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     $block_size = 8;
  29     $p = '';
  30     for ($i = 0; $i < strlen($s); $i++) {
  31         $p .= $s{$i};
  32         if (($i + 1) % $block_size == 0) {
  33             $p .= '/';
  34         }
  35     }
  36     if (strlen($s) % $block_size != 0) {
  37         $p .= '/';
  38     }
  39     return $p;
  40 }
  41
  42 /**
  43  * Convert base 16 to base 64
  44  * @returns A string based on 64 characters (0-9, a-z, A-Z, "-" and "_")
  45  */
  46 function base_16_to_64($num)
  47 {
  48     $m = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_';
  49     $hex2bin = array('0000',  # 0
  50                       '0001',  # 1
  51                       '0010',  # 2
  52                       '0011',  # 3
  53                       '0100',  # 4
  54                       '0101',  # 5
  55                       '0110',  # 6
  56                       '0111',  # 7
  57                       '1000',  # 8
  58                       '1001',  # 9
  59                       '1010',  # a
  60                       '1011',  # b
  61                       '1100',  # c
  62                       '1101',  # d
  63                       '1110',  # e
  64                       '1111'); # f
  65     $o = '';
  66     $b = '';
  67     $i = 0;
  68     # Convert long hex string to bin.
  69     $size = strlen($num);
  70     for ($i = 0; $i < $size; $i++) {
  71         $b .= $hex2bin{hexdec($num{$i})};
  72     }
  73     # Convert long bin to base 64.
  74     $size *= 4;
  75     for ($i = $size - 6; $i >= 0; $i -= 6) {
  76         $o = $m{bindec(substr($b, $i, 6))} . $o;
  77     }
  78     # Some few bits remaining ?
  79     if ($i < 0 && $i > -6) {
  80         $o = $m{bindec(substr($b, 0, $i + 6))} . $o;
  81     }
  82     return $o;
  83 }
  84
  85 /**
  86   * Generate a random code.
  87   * @param $l code length
  88   * @return  random code.
  89   */
  90 function jirafeau_gen_random($l)
  91 {
  92     if ($l <= 0) {
  93         return 42;
  94     }
  95
  96     $code="";
  97     for ($i = 0; $i < $l; $i++) {
  98         $code .= dechex(rand(0, 15));
  99     }
 100
 101     return $code;
 102 }
 103
 104 function is_ssl()
 105 {
 106     if (isset($_SERVER['HTTPS'])) {
 107         if ('on' == strtolower($_SERVER['HTTPS']) ||
 108              '1' == $_SERVER['HTTPS']) {
 109             return true;
 110         }
 111     } elseif (isset($_SERVER['SERVER_PORT']) && ('443' == $_SERVER['SERVER_PORT'])) {
 112         return true;
 113     } elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
 114         if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
 115             return true;
 116         }
 117     }
 118     return false;
 119 }
 120
 121 function jirafeau_human_size($octets)
 122 {
 123     $u = array('B', 'KB', 'MB', 'GB', 'TB');
 124     $o = max($octets, 0);
 125     $p = min(floor(($o ? log($o) : 0) / log(1024)), count($u) - 1);
 126     $o /= pow(1024, $p);
 127     return round($o, 1) . $u[$p];
 128 }
 129
 130 // Convert UTC timestamp to a datetime field
 131 function jirafeau_get_datetimefield($timestamp)
 132 {
 133     $content = '<span class="datetime" data-datetime="' . strftime('%Y-%m-%d %H:%M', $timestamp) . '">'
 134         . strftime('%Y-%m-%d %H:%M', $timestamp) . ' (GMT)</span>';
 135     return $content;
 136 }
 137
 138 function jirafeau_fatal_error($errorText, $cfg = array())
 139 {
 140     echo '<div class="error"><h2>Error</h2><p>' . $errorText . '</p></div>';
 141     require(JIRAFEAU_ROOT . 'lib/template/footer.php');
 142     exit;
 143 }
 144
 145 function jirafeau_clean_rm_link($link)
 146 {
 147     $p = s2p("$link");
 148     if (file_exists(VAR_LINKS . $p . $link)) {
 149         unlink(VAR_LINKS . $p . $link);
 150     }
 151     $parse = VAR_LINKS . $p;
 152     $scan = array();
 153     while (file_exists($parse)
 154            && ($scan = scandir($parse))
 155            && count($scan) == 2 // '.' and '..' folders => empty.
 156            && basename($parse) != basename(VAR_LINKS)) {
 157         rmdir($parse);
 158         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 159     }
 160 }
 161
 162 function jirafeau_clean_rm_file($hash)
 163 {
 164     $p = s2p("$hash");
 165     $f = VAR_FILES . $p . $hash;
 166     if (file_exists($f) && is_file($f)) {
 167         unlink($f);
 168     }
 169     if (file_exists($f . '_count') && is_file($f . '_count')) {
 170         unlink($f . '_count');
 171     }
 172     $parse = VAR_FILES . $p;
 173     $scan = array();
 174     while (file_exists($parse)
 175            && ($scan = scandir($parse))
 176            && count($scan) == 2 // '.' and '..' folders => empty.
