Adding Embedding-CSP HTTP header

third_party/WebKit/Source/core/html/HTMLIFrameElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann (hausmann@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Ericsson AB. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 103 matching lines @@
             SecurityPolicy::referrerPolicyFromStringWithLegacyKeywords(value, &m_referrerPolicy);
     } else if (name == allowfullscreenAttr) {
         bool oldAllowFullscreen = m_allowFullscreen;
         m_allowFullscreen = !value.isNull();
         if (m_allowFullscreen != oldAllowFullscreen)
             frameOwnerPropertiesChanged();
     } else if (name == permissionsAttr) {
         if (initializePermissionsAttribute())
             m_permissions->setValue(value);
     } else if (RuntimeEnabledFeatures::embedderCSPEnforcementEnabled() && name == cspAttr) {
+        for (size_t i = 0; i < value.length(); ++i) {

[Mike West, 2016/09/29 13:33:13]

You can replace this loop with `value.containsOnlyASCII()` (defined in
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/wtf/text/WTFSt...,
but you can cast an `AtomicString` to `WTF::String` without copying, so it's
fairly cheap).

+            if (!isASCII(value[i])) {
+                document().addConsoleMessage(ConsoleMessage::create(OtherMessageSource, ErrorMessageLevel, "'csp' attribute contains non-ASCII characters: " + value));
+                return;
+            }
+        }
         AtomicString oldCSP = m_csp;
         m_csp = value;
         if (m_csp != oldCSP)
             frameOwnerPropertiesChanged();
     } else {
         if (name == srcAttr)
             logUpdateAttributeIfIsolatedWorldAndInDocument("iframe", srcAttr, oldValue, value);
         HTMLFrameElementBase::parseAttribute(name, oldValue, value);
     }
 }
@@ skipping 60 matching lines @@
 {
     if (!RuntimeEnabledFeatures::permissionDelegationEnabled())
         return false;
 
     if (!m_permissions)
         m_permissions = HTMLIFrameElementPermissions::create(this);
     return true;
 }
 
 } // namespace blink