[Chrome OS] Refactor Canonicalize() method into base class to prepare for new Authenticator subclass

chrome/browser/chromeos/login/authenticator.cc

+// Copyright (c) 2010 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"
+#include "base/string_split.h"
+#include "base/string_util.h"
+
+namespace chromeos {
+class LoginStatusConsumer;
+
+Authenticator::Authenticator(LoginStatusConsumer* consumer)
+    : consumer_(consumer) {
+}
+
+Authenticator::~Authenticator() {}
+
+// static
+std::string Authenticator::Canonicalize(const std::string& email_address) {
+  std::vector<std::string> parts;
+  char at = '@';
+  SplitString(email_address, at, &parts);
+  DCHECK_EQ(parts.size(), 2U) << "email_address should have only one @";
+  RemoveChars(parts[0], ".", &parts[0]);
+  if (parts[0].find('+') != std::string::npos)
+    parts[0].erase(parts[0].find('+'));
+  std::string new_email = StringToLowerASCII(JoinString(parts, at));
+  LOG(INFO) << "Canonicalized " << email_address << " to " << new_email;
+  return new_email;
+}
+
+}  // namespace chromeos