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#ifndef MOZC_SYNC_OAUTH2_TOKEN_UTIL_H_
#define MOZC_SYNC_OAUTH2_TOKEN_UTIL_H_

#include <string>
#include "base/port.h"

namespace mozc {
namespace sync {
// Common util for parsing OAuth2 access token.
// Google's OAuth2 page http://code.google.com/apis/accounts/docs/OAuth2.html
// says:
// | On many platforms, your application should be able to monitor the window
// | title of a browser window it creates and close the window when it sees a
// | valid response.
class OAuth2TokenUtil {
 public:
  // Returns access token from the given window title.
  // Returns an empty string if it fails to parse the window title.
  // On Windows, typical browsers sets their window title as follows when the
  // access token is granted from the Google's OAuth2 server.
  // Google Chrome 15.0.874.106 m
  //   "Success code=4/a1B2c3D4e5F6g7H8i9J1k2l3M4n5 - Google Chrome"
  // Mozilla Firefox 8.0
  //   "Success code=4/a1B2c3D4e5F6g7H8i9J1k2l3M4n5 - Mozilla Firefox"
  // Opera 11.52
  //   "Success code=4/a1B2c3D4e5F6g7H8i9J1k2l3M4n5 - Opera"
  // Microsoft Internet Explorer 9
  //   "Success code=4/a1B2c3D4e5F6g7H8i9J1k2l3M4n5 - Windows Internet Explorer"
  static string ParseAuthCodeFromWindowTitleForWindows(const string &title);

  // Mostly same as "ForWindows", but Mac APIs do not have application
  // names in the window title, so we don't need to take care of the
  // remaining part of " - Google Chrome".
  static string ParseAuthCodeFromWindowTitleForMac(const string &title);

 private:
  OAuth2TokenUtil() {}
  ~OAuth2TokenUtil() {}
  DISALLOW_COPY_AND_ASSIGN(OAuth2TokenUtil);
};
}  // sync
}  // mozc

#endif  // MOZC_SYNC_OAUTH2_TOKEN_UTIL_H_