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 $code;
 102 }
 103
 104 function jirafeau_gen_download_pass($length, $allowed_chars)
 105 {
 106     if ($length <= 0) {
 107         return false;
 108     }
 109     $pass="";
 110     for ($i = 0; $i < $length; $i++) {
 111         $pass .= $allowed_chars[rand(0, strlen($allowed_chars) - 1)];
 112     }
 113
 114     return $pass;
 115 }
 116
 117 function is_ssl()
 118 {
 119     if (isset($_SERVER['HTTPS'])) {
 120         if ('on' == strtolower($_SERVER['HTTPS']) ||
 121              '1' == $_SERVER['HTTPS']) {
 122             return true;
 123         }
 124     } elseif (isset($_SERVER['SERVER_PORT']) && ('443' == $_SERVER['SERVER_PORT'])) {
 125         return true;
 126     } elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
 127         if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
 128             return true;
 129         }
 130     }
 131     return false;
 132 }
 133
 134 function jirafeau_human_size($octets)
 135 {
 136     $u = array('B', 'KB', 'MB', 'GB', 'TB');
 137     $o = max($octets, 0);
 138     $p = min(floor(($o ? log($o) : 0) / log(1024)), count($u) - 1);
 139     $o /= pow(1024, $p);
 140     return round($o, 1) . $u[$p];
 141 }
 142
 143 // Convert UTC timestamp to a datetime field
 144 function jirafeau_get_datetimefield($timestamp)
 145 {
 146
 147     $ts = date_create("@" . $timestamp);
 148     $content = '<span class="datetime" data-datetime="' . date_format($ts, 'Y-m-d H:i') . '">'
 149         . date_format($ts, 'Y-m-d H:i') . ' (GMT)</span>';
 150
 151     return $content;
 152 }
 153
 154 function jirafeau_fatal_error($errorText, $cfg = array())
 155 {
 156     echo '<div class="error"><h2>Error</h2><p>' . $errorText . '</p></div>';
 157     require(JIRAFEAU_ROOT . 'lib/template/footer.php');
 158     exit;
 159 }
 160
 161 function jirafeau_clean_rm_link($link)
 162 {
 163     $p = s2p("$link");
 164     if (file_exists(VAR_LINKS . $p . $link)) {
 165         unlink(VAR_LINKS . $p . $link);
 166     }
 167     if (file_exists(VAR_LINKS . $p . $link . '_download')) {
 168         unlink(VAR_LINKS . $p . $link . '_download');
 169     }
 170     $parse = VAR_LINKS . $p;
 171     $scan = array();
 172     while (file_exists($parse)
 173            && ($scan = scandir($parse))
 174            && count($scan) == 2 // '.' and '..' folders => empty.
 175            && basename($parse) != basename(VAR_LINKS)) {
 176         rmdir($parse);
 177         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 178     }
 179 }
 180
 181 function jirafeau_clean_rm_file($hash)
 182 {
 183     $p = s2p("$hash");
 184     $f = VAR_FILES . $p . $hash;
 185     if (file_exists($f) && is_file($f)) {
 186         unlink($f);
 187     }
 188     if (file_exists($f . '_count') && is_file($f . '_count')) {
 189         unlink($f . '_count');
 190     }
 191     $parse = VAR_FILES . $p;
 192     $scan = array();
 193     while (file_exists($parse)
 194            && ($scan = scandir($parse))
 195            && count($scan) == 2 // '.' and '..' folders => empty.
 196            && basename($parse) != basename(VAR_FILES)) {
 197         rmdir($parse);
 198         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 199     }
 200 }
 201
 202 /**
 203  * transforms a php.ini string representing a value in an integer
 204  * @param $value the value from php.ini
 205  * @returns an integer for this value
 206  */
 207 function jirafeau_ini_to_bytes($value)
 208 {
 209     $modifier = substr($value, -1);
 210     $bytes = substr($value, 0, -1);
 211     switch (strtoupper($modifier)) {
 212         default:
 213             return intval($value);
 214             break;
 215         case 'P':
 216             $bytes *= 1024;
 217             // no break
 218         case 'T':
 219             $bytes *= 1024;
 220             // no break
 221         case 'G':
 222             $bytes *= 1024;
 223             // no break
 224         case 'M':
 225             $bytes *= 1024;
 226             // no break
 227         case 'K':
 228             $bytes *= 1024;
 229     }
 230     return $bytes;
 231 }
 232
 233 /**
 234  * gets the maximum upload size according to php.ini
 235  * @returns the maximum upload size in bytes
 236  */
 237 function jirafeau_get_max_upload_size_bytes()
 238 {
 239     return min(
 240         jirafeau_ini_to_bytes(ini_get('post_max_size')),
 241         jirafeau_ini_to_bytes(ini_get('upload_max_filesize'))
 242     );
 243 }
 244
 245 /**
 246  * gets the maximum upload size according to php.ini
 247  * @returns the maximum upload size string
 248  */
 249 function jirafeau_get_max_upload_size()
 250 {
 251     return jirafeau_human_size(jirafeau_get_max_upload_size_bytes());
 252 }
 253
 254 /**
 255  * get the maximal upload size for a data chunk in async uploads
 256  * @param max_upload_chunk_size_bytes
 257  */
 258 function jirafeau_get_max_upload_chunk_size_bytes($max_upload_chunk_size_bytes = 0)
 259 {
 260     if ($max_upload_chunk_size_bytes == 0) {
 261         $size = jirafeau_get_max_upload_size_bytes();
 262         // Jirafeau must choose an arbitrary number as PHP config does not give any limit nor $max_upload_chunk_size_bytes
 263         if ($size == 0) {
 264             return 10000000; // 10MB
 265         }
 266         return $size;
 267     }
 268     $size = min(
 269         jirafeau_get_max_upload_size_bytes(),
 270         $max_upload_chunk_size_bytes
 271     );
 272     if ($size == 0) {
 273         return $max_upload_chunk_size_bytes;
 274     }
 275     return $size;
 276 }
 277
 278 /**
 279  * gets a string explaining the error
 280  * @param $code the error code
 281  * @returns a string explaining the error
 282  */
 283 function jirafeau_upload_errstr($code)
 284 {
 285     switch ($code) {
 286         case UPLOAD_ERR_INI_SIZE:
 287         case UPLOAD_ERR_FORM_SIZE:
 288             return t('Your file exceeds the maximum authorized file size. ');
 289
 290         case UPLOAD_ERR_PARTIAL:
 291         case UPLOAD_ERR_NO_FILE:
 292             return
 293                 t('Your file was not uploaded correctly. You may succeed in retrying. ');
 294
 295         case UPLOAD_ERR_NO_TMP_DIR:
 296         case UPLOAD_ERR_CANT_WRITE:
 297         case UPLOAD_ERR_EXTENSION:
 298             return t('Internal error. You may not succeed in retrying. ');
 299     }
 300     return t('Unknown error. ');
 301 }
 302
 303 /** Remove link and it's file
 304  * @param $link the link's name (hash)
 305  */
 306
 307 function jirafeau_delete_link($link)
 308 {
 309     $l = jirafeau_get_link($link);
 310     if (!count($l)) {
 311         return;
 312     }
 313
 314     jirafeau_clean_rm_link($link);
 315
 316     $hash = $l['hash'];
 317     $p = s2p("$hash");
 318
 319     $counter = 1;
 320     if (file_exists(VAR_FILES . $p . $hash. '_count')) {
 321         $content = file(VAR_FILES . $p . $hash. '_count');
 322         $counter = trim($content[0]);
 323     }
 324     $counter--;
 325
 326     if ($counter >= 1) {
 327         $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 328         fwrite($handle, $counter);
 329         fclose($handle);
 330     }
 331
 332     if ($counter == 0) {
 333         jirafeau_clean_rm_file($hash);
 334     }
 335 }
 336
 337 /**
 338  * Delete a file and it's links.
