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  *
   7  *  This program is free software: you can redistribute it and/or modify
   8  *  it under the terms of the GNU Affero General Public License as
   9  *  published by the Free Software Foundation, either version 3 of the
  10  *  License, or (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU Affero General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Affero General Public License
  18  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 /**
  22  * Transform a string in a path by seperating each letters by a '/'.
  23   * @return path finishing with a '/'
  24  */
  25 function
  26 s2p ($s)
  27 {
  28     $p = '';
  29     for ($i = 0; $i < strlen ($s); $i++)
  30         $p .= $s{$i} . '/';
  31     return $p;
  32 }
  33
  34 /**
  35  * Convert base 16 to base 64
  36  * @returns A string based on 64 characters (0-9, a-z, A-Z, "-" and "_")
  37  */
  38 function
  39 base_16_to_64 ($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     # Convert long bin to base 64.
  66     $size *= 4;
  67     for ($i = $size - 6; $i >= 0; $i -= 6)
  68         $o = $m{bindec (substr ($b, $i, 6))} . $o;
  69     # Some few bits remaining ?
  70     if ($i < 0 && $i > -6)
  71         $o = $m{bindec (substr ($b, 0, $i + 6))} . $o;
  72     return $o;
  73 }
  74
  75 /**
  76   * Generate a random code.
  77   * @param $l code length
  78   * @return  random code.
  79   */
  80 function
  81 jirafeau_gen_random ($l)
  82 {
  83     if ($l <= 0)
  84         return 42;
  85
  86     $code="";
  87     for ($i = 0; $i < $l; $i++)
  88         $code .= dechex (rand (0, 15));
  89
  90     return $code;
  91 }
  92
  93 function is_ssl() {
  94     if ( isset($_SERVER['HTTPS']) ) {
  95         if ( 'on' == strtolower($_SERVER['HTTPS']) )
  96             return true;
  97         if ( '1' == $_SERVER['HTTPS'] )
  98             return true;
  99     } elseif ( isset($_SERVER['SERVER_PORT']) && ( '443' == $_SERVER['SERVER_PORT'] ) ) {
 100         return true;
 101     } elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
 102         if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')
 103             return true;
 104     }
 105     return false;
 106 }
 107
 108 function
 109 jirafeau_human_size ($octets)
 110 {
 111     $u = array ('B', 'KB', 'MB', 'GB', 'TB');
 112     $o = max ($octets, 0);
 113     $p = min (floor (($o ? log ($o) : 0) / log (1024)), count ($u) - 1);
 114     $o /= pow (1024, $p);
 115     return round ($o, 1) . $u[$p];
 116 }
 117
 118 function
 119 jirafeau_clean_rm_link ($link)
 120 {
 121     $p = s2p ("$link");
 122     if (file_exists (VAR_LINKS . $p . $link))
 123         unlink (VAR_LINKS . $p . $link);
 124     $parse = VAR_LINKS . $p;
 125     $scan = array();
 126     while (file_exists ($parse)
 127            && ($scan = scandir ($parse))
 128            && count ($scan) == 2 // '.' and '..' folders => empty.
 129            && basename ($parse) != basename (VAR_LINKS))
 130     {
 131         rmdir ($parse);
 132         $parse = substr ($parse, 0, strlen($parse) - strlen(basename ($parse)) - 1);
 133     }
 134 }
 135
 136 function
 137 jirafeau_clean_rm_file ($md5)
 138 {
 139     $p = s2p ("$md5");
 140     $f = VAR_FILES . $p . $md5;
 141     if (file_exists ($f) && is_file ($f))
 142         unlink ($f);
 143     if (file_exists ($f . '_count') && is_file ($f . '_count'))
 144         unlink ($f . '_count');
 145     $parse = VAR_FILES . $p;
 146     $scan = array();
 147     while (file_exists ($parse)
 148            && ($scan = scandir ($parse))
 149            && count ($scan) == 2 // '.' and '..' folders => empty.
 150            && basename ($parse) != basename (VAR_FILES))
 151     {
 152         rmdir ($parse);
 153         $parse = substr ($parse, 0, strlen($parse) - strlen(basename ($parse)) - 1);
 154     }
 155 }
 156
 157 /**
 158  * transforms a php.ini string representing a value in an integer
 159  * @param $value the value from php.ini
 160  * @returns an integer for this value
 161  */
 162 function jirafeau_ini_to_bytes ($value)
 163 {
 164     $modifier = substr ($value, -1);
 165     $bytes = substr ($value, 0, -1);
 166     switch (strtoupper ($modifier))
 167     {
 168     case 'P':
 169         $bytes *= 1024;
 170     case 'T':
 171         $bytes *= 1024;
 172     case 'G':
 173         $bytes *= 1024;
 174     case 'M':
 175         $bytes *= 1024;
 176     case 'K':
 177         $bytes *= 1024;
 178     default:
 179         break;
 180     }
 181     return $bytes;
 182 }
 183
 184 /**
 185  * gets the maximum upload size according to php.ini
 186  * @returns the maximum upload size in bytes
 187  */
 188 function
 189 jirafeau_get_max_upload_size_bytes ()
 190 {
 191     return min (jirafeau_ini_to_bytes (ini_get ('post_max_size')),
 192                 jirafeau_ini_to_bytes (ini_get ('upload_max_filesize')));
 193 }
 194
 195 /**
 196  * gets the maximum upload size according to php.ini
 197  * @returns the maximum upload size string
 198  */
 199 function
 200 jirafeau_get_max_upload_size ()
 201 {
 202     return jirafeau_human_size(
 203             min (jirafeau_ini_to_bytes (ini_get ('post_max_size')),
 204                  jirafeau_ini_to_bytes (ini_get ('upload_max_filesize'))));
 205 }
 206
 207 /**
 208  * gets a string explaining the error
 209  * @param $code the error code
 210  * @returns a string explaining the error
 211  */
 212 function
 213 jirafeau_upload_errstr ($code)
 214 {
 215     switch ($code)
 216     {
 217     case UPLOAD_ERR_INI_SIZE:
 218     case UPLOAD_ERR_FORM_SIZE:
 219         return t('Your file exceeds the maximum authorized file size. ');
 220         break;
 221
 222     case UPLOAD_ERR_PARTIAL:
 223     case UPLOAD_ERR_NO_FILE:
 224         return
 225             t
 226             ('Your file was not uploaded correctly. You may succeed in retrying. ');
 227         break;
 228
 229     case UPLOAD_ERR_NO_TMP_DIR:
