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('mcrypt') == true)) {
 458         error_log("PHP extension mcrypt not loaded, won't encrypt in Jirafeau");
 459     }
 460     if ($crypt == true && extension_loaded('mcrypt') == true) {
 461         $crypt_key = jirafeau_encrypt_file($file['tmp_name'], $file['tmp_name']);
 462         if (strlen($crypt_key) > 0) {
 463             $crypted = true;
 464         }
 465     }
 466
 467     /* file information */
 468     $hash = jirafeau_hash_file($file_hash_method, $file['tmp_name']);
 469     $name = str_replace(NL, '', trim($file['name']));
 470     $mime_type = $file['type'];
 471     $size = $file['size'];
 472
 473     /* does file already exist ? */
 474     $rc = false;
 475     $p = s2p("$hash");
 476     if (file_exists(VAR_FILES . $p .  $hash)) {
 477         $rc = unlink($file['tmp_name']);
 478     } elseif ((file_exists(VAR_FILES . $p) || @mkdir(VAR_FILES . $p, 0755, true))
 479             && move_uploaded_file($file['tmp_name'], VAR_FILES . $p . $hash)) {
 480         $rc = true;
 481     }
 482     if (!$rc) {
 483         return (array(
 484                  'error' =>
 485                    array('has_error' => true,
 486                           'why' => t('INTERNAL_ERROR_DEL')),
 487                  'link' =>'',
 488                  'delete_link' => ''));
 489     }
 490
 491     /* Increment or create count file. */
 492     $counter = 0;
 493     if (file_exists(VAR_FILES . $p . $hash . '_count')) {
 494         $content = file(VAR_FILES . $p . $hash. '_count');
 495         $counter = trim($content[0]);
 496     }
 497     $counter++;
 498     $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 499     fwrite($handle, $counter);
 500     fclose($handle);
 501
 502     /* Create delete code. */
 503     $delete_link_code = jirafeau_gen_random(5);
 504
 505     /* hash password or empty. */
 506     $password = '';
 507     if (!empty($key)) {
 508         $password = md5($key);
 509     }
 510
 511     /* create link file */
 512     $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
 513     $handle = fopen($link_tmp_name, 'w');
 514     fwrite(
 515         $handle,
 516         $name . NL. $mime_type . NL. $size . NL. $password . NL. $time .
 517             NL . $hash. NL . ($one_time_download ? 'O' : 'R') . NL . time() .
 518             NL . $ip . NL. $delete_link_code . NL . ($crypted ? 'C' : 'O')
 519     );
 520     fclose($handle);
 521     $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 522     $l = s2p("$hash_link");
 523     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 524         !rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
 525         if (file_exists($link_tmp_name)) {
 526             unlink($link_tmp_name);
 527         }
 528
 529         $counter--;
 530         if ($counter >= 1) {
 531             $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 532             fwrite($handle, $counter);
 533             fclose($handle);
 534         } else {
 535             jirafeau_clean_rm_file($hash_link);
 536         }
 537         return array(
 538                  'error' =>
 539                    array('has_error' => true,
 540                           'why' => t('Internal error during file creation. ')),
 541                  'link' =>'',
 542                  'delete_link' => '');
 543     }
 544     return array( 'error' => $noerr,
 545                   'link' => $hash_link,
 546                   'delete_link' => $delete_link_code,
 547                   'crypt_key' => $crypt_key);
 548 }
 549
 550 /**
 551  * Tells if a mime-type is viewable in a browser
 552  * @param $mime the mime type
 553  * @returns a boolean telling if a mime type is viewable
 554  */
 555 function jirafeau_is_viewable($mime)
 556 {
 557     if (!empty($mime)) {
 558         $viewable = array('image', 'video', 'audio');
 559         $decomposed = explode('/', $mime);
 560         if (in_array($decomposed[0], $viewable) && strpos($mime, 'image/svg+xml') === false) {
 561             return true;
 562         }
 563         $viewable = array('text/plain');
 564         if (in_array($mime, $viewable)) {
 565             return true;
 566         }
 567     }
 568     return false;
 569 }
 570
 571 // Error handling functions.
 572 //! Global array that contains all registered errors.
 573 $error_list = array();
 574
 575 /**
 576  * Adds an error to the list of errors.
 577  * @param $title the error's title
 578  * @param $description is a human-friendly description of the problem.
 579  */
 580 function add_error($title, $description)
 581 {
 582     global $error_list;
 583     $error_list[] = '<p>' . $title. '<br />' . $description. '</p>';
 584 }
 585
 586 /**
 587  * Informs whether any error has been registered yet.
 588  * @return true if there are errors.
 589  */
 590 function has_error()
 591 {
 592     global $error_list;
 593     return !empty($error_list);
 594 }
 595
 596 /**
 597  * Displays all the errors.
