Dokuwiki module for Elgg 1.7

1 files changed, 593 insertions, 0 deletions

diff --git a/lib/dokuwiki/inc/io.php b/lib/dokuwiki/inc/io.php
new file mode 100644
index 000000000..32a6f7b8e
--- /dev/null
+++ b/lib/dokuwiki/inc/io.php
@@ -0,0 +1,593 @@
+<?php
+/**
+ * File IO functions
+ *
+ * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
+ * @author     Andreas Gohr <andi@splitbrain.org>
+ */
+
+if(!defined('DOKU_INC')) die('meh.');
+require_once(DOKU_INC.'inc/common.php');
+require_once(DOKU_INC.'inc/HTTPClient.php');
+require_once(DOKU_INC.'inc/events.php');
+require_once(DOKU_INC.'inc/utf8.php');
+
+/**
+ * Removes empty directories
+ *
+ * Sends IO_NAMESPACE_DELETED events for 'pages' and 'media' namespaces.
+ * Event data:
+ * $data[0]    ns: The colon separated namespace path minus the trailing page name.
+ * $data[1]    ns_type: 'pages' or 'media' namespace tree.
+ *
+ * @todo use safemode hack
+ * @param string $id      - a pageid, the namespace of that id will be tried to deleted
+ * @param string $basadir - the config name of the type to delete (datadir or mediadir usally)
+ * @returns bool - true if at least one namespace was deleted
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ * @author Ben Coburn <btcoburn@silicodon.net>
+ */
+function io_sweepNS($id,$basedir='datadir'){
+    global $conf;
+    $types = array ('datadir'=>'pages', 'mediadir'=>'media');
+    $ns_type = (isset($types[$basedir])?$types[$basedir]:false);
+
+    $delone = false;
+
+    //scan all namespaces
+    while(($id = getNS($id)) !== false){
+        $dir = $conf[$basedir].'/'.utf8_encodeFN(str_replace(':','/',$id));
+
+        //try to delete dir else return
+        if(@rmdir($dir)) {
+            if ($ns_type!==false) {
+                $data = array($id, $ns_type);
+                $delone = true; // we deleted at least one dir
+                trigger_event('IO_NAMESPACE_DELETED', $data);
+            }
+        } else { return $delone; }
+    }
+    return $delone;
+}
+
+/**
+ * Used to read in a DokuWiki page from file, and send IO_WIKIPAGE_READ events.
+ *
+ * Generates the action event which delegates to io_readFile().
+ * Action plugins are allowed to modify the page content in transit.
+ * The file path should not be changed.
+ *
+ * Event data:
+ * $data[0]    The raw arguments for io_readFile as an array.
+ * $data[1]    ns: The colon separated namespace path minus the trailing page name. (false if root ns)
+ * $data[2]    page_name: The wiki page name.
+ * $data[3]    rev: The page revision, false for current wiki pages.
+ *
+ * @author Ben Coburn <btcoburn@silicodon.net>
+ */
+function io_readWikiPage($file, $id, $rev=false) {
+    if (empty($rev)) { $rev = false; }
+    $data = array(array($file, false), getNS($id), noNS($id), $rev);
+    return trigger_event('IO_WIKIPAGE_READ', $data, '_io_readWikiPage_action', false);
+}
+
+/**
+ * Callback adapter for io_readFile().
+ * @author Ben Coburn <btcoburn@silicodon.net>
+ */
+function _io_readWikiPage_action($data) {
+    if (is_array($data) && is_array($data[0]) && count($data[0])===2) {
+        return call_user_func_array('io_readFile', $data[0]);
+    } else {
+        return ''; //callback error
+    }
+}
+
+/**
+ * Returns content of $file as cleaned string.
+ *
+ * Uses gzip if extension is .gz
+ *
+ * If you want to use the returned value in unserialize
+ * be sure to set $clean to false!
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ */
+function io_readFile($file,$clean=true){
+    $ret = '';
+    if(@file_exists($file)){
+        if(substr($file,-3) == '.gz'){
+            $ret = join('',gzfile($file));
+        }else if(substr($file,-4) == '.bz2'){
+            $ret = bzfile($file);
+        }else{
+            $ret = file_get_contents($file);
+        }
+    }
+    if($clean){
+        return cleanText($ret);
+    }else{
+        return $ret;
+    }
+}
+/**
+ * Returns the content of a .bz2 compressed file as string
+ * @author marcel senf <marcel@rucksackreinigung.de>
+ */
+
+function bzfile($file){
+    $bz = bzopen($file,"r");
+    while (!feof($bz)){
+        //8192 seems to be the maximum buffersize?
+        $str = $str . bzread($bz,8192);
+    }
+    bzclose($bz);
+    return $str;
+}
+
+
+/**
+ * Used to write out a DokuWiki page to file, and send IO_WIKIPAGE_WRITE events.