 230     case UPLOAD_ERR_CANT_WRITE:
 231     case UPLOAD_ERR_EXTENSION:
 232         return t('Internal error. You may not succeed in retrying. ');
 233         break;
 234
 235     default:
 236         break;
 237     }
 238     return t('Unknown error. ');
 239 }
 240
 241 /** Remove link and it's file
 242  * @param $link the link's name (hash)
 243  */
 244
 245 function
 246 jirafeau_delete_link ($link)
 247 {
 248     $l = jirafeau_get_link ($link);
 249     if (!count ($l))
 250         return;
 251
 252     jirafeau_clean_rm_link ($link);
 253
 254     $md5 = $l['md5'];
 255     $p = s2p ("$md5");
 256
 257     $counter = 1;
 258     if (file_exists (VAR_FILES . $p . $md5. '_count'))
 259     {
 260         $content = file (VAR_FILES . $p . $md5. '_count');
 261         $counter = trim ($content[0]);
 262     }
 263     $counter--;
 264
 265     if ($counter >= 1)
 266     {
 267         $handle = fopen (VAR_FILES . $p . $md5. '_count', 'w');
 268         fwrite ($handle, $counter);
 269         fclose ($handle);
 270     }
 271
 272     if ($counter == 0)
 273         jirafeau_clean_rm_file ($md5);
 274 }
 275
 276 /**
 277  * Delete a file and it's links.
 278  */
 279 function
 280 jirafeau_delete_file ($md5)
 281 {
 282     $count = 0;
 283     /* Get all links files. */
 284     $stack = array (VAR_LINKS);
 285     while (($d = array_shift ($stack)) && $d != NULL)
 286     {
 287         $dir = scandir ($d);
 288
 289         foreach ($dir as $node)
 290         {
 291             if (strcmp ($node, '.') == 0 || strcmp ($node, '..') == 0 ||
 292                 preg_match ('/\.tmp/i', "$node"))
 293                 continue;
 294
 295             if (is_dir ($d . $node))
 296             {
 297                 /* Push new found directory. */
 298                 $stack[] = $d . $node . '/';
 299             }
 300             elseif (is_file ($d . $node))
 301             {
 302                 /* Read link informations. */
 303                 $l = jirafeau_get_link (basename ($node));
 304                 if (!count ($l))
 305                     continue;
 306                 if ($l['md5'] == $md5)
 307                 {
 308                     $count++;
 309                     jirafeau_delete_link ($node);
 310                 }
 311             }
 312         }
 313     }
 314     jirafeau_clean_rm_file ($md5);
 315     return $count;
 316 }
 317
 318 /**
 319  * handles an uploaded file
 320  * @param $file the file struct given by $_FILE[]
 321  * @param $one_time_download is the file a one time download ?
 322  * @param $key if not empty, protect the file with this key
 323  * @param $time the time of validity of the file
 324  * @param $ip uploader's ip
 325  * @param $crypt boolean asking to crypt or not
 326  * @param $link_name_length size of the link name
 327  * @returns an array containing some information
 328  *   'error' => information on possible errors
 329  *   'link' => the link name of the uploaded file
 330  *   'delete_link' => the link code to delete file
 331  */
 332 function
 333 jirafeau_upload ($file, $one_time_download, $key, $time, $ip, $crypt, $link_name_length)
 334 {
 335     if (empty ($file['tmp_name']) || !is_uploaded_file ($file['tmp_name']))
 336     {
 337         return (array(
 338                  'error' =>
 339                    array ('has_error' => true,
 340                           'why' => jirafeau_upload_errstr ($file['error'])),
 341                  'link' => '',
 342                  'delete_link' => ''));
 343     }
 344
 345     /* array representing no error */
 346     $noerr = array ('has_error' => false, 'why' => '');
 347
 348     /* Crypt file if option is enabled. */
 349     $crypted = false;
 350     $crypt_key = '';
 351     if ($crypt == true && !(extension_loaded('mcrypt') == true))
 352         error_log ("PHP extension mcrypt not loaded, won't encrypt in Jirafeau");
 353     if ($crypt == true && extension_loaded('mcrypt') == true)
 354     {
 355         $crypt_key = jirafeau_encrypt_file ($file['tmp_name'], $file['tmp_name']);
 356         if (strlen($crypt_key) > 0)
 357             $crypted = true;
 358     }
 359
 360     /* file informations */
 361     $md5 = md5_file ($file['tmp_name']);
 362     $name = str_replace (NL, '', trim ($file['name']));
 363     $mime_type = $file['type'];
 364     $size = $file['size'];
 365
 366     /* does file already exist ? */
 367     $rc = false;
 368     $p = s2p ("$md5");
 369     if (file_exists (VAR_FILES . $p .  $md5))
 370     {
 371         $rc = unlink ($file['tmp_name']);
 372     }
 373     elseif ((file_exists (VAR_FILES . $p) || @mkdir (VAR_FILES . $p, 0755, true))
 374             && move_uploaded_file ($file['tmp_name'], VAR_FILES . $p . $md5))
 375     {
 376         $rc = true;
 377     }
 378     if (!$rc)
 379     {
 380         return (array(
 381                  'error' =>
 382                    array ('has_error' => true,
 383                           'why' => t('Internal error during file creation.')),
 384                  'link' =>'',
 385                  'delete_link' => ''));
 386     }
 387
 388     /* Increment or create count file. */
 389     $counter = 0;
 390     if (file_exists (VAR_FILES . $p . $md5 . '_count'))
 391     {
 392         $content = file (VAR_FILES . $p . $md5. '_count');
 393         $counter = trim ($content[0]);
 394     }
 395     $counter++;
 396     $handle = fopen (VAR_FILES . $p . $md5. '_count', 'w');
 397     fwrite ($handle, $counter);
 398     fclose ($handle);
 399
 400     /* Create delete code. */
 401     $delete_link_code = jirafeau_gen_random (5);
 402
 403     /* md5 password or empty. */
 404     $password = '';
 405     if (!empty ($key))
 406         $password = md5 ($key);
 407
 408     /* create link file */
 409     $link_tmp_name =  VAR_LINKS . $md5 . rand (0, 10000) . '.tmp';
 410     $handle = fopen ($link_tmp_name, 'w');
 411     fwrite ($handle,
 412             $name . NL. $mime_type . NL. $size . NL. $password . NL. $time .