 598  */
 599 function show_errors()
 600 {
 601     if (has_error()) {
 602         global $error_list;
 603         echo '<div class="error">';
 604         foreach ($error_list as $error) {
 605             echo $error;
 606         }
 607         echo '</div>';
 608     }
 609 }
 610
 611 function check_errors($cfg)
 612 {
 613     if (!($cfg['installation_done'] === true)) {
 614         if (file_exists(JIRAFEAU_ROOT . 'install.php')) {
 615             header('Location: install.php');
 616             exit;
 617         } else {
 618             add_error(t('INSTALL_FILE_NOT_FOUND_TITLE'), t('INSTALL_FILE_NOT_FOUND_DESC'));
 619         }
 620     }
 621
 622     if (!is_writable(VAR_FILES)) {
 623         add_error(t('FILE_DIR_W'), VAR_FILES);
 624     }
 625
 626     if (!is_writable(VAR_LINKS)) {
 627         add_error(t('LINK_DIR_W'), VAR_LINKS);
 628     }
 629
 630     if (!is_writable(VAR_ASYNC)) {
 631         add_error(t('ASYNC_DIR_W'), VAR_ASYNC);
 632     }
 633
 634     if ($cfg['enable_crypt'] && $cfg['litespeed_workaround']) {
 635         add_error(t('INCOMPATIBLE_OPTIONS_W'), 'enable_crypt=true<br>litespeed_workaround=true');
 636     }
 637
 638     if ($cfg['one_time_download'] && $cfg['litespeed_workaround']) {
 639         add_error(t('INCOMPATIBLE_OPTIONS_W'), 'one_time_download=true<br>litespeed_workaround=true');
 640     }
 641 }
 642
 643 /**
 644  * Read link information
 645  * @return array containing information.
 646  */
 647 function jirafeau_get_link($hash)
 648 {
 649     $out = array();
 650     $link = VAR_LINKS . s2p("$hash") . $hash;
 651
 652     if (!file_exists($link)) {
 653         return $out;
 654     }
 655
 656     $c = file($link);
 657     $out['file_name'] = trim($c[0]);
 658     $out['mime_type'] = trim($c[1]);
 659     $out['file_size'] = trim($c[2]);
 660     $out['key'] = trim($c[3], NL);
 661     $out['time'] = trim($c[4]);
 662     $out['hash'] = trim($c[5]);
 663     $out['onetime'] = trim($c[6]);
 664     $out['upload_date'] = trim($c[7]);
 665     $out['ip'] = trim($c[8]);
 666     $out['link_code'] = trim($c[9]);
 667     $out['crypted'] = trim($c[10]) == 'C';
 668
 669     return $out;
 670 }
 671
 672 /**
 673  * List files in admin interface.
 674  */
 675 function jirafeau_admin_list($name, $file_hash, $link_hash)
 676 {
 677     echo '<fieldset><legend>';
 678     if (!empty($name)) {
 679         echo t('FILENAME') . ": " . jirafeau_escape($name);
 680     }
 681     if (!empty($file_hash)) {
 682         echo t('FILE') . ": " . jirafeau_escape($file_hash);
 683     }
 684     if (!empty($link_hash)) {
 685         echo t('LINK') . ": " . jirafeau_escape($link_hash);
 686     }
 687     if (empty($name) && empty($file_hash) && empty($link_hash)) {
 688         echo t('LS_FILES');
 689     }
 690     echo '</legend>';
 691     echo '<table>';
 692     echo '<tr>';
 693     echo '<th></th>';
 694     echo '<th>' . t('ACTION') . '</th>';
 695     echo '</tr>';
 696
 697     /* Get all links files. */
 698     $stack = array(VAR_LINKS);
 699     while (($d = array_shift($stack)) && $d != null) {
 700         $dir = scandir($d);
 701         foreach ($dir as $node) {
 702             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 703                 preg_match('/\.tmp/i', "$node")) {
 704                 continue;
 705             }
 706             if (is_dir($d . $node)) {
 707                 /* Push new found directory. */
 708                 $stack[] = $d . $node . '/';
 709             } elseif (is_file($d . $node)) {
 710                 /* Read link information. */
 711                 $l = jirafeau_get_link($node);
 712                 if (!count($l)) {
 713                     continue;
 714                 }
 715                 $ld = jirafeau_get_download_stats($node);
 716
 717                 /* Filter. */
 718                 if (!empty($name) && !@preg_match("/$name/i", jirafeau_escape($l['file_name']))) {
 719                     continue;
 720                 }
 721                 if (!empty($file_hash) && $file_hash != $l['hash']) {
 722                     continue;
 723                 }
 724                 if (!empty($link_hash) && $link_hash != $node) {
 725                     continue;
 726                 }
 727                 /* Print link information. */
 728                 echo '<tr>';
 729                 echo '<td>' .
 730                 '<strong><a id="upload_link" href="f.php?h='. jirafeau_escape($node) .'" title="' .
 731                     t('DL_PAGE') . '">' . jirafeau_escape($l['file_name']) . '</a></strong><br/>';
 732                 echo t('TYPE') . ': ' . jirafeau_escape($l['mime_type']) . '<br/>';
 733                 echo t('SIZE') . ': ' . jirafeau_human_size($l['file_size']) . '<br>';
 734                 echo t('EXPIRE') . ': ' . ($l['time'] == -1 ? '∞' : jirafeau_get_datetimefield($l['time'])) . '<br/>';
 735                 echo t('ONETIME') . ': ' . ($l['onetime'] == 'O' ? 'Yes' : 'No') . '<br/>';
 736                 echo t('UPLOAD_DATE') . ': ' . jirafeau_get_datetimefield($l['upload_date']) . '<br/>';
 737                 if (strlen($l['ip']) > 0) {
 738                     echo t('ORIGIN') . ': ' . $l['ip'] . '<br/>';
 739                 }
 740                 echo t('DOWNLOAD_COUNT') . ': ' . $ld['count'] . '<br/>';
 741                 if ($ld['count'] > 0) {
 742                     echo t('DOWNLOAD_DATE') . ': ' . jirafeau_get_datetimefield($ld['date']) . '<br/>';
 743                     echo t('DOWNLOAD_IP') . ': ' . $ld['ip'] . '<br/>';
 744                 }
 745                 echo '</td><td>';
 746                 echo '<form method="post">' .