 177            && basename($parse) != basename(VAR_FILES)) {
 178         rmdir($parse);
 179         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 180     }
 181 }
 182
 183 /**
 184  * transforms a php.ini string representing a value in an integer
 185  * @param $value the value from php.ini
 186  * @returns an integer for this value
 187  */
 188 function jirafeau_ini_to_bytes($value)
 189 {
 190     $modifier = substr($value, -1);
 191     $bytes = substr($value, 0, -1);
 192     switch (strtoupper($modifier)) {
 193     case 'P':
 194         $bytes *= 1024;
 195     case 'T':
 196         $bytes *= 1024;
 197     case 'G':
 198         $bytes *= 1024;
 199     case 'M':
 200         $bytes *= 1024;
 201     case 'K':
 202         $bytes *= 1024;
 203     }
 204     return $bytes;
 205 }
 206
 207 /**
 208  * gets the maximum upload size according to php.ini
 209  * @returns the maximum upload size in bytes
 210  */
 211 function jirafeau_get_max_upload_size_bytes()
 212 {
 213     return min(jirafeau_ini_to_bytes(ini_get('post_max_size')),
 214                jirafeau_ini_to_bytes(ini_get('upload_max_filesize')));
 215 }
 216
 217 /**
 218  * gets the maximum upload size according to php.ini
 219  * @returns the maximum upload size string
 220  */
 221 function jirafeau_get_max_upload_size()
 222 {
 223     return jirafeau_human_size(jirafeau_get_max_upload_size_bytes());
 224 }
 225
 226 /**
 227  * gets a string explaining the error
 228  * @param $code the error code
 229  * @returns a string explaining the error
 230  */
 231 function jirafeau_upload_errstr($code)
 232 {
 233     switch ($code) {
 234     case UPLOAD_ERR_INI_SIZE:
 235     case UPLOAD_ERR_FORM_SIZE:
 236         return t('Your file exceeds the maximum authorized file size. ');
 237
 238     case UPLOAD_ERR_PARTIAL:
 239     case UPLOAD_ERR_NO_FILE:
 240         return
 241             t('Your file was not uploaded correctly. You may succeed in retrying. ');
 242
 243     case UPLOAD_ERR_NO_TMP_DIR:
 244     case UPLOAD_ERR_CANT_WRITE:
 245     case UPLOAD_ERR_EXTENSION:
 246         return t('Internal error. You may not succeed in retrying. ');
 247     }
 248     return t('Unknown error. ');
 249 }
 250
 251 /** Remove link and it's file
 252  * @param $link the link's name (hash)
 253  */
 254
 255 function jirafeau_delete_link($link)
 256 {
 257     $l = jirafeau_get_link($link);
 258     if (!count($l)) {
 259         return;
 260     }
 261
 262     jirafeau_clean_rm_link($link);
 263
 264     $hash = $l['hash'];
 265     $p = s2p("$hash");
 266
 267     $counter = 1;
 268     if (file_exists(VAR_FILES . $p . $hash. '_count')) {
 269         $content = file(VAR_FILES . $p . $hash. '_count');
 270         $counter = trim($content[0]);
 271     }
 272     $counter--;
 273
 274     if ($counter >= 1) {
 275         $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 276         fwrite($handle, $counter);
 277         fclose($handle);
 278     }
 279
 280     if ($counter == 0) {
 281         jirafeau_clean_rm_file($hash);
 282     }
 283 }
 284
 285 /**
 286  * Delete a file and it's links.
 287  */
 288 function jirafeau_delete_file($hash)
 289 {
 290     $count = 0;
 291     /* Get all links files. */
 292     $stack = array(VAR_LINKS);
 293     while (($d = array_shift($stack)) && $d != null) {
 294         $dir = scandir($d);
 295
 296         foreach ($dir as $node) {
 297             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 298                 preg_match('/\.tmp/i', "$node")) {
 299                 continue;
 300             }
 301
 302             if (is_dir($d . $node)) {
 303                 /* Push new found directory. */
 304                 $stack[] = $d . $node . '/';
 305             } elseif (is_file($d . $node)) {
 306                 /* Read link informations. */
 307                 $l = jirafeau_get_link(basename($node));
 308                 if (!count($l)) {
 309                     continue;
 310                 }
 311                 if ($l['hash'] == $hash) {
 312                     $count++;
 313                     jirafeau_delete_link($node);
 314                 }
 315             }
 316         }
 317     }
 318     jirafeau_clean_rm_file($hash);
 319     return $count;
 320 }
 321
 322
 323 /** hash file's content
 324  * @param $method hash method, see 'file_hash' option. 'md5' or 'md5_outside'.
 325  * @param $file_path file to hash
 326  * @returns hash string
 327  */
 328 function jirafeau_hash_file($method, $file_path)
 329 {
 330     switch ($method) {
 331         case 'md5_outside':
 332             return jirafeau_md5_outside($file_path);
 333         case 'md5':
 334             return md5_file($file_path);
 335     }
 336     return md5_file($file_path);
 337 }
 338
 339 /** hash part of file: start, end and size.
 340  * This is a partial file hash, faster but weaker.
 341  * @param $file_path file to hash
 342  * @returns hash string
 343  */
 344 function jirafeau_md5_outside($file_path)
 345 {
 346     $size = filesize($file_path);
 347     if ($size === false) {
 348         $size = 0;
 349     }
 350     $handle = fopen($file_path, "r");
 351     if ($handle === false) {
 352         return false;
 353     }
 354     $first = fread($handle, 64);
 355     if ($first === false) {
 356         return false;
 357     }
 358     fseek($handle, $size < 64 ? 0 : $size - 64);
 359     $last = fread($handle, 64);
 360     fclose($handle);
 361     return md5($first . $last . $size);
 362 }
 363
 364 /**
 365  * handles an uploaded file
 366  * @param $file the file struct given by $_FILE[]
 367  * @param $one_time_download is the file a one time download ?
