// Berkeley Open Infrastructure for Network Computing
// http://boinc.berkeley.edu
// Copyright (C) 2005 University of California
//
// This is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation;
// either version 2.1 of the License, or (at your option) any later version.
//
// This software is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// To view the GNU Lesser General Public License visit
// http://www.gnu.org/copyleft/lesser.html
// or write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


#if defined(_WIN32) && !defined(__STDWX_H__) && !defined(_BOINC_WIN_) && !defined(_AFX_STDAFX_H_)
#include "boinc_win.h"
#endif

#ifndef _WIN32
#include <string>
#endif

#include "browser.h"

//
//   walk through the various browsers looking up the
//   project cookies until the projects 'Setup' cookie is found.
//
// Give preference to the default platform specific browers first before going
//   to the platform independant browsers since most people don't switch from
//   the default.
// 
bool detect_setup_authenticator(
    std::string& project_url, std::string& authenticator
) {
#ifdef _WIN32
    if (detect_setup_authenticator_ie(project_url, authenticator)) {
        return true;
    }
#endif
    if (detect_setup_authenticator_firefox(project_url, authenticator)) {
        return true;
    }

    return false;
}

bool detect_setup_authenticator_firefox(
    std::string& project_url, std::string& authenticator
) {
    return false;
}

#ifdef _WIN32
//
// Detect the 'Setup' cookie in Internet Explorer by using the InternetGetCookie API.
//
// This is a Windows only browser.
//
bool detect_setup_authenticator_ie(std::string& project_url, std::string& authenticator)
{
    bool        bReturnValue = FALSE;
    BOOL        bValidates = TRUE;
    char        szCookieBuffer[2048];
    char*       pszCookieFragment = NULL;
    DWORD       dwSize = sizeof(szCookieBuffer)/sizeof(char);
    std::string strCookieFragment;
    std::string strCookieName;
    std::string strCookieValue;
    size_t      uiDelimeterLocation;

    bReturnValue = InternetGetCookie(project_url.c_str(), NULL, szCookieBuffer, &dwSize) == TRUE;
    if (bReturnValue)
    {
        // Format of cookie buffer:
        // 'cookie1=value1; cookie2=value2; cookie3=value3;
        //
        pszCookieFragment = strtok(szCookieBuffer, "; ");
        while(pszCookieFragment)
        {
            // Convert to a std::string so we can go to town
            strCookieFragment = pszCookieFragment;

            // Extract the name & value
            uiDelimeterLocation = strCookieFragment.find("=", 0);
            strCookieName = strCookieFragment.substr(0, uiDelimeterLocation);
            strCookieValue = strCookieFragment.substr(uiDelimeterLocation + 1);

            if (std::string("Setup") == strCookieName)
            {
                // Perform some basic validation of the suspect authenticator
                //

                // If the string is null then it is invalid.
                if (0 == strCookieValue.length()) {
                    bValidates = FALSE;
                }

                // If the string contains non alpha numeric characters it is invalid.
                std::string::iterator it = strCookieValue.begin();
                while (it != strCookieValue.end()) {
                    if (!_istalpha(*it) && !_istdigit(*it)) {
                        bValidates = FALSE;
                    }
                    it++;
                }

                // If validation failed, null out the authenticator just in case
                //   somebody tries to use it, otherwise copy in the real deal.
                if (!bValidates) {
                    authenticator = "";
                } else {
                    authenticator = strCookieValue;
                }
            }

            pszCookieFragment = strtok(NULL, "; ");
        }
    }

    return bReturnValue;
}
#endif