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