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 <j.jutteau@gmail.com>
   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 seperating each letters by a '/'.
  24  * @return path finishing with a '/'
  25  */
  26 function s2p($s)
  27 {
  28     $p = '';
  29     for ($i = 0; $i < strlen($s); $i++) {
  30         $p .= $s{$i} . '/';
  31     }
  32     return $p;
  33 }
  34
  35 /**
  36  * Convert base 16 to base 64
  37  * @returns A string based on 64 characters (0-9, a-z, A-Z, "-" and "_")
  38  */
  39 function base_16_to_64($num)
  40 {
  41     $m = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_';
  42     $hex2bin = array('0000',  # 0
  43                       '0001',  # 1
  44                       '0010',  # 2
  45                       '0011',  # 3
  46                       '0100',  # 4
  47                       '0101',  # 5
  48                       '0110',  # 6
  49                       '0111',  # 7
  50                       '1000',  # 8
  51                       '1001',  # 9
  52                       '1010',  # a
  53                       '1011',  # b
  54                       '1100',  # c
  55                       '1101',  # d
  56                       '1110',  # e
  57                       '1111'); # f
  58     $o = '';
  59     $b = '';
  60     $i = 0;
  61     # Convert long hex string to bin.
  62     $size = strlen($num);
  63     for ($i = 0; $i < $size; $i++) {
  64         $b .= $hex2bin{hexdec($num{$i})};
  65     }
  66     # Convert long bin to base 64.
  67     $size *= 4;
  68     for ($i = $size - 6; $i >= 0; $i -= 6) {
  69         $o = $m{bindec(substr($b, $i, 6))} . $o;
  70     }
  71     # Some few bits remaining ?
  72     if ($i < 0 && $i > -6) {
  73         $o = $m{bindec(substr($b, 0, $i + 6))} . $o;
  74     }
  75     return $o;
  76 }
  77
  78 /**
  79   * Generate a random code.
  80   * @param $l code length
  81   * @return  random code.
  82   */
  83 function jirafeau_gen_random($l)
  84 {
  85     if ($l <= 0) {
  86         return 42;
  87     }
  88
  89     $code="";
  90     for ($i = 0; $i < $l; $i++) {
  91         $code .= dechex(rand(0, 15));
  92     }
  93
  94     return $code;
  95 }
  96
  97 function is_ssl()
  98 {
  99     if (isset($_SERVER['HTTPS'])) {
 100         if ('on' == strtolower($_SERVER['HTTPS']) ||
 101              '1' == $_SERVER['HTTPS']) {
 102             return true;
 103         }
 104     } elseif (isset($_SERVER['SERVER_PORT']) && ('443' == $_SERVER['SERVER_PORT'])) {
 105         return true;
 106     } elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
 107         if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
 108             return true;
 109         }
 110     }
 111     return false;
 112 }
 113
 114 function jirafeau_human_size($octets)
 115 {
 116     $u = array('B', 'KB', 'MB', 'GB', 'TB');
 117     $o = max($octets, 0);
 118     $p = min(floor(($o ? log($o) : 0) / log(1024)), count($u) - 1);
 119     $o /= pow(1024, $p);
 120     return round($o, 1) . $u[$p];
 121 }
 122
 123 // Convert UTC timestamp to a datetime field
 124 function jirafeau_get_datetimefield($timestamp)
 125 {
 126     $content = '<span class="datetime" data-datetime="' . strftime('%Y-%m-%d %H:%M', $timestamp) . '">'
 127         . strftime('%Y-%m-%d %H:%M', $timestamp) . ' (GMT)</span>';
 128     return $content;
 129 }
 130
 131 function jirafeau_fatal_error($errorText, $cfg = array())
 132 {
 133     echo '<div class="error"><h2>Error</h2><p>' . $errorText . '</p></div>';
 134     require(JIRAFEAU_ROOT . 'lib/template/footer.php');
 135     exit;
 136 }
 137
 138 function jirafeau_clean_rm_link($link)
 139 {
 140     $p = s2p("$link");
 141     if (file_exists(VAR_LINKS . $p . $link)) {
 142         unlink(VAR_LINKS . $p . $link);
 143     }
 144     $parse = VAR_LINKS . $p;
 145     $scan = array();
 146     while (file_exists($parse)
 147            && ($scan = scandir($parse))
 148            && count($scan) == 2 // '.' and '..' folders => empty.
 149            && basename($parse) != basename(VAR_LINKS)) {
 150         rmdir($parse);
 151         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 152     }
 153 }
 154
 155 function jirafeau_clean_rm_file($md5)
 156 {
 157     $p = s2p("$md5");
 158     $f = VAR_FILES . $p . $md5;
 159     if (file_exists($f) && is_file($f)) {
 160         unlink($f);
 161     }
 162     if (file_exists($f . '_count') && is_file($f . '_count')) {
 163         unlink($f . '_count');
 164     }
 165     $parse = VAR_FILES . $p;
 166     $scan = array();
 167     while (file_exists($parse)
 168            && ($scan = scandir($parse))
 169            && count($scan) == 2 // '.' and '..' folders => empty.
