lib/functions.php

   1 <?php
   2 /*
   3  *  Jirafeau, your web file repository
   4  *  Copyright (C) 2008  Julien "axolotl" BERNARD <axolotl@magieeternelle.org>
   5  *  Copyright (C) 2015  Jerome Jutteau <jerome@jutteau.fr>
   6  *  Copyright (C) 2015  Nicola Spanti (RyDroid) <dev@nicola-spanti.info>
   7  *
   8  *  This program is free software: you can redistribute it and/or modify
   9  *  it under the terms of the GNU Affero General Public License as
  10  *  published by the Free Software Foundation, either version 3 of the
  11  *  License, or (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU Affero General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU Affero General Public License
  19  *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
  20  */
  21
  22 /**
  23  * Transform a string in a path by separating each letters by a '/'.
  24  * @return path finishing with a '/'
  25  */
  26 function s2p($s)
  27 {
  28     $block_size = 8;
  29     $p = '';
  30     for ($i = 0; $i < strlen($s); $i++) {
  31         $p .= $s[$i];
  32         if (($i + 1) % $block_size == 0) {
  33             $p .= '/';
  34         }
  35     }
  36     if (strlen($s) % $block_size != 0) {
  37         $p .= '/';
  38     }
  39     return $p;
  40 }
  41
  42 /**
  43  * Convert base 16 to base 64
  44  * @returns A string based on 64 characters (0-9, a-z, A-Z, "-" and "_")
  45  */
  46 function base_16_to_64($num)
  47 {
  48     $m = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_';
  49     $hex2bin = array('0000',  # 0
  50                       '0001',  # 1
  51                       '0010',  # 2
  52                       '0011',  # 3
  53                       '0100',  # 4
  54                       '0101',  # 5
  55                       '0110',  # 6
  56                       '0111',  # 7
  57                       '1000',  # 8
  58                       '1001',  # 9
  59                       '1010',  # a
  60                       '1011',  # b
  61                       '1100',  # c
  62                       '1101',  # d
  63                       '1110',  # e
  64                       '1111'); # f
  65     $o = '';
  66     $b = '';
  67     $i = 0;
  68     # Convert long hex string to bin.
  69     $size = strlen($num);
  70     for ($i = 0; $i < $size; $i++) {
  71         $b .= $hex2bin[hexdec($num[$i])];
  72     }
  73     # Convert long bin to base 64.
  74     $size *= 4;
  75     for ($i = $size - 6; $i >= 0; $i -= 6) {
  76         $o = $m[bindec(substr($b, $i, 6))] . $o;
  77     }
  78     # Some few bits remaining ?
  79     if ($i < 0 && $i > -6) {
  80         $o = $m[bindec(substr($b, 0, $i + 6))] . $o;
  81     }
  82     return $o;
  83 }
  84
  85 /**
  86   * Generate a random code.
  87   * @param $l code length
  88   * @return  random code.
  89   */
  90 function jirafeau_gen_random($l)
  91 {
  92     if ($l <= 0) {
  93         return 42;
  94     }
  95
  96     $code="";
  97     for ($i = 0; $i < $l; $i++) {
  98         $code .= dechex(rand(0, 15));
  99     }
 100
 101     return $code;
 102 }
 103
 104 function is_ssl()
 105 {
 106     if (isset($_SERVER['HTTPS'])) {
 107         if ('on' == strtolower($_SERVER['HTTPS']) ||
 108              '1' == $_SERVER['HTTPS']) {
 109             return true;
 110         }
 111     } elseif (isset($_SERVER['SERVER_PORT']) && ('443' == $_SERVER['SERVER_PORT'])) {
 112         return true;
 113     } elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
 114         if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
 115             return true;
 116         }
 117     }
 118     return false;
 119 }
 120
 121 function jirafeau_human_size($octets)
 122 {
 123     $u = array('B', 'KB', 'MB', 'GB', 'TB');
 124     $o = max($octets, 0);
 125     $p = min(floor(($o ? log($o) : 0) / log(1024)), count($u) - 1);
 126     $o /= pow(1024, $p);
 127     return round($o, 1) . $u[$p];
 128 }
 129
 130 // Convert UTC timestamp to a datetime field
 131 function jirafeau_get_datetimefield($timestamp)
 132 {
 133     $content = '<span class="datetime" data-datetime="' . strftime('%Y-%m-%d %H:%M', $timestamp) . '">'
 134         . strftime('%Y-%m-%d %H:%M', $timestamp) . ' (GMT)</span>';
 135     return $content;
 136 }
 137
 138 function jirafeau_fatal_error($errorText, $cfg = array())
 139 {
 140     echo '<div class="error"><h2>Error</h2><p>' . $errorText . '</p></div>';
 141     require(JIRAFEAU_ROOT . 'lib/template/footer.php');
 142     exit;
 143 }
 144
 145 function jirafeau_clean_rm_link($link)
 146 {
 147     $p = s2p("$link");
 148     if (file_exists(VAR_LINKS . $p . $link)) {
 149         unlink(VAR_LINKS . $p . $link);
 150     }
 151     $parse = VAR_LINKS . $p;
 152     $scan = array();
 153     while (file_exists($parse)
 154            && ($scan = scandir($parse))
 155            && count($scan) == 2 // '.' and '..' folders => empty.
 156            && basename($parse) != basename(VAR_LINKS)) {
 157         rmdir($parse);
 158         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 159     }
 160 }
 161
 162 function jirafeau_clean_rm_file($hash)
 163 {
 164     $p = s2p("$hash");
 165     $f = VAR_FILES . $p . $hash;
 166     if (file_exists($f) && is_file($f)) {
 167         unlink($f);
 168     }
 169     if (file_exists($f . '_count') && is_file($f . '_count')) {
 170         unlink($f . '_count');
 171     }
 172     $parse = VAR_FILES . $p;
 173     $scan = array();
 174     while (file_exists($parse)
 175            && ($scan = scandir($parse))
 176            && count($scan) == 2 // '.' and '..' folders => empty.
