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system.php
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system.php
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<?php
// Konfiguration laden
if(!file_exists('config.php')) {
die('<!DOCTYPE HTML><head><meta charset="utf-8"><title>Fehler</title></head>
<body><h1>Konfiguration fehlt</h1><p>Bitte lege eine Konfigurationsdatei <em>config.php</em> an. Hierzu
kannst Du die Vorlage aus <em>config.php.sample</em> verwenden.</p></body>');
}
require('config.php');
// Flags für User, gespeichert in user()->flags
define('USER_FLAG_WANTSMAIL', 1);
// Stripslashes {{{
function stripslashes_deep(&$value)
{
$value = is_array($value) ?
array_map('stripslashes_deep', $value) :
stripslashes($value);
return $value;
}
if( (function_exists("get_magic_quotes_gpc") && get_magic_quotes_gpc())
|| (ini_get('magic_quotes_sybase') && (strtolower(ini_get('magic_quotes_sybase')) != "off")))
{
stripslashes_deep($_GET);
stripslashes_deep($_POST);
stripslashes_deep($_COOKIE);
}
// }}}
// Datenbankverbindung herstellen {{{
try {
$driver_options = array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8');
$database = new PDO($database_conn[0], $database_conn[1], $database_conn[2], $driver_options);
$database->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(Exception $error) {
?><!DOCTYPE HTML><head><title>Fehler</title><meta charset="utf-8"></head><body><h1>Datenbankfehler</h1>
<p>Eine Datenbankverbindung konnte nicht hergestellt werden. Fehler:
<em><?=htmlspecialchars($error->getMessage())?></em>
</p>
<p>Bitte kontaktiere den Support!</p>
</body>
<?php
die();
}
if($init_database) {
// Tabellen anlegen
$database->beginTransaction();
if($database->getAttribute(PDO::ATTR_DRIVER_NAME) == 'sqlite') {
$database->exec('CREATE TABLE users (id INTEGER PRIMARY KEY AUTOINCREMENT, name VARCHAR(50),
pass VARCHAR(40), salt VARCHAR(2) DEFAULT "", level INT DEFAULT 0, flags INTEGER DEFAULT 0,
settings LONGTEXT DEFAULT "a:0:{}");');
$database->exec('CREATE TABLE user_autologin (id VARCHAR(40), token VARCHAR(40), user_id INTEGER)');
$database->exec('CREATE INDEX uauto ON user_autologin (id)');
$database->exec('CREATE INDEX user ON user_autologin (user_id)');
$database->exec('CREATE TABLE feeds (id INTEGER PRIMARY KEY AUTOINCREMENT, owner INT, desc VARCHAR(120), short VARCHAR(120),
code LONGTEXT, public INT DEFAULT 0, update_timestamp INT);');
$database->query('CREATE TABLE feed_links (feed_id INTEGER, title VARCHAR(120), url TEXT, PRIMARY KEY (feed_id, title));');
$database->exec('CREATE TABLE data (id INTEGER PRIMARY KEY AUTOINCREMENT, feed_id INTEGER,
data MEDIUMTEXT, timestamp INT(11))');
$database->exec('CREATE INDEX fid ON data (feed_id);');
$database->exec('CREATE TABLE user_data (data_id INTEGER, user_id INTEGER, comment MEDIUMTEXT DEFAULT "", invisible INTEGER DEFAULT 0, known INTEGER DEFAULT 0);');
$database->exec('CREATE UNIQUE INDEX did_uid ON user_data (data_id, user_id);');
$database->exec('CREATE TABLE user_feeds (user_id INTEGER, feed_id INTEGER);');
$database->exec('CREATE INDEX uid ON user_feeds (user_id);');
$database->exec('CREATE UNIQUE INDEX uid_feed ON user_feeds (user_id, feed_id);');
$database->exec('CREATE TABLE suggestions (id INTEGER PRIMARY KEY AUTOINCREMENT, user_id INTEGER, text MEDIUMTEXT);');
$database->exec('CREATE TABLE url_age_cache (url MEDIUMTEXT, age INTEGER)');
}
else {