 170            && basename($parse) != basename(VAR_FILES)) {
 171         rmdir($parse);
 172         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 173     }
 174 }
 175
 176 /**
 177  * transforms a php.ini string representing a value in an integer
 178  * @param $value the value from php.ini
 179  * @returns an integer for this value
 180  */
 181 function jirafeau_ini_to_bytes($value)
 182 {
 183     $modifier = substr($value, -1);
 184     $bytes = substr($value, 0, -1);
 185     switch (strtoupper($modifier)) {
 186     case 'P':
 187         $bytes *= 1024;
 188     case 'T':
 189         $bytes *= 1024;
 190     case 'G':
 191         $bytes *= 1024;
 192     case 'M':
 193         $bytes *= 1024;
 194     case 'K':
 195         $bytes *= 1024;
 196     }
 197     return $bytes;
 198 }
 199
 200 /**
 201  * gets the maximum upload size according to php.ini
 202  * @returns the maximum upload size in bytes
 203  */
 204 function jirafeau_get_max_upload_size_bytes()
 205 {
 206     return min(jirafeau_ini_to_bytes(ini_get('post_max_size')),
 207                 jirafeau_ini_to_bytes(ini_get('upload_max_filesize')));
 208 }
 209
 210 /**
 211  * gets the maximum upload size according to php.ini
 212  * @returns the maximum upload size string
 213  */
 214 function jirafeau_get_max_upload_size()
 215 {
 216     return jirafeau_human_size(
 217             min(jirafeau_ini_to_bytes(ini_get('post_max_size')),
 218                  jirafeau_ini_to_bytes(ini_get('upload_max_filesize'))));
 219 }
 220
 221 /**
 222  * gets a string explaining the error
 223  * @param $code the error code
 224  * @returns a string explaining the error
 225  */
 226 function jirafeau_upload_errstr($code)
 227 {
 228     switch ($code) {
 229     case UPLOAD_ERR_INI_SIZE:
 230     case UPLOAD_ERR_FORM_SIZE:
 231         return t('Your file exceeds the maximum authorized file size. ');
 232
 233     case UPLOAD_ERR_PARTIAL:
 234     case UPLOAD_ERR_NO_FILE:
 235         return
 236             t('Your file was not uploaded correctly. You may succeed in retrying. ');
 237
 238     case UPLOAD_ERR_NO_TMP_DIR:
 239     case UPLOAD_ERR_CANT_WRITE:
 240     case UPLOAD_ERR_EXTENSION:
 241         return t('Internal error. You may not succeed in retrying. ');
 242     }
 243     return t('Unknown error. ');
 244 }
 245
 246 /** Remove link and it's file
 247  * @param $link the link's name (hash)
 248  */
 249
 250 function jirafeau_delete_link($link)
 251 {
 252     $l = jirafeau_get_link($link);
 253     if (!count($l)) {
 254         return;
 255     }
 256
 257     jirafeau_clean_rm_link($link);
 258
 259     $md5 = $l['md5'];
 260     $p = s2p("$md5");
 261
 262     $counter = 1;
 263     if (file_exists(VAR_FILES . $p . $md5. '_count')) {
 264         $content = file(VAR_FILES . $p . $md5. '_count');
 265         $counter = trim($content[0]);
 266     }
 267     $counter--;
 268
 269     if ($counter >= 1) {
 270         $handle = fopen(VAR_FILES . $p . $md5. '_count', 'w');
 271         fwrite($handle, $counter);
 272         fclose($handle);
 273     }
 274
 275     if ($counter == 0) {
 276         jirafeau_clean_rm_file($md5);
 277     }
 278 }
 279
 280 /**
 281  * Delete a file and it's links.
 282  */
 283 function jirafeau_delete_file($md5)
 284 {
 285     $count = 0;
 286     /* Get all links files. */
 287     $stack = array(VAR_LINKS);
 288     while (($d = array_shift($stack)) && $d != null) {
 289         $dir = scandir($d);
 290
 291         foreach ($dir as $node) {
 292             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 293                 preg_match('/\.tmp/i', "$node")) {
 294                 continue;
 295             }
 296
 297             if (is_dir($d . $node)) {
 298                 /* Push new found directory. */
 299                 $stack[] = $d . $node . '/';
 300             } elseif (is_file($d . $node)) {
 301                 /* Read link informations. */
 302                 $l = jirafeau_get_link(basename($node));
 303                 if (!count($l)) {
 304                     continue;
 305                 }
 306                 if ($l['md5'] == $md5) {
 307                     $count++;
 308                     jirafeau_delete_link($node);
 309                 }
 310             }
 311         }
 312     }
 313     jirafeau_clean_rm_file($md5);
 314     return $count;
 315 }
 316
 317 /**
 318  * handles an uploaded file
 319  * @param $file the file struct given by $_FILE[]
 320  * @param $one_time_download is the file a one time download ?
