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     /* check if the destination dirs are writable */
 502     $writable = is_writable(VAR_FILES) && is_writable(VAR_LINKS);
 503
 504     /* Checking for errors. */
 505     if (!is_writable(VAR_FILES)) {
 506         add_error(t('The file directory is not writable!'), VAR_FILES);
 507     }
 508
 509     if (!is_writable(VAR_LINKS)) {
 510         add_error(t('The link directory is not writable!'), VAR_LINKS);
 511     }
 512
 513     if (!is_writable(VAR_ASYNC)) {
 514         add_error(t('ASYNC_DIR_W'), VAR_ASYNC);
 515     }
 516 }
 517
 518 /**
 519  * Read link informations
 520  * @return array containing informations.
 521  */
 522 function jirafeau_get_link($hash)
 523 {
 524     $out = array();
 525     $link = VAR_LINKS . s2p("$hash") . $hash;
 526
 527     if (!file_exists($link)) {
 528         return $out;
 529     }
 530
 531     $c = file($link);
 532     $out['file_name'] = trim($c[0]);
 533     $out['mime_type'] = trim($c[1]);
 534     $out['file_size'] = trim($c[2]);
 535     $out['key'] = trim($c[3], NL);
 536     $out['time'] = trim($c[4]);
 537     $out['md5'] = trim($c[5]);
 538     $out['onetime'] = trim($c[6]);
 539     $out['upload_date'] = trim($c[7]);
 540     $out['ip'] = trim($c[8]);
 541     $out['link_code'] = trim($c[9]);
 542     $out['crypted'] = trim($c[10]) == 'C';
 543
 544     return $out;
 545 }
 546
 547 /**
 548  * List files in admin interface.
 549  */
 550 function jirafeau_admin_list($name, $file_hash, $link_hash)
 551 {
 552     echo '<fieldset><legend>';
 553     if (!empty($name)) {
 554         echo t('FILENAME') . ": " . jirafeau_escape($name);
 555     }
 556     if (!empty($file_hash)) {
 557         echo t('FILE') . ": " . jirafeau_escape($file_hash);
 558     }
 559     if (!empty($link_hash)) {
 560         echo t('LINK') . ": " . jirafeau_escape($link_hash);
 561     }
 562     if (empty($name) && empty($file_hash) && empty($link_hash)) {
 563         echo t('LS_FILES');
 564     }
 565     echo '</legend>';
 566     echo '<table>';
 567     echo '<tr>';
 568     echo '<td>' . t('FILENAME') . '</td>';
 569     echo '<td>' . t('TYPE') . '</td>';
 570     echo '<td>' . t('SIZE') . '</td>';
 571     echo '<td>' . t('EXPIRE') . '</td>';
 572     echo '<td>' . t('ONETIME') . '</td>';
 573     echo '<td>' . t('UPLOAD_DATE') . '</td>';
 574     echo '<td>' . t('ORIGIN') . '</td>';
 575     echo '<td>' . t('ACTION') . '</td>';
 576     echo '</tr>';
 577
 578     /* Get all links files. */
 579     $stack = array(VAR_LINKS);
 580     while (($d = array_shift($stack)) && $d != null) {
 581         $dir = scandir($d);
 582         foreach ($dir as $node) {
 583             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 584                 preg_match('/\.tmp/i', "$node")) {
 585                 continue;
 586             }
 587             if (is_dir($d . $node)) {
 588                 /* Push new found directory. */
 589                 $stack[] = $d . $node . '/';
 590             } elseif (is_file($d . $node)) {
 591                 /* Read link informations. */
 592                 $l = jirafeau_get_link($node);
 593                 if (!count($l)) {
 594                     continue;
 595                 }
 596
 597                 /* Filter. */
 598                 if (!empty($name) && !@preg_match("/$name/i", jirafeau_escape($l['file_name']))) {
 599                     continue;
 600                 }
 601                 if (!empty($file_hash) && $file_hash != $l['md5']) {
 602                     continue;
 603                 }
 604                 if (!empty($link_hash) && $link_hash != $node) {
 605                     continue;
 606                 }
 607                 /* Print link informations. */
 608                 echo '<tr>';
 609                 echo '<td>' .