 177            && basename($parse) != basename(VAR_FILES)) {
 178         rmdir($parse);
 179         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 180     }
 181 }
 182
 183 /**
 184  * transforms a php.ini string representing a value in an integer
 185  * @param $value the value from php.ini
 186  * @returns an integer for this value
 187  */
 188 function jirafeau_ini_to_bytes($value)
 189 {
 190     $modifier = substr($value, -1);
 191     $bytes = substr($value, 0, -1);
 192     switch (strtoupper($modifier)) {
 193     case 'P':
 194         $bytes *= 1024;
 195         // no break
 196     case 'T':
 197         $bytes *= 1024;
 198         // no break
 199     case 'G':
 200         $bytes *= 1024;
 201         // no break
 202     case 'M':
 203         $bytes *= 1024;
 204         // no break
 205     case 'K':
 206         $bytes *= 1024;
 207     }
 208     return $bytes;
 209 }
 210
 211 /**
 212  * gets the maximum upload size according to php.ini
 213  * @returns the maximum upload size in bytes
 214  */
 215 function jirafeau_get_max_upload_size_bytes()
 216 {
 217     return min(
 218         jirafeau_ini_to_bytes(ini_get('post_max_size')),
 219         jirafeau_ini_to_bytes(ini_get('upload_max_filesize'))
 220     );
 221 }
 222
 223 /**
 224  * gets the maximum upload size according to php.ini
 225  * @returns the maximum upload size string
 226  */
 227 function jirafeau_get_max_upload_size()
 228 {
 229     return jirafeau_human_size(jirafeau_get_max_upload_size_bytes());
 230 }
 231
 232 /**
 233  * gets a string explaining the error
 234  * @param $code the error code
 235  * @returns a string explaining the error
 236  */
 237 function jirafeau_upload_errstr($code)
 238 {
 239     switch ($code) {
 240     case UPLOAD_ERR_INI_SIZE:
 241     case UPLOAD_ERR_FORM_SIZE:
 242         return t('Your file exceeds the maximum authorized file size. ');
 243
 244     case UPLOAD_ERR_PARTIAL:
 245     case UPLOAD_ERR_NO_FILE:
 246         return
 247             t('Your file was not uploaded correctly. You may succeed in retrying. ');
 248
 249     case UPLOAD_ERR_NO_TMP_DIR:
 250     case UPLOAD_ERR_CANT_WRITE:
 251     case UPLOAD_ERR_EXTENSION:
 252         return t('Internal error. You may not succeed in retrying. ');
 253     }
 254     return t('Unknown error. ');
 255 }
 256
 257 /** Remove link and it's file
 258  * @param $link the link's name (hash)
 259  */
 260
 261 function jirafeau_delete_link($link)
 262 {
 263     $l = jirafeau_get_link($link);
 264     if (!count($l)) {
 265         return;
 266     }
 267
 268     jirafeau_clean_rm_link($link);
 269
 270     $hash = $l['hash'];
 271     $p = s2p("$hash");
 272
 273     $counter = 1;
 274     if (file_exists(VAR_FILES . $p . $hash. '_count')) {
 275         $content = file(VAR_FILES . $p . $hash. '_count');
 276         $counter = trim($content[0]);
 277     }
 278     $counter--;
 279
 280     if ($counter >= 1) {
 281         $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 282         fwrite($handle, $counter);
 283         fclose($handle);
 284     }
 285
 286     if ($counter == 0) {
 287         jirafeau_clean_rm_file($hash);
 288     }
 289 }
 290
 291 /**
 292  * Delete a file and it's links.
 293  */
 294 function jirafeau_delete_file($hash)
 295 {
 296     $count = 0;
 297     /* Get all links files. */
 298     $stack = array(VAR_LINKS);
 299     while (($d = array_shift($stack)) && $d != null) {
 300         $dir = scandir($d);
 301
 302         foreach ($dir as $node) {
 303             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 304                 preg_match('/\.tmp/i', "$node")) {
 305                 continue;
 306             }
 307
 308             if (is_dir($d . $node)) {
 309                 /* Push new found directory. */
 310                 $stack[] = $d . $node . '/';
 311             } elseif (is_file($d . $node)) {
 312                 /* Read link informations. */
 313                 $l = jirafeau_get_link(basename($node));
 314                 if (!count($l)) {
 315                     continue;
 316                 }
 317                 if ($l['hash'] == $hash) {
 318                     $count++;
 319                     jirafeau_delete_link($node);
 320                 }
 321             }
 322         }
 323     }
 324     jirafeau_clean_rm_file($hash);
 325     return $count;
 326 }
 327
 328
 329 /** hash file's content
 330  * @param $method hash method, see 'file_hash' option. Valid methods are 'md5', 'md5_outside' or 'random'
 331  * @param $file_path file to hash
 332  * @returns hash string
 333  */
 334 function jirafeau_hash_file($method, $file_path)
 335 {
 336     switch ($method) {
 337         case 'md5_outside':
 338             return jirafeau_md5_outside($file_path);
 339         case 'md5':
 340             return md5_file($file_path);
 341         case 'random':
 342             return jirafeau_gen_random(32);
 343     }
 344     return md5_file($file_path);
 345 }
 346
 347 /** hash part of file: start, end and size.
 348  * This is a partial file hash, faster but weaker.
 349  * @param $file_path file to hash
 350  * @returns hash string
 351  */
 352 function jirafeau_md5_outside($file_path)
 353 {
 354     $out = false;
 355     $handle = fopen($file_path, "r");
 356     if ($handle === false) {
 357         return false;
 358     }
 359     $size = filesize($file_path);
 360     if ($size === false) {
 361         goto err;
 362     }
 363     $first = fread($handle, 64);
 364     if ($first === false) {
 365         goto err;
 366     }
 367     if (fseek($handle, $size < 64 ? 0 : $size - 64) == -1) {
 368         goto err;
 369     }
 370     $last = fread($handle, 64);
 371     if ($last === false) {
 372         goto err;
 373     }
 374     $out = md5($first . $last . $size);
 375     err:
 376     fclose($handle);
 377     return $out;
 378 }
 379
 380 /**
 381  * handles an uploaded file
 382  * @param $file the file struct given by $_FILE[]
 383  * @param $one_time_download is the file a one time download ?
