true);
@@ -386,11 +472,27 @@ PdfStreamConverter.prototype = {
     // Keep the URL the same so the browser sees it as the same.
     channel.originalURI = aRequest.URI;
     channel.asyncOpen(proxy, aContext);
+    if (useFetchByChrome) {
+      // We can use resource principal when data is fetched by the chrome
+      // e.g. useful for NoScript
+      var securityManager = Cc['@mozilla.org/scriptsecuritymanager;1']
+                            .getService(Ci.nsIScriptSecurityManager);
+      var uri = ioService.newURI(PDF_VIEWER_WEB_PAGE, null, null);
+      var resourcePrincipal = securityManager.getCodebasePrincipal(uri);
+      channel.owner = resourcePrincipal;
+    }
   },
 
   // nsIRequestObserver::onStopRequest
   onStopRequest: function(aRequest, aContext, aStatusCode) {
-    // Do nothing.
+    if (!this.dataListener) {
+      // Do nothing
+      return;
+    }
+
+    this.dataListener.finish();
+    delete this.dataListener;
+    delete this.binaryStream;
   }
 };
 

web/viewer.js

@@ -390,11 +390,37 @@ var PDFView = {
     return value;
   },
 
+  initPassiveLoading: function pdfViewInitPassiveLoading() {
+    if (!PDFView.loadingBar) {
+      PDFView.loadingBar = new ProgressBar('#loadingBar', {});
+    }
+
+    window.addEventListener('message', function window_message(e) {
+      var args = e.data;
+
+      if (!('pdfjsLoadAction' in args))
+        return;
+      switch (args.pdfjsLoadAction) {
+        case 'progress':
+          PDFView.progress(args.loaded / args.total);
+          break;
+        case 'complete':
+          PDFView.open(args.data, 0);
+          break;
+      }
+    });
+    FirefoxCom.requestSync('initPassiveLoading', null);
+  },
+
+  setTitleUsingUrl: function pdfViewSetTitleUsingUrl(url) {
+    this.url = url;
+    document.title = decodeURIComponent(getFileName(url)) || url;
+  },
+
   open: function pdfViewOpen(url, scale, password) {
     var parameters = {password: password};
     if (typeof url === 'string') { // URL
-      this.url = url;
-      document.title = decodeURIComponent(getFileName(url)) || url;
+      this.setTitleUsingUrl(url);
       parameters.url = url;
     } else if (url && 'byteLength' in url) { // ArrayBuffer
       parameters.data = url;
@@ -1736,7 +1762,7 @@ var TextLayerBuilder = function textLayerBuilder(textLayerDiv) {
   };
 };
 
-window.addEventListener('load', function webViewerLoad(evt) {
+document.addEventListener('DOMContentLoaded', function webViewerLoad(evt) {
   PDFView.initialize();
   var params = PDFView.parseQueryString(document.location.search.substring(1));
 
@@ -1813,7 +1839,12 @@ window.addEventListener('load', function webViewerLoad(evt) {
       PDFView.renderHighestPriority();
     });
 
-  PDFView.open(file, 0);
+  if (PDFJS.isFirefoxExtension &&
+      FirefoxCom.requestSync('getLoadingType') == 'passive') {
+    PDFView.setTitleUsingUrl(file);
+    PDFView.initPassiveLoading();
+  } else
+    PDFView.open(file, 0);
 }, true);
 
 function updateViewarea() {
@@ -1887,7 +1918,7 @@ window.addEventListener('change', function webViewerChange(evt) {
   // implemented in Firefox.
   var file = files[0];
   fileReader.readAsBinaryString(file);
-  document.title = file.name;
+  PDFView.setTitleUsingUrl(file.name);
 
   // URL does not reflect proper document location - hiding some icons.
   document.getElementById('viewBookmark').setAttribute('hidden', 'true');