 321  * @param $key if not empty, protect the file with this key
 322  * @param $time the time of validity of the file
 323  * @param $ip uploader's ip
 324  * @param $crypt boolean asking to crypt or not
 325  * @param $link_name_length size of the link name
 326  * @returns an array containing some information
 327  *   'error' => information on possible errors
 328  *   'link' => the link name of the uploaded file
 329  *   'delete_link' => the link code to delete file
 330  */
 331 function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $link_name_length)
 332 {
 333     if (empty($file['tmp_name']) || !is_uploaded_file($file['tmp_name'])) {
 334         return (array(
 335                  'error' =>
 336                    array('has_error' => true,
 337                           'why' => jirafeau_upload_errstr($file['error'])),
 338                  'link' => '',
 339                  'delete_link' => ''));
 340     }
 341
 342     /* array representing no error */
 343     $noerr = array('has_error' => false, 'why' => '');
 344
 345     /* Crypt file if option is enabled. */
 346     $crypted = false;
 347     $crypt_key = '';
 348     if ($crypt == true && !(extension_loaded('mcrypt') == true)) {
 349         error_log("PHP extension mcrypt not loaded, won't encrypt in Jirafeau");
 350     }
 351     if ($crypt == true && extension_loaded('mcrypt') == true) {
 352         $crypt_key = jirafeau_encrypt_file($file['tmp_name'], $file['tmp_name']);
 353         if (strlen($crypt_key) > 0) {
 354             $crypted = true;
 355         }
 356     }
 357
 358     /* file informations */
 359     $md5 = md5_file($file['tmp_name']);
 360     $name = str_replace(NL, '', trim($file['name']));
 361     $mime_type = $file['type'];
 362     $size = $file['size'];
 363
 364     /* does file already exist ? */
 365     $rc = false;
 366     $p = s2p("$md5");
 367     if (file_exists(VAR_FILES . $p .  $md5)) {
 368         $rc = unlink($file['tmp_name']);
 369     } elseif ((file_exists(VAR_FILES . $p) || @mkdir(VAR_FILES . $p, 0755, true))
 370             && move_uploaded_file($file['tmp_name'], VAR_FILES . $p . $md5)) {
 371         $rc = true;
 372     }
 373     if (!$rc) {
 374         return (array(
 375                  'error' =>
 376                    array('has_error' => true,
 377                           'why' => t('INTERNAL_ERROR_DEL')),
 378                  'link' =>'',
 379                  'delete_link' => ''));
 380     }
 381
 382     /* Increment or create count file. */
 383     $counter = 0;
 384     if (file_exists(VAR_FILES . $p . $md5 . '_count')) {
 385         $content = file(VAR_FILES . $p . $md5. '_count');
 386         $counter = trim($content[0]);
 387     }
 388     $counter++;
 389     $handle = fopen(VAR_FILES . $p . $md5. '_count', 'w');
 390     fwrite($handle, $counter);
 391     fclose($handle);
 392
 393     /* Create delete code. */
 394     $delete_link_code = jirafeau_gen_random(5);
 395
 396     /* md5 password or empty. */
 397     $password = '';
 398     if (!empty($key)) {
 399         $password = md5($key);
 400     }
 401
 402     /* create link file */
 403     $link_tmp_name =  VAR_LINKS . $md5 . rand(0, 10000) . '.tmp';
 404     $handle = fopen($link_tmp_name, 'w');
 405     fwrite($handle,
 406             $name . NL. $mime_type . NL. $size . NL. $password . NL. $time .
 407             NL . $md5. NL . ($one_time_download ? 'O' : 'R') . NL . time() .
 408             NL . $ip . NL. $delete_link_code . NL . ($crypted ? 'C' : 'O'));
 409     fclose($handle);
 410     $md5_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 411     $l = s2p("$md5_link");
 412     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 413         !rename($link_tmp_name, VAR_LINKS . $l . $md5_link)) {
 414         if (file_exists($link_tmp_name)) {
 415             unlink($link_tmp_name);
 416         }
 417
 418         $counter--;
 419         if ($counter >= 1) {
 420             $handle = fopen(VAR_FILES . $p . $md5. '_count', 'w');
 421             fwrite($handle, $counter);
 422             fclose($handle);
 423         } else {
 424             jirafeau_clean_rm_file($md5_link);
 425         }
 426         return array(
 427                  'error' =>
 428                    array('has_error' => true,
 429                           'why' => t('Internal error during file creation. ')),
 430                  'link' =>'',
 431                  'delete_link' => '');
 432     }
 433     return array( 'error' => $noerr,
 434                   'link' => $md5_link,
 435                   'delete_link' => $delete_link_code,
 436                   'crypt_key' => $crypt_key);
 437 }
 438
 439 /**
 440  * Tells if a mime-type is viewable in a browser
 441  * @param $mime the mime type
 442  * @returns a boolean telling if a mime type is viewable
 443  */
 444 function jirafeau_is_viewable($mime)
 445 {
 446     if (!empty($mime)) {
 447         /* Actually, verify if mime-type is an image or a text. */
 448         $viewable = array('image', 'text', 'video', 'audio');
 449         $decomposed = explode('/', $mime);
 450         return in_array($decomposed[0], $viewable);
 451     }
 452     return false;
 453 }
 454
 455 // Error handling functions.
 456 //! Global array that contains all registered errors.
 457 $error_list = array();
 458
 459 /**
 460  * Adds an error to the list of errors.
 461  * @param $title the error's title
 462  * @param $description is a human-friendly description of the problem.
 463  */
 464 function add_error($title, $description)
 465 {
 466     global $error_list;
 467     $error_list[] = '<p>' . $title. '<br />' . $description. '</p>';
 468 }
 469
 470 /**
 471  * Informs whether any error has been registered yet.
 472  * @return true if there are errors.
 473  */
 474 function has_error()
 475 {
 476     global $error_list;
 477     return !empty($error_list);
 478 }
 479
 480 /**
 481  * Displays all the errors.
 482  */
 483 function show_errors()
 484 {
 485     if (has_error()) {
 486         global $error_list;
 487         echo '<div class="error">';
 488         foreach ($error_list as $error) {
 489             echo $error;
 490         }
 491         echo '</div>';
 492     }
 493 }
 494
 495 function check_errors($cfg)
 496 {
 497     if (file_exists(JIRAFEAU_ROOT . 'install.php')
 498         && !($cfg['installation_done'] === true)) {
 499         header('Location: install.php');
 500         exit;
 501     }
 502
 503     /* check if the destination dirs are writable */
 504     $writable = is_writable(VAR_FILES) && is_writable(VAR_LINKS);
 505
 506     /* Checking for errors. */
 507     if (!is_writable(VAR_FILES)) {
 508         add_error(t('The file directory is not writable!'), VAR_FILES);
 509     }
 510
 511     if (!is_writable(VAR_LINKS)) {
 512         add_error(t('The link directory is not writable!'), VAR_LINKS);
 513     }
 514
 515     if (!is_writable(VAR_ASYNC)) {
 516         add_error(t('ASYNC_DIR_W'), VAR_ASYNC);
 517     }
 518 }
 519
 520 /**
 521  * Read link informations
 522  * @return array containing informations.