 384  * @param $key if not empty, protect the file with this key
 385  * @param $time the time of validity of the file
 386  * @param $ip uploader's ip
 387  * @param $crypt boolean asking to crypt or not
 388  * @param $link_name_length size of the link name
 389  * @returns an array containing some information
 390  *   'error' => information on possible errors
 391  *   'link' => the link name of the uploaded file
 392  *   'delete_link' => the link code to delete file
 393  */
 394 function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $link_name_length, $file_hash_method)
 395 {
 396     if (empty($file['tmp_name']) || !is_uploaded_file($file['tmp_name'])) {
 397         return (array(
 398                  'error' =>
 399                    array('has_error' => true,
 400                           'why' => jirafeau_upload_errstr($file['error'])),
 401                  'link' => '',
 402                  'delete_link' => ''));
 403     }
 404
 405     /* array representing no error */
 406     $noerr = array('has_error' => false, 'why' => '');
 407
 408     /* Crypt file if option is enabled. */
 409     $crypted = false;
 410     $crypt_key = '';
 411     if ($crypt == true && !(extension_loaded('mcrypt') == true)) {
 412         error_log("PHP extension mcrypt not loaded, won't encrypt in Jirafeau");
 413     }
 414     if ($crypt == true && extension_loaded('mcrypt') == true) {
 415         $crypt_key = jirafeau_encrypt_file($file['tmp_name'], $file['tmp_name']);
 416         if (strlen($crypt_key) > 0) {
 417             $crypted = true;
 418         }
 419     }
 420
 421     /* file information */
 422     $hash = jirafeau_hash_file($file_hash_method, $file['tmp_name']);
 423     $name = str_replace(NL, '', trim($file['name']));
 424     $mime_type = $file['type'];
 425     $size = $file['size'];
 426
 427     /* does file already exist ? */
 428     $rc = false;
 429     $p = s2p("$hash");
 430     if (file_exists(VAR_FILES . $p .  $hash)) {
 431         $rc = unlink($file['tmp_name']);
 432     } elseif ((file_exists(VAR_FILES . $p) || @mkdir(VAR_FILES . $p, 0755, true))
 433             && move_uploaded_file($file['tmp_name'], VAR_FILES . $p . $hash)) {
 434         $rc = true;
 435     }
 436     if (!$rc) {
 437         return (array(
 438                  'error' =>
 439                    array('has_error' => true,
 440                           'why' => t('INTERNAL_ERROR_DEL')),
 441                  'link' =>'',
 442                  'delete_link' => ''));
 443     }
 444
 445     /* Increment or create count file. */
 446     $counter = 0;
 447     if (file_exists(VAR_FILES . $p . $hash . '_count')) {
 448         $content = file(VAR_FILES . $p . $hash. '_count');
 449         $counter = trim($content[0]);
 450     }
 451     $counter++;
 452     $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 453     fwrite($handle, $counter);
 454     fclose($handle);
 455
 456     /* Create delete code. */
 457     $delete_link_code = jirafeau_gen_random(5);
 458
 459     /* hash password or empty. */
 460     $password = '';
 461     if (!empty($key)) {
 462         $password = md5($key);
 463     }
 464
 465     /* create link file */
 466     $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
 467     $handle = fopen($link_tmp_name, 'w');
 468     fwrite(
 469         $handle,
 470         $name . NL. $mime_type . NL. $size . NL. $password . NL. $time .
 471             NL . $hash. NL . ($one_time_download ? 'O' : 'R') . NL . time() .
 472             NL . $ip . NL. $delete_link_code . NL . ($crypted ? 'C' : 'O')
 473     );
 474     fclose($handle);
 475     $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 476     $l = s2p("$hash_link");
 477     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 478         !rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
 479         if (file_exists($link_tmp_name)) {
 480             unlink($link_tmp_name);
 481         }
 482
 483         $counter--;
 484         if ($counter >= 1) {
 485             $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 486             fwrite($handle, $counter);
 487             fclose($handle);
 488         } else {
 489             jirafeau_clean_rm_file($hash_link);
 490         }
 491         return array(
 492                  'error' =>
 493                    array('has_error' => true,
 494                           'why' => t('Internal error during file creation. ')),
 495                  'link' =>'',
 496                  'delete_link' => '');
 497     }
 498     return array( 'error' => $noerr,
 499                   'link' => $hash_link,
 500                   'delete_link' => $delete_link_code,
 501                   'crypt_key' => $crypt_key);
 502 }
 503
 504 /**
 505  * Tells if a mime-type is viewable in a browser
 506  * @param $mime the mime type
 507  * @returns a boolean telling if a mime type is viewable
 508  */
 509 function jirafeau_is_viewable($mime)
 510 {
 511     if (!empty($mime)) {
 512         $viewable = array('image', 'video', 'audio');
 513         $decomposed = explode('/', $mime);
 514         if (in_array($decomposed[0], $viewable) && strpos($mime, 'image/svg+xml') === false) {
 515             return true;
 516         }
 517         $viewable = array('text/plain');
 518         if (in_array($mime, $viewable)) {
 519             return true;
 520         }
 521     }
 522     return false;
 523 }
 524
 525 // Error handling functions.
 526 //! Global array that contains all registered errors.
 527 $error_list = array();
 528
 529 /**
 530  * Adds an error to the list of errors.
 531  * @param $title the error's title
 532  * @param $description is a human-friendly description of the problem.
 533  */
 534 function add_error($title, $description)
 535 {
 536     global $error_list;
 537     $error_list[] = '<p>' . $title. '<br />' . $description. '</p>';
 538 }
 539
 540 /**
 541  * Informs whether any error has been registered yet.
 542  * @return true if there are errors.
 543  */
 544 function has_error()
 545 {
 546     global $error_list;
 547     return !empty($error_list);
 548 }
 549
 550 /**
 551  * Displays all the errors.
 552  */
 553 function show_errors()
 554 {
 555     if (has_error()) {
 556         global $error_list;
 557         echo '<div class="error">';
 558         foreach ($error_list as $error) {
 559             echo $error;
 560         }
 561         echo '</div>';
 562     }
 563 }
 564
 565 function check_errors($cfg)
 566 {
 567     if (file_exists(JIRAFEAU_ROOT . 'install.php')
 568         && !($cfg['installation_done'] === true)) {
 569         header('Location: install.php');
 570         exit;
 571     }
 572
 573     /* Checking for errors. */
 574     if (!is_writable(VAR_FILES)) {
 575         add_error(t('FILE_DIR_W'), VAR_FILES);
 576     }
 577
 578     if (!is_writable(VAR_LINKS)) {
 579         add_error(t('LINK_DIR_W'), VAR_LINKS);
 580     }
 581
 582     if (!is_writable(VAR_ASYNC)) {
 583         add_error(t('ASYNC_DIR_W'), VAR_ASYNC);
 584     }
 585
 586     if ($cfg['enable_crypt'] && $cfg['litespeed_workaround']) {
 587         add_error(t('INCOMPATIBLE_OPTIONS_W'), 'enable_crypt=true<br>litespeed_workaround=true');
 588     }
 589
 590     if ($cfg['one_time_download'] && $cfg['litespeed_workaround']) {
 591         add_error(t('INCOMPATIBLE_OPTIONS_W'), 'one_time_download=true<br>litespeed_workaround=true');
 592     }
 593 }
 594
 595 /**
 596  * Read link information
 597  * @return array containing information.
 598  */
 599 function jirafeau_get_link($hash)
 600 {
 601     $out = array();
 602     $link = VAR_LINKS . s2p("$hash") . $hash;
 603
 604     if (!file_exists($link)) {
 605         return $out;
 606     }
 607
 608     $c = file($link);
 609     $out['file_name'] = trim($c[0]);
 610     $out['mime_type'] = trim($c[1]);
 611     $out['file_size'] = trim($c[2]);
 612     $out['key'] = trim($c[3], NL);
 613     $out['time'] = trim($c[4]);
 614     $out['hash'] = trim($c[5]);
 615     $out['onetime'] = trim($c[6]);
 616     $out['upload_date'] = trim($c[7]);
 617     $out['ip'] = trim($c[8]);
 618     $out['link_code'] = trim($c[9]);
 619     $out['crypted'] = trim($c[10]) == 'C';
 620
 621     return $out;
 622 }
 623
 624 /**
 625  * List files in admin interface.