 339  */
 340 function jirafeau_delete_file($hash)
 341 {
 342     $count = 0;
 343     /* Get all links files. */
 344     $stack = array(VAR_LINKS);
 345     while (($d = array_shift($stack)) && $d != null) {
 346         $dir = scandir($d);
 347
 348         foreach ($dir as $node) {
 349             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 350                 preg_match('/\.tmp/i', "$node")) {
 351                 continue;
 352             }
 353
 354             if (is_dir($d . $node)) {
 355                 /* Push new found directory. */
 356                 $stack[] = $d . $node . '/';
 357             } elseif (is_file($d . $node)) {
 358                 /* Read link informations. */
 359                 $l = jirafeau_get_link(basename($node));
 360                 if (!count($l)) {
 361                     continue;
 362                 }
 363                 if ($l['hash'] == $hash) {
 364                     $count++;
 365                     jirafeau_delete_link($node);
 366                 }
 367             }
 368         }
 369     }
 370     jirafeau_clean_rm_file($hash);
 371     return $count;
 372 }
 373
 374
 375 /** hash file's content
 376  * @param $method hash method, see 'file_hash' option. Valid methods are 'md5', 'md5_outside' or 'random'
 377  * @param $file_path file to hash
 378  * @returns hash string
 379  */
 380 function jirafeau_hash_file($method, $file_path)
 381 {
 382     switch ($method) {
 383         case 'md5_outside':
 384             return jirafeau_md5_outside($file_path);
 385         case 'md5':
 386             return md5_file($file_path);
 387         case 'random':
 388             return jirafeau_gen_random(32);
 389     }
 390     return md5_file($file_path);
 391 }
 392
 393 /** hash part of file: start, end and size.
 394  * This is a partial file hash, faster but weaker.
 395  * @param $file_path file to hash
 396  * @returns hash string
 397  */
 398 function jirafeau_md5_outside($file_path)
 399 {
 400     $out = false;
 401     $handle = fopen($file_path, "r");
 402     if ($handle === false) {
 403         return false;
 404     }
 405     $size = filesize($file_path);
 406     if ($size === false) {
 407         goto err;
 408     }
 409     $first = fread($handle, 64);
 410     if ($first === false) {
 411         goto err;
 412     }
 413     if (fseek($handle, $size < 64 ? 0 : $size - 64) == -1) {
 414         goto err;
 415     }
 416     $last = fread($handle, 64);
 417     if ($last === false) {
 418         goto err;
 419     }
 420     $out = md5($first . $last . $size);
 421     err:
 422     fclose($handle);
 423     return $out;
 424 }
 425
 426 /**
 427  * handles an uploaded file
 428  * @param $file the file struct given by $_FILE[]
 429  * @param $one_time_download is the file a one time download ?
 430  * @param $key if not empty, protect the file with this key
 431  * @param $time the time of validity of the file
 432  * @param $ip uploader's ip
 433  * @param $crypt boolean asking to crypt or not
 434  * @param $link_name_length size of the link name
 435  * @returns an array containing some information
 436  *   'error' => information on possible errors
 437  *   'link' => the link name of the uploaded file
 438  *   'delete_link' => the link code to delete file
 439  */
 440 function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $link_name_length, $file_hash_method)
 441 {
 442     if (empty($file['tmp_name']) || !is_uploaded_file($file['tmp_name'])) {
 443         return (array(
 444                  'error' =>
 445                    array('has_error' => true,
 446                           'why' => jirafeau_upload_errstr($file['error'])),
 447                  'link' => '',
 448                  'delete_link' => ''));
 449     }
 450
 451     /* array representing no error */
 452     $noerr = array('has_error' => false, 'why' => '');
 453
 454     /* Crypt file if option is enabled. */
 455     $crypted = false;
 456     $crypt_key = '';
 457     if ($crypt == true && !(extension_loaded('sodium') == true)) {
 458         error_log("PHP extension sodium not loaded, won't encrypt in Jirafeau");
 459     }
 460     if ($crypt == true && extension_loaded('sodium') == true) {
 461         $crypt_key = jirafeau_encrypt_file($file['tmp_name'], $file['tmp_name'].'crypt');
 462         if (strlen($crypt_key) > 0) {
 463             $crypted = true;
 464             rename($file['tmp_name'].'crypt', $file['tmp_name']);
 465         }
 466     }
 467
 468     /* file information */
 469     $hash = jirafeau_hash_file($file_hash_method, $file['tmp_name']);
 470     $name = str_replace(NL, '', trim($file['name']));
 471     $mime_type = $file['type'];
 472     $size = $file['size'];
 473
 474     /* does file already exist ? */
 475     $rc = false;
 476     $p = s2p("$hash");
 477     if (file_exists(VAR_FILES . $p .  $hash)) {
 478         $rc = unlink($file['tmp_name']);
 479     } elseif ((file_exists(VAR_FILES . $p) || @mkdir(VAR_FILES . $p, 0755, true))
 480             && move_uploaded_file($file['tmp_name'], VAR_FILES . $p . $hash)) {
 481         $rc = true;
 482     }
 483     if (!$rc) {
 484         return (array(
 485                  'error' =>
 486                    array('has_error' => true,
 487                           'why' => t('INTERNAL_ERROR_DEL')),
 488                  'link' =>'',
 489                  'delete_link' => ''));
 490     }
 491
 492     /* Increment or create count file. */
 493     $counter = 0;
 494     if (file_exists(VAR_FILES . $p . $hash . '_count')) {
 495         $content = file(VAR_FILES . $p . $hash. '_count');
 496         $counter = trim($content[0]);
 497     }
 498     $counter++;
 499     $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 500     fwrite($handle, $counter);
 501     fclose($handle);
 502
 503     /* Create delete code. */
 504     $delete_link_code = jirafeau_gen_random(5);
 505
 506     /* hash password or empty. */
 507     $password = '';
 508     if (!empty($key)) {
 509         $password = md5($key);
 510     }
 511
 512     /* create link file */
 513     $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
 514     $handle = fopen($link_tmp_name, 'w');
 515     fwrite(
 516         $handle,
 517         $name . NL. $mime_type . NL. $size . NL. $password . NL. $time .
