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