Block renderer-initiated main frame navigations to data URLs

extensions/test/data/web_view/apitest/main.js

Index: extensions/test/data/web_view/apitest/main.js
diff --git a/extensions/test/data/web_view/apitest/main.js b/extensions/test/data/web_view/apitest/main.js
index b6c734f6c3bc6e5266b33e6f7fc69a0a84ed9165..2489bbf45c0c6d2df8c7f09c13c8a4c718ea48c0 100644
--- a/extensions/test/data/web_view/apitest/main.js
+++ b/extensions/test/data/web_view/apitest/main.js
@@ -19,6 +19,8 @@ embedder.setUp_ = function(config) {
   embedder.redirectGuestURLDest =
       embedder.baseGuestURL + '/guest_redirect.html';
   embedder.windowOpenGuestURL = embedder.baseGuestURL + '/guest.html';
+  embedder.windowOpenGuestDataURL =
+      embedder.baseGuestURL + '/guest_data_url.html';
   embedder.sameDocumentNavigationURL =
       embedder.baseGuestURL + '/guest_same_document_navigation.html';
 };
@@ -1133,6 +1135,48 @@ function testNavigationToExternalProtocol() {
   document.body.appendChild(webview);
 }
 
+// This test verifies that redirecting a webview to a data URL is blocked.
+function testRedirectToDataUrlBlocked() {
+  var webview = document.createElement('webview');
+  webview.addEventListener('consolemessage', function(e) {
+    window.console.log('consolemessage: ' + e.message);
+    if (e.message.startsWith(
+        'Not allowed to top-level navigate to resource:')) {
+      embedder.test.succeed();
+    }
+  });
+  webview.addEventListener('loadstop', function(e) {
+    if (webview.getAttribute('src').startsWith("data:"))
+      embedder.test.fail();
+  });
+  webview.setAttribute('src', embedder.windowOpenGuestDataURL);
+  document.body.appendChild(webview);
+}
+
+// This test verifies that redirecting a webview to a data URL is allowed if the
+// current URL is already a data URL.
+function testRedirectToDataUrlFromDataUrlAllowed() {
+  var webview = document.createElement('webview');
+  webview.addEventListener('loadstop', function(e) {
+    if (webview.getAttribute('src').startsWith("data:text/html")) {
+      webview.executeScript({
+        code: 'window.location.href = "data:text/plain, success";'
+      }, function(results) {});
+    } else if (webview.getAttribute('src').startsWith("data:text/plain")) {
+      embedder.test.succeed();
+    }
+  });
+  webview.addEventListener('consolemessage', function(e) {
+    window.console.log('consolemessage: ' + e.message);
+    if (e.message.startsWith(
+        'Not allowed to top-level navigate to resource:')) {
+      embedder.test.fail();
+    }
+  });
+  webview.setAttribute('src', 'data:text/html,navigate to another data url');
+  document.body.appendChild(webview);
+}
+
 // This test ensures if the guest isn't there and we resize the guest (from JS),
 // it remembers the size correctly.
 function testNavigateAfterResize() {
@@ -1229,6 +1273,12 @@ function testNavOnSrcAttributeChange() {
 }
 
 // This test verifies that new window attachment functions as expected.
+//
+// TODO(crbug.com/594215) Test that opening a new window with a data URL is
+// blocked. There is currently no way to test this, as the block message is
+// printed on the new window which never gets created, so the message is lost.
+// Also test that opening a new window with a data URL when the webview is
+// already on a data URL is allowed.
 function testNewWindow() {
   var webview = document.createElement('webview');
   webview.addEventListener('newwindow', function(e) {
@@ -1785,6 +1835,9 @@ embedder.test.testList = {
   'testLoadStartLoadRedirect': testLoadStartLoadRedirect,
   'testNavigateAfterResize': testNavigateAfterResize,
   'testNavigationToExternalProtocol': testNavigationToExternalProtocol,
+  'testRedirectToDataUrlBlocked': testRedirectToDataUrlBlocked,
+  'testRedirectToDataUrlFromDataUrlAllowed':
+      testRedirectToDataUrlFromDataUrlAllowed,
   'testNavOnConsecutiveSrcAttributeChanges':
       testNavOnConsecutiveSrcAttributeChanges,
   'testNavOnSrcAttributeChange': testNavOnSrcAttributeChange,