 518             NL . $hash. NL . ($one_time_download ? 'O' : 'R') . NL . time() .
 519             NL . $ip . NL. $delete_link_code . NL . ($crypted ? 'C2' : 'O')
 520     );
 521     fclose($handle);
 522     $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 523     $l = s2p("$hash_link");
 524     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 525         !rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
 526         if (file_exists($link_tmp_name)) {
 527             unlink($link_tmp_name);
 528         }
 529
 530         $counter--;
 531         if ($counter >= 1) {
 532             $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 533             fwrite($handle, $counter);
 534             fclose($handle);
 535         } else {
 536             jirafeau_clean_rm_file($hash_link);
 537         }
 538         return array(
 539                  'error' =>
 540                    array('has_error' => true,
 541                           'why' => t('Internal error during file creation. ')),
 542                  'link' =>'',
 543                  'delete_link' => '');
 544     }
 545     return array( 'error' => $noerr,
 546                   'link' => $hash_link,
 547                   'delete_link' => $delete_link_code,
 548                   'crypt_key' => $crypt_key);
 549 }
 550
 551 /**
 552  * Tells if a mime-type is viewable in a browser
 553  * @param $mime the mime type
 554  * @returns a boolean telling if a mime type is viewable
 555  */
 556 function jirafeau_is_viewable($mime)
 557 {
 558     if (!empty($mime)) {
 559         $viewable = array('image', 'video', 'audio');
 560         $decomposed = explode('/', $mime);
 561         if (in_array($decomposed[0], $viewable) && strpos($mime, 'image/svg+xml') === false) {
 562             return true;
 563         }
 564         $viewable = array('text/plain');
 565         if (in_array($mime, $viewable)) {
 566             return true;
 567         }
 568     }
 569     return false;
 570 }
 571
 572 // Error handling functions.
 573 //! Global array that contains all registered errors.
 574 $error_list = array();
 575
 576 /**
 577  * Adds an error to the list of errors.
 578  * @param $title the error's title
 579  * @param $description is a human-friendly description of the problem.
 580  */
 581 function add_error($title, $description)
 582 {
 583     global $error_list;
 584     $error_list[] = '<p>' . $title. '<br />' . $description. '</p>';
 585 }
 586
 587 /**
 588  * Informs whether any error has been registered yet.
 589  * @return true if there are errors.
 590  */
 591 function has_error()
 592 {
 593     global $error_list;
 594     return !empty($error_list);
 595 }
 596
 597 /**
 598  * Displays all the errors.
 599  */
 600 function show_errors()
 601 {
 602     if (has_error()) {
 603         global $error_list;
 604         echo '<div class="error">';
 605         foreach ($error_list as $error) {
 606             echo $error;
 607         }
 608         echo '</div>';
 609     }
 610 }
 611
 612 function check_errors($cfg)
 613 {
 614     if (!($cfg['installation_done'] === true)) {
 615         if (file_exists(JIRAFEAU_ROOT . 'install.php')) {
 616             header('Location: install.php');
 617             exit;
 618         } else {
 619             add_error(t('INSTALL_FILE_NOT_FOUND_TITLE'), t('INSTALL_FILE_NOT_FOUND_DESC'));
 620         }
 621     }
 622
 623     if (!is_writable(VAR_FILES)) {
 624         add_error(t('FILE_DIR_W'), VAR_FILES);
 625     }
 626
 627     if (!is_writable(VAR_LINKS)) {
 628         add_error(t('LINK_DIR_W'), VAR_LINKS);
 629     }
 630
 631     if (!is_writable(VAR_ASYNC)) {
 632         add_error(t('ASYNC_DIR_W'), VAR_ASYNC);
 633     }
 634
 635     if ($cfg['enable_crypt'] && $cfg['litespeed_workaround']) {
 636         add_error(t('INCOMPATIBLE_OPTIONS_W'), 'enable_crypt=true<br>litespeed_workaround=true');
 637     }
 638
 639     if ($cfg['one_time_download'] && $cfg['litespeed_workaround']) {
 640         add_error(t('INCOMPATIBLE_OPTIONS_W'), 'one_time_download=true<br>litespeed_workaround=true');
 641     }
 642 }
 643
 644 /**
 645  * Read link information
 646  * @return array containing information.
 647  */
 648 function jirafeau_get_link($hash)
 649 {
 650     $out = array();
 651     $link = VAR_LINKS . s2p("$hash") . $hash;
 652
 653     if (!file_exists($link)) {
 654         return $out;
 655     }
 656
 657     $c = file($link);
 658     $out['file_name'] = trim($c[0]);
 659     $out['mime_type'] = trim($c[1]);
 660     $out['file_size'] = trim($c[2]);
 661     $out['key'] = trim($c[3], NL);
 662     $out['time'] = trim($c[4]);
 663     $out['hash'] = trim($c[5]);
 664     $out['onetime'] = trim($c[6]);
 665     $out['upload_date'] = trim($c[7]);
 666     $out['ip'] = trim($c[8]);
 667     $out['link_code'] = trim($c[9]);
 668     $out['crypted'] = trim($c[10]) == 'C2';
 669     $out['crypted_legacy'] = trim($c[10]) == 'C';
 670
 671     return $out;
 672 }
 673
 674 /**
 675  * List files in admin interface.
 676  */
 677 function jirafeau_admin_list($name, $file_hash, $link_hash)
 678 {
 679     echo '<fieldset><legend>';
 680     if (!empty($name)) {
 681         echo t('FILENAME') . ": " . jirafeau_escape($name);
 682     }
 683     if (!empty($file_hash)) {
 684         echo t('FILE') . ": " . jirafeau_escape($file_hash);
 685     }
 686     if (!empty($link_hash)) {
 687         echo t('LINK') . ": " . jirafeau_escape($link_hash);
 688     }
 689     if (empty($name) && empty($file_hash) && empty($link_hash)) {
 690         echo t('LS_FILES');
 691     }
 692     echo '</legend>';
 693     echo '<table>';
 694     echo '<tr>';
 695     echo '<th></th>';
 696     echo '<th>' . t('ACTION') . '</th>';
 697     echo '</tr>';
 698
 699     /* Get all links files. */
 700     $stack = array(VAR_LINKS);
 701     while (($d = array_shift($stack)) && $d != null) {
 702         $dir = scandir($d);
 703         foreach ($dir as $node) {
 704             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 705                 preg_match('/\.tmp/i', "$node")) {
 706                 continue;
 707             }
 708             if (is_dir($d . $node)) {
 709                 /* Push new found directory. */
 710                 $stack[] = $d . $node . '/';
 711             } elseif (is_file($d . $node)) {
 712                 /* Read link information. */
 713                 $l = jirafeau_get_link($node);
 714                 if (!count($l)) {
 715                     continue;
 716                 }
 717                 $ld = jirafeau_get_download_stats($node);
 718
 719                 /* Filter. */
 720                 if (!empty($name) && !@preg_match("/$name/i", jirafeau_escape($l['file_name']))) {
 721                     continue;
 722                 }
 723                 if (!empty($file_hash) && $file_hash != $l['hash']) {
 724                     continue;
 725                 }
 726                 if (!empty($link_hash) && $link_hash != $node) {
 727                     continue;
 728                 }
 729                 /* Print link information. */
 730                 echo '<tr>';
 731                 echo '<td>' .
 732                 '<strong><a id="upload_link" href="f.php?h='. jirafeau_escape($node) .'" title="' .