 626  */
 627 function jirafeau_admin_list($name, $file_hash, $link_hash)
 628 {
 629     echo '<fieldset><legend>';
 630     if (!empty($name)) {
 631         echo t('FILENAME') . ": " . jirafeau_escape($name);
 632     }
 633     if (!empty($file_hash)) {
 634         echo t('FILE') . ": " . jirafeau_escape($file_hash);
 635     }
 636     if (!empty($link_hash)) {
 637         echo t('LINK') . ": " . jirafeau_escape($link_hash);
 638     }
 639     if (empty($name) && empty($file_hash) && empty($link_hash)) {
 640         echo t('LS_FILES');
 641     }
 642     echo '</legend>';
 643     echo '<table>';
 644     echo '<tr>';
 645     echo '<th></th>';
 646     echo '<th>' . t('ACTION') . '</th>';
 647     echo '</tr>';
 648
 649     /* Get all links files. */
 650     $stack = array(VAR_LINKS);
 651     while (($d = array_shift($stack)) && $d != null) {
 652         $dir = scandir($d);
 653         foreach ($dir as $node) {
 654             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 655                 preg_match('/\.tmp/i', "$node")) {
 656                 continue;
 657             }
 658             if (is_dir($d . $node)) {
 659                 /* Push new found directory. */
 660                 $stack[] = $d . $node . '/';
 661             } elseif (is_file($d . $node)) {
 662                 /* Read link information. */
 663                 $l = jirafeau_get_link($node);
 664                 if (!count($l)) {
 665                     continue;
 666                 }
 667
 668                 /* Filter. */
 669                 if (!empty($name) && !@preg_match("/$name/i", jirafeau_escape($l['file_name']))) {
 670                     continue;
 671                 }
 672                 if (!empty($file_hash) && $file_hash != $l['hash']) {
 673                     continue;
 674                 }
 675                 if (!empty($link_hash) && $link_hash != $node) {
 676                     continue;
 677                 }
 678                 /* Print link information. */
 679                 echo '<tr>';
 680                 echo '<td>' .
 681                 '<strong><a id="upload_link" href="f.php?h='. jirafeau_escape($node) .'" title="' .
 682                     t('DL_PAGE') . '">' . jirafeau_escape($l['file_name']) . '</a></strong><br/>';
 683                 echo t('TYPE') . ': ' . jirafeau_escape($l['mime_type']) . '<br/>';
 684                 echo t('SIZE') . ': ' . jirafeau_human_size($l['file_size']) . '<br>';
 685                 echo t('EXPIRE') . ': ' . ($l['time'] == -1 ? '∞' : jirafeau_get_datetimefield($l['time'])) . '<br/>';
 686                 echo t('ONETIME') . ': ' . ($l['onetime'] == 'O' ? 'Yes' : 'No') . '<br/>';
 687                 echo t('UPLOAD_DATE') . ': ' . jirafeau_get_datetimefield($l['upload_date']) . '<br/>';
 688                 if (strlen($l['ip']) > 0) {
 689                     echo t('ORIGIN') . ': ' . $l['ip'] . '<br/>';
 690                 }
 691                 echo '</td><td>';
 692                 echo '<form method="post">' .
 693                 '<input type = "hidden" name = "action" value = "download"/>' .
 694                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 695                 jirafeau_admin_csrf_field() .
 696                 '<input type = "submit" value = "' . t('DL') . '" />' .
 697                 '</form>' .
 698                 '<form method="post">' .
 699                 '<input type = "hidden" name = "action" value = "delete_link"/>' .
 700                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 701                 jirafeau_admin_csrf_field() .
 702                 '<input type = "submit" value = "' . t('DEL_LINK') . '" />' .
 703                 '</form>' .
 704                 '<form method="post">' .
 705                 '<input type = "hidden" name = "action" value = "delete_file"/>' .
 706                 '<input type = "hidden" name = "hash" value = "' . $l['hash'] . '"/>' .
 707                 jirafeau_admin_csrf_field() .
 708                 '<input type = "submit" value = "' . t('DEL_FILE_LINKS') . '" />' .
 709                 '</form>' .
 710                 '</td>';
 711                 echo '</tr>';
 712             }
 713         }
 714     }
 715     echo '</table></fieldset>';
 716 }
 717
 718 /**
 719  * Clean expired files.
 720  * @return number of cleaned files.
 721  */
 722 function jirafeau_admin_clean()
 723 {
 724     $count = 0;
 725     /* Get all links files. */
 726     $stack = array(VAR_LINKS);
 727     while (($d = array_shift($stack)) && $d != null) {
 728         $dir = scandir($d);
 729
 730         foreach ($dir as $node) {
 731             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 732                 preg_match('/\.tmp/i', "$node")) {
 733                 continue;
 734             }
 735
 736             if (is_dir($d . $node)) {
 737                 /* Push new found directory. */
 738                 $stack[] = $d . $node . '/';
 739             } elseif (is_file($d . $node)) {
 740                 /* Read link information. */
 741                 $l = jirafeau_get_link(basename($node));
 742                 if (!count($l)) {
 743                     continue;
 744                 }
 745                 $p = s2p($l['hash']);
 746                 if ($l['time'] > 0 && $l['time'] < time() || // expired
 747                     !file_exists(VAR_FILES . $p . $l['hash']) || // invalid
 748                     !file_exists(VAR_FILES . $p . $l['hash'] . '_count')) { // invalid
 749                     jirafeau_delete_link($node);
 750                     $count++;
 751                 }
 752             }
 753         }
 754     }
 755     return $count;
 756 }
 757
 758
 759 /**
 760  * Clean old async transfers.
 761  * @return number of cleaned files.
 762  */
 763 function jirafeau_admin_clean_async()
 764 {
 765     $count = 0;
 766     /* Get all links files. */
 767     $stack = array(VAR_ASYNC);
 768     while (($d = array_shift($stack)) && $d != null) {
 769         $dir = scandir($d);
 770
 771         foreach ($dir as $node) {
 772             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 773                 preg_match('/\.tmp/i', "$node")) {
 774                 continue;
 775             }
 776
 777             if (is_dir($d . $node)) {
 778                 /* Push new found directory. */
 779                 $stack[] = $d . $node . '/';
 780             } elseif (is_file($d . $node)) {
 781                 /* Read async information. */
 782                 $a = jirafeau_get_async_ref(basename($node));
 783                 if (!count($a)) {
 784                     continue;
 785                 }
 786                 /* Delete transfers older than 1 hour. */
 787                 if (time() - $a['last_edited'] > 3600) {
 788                     jirafeau_async_delete(basename($node));
 789                     $count++;
 790                 }
 791             }
 792         }
 793     }
 794     return $count;
 795 }
 796
 797 /**
 798  * Better strval function for debug purposes
 799  */
 800 function jirafeau_strval($value)
 801 {
 802     if (gettype($value) == "boolean") {
 803         return $value ? 'true' : 'false';
 804     }
 805     return strval($value);
 806 }
 807
 808 /**
 809  * Show file/folder permissions
 810  */
 811 function jirafeau_fileperms($path)
 812 {
 813     $out = substr(sprintf("%o", @fileperms($path)), -4) . ", ";
 814     $out .= "read " . (is_readable($path) ? "OK" : "KO") . ", ";
 815     $out .= "write " . (is_writable($path) ? "OK" : "KO");
 816     return $out;
 817 }
 818
 819 /**
 820  * Show some useful informations for bug reporting.