 523  */
 524 function jirafeau_get_link($hash)
 525 {
 526     $out = array();
 527     $link = VAR_LINKS . s2p("$hash") . $hash;
 528
 529     if (!file_exists($link)) {
 530         return $out;
 531     }
 532
 533     $c = file($link);
 534     $out['file_name'] = trim($c[0]);
 535     $out['mime_type'] = trim($c[1]);
 536     $out['file_size'] = trim($c[2]);
 537     $out['key'] = trim($c[3], NL);
 538     $out['time'] = trim($c[4]);
 539     $out['md5'] = trim($c[5]);
 540     $out['onetime'] = trim($c[6]);
 541     $out['upload_date'] = trim($c[7]);
 542     $out['ip'] = trim($c[8]);
 543     $out['link_code'] = trim($c[9]);
 544     $out['crypted'] = trim($c[10]) == 'C';
 545
 546     return $out;
 547 }
 548
 549 /**
 550  * List files in admin interface.
 551  */
 552 function jirafeau_admin_list($name, $file_hash, $link_hash)
 553 {
 554     echo '<fieldset><legend>';
 555     if (!empty($name)) {
 556         echo t('FILENAME') . ": " . jirafeau_escape($name);
 557     }
 558     if (!empty($file_hash)) {
 559         echo t('FILE') . ": " . jirafeau_escape($file_hash);
 560     }
 561     if (!empty($link_hash)) {
 562         echo t('LINK') . ": " . jirafeau_escape($link_hash);
 563     }
 564     if (empty($name) && empty($file_hash) && empty($link_hash)) {
 565         echo t('LS_FILES');
 566     }
 567     echo '</legend>';
 568     echo '<table>';
 569     echo '<tr>';
 570     echo '<td>' . t('FILENAME') . '</td>';
 571     echo '<td>' . t('TYPE') . '</td>';
 572     echo '<td>' . t('SIZE') . '</td>';
 573     echo '<td>' . t('EXPIRE') . '</td>';
 574     echo '<td>' . t('ONETIME') . '</td>';
 575     echo '<td>' . t('UPLOAD_DATE') . '</td>';
 576     echo '<td>' . t('ORIGIN') . '</td>';
 577     echo '<td>' . t('ACTION') . '</td>';
 578     echo '</tr>';
 579
 580     /* Get all links files. */
 581     $stack = array(VAR_LINKS);
 582     while (($d = array_shift($stack)) && $d != null) {
 583         $dir = scandir($d);
 584         foreach ($dir as $node) {
 585             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 586                 preg_match('/\.tmp/i', "$node")) {
 587                 continue;
 588             }
 589             if (is_dir($d . $node)) {
 590                 /* Push new found directory. */
 591                 $stack[] = $d . $node . '/';
 592             } elseif (is_file($d . $node)) {
 593                 /* Read link informations. */
 594                 $l = jirafeau_get_link($node);
 595                 if (!count($l)) {
 596                     continue;
 597                 }
 598
 599                 /* Filter. */
 600                 if (!empty($name) && !@preg_match("/$name/i", jirafeau_escape($l['file_name']))) {
 601                     continue;
 602                 }
 603                 if (!empty($file_hash) && $file_hash != $l['md5']) {
 604                     continue;
 605                 }
 606                 if (!empty($link_hash) && $link_hash != $node) {
 607                     continue;
 608                 }
 609                 /* Print link informations. */
 610                 echo '<tr>';
 611                 echo '<td>' .
 612                 '<strong><a id="upload_link" href="f.php?h='. jirafeau_escape($node) .'" title="' .
 613                     t('DL_PAGE') . '">' . jirafeau_escape($l['file_name']) . '</a></strong>';
 614                 echo '</td>';
 615                 echo '<td>' . jirafeau_escape($l['mime_type']) . '</td>';
 616                 echo '<td>' . jirafeau_human_size($l['file_size']) . '</td>';
 617                 echo '<td>' . ($l['time'] == -1 ? '∞' : jirafeau_get_datetimefield($l['time'])) . '</td>';
 618                 echo '<td>';
 619                 if ($l['onetime'] == 'O') {
 620                     echo 'Y';
 621                 } else {
 622                     echo 'N';
 623                 }
 624                 echo '</td>';
 625                 echo '<td>' . jirafeau_get_datetimefield($l['upload_date']) . '</td>';
 626                 echo '<td>' . $l['ip'] . '</td>';
 627                 echo '<td>' .
 628                 '<form method="post">' .
 629                 '<input type = "hidden" name = "action" value = "download"/>' .
 630                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 631                 jirafeau_admin_csrf_field() .
 632                 '<input type = "submit" value = "' . t('DL') . '" />' .
 633                 '</form>' .
 634                 '<form method="post">' .
 635                 '<input type = "hidden" name = "action" value = "delete_link"/>' .
 636                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 637                 jirafeau_admin_csrf_field() .
 638                 '<input type = "submit" value = "' . t('DEL_LINK') . '" />' .