 413             NL . $md5. NL . ($one_time_download ? 'O' : 'R') . NL . date ('U') .
 414             NL . $ip . NL. $delete_link_code . NL . ($crypted ? 'C' : 'O'));
 415     fclose ($handle);
 416     $md5_link = substr(base_16_to_64 (md5_file ($link_tmp_name)), 0, $link_name_length);
 417     $l = s2p ("$md5_link");
 418     if (!@mkdir (VAR_LINKS . $l, 0755, true) ||
 419         !rename ($link_tmp_name,  VAR_LINKS . $l . $md5_link))
 420     {
 421         if (file_exists ($link_tmp_name))
 422             unlink ($link_tmp_name);
 423
 424         $counter--;
 425         if ($counter >= 1)
 426         {
 427             $handle = fopen (VAR_FILES . $p . $md5. '_count', 'w');
 428             fwrite ($handle, $counter);
 429             fclose ($handle);
 430         }
 431         else
 432         {
 433             jirafeau_clean_rm_file ($md5_link);
 434         }
 435         return (array(
 436                  'error' =>
 437                    array ('has_error' => true,
 438                           'why' => t('Internal error during file creation. ')),
 439                  'link' =>'',
 440                  'delete_link' => ''));
 441     }
 442    return (array ('error' => $noerr,
 443                   'link' => $md5_link,
 444                   'delete_link' => $delete_link_code,
 445                   'crypt_key' => $crypt_key));
 446 }
 447
 448 /**
 449  * Tells if a mime-type is viewable in a browser
 450  * @param $mime the mime type
 451  * @returns a boolean telling if a mime type is viewable
 452  */
 453 function
 454 jirafeau_is_viewable ($mime)
 455 {
 456     if (!empty ($mime))
 457     {
 458         /* Actually, verify if mime-type is an image or a text. */
 459         $viewable = array ('image', 'text', 'video', 'audio');
 460         $decomposed = explode ('/', $mime);
 461         return in_array ($decomposed[0], $viewable);
 462     }
 463     return false;
 464 }
 465
 466 // Error handling functions.
 467 //! Global array that contains all registered errors.
 468 $error_list = array ();
 469
 470 /**
 471  * Adds an error to the list of errors.
 472  * @param $title the error's title
 473  * @param $description is a human-friendly description of the problem.
 474  */
 475 function
 476 add_error ($title, $description)
 477 {
 478     global $error_list;
 479     $error_list[] = '<p>' . $title. '<br />' . $description. '</p>';
 480 }
 481
 482 /**
 483  * Informs whether any error has been registered yet.
 484  * @return true if there are errors.
 485  */
 486 function
 487 has_error ()
 488 {
 489     global $error_list;
 490     return !empty ($error_list);
 491 }
 492
 493 /**
 494  * Displays all the errors.
 495  */
 496 function
 497 show_errors ()
 498 {
 499     if (has_error ())
 500     {
 501         global $error_list;
 502         echo '<div class="error">';
 503         foreach ($error_list as $error)
 504         {
 505             echo $error;
 506         }
 507         echo '</div>';
 508     }
 509 }
 510
 511 function check_errors ($cfg)
 512 {
 513     if (file_exists (JIRAFEAU_ROOT . 'install.php')
 514         && !($cfg['installation_done'] === true))
 515     {
 516         header('Location: install.php');
 517         exit;
 518     }
 519
 520     /* check if the destination dirs are writable */
 521     $writable = is_writable (VAR_FILES) && is_writable (VAR_LINKS);
 522
 523     /* Checking for errors. */
 524     if (!is_writable (VAR_FILES))
 525         add_error (t('The file directory is not writable!'), VAR_FILES);
 526
 527     if (!is_writable (VAR_LINKS))
 528         add_error (t('The link directory is not writable!'), VAR_LINKS);
 529
 530     if (!is_writable (VAR_ASYNC))
 531         add_error (t('The async directory is not writable!'), VAR_ASYNC);
 532 }
 533
 534 /**
 535  * Read link informations
 536  * @return array containing informations.