 747                 '<input type = "hidden" name = "action" value = "download"/>' .
 748                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 749                 jirafeau_admin_csrf_field() .
 750                 '<input type = "submit" value = "' . t('DL') . '" />' .
 751                 '</form>' .
 752                 '<form method="post">' .
 753                 '<input type = "hidden" name = "action" value = "delete_link"/>' .
 754                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 755                 jirafeau_admin_csrf_field() .
 756                 '<input type = "submit" value = "' . t('DEL_LINK') . '" />' .
 757                 '</form>' .
 758                 '<form method="post">' .
 759                 '<input type = "hidden" name = "action" value = "delete_file"/>' .
 760                 '<input type = "hidden" name = "hash" value = "' . $l['hash'] . '"/>' .
 761                 jirafeau_admin_csrf_field() .
 762                 '<input type = "submit" value = "' . t('DEL_FILE_LINKS') . '" />' .
 763                 '</form>' .
 764                 '</td>';
 765                 echo '</tr>';
 766             }
 767         }
 768     }
 769     echo '</table></fieldset>';
 770 }
 771
 772 /**
 773  * Clean expired files.
 774  * @return number of cleaned files.
 775  */
 776 function jirafeau_admin_clean()
 777 {
 778     $count = 0;
 779     /* Get all links files. */
 780     $stack = array(VAR_LINKS);
 781     while (($d = array_shift($stack)) && $d != null) {
 782         $dir = scandir($d);
 783
 784         foreach ($dir as $node) {
 785             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 786                 preg_match('/\.tmp/i', "$node")) {
 787                 continue;
 788             }
 789
 790             if (is_dir($d . $node)) {
 791                 /* Push new found directory. */
 792                 $stack[] = $d . $node . '/';
 793             } elseif (is_file($d . $node)) {
 794                 /* Read link information. */
 795                 $l = jirafeau_get_link(basename($node));
 796                 if (!count($l)) {
 797                     continue;
 798                 }
 799                 $p = s2p($l['hash']);
 800                 if ($l['time'] > 0 && $l['time'] < time() || // expired
 801                     !file_exists(VAR_FILES . $p . $l['hash']) || // invalid
 802                     !file_exists(VAR_FILES . $p . $l['hash'] . '_count')) { // invalid
 803                     jirafeau_delete_link($node);
 804                     $count++;
 805                 }
 806             }
 807         }
 808     }
 809     return $count;
 810 }
 811
 812
 813 /**
 814  * Clean old async transfers.
 815  * @return number of cleaned files.
 816  */
 817 function jirafeau_admin_clean_async()
 818 {
 819     $count = 0;
 820     /* Get all links files. */
 821     $stack = array(VAR_ASYNC);
 822     while (($d = array_shift($stack)) && $d != null) {
 823         $dir = scandir($d);
 824
 825         foreach ($dir as $node) {
 826             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 827                 preg_match('/\.tmp/i', "$node")) {
 828                 continue;
 829             }
 830
 831             if (is_dir($d . $node)) {
 832                 /* Push new found directory. */
 833                 $stack[] = $d . $node . '/';
 834             } elseif (is_file($d . $node)) {
 835                 /* Read async information. */
 836                 $a = jirafeau_get_async_ref(basename($node));
 837                 if (!count($a)) {
 838                     continue;
 839                 }
 840                 /* Delete transfers older than 1 hour. */
 841                 if (time() - $a['last_edited'] > 3600) {
 842                     jirafeau_async_delete(basename($node));
 843                     $count++;
 844                 }
 845             }
 846         }
 847     }
 848     return $count;
 849 }
 850
 851 /**
 852  * Better strval function for debug purposes
 853  */
 854 function jirafeau_strval($value)
 855 {
 856     if (gettype($value) == "boolean") {
 857         return $value ? 'true' : 'false';
 858     }
 859     return strval($value);
 860 }
 861
 862 /**
 863  * Show file/folder permissions
 864  */
 865 function jirafeau_fileperms($path)
 866 {
 867     $out = substr(sprintf("%o", @fileperms($path)), -4) . ", ";
 868     $out .= "read " . (is_readable($path) ? "OK" : "KO") . ", ";
 869     $out .= "write " . (is_writable($path) ? "OK" : "KO");
 870     return $out;
 871 }
 872
 873 /**
 874  * Show some useful informations for bug reporting.