 639                 '</form>' .
 640                 '<form method="post">' .
 641                 '<input type = "hidden" name = "action" value = "delete_file"/>' .
 642                 '<input type = "hidden" name = "md5" value = "' . $l['md5'] . '"/>' .
 643                 jirafeau_admin_csrf_field() .
 644                 '<input type = "submit" value = "' . t('DEL_FILE_LINKS') . '" />' .
 645                 '</form>' .
 646                 '</td>';
 647                 echo '</tr>';
 648             }
 649         }
 650     }
 651     echo '</table></fieldset>';
 652 }
 653
 654 /**
 655  * Clean expired files.
 656  * @return number of cleaned files.
 657  */
 658 function jirafeau_admin_clean()
 659 {
 660     $count = 0;
 661     /* Get all links files. */
 662     $stack = array(VAR_LINKS);
 663     while (($d = array_shift($stack)) && $d != null) {
 664         $dir = scandir($d);
 665
 666         foreach ($dir as $node) {
 667             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 668                 preg_match('/\.tmp/i', "$node")) {
 669                 continue;
 670             }
 671
 672             if (is_dir($d . $node)) {
 673                 /* Push new found directory. */
 674                 $stack[] = $d . $node . '/';
 675             } elseif (is_file($d . $node)) {
 676                 /* Read link informations. */
 677                 $l = jirafeau_get_link(basename($node));
 678                 if (!count($l)) {
 679                     continue;
 680                 }
 681                 $p = s2p($l['md5']);
 682                 if ($l['time'] > 0 && $l['time'] < time() || // expired
 683                     !file_exists(VAR_FILES . $p . $l['md5']) || // invalid
 684                     !file_exists(VAR_FILES . $p . $l['md5'] . '_count')) { // invalid
 685                     jirafeau_delete_link($node);
 686                     $count++;
 687                 }
 688             }
 689         }
 690     }
 691     return $count;
 692 }
 693
 694
 695 /**
 696  * Clean old async transferts.
 697  * @return number of cleaned files.
 698  */
 699 function jirafeau_admin_clean_async()
 700 {
 701     $count = 0;
 702     /* Get all links files. */
 703     $stack = array(VAR_ASYNC);
 704     while (($d = array_shift($stack)) && $d != null) {
 705         $dir = scandir($d);
 706
 707         foreach ($dir as $node) {
 708             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 709                 preg_match('/\.tmp/i', "$node")) {
 710                 continue;
 711             }
 712
 713             if (is_dir($d . $node)) {
 714                 /* Push new found directory. */
 715                 $stack[] = $d . $node . '/';
 716             } elseif (is_file($d . $node)) {
 717                 /* Read async informations. */
 718                 $a = jirafeau_get_async_ref(basename($node));
 719                 if (!count($a)) {
 720                     continue;
 721                 }
 722                 /* Delete transferts older than 1 hour. */
 723                 if (time() - $a['last_edited'] > 3600) {
 724                     jirafeau_async_delete(basename($node));
 725                     $count++;
 726                 }
 727             }
 728         }
 729     }
 730     return $count;
 731 }
 732 /**
 733  * Read async transfert informations
 734  * @return array containing informations.
 735  */
 736 function jirafeau_get_async_ref($ref)
 737 {
 738     $out = array();
 739     $refinfos = VAR_ASYNC . s2p("$ref") . "$ref";
 740
 741     if (!file_exists($refinfos)) {
 742         return $out;
 743     }
 744
 745     $c = file($refinfos);
 746     $out['file_name'] = trim($c[0]);
 747     $out['mime_type'] = trim($c[1]);
 748     $out['key'] = trim($c[2], NL);
 749     $out['time'] = trim($c[3]);
 750     $out['onetime'] = trim($c[4]);
 751     $out['ip'] = trim($c[5]);
 752     $out['last_edited'] = trim($c[6]);
 753     $out['next_code'] = trim($c[7]);
 754     return $out;
 755 }
 756
 757 /**
 758  * Delete async transfert informations
 759  */
 760 function jirafeau_async_delete($ref)
 761 {
 762     $p = s2p("$ref");
 763     if (file_exists(VAR_ASYNC . $p . $ref)) {
 764         unlink(VAR_ASYNC . $p . $ref);
 765     }
 766     if (file_exists(VAR_ASYNC . $p . $ref . '_data')) {
 767         unlink(VAR_ASYNC . $p . $ref . '_data');
 768     }
 769     $parse = VAR_ASYNC . $p;
 770     $scan = array();
 771     while (file_exists($parse)
 772            && ($scan = scandir($parse))
 773            && count($scan) == 2 // '.' and '..' folders => empty.
 774            && basename($parse) != basename(VAR_ASYNC)) {
 775         rmdir($parse);
 776         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 777     }
 778 }
 779
 780 /**
 781   * Init a new asynchronous upload.
 782   * @param $finename Name of the file to send
 783   * @param $one_time One time upload parameter
 784   * @param $key eventual password (or blank)
 785   * @param $time time limit
 786   * @param $ip ip address of the client
 787   * @return a string containing a temporary reference followed by a code or the string 'Error'
 788   */
 789 function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
 790 {
 791     $res = 'Error';
 792
 793     /* Create temporary folder. */
 794     $ref;
 795     $p;
 796     $code = jirafeau_gen_random(4);
 797     do {
 798         $ref = jirafeau_gen_random(32);
 799         $p = VAR_ASYNC . s2p($ref);
 800     } while (file_exists($p));
 801     @mkdir($p, 0755, true);
 802     if (!file_exists($p)) {
 803         echo 'Error';
 804         return;
 805     }
 806
 807     /* md5 password or empty */
 808     $password = '';
 809     if (!empty($key)) {
 810         $password = md5($key);
 811     }
 812
 813     /* Store informations. */
 814     $p .= $ref;
 815     $handle = fopen($p, 'w');
 816     fwrite($handle,
 817             str_replace(NL, '', trim($filename)) . NL .
