Add Expect-CT header parsing

net/http/http_security_headers.h

 // Copyright (c) 2012 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 NET_HTTP_HTTP_SECURITY_HEADERS_H_
 #define NET_HTTP_HTTP_SECURITY_HEADERS_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/time/time.h"
 #include "base/values.h"
 #include "net/base/hash_value.h"
 #include "net/base/net_export.h"
 
 class GURL;
 
 namespace net {
 
 const uint32_t kMaxHSTSAgeSecs = 86400 * 365;  // 1 year
 
 // RFC7469 suggests that 60 days is a reasonable maximum max-age value
 // http://tools.ietf.org/html/rfc7469#section-4.1
 const uint32_t kMaxHPKPAgeSecs = 86400 * 60;  // 60 days
 
+// https://tools.ietf.org/html/draft-ietf-httpbis-expect-ct-00 suggests a
+// conservative maximum max-age, at least while Expect-CT is new.
+const uint32_t kMaxExpectCTAgeSecs = 86400 * 30;  // 30 days
+
 // Parses |value| as a Strict-Transport-Security header value. If successful,
 // returns true and sets |*max_age| and |*include_subdomains|.
 // Otherwise returns false and leaves the output parameters unchanged.
 //
 // value is the right-hand side of:
 //
 // "Strict-Transport-Security" ":"
 //     [ directive ]  *( ";" [ directive ] )
 bool NET_EXPORT_PRIVATE ParseHSTSHeader(const std::string& value,
                                         base::TimeDelta* max_age,
@@ skipping 35 matching lines @@
 // "Public-Key-Pins-Report-Only" ":"
 //     [ "max-age" "=" delta-seconds ";" ]
 //     "pin-" algo "=" base64 [ ";" ... ]
 //     [ ";" "includeSubdomains" ]
 //     [ ";" "report-uri" "=" uri-reference ]
 //
 bool NET_EXPORT_PRIVATE ParseHPKPReportOnlyHeader(const std::string& value,
                                                   bool* include_subdomains,
                                                   HashValueVector* hashes,
                                                   GURL* report_uri);
+
+// Parses |value| as an Expect-CT header value. If successful, returns true and
+// populates the |*max_age|, |*enforce|, and |*report_uri| values. Otherwise
+// returns false and leaves the output parameters unchanged.
+//
+// |value| is the right-hand side of:
+// "Expect-CT" ":"
+//     "max-age" "=" delta-seconds
+//     [ "," "enforce" ]
+//     [ "," "report-uri" "=" uri-reference ]
+//
+bool NET_EXPORT_PRIVATE ParseExpectCTHeader(const std::string& value,
+                                            base::TimeDelta* max_age,
+                                            bool* enforce,
+                                            GURL* report_uri);
+
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_SECURITY_HEADERS_H_