 537  */
 538 function
 539 jirafeau_get_link ($hash)
 540 {
 541     $out = array ();
 542     $link = VAR_LINKS . s2p ("$hash") . $hash;
 543
 544     if (!file_exists ($link))
 545         return $out;
 546
 547     $c = file ($link);
 548     $out['file_name'] = trim ($c[0]);
 549     $out['mime_type'] = trim ($c[1]);
 550     $out['file_size'] = trim ($c[2]);
 551     $out['key'] = trim ($c[3], NL);
 552     $out['time'] = trim ($c[4]);
 553     $out['md5'] = trim ($c[5]);
 554     $out['onetime'] = trim ($c[6]);
 555     $out['upload_date'] = trim ($c[7]);
 556     $out['ip'] = trim ($c[8]);
 557     $out['link_code'] = trim ($c[9]);
 558     if (trim ($c[10]) == 'C')
 559             $out['crypted'] = true;
 560     else
 561             $out['crypted'] = false;
 562
 563     return $out;
 564 }
 565
 566 /**
 567  * List files in admin interface.
 568  */
 569 function
 570 jirafeau_admin_list ($name, $file_hash, $link_hash)
 571 {
 572     echo '<fieldset><legend>';
 573     if (!empty ($name))
 574         echo t('Filename') . ": $name ";
 575     if (!empty ($file_hash))
 576         echo t('file') . ": $file_hash ";
 577     if (!empty ($link_hash))
 578         echo t('link') . ": $link_hash ";
 579     if (empty ($name) && empty ($file_hash) && empty ($link_hash))
 580         echo t('List all files');
 581     echo '</legend>';
 582     echo '<table>';
 583     echo '<tr>';
 584     echo '<td>' . t('Filename') . '</td>';
 585     echo '<td>' . t('Type') . '</td>';
 586     echo '<td>' . t('Size') . '</td>';
 587     echo '<td>' . t('Expire') . '</td>';
 588     echo '<td>' . t('Onetime') . '</td>';
 589     echo '<td>' . t('Upload date') . '</td>';
 590     echo '<td>' . t('Origin') . '</td>';
 591     echo '<td>' . t('Action') . '</td>';
 592     echo '</tr>';
 593
 594     /* Get all links files. */
 595     $stack = array (VAR_LINKS);
 596     while (($d = array_shift ($stack)) && $d != NULL)
 597     {
 598         $dir = scandir ($d);
 599         foreach ($dir as $node)
 600         {
 601             if (strcmp ($node, '.') == 0 || strcmp ($node, '..') == 0 ||
 602                 preg_match ('/\.tmp/i', "$node"))
 603                 continue;
 604             if (is_dir ($d . $node))
 605             {
 606                 /* Push new found directory. */
 607                 $stack[] = $d . $node . '/';
 608             }
 609             elseif (is_file ($d . $node))
 610             {
 611                 /* Read link informations. */
 612                 $l = jirafeau_get_link ($node);
 613                 if (!count ($l))
 614                     continue;
 615
 616                 /* Filter. */
 617                 if (!empty ($name) && !preg_match ("/$name/i", htmlspecialchars($l['file_name'])))
 618                     continue;
 619                 if (!empty ($file_hash) && $file_hash != $l['md5'])
 620                     continue;
 621                 if (!empty ($link_hash) && $link_hash != $node)
 622                     continue;
 623                 /* Print link informations. */
 624                 echo '<tr>';
 625                 echo '<td>' .
 626                 '<form action = "admin.php" method = "post">' .
 627                 '<input type = "hidden" name = "action" value = "download"/>' .
 628                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 629                 '<input type = "submit" value = "' . htmlspecialchars($l['file_name']) . '" />' .
 630                 '</form>';
 631                 echo '</td>';
 632                 echo '<td>' . $l['mime_type'] . '</td>';
 633                 echo '<td>' . jirafeau_human_size ($l['file_size']) . '</td>';
 634                 echo '<td>' . ($l['time'] == -1 ? '' : strftime ('%c', $l['time'])) .
 635                      '</td>';
 636                 echo '<td>' . $l['onetime'] . '</td>';
 637                 echo '<td>' . strftime ('%c', $l['upload_date']) . '</td>';
 638                 echo '<td>' . $l['ip'] . '</td>';
 639                 echo '<td>' .
 640                 '<form action = "admin.php" method = "post">' .
 641                 '<input type = "hidden" name = "action" value = "delete_link"/>' .
 642                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 643                 '<input type = "submit" value = "' . t('Del link') . '" />' .
 644                 '</form>' .
 645                 '<form action = "admin.php" method = "post">' .
 646                 '<input type = "hidden" name = "action" value = "delete_file"/>' .
 647                 '<input type = "hidden" name = "md5" value = "' . $l['md5'] . '"/>' .
 648                 '<input type = "submit" value = "' . t('Del file and links') . '" />' .
 649                 '</form>' .
 650                 '</td>';
 651                 echo '</tr>';
 652             }
 653         }
 654     }
 655     echo '</table></fieldset>';
 656 }
 657
 658 /**
 659  * Clean expired files.
 660  * @return number of cleaned files.
 661  */
 662 function
 663 jirafeau_admin_clean ()
 664 {
 665     $count = 0;
 666     /* Get all links files. */
 667     $stack = array (VAR_LINKS);
 668     while (($d = array_shift ($stack)) && $d != NULL)
 669     {
 670         $dir = scandir ($d);
 671
 672         foreach ($dir as $node)
 673         {
 674             if (strcmp ($node, '.') == 0 || strcmp ($node, '..') == 0 ||
 675                 preg_match ('/\.tmp/i', "$node"))
 676                 continue;
 677
 678             if (is_dir ($d . $node))
 679             {
 680                 /* Push new found directory. */
 681                 $stack[] = $d . $node . '/';
 682             }
 683             elseif (is_file ($d . $node))
 684             {
 685                 /* Read link informations. */
 686                 $l = jirafeau_get_link (basename ($node));
 687                 if (!count ($l))
 688                     continue;
 689                 $p = s2p ($l['md5']);
 690                 if ($l['time'] > 0 && $l['time'] < time () || // expired
 691                     !file_exists (VAR_FILES . $p . $l['md5']) || // invalid
 692                     !file_exists (VAR_FILES . $p . $l['md5'] . '_count')) // invalid
 693                 {
 694                     jirafeau_delete_link ($node);
 695                     $count++;
 696                 }
 697             }
 698         }
 699     }
 700     return $count;
 701 }
 702
 703
 704 /**
 705  * Clean old async transferts.