 875  */
 876 function jirafeau_admin_bug_report($cfg)
 877 {
 878     $out = "<fieldset><legend>" . t('REPORTING_AN_ISSUE') . "</legend>";
 879     $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>";
 880
 881     $out .= "# Jirafeau<br/>";
 882     $out .= "- version: " . JIRAFEAU_VERSION . "<br/>";
 883     $jirafeau_options = [
 884         'debug',
 885         'file_hash',
 886         'litespeed_workaround',
 887         'store_uploader_ip',
 888         'installation_done',
 889         'enable_crypt',
 890         'preview',
 891         'maximal_upload_size',
 892         'store_uploader_ip',
 893         'max_upload_chunk_size_bytes'
 894     ];
 895     foreach ($jirafeau_options as &$o) {
 896         $v = $cfg[$o];
 897         $out .= "- $o: " . jirafeau_strval($v) . " (" . gettype($v) . ")<br/>";
 898     }
 899     $out .= "<br/>";
 900
 901     $out .= "# PHP options<br/>";
 902     $out .= "- php version: " . phpversion() . "<br/>";
 903     $out .= "- mcrypt version: " . phpversion('mcrypt') . "<br/>";
 904     $php_options =  [
 905         'post_max_size',
 906         'upload_max_filesize',
 907         'safe_mode',
 908         'max_execution_time',
 909         'max_input_time'
 910     ];
 911     foreach ($php_options as &$o) {
 912         $v = ini_get($o);
 913         $out .= "- $o: " . jirafeau_strval($v) . " (" . gettype($v). ")<br/>";
 914     }
 915     $out .= "- can set_time_limit: " . (set_time_limit(0) ? "yes" : "no") . "<br/>";
 916     $out .= "<br/>";
 917
 918     $out .= "# File permissions<br/>";
 919     $out .= "- 'var' folder permissions: " . jirafeau_fileperms($cfg['var_root']) . "<br/>";
 920     $out .= "- 'file' folder permissions: " . jirafeau_fileperms(VAR_FILES) . "<br/>";
 921     $out .= "- 'links' folder permissions: " . jirafeau_fileperms(VAR_LINKS) . "<br/>";
 922     $out .= "- 'async' folder permissions: " . jirafeau_fileperms(VAR_ASYNC) . "<br/>";
 923     $out .= "<br/>";
 924
 925     $out .= "# Server details<br/>";
 926     $out .= "- server software: " . $_SERVER["SERVER_SOFTWARE"] . "<br/>";
 927     $out .= "<br/>";
 928
 929     $out .= "# OS details<br/>";
 930     $out .= "- OS: " . php_uname() . "<br/>";
 931     $out .= "<br/>";
 932
 933     $out .= "# Browser details<br/>";
 934     $out .= "<script type='text/javascript' lang='Javascript'>
 935         // @license magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt AGPL-v3-or-Later
 936         document.write('- html5 support: ' + (check_html5_file_api() ? 'yes' : 'no') + '<br/>');
 937         document.write('- user agent: ' + navigator.userAgent + '<br/>');
 938         // @license-end
 939         </script>";
 940     $out .= "<br/>";
 941
 942     $out .= "# Memory<br/>";
 943     $out .= "- memory_get_peak_usage: " . jirafeau_human_size(memory_get_peak_usage()) . "<br/>";
 944
 945     $out .= "</code></fieldset>";
 946     return $out;
 947 }
 948
 949 /**
 950  * Read async transfer information
 951  * @return array containing information.
 952  */
 953 function jirafeau_get_async_ref($ref)
 954 {
 955     $out = array();
 956     $refinfos = VAR_ASYNC . s2p("$ref") . "$ref";
 957
 958     if (!file_exists($refinfos)) {
 959         return $out;
 960     }
 961
 962     $c = file($refinfos);
 963     $out['file_name'] = trim($c[0]);
 964     $out['mime_type'] = trim($c[1]);
 965     $out['key'] = trim($c[2], NL);
 966     $out['time'] = trim($c[3]);
 967     $out['onetime'] = trim($c[4]);
 968     $out['ip'] = trim($c[5]);
 969     $out['last_edited'] = trim($c[6]);
 970     $out['next_code'] = trim($c[7]);
 971     return $out;
 972 }
 973
 974 /**
 975  * Delete async transfer information
 976  */
 977 function jirafeau_async_delete($ref)
 978 {
 979     $p = s2p("$ref");
 980     if (file_exists(VAR_ASYNC . $p . $ref)) {
 981         unlink(VAR_ASYNC . $p . $ref);
 982     }
 983     if (file_exists(VAR_ASYNC . $p . $ref . '_data')) {
 984         unlink(VAR_ASYNC . $p . $ref . '_data');
 985     }
 986     $parse = VAR_ASYNC . $p;
 987     $scan = array();
 988     while (file_exists($parse)
 989            && ($scan = scandir($parse))
 990            && count($scan) == 2 // '.' and '..' folders => empty.
 991            && basename($parse) != basename(VAR_ASYNC)) {
 992         rmdir($parse);
 993         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 994     }
 995 }
 996
 997 /**
 998   * Init a new asynchronous upload.
 999   * @param $filename Name of the file to send
1000   * @param $one_time One time upload parameter
1001   * @param $key eventual password (or blank)
1002   * @param $time time limit
1003   * @param $ip ip address of the client
1004   * @return a string containing a temporary reference followed by a code or a string starting with 'Error'
1005   */
1006 function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
1007 {
1008     /* Create temporary folder. */
1009     $ref;
1010     $p;
1011     $code = jirafeau_gen_random(4);
1012     do {
1013         $ref = jirafeau_gen_random(32);
1014         $p = VAR_ASYNC . s2p($ref);
1015     } while (file_exists($p));
1016     @mkdir($p, 0755, true);
1017     if (!file_exists($p)) {
1018         return 'Error: cannot create async folder.';
1019     }
1020
1021     /* touch empty data file */
1022     $w_path = $p . $ref . '_data';
1023     touch($w_path);
1024
1025     /* md5 password or empty */
1026     $password = '';
1027     if (!empty($key)) {
1028         $password = md5($key);
1029     }
1030
1031     /* Store information. */
1032     $p .= $ref;
1033     $handle = fopen($p, 'w');
1034     fwrite(
1035         $handle,
1036         str_replace(NL, '', trim($filename)) . NL .