 368  * @param $key if not empty, protect the file with this key
 369  * @param $time the time of validity of the file
 370  * @param $ip uploader's ip
 371  * @param $crypt boolean asking to crypt or not
 372  * @param $link_name_length size of the link name
 373  * @returns an array containing some information
 374  *   'error' => information on possible errors
 375  *   'link' => the link name of the uploaded file
 376  *   'delete_link' => the link code to delete file
 377  */
 378 function jirafeau_upload($file, $one_time_download, $key, $time, $ip, $crypt, $link_name_length, $file_hash_method)
 379 {
 380     if (empty($file['tmp_name']) || !is_uploaded_file($file['tmp_name'])) {
 381         return (array(
 382                  'error' =>
 383                    array('has_error' => true,
 384                           'why' => jirafeau_upload_errstr($file['error'])),
 385                  'link' => '',
 386                  'delete_link' => ''));
 387     }
 388
 389     /* array representing no error */
 390     $noerr = array('has_error' => false, 'why' => '');
 391
 392     /* Crypt file if option is enabled. */
 393     $crypted = false;
 394     $crypt_key = '';
 395     if ($crypt == true && !(extension_loaded('mcrypt') == true)) {
 396         error_log("PHP extension mcrypt not loaded, won't encrypt in Jirafeau");
 397     }
 398     if ($crypt == true && extension_loaded('mcrypt') == true) {
 399         $crypt_key = jirafeau_encrypt_file($file['tmp_name'], $file['tmp_name']);
 400         if (strlen($crypt_key) > 0) {
 401             $crypted = true;
 402         }
 403     }
 404
 405     /* file informations */
 406     $hash = jirafeau_hash_file($file_hash_method, $file['tmp_name']);
 407     $name = str_replace(NL, '', trim($file['name']));
 408     $mime_type = $file['type'];
 409     $size = $file['size'];
 410
 411     /* does file already exist ? */
 412     $rc = false;
 413     $p = s2p("$hash");
 414     if (file_exists(VAR_FILES . $p .  $hash)) {
 415         $rc = unlink($file['tmp_name']);
 416     } elseif ((file_exists(VAR_FILES . $p) || @mkdir(VAR_FILES . $p, 0755, true))
 417             && move_uploaded_file($file['tmp_name'], VAR_FILES . $p . $hash)) {
 418         $rc = true;
 419     }
 420     if (!$rc) {
 421         return (array(
 422                  'error' =>
 423                    array('has_error' => true,
 424                           'why' => t('INTERNAL_ERROR_DEL')),
 425                  'link' =>'',
 426                  'delete_link' => ''));
 427     }
 428
 429     /* Increment or create count file. */
 430     $counter = 0;
 431     if (file_exists(VAR_FILES . $p . $hash . '_count')) {
 432         $content = file(VAR_FILES . $p . $hash. '_count');
 433         $counter = trim($content[0]);
 434     }
 435     $counter++;
 436     $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 437     fwrite($handle, $counter);
 438     fclose($handle);
 439
 440     /* Create delete code. */
 441     $delete_link_code = jirafeau_gen_random(5);
 442
 443     /* hash password or empty. */
 444     $password = '';
 445     if (!empty($key)) {
 446         $password = md5($key);
 447     }
 448
 449     /* create link file */
 450     $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
 451     $handle = fopen($link_tmp_name, 'w');
 452     fwrite($handle,
 453             $name . NL. $mime_type . NL. $size . NL. $password . NL. $time .
 454             NL . $hash. NL . ($one_time_download ? 'O' : 'R') . NL . time() .
 455             NL . $ip . NL. $delete_link_code . NL . ($crypted ? 'C' : 'O'));
 456     fclose($handle);
 457     $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 458     $l = s2p("$hash_link");
 459     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 460         !rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
 461         if (file_exists($link_tmp_name)) {
 462             unlink($link_tmp_name);
 463         }
 464
 465         $counter--;
 466         if ($counter >= 1) {
 467             $handle = fopen(VAR_FILES . $p . $hash. '_count', 'w');
 468             fwrite($handle, $counter);
 469             fclose($handle);
 470         } else {
 471             jirafeau_clean_rm_file($hash_link);
 472         }
 473         return array(
 474                  'error' =>
 475                    array('has_error' => true,
 476                           'why' => t('Internal error during file creation. ')),
 477                  'link' =>'',
 478                  'delete_link' => '');
 479     }
 480     return array( 'error' => $noerr,
 481                   'link' => $hash_link,
 482                   'delete_link' => $delete_link_code,
 483                   'crypt_key' => $crypt_key);
 484 }
 485
 486 /**
 487  * Tells if a mime-type is viewable in a browser
 488  * @param $mime the mime type
 489  * @returns a boolean telling if a mime type is viewable
 490  */
 491 function jirafeau_is_viewable($mime)
 492 {
 493     if (!empty($mime)) {
 494         /* Actually, verify if mime-type is an image or a text. */
 495         $viewable = array('image', 'text', 'video', 'audio');
 496         $decomposed = explode('/', $mime);
 497         return in_array($decomposed[0], $viewable);
 498     }
 499     return false;
 500 }
 501
 502 // Error handling functions.
 503 //! Global array that contains all registered errors.
 504 $error_list = array();
 505
 506 /**
 507  * Adds an error to the list of errors.
 508  * @param $title the error's title
 509  * @param $description is a human-friendly description of the problem.
 510  */
 511 function add_error($title, $description)
 512 {
 513     global $error_list;
 514     $error_list[] = '<p>' . $title. '<br />' . $description. '</p>';
 515 }
 516
 517 /**
 518  * Informs whether any error has been registered yet.
 519  * @return true if there are errors.
 520  */
 521 function has_error()
 522 {
 523     global $error_list;
 524     return !empty($error_list);
 525 }
 526
 527 /**
 528  * Displays all the errors.
