Initial stab at http authentication (basic + digest) in new http stack.

General design:
- class HttpAuth -- utility class for http-auth logic.
- class HttpAuth::ChallengeTokenizer -- parsing of www-Authenticate headers.
- class HttpAuthHandler -- base class for authentication schemes (inspired by nsIHttpAuthenticator)
- class HttpAuthHandlerBasic : HttpAuthHandler -- logic for basic auth.
- class HttpAuthHandlerDigest : HttpAuthHandler -- logic for digest auth.
- The auth integration in HttpNetworkTransaction mimics that of HttpTransactionWinHttp:
  + HttpNetworkTransaction::ApplyAuth() -- set the authorization headers.
  + HttpNetworkTransaction::PopulateAuthChallenge() -- process the challenges.

BUG=2346

Review URL: http://codereview.chromium.org/4063

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@2658 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 77 insertions, 0 deletions

diff --git a/net/http/http_auth_handler.h b/net/http/http_auth_handler.h
new file mode 100644
index 0000000..0608f7b
--- /dev/null
+++ b/net/http/http_auth_handler.h
@@ -0,0 +1,77 @@
+// Copyright (c) 2006-2008 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_AUTH_HANDLER_H_
+#define NET_HTTP_HTTP_AUTH_HANDLER_H_
+
+#include <string>
+
+#include "net/http/http_auth.h"
+
+namespace net {
+
+class HttpRequestInfo;
+class ProxyInfo;
+
+// HttpAuthHandler is the interface for the authentication schemes
+// (basic, digest, ...)
+// The registry mapping auth-schemes to implementations is hardcoded in 
+// HttpAuth::CreateAuthHandler().
+class HttpAuthHandler {
+ public:
+  // Initialize the handler by parsing a challenge string.
+  bool InitFromChallenge(std::string::const_iterator begin,
+                         std::string::const_iterator end,
+                         HttpAuth::Target target);
+
+  // Lowercase name of the auth scheme
+  virtual std::string scheme() const {
+    return scheme_;
+  }
+
+  // The realm value that was parsed during Init().
+  std::string realm() const {
+    return realm_;
+  }
+
+  // Numeric rank based on the challenge's security level. Higher
+  // numbers are better. Used by HttpAuth::ChooseBestChallenge().
+  int score() const {
+    return score_;
+  }
+
+  HttpAuth::Target target() const {
+    return target_;
+  }
+ 
+  // Generate the Authorization header value.
+  virtual std::string GenerateCredentials(const std::wstring& username,
+                                          const std::wstring& password,
+                                          const HttpRequestInfo* request,
+                                          const ProxyInfo* proxy) = 0;
+
+ protected:
+   // Initialize the handler by parsing a challenge string.
+   // Implementations are expcted to initialize the following members:
+   // score_, realm_, scheme_
+  virtual bool Init(std::string::const_iterator challenge_begin,
+                    std::string::const_iterator challenge_end) = 0;
+
+  // The lowercase auth-scheme {"basic", "digest", "ntlm", ...}
+  const char* scheme_;
+
+  // The realm.
+  std::string realm_;
+
+  // The score for this challenge. Higher numbers are better.
+  int score_;
+
+  // Whether this authentication request is for a proxy server, or an
+  // origin server.
+  HttpAuth::Target target_;
+};
+
+}  // namespace net
+
+#endif  // NET_HTTP_HTTP_AUTH_HANDLER_H_