+ *
+ * This generates an action event and delegates to io_saveFile().
+ * Action plugins are allowed to modify the page content in transit.
+ * The file path should not be changed.
+ * (The append parameter is set to false.)
+ *
+ * Event data:
+ * $data[0]    The raw arguments for io_saveFile as an array.
+ * $data[1]    ns: The colon separated namespace path minus the trailing page name. (false if root ns)
+ * $data[2]    page_name: The wiki page name.
+ * $data[3]    rev: The page revision, false for current wiki pages.
+ *
+ * @author Ben Coburn <btcoburn@silicodon.net>
+ */
+function io_writeWikiPage($file, $content, $id, $rev=false) {
+    if (empty($rev)) { $rev = false; }
+    if ($rev===false) { io_createNamespace($id); } // create namespaces as needed
+    $data = array(array($file, $content, false), getNS($id), noNS($id), $rev);
+    return trigger_event('IO_WIKIPAGE_WRITE', $data, '_io_writeWikiPage_action', false);
+}
+
+/**
+ * Callback adapter for io_saveFile().
+ * @author Ben Coburn <btcoburn@silicodon.net>
+ */
+function _io_writeWikiPage_action($data) {
+    if (is_array($data) && is_array($data[0]) && count($data[0])===3) {
+        return call_user_func_array('io_saveFile', $data[0]);
+    } else {
+        return false; //callback error
+    }
+}
+
+/**
+ * Saves $content to $file.
+ *
+ * If the third parameter is set to true the given content
+ * will be appended.
+ *
+ * Uses gzip if extension is .gz
+ * and bz2 if extension is .bz2
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ * @return bool true on success
+ */
+function io_saveFile($file,$content,$append=false){
+    global $conf;
+    $mode = ($append) ? 'ab' : 'wb';
+
+    $fileexists = @file_exists($file);
+    io_makeFileDir($file);
+    io_lock($file);
+    if(substr($file,-3) == '.gz'){
+        $fh = @gzopen($file,$mode.'9');
+        if(!$fh){
+            msg("Writing $file failed",-1);
+            io_unlock($file);
+            return false;
+        }
+        gzwrite($fh, $content);
+        gzclose($fh);
+    }else if(substr($file,-4) == '.bz2'){
+        $fh = @bzopen($file,$mode{0});
+        if(!$fh){
+            msg("Writing $file failed", -1);
+            io_unlock($file);
+            return false;
+        }
+        bzwrite($fh, $content);
+        bzclose($fh);
+    }else{
+        $fh = @fopen($file,$mode);
+        if(!$fh){
+            msg("Writing $file failed",-1);
+            io_unlock($file);
+            return false;
+        }
+        fwrite($fh, $content);
+        fclose($fh);
+    }
+
+    if(!$fileexists and !empty($conf['fperm'])) chmod($file, $conf['fperm']);
+    io_unlock($file);
+    return true;
+}
+
+/**
+ * Delete exact linematch for $badline from $file.
+ *
+ * Be sure to include the trailing newline in $badline
+ *
+ * Uses gzip if extension is .gz
+ *
+ * 2005-10-14 : added regex option -- Christopher Smith <chris@jalakai.co.uk>
+ *
+ * @author Steven Danz <steven-danz@kc.rr.com>
+ * @return bool true on success
+ */
+function io_deleteFromFile($file,$badline,$regex=false){
+    if (!@file_exists($file)) return true;
+
+    io_lock($file);
+
+    // load into array
+    if(substr($file,-3) == '.gz'){
+        $lines = gzfile($file);
+    }else{
+        $lines = file($file);
+    }
+
+    // remove all matching lines
+    if ($regex) {
+        $lines = preg_grep($badline,$lines,PREG_GREP_INVERT);
+    } else {
+        $pos = array_search($badline,$lines); //return null or false if not found
+        while(is_int($pos)){
+            unset($lines[$pos]);
+            $pos = array_search($badline,$lines);
+        }
+    }
+
+    if(count($lines)){
+        $content = join('',$lines);
+        if(substr($file,-3) == '.gz'){
+            $fh = @gzopen($file,'wb9');
+            if(!$fh){
+                msg("Removing content from $file failed",-1);
+                io_unlock($file);
+                return false;
+            }
+            gzwrite($fh, $content);
+            gzclose($fh);
+        }else{
+            $fh = @fopen($file,'wb');
+            if(!$fh){
+                msg("Removing content from $file failed",-1);
+                io_unlock($file);
+                return false;
+            }
+            fwrite($fh, $content);
+            fclose($fh);
+        }
+    }else{
+        @unlink($file);
+    }
+
+    io_unlock($file);
+    return true;
+}
+
+/**
+ * Tries to lock a file
+ *
+ * Locking is only done for io_savefile and uses directories
+ * inside $conf['lockdir']
+ *