 529  */
 530 function show_errors()
 531 {
 532     if (has_error()) {
 533         global $error_list;
 534         echo '<div class="error">';
 535         foreach ($error_list as $error) {
 536             echo $error;
 537         }
 538         echo '</div>';
 539     }
 540 }
 541
 542 function check_errors($cfg)
 543 {
 544     if (file_exists(JIRAFEAU_ROOT . 'install.php')
 545         && !($cfg['installation_done'] === true)) {
 546         header('Location: install.php');
 547         exit;
 548     }
 549
 550     /* Checking for errors. */
 551     if (!is_writable(VAR_FILES)) {
 552         add_error(t('FILE_DIR_W'), VAR_FILES);
 553     }
 554
 555     if (!is_writable(VAR_LINKS)) {
 556         add_error(t('LINK_DIR_W'), VAR_LINKS);
 557     }
 558
 559     if (!is_writable(VAR_ASYNC)) {
 560         add_error(t('ASYNC_DIR_W'), VAR_ASYNC);
 561     }
 562 }
 563
 564 /**
 565  * Read link informations
 566  * @return array containing informations.
 567  */
 568 function jirafeau_get_link($hash)
 569 {
 570     $out = array();
 571     $link = VAR_LINKS . s2p("$hash") . $hash;
 572
 573     if (!file_exists($link)) {
 574         return $out;
 575     }
 576
 577     $c = file($link);
 578     $out['file_name'] = trim($c[0]);
 579     $out['mime_type'] = trim($c[1]);
 580     $out['file_size'] = trim($c[2]);
 581     $out['key'] = trim($c[3], NL);
 582     $out['time'] = trim($c[4]);
 583     $out['hash'] = trim($c[5]);
 584     $out['onetime'] = trim($c[6]);
 585     $out['upload_date'] = trim($c[7]);
 586     $out['ip'] = trim($c[8]);
 587     $out['link_code'] = trim($c[9]);
 588     $out['crypted'] = trim($c[10]) == 'C';
 589
 590     return $out;
 591 }
 592
 593 /**
 594  * List files in admin interface.
 595  */
 596 function jirafeau_admin_list($name, $file_hash, $link_hash)
 597 {
 598     echo '<fieldset><legend>';
 599     if (!empty($name)) {
 600         echo t('FILENAME') . ": " . jirafeau_escape($name);
 601     }
 602     if (!empty($file_hash)) {
 603         echo t('FILE') . ": " . jirafeau_escape($file_hash);
 604     }
 605     if (!empty($link_hash)) {
 606         echo t('LINK') . ": " . jirafeau_escape($link_hash);
 607     }
 608     if (empty($name) && empty($file_hash) && empty($link_hash)) {
 609         echo t('LS_FILES');
 610     }
 611     echo '</legend>';
 612     echo '<table border="1" width="1100">';
 613     echo '<tr>';
 614     echo '<th>' . t('FILENAME') . '</th>';
 615     echo '<th>' . t('TYPE') . '</th>';
 616     echo '<th>' . t('SIZE') . '</th>';
 617     echo '<th>' . t('EXPIRE') . '</th>';
 618     echo '<th>' . t('ONETIME') . '</th>';
 619     echo '<th>' . t('UPLOAD_DATE') . '</th>';
 620     echo '<th>' . t('ORIGIN') . '</th>';
 621     echo '<th>' . t('ACTION') . '</th>';
 622     echo '</tr>';
 623
 624     /* Get all links files. */
 625     $stack = array(VAR_LINKS);
 626     while (($d = array_shift($stack)) && $d != null) {
 627         $dir = scandir($d);
 628         foreach ($dir as $node) {
 629             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 630                 preg_match('/\.tmp/i', "$node")) {
 631                 continue;
 632             }
 633             if (is_dir($d . $node)) {
 634                 /* Push new found directory. */
 635                 $stack[] = $d . $node . '/';
 636             } elseif (is_file($d . $node)) {
 637                 /* Read link informations. */
 638                 $l = jirafeau_get_link($node);
 639                 if (!count($l)) {
 640                     continue;
 641                 }
 642
 643                 /* Filter. */
 644                 if (!empty($name) && !@preg_match("/$name/i", jirafeau_escape($l['file_name']))) {
 645                     continue;
 646                 }
 647                 if (!empty($file_hash) && $file_hash != $l['hash']) {
 648                     continue;
 649                 }
 650                 if (!empty($link_hash) && $link_hash != $node) {
 651                     continue;
 652                 }
 653                 /* Print link informations. */
 654                 echo '<tr>';
 655                 echo '<td>' .
 656                 '<strong><a id="upload_link" href="f.php?h='. jirafeau_escape($node) .'" title="' .
 657                     t('DL_PAGE') . '">' . jirafeau_escape($l['file_name']) . '</a></strong>';
 658                 echo '</td>';
 659                 echo '<td>' . jirafeau_escape($l['mime_type']) . '</td>';
 660                 echo '<td>' . jirafeau_human_size($l['file_size']) . '</td>';
 661                 echo '<td>' . ($l['time'] == -1 ? '∞' : jirafeau_get_datetimefield($l['time'])) . '</td>';
 662                 echo '<td>';
 663                 if ($l['onetime'] == 'O') {
 664                     echo 'Y';
 665                 } else {
 666                     echo 'N';
 667                 }
 668                 echo '</td>';
 669                 echo '<td>' . jirafeau_get_datetimefield($l['upload_date']) . '</td>';
 670                 echo '<td>' . $l['ip'] . '</td>';
 671                 echo '<td>' .
 672                 '<form method="post">' .
 673                 '<input type = "hidden" name = "action" value = "download"/>' .
 674                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 675                 jirafeau_admin_csrf_field() .
 676                 '<input type = "submit" value = "' . t('DL') . '" />' .
 677                 '</form>' .
 678                 '<form method="post">' .
 679                 '<input type = "hidden" name = "action" value = "delete_link"/>' .
 680                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 681                 jirafeau_admin_csrf_field() .
 682                 '<input type = "submit" value = "' . t('DEL_LINK') . '" />' .
 683                 '</form>' .
 684                 '<form method="post">' .
 685                 '<input type = "hidden" name = "action" value = "delete_file"/>' .
 686                 '<input type = "hidden" name = "hash" value = "' . $l['hash'] . '"/>' .