 733                     t('DL_PAGE') . '">' . jirafeau_escape($l['file_name']) . '</a></strong><br/>';
 734                 echo t('TYPE') . ': ' . jirafeau_escape($l['mime_type']) . '<br/>';
 735                 echo t('SIZE') . ': ' . jirafeau_human_size($l['file_size']) . '<br>';
 736                 echo t('EXPIRE') . ': ' . ($l['time'] == -1 ? '∞' : jirafeau_get_datetimefield($l['time'])) . '<br/>';
 737                 echo t('ONETIME') . ': ' . ($l['onetime'] == 'O' ? 'Yes' : 'No') . '<br/>';
 738                 echo t('UPLOAD_DATE') . ': ' . jirafeau_get_datetimefield($l['upload_date']) . '<br/>';
 739                 if (strlen($l['ip']) > 0) {
 740                     echo t('ORIGIN') . ': ' . $l['ip'] . '<br/>';
 741                 }
 742                 echo t('DOWNLOAD_COUNT') . ': ' . $ld['count'] . '<br/>';
 743                 if ($ld['count'] > 0) {
 744                     echo t('DOWNLOAD_DATE') . ': ' . jirafeau_get_datetimefield($ld['date']) . '<br/>';
 745                     echo t('DOWNLOAD_IP') . ': ' . $ld['ip'] . '<br/>';
 746                 }
 747                 echo '</td><td>';
 748                 echo '<form method="post">' .
 749                 '<input type = "hidden" name = "action" value = "download"/>' .
 750                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 751                 jirafeau_admin_csrf_field() .
 752                 '<input type = "submit" value = "' . t('DL') . '" />' .
 753                 '</form>' .
 754                 '<form method="post">' .
 755                 '<input type = "hidden" name = "action" value = "delete_link"/>' .
 756                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 757                 jirafeau_admin_csrf_field() .
 758                 '<input type = "submit" value = "' . t('DEL_LINK') . '" />' .
 759                 '</form>' .
 760                 '<form method="post">' .
 761                 '<input type = "hidden" name = "action" value = "delete_file"/>' .
 762                 '<input type = "hidden" name = "hash" value = "' . $l['hash'] . '"/>' .
 763                 jirafeau_admin_csrf_field() .
 764                 '<input type = "submit" value = "' . t('DEL_FILE_LINKS') . '" />' .
 765                 '</form>' .
 766                 '</td>';
 767                 echo '</tr>';
 768             }
 769         }
 770     }
 771     echo '</table></fieldset>';
 772 }
 773
 774 /**
 775  * Clean expired files.
 776  * @return number of cleaned files.
 777  */
 778 function jirafeau_admin_clean()
 779 {
 780     $count = 0;
 781     /* Get all links files. */
 782     $stack = array(VAR_LINKS);
 783     while (($d = array_shift($stack)) && $d != null) {
 784         $dir = scandir($d);
 785
 786         foreach ($dir as $node) {
 787             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 788                 preg_match('/\.tmp/i', "$node")) {
 789                 continue;
 790             }
 791
 792             if (is_dir($d . $node)) {
 793                 /* Push new found directory. */
 794                 $stack[] = $d . $node . '/';
 795             } elseif (is_file($d . $node)) {
 796                 /* Read link information. */
 797                 $l = jirafeau_get_link(basename($node));
 798                 if (!count($l)) {
 799                     continue;
 800                 }
 801                 $p = s2p($l['hash']);
 802                 if ($l['time'] > 0 && $l['time'] < time() || // expired
 803                     !file_exists(VAR_FILES . $p . $l['hash']) || // invalid
 804                     !file_exists(VAR_FILES . $p . $l['hash'] . '_count')) { // invalid
 805                     jirafeau_delete_link($node);
 806                     $count++;
 807                 }
 808             }
 809         }
 810     }
 811     return $count;
 812 }
 813
 814
 815 /**
 816  * Clean old async transfers.
 817  * @return number of cleaned files.
 818  */
 819 function jirafeau_admin_clean_async()
 820 {
 821     $count = 0;
 822     /* Get all links files. */
 823     $stack = array(VAR_ASYNC);
 824     while (($d = array_shift($stack)) && $d != null) {
 825         $dir = scandir($d);
 826
 827         foreach ($dir as $node) {
 828             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 829                 preg_match('/\.tmp/i', "$node")) {
 830                 continue;
 831             }
 832
 833             if (is_dir($d . $node)) {
 834                 /* Push new found directory. */
 835                 $stack[] = $d . $node . '/';
 836             } elseif (is_file($d . $node)) {
 837                 /* Read async information. */
 838                 $a = jirafeau_get_async_ref(basename($node));
 839                 if (!count($a)) {
 840                     continue;
 841                 }
 842                 /* Delete transfers older than 1 hour. */
 843                 if (time() - $a['last_edited'] > 3600) {
 844                     jirafeau_async_delete(basename($node));
 845                     $count++;
 846                 }
 847             }
 848         }
 849     }
 850     return $count;
 851 }
 852
 853 /**
 854  * Better strval function for debug purposes
 855  */
 856 function jirafeau_strval($value)
 857 {
 858     if (gettype($value) == "boolean") {
 859         return $value ? 'true' : 'false';
 860     }
 861     return strval($value);
 862 }
 863
 864 /**
 865  * Show file/folder permissions
 866  */
 867 function jirafeau_fileperms($path)
 868 {
 869     $out = substr(sprintf("%o", @fileperms($path)), -4) . ", ";
 870     $out .= "read " . (is_readable($path) ? "OK" : "KO") . ", ";
 871     $out .= "write " . (is_writable($path) ? "OK" : "KO");
 872     return $out;
 873 }
 874
 875 /**
 876  * Show some useful informations for bug reporting.
 877  */
 878 function jirafeau_admin_bug_report($cfg)
 879 {
 880     $out = "<fieldset><legend>" . t('REPORTING_AN_ISSUE') . "</legend>";
 881     $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>";
 882
 883     $out .= "# Jirafeau<br/>";
 884     $out .= "- version: " . JIRAFEAU_VERSION . "<br/>";
 885     $jirafeau_options = [
 886         'debug',
 887         'file_hash',
 888         'litespeed_workaround',
 889         'store_uploader_ip',
 890         'installation_done',
 891         'enable_crypt',
 892         'preview',
 893         'maximal_upload_size',
 894         'store_uploader_ip',
 895         'max_upload_chunk_size_bytes'
 896     ];
 897     foreach ($jirafeau_options as &$o) {
 898         $v = $cfg[$o];
 899         $out .= "- $o: " . jirafeau_strval($v) . " (" . gettype($v) . ")<br/>";
 900     }
 901     $out .= "<br/>";
 902
 903     $out .= "# PHP options<br/>";
 904     $out .= "- php version: " . phpversion() . "<br/>";
 905     $out .= "- sodium version: " . phpversion('sodium') . "<br/>";
 906     $out .= "- mcrypt version: " . phpversion('mcrypt') . "<br/>";
 907     $php_options =  [
 908         'post_max_size',
 909         'upload_max_filesize',
 910         'safe_mode',
 911         'max_execution_time',
 912         'max_input_time'
 913     ];
 914     foreach ($php_options as &$o) {
 915         $v = ini_get($o);
 916         $out .= "- $o: " . jirafeau_strval($v) . " (" . gettype($v). ")<br/>";
 917     }
 918     $out .= "- can set_time_limit: " . (set_time_limit(0) ? "yes" : "no") . "<br/>";
 919     $out .= "<br/>";
 920
 921     $out .= "# File permissions<br/>";
 922     $out .= "- 'var' folder permissions: " . jirafeau_fileperms($cfg['var_root']) . "<br/>";
 923     $out .= "- 'file' folder permissions: " . jirafeau_fileperms(VAR_FILES) . "<br/>";
 924     $out .= "- 'links' folder permissions: " . jirafeau_fileperms(VAR_LINKS) . "<br/>";
 925     $out .= "- 'async' folder permissions: " . jirafeau_fileperms(VAR_ASYNC) . "<br/>";
 926     $out .= "<br/>";
 927
 928     $out .= "# Server details<br/>";
 929     $out .= "- server software: " . $_SERVER["SERVER_SOFTWARE"] . "<br/>";
 930     $out .= "<br/>";
 931
 932     $out .= "# OS details<br/>";
 933     $out .= "- OS: " . php_uname() . "<br/>";
 934     $out .= "<br/>";
 935
 936     $out .= "# Browser details<br/>";
 937     $out .= "<script type='text/javascript' lang='Javascript'>
 938         // @license magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt AGPL-v3-or-Later
 939         document.write('- html5 support: ' + (check_html5_file_api() ? 'yes' : 'no') + '<br/>');
 940         document.write('- user agent: ' + navigator.userAgent + '<br/>');
 941         // @license-end
 942         </script>";
 943     $out .= "<br/>";
 944
 945     $out .= "# Memory<br/>";
 946     $out .= "- memory_get_peak_usage: " . jirafeau_human_size(memory_get_peak_usage()) . "<br/>";
 947
 948     $out .= "</code></fieldset>";
 949     return $out;
 950 }
 951
 952 /**
 953  * Read async transfer information
 954  * @return array containing information.