 610                 '<strong><a id="upload_link" href="f.php?h='. jirafeau_escape($node) .'" title="' .
 611                     t('DL_PAGE') . '">' . jirafeau_escape($l['file_name']) . '</a></strong>';
 612                 echo '</td>';
 613                 echo '<td>' . jirafeau_escape($l['mime_type']) . '</td>';
 614                 echo '<td>' . jirafeau_human_size($l['file_size']) . '</td>';
 615                 echo '<td>' . ($l['time'] == -1 ? '∞' : jirafeau_get_datetimefield($l['time'])) . '</td>';
 616                 echo '<td>';
 617                 if ($l['onetime'] == 'O') {
 618                     echo 'Y';
 619                 } else {
 620                     echo 'N';
 621                 }
 622                 echo '</td>';
 623                 echo '<td>' . jirafeau_get_datetimefield($l['upload_date']) . '</td>';
 624                 echo '<td>' . $l['ip'] . '</td>';
 625                 echo '<td>' .
 626                 '<form method="post">' .
 627                 '<input type = "hidden" name = "action" value = "download"/>' .
 628                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 629                 jirafeau_admin_csrf_field() .
 630                 '<input type = "submit" value = "' . t('DL') . '" />' .
 631                 '</form>' .
 632                 '<form method="post">' .
 633                 '<input type = "hidden" name = "action" value = "delete_link"/>' .
 634                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 635                 jirafeau_admin_csrf_field() .
 636                 '<input type = "submit" value = "' . t('DEL_LINK') . '" />' .
 637                 '</form>' .
 638                 '<form method="post">' .
 639                 '<input type = "hidden" name = "action" value = "delete_file"/>' .
 640                 '<input type = "hidden" name = "md5" value = "' . $l['md5'] . '"/>' .
 641                 jirafeau_admin_csrf_field() .
 642                 '<input type = "submit" value = "' . t('DEL_FILE_LINKS') . '" />' .
 643                 '</form>' .
 644                 '</td>';
 645                 echo '</tr>';
 646             }
 647         }
 648     }
 649     echo '</table></fieldset>';
 650 }
 651
 652 /**
 653  * Clean expired files.
 654  * @return number of cleaned files.
 655  */
 656 function jirafeau_admin_clean()
 657 {
 658     $count = 0;
 659     /* Get all links files. */
 660     $stack = array(VAR_LINKS);
 661     while (($d = array_shift($stack)) && $d != null) {
 662         $dir = scandir($d);
 663
 664         foreach ($dir as $node) {
 665             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 666                 preg_match('/\.tmp/i', "$node")) {
 667                 continue;
 668             }
 669
 670             if (is_dir($d . $node)) {
 671                 /* Push new found directory. */
 672                 $stack[] = $d . $node . '/';
 673             } elseif (is_file($d . $node)) {
 674                 /* Read link informations. */
 675                 $l = jirafeau_get_link(basename($node));
 676                 if (!count($l)) {
 677                     continue;
 678                 }
 679                 $p = s2p($l['md5']);
 680                 if ($l['time'] > 0 && $l['time'] < time() || // expired
 681                     !file_exists(VAR_FILES . $p . $l['md5']) || // invalid
 682                     !file_exists(VAR_FILES . $p . $l['md5'] . '_count')) { // invalid
 683                     jirafeau_delete_link($node);
 684                     $count++;
 685                 }
 686             }
 687         }
 688     }
 689     return $count;
 690 }
 691
 692
 693 /**
 694  * Clean old async transferts.
 695  * @return number of cleaned files.
