Bug 789856. Fire error events on <script> elements which completely fail to start the load. r=sicking

content/base/public/nsIScriptElement.h

@@ -17,8 +17,8 @@
 #include "mozilla/CORSMode.h"
 
 #define NS_ISCRIPTELEMENT_IID \
-{ 0x24ab3ff2, 0xd75e, 0x4be4, \
-  { 0x8d, 0x50, 0xd6, 0x75, 0x31, 0x29, 0xab, 0x65 } }
+{ 0x491628bc, 0xce7c, 0x4db4, \
+ { 0x93, 0x3f, 0xce, 0x1b, 0x75, 0xee, 0x75, 0xce } }
 
 /**
  * Internal interface implemented by script elements
@@ -235,6 +235,11 @@ public:
     return mozilla::CORS_NONE;
   }
 
+  /**
+   * Fire an error event
+   */
+  virtual nsresult FireErrorEvent() = 0;
+
 protected:
   /**
    * Processes the script if it's in the document-tree and links to or

content/base/src/nsScriptElement.cpp

@@ -25,19 +25,24 @@ nsScriptElement::ScriptAvailable(nsresult aResult,
                                  int32_t aLineNo)
 {
   if (!aIsInline && NS_FAILED(aResult)) {
-    nsCOMPtr<nsIContent> cont =
-      do_QueryInterface((nsIScriptElement*) this);
-
-    return nsContentUtils::DispatchTrustedEvent(cont->OwnerDoc(),
-                                                cont,
-                                                NS_LITERAL_STRING("error"),
-                                                false /* bubbles */,
-                                                false /* cancelable */);
+    return FireErrorEvent();
   }
-
   return NS_OK;
 }
 
+/* virtual */ nsresult
+nsScriptElement::FireErrorEvent()
+{
+  nsCOMPtr<nsIContent> cont =
+    do_QueryInterface((nsIScriptElement*) this);
+
+  return nsContentUtils::DispatchTrustedEvent(cont->OwnerDoc(),
+                                              cont,
+                                              NS_LITERAL_STRING("error"),
+                                              false /* bubbles */,
+                                              false /* cancelable */);
+}
+
 NS_IMETHODIMP
 nsScriptElement::ScriptEvaluated(nsresult aResult,
                                  nsIScriptElement *aElement,

content/base/src/nsScriptElement.h

@@ -31,6 +31,8 @@ public:
   {
   }
 
+  virtual nsresult FireErrorEvent();
+
 protected:
   // Internal methods
 

content/base/src/nsScriptLoader.cpp

@@ -482,6 +482,10 @@ nsScriptLoader::ProcessScriptElement(nsIScriptElement *aElement)
     // external script
     nsCOMPtr<nsIURI> scriptURI = aElement->GetScriptURI();
     if (!scriptURI) {
+      // Asynchronously report the failure to create a URI object
+      NS_DispatchToCurrentThread(
+        NS_NewRunnableMethod(aElement,
+                             &nsIScriptElement::FireErrorEvent));
       return false;
     }
     CORSMode ourCORSMode = aElement->GetCORSMode();
@@ -516,7 +520,13 @@ nsScriptLoader::ProcessScriptElement(nsIScriptElement *aElement)
       request->mIsInline = false;
       request->mLoading = true;
       rv = StartLoad(request, type);
-      NS_ENSURE_SUCCESS(rv, false);
+      if (NS_FAILED(rv)) {
+        // Asynchronously report the load failure
+        NS_DispatchToCurrentThread(
+          NS_NewRunnableMethod(aElement,
+                               &nsIScriptElement::FireErrorEvent));
+        return false;
+      }
     }
 
     request->mJSVersion = version;

content/base/test/Makefile.in

@@ -560,6 +560,7 @@ MOCHITEST_FILES_B = \
 		test_mixed_content_blocker.html \
 		file_mixed_content_main.html \
 		file_mixed_content_server.sjs \
+		test_bug789856.html \
 		$(NULL)
 
 MOCHITEST_CHROME_FILES =	\

content/base/test/test_bug606729.html

@@ -16,23 +16,35 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=606729
   
 </div>
 <pre id="test">
+<script>
+  SimpleTest.waitForExplicitFinish();
+  var events = 0;
+  var expectedEvents = 2;
+  function eventFired() {
+    ++events;
+    if (events == expectedEvents) {
+      SimpleTest.finish();
+    }
+  }
+</script>
 <script
   src="data:"
-  onerror="ok(false, 'Script with src=data: should not fire onerror.');"
-  onload="ok(false, 'Script with src=data: should not fire onload.');"
+  onerror="ok(true, 'Script with src=data: should fire onerror.');
+           eventFired();"
+  onload="ok(false, 'Script with src=data: should not fire onload.');
+          eventFired();"
 >
 ok(false, "Script with src=data: should not run textContent.");
 </script>
 <script
   src="bogus:"
-  onerror="ok(false, 'Script with src=bogus: should not fire onerror.');"
-  onload="ok(false, 'Script with src=bogus: should not fire onload.');"
+  onerror="ok(true, 'Script with src=bogus: should fire onerror.');
+           eventFired();"
+  onload="ok(false, 'Script with src=bogus: should not fire onload.');
+          eventFired();"
 >
 ok(false, "Script with src=bogus: should not run textContent.");
 </script>
-<script class="testbody" type="text/javascript">
-ok(true, "Obligatory succeeding test assertion.");
-</script>
 </pre>
 </body>
 </html>

content/base/test/test_bug789856.html

@@ -0,0 +1,42 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=789856
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 789856</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=789856">Mozilla Bug 789856</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 789856 **/
+SimpleTest.waitForExplicitFinish();
+
+var script = document.createElement("script");
+script.onload = function() {
+  ok(false, "This script should not load");
+  SimpleTest.finish();
+}
+script.onerror = function() {
+  ok(true, "This script should fail to load");
+  SimpleTest.finish();
+}
+// If neither one fires,  the test fails, as it should
+
+// Use a URL the test is not allowed to load
+script.src = "file:///tmp/"
+document.body.appendChild(script);
+
+</script>
+</pre>
+</body>
+</html>

content/html/content/test/test_bug371375.html

@@ -39,7 +39,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=371375
   SimpleTest.waitForExplicitFinish();
   addLoadEvent(function() {
     is(load1Called, false, "Load handler should not be called");
-    is(error1Called, false, "Error handler should not be called");
+    is(error1Called, true, "Error handler should be called");
     is(load2Called, true, "Load handler for valid script should be called");
     is(error2Called, false,
        "Error handler for valid script should not be called");