Add an iframe permissions= attribute for implementing permission delegation

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

+// 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 "core/html/HTMLIFrameElement.h"
+#include "wtf/HashMap.h"
+#include "wtf/text/StringBuilder.h"
+
+namespace blink {
+
+namespace {
+
+struct SupportedPermission {
+    const char* name;
+    WebPermissionType type;
+};
+
+const SupportedPermission kSupportedPermissions[] = {
+    { "geolocation", WebPermissionTypeGeolocation },
+    { "notifications", WebPermissionTypeNotifications },
+    { "midi", WebPermissionTypeMidiSysEx },
+};
+
+// Returns true if the name is valid and the type is stored in |result|.
+bool getPermissionType(const AtomicString& name, WebPermissionType* result)
+{
+    for (const SupportedPermission& permission : kSupportedPermissions) {
+        if (name == permission.name) {
+            if (result)
+                *result = permission.type;
+            return true;
+        }
+    }
+    return false;
+}
+
+} // namespace
+
+HTMLIFrameElementPermissions::HTMLIFrameElementPermissions(HTMLIFrameElement* element)
+    : DOMTokenList(this)
+    , m_element(element)
+{
+}
+
+HTMLIFrameElementPermissions::~HTMLIFrameElementPermissions()
+{
+}
+
+DEFINE_TRACE(HTMLIFrameElementPermissions)
+{
+    visitor->trace(m_element);
+    DOMTokenList::trace(visitor);
+    DOMTokenListObserver::trace(visitor);
+}
+
+Vector<WebPermissionType> HTMLIFrameElementPermissions::parseDelegatedPermissions(String& invalidTokensErrorMessage) const
+{
+    Vector<WebPermissionType> permissions;
+    unsigned numTokenErrors = 0;
+    StringBuilder tokenErrors;
+    const SpaceSplitString& tokens = this->tokens();
+
+    for (size_t i = 0; i < tokens.size(); ++i) {
+        WebPermissionType type;
+        if (getPermissionType(tokens[i], &type)) {
+            permissions.append(type);
+        } else {
+            if (numTokenErrors)
+                tokenErrors.append(", '");
+            else
+                tokenErrors.append('\'');
+            tokenErrors.append(tokens[i]);
+            tokenErrors.append('\'');
+            ++numTokenErrors;
+        }
+    }
+
+    if (numTokenErrors) {
+        if (numTokenErrors > 1)
+            tokenErrors.append(" are invalid permissions flags.");
+        else
+            tokenErrors.append(" is an invalid permissions flag.");
+        invalidTokensErrorMessage = tokenErrors.toString();
+    }
+
+    return permissions;
+}
+
+bool HTMLIFrameElementPermissions::validateTokenValue(const AtomicString& tokenValue, ExceptionState&) const
+{
+    WebPermissionType unused;
+    return getPermissionType(tokenValue, &unused);
+}
+
+void HTMLIFrameElementPermissions::valueWasSet()
+{
+    if (m_element)
+        m_element->permissionsValueWasSet();
+}
+
+} // namespace blink