$database->exec('CREATE TABLE users (id INTEGER PRIMARY KEY AUTO_INCREMENT, name VARCHAR(50),
pass VARCHAR(40), salt VARCHAR(2) DEFAULT "", level INT DEFAULT 0, flags INTEGER DEFAULT 0, settings LONGTEXT) DEFAULT CHARSET=utf8;');
$database->exec('CREATE TABLE user_autologin (id VARCHAR(40), token VARCHAR(40), user_id INTEGER) DEFAULT CHARSET=utf8');
$database->exec('CREATE INDEX uauto ON user_autologin (id)');
$database->exec('CREATE INDEX user ON user_autologin (user_id)');
$database->exec('CREATE TABLE feeds (id INTEGER PRIMARY KEY AUTO_INCREMENT, owner INTEGER, `desc` VARCHAR(120), short VARCHAR(120),
code LONGTEXT, public INTEGER DEFAULT 0, update_timestamp INT, course_url VARCHAR(255)
DEFAULT CHARSET=utf8;');
$database->query('CREATE TABLE feed_links (feed_id INTEGER, title VARCHAR(120), url TEXT, PRIMARY KEY (feed_id, title))
DEFAULT CHARSET=utf8;');
$database->exec('CREATE TABLE data (id INTEGER PRIMARY KEY AUTO_INCREMENT, feed_id INTEGER,
data MEDIUMTEXT, timestamp INT(11)) DEFAULT CHARSET=utf8');
$database->exec('CREATE INDEX fid ON data (feed_id);');
$database->exec('CREATE TABLE user_data (data_id INTEGER, user_id INTEGER, comment MEDIUMTEXT DEFAULT "", invisible INTEGER DEFAULT 0, known INTEGER DEFAULT 0) DEFAULT CHARSET=utf8;');
$database->exec('CREATE UNIQUE INDEX did_uid ON user_data (data_id, user_id);');
$database->exec('CREATE TABLE user_feeds (user_id INTEGER, feed_id INTEGER) DEFAULT CHARSET=utf8;');
$database->exec('CREATE INDEX uid ON user_feeds (user_id);');
$database->exec('CREATE TABLE suggestions (id INTEGER PRIMARY KEY AUTO_INCREMENT, user_id INTEGER, text MEDIUMTEXT) DEFAULT CHARSET=utf8;');
$database->exec('CREATE TABLE url_age_cache (url MEDIUMTEXT, age INTEGER) DEFAULT CHARSET=utf8');
}
$salt = base_convert(rand(0, 36*36 - 1), 10, 36);
$database->exec('INSERT INTO users (id, name, pass, level, salt) VALUES (1, "admin", "d033e22ae348aeb5660fc2140aec35850c4da997", 2, "' . $salt . '");');
$database->commit();
$database = null;
die("Datenbank angelegt. Der Standardbenutzer ist admin mit Passwort admin.");
}
// }}}
// Hilfsfunktionen {{{
function status_message($text, $user = null) {
// Statusmeldungen werden bei der Seitenausgabe in ein
// Div geschrieben.
if($user === null) {
$_SESSION['status_messages'][] = $text;
}
else {
$store_user = false;
if(!is_object($user)) {
$store_user = true;
$user = user_load('id', $user);
if(!$user) return;
}
if(!isset($user->saved_status_messages)) {
$user->saved_status_messages = array();
}
$user->saved_status_messages[] = $text;
if($store_user) {
user_save($user);
}
}
}
function gotop($url) {
if(isset($_REQUEST['destination']) && $_REQUEST['destination'] && !preg_match('#^[a-z]+:#i', $_REQUEST['destination'])) {
$url = $_REQUEST['destination'];
}
header('Location: '.$url);
die();
}
// Benutzerverwaltung {{{
function user_levels() {
return array(
0 => 'Benutzer',
1 => 'Moderator',
2 => 'Administrator',
);
}
session_start();
function logged_in() {
return $_SESSION['logged_in'] === true;
}
function force_login() {
if(!logged_in()) gotop("index.php?q=login&destination=" . urlencode($_SERVER['REQUEST_URI']));
}
function force_level($level) {
force_login();
if(user()->level < $level) {
header('HTTP/1.1 403 Access denied');
echo('<div id="error">Deine Berechtigungen erlauben Dir nicht, diese Seite zu sehen</div>');
return false;
}
return true;
}
function &user() {
static $user;
if(!$user) {
if(logged_in()) {