 687                 jirafeau_admin_csrf_field() .
 688                 '<input type = "submit" value = "' . t('DEL_FILE_LINKS') . '" />' .
 689                 '</form>' .
 690                 '</td>';
 691                 echo '</tr>';
 692             }
 693         }
 694     }
 695     echo '</table></fieldset>';
 696 }
 697
 698 /**
 699  * Clean expired files.
 700  * @return number of cleaned files.
 701  */
 702 function jirafeau_admin_clean()
 703 {
 704     $count = 0;
 705     /* Get all links files. */
 706     $stack = array(VAR_LINKS);
 707     while (($d = array_shift($stack)) && $d != null) {
 708         $dir = scandir($d);
 709
 710         foreach ($dir as $node) {
 711             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 712                 preg_match('/\.tmp/i', "$node")) {
 713                 continue;
 714             }
 715
 716             if (is_dir($d . $node)) {
 717                 /* Push new found directory. */
 718                 $stack[] = $d . $node . '/';
 719             } elseif (is_file($d . $node)) {
 720                 /* Read link informations. */
 721                 $l = jirafeau_get_link(basename($node));
 722                 if (!count($l)) {
 723                     continue;
 724                 }
 725                 $p = s2p($l['hash']);
 726                 if ($l['time'] > 0 && $l['time'] < time() || // expired
 727                     !file_exists(VAR_FILES . $p . $l['hash']) || // invalid
 728                     !file_exists(VAR_FILES . $p . $l['hash'] . '_count')) { // invalid
 729                     jirafeau_delete_link($node);
 730                     $count++;
 731                 }
 732             }
 733         }
 734     }
 735     return $count;
 736 }
 737
 738
 739 /**
 740  * Clean old async transferts.
 741  * @return number of cleaned files.
 742  */
 743 function jirafeau_admin_clean_async()
 744 {
 745     $count = 0;
 746     /* Get all links files. */
 747     $stack = array(VAR_ASYNC);
 748     while (($d = array_shift($stack)) && $d != null) {
 749         $dir = scandir($d);
 750
 751         foreach ($dir as $node) {
 752             if (strcmp($node, '.') == 0 || strcmp($node, '..') == 0 ||
 753                 preg_match('/\.tmp/i', "$node")) {
 754                 continue;
 755             }
 756
 757             if (is_dir($d . $node)) {
 758                 /* Push new found directory. */
 759                 $stack[] = $d . $node . '/';
 760             } elseif (is_file($d . $node)) {
 761                 /* Read async informations. */
 762                 $a = jirafeau_get_async_ref(basename($node));
 763                 if (!count($a)) {
 764                     continue;
 765                 }
 766                 /* Delete transferts older than 1 hour. */
 767                 if (time() - $a['last_edited'] > 3600) {
 768                     jirafeau_async_delete(basename($node));
 769                     $count++;
 770                 }
 771             }
 772         }
 773     }
 774     return $count;
 775 }
 776 /**
 777  * Read async transfert informations
 778  * @return array containing informations.
 779  */
 780 function jirafeau_get_async_ref($ref)
 781 {
 782     $out = array();
 783     $refinfos = VAR_ASYNC . s2p("$ref") . "$ref";
 784
 785     if (!file_exists($refinfos)) {
 786         return $out;
 787     }
 788
 789     $c = file($refinfos);
 790     $out['file_name'] = trim($c[0]);
 791     $out['mime_type'] = trim($c[1]);
 792     $out['key'] = trim($c[2], NL);
 793     $out['time'] = trim($c[3]);
 794     $out['onetime'] = trim($c[4]);
 795     $out['ip'] = trim($c[5]);
 796     $out['last_edited'] = trim($c[6]);
 797     $out['next_code'] = trim($c[7]);
 798     return $out;
 799 }
 800
 801 /**
 802  * Delete async transfert informations
 803  */
 804 function jirafeau_async_delete($ref)
 805 {
 806     $p = s2p("$ref");
 807     if (file_exists(VAR_ASYNC . $p . $ref)) {
 808         unlink(VAR_ASYNC . $p . $ref);
 809     }
 810     if (file_exists(VAR_ASYNC . $p . $ref . '_data')) {
 811         unlink(VAR_ASYNC . $p . $ref . '_data');
 812     }
 813     $parse = VAR_ASYNC . $p;
 814     $scan = array();
 815     while (file_exists($parse)
 816            && ($scan = scandir($parse))
 817            && count($scan) == 2 // '.' and '..' folders => empty.
 818            && basename($parse) != basename(VAR_ASYNC)) {
 819         rmdir($parse);
 820         $parse = substr($parse, 0, strlen($parse) - strlen(basename($parse)) - 1);
 821     }
 822 }
 823
 824 /**
 825   * Init a new asynchronous upload.
 826   * @param $finename Name of the file to send
 827   * @param $one_time One time upload parameter
 828   * @param $key eventual password (or blank)
 829   * @param $time time limit
 830   * @param $ip ip address of the client
 831   * @return a string containing a temporary reference followed by a code or the string 'Error'
 832   */
 833 function jirafeau_async_init($filename, $type, $one_time, $key, $time, $ip)
 834 {
 835     $res = 'Error';
 836
 837     /* Create temporary folder. */
 838     $ref;
 839     $p;
 840     $code = jirafeau_gen_random(4);
 841     do {
 842         $ref = jirafeau_gen_random(32);
 843         $p = VAR_ASYNC . s2p($ref);
 844     } while (file_exists($p));
 845     @mkdir($p, 0755, true);
 846     if (!file_exists($p)) {
 847         echo 'Error';
 848         return;
 849     }
 850
 851     /* md5 password or empty */
 852     $password = '';
 853     if (!empty($key)) {
 854         $password = md5($key);
 855     }
 856
 857     /* Store informations. */
 858     $p .= $ref;
 859     $handle = fopen($p, 'w');
 860     fwrite($handle,
 861             str_replace(NL, '', trim($filename)) . NL .