 821  */
 822 function jirafeau_admin_bug_report($cfg)
 823 {
 824     $out = "<fieldset><legend>" . t('REPORTING_AN_ISSUE') . "</legend>";
 825     $out .= "If you have a problem related to Jirafeau, please <a href='https://gitlab.com/mojo42/Jirafeau/-/issues'>open an issue</a>, explain your problem in english and copy-paste the following content:<br/><br/><code>";
 826
 827     $out .= "# Jirafeau<br/>";
 828     $out .= "- version: " . JIRAFEAU_VERSION . "<br/>";
 829     $jirafeau_options = [
 830         'debug',
 831         'file_hash',
 832         'litespeed_workaround',
 833         'store_uploader_ip',
 834         'installation_done',
 835         'enable_crypt',
 836         'preview',
 837         'maximal_upload_size',
 838         'store_uploader_ip'
 839     ];
 840     foreach ($jirafeau_options as &$o) {
 841         $v = $cfg[$o];
 842         $out .= "- $o: " . jirafeau_strval($v) . " (" . gettype($v) . ")<br/>";
 843     }
 844     $out .= "<br/>";
 845
 846     $out .= "# PHP options<br/>";
 847     $out .= "- php version: " . phpversion() . "<br/>";
 848     $out .= "- mcrypt version: " . phpversion('mcrypt') . "<br/>";
 849     $php_options =  [
 850         'post_max_size',
 851         'upload_max_filesize',
 852         'safe_mode',
 853         'max_execution_time',
 854         'max_input_time'
 855     ];
 856     foreach ($php_options as &$o) {
 857         $v = ini_get($o);
 858         $out .= "- $o: " . jirafeau_strval($v) . " (" . gettype($v). ")<br/>";
 859     }
 860     $out .= "- can set_time_limit: " . (set_time_limit(0) ? "yes" : "no") . "<br/>";
 861     $out .= "<br/>";
 862
 863     $out .= "# File permissions<br/>";
 864     $out .= "- 'var' folder permissions: " . jirafeau_fileperms($cfg['var_root']) . "<br/>";
 865     $out .= "- 'file' folder permissions: " . jirafeau_fileperms(VAR_FILES) . "<br/>";
 866     $out .= "- 'links' folder permissions: " . jirafeau_fileperms(VAR_LINKS) . "<br/>";
 867     $out .= "- 'async' folder permissions: " . jirafeau_fileperms(VAR_ASYNC) . "<br/>";
 868     $out .= "<br/>";
 869
 870     $out .= "# Server details<br/>";
 871     $out .= "- server software: " . $_SERVER["SERVER_SOFTWARE"] . "<br/>";
 872     $out .= "<br/>";
 873
 874     $out .= "# OS details<br/>";
 875     $out .= "- OS: " . php_uname() . "<br/>";
 876     $out .= "<br/>";
 877
 878     $out .= "# Browser details<br/>";
 879     $out .= "<script type='text/javascript' lang='Javascript'>
 880         // @license magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt AGPL-v3-or-Later
 881         document.write('- html5 support: ' + (check_html5_file_api() ? 'yes' : 'no') + '<br/>');
 882         document.write('- user agent: ' + navigator.userAgent + '<br/>');
 883         // @license-end
 884         </script>";
 885     $out .= "<br/>";
 886
 887     $out .= "# Memory<br/>";
 888     $out .= "- memory_get_peak_usage: " . jirafeau_human_size(memory_get_peak_usage()) . "<br/>";
 889
 890     $out .= "</code></fieldset>";
 891     return $out;
 892 }
 893
 894 /**
 895  * Read async transfer information
 896  * @return array containing information.
 897  */
 898 function jirafeau_get_async_ref($ref)
 899 {
 900     $out = array();
 901     $refinfos = VAR_ASYNC . s2p("$ref") . "$ref";
 902
 903     if (!file_exists($refinfos)) {
 904         return $out;
 905     }
 906
 907     $c = file($refinfos);
 908     $out['file_name'] = trim($c[0]);
 909     $out['mime_type'] = trim($c[1]);
 910     $out['key'] = trim($c[2], NL);
 911     $out['time'] = trim($c[3]);
 912     $out['onetime'] = trim($c[4]);
 913     $out['ip'] = trim($c[5]);
 914     $out['last_edited'] = trim($c[6]);
 915     $out['next_code'] = trim($c[7]);
 916     return $out;
 917 }
 918
 919 /**
 920  * Delete async transfer information
 921  */
 922 function jirafeau_async_delete($ref)
 923 {
 924     $p = s2p("$ref");
 925     if (file_exists(VAR_ASYNC . $p . $ref)) {
 926         unlink(VAR_ASYNC . $p . $ref);
 927     }
 928     if (file_exists(VAR_ASYNC . $p . $ref . '_data')) {
 929         unlink(VAR_ASYNC . $p . $ref . '_data');
 930     }
 931     $parse = VAR_ASYNC . $p;
 932     $scan = array();
 933     while (file_exists($parse)
 934            && ($scan = scandir($parse))
 935            && count($scan) == 2 // '.' and '..' folders => empty.
 936            && basename($parse) != basename(VAR_ASYNC)) {
 937         rmdir($parse);
 938         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 939     }
 940 }
 941
 942 /**
 943   * Init a new asynchronous upload.
 944   * @param $filename Name of the file to send
 945   * @param $one_time One time upload parameter
 946   * @param $key eventual password (or blank)
 947   * @param $time time limit
 948   * @param $ip ip address of the client
 949   * @return a string containing a temporary reference followed by a code or a string starting with 'Error'
 950   */
 951 function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
 952 {
 953     /* Create temporary folder. */
 954     $ref;
 955     $p;
 956     $code = jirafeau_gen_random(4);
 957     do {
 958         $ref = jirafeau_gen_random(32);
 959         $p = VAR_ASYNC . s2p($ref);
 960     } while (file_exists($p));
 961     @mkdir($p, 0755, true);
 962     if (!file_exists($p)) {
 963         return 'Error: cannot create async folder.';
 964     }
 965
 966     /* touch empty data file */
 967     $w_path = $p . $ref . '_data';
 968     touch($w_path);
 969
 970     /* md5 password or empty */
 971     $password = '';
 972     if (!empty($key)) {
 973         $password = md5($key);
 974     }
 975
 976     /* Store information. */
 977     $p .= $ref;
 978     $handle = fopen($p, 'w');
 979     fwrite(
 980         $handle,
 981         str_replace(NL, '', trim($filename)) . NL .
