confutils.php

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

/*
 * line prefix used to negate single value config items
 * (scheme.conf & stopwords.conf), e.g.
 * !gopher
 */
const DOKU_CONF_NEGATION = '!';

/**
 * 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>
 *
 * @param string $file file name
 * @param bool   $knownonly
 * @return array with extension, mimetype and if it should be downloaded
 */
function mimetype($file, $knownonly=true){
    $mtypes = getMimeTypes();     // known mimetypes
    $ext    = strrpos($file, '.');
    if ($ext === false) {
        return array(false, false, false);
    }
    $ext = strtolower(substr($file, $ext + 1));
    if (!isset($mtypes[$ext])){
        if ($knownonly) {
            return array(false, false, false);
        } else {
            return array($ext, 'application/octet-stream', true);
        }
    }
    if($mtypes[$ext][0] == '!'){
        return array($ext, substr($mtypes[$ext],1), true);
    }else{
        return array($ext, $mtypes[$ext], false);
    }
}

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

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

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

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

        //add sepecial case 'this'
        $wikis['this'] = DOKU_URL.'{NAME}';
    }
    return $wikis;
}

/**
 * Returns the jquery script URLs for the versions defined in lib/scripts/jquery/versions
 *
 * @trigger CONFUTIL_CDN_SELECT
 * @return array
 */
function getCdnUrls() {
    global $conf;

    // load version info
    $versions = array();
    $lines = file(DOKU_INC . 'lib/scripts/jquery/versions');
    foreach($lines as $line) {
        $line = trim(preg_replace('/#.*$/', '', $line));
        if($line === '') continue;
        list($key, $val) = explode('=', $line, 2);
        $key = trim($key);
        $val = trim($val);
        $versions[$key] = $val;
    }

    $src = array();
    $data = array(
        'versions' => $versions,
        'src' => &$src
    );
    $event = new Doku_Event('CONFUTIL_CDN_SELECT', $data);
    if($event->advise_before()) {
        if(!$conf['jquerycdn']) {
            $jqmod = md5(join('-', $versions));
            $src[] = DOKU_BASE . 'lib/exe/jquery.php' . '?tseed=' . $jqmod;
        } elseif($conf['jquerycdn'] == 'jquery') {
            $src[] = sprintf('https://code.jquery.com/jquery-%s.min.js', $versions['JQ_VERSION']);
            $src[] = sprintf('https://code.jquery.com/jquery-migrate-%s.min.js', $versions['JQM_VERSION']);
            $src[] = sprintf('https://code.jquery.com/ui/%s/jquery-ui.min.js', $versions['JQUI_VERSION']);
        } elseif($conf['jquerycdn'] == 'cdnjs') {
            $src[] = sprintf('https://cdnjs.cloudflare.com/ajax/libs/jquery/%s/jquery.min.js', $versions['JQ_VERSION']);
            $src[] = sprintf('https://cdnjs.cloudflare.com/ajax/libs/jquery-migrate/%s/jquery-migrate.min.js', $versions['JQM_VERSION']);
            $src[] = sprintf('https://cdnjs.cloudflare.com/ajax/libs/jqueryui/%s/jquery-ui.min.js', $versions['JQUI_VERSION']);
        }
    }
    $event->advise_after();

    return $src;
}

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

/**
 * Gets the list of configured schemes
 *
 * @return array the schemes
 */
function getSchemes() {
    static $schemes = null;
    if ( !$schemes ) {
        $schemes = retrieveConfig('scheme','file',null,'array_merge_with_removal');
        $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>
 *
 * @param array $lines
 * @param bool $lower
 *
 * @return array
 */
function linesToHash($lines, $lower = false) {
    $conf = array();
    // remove BOM
    if(isset($lines[0]) && substr($lines[0], 0, 3) == pack('CCC', 0xef, 0xbb, 0xbf))
        $lines[0] = substr($lines[0], 3);
    foreach($lines as $line) {
        //ignore comments (except escaped ones)
        $line = preg_replace('/(?<![&\\\\])#.*$/', '', $line);
        $line = str_replace('\\#', '#', $line);
        $line = trim($line);
        if($line === '') continue;
        $line = preg_split('/\s+/', $line, 2);
        $line = array_pad($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>
 *
 * @param string $file
 * @param bool $lower
 *
 * @return array
 */
function confToHash($file,$lower=false) {
    $conf = array();
    $lines = @file( $file );
    if ( !$lines ) return $conf;

    return linesToHash($lines, $lower);
}

/**
 * Read a json config file into an array
 *
 * @param string $file
 * @return array
 */
function jsonToArray($file)
{
    $json = file_get_contents($file);

