Adds the OAuthRequestSigner class to facilitate OAuth integration

chrome/common/net/gaia/oauth_request_signer.h

Index: chrome/common/net/gaia/oauth_request_signer.h
diff --git a/chrome/common/net/gaia/oauth_request_signer.h b/chrome/common/net/gaia/oauth_request_signer.h
new file mode 100644
index 0000000000000000000000000000000000000000..ecc386b0c4f2cd722688acbc18540d587e077453
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+++ b/chrome/common/net/gaia/oauth_request_signer.h
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+// Copyright (c) 2011 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 CHROME_COMMON_NET_GAIA_OAUTH_REQUEST_SIGNER_H_
+#define CHROME_COMMON_NET_GAIA_OAUTH_REQUEST_SIGNER_H_
+#pragma once
+
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+
+class GURL;
+
+// Implements the OAuth request signing process as described here:
+//   http://oauth.net/core/1.0/#signing_process
+//
+// NOTE: Currently the only supported SignatureMethod is HMAC_SHA1_SIGNATURE
+class OAuthRequestSigner {
+ public:
+  enum SignatureMethod {
+    HMAC_SHA1_SIGNATURE,
+    RSA_SHA1_SIGNATURE,
+    PLAINTEXT_SIGNATURE
+  };
+
+  enum HttpMethod {
+    GET_METHOD,
+    POST_METHOD
+  };
+
+  typedef std::map<std::string,std::string> Parameters;
+
+  // Signs a request specified as URL string, complete with parameters.
+  //
+  // If HttpMethod is GET_METHOD, the signed result is the full URL, otherwise
+  // it is the request parameters, including the oauth_signature field.
+  static bool ParseAndSign(const GURL& request_url_with_parameters,
+                           SignatureMethod signature_method,
+                           HttpMethod http_method,
+                           const std::string& consumer_key,
+                           const std::string& consumer_secret,
+                           const std::string& token_key,
+                           const std::string& token_secret,
+                           std::string* signed_result);
+
+  // Signs a request specified as the combination of a base URL string, with
+  // parameters included in a separate map data structure.  NOTE: The base URL
+  // string must not contain a question mark (?) character.  If it does,
+  // you can use ParseAndSign() instead.
+  //
+  // If HttpMethod is GET_METHOD, the signed result is the full URL, otherwise
+  // it is the request parameters, including the oauth_signature field.
+  static bool Sign(const GURL& request_base_url,
+                   const Parameters& parameters,
+                   SignatureMethod signature_method,
+                   HttpMethod http_method,
+                   const std::string& consumer_key,
+                   const std::string& consumer_secret,
+                   const std::string& token_key,
+                   const std::string& token_secret,
+                   std::string* signed_result);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(OAuthRequestSigner);
+};
+
+#endif  // CHROME_COMMON_NET_GAIA_OAUTH_REQUEST_SIGNER_H_