 982             str_replace(NL, '', trim($type)) . NL . $password . NL .
 983             $time . NL . ($one_time ? 'O' : 'R') . NL . $ip . NL .
 984             time() . NL . $code . NL
 985     );
 986     fclose($handle);
 987
 988     return $ref . NL . $code ;
 989 }
 990
 991 /**
 992   * Append a piece of file on the asynchronous upload.
 993   * @param $ref asynchronous upload reference
 994   * @param $file piece of data
 995   * @param $code client code for this operation
 996   * @param $max_file_size maximum allowed file size
 997   * @return a string containing a next code to use or a string starting with 'Error'
 998   */
 999 function jirafeau_async_push($ref, $data, $code, $max_file_size)
1000 {
1001     /* Get async infos. */
1002     $a = jirafeau_get_async_ref($ref);
1003
1004     /* Check some errors. */
1005     if (count($a) == 0) {
1006         return "Error: cannot find transfer";
1007     }
1008     if ($a['next_code'] != "$code") {
1009         return "Error: bad transfer code";
1010     }
1011     if ($data['error'] != UPLOAD_ERR_OK) {
1012         // Check error code in https://www.php.net/manual/en/features.file-upload.errors.php
1013         $data_details = print_r($data, true);
1014         return "Error: upload error: {$data_details}";
1015     }
1016     if (empty($data['tmp_name'])) {
1017         return "Error: missing tmp_name";
1018     }
1019     if (!is_uploaded_file($data['tmp_name'])) {
1020         return "Error: tmp_name may not be uploaded";
1021     }
1022
1023     $p = s2p($ref);
1024
1025     /* File path. */
1026     $r_path = $data['tmp_name'];
1027     $w_path = VAR_ASYNC . $p . $ref . '_data';
1028
1029     /* Check that file size is not above upload limit. */
1030     if ($max_file_size > 0 &&
1031         filesize($r_path) + filesize($w_path) > $max_file_size * 1024 * 1024) {
1032         jirafeau_async_delete($ref);
1033         return "Error: file size is above upload limit";
1034     }
1035
1036     /* Concatenate data. */
1037     $r = fopen($r_path, 'r');
1038     $w = fopen($w_path, 'a');
1039     while (!feof($r)) {
1040         if (fwrite($w, fread($r, 1024)) === false) {
1041             fclose($r);
1042             fclose($w);
1043             jirafeau_async_delete($ref);
1044             return "Error: cannot write file";
1045         }
1046     }
1047     fclose($r);
1048     fclose($w);
1049     unlink($r_path);
1050
1051     /* Update async file. */
1052     $code = jirafeau_gen_random(4);
1053     $handle = fopen(VAR_ASYNC . $p . $ref, 'w');
1054     fwrite(
1055         $handle,
1056         $a['file_name'] . NL. $a['mime_type'] . NL. $a['key'] . NL .
1057             $a['time'] . NL . $a['onetime'] . NL . $a['ip'] . NL .
1058             time() . NL . $code . NL
1059     );
1060     fclose($handle);
1061     return $code;
1062 }
1063
1064 /**
1065   * Finalize an asynchronous upload.
1066   * @param $ref asynchronous upload reference
1067   * @param $code client code for this operation
1068   * @param $crypt boolean asking to crypt or not
1069   * @param $link_name_length link name length
1070   * @return a string containing the download reference followed by a delete code or a string starting with 'Error'
1071   */
1072 function jirafeau_async_end($ref, $code, $crypt, $link_name_length, $file_hash_method)
1073 {
1074     /* Get async infos. */
1075     $a = jirafeau_get_async_ref($ref);
1076     if (count($a) == 0
1077         || $a['next_code'] != "$code") {
1078         return "Error: bad code for ending transfer";
1079     }
1080
1081     /* Generate link infos. */
1082     $p = VAR_ASYNC . s2p($ref) . $ref . "_data";
1083     if (!file_exists($p)) {
1084         return "Error: referenced file does not exist";
1085     }
1086
1087     $crypted = false;
1088     $crypt_key = '';
1089     if ($crypt == true && extension_loaded('mcrypt') == true) {
1090         $crypt_key = jirafeau_encrypt_file($p, $p);
1091         if (strlen($crypt_key) > 0) {
1092             $crypted = true;
1093         }
1094     }
1095
1096     $hash = jirafeau_hash_file($file_hash_method, $p);
1097     $size = filesize($p);
1098     $np = s2p($hash);
1099     $delete_link_code = jirafeau_gen_random(5);
1100
1101     /* File already exist ? */
1102     if (!file_exists(VAR_FILES . $np)) {
1103         @mkdir(VAR_FILES . $np, 0755, true);
1104     }
1105     if (!file_exists(VAR_FILES . $np . $hash)) {
1106         rename($p, VAR_FILES . $np . $hash);
1107     }
1108
1109     /* Increment or create count file. */
1110     $counter = 0;
1111     if (file_exists(VAR_FILES . $np . $hash . '_count')) {
1112         $content = file(VAR_FILES . $np . $hash. '_count');
1113         $counter = trim($content[0]);
1114     }
1115     $counter++;
1116     $handle = fopen(VAR_FILES . $np . $hash. '_count', 'w');
1117     fwrite($handle, $counter);
1118     fclose($handle);
1119
1120     /* Create link. */
1121     $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
1122     $handle = fopen($link_tmp_name, 'w');
1123     fwrite(
1124         $handle,
1125         $a['file_name'] . NL . $a['mime_type'] . NL . $size . NL .
1126             $a['key'] . NL . $a['time'] . NL . $hash . NL . $a['onetime'] . NL .
1127             time() . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C' : 'O')
1128     );
1129     fclose($handle);
1130     $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
1131     $l = s2p("$hash_link");
1132     if (!@mkdir(VAR_LINKS . $l, 0755, true)) {
1133         return "Error: cannot create folder in LINKS";
1134     }
1135     if (!rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
1136         return "Error: cannot rename file in LINKS";
1137     }
1138
1139     /* Clean async upload. */
1140     jirafeau_async_delete($ref);
1141     return $hash_link . NL . $delete_link_code . NL . urlencode($crypt_key);
1142 }
1143
1144 function jirafeau_crypt_create_iv($base, $size)
1145 {
1146     $iv = '';
1147     while (strlen($iv) < $size) {
1148         $iv = $iv . $base;
1149     }
1150     $iv = substr($iv, 0, $size);
1151     return $iv;
1152 }
1153
1154 /**
1155  * Crypt file and returns decrypt key.
1156  * @param $fp_src file path to the file to crypt.