 818             str_replace(NL, '', trim($type)) . NL . $password . NL .
 819             $time . NL . ($one_time ? 'O' : 'R') . NL . $ip . NL .
 820             time() . NL . $code . NL);
 821     fclose($handle);
 822
 823     return $ref . NL . $code ;
 824 }
 825
 826 /**
 827   * Append a piece of file on the asynchronous upload.
 828   * @param $ref asynchronous upload reference
 829   * @param $file piece of data
 830   * @param $code client code for this operation
 831   * @param $max_file_size maximum allowed file size
 832   * @return a string containing a next code to use or the string "Error"
 833   */
 834 function jirafeau_async_push($ref, $data, $code, $max_file_size)
 835 {
 836     /* Get async infos. */
 837     $a = jirafeau_get_async_ref($ref);
 838
 839     /* Check some errors. */
 840     if (count($a) == 0
 841         || $a['next_code'] != "$code"
 842         || empty($data['tmp_name'])
 843         || !is_uploaded_file($data['tmp_name'])) {
 844         return 'Error';
 845     }
 846
 847     $p = s2p($ref);
 848
 849     /* File path. */
 850     $r_path = $data['tmp_name'];
 851     $w_path = VAR_ASYNC . $p . $ref . '_data';
 852
 853     /* Check that file size is not above upload limit. */
 854     if ($max_file_size > 0 &&
 855         filesize($r_path) + filesize($w_path) > $max_file_size * 1024 * 1024) {
 856         jirafeau_async_delete($ref);
 857         return 'Error';
 858     }
 859
 860     /* Concatenate data. */
 861     $r = fopen($r_path, 'r');
 862     $w = fopen($w_path, 'a');
 863     while (!feof($r)) {
 864         if (fwrite($w, fread($r, 1024)) === false) {
 865             fclose($r);
 866             fclose($w);
 867             jirafeau_async_delete($ref);
 868             return 'Error';
 869         }
 870     }
 871     fclose($r);
 872     fclose($w);
 873     unlink($r_path);
 874
 875     /* Update async file. */
 876     $code = jirafeau_gen_random(4);
 877     $handle = fopen(VAR_ASYNC . $p . $ref, 'w');
 878     fwrite($handle,
 879             $a['file_name'] . NL. $a['mime_type'] . NL. $a['key'] . NL .
 880             $a['time'] . NL . $a['onetime'] . NL . $a['ip'] . NL .
 881             time() . NL . $code . NL);
 882     fclose($handle);
 883     return $code;
 884 }
 885
 886 /**
 887   * Finalyze an asynchronous upload.
 888   * @param $ref asynchronous upload reference
 889   * @param $code client code for this operation
 890   * @param $crypt boolean asking to crypt or not
 891   * @param $link_name_length link name length
 892   * @return a string containing the download reference followed by a delete code or the string 'Error'
 893   */
 894 function jirafeau_async_end($ref, $code, $crypt, $link_name_length)
 895 {
 896     /* Get async infos. */
 897     $a = jirafeau_get_async_ref($ref);
 898     if (count($a) == 0
 899         || $a['next_code'] != "$code") {
 900         return "Error";
 901     }
 902
 903     /* Generate link infos. */
 904     $p = VAR_ASYNC . s2p($ref) . $ref . "_data";
 905     if (!file_exists($p)) {
 906         return 'Error';
 907     }
 908
 909     $crypted = false;
 910     $crypt_key = '';
 911     if ($crypt == true && extension_loaded('mcrypt') == true) {
 912         $crypt_key = jirafeau_encrypt_file($p, $p);
 913         if (strlen($crypt_key) > 0) {
 914             $crypted = true;
 915         }
 916     }
 917
 918     $md5 = md5_file($p);
 919     $size = filesize($p);
 920     $np = s2p($md5);
 921     $delete_link_code = jirafeau_gen_random(5);
 922
 923     /* File already exist ? */
 924     if (!file_exists(VAR_FILES . $np)) {
 925         @mkdir(VAR_FILES . $np, 0755, true);
 926     }
 927     if (!file_exists(VAR_FILES . $np . $md5)) {
 928         rename($p, VAR_FILES . $np . $md5);
 929     }
 930
 931     /* Increment or create count file. */
 932     $counter = 0;
 933     if (file_exists(VAR_FILES . $np . $md5 . '_count')) {
 934         $content = file(VAR_FILES . $np . $md5. '_count');
 935         $counter = trim($content[0]);
 936     }
 937     $counter++;
 938     $handle = fopen(VAR_FILES . $np . $md5. '_count', 'w');
 939     fwrite($handle, $counter);
 940     fclose($handle);
 941
 942     /* Create link. */
 943     $link_tmp_name =  VAR_LINKS . $md5 . rand(0, 10000) . '.tmp';
 944     $handle = fopen($link_tmp_name, 'w');
 945     fwrite($handle,
 946             $a['file_name'] . NL . $a['mime_type'] . NL . $size . NL .
 947             $a['key'] . NL . $a['time'] . NL . $md5 . NL . $a['onetime'] . NL .