$user = &$_SESSION['login'];
}
else {
$user = new stdclass();
$user->id = 0;
$user->settings = array();
$user->flags = 0;
$user->name = "Gast";
$user->level = 0;
}
}
return $user;
}
function user_load($key, $value) {
global $database;
$query = $database->prepare('SELECT * FROM users WHERE '.$key.' = ?');
$query->execute(array($value));
$user = $query->fetch(PDO::FETCH_OBJ);
if(!$user) return false;
$settings_array = unserialize($user->settings);
if(is_array($settings_array)) {
foreach($settings_array as $key => $value) {
if(!isset($user->$key)) {
$user->$key = $value;
}
}
}
return $user;
}
function user_save($user = null) {
global $database;
if(!$user) $user = user();
$settings = array();
foreach($user as $key => $val) {
if(array_search($key, array('id', 'name', 'pass', 'salt', 'level', 'flags', 'settings')) === false) {
$settings[$key] = $val;
}
}
if(user()->id) {
$stmt = $database->prepare('UPDATE users SET name = ?, pass = ?, salt = ?, level = ?, flags = ?,
settings = ? WHERE id = ?');
$stmt->execute(array($user->name, $user->pass, $user->salt, $user->level, $user->flags, serialize($settings),
$user->id));
}
else {
$user = user();
$stmt = $database->prepare('INSERT INTO users (name, pass, salt, level, flags, settings) VALUES (?, ?, ?, ?, ?, ?)');
$stmt->execute(array($user->name, $user->pass, $user->salt, $user->level, $user->flags, serialize($settings)));
$user->id = $database->lastInsertId();
}
}
// }}}
class tmpfile_manager {/*{{{*/
private $file;
public function __construct() {
$this->file = tempnam("/tmp", "tmp");
}
public function __destruct() {
unlink($this->file);
}
public function __toString() {
return $this->file;
}
}/*}}}*/
function admin_log($text) {/*{{{*/
// Log von Administrator-Aufgaben
// Vorallem für PHP-Ausführung wichtig
if(!$GLOBALS['admin_log_file']) return;
$log_file = fopen($GLOBALS['admin_log_file'], 'a');
flock($log_file, LOCK_EX);
fwrite($log_file, "[".date('d.m.Y H:i:s')." ".user()->name."] ".$text."\n");
fclose($log_file);
}/*}}}*/
function remove_authentication_from_urls($data) { /*{{{*/
// Funktion zum entfernen von Authentifizierungsinformationen aus URLs
global $remove_authentication_for_viewing;
if(isset($remove_authentication_for_viewing) && $remove_authentication_for_viewing) {
return preg_replace('#(http|ftp)://([^:/]+?):[^/]*?[^\\\\]@(\S+)#i', '$1://$2@$3', $data);
}
else {
return $data;
}
}/*}}}*/
function get_mime_type($fileOrInline, $inline = false) {/*{{{*/
$type = false;
if(!$inline && !file_exists($fileOrInline)) return false;
if(class_exists('finfo')) {
$finfo = new finfo(FILEINFO_MIME, "/usr/share/misc/magic");
$type = $inline ? $finfo->buffer($fileOrInline) : $finfo->file($fileOrInline);
}
else {
in_shell_execution(true);
if($inline && function_exists('proc_open')) {
$fo = proc_open("file -b --mime-type -", array(0 => array("pipe", "r"), 1 => array("pipe", "w")), $pipes);
fwrite($pipes[0], $fileOrInline);
fclose($pipes[0]);
$type = trim(stream_get_contents($pipes[1]));
fclose($pipes[1]);
proc_close($fo);
}
elseif(!$inline && function_exists('popen')) {
$type = trim(stream_get_contents(popen("file -b --mime-type ".escapeshellarg($fileOrInline), "r")));
}
in_shell_execution(false);
}
return $type;
}/*}}}*/
function check_if_url_changed($url, $store_update = true) {/*{{{*/
// Prüft, ob sich eine URL seit dem letzten Aufruf verändert
// hat. Gibt true zurück, wenn ja oder wenn die URL noch nie
// aufgerufen wurde.
