Reject unadvertised encodings

net/http/http_util.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_UTIL_H_
 #define NET_HTTP_HTTP_UTIL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
+#include <set>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/time/time.h"
 #include "net/base/net_export.h"
 #include "net/http/http_byte_range.h"
@@ skipping 202 matching lines @@
 
   // Gets a vector of common HTTP status codes for histograms of status
   // codes.  Currently returns everything in the range [100, 600), plus 0
   // (for invalid responses/status codes).
   static std::vector<int> GetStatusCodesForHistogram();
 
   // Maps an HTTP status code to one of the status codes in the vector
   // returned by GetStatusCodesForHistogram.
   static int MapStatusCodeForHistogram(int code);
 
+  // Returns true if |accept_encoding| is well-formed.  Parsed encodings turned
+  // to lower case, are placed to provided string-set. Resulting set is
+  // augmented to fulfill the RFC 2616 and RFC 7231 recommendations, e.g. if
+  // there is no encodings specified, then {"*"} is returned to denote that
+  // client has to encoding preferences (but it does not imply that the
+  // user agent will be able to correctly process all encodings).
+  static bool ParseAcceptEncoding(const std::string& accept_encoding,
+                                  std::set<std::string>* allowed_encodings);
+
+  // Returns true if |content_encoding| is well-formed.  Parsed encodings turned
+  // to lower case, are placed to provided string-set. See sections 14.11 and
+  // 3.5 of RFC 2616.
+  static bool ParseContentEncoding(const std::string& content_encoding,
+                                   std::set<std::string>* used_encodings);
+
   // Used to iterate over the name/value pairs of HTTP headers.  To iterate
   // over the values in a multi-value header, use ValuesIterator.
   // See AssembleRawHeaders for joining line continuations (this iterator
   // does not expect any).
   class NET_EXPORT HeadersIterator {
    public:
     HeadersIterator(std::string::const_iterator headers_begin,
                     std::string::const_iterator headers_end,
                     const std::string& line_delimiter);
     ~HeadersIterator();
@@ skipping 182 matching lines @@
     // True if quotes values are required to be properly quoted; false if
     // mismatched quotes and other problems with quoted values should be more
     // or less gracefully treated as valid.
     bool strict_quotes_;
   };
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_UTIL_H_