 948             time() . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C' : 'O'));
 949     fclose($handle);
 950     $md5_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 951     $l = s2p("$md5_link");
 952     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 953         !rename($link_tmp_name, VAR_LINKS . $l . $md5_link)) {
 954         echo "Error";
 955     }
 956
 957     /* Clean async upload. */
 958     jirafeau_async_delete($ref);
 959     return $md5_link . NL . $delete_link_code . NL . urlencode($crypt_key);
 960 }
 961
 962 function jirafeau_crypt_create_iv($base, $size)
 963 {
 964     $iv = '';
 965     while (strlen($iv) < $size) {
 966         $iv = $iv . $base;
 967     }
 968     $iv = substr($iv, 0, $size);
 969     return $iv;
 970 }
 971
 972 /**
 973  * Crypt file and returns decrypt key.
 974  * @param $fp_src file path to the file to crypt.
 975  * @param $fp_dst file path to the file to write crypted file (could be the same).
 976  * @return decrypt key composed of the key and the iv separated by a point ('.')
 977  */
 978 function jirafeau_encrypt_file($fp_src, $fp_dst)
 979 {
 980     $fs = filesize($fp_src);
 981     if ($fs === false || $fs == 0 || !(extension_loaded('mcrypt') == true)) {
 982         return '';
 983     }
 984
 985     /* Prepare module. */
 986     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
 987     /* Generate key. */
 988     $crypt_key = jirafeau_gen_random(10);
 989     $md5_key = md5($crypt_key);
 990     $iv = jirafeau_crypt_create_iv($md5_key, mcrypt_enc_get_iv_size($m));
 991     /* Init module. */
 992     mcrypt_generic_init($m, $md5_key, $iv);
 993     /* Crypt file. */
 994     $r = fopen($fp_src, 'r');
 995     $w = fopen($fp_dst, 'c');
 996     while (!feof($r)) {
 997         $enc = mcrypt_generic($m, fread($r, 1024));
 998         if (fwrite($w, $enc) === false) {
 999             return '';
1000         }
1001     }
1002     fclose($r);
1003     fclose($w);
1004     /* Cleanup. */
1005     mcrypt_generic_deinit($m);
1006     mcrypt_module_close($m);
1007     return $crypt_key;
1008 }
1009
1010 /**
1011  * Decrypt file.
1012  * @param $fp_src file path to the file to decrypt.
1013  * @param $fp_dst file path to the file to write decrypted file (could be the same).
1014  * @param $k string composed of the key and the iv separated by a point ('.')
1015  * @return key used to decrypt. a string of length 0 is returned if failed.
1016  */
1017 function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
1018 {
1019     $fs = filesize($fp_src);
1020     if ($fs === false || $fs == 0 || extension_loaded('mcrypt') == false) {
1021         return false;
1022     }
1023
1024     /* Init module */
1025     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1026     /* Extract key and iv. */
1027     $crypt_key = $k;
1028     $md5_key = md5($crypt_key);
1029     $iv = jirafeau_crypt_create_iv($md5_key, mcrypt_enc_get_iv_size($m));
1030     /* Decrypt file. */
1031     $r = fopen($fp_src, 'r');
1032     $w = fopen($fp_dst, 'c');
1033     while (!feof($r)) {
1034         $dec = mdecrypt_generic($m, fread($r, 1024));
1035         if (fwrite($w, $dec) === false) {
1036             return false;
1037         }
1038     }
1039     fclose($r);
1040     fclose($w);
1041     /* Cleanup. */
1042     mcrypt_generic_deinit($m);
1043     mcrypt_module_close($m);
1044     return true;
1045 }
1046
1047 /**
1048  * Check if Jirafeau is password protected for visitors.
1049  * @return true if Jirafeau is password protected, false otherwise.
1050  */
1051 function jirafeau_has_upload_password($cfg)
1052 {
1053     return count($cfg['upload_password']) > 0;
1054 }
1055
1056 /**
1057  * Challenge password for a visitor.
1058  * @param $password password to be challenged
1059  * @return true if password is valid, false otherwise.
1060  */
1061 function jirafeau_challenge_upload_password($cfg, $password)
1062 {
1063     if (!jirafeau_has_upload_password($cfg)) {
1064         return false;
1065     }
1066     foreach ($cfg['upload_password'] as $p) {
1067         if ($password == $p) {
1068             return true;
1069         }
1070     }
1071     return false;
1072 }
1073
1074 /**
1075  * Test if visitor's IP is authorized to upload.
1076  *
1077  * @param $allowedIpList array of allowed IPs
1078  * @param $challengedIp IP to be challenged
1079  * @return true if IP is authorized, false otherwise.
1080  */
1081 function jirafeau_challenge_upload_ip($allowedIpList, $challengedIp)
1082 {
1083     // skip if list is empty = all IPs allowed
1084     if (count($allowedIpList) == 0) {
1085         return true;
1086     }
1087     // test given IP against each allowed IP
1088     foreach ($allowedIpList as $i) {
1089         if ($i == $challengedIp) {
1090             return true;
1091         }
1092         // CIDR test for IPv4 only.
1093         if (strpos($i, '/') !== false) {
1094             list($subnet, $mask) = explode('/', $i);
1095             if ((ip2long($challengedIp) & ~((1 << (32 - $mask)) - 1)) == ip2long($subnet)) {
1096                 return true;
1097             }
1098         }
1099     }
1100     return false;
1101 }
1102
1103 /**
1104  * Test if visitor's IP is authorized or password is supplied and authorized
1105  * @param $ip IP to be challenged
1106  * @param $password password to be challenged
1107  * @return true if access is valid, false otherwise.
