Implement ContentSecurityPolicy on the browser-side.

content/common/content_security_policy/csp_directive.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <sstream>
+
+#include "content/common/content_security_policy/csp_directive.h"
+
+namespace content {
+
+CSPDirective::CSPDirective() = default;
+CSPDirective::CSPDirective(Name name, const CSPSourceList& source_list)
+    : name(name), source_list(source_list) {}
+CSPDirective::CSPDirective(const CSPDirective&) = default;
+
+std::string CSPDirective::ToString() const {
+  return NameToString(name) + " " + source_list.ToString();
+}
+
+// static
+std::string CSPDirective::NameToString(CSPDirective::Name name) {
+  switch (name) {
+    case DefaultSrc:
+      return "default-src";
+    case FrameAncestors:
+      return "frame-ancestors";
+    case ChildSrc:
+      return "child-src";
+    case FrameSrc:
+      return "frame-src";
+    case FormAction:
+      return "form-action";
+    case ReportURI:
+      return "report-uri";
+    case Unknown:
+      return "";
+  }
+}
+
+// static
+CSPDirective::Name CSPDirective::StringToName(const std::string& name) {
+  if (name == "default-src")
+    return CSPDirective::DefaultSrc;
+  if (name == "frame-ancestors")
+    return CSPDirective::FrameAncestors;
+  if (name == "child-src")
+    return CSPDirective::ChildSrc;
+  if (name == "frame-src")
+    return CSPDirective::FrameSrc;
+  if (name == "form-action")
+    return CSPDirective::FormAction;
+  if (name == "report-uri")
+    return CSPDirective::ReportURI;
+  return CSPDirective::Unknown;
+}
+
+}  // namespace content