 955  */
 956 function jirafeau_get_async_ref($ref)
 957 {
 958     $out = array();
 959     $refinfos = VAR_ASYNC . s2p("$ref") . "$ref";
 960
 961     if (!file_exists($refinfos)) {
 962         return $out;
 963     }
 964
 965     $c = file($refinfos);
 966     $out['file_name'] = trim($c[0]);
 967     $out['mime_type'] = trim($c[1]);
 968     $out['key'] = trim($c[2], NL);
 969     $out['time'] = trim($c[3]);
 970     $out['onetime'] = trim($c[4]);
 971     $out['ip'] = trim($c[5]);
 972     $out['last_edited'] = trim($c[6]);
 973     $out['next_code'] = trim($c[7]);
 974     return $out;
 975 }
 976
 977 /**
 978  * Delete async transfer information
 979  */
 980 function jirafeau_async_delete($ref)
 981 {
 982     $p = s2p("$ref");
 983     if (file_exists(VAR_ASYNC . $p . $ref)) {
 984         unlink(VAR_ASYNC . $p . $ref);
 985     }
 986     if (file_exists(VAR_ASYNC . $p . $ref . '_data')) {
 987         unlink(VAR_ASYNC . $p . $ref . '_data');
 988     }
 989     $parse = VAR_ASYNC . $p;
 990     $scan = array();
 991     while (file_exists($parse)
 992            && ($scan = scandir($parse))
 993            && count($scan) == 2 // '.' and '..' folders => empty.
 994            && basename($parse) != basename(VAR_ASYNC)) {
 995         rmdir($parse);
 996         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 997     }
 998 }
 999
1000 /**
1001   * Init a new asynchronous upload.
1002   * @param $filename Name of the file to send
1003   * @param $one_time One time upload parameter
1004   * @param $key eventual password (or blank)
1005   * @param $time time limit
1006   * @param $ip ip address of the client
1007   * @return a string containing a temporary reference followed by a code or a string starting with 'Error'
1008   */
1009 function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
1010 {
1011     /* Create temporary folder. */
1012     $ref;
1013     $p;
1014     $code = jirafeau_gen_random(4);
1015     do {
1016         $ref = jirafeau_gen_random(32);
1017         $p = VAR_ASYNC . s2p($ref);
1018     } while (file_exists($p));
1019     @mkdir($p, 0755, true);
1020     if (!file_exists($p)) {
1021         return 'Error: cannot create async folder.';
1022     }
1023
1024     /* touch empty data file */
1025     $w_path = $p . $ref . '_data';
1026     touch($w_path);
1027
1028     /* md5 password or empty */
1029     $password = '';
1030     if (!empty($key)) {
1031         $password = md5($key);
1032     }
1033
1034     /* Store information. */
1035     $p .= $ref;
1036     $handle = fopen($p, 'w');
1037     fwrite(
1038         $handle,
1039         str_replace(NL, '', trim($filename)) . NL .
1040             str_replace(NL, '', trim($type)) . NL . $password . NL .
1041             $time . NL . ($one_time ? 'O' : 'R') . NL . $ip . NL .
1042             time() . NL . $code . NL
1043     );
1044     fclose($handle);
1045
1046     return $ref . NL . $code ;
1047 }
1048
1049 /**
1050   * Append a piece of file on the asynchronous upload.
1051   * @param $ref asynchronous upload reference
1052   * @param $file piece of data
1053   * @param $code client code for this operation
1054   * @param $max_file_size maximum allowed file size
1055   * @return a string containing a next code to use or a string starting with 'Error'
1056   */
1057 function jirafeau_async_push($ref, $data, $code, $max_file_size)
1058 {
1059     /* Get async infos. */
1060     $a = jirafeau_get_async_ref($ref);
1061
1062     /* Check some errors. */
1063     if (count($a) == 0) {
1064         return "Error: cannot find transfer";
1065     }
1066     if ($a['next_code'] != "$code") {
1067         return "Error: bad transfer code";
1068     }
1069     if ($data['error'] != UPLOAD_ERR_OK) {
1070         // Check error code in https://www.php.net/manual/en/features.file-upload.errors.php
1071         $data_details = print_r($data, true);
1072         return "Error: upload error: {$data_details}";
1073     }
1074     if (empty($data['tmp_name'])) {
1075         return "Error: missing tmp_name";
1076     }
1077     if (!is_uploaded_file($data['tmp_name'])) {
1078         return "Error: tmp_name may not be uploaded";
1079     }
1080
1081     $p = s2p($ref);
1082
1083     /* File path. */
1084     $r_path = $data['tmp_name'];
1085     $w_path = VAR_ASYNC . $p . $ref . '_data';
1086
1087     /* Check that file size is not above upload limit. */
1088     if ($max_file_size > 0 &&
1089         filesize($r_path) + filesize($w_path) > $max_file_size * 1024 * 1024) {
1090         jirafeau_async_delete($ref);
1091         return "Error: file size is above upload limit";
1092     }
1093
1094     /* Concatenate data. */
1095     $r = fopen($r_path, 'r');
1096     $w = fopen($w_path, 'a');
1097     while (!feof($r)) {
1098         if (fwrite($w, fread($r, 1024)) === false) {
1099             fclose($r);
1100             fclose($w);
1101             jirafeau_async_delete($ref);
1102             return "Error: cannot write file";
1103         }
1104     }
1105     fclose($r);
1106     fclose($w);
1107     unlink($r_path);
1108
1109     /* Update async file. */
1110     $code = jirafeau_gen_random(4);
1111     $handle = fopen(VAR_ASYNC . $p . $ref, 'w');
1112     fwrite(
1113         $handle,
1114         $a['file_name'] . NL. $a['mime_type'] . NL. $a['key'] . NL .