 696  */
 697 function jirafeau_admin_clean_async()
 698 {
 699     $count = 0;
 700     /* Get all links files. */
 701     $stack = array(VAR_ASYNC);
 702     while (($d = array_shift($stack)) && $d != null) {
 703         $dir = scandir($d);
 704
 705         foreach ($dir as $node) {
 706             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 707                 preg_match('/\.tmp/i', "$node")) {
 708                 continue;
 709             }
 710
 711             if (is_dir($d . $node)) {
 712                 /* Push new found directory. */
 713                 $stack[] = $d . $node . '/';
 714             } elseif (is_file($d . $node)) {
 715                 /* Read async informations. */
 716                 $a = jirafeau_get_async_ref(basename($node));
 717                 if (!count($a)) {
 718                     continue;
 719                 }
 720                 /* Delete transferts older than 1 hour. */
 721                 if (time() - $a['last_edited'] > 3600) {
 722                     jirafeau_async_delete(basename($node));
 723                     $count++;
 724                 }
 725             }
 726         }
 727     }
 728     return $count;
 729 }
 730 /**
 731  * Read async transfert informations
 732  * @return array containing informations.
 733  */
 734 function jirafeau_get_async_ref($ref)
 735 {
 736     $out = array();
 737     $refinfos = VAR_ASYNC . s2p("$ref") . "$ref";
 738
 739     if (!file_exists($refinfos)) {
 740         return $out;
 741     }
 742
 743     $c = file($refinfos);
 744     $out['file_name'] = trim($c[0]);
 745     $out['mime_type'] = trim($c[1]);
 746     $out['key'] = trim($c[2], NL);
 747     $out['time'] = trim($c[3]);
 748     $out['onetime'] = trim($c[4]);
 749     $out['ip'] = trim($c[5]);
 750     $out['last_edited'] = trim($c[6]);
 751     $out['next_code'] = trim($c[7]);
 752     return $out;
 753 }
 754
 755 /**
 756  * Delete async transfert informations
 757  */
 758 function jirafeau_async_delete($ref)
 759 {
 760     $p = s2p("$ref");
 761     if (file_exists(VAR_ASYNC . $p . $ref)) {
 762         unlink(VAR_ASYNC . $p . $ref);
 763     }
 764     if (file_exists(VAR_ASYNC . $p . $ref . '_data')) {
 765         unlink(VAR_ASYNC . $p . $ref . '_data');
 766     }
 767     $parse = VAR_ASYNC . $p;
 768     $scan = array();
 769     while (file_exists($parse)
 770            && ($scan = scandir($parse))
 771            && count($scan) == 2 // '.' and '..' folders => empty.
 772            && basename($parse) != basename(VAR_ASYNC)) {
 773         rmdir($parse);
 774         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 775     }
 776 }
 777
 778 /**
 779   * Init a new asynchronous upload.
 780   * @param $finename Name of the file to send
 781   * @param $one_time One time upload parameter
 782   * @param $key eventual password (or blank)
 783   * @param $time time limit
 784   * @param $ip ip address of the client
 785   * @return a string containing a temporary reference followed by a code or the string 'Error'
 786   */
 787 function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
 788 {
 789     $res = 'Error';
 790
 791     /* Create temporary folder. */
 792     $ref;
 793     $p;
 794     $code = jirafeau_gen_random(4);
 795     do {
 796         $ref = jirafeau_gen_random(32);
 797         $p = VAR_ASYNC . s2p($ref);
 798     } while (file_exists($p));
 799     @mkdir($p, 0755, true);
 800     if (!file_exists($p)) {
 801         echo 'Error';
 802         return;
 803     }
 804
 805     /* md5 password or empty */
 806     $password = '';
 807     if (!empty($key)) {
 808         $password = md5($key);
 809     }
 810
 811     /* Store informations. */
 812     $p .= $ref;
 813     $handle = fopen($p, 'w');
 814     fwrite($handle,
 815             str_replace(NL, '', trim($filename)) . NL .
 816             str_replace(NL, '', trim($type)) . NL . $password . NL .
 817             $time . NL . ($one_time ? 'O' : 'R') . NL . $ip . NL .
