text: // 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 "google_apis/gaia/gaia_auth_util.h"
  
  #include <vector>
  
  #include "base/logging.h"
  #include "base/string_split.h"
  #include "base/string_util.h"
  #include "google_apis/gaia/gaia_urls.h"
  #include "googleurl/src/gurl.h"
  
  namespace gaia {
  
  namespace {
  const char kGmailDomain[] = "gmail.com";
  }
  
  std::string CanonicalizeEmail(const std::string& email_address) {
    std::vector<std::string> parts;
    char at = '@';
    base::SplitString(email_address, at, &parts);
    if (parts.size() != 2U)
      NOTREACHED() << "expecting exactly one @, but got " << parts.size();
    else if (parts[1] == kGmailDomain)  // only strip '.' for gmail accounts.
      RemoveChars(parts[0], ".", &parts[0]);
    std::string new_email = StringToLowerASCII(JoinString(parts, at));
    VLOG(1) << "Canonicalized " << email_address << " to " << new_email;
    return new_email;
  }
  
  std::string CanonicalizeDomain(const std::string& domain) {
    // Canonicalization of domain names means lower-casing them. Make sure to
    // update this function in sync with Canonicalize if this ever changes.
    return StringToLowerASCII(domain);
  }
  
  std::string SanitizeEmail(const std::string& email_address) {
    std::string sanitized(email_address);
  
    // Apply a default domain if necessary.
    if (sanitized.find('@') == std::string::npos) {
      sanitized += '@';
      sanitized += kGmailDomain;
    }
  
    return sanitized;
  }
  
  std::string ExtractDomainName(const std::string& email_address) {
    // First canonicalize which will also verify we have proper domain part.
    std::string email = CanonicalizeEmail(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();
  }
  
  bool IsGaiaSignonRealm(const GURL& url) {
    if (!url.SchemeIsSecure())
      return false;
  
    return url == GURL(GaiaUrls::GetInstance()->gaia_origin_url());
  }
  
  }  // namespace gaia
  