1115             $a['time'] . NL . $a['onetime'] . NL . $a['ip'] . NL .
1116             time() . NL . $code . NL
1117     );
1118     fclose($handle);
1119     return $code;
1120 }
1121
1122 /**
1123   * Finalize an asynchronous upload.
1124   * @param $ref asynchronous upload reference
1125   * @param $code client code for this operation
1126   * @param $crypt boolean asking to crypt or not
1127   * @param $link_name_length link name length
1128   * @return a string containing the download reference followed by a delete code or a string starting with 'Error'
1129   */
1130 function jirafeau_async_end($ref, $code, $crypt, $link_name_length, $file_hash_method)
1131 {
1132     /* Get async infos. */
1133     $a = jirafeau_get_async_ref($ref);
1134     if (count($a) == 0
1135         || $a['next_code'] != "$code") {
1136         return "Error: bad code for ending transfer";
1137     }
1138
1139     /* Generate link infos. */
1140     $p = VAR_ASYNC . s2p($ref) . $ref . "_data";
1141     if (!file_exists($p)) {
1142         return "Error: referenced file does not exist";
1143     }
1144
1145     $crypted = false;
1146     $crypt_key = '';
1147     if ($crypt == true && extension_loaded('sodium') == true) {
1148         //$crypt_key = jirafeau_encrypt_file($p, $p);
1149         $crypt_key = jirafeau_encrypt_file($p, $p.'.crypt');
1150         if (strlen($crypt_key) > 0) {
1151             $crypted = true;
1152             rename($p.'.crypt', $p);
1153         }
1154     }
1155
1156     $hash = jirafeau_hash_file($file_hash_method, $p);
1157     $size = filesize($p);
1158     $np = s2p($hash);
1159     $delete_link_code = jirafeau_gen_random(5);
1160
1161     /* File already exist ? */
1162     if (!file_exists(VAR_FILES . $np)) {
1163         @mkdir(VAR_FILES . $np, 0755, true);
1164     }
1165     if (!file_exists(VAR_FILES . $np . $hash)) {
1166         rename($p, VAR_FILES . $np . $hash);
1167     }
1168
1169     /* Increment or create count file. */
1170     $counter = 0;
1171     if (file_exists(VAR_FILES . $np . $hash . '_count')) {
1172         $content = file(VAR_FILES . $np . $hash. '_count');
1173         $counter = trim($content[0]);
1174     }
1175     $counter++;
1176     $handle = fopen(VAR_FILES . $np . $hash. '_count', 'w');
1177     fwrite($handle, $counter);
1178     fclose($handle);
1179
1180     /* Create link. */
1181     $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
1182     $handle = fopen($link_tmp_name, 'w');
1183     fwrite(
1184         $handle,
1185         $a['file_name'] . NL . $a['mime_type'] . NL . $size . NL .
1186             $a['key'] . NL . $a['time'] . NL . $hash . NL . $a['onetime'] . NL .
1187             time() . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C2' : 'O')
1188     );
1189     fclose($handle);
1190     $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
1191     $l = s2p("$hash_link");
1192     if (!@mkdir(VAR_LINKS . $l, 0755, true)) {
1193         return "Error: cannot create folder in LINKS";
1194     }
1195     if (!rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
1196         return "Error: cannot rename file in LINKS";
1197     }
1198
1199     /* Clean async upload. */
1200     jirafeau_async_delete($ref);
1201     return $hash_link . NL . $delete_link_code . NL . urlencode($crypt_key);
1202 }
1203
1204 function jirafeau_crypt_create_iv($base, $size)
1205 {
1206     $iv = '';
1207     while (strlen($iv) < $size) {
1208         $iv = $iv . $base;
1209     }
1210     $iv = substr($iv, 0, $size);
1211     return $iv;
1212 }
1213
1214 /**
1215  * Crypt file and returns decrypt key.
1216  * @param $fp_src file path to the file to crypt.
1217  * @param $fp_dst file path to the file to write crypted file (could be the same).
1218  * @return decrypt key composed of the key and the iv separated by a point ('.')
1219  */
1220 function jirafeau_encrypt_file($fp_src, $fp_dst)
1221 {
1222     $fs = filesize($fp_src);
1223     if ($fs === false || $fs == 0 || !(extension_loaded('sodium') == true)) {
1224         return '';
1225     }
1226
1227     /* Generate key. */
1228     $crypt_key = bin2hex(random_bytes(SODIUM_CRYPTO_STREAM_XCHACHA20_KEYBYTES / 2));
1229     /* Init module. */
1230     [$crypt_state, $crypt_header] = sodium_crypto_secretstream_xchacha20poly1305_init_push($crypt_key);
1231     /* Crypt file. */
1232     $r = fopen($fp_src, 'rb');
1233     $w = fopen($fp_dst, 'wb');
1234     fwrite($w, $crypt_header);
1235
1236     for ($i = 0; $i < $fs; $i += JIRAFEAU_SODIUM_CHUNKSIZE) {
1237         $to_enc = fread($r, JIRAFEAU_SODIUM_CHUNKSIZE);
1238         $enc = sodium_crypto_secretstream_xchacha20poly1305_push($crypt_state, $to_enc);
1239
1240         if (fwrite($w, $enc) === false) {
1241            return '';
1242         }
1243     }
1244
1245     fclose($r);
1246     fclose($w);
1247
1248     /* Cleanup. */
1249     sodium_memzero($crypt_state);
1250
1251     return $crypt_key;
1252 }
1253
1254 /**
1255  * Decrypt file.
1256  * @param $fp_src file path to the file to decrypt.
1257  * @param $fp_dst file path to the file to write decrypted file (could be the same).
1258  * @param $k string composed of the key and the iv separated by a point ('.')
1259  * @return key used to decrypt. a string of length 0 is returned if failed.
1260  */
1261 function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
1262 {
1263     $fs = filesize($fp_src);
1264     if ($fs === false || $fs == 0 || extension_loaded('sodium') == false) {
1265         return false;
1266     }
1267
1268     /* Decrypt file. */
1269     $r = fopen(VAR_FILES . $p . $link['hash'], 'rb');
1270
1271     $crypt_header = fread($r, SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES);
1272
1273     /* Init module. */
1274     $crypt_state = sodium_crypto_secretstream_xchacha20poly1305_init_pull($crypt_header, $crypt_key);
1275
1276     /* Decrypt file. */
1277
1278     for ($i = SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_HEADERBYTES; $i < $fs; $i += JIRAFEAU_SODIUM_CHUNKSIZE + SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES) {
1279         $to_dec = fread($r, JIRAFEAU_SODIUM_CHUNKSIZE + SODIUM_CRYPTO_SECRETSTREAM_XCHACHA20POLY1305_ABYTES);
1280         [$dec, $crypt_tag] = sodium_crypto_secretstream_xchacha20poly1305_pull($crypt_state, $to_dec);
1281         echo $dec;
1282     }
1283
1284     fclose($r);
1285
1286     /* Cleanup. */
1287     sodium_memzero($crypt_state);
1288
1289     return true;
1290 }
1291
1292 /**
1293  * Decrypt file.
1294  * @param $fp_src file path to the file to decrypt.
1295  * @param $fp_dst file path to the file to write decrypted file (could be the same).
1296  * @param $k string composed of the key and the iv separated by a point ('.')