 818             time() . NL . $code . NL);
 819     fclose($handle);
 820
 821     return $ref . NL . $code ;
 822 }
 823
 824 /**
 825   * Append a piece of file on the asynchronous upload.
 826   * @param $ref asynchronous upload reference
 827   * @param $file piece of data
 828   * @param $code client code for this operation
 829   * @param $max_file_size maximum allowed file size
 830   * @return a string containing a next code to use or the string "Error"
 831   */
 832 function jirafeau_async_push($ref, $data, $code, $max_file_size)
 833 {
 834     /* Get async infos. */
 835     $a = jirafeau_get_async_ref($ref);
 836
 837     /* Check some errors. */
 838     if (count($a) == 0
 839         || $a['next_code'] != "$code"
 840         || empty($data['tmp_name'])
 841         || !is_uploaded_file($data['tmp_name'])) {
 842         return 'Error';
 843     }
 844
 845     $p = s2p($ref);
 846
 847     /* File path. */
 848     $r_path = $data['tmp_name'];
 849     $w_path = VAR_ASYNC . $p . $ref . '_data';
 850
 851     /* Check that file size is not above upload limit. */
 852     if ($max_file_size > 0 &&
 853         filesize($r_path) + filesize($w_path) > $max_file_size * 1024 * 1024) {
 854         jirafeau_async_delete($ref);
 855         return 'Error';
 856     }
 857
 858     /* Concatenate data. */
 859     $r = fopen($r_path, 'r');
 860     $w = fopen($w_path, 'a');
 861     while (!feof($r)) {
 862         if (fwrite($w, fread($r, 1024)) === false) {
 863             fclose($r);
 864             fclose($w);
 865             jirafeau_async_delete($ref);
 866             return 'Error';
 867         }
 868     }
 869     fclose($r);
 870     fclose($w);
 871     unlink($r_path);
 872
 873     /* Update async file. */
 874     $code = jirafeau_gen_random(4);
 875     $handle = fopen(VAR_ASYNC . $p . $ref, 'w');
 876     fwrite($handle,
 877             $a['file_name'] . NL. $a['mime_type'] . NL. $a['key'] . NL .
 878             $a['time'] . NL . $a['onetime'] . NL . $a['ip'] . NL .
 879             time() . NL . $code . NL);
 880     fclose($handle);
 881     return $code;
 882 }
 883
 884 /**
 885   * Finalyze an asynchronous upload.
 886   * @param $ref asynchronous upload reference
 887   * @param $code client code for this operation
 888   * @param $crypt boolean asking to crypt or not
 889   * @param $link_name_length link name length
 890   * @return a string containing the download reference followed by a delete code or the string 'Error'
 891   */
 892 function jirafeau_async_end($ref, $code, $crypt, $link_name_length)
 893 {
 894     /* Get async infos. */
 895     $a = jirafeau_get_async_ref($ref);
 896     if (count($a) == 0
 897         || $a['next_code'] != "$code") {
 898         return "Error";
 899     }
 900
 901     /* Generate link infos. */
 902     $p = VAR_ASYNC . s2p($ref) . $ref . "_data";
 903     if (!file_exists($p)) {
 904         return 'Error';
 905     }
 906
 907     $crypted = false;
 908     $crypt_key = '';
 909     if ($crypt == true && extension_loaded('mcrypt') == true) {
 910         $crypt_key = jirafeau_encrypt_file($p, $p);
 911         if (strlen($crypt_key) > 0) {
 912             $crypted = true;
 913         }
 914     }
 915
 916     $md5 = md5_file($p);
 917     $size = filesize($p);
 918     $np = s2p($md5);
 919     $delete_link_code = jirafeau_gen_random(5);
 920
 921     /* File already exist ? */
 922     if (!file_exists(VAR_FILES . $np)) {
 923         @mkdir(VAR_FILES . $np, 0755, true);
 924     }
 925     if (!file_exists(VAR_FILES . $np . $md5)) {
 926         rename($p, VAR_FILES . $np . $md5);
 927     }
 928
 929     /* Increment or create count file. */
 930     $counter = 0;
 931     if (file_exists(VAR_FILES . $np . $md5 . '_count')) {
 932         $content = file(VAR_FILES . $np . $md5. '_count');
 933         $counter = trim($content[0]);
 934     }
 935     $counter++;
 936     $handle = fopen(VAR_FILES . $np . $md5. '_count', 'w');
 937     fwrite($handle, $counter);
 938     fclose($handle);
 939
 940     /* Create link. */
 941     $link_tmp_name =  VAR_LINKS . $md5 . rand(0, 10000) . '.tmp';
 942     $handle = fopen($link_tmp_name, 'w');
 943     fwrite($handle,
 944             $a['file_name'] . NL . $a['mime_type'] . NL . $size . NL .