1037             str_replace(NL, '', trim($type)) . NL . $password . NL .
1038             $time . NL . ($one_time ? 'O' : 'R') . NL . $ip . NL .
1039             time() . NL . $code . NL
1040     );
1041     fclose($handle);
1042
1043     return $ref . NL . $code ;
1044 }
1045
1046 /**
1047   * Append a piece of file on the asynchronous upload.
1048   * @param $ref asynchronous upload reference
1049   * @param $file piece of data
1050   * @param $code client code for this operation
1051   * @param $max_file_size maximum allowed file size
1052   * @return a string containing a next code to use or a string starting with 'Error'
1053   */
1054 function jirafeau_async_push($ref, $data, $code, $max_file_size)
1055 {
1056     /* Get async infos. */
1057     $a = jirafeau_get_async_ref($ref);
1058
1059     /* Check some errors. */
1060     if (count($a) == 0) {
1061         return "Error: cannot find transfer";
1062     }
1063     if ($a['next_code'] != "$code") {
1064         return "Error: bad transfer code";
1065     }
1066     if ($data['error'] != UPLOAD_ERR_OK) {
1067         // Check error code in https://www.php.net/manual/en/features.file-upload.errors.php
1068         $data_details = print_r($data, true);
1069         return "Error: upload error: {$data_details}";
1070     }
1071     if (empty($data['tmp_name'])) {
1072         return "Error: missing tmp_name";
1073     }
1074     if (!is_uploaded_file($data['tmp_name'])) {
1075         return "Error: tmp_name may not be uploaded";
1076     }
1077
1078     $p = s2p($ref);
1079
1080     /* File path. */
1081     $r_path = $data['tmp_name'];
1082     $w_path = VAR_ASYNC . $p . $ref . '_data';
1083
1084     /* Check that file size is not above upload limit. */
1085     if ($max_file_size > 0 &&
1086         filesize($r_path) + filesize($w_path) > $max_file_size * 1024 * 1024) {
1087         jirafeau_async_delete($ref);
1088         return "Error: file size is above upload limit";
1089     }
1090
1091     /* Concatenate data. */
1092     $r = fopen($r_path, 'r');
1093     $w = fopen($w_path, 'a');
1094     while (!feof($r)) {
1095         if (fwrite($w, fread($r, 1024)) === false) {
1096             fclose($r);
1097             fclose($w);
1098             jirafeau_async_delete($ref);
1099             return "Error: cannot write file";
1100         }
1101     }
1102     fclose($r);
1103     fclose($w);
1104     unlink($r_path);
1105
1106     /* Update async file. */
1107     $code = jirafeau_gen_random(4);
1108     $handle = fopen(VAR_ASYNC . $p . $ref, 'w');
1109     fwrite(
1110         $handle,
1111         $a['file_name'] . NL. $a['mime_type'] . NL. $a['key'] . NL .
1112             $a['time'] . NL . $a['onetime'] . NL . $a['ip'] . NL .
1113             time() . NL . $code . NL
1114     );
1115     fclose($handle);
1116     return $code;
1117 }
1118
1119 /**
1120   * Finalize an asynchronous upload.
1121   * @param $ref asynchronous upload reference
1122   * @param $code client code for this operation
1123   * @param $crypt boolean asking to crypt or not
1124   * @param $link_name_length link name length
1125   * @return a string containing the download reference followed by a delete code or a string starting with 'Error'
1126   */
1127 function jirafeau_async_end($ref, $code, $crypt, $link_name_length, $file_hash_method)
1128 {
1129     /* Get async infos. */
1130     $a = jirafeau_get_async_ref($ref);
1131     if (count($a) == 0
1132         || $a['next_code'] != "$code") {
1133         return "Error: bad code for ending transfer";
1134     }
1135
1136     /* Generate link infos. */
1137     $p = VAR_ASYNC . s2p($ref) . $ref . "_data";
1138     if (!file_exists($p)) {
1139         return "Error: referenced file does not exist";
1140     }
1141
1142     $crypted = false;
1143     $crypt_key = '';
1144     if ($crypt == true && extension_loaded('mcrypt') == true) {
1145         $crypt_key = jirafeau_encrypt_file($p, $p);
1146         if (strlen($crypt_key) > 0) {
1147             $crypted = true;
1148         }
1149     }
1150
1151     $hash = jirafeau_hash_file($file_hash_method, $p);
1152     $size = filesize($p);
1153     $np = s2p($hash);
1154     $delete_link_code = jirafeau_gen_random(5);
1155
1156     /* File already exist ? */
1157     if (!file_exists(VAR_FILES . $np)) {
1158         @mkdir(VAR_FILES . $np, 0755, true);
1159     }
1160     if (!file_exists(VAR_FILES . $np . $hash)) {
1161         rename($p, VAR_FILES . $np . $hash);
1162     }
1163
1164     /* Increment or create count file. */
1165     $counter = 0;
1166     if (file_exists(VAR_FILES . $np . $hash . '_count')) {
1167         $content = file(VAR_FILES . $np . $hash. '_count');
1168         $counter = trim($content[0]);
1169     }
1170     $counter++;
1171     $handle = fopen(VAR_FILES . $np . $hash. '_count', 'w');
1172     fwrite($handle, $counter);
1173     fclose($handle);
1174
1175     /* Create link. */
1176     $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
1177     $handle = fopen($link_tmp_name, 'w');
1178     fwrite(
1179         $handle,
1180         $a['file_name'] . NL . $a['mime_type'] . NL . $size . NL .
