Add net to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@14 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 109 insertions, 0 deletions

diff --git a/net/http/http_vary_data.h b/net/http/http_vary_data.h
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+++ b/net/http/http_vary_data.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef NET_HTTP_HTTP_VARY_DATA_H__
+#define NET_HTTP_HTTP_VARY_DATA_H__
+
+#include "base/md5.h"
+#include "base/ref_counted.h"
+
+class Pickle;
+
+namespace net {
+
+class HttpRequestInfo;
+class HttpResponseHeaders;
+
+// Used to implement the HTTP/1.1 Vary header.  This class contains a MD5 hash
+// over the request headers indicated by a Vary header.
+//
+// While RFC 2616 requires strict request header comparisons, it is much
+// cheaper to store a MD5 sum, which should be sufficient.  Storing a hash also
+// avoids messy privacy issues as some of the request headers could hold
+// sensitive data (e.g., cookies).
+//
+// NOTE: This class does not hold onto the contents of the Vary header.
+// Instead, it relies on the consumer to store that and to supply it again to
+// the MatchesRequest function for comparing against future HTTP requests.
+//
+class HttpVaryData {
+ public:
+  HttpVaryData();
+
+  bool is_valid() const { return is_valid_; }
+
+  // Initialize from a request and its corresponding response headers.
+  //
+  // Returns true if a Vary header was found in the response headers and that
+  // Vary header was not empty and did not contain the '*' value.  Upon
+  // success, the object is also marked as valid such that is_valid() will
+  // return true.  Otherwise, false is returned to indicate that this object
+  // was not modified.
+  //
+  bool Init(const HttpRequestInfo& request_info,
+            const HttpResponseHeaders& response_headers);
+
+  // Initialize from a pickle that contains data generated by a call to the
+  // vary data's Persist method.
+  //
+  // Upon success, true is returned and the object is marked as valid such that
+  // is_valid() will return true.  Otherwise, false is returned to indicate
+  // that this object was not modified.
+  //
+  bool InitFromPickle(const Pickle& pickle, void** pickle_iter);
+
+  // Call this method to persist the vary data.
+  void Persist(Pickle* pickle) const;
+
+  // Call this method to test if the given request matches the previous request
+  // with which this vary data corresponds.  The |cached_response_headers| must
+  // be the same response headers used to generate this vary data.
+  bool MatchesRequest(const HttpRequestInfo& request_info,
+                      const HttpResponseHeaders& cached_response_headers) const;
+
+ private:
+  // Returns the corresponding request header value.
+  static std::string GetRequestValue(const HttpRequestInfo& request_info,
+                                     const std::string& request_header);
+
+  // Append to the MD5 context for the given request header.
+  static void AddField(const HttpRequestInfo& request_info,
+                       const std::string& request_header,
+                       MD5Context* context);
+
+  // A digested version of the request headers corresponding to the Vary header.
+  MD5Digest request_digest_;
+
+  // True when request_digest_ contains meaningful data.
+  bool is_valid_;
+};
+
+}  // namespace net
+
+#endif  // NET_HTTP_HTTP_VARY_DATA_H__