global $database;
$query = $database->prepare('SELECT age FROM url_age_cache WHERE url = ?');
$query->execute(array($url));
$db_age = $query->fetchColumn();
$cookie_file = &$GLOBALS['_system_cookie_file'];
if(!$cookie_file) $cookie_file = new tmpfile_manager();
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_COOKIEJAR, $cookie_file);
curl_setopt($curl, CURLOPT_COOKIEFILE, $cookie_file);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($curl, CURLOPT_TIMEOUT, 20);
curl_setopt($curl, CURLOPT_HEADER, 1);
curl_setopt($curl, CURLOPT_NOBODY, 1);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$headers = curl_exec($curl);
if(curl_getinfo($curl, CURLINFO_HTTP_CODE) >= 400 || curl_errno($curl) != 0) {
throw new Exception("Die URL konnte nicht geladen werden: " . curl_error($curl));
}
$current_age = curl_getinfo($curl, CURLINFO_FILETIME);
if($current_age == -1 && preg_match('#^Last-Modified: (.+)#mi', $headers, $matches)) {
$current_age = strtotime($matches[1]);
}
if($current_age == -1) return true;
if($db_age && $db_age == $current_age) return false;
if(!$store_update) return true;
if($db_age) {
$query = $database->prepare('UPDATE url_age_cache SET age = ? WHERE url = ?');
}
else {
$query = $database->prepare('INSERT INTO url_age_cache (age, url) VALUES (?, ?)');
}
$query->execute(array($current_age, $url));
return true;
}/*}}}*/
function load_url($url, $fix_encoding = true, $if_modified_since = false) {/*{{{*/
$cookie_file = &$GLOBALS['_system_cookie_file'];
if(!$cookie_file) $cookie_file = new tmpfile_manager();
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_COOKIEJAR, $cookie_file);
curl_setopt($curl, CURLOPT_COOKIEFILE, $cookie_file);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($curl, CURLOPT_TIMEOUT, 20);
if($if_modified_since !== false) {
curl_setopt($curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
curl_setopt($curl, CURLOPT_TIMEVALUE, $if_modified_since);
}
$content = curl_exec($curl);
if($if_modified_since !== false) {
if(curl_getinfo($curl, CURLINFO_HTTP_CODE) == 304) return true; // Not modified
}
if(curl_getinfo($curl, CURLINFO_HTTP_CODE) >= 400 || curl_errno($curl) != 0 || !$content) {
throw new Exception("Die URL konnte nicht geladen werden: " . curl_error($curl));
}
curl_close($curl);
if(strlen($content) > $GLOBALS['allowed_cache_file_size']) {
throw new Exception("Datei zu groß. Dateien über " . round($GLOBALS['allowed_cache_file_size'] / 1024 / 1024) .
"Mb Größe können aus Sicherheitsgründen nicht heruntergeladen werden.");
}
$type = get_mime_type($content, true);
if(preg_match('/^[^;]+/', $type, $match)) $type = $match[0];
if(array_search($type, $GLOBALS['allowed_cache_types']) === false) {
throw new Exception("Dateityp unbekannt. Aus Sicherheitsgründen können nur bestimmte Dateitypen heruntergeladen werden.");
}
if(!$fix_encoding) return $content;
return mb_convert_encoding($content, 'UTF-8',
mb_detect_encoding($content, 'UTF-8, ISO-8859-1', true));
}/*}}}*/
function is_mobile() {/*{{{*/
if(preg_match('/SymbianOS|J2ME|Mobile|iPhone|iPad|iPod|android|opera mini|blackberry|windows ce/i', $_SERVER['HTTP_USER_AGENT'])) return true;
return false;
}/*}}}*/
function split_data($data) {/*{{{*/
// Eine Übung aufteilen in URL und Text
if(preg_match('#^(https?://[^ ]+)( .+)?$#is', $data, $match)) {
return array($match[1], trim($match[2]));
}
else {
return array('', $data);
}
}/*}}}*/
function format_data($data, $id = null) {/*{{{*/
list($url, $text) = split_data($data);
if($url) {
// Mobile Device PDF: Das können wir als JPG ausliefern!
if($id && preg_match('/\.(?:pdf|ps)$/i', $url) && is_mobile()) {
$url = 'image.php?data_id='.htmlspecialchars($id);
}
if($id && $GLOBALS['cache_everything']) {
return '<a class="exercise" href="cache.php?data_id=' . htmlspecialchars($id) . '">'.htmlspecialchars($text ? $text : basename($url)).'</a>';
}
else {
$url = remove_authentication_from_urls($url);
return '<a class="exercise" href="'.htmlspecialchars($url).'">'.htmlspecialchars($text ? $text : basename($url)).'</a>';
}
}
else {
return htmlspecialchars($text);
}
}/*}}}*/
function cache_file($url, $file_name = false, $return_id = false, $safeForDeletion = true) {/*{{{*/
$cache_id = sha1($url);
if(!$safeForDeletion) $cache_id = 'st_'.$cache_id;
$cache_file = $GLOBALS['cache_dir'] . '/' . $cache_id;
$directory = dirname($_SERVER['REQUEST_URI']); if(substr($directory, -1) != '/') $directory .= '/';
$cache_url = 'http' . (isset($_SERVER['HTTPS']) ? 's' : '') . '://' . $_SERVER['SERVER_NAME'] . $directory .