1297  * @return key used to decrypt. a string of length 0 is returned if failed.
1298  */
1299 function jirafeau_decrypt_file_legacy($fp_src, $fp_dst, $k)
1300 {
1301     $fs = filesize($fp_src);
1302     if ($fs === false || $fs == 0 || extension_loaded('mcrypt') == false) {
1303         return false;
1304     }
1305
1306     /* Init module */
1307     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1308     /* Extract key and iv. */
1309     $crypt_key = $k;
1310     $hash_key = md5($crypt_key);
1311     $iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
1312     /* Decrypt file. */
1313     $r = fopen($fp_src, 'r');
1314     $w = fopen($fp_dst, 'c');
1315     while (!feof($r)) {
1316         $dec = mdecrypt_generic($m, fread($r, 1024));
1317         if (fwrite($w, $dec) === false) {
1318             return false;
1319         }
1320     }
1321     fclose($r);
1322     fclose($w);
1323     /* Cleanup. */
1324     mcrypt_generic_deinit($m);
1325     mcrypt_module_close($m);
1326     return true;
1327 }
1328
1329 /**
1330  * Check if Jirafeau is password protected for visitors.
1331  * @return true if Jirafeau is password protected, false otherwise.
1332  */
1333 function jirafeau_has_upload_password($cfg)
1334 {
1335     return count($cfg['upload_password']) > 0;
1336 }
1337
1338 /**
1339  * Challenge password for a visitor.
1340  * @param $password password to be challenged
1341  * @return true if password is valid, false otherwise.
1342  */
1343 function jirafeau_challenge_upload_password($cfg, $password)
1344 {
1345     if (!jirafeau_has_upload_password($cfg)) {
1346         return false;
1347     }
1348     foreach ($cfg['upload_password'] as $p) {
1349         if ($password == $p) {
1350             return true;
1351         }
1352     }
1353     return false;
1354 }
1355
1356 /**
1357  * Test if the given IP is whitelisted by the given list.
1358  *
1359  * @param $allowedIpList array of allowed IPs
1360  * @param $challengedIp IP to be challenged
1361  * @return true if IP is authorized, false otherwise.
1362  */
1363 function jirafeau_challenge_ip($allowedIpList, $challengedIp)
1364 {
1365     foreach ($allowedIpList as $i) {
1366         if ($i == $challengedIp) {
1367             return true;
1368         }
1369         // CIDR test for IPv4 only.
1370         if (strpos($i, '/') !== false) {
1371             list($subnet, $mask) = explode('/', $i);
1372             if ((ip2long($challengedIp) & ~((1 << (32 - $mask)) - 1)) == ip2long($subnet)) {
1373                 return true;
1374             }
1375         }
1376     }
1377     return false;
1378 }
1379
1380 /**
1381  * Check if Jirafeau has a restriction on the IP address for uploading.
1382  * @return true if uploading is IP restricted, false otherwise.
1383  */
1384 function jirafeau_upload_has_ip_restriction($cfg)
1385 {
1386     return count($cfg['upload_ip']) > 0;
1387 }
1388
1389 /**
1390  * Test if visitor's IP is authorized to upload at all.
1391  *
1392  * @param $cfg configuration
1393  * @param $challengedIp IP to be challenged
1394  * @return true if IP is authorized, false otherwise.
1395  */
1396 function jirafeau_challenge_upload_ip($cfg, $challengedIp)
1397 {
1398     // If no IP address have been listed, allow upload from any IP
1399     if (!jirafeau_upload_has_ip_restriction($cfg)) {
1400         return true;
1401     }
1402     return jirafeau_challenge_ip($cfg['upload_ip'], $challengedIp);
1403 }
1404
1405 /**
1406  * Test if visitor's IP is authorized to upload without a password.
1407  *
1408  * @param $cfg configuration
1409  * @param $challengedIp IP to be challenged
1410  * @return true if IP is authorized, false otherwise.
1411  */
1412 function jirafeau_challenge_upload_ip_without_password($cfg, $challengedIp)
1413 {
1414     return jirafeau_challenge_ip($cfg['upload_ip_nopassword'], $challengedIp);
1415 }
1416
1417 /**
1418  * Test if visitor's IP is authorized or password is supplied and authorized
1419  * @param $ip IP to be challenged
1420  * @param $password password to be challenged
1421  * @return true if access is valid, false otherwise.
1422  */
1423 function jirafeau_challenge_upload($cfg, $ip, $password)
1424 {
1425     return jirafeau_challenge_upload_ip_without_password($cfg, $ip) ||
1426             (!jirafeau_has_upload_password($cfg) && !jirafeau_upload_has_ip_restriction($cfg)) ||
1427             (jirafeau_challenge_upload_password($cfg, $password) && jirafeau_challenge_upload_ip($cfg, $ip));
1428 }
1429
1430 /**
1431  * Check if Jirafeau has a restriction on the IP address for accessing the admin interface.
1432  * @return true if admin interface is IP restricted, false otherwise.
1433  */
1434 function jirafeau_admin_has_ip_restriction($cfg)
1435 {
1436     return count($cfg['admin_ip']) > 0;
1437 }
1438
1439 /**
1440  * Test if visitor's IP is authorized to access the admin interface.
1441  *
1442  * @param $cfg configuration
1443  * @param $challengedIp IP to be challenged
1444  * @return true if IP is authorized, false otherwise.
1445  */
1446 function jirafeau_challenge_admin_ip($cfg, $challengedIp)
1447 {
1448     // If no IP address have been listed, allow upload from any IP
1449     if (!jirafeau_admin_has_ip_restriction($cfg)) {
1450         return true;
1451     }
1452     return jirafeau_challenge_ip($cfg['admin_ip'], $challengedIp);
1453 }
1454
1455 /** Tell if we have some HTTP headers generated by a proxy */
1456 function has_http_forwarded()
1457 {
1458     return
1459         !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ||
1460         !empty($_SERVER['http_X_forwarded_for']);
1461 }
1462
1463 /**
1464  * Generate IP list from HTTP headers generated by a proxy
1465  * @return  array of IP strings
1466  */
1467 function get_ip_list_http_forwarded()
1468 {
1469     $ip_list = array();
1470     if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
1471         $l = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
1472         if ($l === false) {
1473             return array();
1474         }
1475         foreach ($l as $ip) {
1476             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1477         }
1478     }
1479     if (!empty($_SERVER['http_X_forwarded_for'])) {
1480         $l = explode(',', $_SERVER['http_X_forwarded_for']);
1481         foreach ($l as $ip) {
1482             // Separate IP from port
1483             $ipa = explode(':', $ip);
1484             if ($ipa === false) {
1485                 continue;
1486             }
1487             $ip = $ipa[0];
1488             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1489         }
1490     }
1491     return $ip_list;
1492 }
1493
1494 /**
1495  * Get the ip address of the client from REMOTE_ADDR
1496  * or from HTTP_X_FORWARDED_FOR if behind a proxy
1497  * @returns the client ip address
1498  */
1499 function get_ip_address($cfg)
1500 {
1501     $remote = $_SERVER['REMOTE_ADDR'];
1502     if (count($cfg['proxy_ip']) == 0 || !has_http_forwarded()) {
1503         return $remote;
1504     }
1505
1506     $ip_list = get_ip_list_http_forwarded();
1507     if (count($ip_list) == 0) {
1508         return $remote;
1509     }
1510
1511     foreach ($cfg['proxy_ip'] as $proxy_ip) {
1512         if ($remote != $proxy_ip) {
1513             continue;
1514         }
1515         // Take the last IP (the one which has been set by the defined proxy).