 862             str_replace(NL, '', trim($type)) . NL . $password . NL .
 863             $time . NL . ($one_time ? 'O' : 'R') . NL . $ip . NL .
 864             time() . NL . $code . NL);
 865     fclose($handle);
 866
 867     return $ref . NL . $code ;
 868 }
 869
 870 /**
 871   * Append a piece of file on the asynchronous upload.
 872   * @param $ref asynchronous upload reference
 873   * @param $file piece of data
 874   * @param $code client code for this operation
 875   * @param $max_file_size maximum allowed file size
 876   * @return a string containing a next code to use or the string "Error"
 877   */
 878 function jirafeau_async_push($ref, $data, $code, $max_file_size)
 879 {
 880     /* Get async infos. */
 881     $a = jirafeau_get_async_ref($ref);
 882
 883     /* Check some errors. */
 884     if (count($a) == 0
 885         || $a['next_code'] != "$code"
 886         || empty($data['tmp_name'])
 887         || !is_uploaded_file($data['tmp_name'])) {
 888         return 'Error';
 889     }
 890
 891     $p = s2p($ref);
 892
 893     /* File path. */
 894     $r_path = $data['tmp_name'];
 895     $w_path = VAR_ASYNC . $p . $ref . '_data';
 896
 897     /* Check that file size is not above upload limit. */
 898     if ($max_file_size > 0 &&
 899         filesize($r_path) + filesize($w_path) > $max_file_size * 1024 * 1024) {
 900         jirafeau_async_delete($ref);
 901         return 'Error';
 902     }
 903
 904     /* Concatenate data. */
 905     $r = fopen($r_path, 'r');
 906     $w = fopen($w_path, 'a');
 907     while (!feof($r)) {
 908         if (fwrite($w, fread($r, 1024)) === false) {
 909             fclose($r);
 910             fclose($w);
 911             jirafeau_async_delete($ref);
 912             return 'Error';
 913         }
 914     }
 915     fclose($r);
 916     fclose($w);
 917     unlink($r_path);
 918
 919     /* Update async file. */
 920     $code = jirafeau_gen_random(4);
 921     $handle = fopen(VAR_ASYNC . $p . $ref, 'w');
 922     fwrite($handle,
 923             $a['file_name'] . NL. $a['mime_type'] . NL. $a['key'] . NL .
 924             $a['time'] . NL . $a['onetime'] . NL . $a['ip'] . NL .
 925             time() . NL . $code . NL);
 926     fclose($handle);
 927     return $code;
 928 }
 929
 930 /**
 931   * Finalyze an asynchronous upload.
 932   * @param $ref asynchronous upload reference
 933   * @param $code client code for this operation
 934   * @param $crypt boolean asking to crypt or not
 935   * @param $link_name_length link name length
 936   * @return a string containing the download reference followed by a delete code or the string 'Error'
 937   */
 938 function jirafeau_async_end($ref, $code, $crypt, $link_name_length, $file_hash_method)
 939 {
 940     /* Get async infos. */
 941     $a = jirafeau_get_async_ref($ref);
 942     if (count($a) == 0
 943         || $a['next_code'] != "$code") {
 944         return "Error";
 945     }
 946
 947     /* Generate link infos. */
 948     $p = VAR_ASYNC . s2p($ref) . $ref . "_data";
 949     if (!file_exists($p)) {
 950         return 'Error';
 951     }
 952
 953     $crypted = false;
 954     $crypt_key = '';
 955     if ($crypt == true && extension_loaded('mcrypt') == true) {
 956         $crypt_key = jirafeau_encrypt_file($p, $p);
 957         if (strlen($crypt_key) > 0) {
 958             $crypted = true;
 959         }
 960     }
 961
 962     $hash = jirafeau_hash_file($file_hash_method, $p);
 963     $size = filesize($p);
 964     $np = s2p($hash);
 965     $delete_link_code = jirafeau_gen_random(5);
 966
 967     /* File already exist ? */
 968     if (!file_exists(VAR_FILES . $np)) {
 969         @mkdir(VAR_FILES . $np, 0755, true);
 970     }
 971     if (!file_exists(VAR_FILES . $np . $hash)) {
 972         rename($p, VAR_FILES . $np . $hash);
 973     }
 974
 975     /* Increment or create count file. */
 976     $counter = 0;
 977     if (file_exists(VAR_FILES . $np . $hash . '_count')) {
 978         $content = file(VAR_FILES . $np . $hash. '_count');
 979         $counter = trim($content[0]);
 980     }
 981     $counter++;
 982     $handle = fopen(VAR_FILES . $np . $hash. '_count', 'w');
 983     fwrite($handle, $counter);
 984     fclose($handle);
 985
 986     /* Create link. */
 987     $link_tmp_name =  VAR_LINKS . $hash . rand(0, 10000) . '.tmp';
 988     $handle = fopen($link_tmp_name, 'w');
 989     fwrite($handle,
 990             $a['file_name'] . NL . $a['mime_type'] . NL . $size . NL .
 991             $a['key'] . NL . $a['time'] . NL . $hash . NL . $a['onetime'] . NL .