 945             $a['key'] . NL . $a['time'] . NL . $md5 . NL . $a['onetime'] . NL .
 946             time() . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C' : 'O'));
 947     fclose($handle);
 948     $md5_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 949     $l = s2p("$md5_link");
 950     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 951         !rename($link_tmp_name, VAR_LINKS . $l . $md5_link)) {
 952         echo "Error";
 953     }
 954
 955     /* Clean async upload. */
 956     jirafeau_async_delete($ref);
 957     return $md5_link . NL . $delete_link_code . NL . urlencode($crypt_key);
 958 }
 959
 960 function jirafeau_crypt_create_iv($base, $size)
 961 {
 962     $iv = '';
 963     while (strlen($iv) < $size) {
 964         $iv = $iv . $base;
 965     }
 966     $iv = substr($iv, 0, $size);
 967     return $iv;
 968 }
 969
 970 /**
 971  * Crypt file and returns decrypt key.
 972  * @param $fp_src file path to the file to crypt.
 973  * @param $fp_dst file path to the file to write crypted file (could be the same).
 974  * @return decrypt key composed of the key and the iv separated by a point ('.')
 975  */
 976 function jirafeau_encrypt_file($fp_src, $fp_dst)
 977 {
 978     $fs = filesize($fp_src);
 979     if ($fs === false || $fs == 0 || !(extension_loaded('mcrypt') == true)) {
 980         return '';
 981     }
 982
 983     /* Prepare module. */
 984     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
 985     /* Generate key. */
 986     $crypt_key = jirafeau_gen_random(10);
 987     $md5_key = md5($crypt_key);
 988     $iv = jirafeau_crypt_create_iv($md5_key, mcrypt_enc_get_iv_size($m));
 989     /* Init module. */
 990     mcrypt_generic_init($m, $md5_key, $iv);
 991     /* Crypt file. */
 992     $r = fopen($fp_src, 'r');
 993     $w = fopen($fp_dst, 'c');
 994     while (!feof($r)) {
 995         $enc = mcrypt_generic($m, fread($r, 1024));
 996         if (fwrite($w, $enc) === false) {
 997             return '';
 998         }
 999     }
1000     fclose($r);
1001     fclose($w);
1002     /* Cleanup. */
1003     mcrypt_generic_deinit($m);
1004     mcrypt_module_close($m);
1005     return $crypt_key;
1006 }
1007
1008 /**
1009  * Decrypt file.
1010  * @param $fp_src file path to the file to decrypt.
1011  * @param $fp_dst file path to the file to write decrypted file (could be the same).
1012  * @param $k string composed of the key and the iv separated by a point ('.')
1013  * @return key used to decrypt. a string of length 0 is returned if failed.
1014  */
1015 function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
1016 {
1017     $fs = filesize($fp_src);
1018     if ($fs === false || $fs == 0 || extension_loaded('mcrypt') == false) {
1019         return false;
1020     }
1021
1022     /* Init module */
1023     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1024     /* Extract key and iv. */
1025     $crypt_key = $k;
1026     $md5_key = md5($crypt_key);
1027     $iv = jirafeau_crypt_create_iv($md5_key, mcrypt_enc_get_iv_size($m));
1028     /* Decrypt file. */
1029     $r = fopen($fp_src, 'r');
1030     $w = fopen($fp_dst, 'c');
1031     while (!feof($r)) {
1032         $dec = mdecrypt_generic($m, fread($r, 1024));
1033         if (fwrite($w, $dec) === false) {
1034             return false;
1035         }
1036     }
1037     fclose($r);
1038     fclose($w);
1039     /* Cleanup. */
1040     mcrypt_generic_deinit($m);
1041     mcrypt_module_close($m);
1042     return true;
1043 }
1044
1045 /**
1046  * Check if Jirafeau is password protected for visitors.
