Merge pull request #6233 from Rob--W/crx-local-files

Improve support for viewing PDFs from file://-URLs in the Chrome extension

extensions/chromium/pdfHandler.js

@@ -226,3 +226,51 @@ chrome.webRequest.onBeforeRequest.addListener(
     types: ['main_frame', 'sub_frame']
   },
   ['blocking']);
+
+chrome.extension.isAllowedFileSchemeAccess(function(isAllowedAccess) {
+  if (isAllowedAccess) {
+    return;
+  }
+  // If the user has not granted access to file:-URLs, then the webRequest API
+  // will not catch the request. It is still visible through the webNavigation
+  // API though, and we can replace the tab with the viewer.
+  // The viewer will detect that it has no access to file:-URLs, and prompt the
+  // user to activate file permissions.
+  chrome.webNavigation.onBeforeNavigate.addListener(function(details) {
+    if (details.frameId === 0 && !isPdfDownloadable(details)) {
+      chrome.tabs.update(details.tabId, {
+        url: getViewerURL(details.url)
+      });
+    }
+  }, {
+    url: [{
+      urlPrefix: 'file://',
+      pathSuffix: '.pdf'
+    }, {
+      urlPrefix: 'file://',
+      pathSuffix: '.PDF'
+    }]
+  });
+});
+
+chrome.runtime.onMessage.addListener(function(message, sender, sendResponse) {
+  if (message && message.action === 'isAllowedFileSchemeAccess') {
+    chrome.extension.isAllowedFileSchemeAccess(sendResponse);
+    return true;
+  }
+  if (message && message.action === 'openExtensionsPageForFileAccess') {
+    var url = 'chrome://extensions/?id=' + chrome.runtime.id;
+    if (message.data.newTab) {
+      chrome.tabs.create({
+        windowId: sender.tab.windowId,
+        index: sender.tab.index + 1,
+        url: url,
+        openerTabId: sender.tab.id
+      });
+    } else {
+      chrome.tabs.update(sender.tab.id, {
+        url: url
+      });
+    }
+  }
+});