    $conf = json_decode($json, true);

    $jsonError = json_last_error();
    if (!is_array($conf) && $jsonError !== JSON_ERROR_NONE) {

        switch ($jsonError) {
            case JSON_ERROR_DEPTH:
                $jsonErrorText = 'The maximum stack depth has been exceeded';
                break;
            case JSON_ERROR_STATE_MISMATCH:
                $jsonErrorText = 'Invalid or malformed JSON';
                break;
            case JSON_ERROR_CTRL_CHAR:
                $jsonErrorText = 'Control character error, possibly incorrectly encoded';
                break;
            case JSON_ERROR_SYNTAX:
                $jsonErrorText = 'Syntax error';
                break;
            case JSON_ERROR_UTF8:
                $jsonErrorText = 'Malformed UTF-8 characters, possibly incorrectly encoded';
                break;
            case JSON_ERROR_RECURSION:
                $jsonErrorText = 'One or more recursive references in the value to be encoded';
                break;
            case JSON_ERROR_INF_OR_NAN:
                $jsonErrorText = 'One or more NAN or INF values in the value to be encoded';
                break;
            case JSON_ERROR_UNSUPPORTED_TYPE:
                $jsonErrorText = 'A value of a type that cannot be encoded was given';
                break;
            case JSON_ERROR_INVALID_PROPERTY_NAME:
                $jsonErrorText = 'A property name that cannot be encoded was given';
                break;
            case JSON_ERROR_UTF16:
                $jsonErrorText = 'Malformed UTF-16 characters, possibly incorrectly encoded';
                break;
            default:
                $jsonErrorText = 'Unknown Error Code';
        }

        trigger_error('JSON decoding error "' . $jsonErrorText . '" for file ' . $file, E_USER_WARNING);
        return [];
    }

    return $conf;
}

/**
 * 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    $params   optional additional params to pass to the callback
 * @param  callback $combine  the function used to combine arrays of values read from different configuration files;
 *                            the function takes two parameters,
 *                               $combined - the already read & merged configuration values
 *                               $new - array of config values from the config cascade file being currently processed
 *                            and returns an array of the merged configuration values.
 * @return array    configuration values
 */
function retrieveConfig($type,$fn,$params=null,$combine='array_merge') {
    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 = $combine($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>
 * @param string $action
 * @returns boolean true if enabled, false if disabled
 */
function actionOK($action){
    static $disabled = null;
    if(is_null($disabled) || defined('SIMPLE_TEST')){
        global $conf;
        /** @var DokuWiki_Auth_Plugin $auth */
        global $auth;

        // prepare disabled actions array and handle legacy options
        $disabled = explode(',',$conf['disableactions']);
        $disabled = array_map('trim',$disabled);
        if((isset($conf['openregister']) && !$conf['openregister']) || is_null($auth) || !$auth->canDo('addUser')) {
            $disabled[] = 'register';
        }
        if((isset($conf['resendpasswd']) && !$conf['resendpasswd']) || is_null($auth) || !$auth->canDo('modPass')) {
            $disabled[] = 'resendpwd';
        }
        if((isset($conf['subscribers']) && !$conf['subscribers']) || is_null($auth)) {
            $disabled[] = 'subscribe';
        }
        if (is_null($auth) || !$auth->canDo('Profile')) {
            $disabled[] = 'profile';
        }
        if (is_null($auth) || !$auth->canDo('delUser')) {
            $disabled[] = 'profile_delete';
        }
        if (is_null($auth)) {
            $disabled[] = 'login';
        }
        if (is_null($auth) || !$auth->canDo('logout')) {
            $disabled[] = 'logout';
        }
        $disabled = array_unique($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
 * @return  boolean             true if headings should be used for $linktype, false otherwise
 */
function useHeading($linktype) {
    static $useHeading = null;
    if(defined('DOKU_UNITTEST')) $useHeading = null; // don't cache during unit tests

    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 encoded (or unknown)
                     return $str;
    }
}

/**
 * array combination function to remove negated values (prefixed by !)
 *
 * @param  array $current
 * @param  array $new
 *
 * @return array the combined array, numeric keys reset
 */
function array_merge_with_removal($current, $new) {
    foreach ($new as $val) {
        if (substr($val,0,1) == DOKU_CONF_NEGATION) {
            $idx = array_search(trim(substr($val,1)),$current);
            if ($idx !== false) {
                unset($current[$idx]);
            }
        } else {
            $current[] = trim($val);
        }
    }

    return array_slice($current,0);
}
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