1157  * @param $fp_dst file path to the file to write crypted file (could be the same).
1158  * @return decrypt key composed of the key and the iv separated by a point ('.')
1159  */
1160 function jirafeau_encrypt_file($fp_src, $fp_dst)
1161 {
1162     $fs = filesize($fp_src);
1163     if ($fs === false || $fs == 0 || !(extension_loaded('mcrypt') == true)) {
1164         return '';
1165     }
1166
1167     /* Prepare module. */
1168     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1169     /* Generate key. */
1170     $crypt_key = jirafeau_gen_random(10);
1171     $hash_key = md5($crypt_key);
1172     $iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
1173     /* Init module. */
1174     mcrypt_generic_init($m, $hash_key, $iv);
1175     /* Crypt file. */
1176     $r = fopen($fp_src, 'r');
1177     $w = fopen($fp_dst, 'c');
1178     while (!feof($r)) {
1179         $enc = mcrypt_generic($m, fread($r, 1024));
1180         if (fwrite($w, $enc) === false) {
1181             return '';
1182         }
1183     }
1184     fclose($r);
1185     fclose($w);
1186     /* Cleanup. */
1187     mcrypt_generic_deinit($m);
1188     mcrypt_module_close($m);
1189     return $crypt_key;
1190 }
1191
1192 /**
1193  * Decrypt file.
1194  * @param $fp_src file path to the file to decrypt.
1195  * @param $fp_dst file path to the file to write decrypted file (could be the same).
1196  * @param $k string composed of the key and the iv separated by a point ('.')
1197  * @return key used to decrypt. a string of length 0 is returned if failed.
1198  */
1199 function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
1200 {
1201     $fs = filesize($fp_src);
1202     if ($fs === false || $fs == 0 || extension_loaded('mcrypt') == false) {
1203         return false;
1204     }
1205
1206     /* Init module */
1207     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1208     /* Extract key and iv. */
1209     $crypt_key = $k;
1210     $hash_key = md5($crypt_key);
1211     $iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
1212     /* Decrypt file. */
1213     $r = fopen($fp_src, 'r');
1214     $w = fopen($fp_dst, 'c');
1215     while (!feof($r)) {
1216         $dec = mdecrypt_generic($m, fread($r, 1024));
1217         if (fwrite($w, $dec) === false) {
1218             return false;
1219         }
1220     }
1221     fclose($r);
1222     fclose($w);
1223     /* Cleanup. */
1224     mcrypt_generic_deinit($m);
1225     mcrypt_module_close($m);
1226     return true;
1227 }
1228
1229 /**
1230  * Check if Jirafeau is password protected for visitors.
1231  * @return true if Jirafeau is password protected, false otherwise.
1232  */
1233 function jirafeau_has_upload_password($cfg)
1234 {
1235     return count($cfg['upload_password']) > 0;
1236 }
1237
1238 /**
1239  * Challenge password for a visitor.
1240  * @param $password password to be challenged
1241  * @return true if password is valid, false otherwise.
1242  */
1243 function jirafeau_challenge_upload_password($cfg, $password)
1244 {
1245     if (!jirafeau_has_upload_password($cfg)) {
1246         return false;
1247     }
1248     foreach ($cfg['upload_password'] as $p) {
1249         if ($password == $p) {
1250             return true;
1251         }
1252     }
1253     return false;
1254 }
1255
1256 /**
1257  * Test if the given IP is whitelisted by the given list.
1258  *
1259  * @param $allowedIpList array of allowed IPs
1260  * @param $challengedIp IP to be challenged
1261  * @return true if IP is authorized, false otherwise.
1262  */
1263 function jirafeau_challenge_ip($allowedIpList, $challengedIp)
1264 {
1265     foreach ($allowedIpList as $i) {
1266         if ($i == $challengedIp) {
1267             return true;
1268         }
1269         // CIDR test for IPv4 only.
1270         if (strpos($i, '/') !== false) {
1271             list($subnet, $mask) = explode('/', $i);
1272             if ((ip2long($challengedIp) & ~((1 << (32 - $mask)) - 1)) == ip2long($subnet)) {
1273                 return true;
1274             }
1275         }
1276     }
1277     return false;
1278 }
1279
1280 /**
1281  * Check if Jirafeau has a restriction on the IP address for uploading.
1282  * @return true if uploading is IP restricted, false otherwise.
1283  */
1284 function jirafeau_upload_has_ip_restriction($cfg)
1285 {
1286     return count($cfg['upload_ip']) > 0;
1287 }
1288
1289 /**
1290  * Test if visitor's IP is authorized to upload at all.
1291  *
1292  * @param $cfg configuration
1293  * @param $challengedIp IP to be challenged
1294  * @return true if IP is authorized, false otherwise.
1295  */
1296 function jirafeau_challenge_upload_ip($cfg, $challengedIp)
1297 {
1298     // If no IP address have been listed, allow upload from any IP
1299     if (!jirafeau_upload_has_ip_restriction($cfg)) {
1300         return true;
1301     }
1302     return jirafeau_challenge_ip($cfg['upload_ip'], $challengedIp);
1303 }
1304
1305 /**
1306  * Test if visitor's IP is authorized to upload without a password.
1307  *
1308  * @param $cfg configuration
1309  * @param $challengedIp IP to be challenged
1310  * @return true if IP is authorized, false otherwise.
1311  */
1312 function jirafeau_challenge_upload_ip_without_password($cfg, $challengedIp)
1313 {
1314     return jirafeau_challenge_ip($cfg['upload_ip_nopassword'], $challengedIp);
1315 }
1316
1317 /**
1318  * Test if visitor's IP is authorized or password is supplied and authorized
1319  * @param $ip IP to be challenged
1320  * @param $password password to be challenged
1321  * @return true if access is valid, false otherwise.