1047  * @return true if Jirafeau is password protected, false otherwise.
1048  */
1049 function jirafeau_has_upload_password($cfg)
1050 {
1051     return count($cfg['upload_password']) > 0;
1052 }
1053
1054 /**
1055  * Challenge password for a visitor.
1056  * @param $password password to be challenged
1057  * @return true if password is valid, false otherwise.
1058  */
1059 function jirafeau_challenge_upload_password($cfg, $password)
1060 {
1061     if (!jirafeau_has_upload_password($cfg)) {
1062         return false;
1063     }
1064     foreach ($cfg['upload_password'] as $p) {
1065         if ($password == $p) {
1066             return true;
1067         }
1068     }
1069     return false;
1070 }
1071
1072 /**
1073  * Test if visitor's IP is authorized to upload.
1074  *
1075  * @param $allowedIpList array of allowed IPs
1076  * @param $challengedIp IP to be challenged
1077  * @return true if IP is authorized, false otherwise.
1078  */
1079 function jirafeau_challenge_upload_ip($allowedIpList, $challengedIp)
1080 {
1081     // skip if list is empty = all IPs allowed
1082     if (count($allowedIpList) == 0) {
1083         return true;
1084     }
1085     // test given IP against each allowed IP
1086     foreach ($allowedIpList as $i) {
1087         if ($i == $challengedIp) {
1088             return true;
1089         }
1090         // CIDR test for IPv4 only.
1091         if (strpos($i, '/') !== false) {
1092             list($subnet, $mask) = explode('/', $i);
1093             if ((ip2long($challengedIp) & ~((1 << (32 - $mask)) - 1)) == ip2long($subnet)) {
1094                 return true;
1095             }
1096         }
1097     }
1098     return false;
1099 }
1100
1101 /**
1102  * Test if visitor's IP is authorized or password is supplied and authorized
1103  * @param $ip IP to be challenged
1104  * @param $password password to be challenged
1105  * @return true if access is valid, false otherwise.
1106  */
1107 function jirafeau_challenge_upload ($cfg, $ip, $password)
1108 {
1109     // Allow if no ip restrictaion and no password restriction
1110     if ((count ($cfg['upload_ip']) == 0) and (count ($cfg['upload_password']) == 0)) {
1111         return true;
1112     }
1113
1114     // Allow if ip is in array
1115     foreach ($cfg['upload_ip'] as $i) {
1116         if ($i == $ip) {
1117             return true;
1118         }
1119         // CIDR test for IPv4 only.