1108  */
1109 function jirafeau_challenge_upload ($cfg, $ip, $password)
1110 {
1111     // Allow if no ip restrictaion and no password restriction
1112     if ((count ($cfg['upload_ip']) == 0) and (count ($cfg['upload_password']) == 0)) {
1113         return true;
1114     }
1115
1116     // Allow if ip is in array
1117     foreach ($cfg['upload_ip'] as $i) {
1118         if ($i == $ip) {
1119             return true;
1120         }
1121         // CIDR test for IPv4 only.
1122         if (strpos ($i, '/') !== false)
1123         {
1124             list ($subnet, $mask) = explode('/', $i);
1125             if ((ip2long ($ip) & ~((1 << (32 - $mask)) - 1) ) == ip2long ($subnet)) {
1126                 return true;
1127             }
1128         }
1129     }
1130     if (!jirafeau_has_upload_password($cfg)) {
1131         return false;
1132     }
1133
1134     foreach ($cfg['upload_password'] as $p) {
1135         if ($password == $p) {
1136             return true;
1137         }
1138     }
1139     return false;
1140 }
1141
1142 /** Tell if we have some HTTP headers generated by a proxy */
1143 function has_http_forwarded()
1144 {
1145     return
1146         !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ||
1147         !empty($_SERVER['http_X_forwarded_for']);
1148 }
1149
1150 /**
1151  * Generate IP list from HTTP headers generated by a proxy
1152  * @return  array of IP strings
1153  */
1154 function get_ip_list_http_forwarded()
1155 {
1156     $ip_list = array();
1157     if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
1158         $l = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
1159         if ($l === false) {
1160             return array();
1161         }
1162         foreach ($l as $ip) {
1163             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1164         }
1165     }
1166     if (!empty($_SERVER['http_X_forwarded_for'])) {
1167         $l = explode(',', $_SERVER['http_X_forwarded_for']);
1168         foreach ($l as $ip) {
1169             // Separate IP from port
1170             $ipa = explode(':', $ip);
1171             if ($ipa === false) {
1172                 continue;
1173             }
1174             $ip = $ipa[0];
1175             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1176         }
1177     }
1178     return $ip_list;
1179 }
1180
1181 /**
1182  * Get the ip address of the client from REMOTE_ADDR
1183  * or from HTTP_X_FORWARDED_FOR if behind a proxy
1184  * @returns the client ip address
1185  */
1186 function get_ip_address($cfg)
1187 {
1188     $remote = $_SERVER['REMOTE_ADDR'];
1189     if (count($cfg['proxy_ip']) == 0 || !has_http_forwarded()) {
1190         return $remote;
1191     }
1192
1193     $ip_list = get_ip_list_http_forwarded();
1194     if (count($ip_list) == 0) {
1195         return $remote;
1196     }
1197
1198     foreach ($cfg['proxy_ip'] as $proxy_ip) {
1199         if ($remote != $proxy_ip) {
1200             continue;
1201         }
1202         // Take the last IP (the one which has been set by the defined proxy).
1203         return end($ip_list);
1204     }
1205     return $remote;
1206 }
1207
1208 /**
1209  * Convert hexadecimal string to base64
1210  */
1211 function hex_to_base64($hex)
1212 {
1213     $b = '';
1214     foreach (str_split($hex, 2) as $pair) {
1215         $b .= chr(hexdec($pair));
1216     }
1217     return base64_encode($b);
1218 }
1219
1220 /**
1221  * Replace markers in templates.
1222  *
1223  * Available markers have the scheme "###MARKERNAME###".
1224  *
1225  * @param $content string Template text with markers
1226  * @param $htmllinebreaks boolean Convert linebreaks to BR-Tags
1227  * @return Template with replaced markers
1228  */
1229 function jirafeau_replace_markers($content, $htmllinebreaks = false)
1230 {
1231     $patterns = array(
1232         '/###ORGANISATION###/',
1233         '/###CONTACTPERSON###/',
1234         '/###WEBROOT###/'
1235     );
1236     $replacements = array(
1237         $GLOBALS['cfg']['organisation'],
1238         $GLOBALS['cfg']['contactperson'],
1239         $GLOBALS['cfg']['web_root']
1240     );
1241     $content = preg_replace($patterns, $replacements, $content);
1242
1243     if (true === $htmllinebreaks) {
1244         $content = nl2br($content);
1245     }
1246
1247     return $content;
1248 }
1249
1250 function jirafeau_escape($string)
1251 {
1252     return htmlspecialchars($string, ENT_QUOTES);
1253 }
1254
1255 function jirafeau_admin_session_start()
1256 {
1257     $_SESSION['admin_auth'] = true;
1258     $_SESSION['admin_csrf'] = md5(uniqid(mt_rand(), true));
1259 }
1260
1261 function jirafeau_admin_session_end()
1262 {
1263     $_SESSION = array();
1264     session_destroy();
1265 }
1266
1267 function jirafeau_admin_session_logged()
1268 {
1269     return isset($_SESSION['admin_auth']) &&
1270            isset($_SESSION['admin_csrf']) &&
1271            isset($_POST['admin_csrf']) &&
1272            $_SESSION['admin_auth'] === true &&
1273            $_SESSION['admin_csrf'] === $_POST['admin_csrf'];
1274 }
1275
1276 function jirafeau_admin_csrf_field()
1277 {
1278     return "<input type='hidden' name='admin_csrf' value='". $_SESSION['admin_csrf'] . "'/>";
1279 }