Implement ContentSecurityPolicy on the browser-side.

content/common/content_security_policy/csp_source.h

+// 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.
+
+#ifndef CONTENT_COMMON_CONTENT_SECURITY_POLICY_CSP_SOURCE_H_
+#define CONTENT_COMMON_CONTENT_SECURITY_POLICY_CSP_SOURCE_H_
+
+#include <string>
+
+#include "content/common/content_export.h"
+#include "url/gurl.h"
+
+namespace content {
+
+class CSPContext;
+
+// A CSPSource represents an expression that matches a set of urls.

[Mike West, 2017/02/15 16:18:18]

Perhaps:

"""
CSPSource represents a single Content Security Policy source expression, which
can be evaluated against a GURL to determine whether or not a given request
should be allowed.

https://w3c.github.io/webappsec-csp/#source-expression
"""

[arthursonzogni, 2017/02/16 13:30:25]

Perfect.

+// Examples of CSPSource:
+// - domain.example.com
+// - *.example.com
+// - https://cdn.com
+// - data:
+// - 'none'
+// - 'self'
+// - *
+struct CONTENT_EXPORT CSPSource {
+  CSPSource();
+  CSPSource(const std::string& scheme,
+            const std::string& host,
+            bool is_host_wildcard,
+            int port,
+            bool is_port_wildcard,
+            const std::string& path);
+  CSPSource(const CSPSource& source);
+  ~CSPSource();
+
+  // Scheme.
+  std::string scheme;
+
+  // Host.
+  std::string host;
+  bool is_host_wildcard;
+
+  // port.
+  int port;
+  bool is_port_wildcard;
+
+  // Path.
+  std::string path;
+
+  bool Allow(CSPContext* context,

[Mike West, 2017/02/15 16:18:18]

Or perhaps this could move to `CSPContext` entirely?

[arthursonzogni, 2017/02/16 13:30:25]

Why do you think it should be moved to CSPContext?

+             const GURL& url,
+             bool is_redirect = false) const;
+
+  std::string ToString() const;
+
+ private:
+  bool IsSchemeOnly() const;
+  bool HasPort() const;
+  bool HasHost() const;
+  bool HasPath() const;
+
+  bool AllowScheme(const GURL& url, CSPContext* context) const;
+  bool AllowHost(const GURL& url) const;
+  bool AllowPort(const GURL& url) const;
+  bool AllowPath(const GURL& url, bool is_redirect) const;
+};
+
+}  // namespace content
+#endif  // CONTENT_COMMON_CONTENT_SECURITY_POLICY_CSP_SOURCE_H_