 706  * @return number of cleaned files.
 707  */
 708 function
 709 jirafeau_admin_clean_async ()
 710 {
 711     $count = 0;
 712     /* Get all links files. */
 713     $stack = array (VAR_ASYNC);
 714     while (($d = array_shift ($stack)) && $d != NULL)
 715     {
 716         $dir = scandir ($d);
 717
 718         foreach ($dir as $node)
 719         {
 720             if (strcmp ($node, '.') == 0 || strcmp ($node, '..') == 0 ||
 721                 preg_match ('/\.tmp/i', "$node"))
 722                 continue;
 723
 724             if (is_dir ($d . $node))
 725             {
 726                 /* Push new found directory. */
 727                 $stack[] = $d . $node . '/';
 728             }
 729             elseif (is_file ($d . $node))
 730             {
 731                 /* Read async informations. */
 732                 $a = jirafeau_get_async_ref (basename ($node));
 733                 if (!count ($a))
 734                     continue;
 735                 /* Delete transferts older than 1 hour. */
 736                 if (date ('U') - $a['last_edited'] > 3600)
 737                 {
 738                     jirafeau_async_delete (basename ($node));
 739                     $count++;
 740                 }
 741             }
 742         }
 743     }
 744     return $count;
 745 }
 746 /**
 747  * Read async transfert informations
 748  * @return array containing informations.
 749  */
 750 function
 751 jirafeau_get_async_ref ($ref)
 752 {
 753     $out = array ();
 754     $refinfos = VAR_ASYNC . s2p ("$ref") . "$ref";
 755
 756     if (!file_exists ($refinfos))
 757         return $out;
 758
 759     $c = file ($refinfos);
 760     $out['file_name'] = trim ($c[0]);
 761     $out['mime_type'] = trim ($c[1]);
 762     $out['key'] = trim ($c[2], NL);
 763     $out['time'] = trim ($c[3]);
 764     $out['onetime'] = trim ($c[4]);
 765     $out['ip'] = trim ($c[5]);
 766     $out['last_edited'] = trim ($c[6]);
 767     $out['next_code'] = trim ($c[7]);
 768     return $out;
 769 }
 770
 771 /**
 772  * Delete async transfert informations
 773  */
 774 function
 775 jirafeau_async_delete ($ref)
 776 {
 777     $p = s2p ("$ref");
 778     if (file_exists (VAR_ASYNC . $p . $ref))
 779         unlink (VAR_ASYNC . $p . $ref);
 780     if (file_exists (VAR_ASYNC . $p . $ref . '_data'))
 781         unlink (VAR_ASYNC . $p . $ref . '_data');
 782     $parse = VAR_ASYNC . $p;
 783     $scan = array();
 784     while (file_exists ($parse)
 785            && ($scan = scandir ($parse))
 786            && count ($scan) == 2 // '.' and '..' folders => empty.
 787            && basename ($parse) != basename (VAR_ASYNC))
 788     {
 789         rmdir ($parse);
 790         $parse = substr ($parse, 0, strlen($parse) - strlen(basename ($parse)) - 1);
 791     }
 792 }
 793
 794 /**
 795   * Init a new asynchronous upload.
 796   * @param $finename Name of the file to send
 797   * @param $one_time One time upload parameter
 798   * @param $key eventual password (or blank)
 799   * @param $time time limit
 800   * @param $ip ip address of the client
 801   * @return  a string containing a temporary reference followed by a code or the string "Error"
 802   */
 803 function
 804 jirafeau_async_init ($filename, $type, $one_time, $key, $time, $ip)
 805 {
 806     $res = 'Error';
 807
 808     /* Create temporary folder. */
 809     $ref;
 810     $p;
 811     $code = jirafeau_gen_random (4);
 812     do
 813     {
 814         $ref = jirafeau_gen_random (32);
 815         $p = VAR_ASYNC . s2p ($ref);
 816     } while (file_exists ($p));
 817     @mkdir ($p, 0755, true);
 818     if (!file_exists ($p))
 819     {
 820         echo "Error";
 821         return;
 822     }
 823
 824     /* md5 password or empty */
 825     $password = '';
 826     if (!empty ($key))
 827         $password = md5 ($key);
 828
 829     /* Store informations. */
 830     $p .= $ref;
 831     $handle = fopen ($p, 'w');
 832     fwrite ($handle,
 833             str_replace (NL, '', trim ($filename)) . NL .
 834             str_replace (NL, '', trim ($type)) . NL . $password . NL .
 835             $time . NL . ($one_time ? 'O' : 'R') . NL . $ip . NL .
 836             date ('U') . NL . $code . NL);
 837     fclose ($handle);
 838
 839     return $ref . NL . $code ;
 840 }
 841
 842 /**
 843   * Append a piece of file on the asynchronous upload.