1516         return end($ip_list);
1517     }
1518     return $remote;
1519 }
1520
1521 /**
1522  * Convert hexadecimal string to base64
1523  */
1524 function hex_to_base64($hex)
1525 {
1526     $b = '';
1527     foreach (str_split($hex, 2) as $pair) {
1528         $b .= chr(hexdec($pair));
1529     }
1530     return base64_encode($b);
1531 }
1532
1533 /**
1534  * Replace markers in templates.
1535  *
1536  * Available markers have the scheme "###MARKERNAME###".
1537  *
1538  * @param $content string Template text with markers
1539  * @param $htmllinebreaks boolean Convert linebreaks to BR-Tags
1540  * @return Template with replaced markers
1541  */
1542 function jirafeau_replace_markers($content, $htmllinebreaks = false)
1543 {
1544     $patterns = array(
1545         '/###ORGANISATION###/',
1546         '/###CONTACTPERSON###/',
1547         '/###WEBROOT###/'
1548     );
1549     $replacements = array(
1550         $GLOBALS['cfg']['organisation'],
1551         $GLOBALS['cfg']['contactperson'],
1552         $GLOBALS['cfg']['web_root']
1553     );
1554     $content = preg_replace($patterns, $replacements, $content);
1555
1556     if (true === $htmllinebreaks) {
1557         $content = nl2br($content);
1558     }
1559
1560     return $content;
1561 }
1562
1563 function jirafeau_escape($string)
1564 {
1565     return htmlspecialchars($string, ENT_QUOTES);
1566 }
1567
1568 function jirafeau_admin_session_start()
1569 {
1570     $_SESSION['admin_auth'] = true;
1571     $_SESSION['admin_csrf'] = md5(uniqid(mt_rand(), true));
1572 }
1573
1574 function jirafeau_session_end()
1575 {
1576     $_SESSION = array();
1577     session_destroy();
1578 }
1579
1580 function jirafeau_admin_session_logged()
1581 {
1582     return isset($_SESSION['admin_auth']) &&
1583            isset($_SESSION['admin_csrf']) &&
1584            isset($_POST['admin_csrf']) &&
1585            $_SESSION['admin_auth'] === true &&
1586            $_SESSION['admin_csrf'] === $_POST['admin_csrf'];
1587 }
1588
1589 function jirafeau_admin_csrf_field()
1590 {
1591     return "<input type='hidden' name='admin_csrf' value='". $_SESSION['admin_csrf'] . "'/>";
1592 }
1593
1594 function jirafeau_user_session_start()
1595 {
1596     $_SESSION['user_auth'] = true;
1597 }
1598
1599 function jirafeau_user_session_logged()
1600 {
1601     return isset($_SESSION['user_auth']) &&
1602         $_SESSION['user_auth'] === true;
1603 }
1604
1605 function jirafeau_dir_size($dir)
1606 {
1607     $size = 0;
1608     foreach (glob(rtrim($dir, '/').'/*', GLOB_NOSORT) as $entry) {
1609         $size += is_file($entry) ? filesize($entry) : jirafeau_dir_size($entry);
1610     }
1611     return $size;
1612 }
1613
1614 function jirafeau_export_cfg($cfg)
1615 {
1616     $content = '<?php' . NL;
1617     $content .= '/* This file was generated by the install process. ' .
1618                'You can edit it. Please see config.original.php to understand the ' .
1619                'configuration items. */' . NL;
1620     $content .= '$cfg = ' . var_export($cfg, true) . ';';
1621
1622     $fileWrite = file_put_contents(JIRAFEAU_CFG, $content);
1623
1624     if (false === $fileWrite) {
1625         jirafeau_fatal_error(t('Can not write local configuration file'));
1626     }
1627 }
1628
1629 function jirafeau_mkdir($path)
1630 {
1631     return !(!file_exists($path) && !@mkdir($path, 0755));
1632 }
1633
1634 /**
1635  * Returns true whether the path is writable or we manage to make it
1636  * so, which essentially is the same thing.
1637  * @param $path is the file or directory to be tested.
1638  * @return true if $path is writable.
1639  */
1640 function jirafeau_is_writable($path)
1641 {
1642     /* "@" gets rid of error messages. */
1643     return is_writable($path) || @chmod($path, 0777);
1644 }
1645
1646 function jirafeau_check_var_dir($path)
1647 {
1648     $mkdir_str1 = t('CANNOT_CREATE_DIR') . ':';
1649     $mkdir_str2 = t('MANUAL_CREATE');
1650     $write_str1 = t('DIR_NOT_W') . ':';
1651     $write_str2 = t('You should give the write permission to the web server on ' .
1652                     'this directory.');
1653     $solution_str = t('HERE_SOLUTION') . ':';
1654
1655     if (!jirafeau_mkdir($path) || !jirafeau_is_writable($path)) {
1656         return array('has_error' => true,
1657                       'why' => $mkdir_str1 . '<br /><code>' .
1658                                $path . '</code><br />' . $solution_str .
1659                                '<br />' . $mkdir_str2);
1660     }
1661
1662     foreach (array('files', 'links', 'async') as $subdir) {
1663         $subpath = $path.$subdir;
1664
1665         if (!jirafeau_mkdir($subpath) || !jirafeau_is_writable($subpath)) {
1666             return array('has_error' => true,
1667                           'why' => $mkdir_str1 . '<br /><code>' .
1668                                    $subpath . '</code><br />' . $solution_str .
1669                                    '<br />' . $mkdir_str2);
1670         }
1671     }
1672
1673     return array('has_error' => false, 'why' => '');
1674 }
1675
1676 function jirafeau_add_ending_slash($path)
1677 {
1678     return $path . ((substr($path, -1) == '/') ? '' : '/');
1679 }
1680
1681 function jirafeau_default_web_root()
1682 {
1683     $url_scheme = (isset($_SERVER['HTTPS'])) ? 'https://' : 'http://';
1684     return $url_scheme . $_SERVER['HTTP_HOST'] . str_replace('install.php', '', $_SERVER['REQUEST_URI']);
1685 }
1686
1687 function jirafeau_get_download_stats($hash)
1688 {
1689     $filename = VAR_LINKS . s2p("$hash") . $hash . '_download';
1690
1691     if (!file_exists($filename)) {
1692         return array('count'=>0);
1693     }
1694
1695     $c = file($filename);
1696     $data['count'] = trim($c[0]);
1697     $data['date'] = trim($c[1]);
1698     $data['ip'] = trim($c[2]);
1699
1700     return $data;
1701 }
1702
1703 function jirafeau_write_download_stats($hash, $ip)
1704 {
1705     $data = jirafeau_get_download_stats($hash);
1706     $count = $data['count'];
1707     $count++;
1708
1709     $filename = VAR_LINKS . s2p("$hash") . $hash . '_download';
1710
1711     $handle = fopen($filename, 'w');
1712     fwrite($handle, $count . NL . time() . NL . $ip);
1713     fclose($handle);
1714 }