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, 46 insertions, 0 deletions

diff --git a/net/http/http_auth_handler_basic.cc b/net/http/http_auth_handler_basic.cc
new file mode 100644
index 0000000..51c165c
--- /dev/null
+++ b/net/http/http_auth_handler_basic.cc
@@ -0,0 +1,46 @@
+// 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.
+
+#include "net/http/http_auth_handler_basic.h"
+
+#include "base/string_util.h"
+#include "net/http/http_auth.h"
+#include "net/base/base64.h"
+
+namespace net {
+
+bool HttpAuthHandlerBasic::Init(std::string::const_iterator challenge_begin,
+                                std::string::const_iterator challenge_end) {
+  scheme_ = "basic";
+  score_ = 1;
+
+  // Verify the challenge's auth-scheme.
+  HttpAuth::ChallengeTokenizer challenge_tok(challenge_begin, challenge_end);
+  if (!challenge_tok.valid() ||
+      !LowerCaseEqualsASCII(challenge_tok.scheme(), "basic"))
+    return false;
+
+  // Extract the realm.
+  while (challenge_tok.GetNext()) {
+    if (LowerCaseEqualsASCII(challenge_tok.name(), "realm"))
+      realm_ = challenge_tok.unquoted_value();
+  }
+
+  return challenge_tok.valid() && !realm_.empty();
+}
+
+std::string HttpAuthHandlerBasic::GenerateCredentials(
+    const std::wstring& username,
+    const std::wstring& password,
+    const HttpRequestInfo*,
+    const ProxyInfo*) {
+  // TODO(eroman): is this the right encoding of username/password?
+  std::string base64_username_password;
+  if (!Base64Encode(WideToUTF8(username) + ":" + WideToUTF8(password),
+        &base64_username_password))
+    return std::string(); // FAIL
+  return std::string("Basic ") + base64_username_password;
+}
+
+}  // namespace net