1120         if (strpos ($i, '/') !== false)
1121         {
1122             list ($subnet, $mask) = explode('/', $i);
1123             if ((ip2long ($ip) & ~((1 << (32 - $mask)) - 1) ) == ip2long ($subnet)) {
1124                 return true;
1125             }
1126         }
1127     }
1128     if (!jirafeau_has_upload_password($cfg)) {
1129         return false;
1130     }
1131
1132     foreach ($cfg['upload_password'] as $p) {
1133         if ($password == $p) {
1134             return true;
1135         }
1136     }
1137     return false;
1138 }
1139
1140 /** Tell if we have some HTTP headers generated by a proxy */
1141 function has_http_forwarded()
1142 {
1143     return
1144         !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ||
1145         !empty($_SERVER['http_X_forwarded_for']);
1146 }
1147
1148 /**
1149  * Generate IP list from HTTP headers generated by a proxy
1150  * @return  array of IP strings
1151  */
1152 function get_ip_list_http_forwarded()
1153 {
1154     $ip_list = array();
1155     if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
1156         $l = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
1157         if ($l === false) {
1158             return array();
1159         }
1160         foreach ($l as $ip) {
1161             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1162         }
1163     }
1164     if (!empty($_SERVER['http_X_forwarded_for'])) {
1165         $l = explode(',', $_SERVER['http_X_forwarded_for']);
1166         foreach ($l as $ip) {
1167             // Separate IP from port
1168             $ipa = explode(':', $ip);
1169             if ($ipa === false) {
1170                 continue;
1171             }
1172             $ip = $ipa[0];
1173             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1174         }
1175     }
1176     return $ip_list;
1177 }
1178
1179 /**
1180  * Get the ip address of the client from REMOTE_ADDR
1181  * or from HTTP_X_FORWARDED_FOR if behind a proxy
1182  * @returns the client ip address
1183  */
1184 function get_ip_address($cfg)
1185 {
1186     $remote = $_SERVER['REMOTE_ADDR'];
1187     if (count($cfg['proxy_ip']) == 0 || !has_http_forwarded()) {
1188         return $remote;
1189     }
1190
1191     $ip_list = get_ip_list_http_forwarded();
1192     if (count($ip_list) == 0) {
1193         return $remote;
1194     }
1195
1196     foreach ($cfg['proxy_ip'] as $proxy_ip) {
1197         if ($remote != $proxy_ip) {
1198             continue;
1199         }
1200         // Take the last IP (the one which has been set by the defined proxy).
1201         return end($ip_list);
1202     }
1203     return $remote;
1204 }
1205
1206 /**
1207  * Convert hexadecimal string to base64
1208  */
1209 function hex_to_base64($hex)
1210 {
1211     $b = '';
1212     foreach (str_split($hex, 2) as $pair) {
1213         $b .= chr(hexdec($pair));
1214     }
1215     return base64_encode($b);
1216 }
1217
1218 /**
1219  * Replace markers in templates.
1220  *
1221  * Available markers have the scheme "###MARKERNAME###".
1222  *
1223  * @param $content string Template text with markers
1224  * @param $htmllinebreaks boolean Convert linebreaks to BR-Tags
1225  * @return Template with replaced markers
1226  */
1227 function jirafeau_replace_markers($content, $htmllinebreaks = false)
1228 {
1229     $patterns = array(
1230         '/###ORGANISATION###/',
1231         '/###CONTACTPERSON###/',
1232         '/###WEBROOT###/'
1233     );
1234     $replacements = array(
1235         $GLOBALS['cfg']['organisation'],
1236         $GLOBALS['cfg']['contactperson'],
1237         $GLOBALS['cfg']['web_root']
1238     );
1239     $content = preg_replace($patterns, $replacements, $content);
1240
1241     if (true === $htmllinebreaks) {
1242         $content = nl2br($content);
1243     }
1244
1245     return $content;
1246 }
1247
1248 function jirafeau_escape($string)
1249 {
1250     return htmlspecialchars($string, ENT_QUOTES);
1251 }
1252
1253 function jirafeau_admin_session_start()
1254 {
1255     $_SESSION['admin_auth'] = true;
1256     $_SESSION['admin_csrf'] = md5(uniqid(mt_rand(), true));
1257 }
1258
1259 function jirafeau_admin_session_end()
1260 {
1261     $_SESSION = array();
1262     session_destroy();
1263 }
1264
1265 function jirafeau_admin_session_logged()
1266 {
1267     return isset($_SESSION['admin_auth']) &&
1268            isset($_SESSION['admin_csrf']) &&
1269            isset($_POST['admin_csrf']) &&
1270            $_SESSION['admin_auth'] === true &&
1271            $_SESSION['admin_csrf'] === $_POST['admin_csrf'];
1272 }
1273
1274 function jirafeau_admin_csrf_field()
1275 {
1276     return "<input type='hidden' name='admin_csrf' value='". $_SESSION['admin_csrf'] . "'/>";
1277 }