This broke M20 build.

remoting/protocol/me2me_host_authenticator_factory.cc

 // 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.
 
 #include "remoting/protocol/me2me_host_authenticator_factory.h"
 
 #include "base/base64.h"
 #include "base/string_util.h"
 #include "crypto/rsa_private_key.h"
 #include "remoting/protocol/channel_authenticator.h"
@@ skipping 40 matching lines @@
     return scoped_ptr<ChannelAuthenticator>(NULL);
   }
 
  protected:
   State state_;
 };
 
 }  // namespace
 
 Me2MeHostAuthenticatorFactory::Me2MeHostAuthenticatorFactory(
+    const std::string& local_jid,
     const std::string& local_cert,
     const crypto::RSAPrivateKey& local_private_key,
     const SharedSecretHash& shared_secret_hash)
     : local_cert_(local_cert),
       local_private_key_(local_private_key.Copy()),
       shared_secret_hash_(shared_secret_hash) {
+  // Verify that |local_jid| is bare.
+  DCHECK_EQ(local_jid.find('/'), std::string::npos);
+  local_jid_prefix_ = local_jid + '/';
 }
 
 Me2MeHostAuthenticatorFactory::~Me2MeHostAuthenticatorFactory() {
 }
 
 scoped_ptr<Authenticator> Me2MeHostAuthenticatorFactory::CreateAuthenticator(
-    const std::string& local_jid,
     const std::string& remote_jid,
     const buzz::XmlElement* first_message) {
-
-  size_t slash_pos = local_jid.find('/');
-  if (slash_pos == std::string::npos) {
-    LOG(DFATAL) << "Invalid local JID:" << local_jid;
-    return scoped_ptr<Authenticator>(new RejectingAuthenticator());
-  }
-
   // Verify that the client's jid is an ASCII string, and then check
   // that the client has the same bare jid as the host, i.e. client's
   // full JID starts with host's bare jid. Comparison is case
   // insensitive.
   if (!IsStringASCII(remote_jid) ||
-      !StartsWithASCII(remote_jid, local_jid.substr(0, slash_pos + 1), false)) {
+      !StartsWithASCII(remote_jid, local_jid_prefix_, false)) {
     LOG(ERROR) << "Rejecting incoming connection from " << remote_jid;
     return scoped_ptr<Authenticator>(new RejectingAuthenticator());
   }
 
   if (shared_secret_hash_.hash_function == AuthenticationMethod::NONE &&
       shared_secret_hash_.value.empty()) {
     // PIN isn't set. Enable V1 authentication.
     if (!NegotiatingAuthenticator::IsNegotiableMessage(first_message)) {
       return scoped_ptr<Authenticator>(
           new V1HostAuthenticator(local_cert_, *local_private_key_,
                                   "", remote_jid));
     }
   }
 
   return NegotiatingAuthenticator::CreateForHost(
       local_cert_, *local_private_key_, shared_secret_hash_.value,
       shared_secret_hash_.hash_function);
 }
 
 }  // namespace protocol
 }  // namespace remoting