+ * It waits maximal 3 seconds for the lock, after this time
+ * the lock is assumed to be stale and the function goes on
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function io_lock($file){
+    global $conf;
+    // no locking if safemode hack
+    if($conf['safemodehack']) return;
+
+    $lockDir = $conf['lockdir'].'/'.md5($file);
+    @ignore_user_abort(1);
+
+    $timeStart = time();
+    do {
+        //waited longer than 3 seconds? -> stale lock
+        if ((time() - $timeStart) > 3) break;
+        $locked = @mkdir($lockDir, $conf['dmode']);
+        if($locked){
+            if(!empty($conf['dperm'])) chmod($lockDir, $conf['dperm']);
+            break;
+        }
+        usleep(50);
+    } while ($locked === false);
+}
+
+/**
+ * Unlocks a file
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function io_unlock($file){
+    global $conf;
+    // no locking if safemode hack
+    if($conf['safemodehack']) return;
+
+    $lockDir = $conf['lockdir'].'/'.md5($file);
+    @rmdir($lockDir);
+    @ignore_user_abort(0);
+}
+
+/**
+ * Create missing namespace directories and send the IO_NAMESPACE_CREATED events
+ * in the order of directory creation. (Parent directories first.)
+ *
+ * Event data:
+ * $data[0]    ns: The colon separated namespace path minus the trailing page name.
+ * $data[1]    ns_type: 'pages' or 'media' namespace tree.
+ *
+ * @author Ben Coburn <btcoburn@silicodon.net>
+ */
+function io_createNamespace($id, $ns_type='pages') {
+    // verify ns_type
+    $types = array('pages'=>'wikiFN', 'media'=>'mediaFN');
+    if (!isset($types[$ns_type])) {
+        trigger_error('Bad $ns_type parameter for io_createNamespace().');
+        return;
+    }
+    // make event list
+    $missing = array();
+    $ns_stack = explode(':', $id);
+    $ns = $id;
+    $tmp = dirname( $file = call_user_func($types[$ns_type], $ns) );
+    while (!@is_dir($tmp) && !(@file_exists($tmp) && !is_dir($tmp))) {
+        array_pop($ns_stack);
+        $ns = implode(':', $ns_stack);
+        if (strlen($ns)==0) { break; }
+        $missing[] = $ns;
+        $tmp = dirname(call_user_func($types[$ns_type], $ns));
+    }
+    // make directories
+    io_makeFileDir($file);
+    // send the events
+    $missing = array_reverse($missing); // inside out
+    foreach ($missing as $ns) {
+        $data = array($ns, $ns_type);
+        trigger_event('IO_NAMESPACE_CREATED', $data);
+    }
+}
+
+/**
+ * Create the directory needed for the given file
+ *
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ */
+function io_makeFileDir($file){
+    global $conf;
+
+    $dir = dirname($file);
+    if(!@is_dir($dir)){
+        io_mkdir_p($dir) || msg("Creating directory $dir failed",-1);
+    }
+}
+
+/**
+ * Creates a directory hierachy.
+ *
+ * @link    http://www.php.net/manual/en/function.mkdir.php
+ * @author  <saint@corenova.com>
+ * @author  Andreas Gohr <andi@splitbrain.org>
+ */
+function io_mkdir_p($target){
+    global $conf;
+    if (@is_dir($target)||empty($target)) return 1; // best case check first
+    if (@file_exists($target) && !is_dir($target)) return 0;
+    //recursion
+    if (io_mkdir_p(substr($target,0,strrpos($target,'/')))){
+        if($conf['safemodehack']){
+            $dir = preg_replace('/^'.preg_quote(fullpath($conf['ftp']['root']),'/').'/','', $target);
+            return io_mkdir_ftp($dir);
+        }else{
+            $ret = @mkdir($target,$conf['dmode']); // crawl back up & create dir tree
+            if($ret && $conf['dperm']) chmod($target, $conf['dperm']);
+            return $ret;
+        }
+    }
+    return 0;
+}
+
+/**
+ * Creates a directory using FTP
+ *
+ * This is used when the safemode workaround is enabled
+ *
+ * @author <andi@splitbrain.org>
+ */
+function io_mkdir_ftp($dir){
+    global $conf;
+
+    if(!function_exists('ftp_connect')){
+        msg("FTP support not found - safemode workaround not usable",-1);
+        return false;
+    }
+
+    $conn = @ftp_connect($conf['ftp']['host'],$conf['ftp']['port'],10);
+    if(!$conn){
+        msg("FTP connection failed",-1);
+        return false;
+    }
+
+    if(!@ftp_login($conn, $conf['ftp']['user'], conf_decodeString($conf['ftp']['pass']))){
+        msg("FTP login failed",-1);
+        return false;
+    }
+
+    //create directory
+    $ok = @ftp_mkdir($conn, $dir);
+    //set permissions
+    @ftp_site($conn,sprintf("CHMOD %04o %s",$conf['dmode'],$dir));
+
+    @ftp_close($conn);
+    return $ok;
+}
+
+/**
+ * Creates a unique temporary directory and returns
+ * its path.