1181             $a['key'] . NL . $a['time'] . NL . $hash . NL . $a['onetime'] . NL .
1182             time() . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C' : 'O')
1183     );
1184     fclose($handle);
1185     $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
1186     $l = s2p("$hash_link");
1187     if (!@mkdir(VAR_LINKS . $l, 0755, true)) {
1188         return "Error: cannot create folder in LINKS";
1189     }
1190     if (!rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
1191         return "Error: cannot rename file in LINKS";
1192     }
1193
1194     /* Clean async upload. */
1195     jirafeau_async_delete($ref);
1196     return $hash_link . NL . $delete_link_code . NL . urlencode($crypt_key);
1197 }
1198
1199 function jirafeau_crypt_create_iv($base, $size)
1200 {
1201     $iv = '';
1202     while (strlen($iv) < $size) {
1203         $iv = $iv . $base;
1204     }
1205     $iv = substr($iv, 0, $size);
1206     return $iv;
1207 }
1208
1209 /**
1210  * Crypt file and returns decrypt key.
1211  * @param $fp_src file path to the file to crypt.
1212  * @param $fp_dst file path to the file to write crypted file (could be the same).
1213  * @return decrypt key composed of the key and the iv separated by a point ('.')
1214  */
1215 function jirafeau_encrypt_file($fp_src, $fp_dst)
1216 {
1217     $fs = filesize($fp_src);
1218     if ($fs === false || $fs == 0 || !(extension_loaded('mcrypt') == true)) {
1219         return '';
1220     }
1221
1222     /* Prepare module. */
1223     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1224     /* Generate key. */
1225     $crypt_key = jirafeau_gen_random(10);
1226     $hash_key = md5($crypt_key);
1227     $iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
1228     /* Init module. */
1229     mcrypt_generic_init($m, $hash_key, $iv);
1230     /* Crypt file. */
1231     $r = fopen($fp_src, 'r');
1232     $w = fopen($fp_dst, 'c');
1233     while (!feof($r)) {
1234         $to_enc = fread($r, 1024);
1235         if (strlen($to_enc) > 0) {
1236             $enc = mcrypt_generic($m, $to_enc);
1237             if (fwrite($w, $enc) === false) {
1238                 return '';
1239             }
1240         }
1241     }
1242     fclose($r);
1243     fclose($w);
1244     /* Cleanup. */
1245     mcrypt_generic_deinit($m);
1246     mcrypt_module_close($m);
1247     return $crypt_key;
1248 }
1249
1250 /**
1251  * Decrypt file.
1252  * @param $fp_src file path to the file to decrypt.
1253  * @param $fp_dst file path to the file to write decrypted file (could be the same).
1254  * @param $k string composed of the key and the iv separated by a point ('.')
1255  * @return key used to decrypt. a string of length 0 is returned if failed.
1256  */
1257 function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
1258 {
1259     $fs = filesize($fp_src);
1260     if ($fs === false || $fs == 0 || extension_loaded('mcrypt') == false) {
1261         return false;
1262     }
1263
1264     /* Init module */
1265     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1266     /* Extract key and iv. */
1267     $crypt_key = $k;
1268     $hash_key = md5($crypt_key);
1269     $iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
1270     /* Decrypt file. */
1271     $r = fopen($fp_src, 'r');
1272     $w = fopen($fp_dst, 'c');
1273     while (!feof($r)) {
1274         $dec = mdecrypt_generic($m, fread($r, 1024));
1275         if (fwrite($w, $dec) === false) {
1276             return false;
1277         }
1278     }
1279     fclose($r);
1280     fclose($w);
1281     /* Cleanup. */
1282     mcrypt_generic_deinit($m);
1283     mcrypt_module_close($m);
1284     return true;
1285 }
1286
1287 /**
1288  * Check if Jirafeau is password protected for visitors.
1289  * @return true if Jirafeau is password protected, false otherwise.
1290  */
1291 function jirafeau_has_upload_password($cfg)
1292 {
1293     return count($cfg['upload_password']) > 0;
1294 }
1295
1296 /**
1297  * Challenge password for a visitor.
1298  * @param $password password to be challenged
1299  * @return true if password is valid, false otherwise.
1300  */
1301 function jirafeau_challenge_upload_password($cfg, $password)
1302 {
1303     if (!jirafeau_has_upload_password($cfg)) {
1304         return false;
1305     }
1306     foreach ($cfg['upload_password'] as $p) {
1307         if ($password == $p) {
1308             return true;
1309         }
1310     }
1311     return false;
1312 }
1313
1314 /**
1315  * Test if the given IP is whitelisted by the given list.
1316  *
1317  * @param $allowedIpList array of allowed IPs
1318  * @param $challengedIp IP to be challenged
1319  * @return true if IP is authorized, false otherwise.
1320  */
1321 function jirafeau_challenge_ip($allowedIpList, $challengedIp)
1322 {
1323     foreach ($allowedIpList as $i) {
1324         if ($i == $challengedIp) {
1325             return true;
1326         }
1327         // CIDR test for IPv4 only.
1328         if (strpos($i, '/') !== false) {
1329             list($subnet, $mask) = explode('/', $i);
1330             if ((ip2long($challengedIp) & ~((1 << (32 - $mask)) - 1)) == ip2long($subnet)) {
1331                 return true;
1332             }
1333         }
1334     }
1335     return false;
1336 }
1337
1338 /**
1339  * Check if Jirafeau has a restriction on the IP address for uploading.