 844   * @param $ref asynchronous upload reference
 845   * @param $file piece of data
 846   * @param $code client code for this operation
 847   * @param $max_file_size maximum allowed file size
 848   * @return  a string containing a next code to use or the string "Error"
 849   */
 850 function
 851 jirafeau_async_push ($ref, $data, $code, $max_file_size)
 852 {
 853     /* Get async infos. */
 854     $a = jirafeau_get_async_ref ($ref);
 855
 856     /* Check some errors. */
 857     if (count ($a) == 0
 858         || $a['next_code'] != "$code"
 859         || empty ($data['tmp_name'])
 860         || !is_uploaded_file ($data['tmp_name']))
 861         return "Error";
 862
 863     $p = s2p ($ref);
 864
 865     /* File path. */
 866     $r_path = $data['tmp_name'];
 867     $w_path = VAR_ASYNC . $p . $ref . '_data';
 868
 869     /* Check that file size is not above upload limit. */
 870     if ($max_file_size > 0 &&
 871         filesize ($r_path) + filesize ($w_path) > $max_file_size * 1024 * 1024)
 872     {
 873         jirafeau_async_delete ($ref);
 874         return "Error";
 875     }
 876
 877     /* Concatenate data. */
 878     $r = fopen ($r_path, 'r');
 879     $w = fopen ($w_path, 'a');
 880     while (!feof ($r))
 881     {
 882         if (fwrite ($w, fread ($r, 1024)) === false)
 883         {
 884             fclose ($r);
 885             fclose ($w);
 886             jirafeau_async_delete ($ref);
 887             return "Error";
 888         }
 889     }
 890     fclose ($r);
 891     fclose ($w);
 892     unlink ($r_path);
 893
 894     /* Update async file. */
 895     $code = jirafeau_gen_random (4);
 896     $handle = fopen (VAR_ASYNC . $p . $ref, 'w');
 897     fwrite ($handle,
 898             $a['file_name'] . NL. $a['mime_type'] . NL. $a['key'] . NL .
 899             $a['time'] . NL . $a['onetime'] . NL . $a['ip'] . NL .
 900             date ('U') . NL . $code . NL);
 901     fclose ($handle);
 902     return $code;
 903 }
 904
 905 /**
 906   * Finalyze an asynchronous upload.
 907   * @param $ref asynchronous upload reference
 908   * @param $code client code for this operation
 909   * @param $crypt boolean asking to crypt or not
 910   * @param $link_name_length link name length
 911   * @return  a string containing the download reference followed by a delete code or the string "Error"
 912   */
 913 function
 914 jirafeau_async_end ($ref, $code, $crypt, $link_name_length)
 915 {
 916     /* Get async infos. */
 917     $a = jirafeau_get_async_ref ($ref);
 918     if (count ($a) == 0
 919         || $a['next_code'] != "$code")
 920         return "Error";
 921
 922     /* Generate link infos. */
 923     $p = VAR_ASYNC . s2p ($ref) . $ref . "_data";
 924     if (!file_exists($p))
 925         return "Error";
 926
 927     $crypted = false;
 928     $crypt_key = '';
 929     if ($crypt == true && extension_loaded('mcrypt') == true)
 930     {
 931         $crypt_key = jirafeau_encrypt_file ($p, $p);
 932         if (strlen($crypt_key) > 0)
 933             $crypted = true;
 934     }
 935
 936     $md5 = md5_file ($p);
 937     $size = filesize($p);
 938     $np = s2p ($md5);
 939     $delete_link_code = jirafeau_gen_random (5);
 940
 941     /* File already exist ? */
 942     if (!file_exists (VAR_FILES . $np))
 943         @mkdir (VAR_FILES . $np, 0755, true);
 944     if (!file_exists (VAR_FILES . $np . $md5))
 945         rename ($p, VAR_FILES . $np . $md5);
 946
 947     /* Increment or create count file. */
 948     $counter = 0;
 949     if (file_exists (VAR_FILES . $np . $md5 . '_count'))
 950     {
 951         $content = file (VAR_FILES . $np . $md5. '_count');
 952         $counter = trim ($content[0]);
 953     }
 954     $counter++;
 955     $handle = fopen (VAR_FILES . $np . $md5. '_count', 'w');
 956     fwrite ($handle, $counter);
 957     fclose ($handle);
 958
 959     /* Create link. */
 960     $link_tmp_name =  VAR_LINKS . $md5 . rand (0, 10000) . '.tmp';
 961     $handle = fopen ($link_tmp_name, 'w');
 962     fwrite ($handle,
 963             $a['file_name'] . NL . $a['mime_type'] . NL . $size . NL .
 964             $a['key'] . NL . $a['time'] . NL . $md5 . NL . $a['onetime'] . NL .
 965             date ('U') . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C' : 'O'));
 966     fclose ($handle);
 967     $md5_link = substr(base_16_to_64 (md5_file ($link_tmp_name)), 0, $link_name_length);
 968     $l = s2p ("$md5_link");
 969     if (!@mkdir (VAR_LINKS . $l, 0755, true) ||
 970         !rename ($link_tmp_name,  VAR_LINKS . $l . $md5_link))
 971         echo "Error";
 972
 973     /* Clean async upload. */
 974     jirafeau_async_delete ($ref);
 975     return $md5_link . NL . $delete_link_code . NL . urlencode($crypt_key);
 976 }
 977
 978 function
 979 jirafeau_crypt_create_iv($base, $size)
 980 {
 981     $iv = '';
 982     while (strlen ($iv) < $size)
 983         $iv = $iv . $base;
 984     $iv = substr($iv, 0, $size);
 985     return $iv;
 986 }
 987
 988 /**
 989  * Crypt file and returns decrypt key.
 990  * @param $fp_src file path to the file to crypt.
 991  * @param $fp_dst file path to the file to write crypted file (could be the same).
 992  * @return decrypt key composed of the key and the iv separated by a point ('.')
 993  */
 994 function
 995 jirafeau_encrypt_file ($fp_src, $fp_dst)
 996 {
 997     $fs = filesize ($fp_src);
 998     if ($fs === false || $fs == 0 || !(extension_loaded('mcrypt') == true))
 999         return '';
1000
1001     /* Prepare module. */
1002     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1003     /* Generate key. */
1004     $crypt_key = jirafeau_gen_random (10);
1005     $md5_key = md5($crypt_key);
1006     $iv = jirafeau_crypt_create_iv ($md5_key, mcrypt_enc_get_iv_size($m));
1007     /* Init module. */
1008     mcrypt_generic_init($m, $md5_key, $iv);
1009     /* Crypt file. */
1010     $r = fopen ($fp_src, 'r');
1011     $w = fopen ($fp_dst, 'c');
1012     while (!feof ($r))
1013     {
1014         $enc = mcrypt_generic($m, fread ($r, 1024));
1015         if (fwrite ($w, $enc) === false)
1016             return '';
1017     }
1018     fclose ($r);
1019     fclose ($w);
1020     /* Cleanup. */
1021     mcrypt_generic_deinit($m);
1022     mcrypt_module_close($m);
1023     return $crypt_key;
1024 }
1025
1026 /**
1027  * Decrypt file.