+ *
+ * @author Michael Klier <chi@chimeric.de>
+ */
+function io_mktmpdir() {
+    global $conf;
+
+    $base = $conf['tmpdir'];
+    $dir  = md5(uniqid(mt_rand(), true));
+    $tmpdir = $base.'/'.$dir;
+
+    if(io_mkdir_p($tmpdir)) {
+        return($tmpdir);
+    } else {
+        return false;
+    }
+}
+
+/**
+ * downloads a file from the net and saves it
+ *
+ * if $useAttachment is false,
+ * - $file is the full filename to save the file, incl. path
+ * - if successful will return true, false otherwise
+ *
+ * if $useAttachment is true,
+ * - $file is the directory where the file should be saved
+ * - if successful will return the name used for the saved file, false otherwise
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @author Chris Smith <chris@jalakai.co.uk>
+ */
+function io_download($url,$file,$useAttachment=false,$defaultName='',$maxSize=2097152){
+    global $conf;
+    $http = new DokuHTTPClient();
+    $http->max_bodysize = $maxSize;
+    $http->timeout = 25; //max. 25 sec
+
+    $data = $http->get($url);
+    if(!$data) return false;
+
+    if ($useAttachment) {
+        $name = '';
+        if (isset($http->resp_headers['content-disposition'])) {
+            $content_disposition = $http->resp_headers['content-disposition'];
+            $match=array();
+            if (is_string($content_disposition) &&
+                    preg_match('/attachment;\s*filename\s*=\s*"([^"]*)"/i', $content_disposition, $match)) {
+
+                $name = basename($match[1]);
+        }
+
+        }
+
+        if (!$name) {
+            if (!$defaultName) return false;
+            $name = $defaultName;
+        }
+
+        $file = $file.$name;
+    }
+
+    $fileexists = @file_exists($file);
+    $fp = @fopen($file,"w");
+    if(!$fp) return false;
+    fwrite($fp,$data);
+    fclose($fp);
+    if(!$fileexists and $conf['fperm']) chmod($file, $conf['fperm']);
+    if ($useAttachment) return $name;
+    return true;
+}
+
+/**
+ * Windows compatible rename
+ *
+ * rename() can not overwrite existing files on Windows
+ * this function will use copy/unlink instead
+ */
+function io_rename($from,$to){
+    global $conf;
+    if(!@rename($from,$to)){
+        if(@copy($from,$to)){
+            if($conf['fperm']) chmod($to, $conf['fperm']);
+            @unlink($from);
+            return true;
+        }
+        return false;
+    }
+    return true;
+}
+
+
+/**
+ * Runs an external command and returns it's output as string
+ *
+ * @author Harry Brueckner <harry_b@eml.cc>
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @deprecated
+ */
+function io_runcmd($cmd){
+    $fh = popen($cmd, "r");
+    if(!$fh) return false;
+    $ret = '';
+    while (!feof($fh)) {
+        $ret .= fread($fh, 8192);
+    }
+    pclose($fh);
+    return $ret;
+}
+
+/**
+ * Search a file for matching lines
+ *
+ * This is probably not faster than file()+preg_grep() but less
+ * memory intensive because not the whole file needs to be loaded
+ * at once.
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @param  string $file    The file to search
+ * @param  string $pattern PCRE pattern
+ * @param  int    $max     How many lines to return (0 for all)
+ * @param  bool   $baxkref When true returns array with backreferences instead of lines
+ * @return matching lines or backref, false on error
+ */
+function io_grep($file,$pattern,$max=0,$backref=false){
+    $fh = @fopen($file,'r');
+    if(!$fh) return false;
+    $matches = array();
+
+    $cnt  = 0;
+    $line = '';
+    while (!feof($fh)) {
+        $line .= fgets($fh, 4096);  // read full line
+        if(substr($line,-1) != "\n") continue;
+
+        // check if line matches
+        if(preg_match($pattern,$line,$match)){
+            if($backref){
+                $matches[] = $match;
+            }else{
+                $matches[] = $line;
+            }
+            $cnt++;
+        }
+        if($max && $max == $cnt) break;
+        $line = '';
+    }
+    fclose($fh);
+    return $matches;
+}
+