'cache.php?cache_id=' . $cache_id . '&filename=' . ($file_name === false ? $cache_id : $file_name);
$cache_exists = file_exists($cache_file);
$content = load_url($url, false, $cache_exists ? filemtime($cache_file) : false);
if($content && $content !== true) {
// Nur den Cache neu schreiben, wenn sich tatsächlich etwas verändert hat
// Dadurch verhindern wir, dass Zettel immer wieder als „Neu“ zählen, weil
// ein Webserver schlampig konfiguriert ist.
if(!file_exists($cache_file) || sha1_file($cache_file) != sha1($content)) {
file_put_contents($cache_file, $content);
}
}
if($return_id) return $cache_id;
return $cache_url;
}/*}}}*/
function cache_contents($url) {/*{{{*/
$cache_id = cache_file($url, false, true, true);
return file_get_contents($GLOBALS['cache_dir'] . $cache_id);
}/*}}}*/
function cache_zip_file_contents($url, $identifier = null) { /*{{{*/
if($identifier === null) $identifier = $url;
$cache_id = cache_file($url, false, true, true);
$retval = array();
$directory = dirname($_SERVER['REQUEST_URI']); if(substr($directory, -1) != '/') $directory .= '/';
$zip = new ZipArchive;
if(!$zip->open($GLOBALS['cache_dir'] . '/' . $cache_id)) {
throw new Execption("Failed to open ZIP archive from $url");
}
for($i=0; $i<$zip->numFiles; $i++) {
$file_name = basename($zip->getNameIndex($i));
if(isset($retval[$file_name])) {
$n = 0;
while(isset($retval[$n . '~' . $file_name])) $n++;
$file_name = $n . '~' . $file_name;
}
$content = $zip->getFromIndex($i);
$cache_id = sha1($identifier . '#' . $file_name);
$cache_file = $GLOBALS['cache_dir'] . '/' . $cache_id;
$cache_url = 'http' . (isset($_SERVER['HTTPS']) ? 's' : '') . '://' . $_SERVER['SERVER_NAME'] . $directory .
'cache.php?cache_id=' . $cache_id . '&filename=' . $file_name;
$cache_exists = file_exists($cache_file);
if($content) {
// Nur den Cache neu schreiben, wenn sich tatsächlich etwas verändert hat
// Dadurch verhindern wir, dass Zettel immer wieder als „Neu“ zählen, weil
// ein Webserver schlampig konfiguriert ist.
if(!file_exists($cache_file) || sha1_file($cache_file) != sha1($content)) {
file_put_contents($cache_file, $content);
}
}
$retval[$file_name] = $cache_url . ' ' . $file_name;
}
return $retval;
} /*}}}*/
function in_shell_execution($begin) {/*{{{*/
// Benutzt, falls möglich, die Semaphore-Implementation von
// PHP, um die maximale Anzahl gleichzeitiger Shell-Invocations
// zu regulieren
if(!function_exists('sem_get')) return;
// Für den Cron-Job soll keine Beschränkung gelten, denn der muss ja
// ausgeführt werden
if(basename($_SERVER['PHP_SELF']) == "cron.php") return;
// Ansonsten entsprechend der Konfiguration aussperren
global $_active_semaphore;
if(!$_active_semaphore) {
$id = ftok(__FILE__, 'v');
$_active_semaphore = sem_get($id, $GLOBALS['max_concurrent_toolkit_invokations'], 0666, 1);
}
if($begin) {
ignore_user_abort(true);
set_time_limit(30);
sem_acquire($_active_semaphore);
}
else {
ignore_user_abort(false);
sem_release($_active_semaphore);
}
}/*}}}*/
// }}}
// Angepasste Helfer-Funktionen für eine bestimmte Installation
// Ist online sichtbar, vorallem praktisch, um Hilfsfunktionen für
// Zettel zu definieren.
if(file_exists('local.php')) {
include('local.php');
}