<?php
/**
 * Utilities for collecting data from config files
 *
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Harry Fuecks <hfuecks@gmail.com>
 */


/**
 * Returns the (known) extension and mimetype of a given filename
 *
 * If $knownonly is true (the default), then only known extensions
 * are returned.
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function mimetype($file, $knownonly=true){
  $ret    = array(false,false,false); // return array
  $mtypes = getMimeTypes();     // known mimetypes
  $exts   = join('|',array_keys($mtypes));  // known extensions (regexp)
  if(!$knownonly){
    $exts = $exts.'|[_\-A-Za-z0-9]+';  // any extension
  }
  if(preg_match('#\.('.$exts.')$#i',$file,$matches)){
    $ext = strtolower($matches[1]);
  }

  if($ext){
    if (isset($mtypes[$ext])){
      if($mtypes[$ext][0] == '!'){
          $ret = array($ext, substr($mtypes[$ext],1), true);
      }else{
          $ret = array($ext, $mtypes[$ext], false);
      }
    }elseif(!$knownonly){
      $ret = array($ext, 'application/octet-stream', true);
    }
  }

  return $ret;
}

/**
 * returns a hash of mimetypes
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function getMimeTypes() {
  static $mime = NULL;
  if ( !$mime ) {
    $mime = retrieveConfig('mime','confToHash');
  }
  return $mime;
}

/**
 * returns a hash of acronyms
 *
 * @author Harry Fuecks <hfuecks@gmail.com>
 */
function getAcronyms() {
  static $acronyms = NULL;
  if ( !$acronyms ) {
    $acronyms = retrieveConfig('acronyms','confToHash');
  }
  return $acronyms;
}

/**
 * returns a hash of smileys
 *
 * @author Harry Fuecks <hfuecks@gmail.com>
 */
function getSmileys() {
  static $smileys = NULL;
  if ( !$smileys ) {
    $smileys = retrieveConfig('smileys','confToHash');
  }
  return $smileys;
}

/**
 * returns a hash of entities
 *
 * @author Harry Fuecks <hfuecks@gmail.com>
 */
function getEntities() {
  static $entities = NULL;
  if ( !$entities ) {
    $entities = retrieveConfig('entities','confToHash');
  }
  return $entities;
}

/**
 * returns a hash of interwikilinks
 *
 * @author Harry Fuecks <hfuecks@gmail.com>
 */
function getInterwiki() {
  static $wikis = NULL;
  if ( !$wikis ) {
    $wikis = retrieveConfig('interwiki','confToHash',array(true));
  }
  //add sepecial case 'this'
  $wikis['this'] = DOKU_URL.'{NAME}';
  return $wikis;
}

/**
 * returns array of wordblock patterns
 *
 */
function getWordblocks() {
  static $wordblocks = NULL;
  if ( !$wordblocks ) {
    $wordblocks = retrieveConfig('wordblock','file');
  }
  return $wordblocks;
}


function getSchemes() {
  static $schemes = NULL;
  if ( !$schemes ) {
    $schemes = retrieveConfig('scheme','file');
  }
  $schemes = array_map('trim', $schemes);
  $schemes = preg_replace('/^#.*/', '', $schemes);
  $schemes = array_filter($schemes);
  return $schemes;
}

/**
 * Builds a hash from an array of lines
 *
 * If $lower is set to true all hash keys are converted to
 * lower case.
 *
 * @author Harry Fuecks <hfuecks@gmail.com>
 * @author Andreas Gohr <andi@splitbrain.org>
 * @author Gina Haeussge <gina@foosel.net>
 */
function linesToHash($lines, $lower=false) {
  foreach ( $lines as $line ) {
    //ignore comments (except escaped ones)
    $line = preg_replace('/(?<![&\\\\])#.*$/','',$line);
    $line = str_replace('\\#','#',$line);
    $line = trim($line);
    if(empty($line)) continue;
    $line = preg_split('/\s+/',$line,2);
    // Build the associative array
    if($lower){
      $conf[strtolower($line[0])] = $line[1];
    }else{
      $conf[$line[0]] = $line[1];
    }
  }

  return $conf;
}

/**
 * Builds a hash from a configfile
 *
 * If $lower is set to true all hash keys are converted to
 * lower case.
 *
 * @author Harry Fuecks <hfuecks@gmail.com>
 * @author Andreas Gohr <andi@splitbrain.org>
 * @author Gina Haeussge <gina@foosel.net>
 */
function confToHash($file,$lower=false) {
  $conf = array();
  $lines = @file( $file );
  if ( !$lines ) return $conf;