1340  * @return true if uploading is IP restricted, false otherwise.
1341  */
1342 function jirafeau_upload_has_ip_restriction($cfg)
1343 {
1344     return count($cfg['upload_ip']) > 0;
1345 }
1346
1347 /**
1348  * Test if visitor's IP is authorized to upload at all.
1349  *
1350  * @param $cfg configuration
1351  * @param $challengedIp IP to be challenged
1352  * @return true if IP is authorized, false otherwise.
1353  */
1354 function jirafeau_challenge_upload_ip($cfg, $challengedIp)
1355 {
1356     // If no IP address have been listed, allow upload from any IP
1357     if (!jirafeau_upload_has_ip_restriction($cfg)) {
1358         return true;
1359     }
1360     return jirafeau_challenge_ip($cfg['upload_ip'], $challengedIp);
1361 }
1362
1363 /**
1364  * Test if visitor's IP is authorized to upload without a password.
1365  *
1366  * @param $cfg configuration
1367  * @param $challengedIp IP to be challenged
1368  * @return true if IP is authorized, false otherwise.
1369  */
1370 function jirafeau_challenge_upload_ip_without_password($cfg, $challengedIp)
1371 {
1372     return jirafeau_challenge_ip($cfg['upload_ip_nopassword'], $challengedIp);
1373 }
1374
1375 /**
1376  * Test if visitor's IP is authorized or password is supplied and authorized
1377  * @param $ip IP to be challenged
1378  * @param $password password to be challenged
1379  * @return true if access is valid, false otherwise.
1380  */
1381 function jirafeau_challenge_upload($cfg, $ip, $password)
1382 {
1383     return jirafeau_challenge_upload_ip_without_password($cfg, $ip) ||
1384             (!jirafeau_has_upload_password($cfg) && !jirafeau_upload_has_ip_restriction($cfg)) ||
1385             (jirafeau_challenge_upload_password($cfg, $password) && jirafeau_challenge_upload_ip($cfg, $ip));
1386 }
1387
1388 /** Tell if we have some HTTP headers generated by a proxy */
1389 function has_http_forwarded()
1390 {
1391     return
1392         !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ||
1393         !empty($_SERVER['http_X_forwarded_for']);
1394 }
1395
1396 /**
1397  * Generate IP list from HTTP headers generated by a proxy
1398  * @return  array of IP strings
1399  */
1400 function get_ip_list_http_forwarded()
1401 {
1402     $ip_list = array();
1403     if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
1404         $l = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
1405         if ($l === false) {
1406             return array();
1407         }
1408         foreach ($l as $ip) {
1409             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1410         }
1411     }
1412     if (!empty($_SERVER['http_X_forwarded_for'])) {
1413         $l = explode(',', $_SERVER['http_X_forwarded_for']);
1414         foreach ($l as $ip) {
1415             // Separate IP from port
1416             $ipa = explode(':', $ip);
1417             if ($ipa === false) {
1418                 continue;
1419             }
1420             $ip = $ipa[0];
1421             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1422         }
1423     }
1424     return $ip_list;
1425 }
1426
1427 /**
1428  * Get the ip address of the client from REMOTE_ADDR
1429  * or from HTTP_X_FORWARDED_FOR if behind a proxy
1430  * @returns the client ip address
1431  */
1432 function get_ip_address($cfg)
1433 {
1434     $remote = $_SERVER['REMOTE_ADDR'];
1435     if (count($cfg['proxy_ip']) == 0 || !has_http_forwarded()) {
1436         return $remote;
1437     }
1438
1439     $ip_list = get_ip_list_http_forwarded();
1440     if (count($ip_list) == 0) {
1441         return $remote;
1442     }
1443
1444     foreach ($cfg['proxy_ip'] as $proxy_ip) {
1445         if ($remote != $proxy_ip) {
1446             continue;
1447         }
1448         // Take the last IP (the one which has been set by the defined proxy).
1449         return end($ip_list);
1450     }
1451     return $remote;
1452 }
1453
1454 /**
1455  * Convert hexadecimal string to base64
1456  */
1457 function hex_to_base64($hex)
1458 {
1459     $b = '';
1460     foreach (str_split($hex, 2) as $pair) {
1461         $b .= chr(hexdec($pair));
1462     }
1463     return base64_encode($b);
1464 }
1465
1466 /**
1467  * Replace markers in templates.
1468  *
1469  * Available markers have the scheme "###MARKERNAME###".