 992             time() . NL . $a['ip'] . NL . $delete_link_code . NL . ($crypted ? 'C' : 'O'));
 993     fclose($handle);
 994     $hash_link = substr(base_16_to_64(md5_file($link_tmp_name)), 0, $link_name_length);
 995     $l = s2p("$hash_link");
 996     if (!@mkdir(VAR_LINKS . $l, 0755, true) ||
 997         !rename($link_tmp_name, VAR_LINKS . $l . $hash_link)) {
 998         echo "Error";
 999     }
1000
1001     /* Clean async upload. */
1002     jirafeau_async_delete($ref);
1003     return $hash_link . NL . $delete_link_code . NL . urlencode($crypt_key);
1004 }
1005
1006 function jirafeau_crypt_create_iv($base, $size)
1007 {
1008     $iv = '';
1009     while (strlen($iv) < $size) {
1010         $iv = $iv . $base;
1011     }
1012     $iv = substr($iv, 0, $size);
1013     return $iv;
1014 }
1015
1016 /**
1017  * Crypt file and returns decrypt key.
1018  * @param $fp_src file path to the file to crypt.
1019  * @param $fp_dst file path to the file to write crypted file (could be the same).
1020  * @return decrypt key composed of the key and the iv separated by a point ('.')
1021  */
1022 function jirafeau_encrypt_file($fp_src, $fp_dst)
1023 {
1024     $fs = filesize($fp_src);
1025     if ($fs === false || $fs == 0 || !(extension_loaded('mcrypt') == true)) {
1026         return '';
1027     }
1028
1029     /* Prepare module. */
1030     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1031     /* Generate key. */
1032     $crypt_key = jirafeau_gen_random(10);
1033     $hash_key = md5($crypt_key);
1034     $iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
1035     /* Init module. */
1036     mcrypt_generic_init($m, $hash_key, $iv);
1037     /* Crypt file. */
1038     $r = fopen($fp_src, 'r');
1039     $w = fopen($fp_dst, 'c');
1040     while (!feof($r)) {
1041         $enc = mcrypt_generic($m, fread($r, 1024));
1042         if (fwrite($w, $enc) === false) {
1043             return '';
1044         }
1045     }
1046     fclose($r);
1047     fclose($w);
1048     /* Cleanup. */
1049     mcrypt_generic_deinit($m);
1050     mcrypt_module_close($m);
1051     return $crypt_key;
1052 }
1053
1054 /**
1055  * Decrypt file.
1056  * @param $fp_src file path to the file to decrypt.
1057  * @param $fp_dst file path to the file to write decrypted file (could be the same).
1058  * @param $k string composed of the key and the iv separated by a point ('.')
1059  * @return key used to decrypt. a string of length 0 is returned if failed.
1060  */
1061 function jirafeau_decrypt_file($fp_src, $fp_dst, $k)
1062 {
1063     $fs = filesize($fp_src);
1064     if ($fs === false || $fs == 0 || extension_loaded('mcrypt') == false) {
1065         return false;
1066     }
1067
1068     /* Init module */
1069     $m = mcrypt_module_open('rijndael-256', '', 'ofb', '');
1070     /* Extract key and iv. */
1071     $crypt_key = $k;
1072     $hash_key = md5($crypt_key);
1073     $iv = jirafeau_crypt_create_iv($hash_key, mcrypt_enc_get_iv_size($m));
1074     /* Decrypt file. */
1075     $r = fopen($fp_src, 'r');
1076     $w = fopen($fp_dst, 'c');
1077     while (!feof($r)) {
1078         $dec = mdecrypt_generic($m, fread($r, 1024));
1079         if (fwrite($w, $dec) === false) {
1080             return false;
1081         }
1082     }
1083     fclose($r);
1084     fclose($w);
1085     /* Cleanup. */
1086     mcrypt_generic_deinit($m);
1087     mcrypt_module_close($m);
1088     return true;
1089 }
1090
1091 /**
1092  * Check if Jirafeau is password protected for visitors.
1093  * @return true if Jirafeau is password protected, false otherwise.
1094  */
1095 function jirafeau_has_upload_password($cfg)
1096 {
1097     return count($cfg['upload_password']) > 0;
1098 }
1099
1100 /**
1101  * Challenge password for a visitor.
1102  * @param $password password to be challenged
1103  * @return true if password is valid, false otherwise.
1104  */
1105 function jirafeau_challenge_upload_password($cfg, $password)
1106 {
1107     if (!jirafeau_has_upload_password($cfg)) {
1108         return false;
1109     }
1110     foreach ($cfg['upload_password'] as $p) {
1111         if ($password == $p) {
1112             return true;
1113         }
1114     }
1115     return false;
1116 }
1117
1118 /**
1119  * Test if the given IP is whitelisted by the given list.
1120  *
1121  * @param $allowedIpList array of allowed IPs
1122  * @param $challengedIp IP to be challenged
1123  * @return true if IP is authorized, false otherwise.
1124  */
1125 function jirafeau_challenge_ip($allowedIpList, $challengedIp)
1126 {
1127     foreach ($allowedIpList as $i) {
1128         if ($i == $challengedIp) {
1129             return true;
1130         }
1131         // CIDR test for IPv4 only.
1132         if (strpos($i, '/') !== false) {
1133             list($subnet, $mask) = explode('/', $i);
1134             if ((ip2long($challengedIp) & ~((1 << (32 - $mask)) - 1)) == ip2long($subnet)) {
1135                 return true;
1136             }
1137         }
1138     }
1139     return false;
1140 }
1141
1142 /**
1143  * Check if Jirafeau has a restriction on the IP address for uploading.
1144  * @return true if uploading is IP restricted, false otherwise.
1145  */
1146 function jirafeau_upload_has_ip_restriction($cfg) {
1147     return count($cfg['upload_ip']) > 0;
1148 }
1149
1150 /**
1151  * Test if visitor's IP is authorized to upload at all.
1152  *
1153  * @param $cfg configuration
1154  * @param $challengedIp IP to be challenged
1155  * @return true if IP is authorized, false otherwise.