1028  * @param $fp_src file path to the file to decrypt.
1029  * @param $fp_dst file path to the file to write decrypted file (could be the same).
1030  * @param $k string composed of the key and the iv separated by a point ('.')
1031  * @return key used to decrypt. a string of length 0 is returned if failed.
1032  */
1033 function
1034 jirafeau_decrypt_file ($fp_src, $fp_dst, $k)
1035 {
1036     $fs = filesize ($fp_src);
1037     if ($fs === false || $fs == 0 || !(extension_loaded('mcrypt') == true))
1038         return false;
1039
1040     /* Init module */
1041     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1042     /* Extract key and iv. */
1043     $crypt_key = $k;
1044     $md5_key = md5($crypt_key);
1045     $iv = jirafeau_crypt_create_iv ($md5_key, mcrypt_enc_get_iv_size($m));
1046     /* Decrypt file. */
1047     $r = fopen ($fp_src, 'r');
1048     $w = fopen ($fp_dst, 'c');
1049     while (!feof ($r))
1050     {
1051         $dec = mdecrypt_generic($m, fread ($r, 1024));
1052         if (fwrite ($w, $dec) === false)
1053             return false;
1054     }
1055     fclose ($r);
1056     fclose ($w);
1057     /* Cleanup. */
1058     mcrypt_generic_deinit($m);
1059     mcrypt_module_close($m);
1060     return true;
1061 }
1062
1063 /**
1064  * Check if Jirafeau is password protected for visitors.
1065  * @return true if Jirafeau is password protected, false otherwise.
1066  */
1067 function jirafeau_has_upload_password ($cfg)
1068 {
1069     return count ($cfg['upload_password']) > 0;
1070 }
1071
1072 /**
1073  * Challenge password for a visitor.
1074  * @param $password password to be challenged
1075  * @return true if password is valid, false otherwise.
1076  */
1077 function jirafeau_challenge_upload_password ($cfg, $password)
1078 {
1079     if (!jirafeau_has_upload_password($cfg))
1080         return false;
1081     forEach ($cfg['upload_password'] as $p)
1082         if ($password == $p)
1083             return true;
1084     return false;
1085 }
1086
1087 /**
1088  * Test if visitor's IP is authorized to upload.
1089  * @param $ip IP to be challenged
1090  * @return true if IP is authorized, false otherwise.
1091  */
1092 function jirafeau_challenge_upload_ip ($cfg, $ip)
1093 {
1094     if (count ($cfg['upload_ip']) == 0)
1095         return true;
1096     forEach ($cfg['upload_ip'] as $i)
1097     {
1098         if ($i == $ip)
1099             return true;
1100         // CIDR test for IPv4 only.
1101         if (strpos ($i, '/') !== false)
1102         {
1103             list ($subnet, $mask) = explode('/', $i);
1104             if ((ip2long ($ip) & ~((1 << (32 - $mask)) - 1) ) == ip2long ($subnet))
1105                 return true;
1106         }
1107     }
1108     return false;
1109 }
1110
1111 /** Tell if we have some HTTP headers generated by a proxy */
1112 function has_http_forwarded()
1113 {
1114     if (!empty ($_SERVER['HTTP_X_FORWARDED_FOR']))
1115         return true;
1116     if (!empty ($_SERVER['http_X_forwarded_for']))
1117         return true;
1118     return false;
1119 }
1120
1121 /**
1122  * Generate IP list from HTTP headers generated by a proxy
1123  * @return  array of IP strings
1124  */
1125 function get_ip_list_http_forwarded()
1126 {
1127     $ip_list = array();
1128     if (!empty ($_SERVER['HTTP_X_FORWARDED_FOR']))
1129     {
1130         $l = explode (',', $_SERVER['HTTP_X_FORWARDED_FOR']);
1131         foreach ($l as $ip)
1132             array_push ($ip_list, preg_replace ('/\s+/', '', $ip));
1133     }
1134     if (!empty ($_SERVER['http_X_forwarded_for']))
1135     {
1136         $l = explode (',', $_SERVER['http_X_forwarded_for']);
1137         foreach ($l as $ip)
1138         {
1139             // Separate IP from port
1140             $ip = explode (':', $ip)[0];
1141             array_push ($ip_list, preg_replace ('/\s+/', '', $ip));
1142         }
1143     }
1144     return $ip_list;
1145 }
1146
1147 /**
1148  * Get the ip address of the client from REMOTE_ADDR
1149  * or from HTTP_X_FORWARDED_FOR if behind a proxy
1150  * @returns the client ip address
1151  */
1152 function get_ip_address($cfg) {
1153     $remote = $_SERVER['REMOTE_ADDR'];
1154     if (count ($cfg['proxy_ip']) == 0 || !has_http_forwarded ())
1155         return $remote;
1156
1157     $ip_list = get_ip_list_http_forwarded ();
1158     if (count ($ip_list) == 0)
1159         return $remote;
1160
1161     foreach ($cfg['proxy_ip'] as $proxy_ip)
1162     {
1163         if ($remote != $proxy_ip)
1164             continue;
1165         // Take the last IP (the one which has been set by the defined proxy).
