Add GetPluginRefererURL to PPB_URLUtil_Dev interface to get the 'Referer' HTTP header value that wa…

content/renderer/pepper/pepper_plugin_instance_impl.cc

Index: content/renderer/pepper/pepper_plugin_instance_impl.cc
===================================================================
--- content/renderer/pepper/pepper_plugin_instance_impl.cc	(revision 219784)
+++ content/renderer/pepper/pepper_plugin_instance_impl.cc	(working copy)
@@ -93,6 +93,7 @@
 #include "third_party/WebKit/public/web/WebBindings.h"
 #include "third_party/WebKit/public/web/WebCompositionUnderline.h"
 #include "third_party/WebKit/public/web/WebCursorInfo.h"
+#include "third_party/WebKit/public/web/WebDataSource.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebElement.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
@@ -2498,6 +2499,24 @@
                                                       components);
 }
 
+PP_Var PepperPluginInstanceImpl::GetPluginReferrerURL(
+    PP_Instance instance,
+    PP_URLComponents_Dev* components) {
+  WebKit::WebDocument document = container()->element().document();
+  if (!full_frame_)
+    return ppapi::PPB_URLUtil_Shared::GenerateURLReturn(document.url(),

[Tom Sepez, 2013/08/29 20:07:56]

Does this leak info that would have otherwise been hidden, given that referrers
are suppressed for HTTPS to HTTP or HTTPS to HTTPS (different origin) requests?

[bbudge, 2013/09/06 20:35:45]

It's a Dev interface, so can't be used by apps from the web store. It's used
mostly for testing. We might need a note that this shouldn't ever be exposed to
real apps.

Also, it's not proxied to NaCl and likely won't ever be, since the
implementation pulls in suprising things, including ICU.

+                                                        components);
+  WebFrame* frame = document.frame();
+  if (!frame)
+    return PP_MakeUndefined();
+  const WebURLRequest& request = frame->dataSource()->originalRequest();
+  WebString referer = request.httpHeaderField("Referer");
+  if (referer.isEmpty())
+    return PP_MakeUndefined();
+  return ppapi::PPB_URLUtil_Shared::GenerateURLReturn(GURL(referer),
+                                                      components);
+}
+
 PP_ExternalPluginResult PepperPluginInstanceImpl::ResetAsProxied(
     scoped_refptr<PluginModule> module) {
   // Save the original module and switch over to the new one now that this