Add an iframe permissions= attribute for implementing permission delegation

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

Index: third_party/WebKit/Source/core/html/HTMLIFrameElementPermissions.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLIFrameElementPermissions.cpp b/third_party/WebKit/Source/core/html/HTMLIFrameElementPermissions.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6d901789a1e794d8bf54b29d342f3bce9b3dc4c6
--- /dev/null
+++ b/third_party/WebKit/Source/core/html/HTMLIFrameElementPermissions.cpp
@@ -0,0 +1,73 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSDstyle license that can be
+// found in the LICENSE file.
+
+#include "core/html/HTMLIFrameElementPermissions.h"
+
+#include "wtf/HashMap.h"
+#include "wtf/text/StringBuilder.h"
+
+namespace blink {
+
+HTMLIFrameElementPermissions::HTMLIFrameElementPermissions(DOMTokenListObserver* observer)
+    : DOMTokenList(observer)
+{
+}
+
+HTMLIFrameElementPermissions::~HTMLIFrameElementPermissions()
+{
+}
+
+using SandboxSupportedTokens = HashMap<AtomicString, WebPermissionType>;
+
+static SandboxSupportedTokens& supportedTokens()
+{
+    DEFINE_STATIC_LOCAL(SandboxSupportedTokens, supportedValues, ());
+    if (supportedValues.isEmpty()) {
+        supportedValues.set("geolocation", WebPermissionTypeGeolocation);
+        supportedValues.set("notifications", WebPermissionTypeNotifications);
+        supportedValues.set("midi", WebPermissionTypeMidiSysEx);

[esprehn, 2016/06/01 05:05:57]

.add(...) not .set().

Also this is large in the binary size, we inline the hash function at the .add
and .set call sites. The sandbox code is also bad, we should probably use a loop
over an array of static strings.

[raymes, 2016/06/06 06:48:29]

Done.

+    }
+
+    return supportedValues;
+}
+
+Vector<WebPermissionType> HTMLIFrameElementPermissions::parseDelegatedPermissions(String& invalidTokensErrorMessage) const
+{
+    Vector<WebPermissionType> permissions;
+    size_t numTokenErrors = 0;

[esprehn, 2016/06/01 05:05:57]

unsigned

[raymes, 2016/06/06 06:48:29]

Done.

+    StringBuilder tokenErrors;
+    const SpaceSplitString& tokens = tokens();
+
+    for (size_t i = 0; i < tokens.size(); ++i) {
+        const auto& it = supportedTokens().find(tokens[i]);
+        if (it != supportedTokens().end()) {
+            permissions.append(it->value);
+        } else {
+            if (numTokenErrors > 0)

[esprehn, 2016/06/01 05:05:57]

if (numTokenErrors)

[raymes, 2016/06/06 06:48:29]

Done.

+                tokenErrors.appendLiteral(", '");

[esprehn, 2016/06/01 05:05:57]

appendLiteral is gone, just use append() now:

https://chromium.googlesource.com/chromium/src.git/+/41584c4ff6bc7a0556ffbbb3...

[raymes, 2016/06/06 06:48:29]

Done.

+            else
+                tokenErrors.append('\'');
+            tokenErrors.append(tokens[i]);
+            tokenErrors.append('\'');
+            ++numTokenErrors;
+        }
+    }
+
+    if (numTokenErrors > 0) {

[esprehn, 2016/06/01 05:05:57]

remove >

[raymes, 2016/06/06 06:48:29]

Done.

+        if (numTokenErrors > 1)
+            tokenErrors.appendLiteral(" are invalid permissions flags.");
+        else
+            tokenErrors.appendLiteral(" is an invalid permissions flag.");
+        invalidTokensErrorMessage = tokenErrors.toString();
+    }
+
+    return permissions;
+}
+
+bool HTMLIFrameElementPermissions::validateTokenValue(const AtomicString& tokenValue, ExceptionState&) const
+{
+    return supportedTokens().contains(tokenValue);
+}
+
+} // namespace blink