1470  *
1471  * @param $content string Template text with markers
1472  * @param $htmllinebreaks boolean Convert linebreaks to BR-Tags
1473  * @return Template with replaced markers
1474  */
1475 function jirafeau_replace_markers($content, $htmllinebreaks = false)
1476 {
1477     $patterns = array(
1478         '/###ORGANISATION###/',
1479         '/###CONTACTPERSON###/',
1480         '/###WEBROOT###/'
1481     );
1482     $replacements = array(
1483         $GLOBALS['cfg']['organisation'],
1484         $GLOBALS['cfg']['contactperson'],
1485         $GLOBALS['cfg']['web_root']
1486     );
1487     $content = preg_replace($patterns, $replacements, $content);
1488
1489     if (true === $htmllinebreaks) {
1490         $content = nl2br($content);
1491     }
1492
1493     return $content;
1494 }
1495
1496 function jirafeau_escape($string)
1497 {
1498     return htmlspecialchars($string, ENT_QUOTES);
1499 }
1500
1501 function jirafeau_admin_session_start()
1502 {
1503     $_SESSION['admin_auth'] = true;
1504     $_SESSION['admin_csrf'] = md5(uniqid(mt_rand(), true));
1505 }
1506
1507 function jirafeau_session_end()
1508 {
1509     $_SESSION = array();
1510     session_destroy();
1511 }
1512
1513 function jirafeau_admin_session_logged()
1514 {
1515     return isset($_SESSION['admin_auth']) &&
1516            isset($_SESSION['admin_csrf']) &&
1517            isset($_POST['admin_csrf']) &&
1518            $_SESSION['admin_auth'] === true &&
1519            $_SESSION['admin_csrf'] === $_POST['admin_csrf'];
1520 }
1521
1522 function jirafeau_admin_csrf_field()
1523 {
1524     return "<input type='hidden' name='admin_csrf' value='". $_SESSION['admin_csrf'] . "'/>";
1525 }
1526
1527 function jirafeau_user_session_start()
1528 {
1529     $_SESSION['user_auth'] = true;
1530 }
1531
1532 function jirafeau_user_session_logged()
1533 {
1534     return isset($_SESSION['user_auth']) &&
1535         $_SESSION['user_auth'] === true;
1536 }
1537
1538 function jirafeau_dir_size($dir)
1539 {
1540     $size = 0;
1541     foreach (glob(rtrim($dir, '/').'/*', GLOB_NOSORT) as $entry) {
1542         $size += is_file($entry) ? filesize($entry) : jirafeau_dir_size($entry);
1543     }
1544     return $size;
1545 }
1546
1547 function jirafeau_export_cfg($cfg)
1548 {
1549     $content = '<?php' . NL;
1550     $content .= '/* This file was generated by the install process. ' .
1551                'You can edit it. Please see config.original.php to understand the ' .
1552                'configuration items. */' . NL;
1553     $content .= '$cfg = ' . var_export($cfg, true) . ';';
1554
1555     $fileWrite = file_put_contents(JIRAFEAU_CFG, $content);
1556
1557     if (false === $fileWrite) {
1558         jirafeau_fatal_error(t('Can not write local configuration file'));
1559     }
1560 }
1561
1562 function jirafeau_mkdir($path)
1563 {
1564     return !(!file_exists($path) && !@mkdir($path, 0755));
1565 }
1566
1567 /**
1568  * Returns true whether the path is writable or we manage to make it
1569  * so, which essentially is the same thing.
1570  * @param $path is the file or directory to be tested.
1571  * @return true if $path is writable.
1572  */
1573 function jirafeau_is_writable($path)
1574 {
1575     /* "@" gets rid of error messages. */
1576     return is_writable($path) || @chmod($path, 0777);
1577 }
1578
1579 function jirafeau_check_var_dir($path)
1580 {
1581     $mkdir_str1 = t('CANNOT_CREATE_DIR') . ':';
1582     $mkdir_str2 = t('MANUAL_CREATE');
1583     $write_str1 = t('DIR_NOT_W') . ':';
1584     $write_str2 = t('You should give the write permission to the web server on ' .
1585                     'this directory.');
1586     $solution_str = t('HERE_SOLUTION') . ':';
1587
1588     if (!jirafeau_mkdir($path) || !jirafeau_is_writable($path)) {
1589         return array('has_error' => true,
1590                       'why' => $mkdir_str1 . '<br /><code>' .
1591                                $path . '</code><br />' . $solution_str .
1592                                '<br />' . $mkdir_str2);
1593     }
1594
1595     foreach (array('files', 'links', 'async') as $subdir) {
1596         $subpath = $path.$subdir;
1597
1598         if (!jirafeau_mkdir($subpath) || !jirafeau_is_writable($subpath)) {
1599             return array('has_error' => true,
1600                           'why' => $mkdir_str1 . '<br /><code>' .
1601                                    $subpath . '</code><br />' . $solution_str .
1602                                    '<br />' . $mkdir_str2);
1603         }
1604     }
1605
1606     return array('has_error' => false, 'why' => '');
1607 }
1608
1609 function jirafeau_add_ending_slash($path)
1610 {
1611     return $path . ((substr($path, -1) == '/') ? '' : '/');
1612 }
1613
1614 function jirafeau_default_web_root()
1615 {
1616     return $_SERVER['HTTP_HOST'] . str_replace('install.php', '', $_SERVER['REQUEST_URI']);
1617 }
1618
1619 function jirafeau_get_download_stats($hash)
1620 {
1621     $filename = VAR_LINKS . s2p("$hash") . $hash . '_download';
1622
1623     if (!file_exists($filename)) {
1624         return array('count'=>0);
1625     }
1626
1627     $c = file($filename);
1628     $data['count'] = trim($c[0]);
1629     $data['date'] = trim($c[1]);
1630     $data['ip'] = trim($c[2]);
1631
1632     return $data;
1633 }
1634
1635 function jirafeau_write_download_stats($hash, $ip)
1636 {
1637     $data = jirafeau_get_download_stats($hash);
1638     $count = $data['count'];
1639     $count++;
1640
1641     $filename = VAR_LINKS . s2p("$hash") . $hash . '_download';
1642
1643     $handle = fopen($filename, 'w');
1644     fwrite($handle, $count . NL . time() . NL . $ip);
1645     fclose($handle);
1646 }