1322  */
1323 function jirafeau_challenge_upload($cfg, $ip, $password)
1324 {
1325     return jirafeau_challenge_upload_ip_without_password($cfg, $ip) ||
1326             (!jirafeau_has_upload_password($cfg) && !jirafeau_upload_has_ip_restriction($cfg)) ||
1327             (jirafeau_challenge_upload_password($cfg, $password) && jirafeau_challenge_upload_ip($cfg, $ip));
1328 }
1329
1330 /** Tell if we have some HTTP headers generated by a proxy */
1331 function has_http_forwarded()
1332 {
1333     return
1334         !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ||
1335         !empty($_SERVER['http_X_forwarded_for']);
1336 }
1337
1338 /**
1339  * Generate IP list from HTTP headers generated by a proxy
1340  * @return  array of IP strings
1341  */
1342 function get_ip_list_http_forwarded()
1343 {
1344     $ip_list = array();
1345     if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
1346         $l = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
1347         if ($l === false) {
1348             return array();
1349         }
1350         foreach ($l as $ip) {
1351             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1352         }
1353     }
1354     if (!empty($_SERVER['http_X_forwarded_for'])) {
1355         $l = explode(',', $_SERVER['http_X_forwarded_for']);
1356         foreach ($l as $ip) {
1357             // Separate IP from port
1358             $ipa = explode(':', $ip);
1359             if ($ipa === false) {
1360                 continue;
1361             }
1362             $ip = $ipa[0];
1363             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1364         }
1365     }
1366     return $ip_list;
1367 }
1368
1369 /**
1370  * Get the ip address of the client from REMOTE_ADDR
1371  * or from HTTP_X_FORWARDED_FOR if behind a proxy
1372  * @returns the client ip address
1373  */
1374 function get_ip_address($cfg)
1375 {
1376     $remote = $_SERVER['REMOTE_ADDR'];
1377     if (count($cfg['proxy_ip']) == 0 || !has_http_forwarded()) {
1378         return $remote;
1379     }
1380
1381     $ip_list = get_ip_list_http_forwarded();
1382     if (count($ip_list) == 0) {
1383         return $remote;
1384     }
1385
1386     foreach ($cfg['proxy_ip'] as $proxy_ip) {
1387         if ($remote != $proxy_ip) {
1388             continue;
1389         }
1390         // Take the last IP (the one which has been set by the defined proxy).
1391         return end($ip_list);
1392     }
1393     return $remote;
1394 }
1395
1396 /**
1397  * Convert hexadecimal string to base64
1398  */
1399 function hex_to_base64($hex)
1400 {
1401     $b = '';
1402     foreach (str_split($hex, 2) as $pair) {
1403         $b .= chr(hexdec($pair));
1404     }
1405     return base64_encode($b);
1406 }
1407
1408 /**
1409  * Replace markers in templates.
1410  *
1411  * Available markers have the scheme "###MARKERNAME###".
1412  *
1413  * @param $content string Template text with markers
1414  * @param $htmllinebreaks boolean Convert linebreaks to BR-Tags
1415  * @return Template with replaced markers
1416  */
1417 function jirafeau_replace_markers($content, $htmllinebreaks = false)
1418 {
1419     $patterns = array(
1420         '/###ORGANISATION###/',
1421         '/###CONTACTPERSON###/',
1422         '/###WEBROOT###/'
1423     );
1424     $replacements = array(
1425         $GLOBALS['cfg']['organisation'],
1426         $GLOBALS['cfg']['contactperson'],
1427         $GLOBALS['cfg']['web_root']
1428     );
1429     $content = preg_replace($patterns, $replacements, $content);
1430
1431     if (true === $htmllinebreaks) {
1432         $content = nl2br($content);
1433     }
1434
1435     return $content;
1436 }
1437
1438 function jirafeau_escape($string)
1439 {
1440     return htmlspecialchars($string, ENT_QUOTES);
1441 }
1442
1443 function jirafeau_admin_session_start()
1444 {
1445     $_SESSION['admin_auth'] = true;
1446     $_SESSION['admin_csrf'] = md5(uniqid(mt_rand(), true));
1447 }
1448
1449 function jirafeau_admin_session_end()
1450 {
1451     $_SESSION = array();
1452     session_destroy();
1453 }
1454
1455 function jirafeau_admin_session_logged()
1456 {
1457     return isset($_SESSION['admin_auth']) &&
1458            isset($_SESSION['admin_csrf']) &&
1459            isset($_POST['admin_csrf']) &&
1460            $_SESSION['admin_auth'] === true &&
1461            $_SESSION['admin_csrf'] === $_POST['admin_csrf'];
1462 }
1463
1464 function jirafeau_admin_csrf_field()
1465 {
1466     return "<input type='hidden' name='admin_csrf' value='". $_SESSION['admin_csrf'] . "'/>";
1467 }
1468
1469 function jirafeau_dir_size($dir)
1470 {
1471     $size = 0;
1472     foreach (glob(rtrim($dir, '/').'/*', GLOB_NOSORT) as $entry) {
1473         $size += is_file($entry) ? filesize($entry) : jirafeau_dir_size($entry);
1474     }
1475     return $size;
1476 }
1477
1478 function jirafeau_export_cfg($cfg)
1479 {
1480     $content = '<?php' . NL;
1481     $content .= '/* This file was generated by the install process. ' .
1482                'You can edit it. Please see config.original.php to understand the ' .
1483                'configuration items. */' . NL;
1484     $content .= '$cfg = ' . var_export($cfg, true) . ';';
1485
1486     $fileWrite = file_put_contents(JIRAFEAU_CFG, $content);
1487
1488     if (false === $fileWrite) {
1489         jirafeau_fatal_error(t('Can not write local configuration file'));
1490     }
1491 }
1492
1493 function jirafeau_mkdir($path)
1494 {
1495     return !(!file_exists($path) && !@mkdir($path, 0755));
1496 }
1497
1498 /**
1499  * Returns true whether the path is writable or we manage to make it
1500  * so, which essentially is the same thing.
1501  * @param $path is the file or directory to be tested.
1502  * @return true if $path is writable.
1503  */
1504 function jirafeau_is_writable($path)
1505 {
1506     /* "@" gets rid of error messages. */
1507     return is_writable($path) || @chmod($path, 0777);
1508 }
1509
1510 function jirafeau_check_var_dir($path)
1511 {
1512     $mkdir_str1 = t('CANNOT_CREATE_DIR') . ':';
1513     $mkdir_str2 = t('MANUAL_CREATE');
1514     $write_str1 = t('DIR_NOT_W') . ':';
1515     $write_str2 = t('You should give the write permission to the web server on ' .
1516                     'this directory.');
1517     $solution_str = t('HERE_SOLUTION') . ':';
1518
1519     if (!jirafeau_mkdir($path) || !jirafeau_is_writable($path)) {
1520         return array('has_error' => true,
1521                       'why' => $mkdir_str1 . '<br /><code>' .
1522                                $path . '</code><br />' . $solution_str .
1523                                '<br />' . $mkdir_str2);
1524     }
1525
1526     foreach (array('files', 'links', 'async') as $subdir) {
1527         $subpath = $path.$subdir;
1528
1529         if (!jirafeau_mkdir($subpath) || !jirafeau_is_writable($subpath)) {
1530             return array('has_error' => true,
1531                           'why' => $mkdir_str1 . '<br /><code>' .
1532                                    $subpath . '</code><br />' . $solution_str .
1533                                    '<br />' . $mkdir_str2);
1534         }
1535     }
1536
1537     return array('has_error' => false, 'why' => '');
1538 }
1539
1540 function jirafeau_add_ending_slash($path)
1541 {
1542     return $path . ((substr($path, -1) == '/') ? '' : '/');
1543 }
1544
1545 function jirafeau_default_web_root()
1546 {
1547     return $_SERVER['HTTP_HOST'] . str_replace(basename(__FILE__), '', $_SERVER['REQUEST_URI']);
1548 }