<?php

function check_permissions($nick, $params, $quiet = true)

{

  global $permissions, $irc;

  // I have all the power.

  if ( $nick === $GLOBALS['nick'] )

  {

    if ( defined('LIBIRC_DEBUG') )

      echo "[!!!] Granted action {$params['context']} to {$GLOBALS['nick']} (self)\n";

    return true;

  }

  // Is the user in the permissions table?

  if ( !isset($permissions[$nick]) )

  {

    if ( defined('LIBIRC_DEBUG') )

      echo "[!!!] Denied action {$params['context']} to {$nick} (not in table)\n";

    return false;

  }

  // Make sure the user is identified

  $whois = $irc->whois($nick);

  if ( !$whois || ( $whois && !$whois['identified']) )

  {

    if ( defined('LIBIRC_DEBUG') )

      echo "[!!!] Denied action {$params['context']} to {$nick} (whois check failed)\n";

    if ( !$quiet )

      $irc->privmsg($nick, "Please identify to services before you do that. (If you are already identified, wait 20 seconds for the whois cache to clear and try again)");

    return false;

  }

  // Is the user an admin?

  if ( in_array('admin', $permissions[$nick]) && $params['context'] !== 'alert' )

  {

    if ( defined('LIBIRC_DEBUG') )

      echo "[!!!] Granted action {$params['context']} to {$nick} (has admin rights)\n";

    return true;

  }

  switch($params['context']):

    case 'channel':

      if ( isset($permissions[$nick]['channel']) && is_array($permissions[$nick]['channel']) )

      {

        if ( in_array($params['channel'], $permissions[$nick]['channel']) )

        {

          if ( defined('LIBIRC_DEBUG') )

            echo "[!!!] Granted action {$params['context']} to {$nick} in channel {$params['channel']} (on channel whitelist)\n";

          return true;

        }

      }

      if ( defined('LIBIRC_DEBUG') )

        echo "[!!!] Denied action {$params['context']} to {$nick} in channel {$params['channel']} (not on channel whitelist)\n";

      return false;

    default:

      eval(eb_fetch_hook('permission_check'));

      if ( isset($result) )

      {

        $perm = $result ? 'Granted' : 'Denied';

        if ( defined('LIBIRC_DEBUG') )

          echo "[!!!] $perm action {$params['context']} to {$nick} (plugin overridden)\n";

        return $result;

      }

      $result = in_array($params['context'], $permissions[$nick]);

      $perm = $result ? 'Granted' : 'Denied';

      if ( defined('LIBIRC_DEBUG') )

        echo "[!!!] $perm action {$params['context']} to {$nick} (default handler)\n";

      return $result;

  endswitch;

}