1156  */
1157 function jirafeau_challenge_upload_ip($cfg, $challengedIp)
1158 {
1159     // If no IP address have been listed, allow upload from any IP
1160     if (!jirafeau_upload_has_ip_restriction($cfg)) {
1161         return true;
1162     }
1163     return jirafeau_challenge_ip($cfg['upload_ip'], $challengedIp);
1164 }
1165
1166 /**
1167  * Test if visitor's IP is authorized to upload without a password.
1168  *
1169  * @param $cfg configuration
1170  * @param $challengedIp IP to be challenged
1171  * @return true if IP is authorized, false otherwise.
1172  */
1173 function jirafeau_challenge_upload_ip_without_password($cfg, $challengedIp)
1174 {
1175     return jirafeau_challenge_ip($cfg['upload_ip_nopassword'], $challengedIp);
1176 }
1177
1178 /**
1179  * Test if visitor's IP is authorized or password is supplied and authorized
1180  * @param $ip IP to be challenged
1181  * @param $password password to be challenged
1182  * @return true if access is valid, false otherwise.
1183  */
1184 function jirafeau_challenge_upload ($cfg, $ip, $password)
1185 {
1186     return jirafeau_challenge_upload_ip_without_password($cfg, $ip) ||
1187             (!jirafeau_has_upload_password($cfg) && !jirafeau_upload_has_ip_restriction($cfg)) ||
1188             (jirafeau_challenge_upload_password($cfg, $password) && jirafeau_challenge_upload_ip($cfg, $ip));
1189 }
1190
1191 /** Tell if we have some HTTP headers generated by a proxy */
1192 function has_http_forwarded()
1193 {
1194     return
1195         !empty($_SERVER['HTTP_X_FORWARDED_FOR']) ||
1196         !empty($_SERVER['http_X_forwarded_for']);
1197 }
1198
1199 /**
1200  * Generate IP list from HTTP headers generated by a proxy
1201  * @return  array of IP strings
1202  */
1203 function get_ip_list_http_forwarded()
1204 {
1205     $ip_list = array();
1206     if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
1207         $l = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
1208         if ($l === false) {
1209             return array();
1210         }
1211         foreach ($l as $ip) {
1212             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1213         }
1214     }
1215     if (!empty($_SERVER['http_X_forwarded_for'])) {
1216         $l = explode(',', $_SERVER['http_X_forwarded_for']);
1217         foreach ($l as $ip) {
1218             // Separate IP from port
1219             $ipa = explode(':', $ip);
1220             if ($ipa === false) {
1221                 continue;
1222             }
1223             $ip = $ipa[0];
1224             array_push($ip_list, preg_replace('/\s+/', '', $ip));
1225         }
1226     }
1227     return $ip_list;
1228 }
1229
1230 /**
1231  * Get the ip address of the client from REMOTE_ADDR
1232  * or from HTTP_X_FORWARDED_FOR if behind a proxy
1233  * @returns the client ip address
1234  */
1235 function get_ip_address($cfg)
1236 {
1237     $remote = $_SERVER['REMOTE_ADDR'];
1238     if (count($cfg['proxy_ip']) == 0 || !has_http_forwarded()) {
1239         return $remote;
1240     }
1241
1242     $ip_list = get_ip_list_http_forwarded();
1243     if (count($ip_list) == 0) {
1244         return $remote;
1245     }
1246
1247     foreach ($cfg['proxy_ip'] as $proxy_ip) {
1248         if ($remote != $proxy_ip) {
1249             continue;
1250         }
1251         // Take the last IP (the one which has been set by the defined proxy).
1252         return end($ip_list);
1253     }
1254     return $remote;
1255 }
1256
1257 /**
1258  * Convert hexadecimal string to base64
1259  */
1260 function hex_to_base64($hex)
1261 {
1262     $b = '';
1263     foreach (str_split($hex, 2) as $pair) {
1264         $b .= chr(hexdec($pair));
1265     }
1266     return base64_encode($b);
1267 }
1268
1269 /**
1270  * Replace markers in templates.
1271  *
1272  * Available markers have the scheme "###MARKERNAME###".
1273  *
1274  * @param $content string Template text with markers
1275  * @param $htmllinebreaks boolean Convert linebreaks to BR-Tags
1276  * @return Template with replaced markers
1277  */
1278 function jirafeau_replace_markers($content, $htmllinebreaks = false)
1279 {
1280     $patterns = array(
1281         '/###ORGANISATION###/',
1282         '/###CONTACTPERSON###/',
1283         '/###WEBROOT###/'
1284     );
1285     $replacements = array(
1286         $GLOBALS['cfg']['organisation'],
1287         $GLOBALS['cfg']['contactperson'],
1288         $GLOBALS['cfg']['web_root']
1289     );
1290     $content = preg_replace($patterns, $replacements, $content);
1291
1292     if (true === $htmllinebreaks) {
1293         $content = nl2br($content);
1294     }
1295
1296     return $content;
1297 }
1298
1299 function jirafeau_escape($string)
1300 {
1301     return htmlspecialchars($string, ENT_QUOTES);
1302 }
1303
1304 function jirafeau_admin_session_start()
1305 {
1306     $_SESSION['admin_auth'] = true;
1307     $_SESSION['admin_csrf'] = md5(uniqid(mt_rand(), true));
1308 }
1309
1310 function jirafeau_admin_session_end()
1311 {
1312     $_SESSION = array();
1313     session_destroy();
1314 }
1315
1316 function jirafeau_admin_session_logged()
1317 {
1318     return isset($_SESSION['admin_auth']) &&
1319            isset($_SESSION['admin_csrf']) &&
1320            isset($_POST['admin_csrf']) &&
1321            $_SESSION['admin_auth'] === true &&
1322            $_SESSION['admin_csrf'] === $_POST['admin_csrf'];
1323 }
1324
1325 function jirafeau_admin_csrf_field()
1326 {
1327     return "<input type='hidden' name='admin_csrf' value='". $_SESSION['admin_csrf'] . "'/>";
1328 }