1166         return end ($ip_list);
1167     }
1168     return $remote;
1169 }
1170
1171 /**
1172  * Convert hexadecimal string to base64
1173  */
1174 function hex_to_base64($hex)
1175 {
1176     $b = '';
1177     foreach (str_split ($hex, 2) as $pair)
1178         $b .= chr (hexdec ($pair));
1179     return base64_encode ($b);
1180 }
1181
1182 /**
1183  * Read alias informations
1184  * @return array containing informations.
1185  */
1186 function
1187 jirafeau_get_alias ($hash)
1188 {
1189     $out = array ();
1190     $link = VAR_ALIAS . s2p ("$hash") . $hash;
1191
1192     if (!file_exists ($link))
1193         return $out;
1194
1195     $c = file ($link);
1196     $out['md5_password'] = trim ($c[0]);
1197     $out['ip'] = trim ($c[1]);
1198     $out['update_date'] = trim ($c[2]);
1199     $out['destination'] = trim ($c[3], NL);
1200
1201     return $out;
1202 }
1203
1204 /** Create an alias to a jirafeau's link.
1205  * @param $alias alias name
1206  * @param $destination reference of the destination
1207  * @param $password password to protect alias
1208  * @param $ip client's IP
1209  * @return  a string containing the edit code of the alias or the string "Error"
1210  */
1211 function jirafeau_alias_create ($alias, $destination, $password, $ip)
1212 {
1213     /* Check that alias and password are long enough. */
1214     if (strlen ($alias) < 8 ||
1215         strlen ($alias) > 32 ||
1216         strlen ($password) < 8 ||
1217         strlen ($password) > 32)
1218         return "Error";
1219
1220     /* Check that destination exists. */
1221     $l = jirafeau_get_link ($destination);
1222     if (!count ($l))
1223         return "Error";
1224
1225     /* Check that alias does not already exists. */
1226     $alias = md5 ($alias);
1227     $p = VAR_ALIAS . s2p ($alias);
1228     if (file_exists ($p))
1229         return "Error";
1230
1231     /* Create alias folder. */
1232     @mkdir ($p, 0755, true);
1233     if (!file_exists ($p))
1234         return "Error";
1235
1236     /* Generate password. */
1237     $md5_password = md5 ($password);
1238
1239     /* Store informations. */
1240     $p .= $alias;
1241     $handle = fopen ($p, 'w');
1242     fwrite ($handle,
1243             $md5_password . NL .
1244             $ip . NL .
1245             date ('U') . NL .
1246             $destination . NL);
1247     fclose ($handle);
1248
1249     return "Ok";
1250 }
1251
1252 /** Update an alias.
1253  * @param $alias alias to update
1254  * @param $destination reference of the new destination
1255  * @param $password password to protect alias
1256  * @param $new_password optional new password to protect alias
1257  * @param $ip client's IP
1258  * @return "Ok" or "Error" string
1259  */
1260 function jirafeau_alias_update ($alias, $destination, $password,
1261                                 $new_password, $ip)
1262 {
1263     $alias = md5 ($alias);
1264     /* Check that alias exits. */
1265     $a = jirafeau_get_alias ($alias);
1266     if (!count ($a))
1267         return "Error";
1268
1269     /* Check that destination exists. */
1270     $l = jirafeau_get_link ($a["destination"]);
1271     if (!count ($l))
1272         return "Error";
1273
1274     /* Check password. */
1275     if ($a["md5_password"] != md5 ($password))
1276         return "Error";
1277
1278     $p = $a["md5_password"];
1279     if (strlen ($new_password) >= 8 &&
1280         strlen ($new_password) <= 32)
1281         $p = md5 ($new_password);
1282     else if (strlen ($new_password) > 0)
1283         return "Error";
1284
1285     /* Rewrite informations. */
1286     $p = VAR_ALIAS . s2p ($alias) . $alias;
1287     $handle = fopen ($p, 'w');
1288     fwrite ($handle,
1289             $p . NL .
1290             $ip . NL .
1291             date ('U') . NL .
1292             $destination . NL);
1293     fclose ($handle);
1294     return "Ok";
1295 }
1296
1297 /** Get an alias.
1298  * @param $alias alias to get
1299  * @return alias destination or "Error" string
1300  */
1301 function jirafeau_alias_get ($alias)
1302 {
1303     $alias = md5 ($alias);
1304     /* Check that alias exits. */
1305     $a = jirafeau_get_alias ($alias);
1306     if (!count ($a))
1307         return "Error";
1308
1309     return $a["destination"];
1310 }
1311
1312 function jirafeau_clean_rm_alias ($alias)
1313 {
1314     $p = s2p ("$alias");
1315     if (file_exists (VAR_ALIAS . $p . $alias))
1316         unlink (VAR_ALIAS . $p . $alias);
1317     $parse = VAR_ALIAS . $p;
1318     $scan = array();
1319     while (file_exists ($parse)
1320            && ($scan = scandir ($parse))
1321            && count ($scan) == 2 // '.' and '..' folders => empty.
1322            && basename ($parse) != basename (VAR_ALIAS))
1323     {
1324         rmdir ($parse);
1325         $parse = substr ($parse, 0, strlen($parse) - strlen(basename ($parse)) - 1);
1326     }
1327 }
1328
1329 /** Delete an alias.
1330  * @param $alias alias to delete
1331  * @param $password password to protect alias
1332  * @return "Ok" or "Error" string
1333  */
1334 function jirafeau_alias_delete ($alias, $password)
1335 {
1336     $alias = md5 ($alias);
1337     /* Check that alias exits. */
1338     $a = jirafeau_get_alias ($alias);
1339     if (!count ($a))
1340         return "Error";
1341
1342     /* Check password. */
1343     if ($a["md5_password"] != md5 ($password))
1344         return "Error";
1345
1346     jirafeau_clean_rm_alias ($alias);
1347     return "Ok";
1348 }
1349