  return linesToHash($lines, $lower);
}

/**
 * Retrieve the requested configuration information
 *
 * @author Chris Smith <chris@jalakai.co.uk>
 *
 * @param  string   $type     the configuration settings to be read, must correspond to a key/array in $config_cascade
 * @param  callback $fn       the function used to process the configuration file into an array
 * @param  array    $param    optional additional params to pass to the callback
 * @return array    configuration values
 */
function retrieveConfig($type,$fn,$params=null) {
  global $config_cascade;

  if(!is_array($params)) $params = array();

  $combined = array();
  if (!is_array($config_cascade[$type])) trigger_error('Missing config cascade for "'.$type.'"',E_USER_WARNING);
  foreach (array('default','local','protected') as $config_group) {
    if (empty($config_cascade[$type][$config_group])) continue;
    foreach ($config_cascade[$type][$config_group] as $file) {
      if (@file_exists($file)) {
        $config = call_user_func_array($fn,array_merge(array($file),$params));
        $combined = array_merge($combined, $config);
      }
    }
  }

  return $combined;
}

/**
 * Include the requested configuration information
 *
 * @author Chris Smith <chris@jalakai.co.uk>
 *
 * @param  string   $type     the configuration settings to be read, must correspond to a key/array in $config_cascade
 * @return array              list of files, default before local before protected
 */
function getConfigFiles($type) {
  global $config_cascade;
  $files = array();

  if (!is_array($config_cascade[$type])) trigger_error('Missing config cascade for "'.$type.'"',E_USER_WARNING);
  foreach (array('default','local','protected') as $config_group) {
    if (empty($config_cascade[$type][$config_group])) continue;
    $files = array_merge($files, $config_cascade[$type][$config_group]);
  }

  return $files;
}

/**
 * check if the given action was disabled in config
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 * @returns boolean true if enabled, false if disabled
 */
function actionOK($action){
  static $disabled = null;
  if(is_null($disabled)){
    global $conf;

    // prepare disabled actions array and handle legacy options
    $disabled = explode(',',$conf['disableactions']);
    $disabled = array_map('trim',$disabled);
    if(isset($conf['openregister']) && !$conf['openregister']) $disabled[] = 'register';
    if(isset($conf['resendpasswd']) && !$conf['resendpasswd']) $disabled[] = 'resendpwd';
    if(isset($conf['subscribers']) && !$conf['subscribers']) {
        $disabled[] = 'subscribe';
        $disabled[] = 'subscribens';
    }
    $disabled = array_unique($disabled);
  }

  return !in_array($action,$disabled);
}

/**
 * check if headings should be used as link text for the specified link type
 *
 * @author Chris Smith <chris@jalakai.co.uk>
 *
 * @param   string  $linktype   'content'|'navigation', content applies to links in wiki text
 *                                                      navigation applies to all other links
 * @returns boolean             true if headings should be used for $linktype, false otherwise
 */
function useHeading($linktype) {
  static $useHeading = null;

  if (is_null($useHeading)) {
    global $conf;

    if (!empty($conf['useheading'])) {
      switch ($conf['useheading']) {
        case 'content'    : $useHeading['content'] = true; break;
        case 'navigation' : $useHeading['navigation'] = true; break;
        default:
          $useHeading['content'] = true;
          $useHeading['navigation'] = true;
      }
    } else {
      $useHeading = array();
    }
  }

  return (!empty($useHeading[$linktype]));
}

/**
 * obscure config data so information isn't plain text
 *
 * @param string       $str     data to be encoded
 * @param string       $code    encoding method, values: plain, base64, uuencode.
 * @return string               the encoded value
 */
function conf_encodeString($str,$code) {
  switch ($code) {
    case 'base64'   : return '<b>'.base64_encode($str);
    case 'uuencode' : return '<u>'.convert_uuencode($str);
    case 'plain':
    default:
      return $str;
  }
}
/**
 * return obscured data as plain text
 *
 * @param  string      $str   encoded data
 * @return string             plain text
 */
function conf_decodeString($str) {
  switch (substr($str,0,3)) {
    case '<b>' : return base64_decode(substr($str,3));
    case '<u>' : return convert_uudecode(substr($str,3));
    default:  // not encode (or unknown)
      return $str;
  }
}
//Setup VIM: ex: et ts=2 enc=utf-8 :