Allow re-enrollment to the same domain in case of policy data loss.

chrome/browser/chromeos/login/authenticator.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 "chrome/browser/chromeos/login/authenticator.h"
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 34 matching lines @@
 
   // Apply a default domain if necessary.
   if (sanitized.find('@') == std::string::npos) {
     sanitized += '@';
     sanitized += kGmailDomain;
   }
 
   return sanitized;
 }
 
+// static
+std::string Authenticator::ExtractDomainName(const std::string& email_address) {
+  // First canonicalize which will also verify we have proper domain part.
+  std::string email = Canonicalize(email_address);
+  size_t separator_pos = email.find('@');
+  if (separator_pos != email.npos && separator_pos < email.length() - 1)
+    return email.substr(separator_pos + 1);
+  else
+    NOTREACHED() << "Not a proper email address: " << email;
+  return std::string();
+}
+
 }  // namespace chromeos