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) 2012  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 $p;
  32 }
  33
  34 function
  35 jirafeau_human_size ($octets)
  36 {
  37     $u = array ('B', 'KB', 'MB', 'GB', 'TB');
  38     $o = max ($octets, 0);
  39     $p = min (floor (($o ? log ($o) : 0) / log (1024)), count ($u) - 1);
  40     $o /= pow (1024, $p);
  41     return round ($o, 1) . $u[$p];
  42 }
  43
  44 function
  45 jirafeau_clean_rm_link ($link)
  46 {
  47     $p = s2p ("$link");
  48     if (file_exists (VAR_LINKS . $p . $link))
  49         unlink (VAR_LINKS . $p . $link);
  50     $parse = VAR_LINKS . $p;
  51     $scan = array();
  52     while (file_exists ($parse)
  53            && ($scan = scandir ($parse))
  54            && count ($scan) == 2 // '.' and '..' folders => empty.
  55            && basename ($parse) != basename (VAR_LINKS))
  56     {
  57         rmdir ($parse);
  58         $parse = substr ($parse, 0, strlen($parse) - strlen(basename ($parse)) - 1);
  59     }
  60 }
  61
  62 function
  63 jirafeau_clean_rm_file ($md5)
  64 {
  65     $p = s2p ("$md5");
  66     if (file_exists (VAR_FILES . $p . $md5))
  67         unlink (VAR_FILES . $p . $md5);
  68     if (file_exists (VAR_FILES . $p . $md5 . '_count'))
  69         unlink (VAR_FILES . $p . $md5 . '_count');
  70     $parse = VAR_FILES . $p;
  71     $scan = array();
  72     while (file_exists ($parse)
  73            && ($scan = scandir ($parse))
  74            && count ($scan) == 2 // '.' and '..' folders => empty.
  75            && basename ($parse) != basename (VAR_FILES))
  76     {
  77         rmdir ($parse);
  78         $parse = substr ($parse, 0, strlen($parse) - strlen(basename ($parse)) - 1);
  79     }
  80 }
  81
  82 /**
  83  * transforms a php.ini string representing a value in an integer
  84  * @param $value the value from php.ini
  85  * @returns an integer for this value
  86  */
  87 function jirafeau_ini_to_bytes ($value)
  88 {
  89     $modifier = substr ($value, -1);
  90     $bytes = substr ($value, 0, -1);
  91     switch (strtoupper ($modifier))
  92     {
  93     case 'P':
  94         $bytes *= 1024;
  95     case 'T':
  96         $bytes *= 1024;
  97     case 'G':
  98         $bytes *= 1024;
  99     case 'M':
 100         $bytes *= 1024;
 101     case 'K':
 102         $bytes *= 1024;
 103     default:
 104         break;
 105     }
 106     return $bytes;
 107 }
 108
 109 /**
 110  * gets the maximum upload size according to php.ini
 111  * @returns the maximum upload size string
 112  */
 113 function
 114 jirafeau_get_max_upload_size ()
 115 {
 116     return jirafeau_human_size(
 117             min (jirafeau_ini_to_bytes (ini_get ('post_max_size')),
 118                  jirafeau_ini_to_bytes (ini_get ('upload_max_filesize'))));
 119 }
 120
 121 /**
 122  * gets a string explaining the error
 123  * @param $code the error code
 124  * @returns a string explaining the error
 125  */
 126 function
 127 jirafeau_upload_errstr ($code)
 128 {
 129     switch ($code)
 130     {
 131     case UPLOAD_ERR_INI_SIZE:
 132     case UPLOAD_ERR_FORM_SIZE:
 133         return t('Your file exceeds the maximum authorized file size. ');
 134         break;
 135
 136     case UPLOAD_ERR_PARTIAL:
 137     case UPLOAD_ERR_NO_FILE:
 138         return
 139             t
 140             ('Your file was not uploaded correctly. You may succeed in retrying. ');
 141         break;
 142
 143     case UPLOAD_ERR_NO_TMP_DIR:
 144     case UPLOAD_ERR_CANT_WRITE:
 145     case UPLOAD_ERR_EXTENSION:
 146         return t('Internal error. You may not succeed in retrying. ');
 147         break;
 148
 149     default:
 150         break;
 151     }
 152     return t('Unknown error. ');
 153 }
 154
 155 /** Remove link and it's file
 156  * @param $link the link's name (hash)
 157  */
 158
 159 function
 160 jirafeau_delete_link ($link)
 161 {
 162     $l = jirafeau_get_link ($link);
 163     if (!count ($l))
 164         return;
 165
 166     jirafeau_clean_rm_link ($link);
 167
 168     $md5 = $l['md5'];
 169     $p = s2p ("$md5");
 170
 171     $counter = 1;
 172     if (file_exists (VAR_FILES . $p . $md5. '_count'))
 173     {
 174         $content = file (VAR_FILES . $p . $md5. '_count');
 175         $counter = trim ($content[0]);
 176     }
 177     $counter--;
 178
 179     if ($counter >= 1)
 180     {
 181         $handle = fopen (VAR_FILES . $p . $md5. '_count', 'w');
 182         fwrite ($handle, $counter);
 183         fclose ($handle);
 184     }
 185
 186     if ($counter == 0)
 187         jirafeau_clean_rm_file ($md5);
 188 }
 189
 190 /**
 191  * Delete a file and it's links.
 192  */
 193 function
 194 jirafeau_delete_file ($md5)
 195 {
 196     $count = 0;
 197     /* Get all links files. */
 198     $stack = array (VAR_LINKS);
 199     while (($d = array_shift ($stack)) && $d != NULL)
 200     {
 201         $dir = scandir ($d);
 202
 203         foreach ($dir as $node)
 204         {
 205             if (strcmp ($node, '.') == 0 || strcmp ($node, '..') == 0 ||
 206                 preg_match ('/\.tmp/i', "$node"))
 207                 continue;
 208
 209             if (is_dir ($d . $node))
 210             {
 211                 /* Push new found directory. */
 212                 $stack[] = $d . $node . '/';
 213             }
 214             elseif (is_file ($d . $node))
 215             {
 216                 /* Read link informations. */
 217                 $l = jirafeau_get_link (basename ($node));
 218                 if (!count ($l))
 219                     continue;
 220                 if ($l['md5'] == $md5)
 221                 {
 222                     $count++;
 223                     jirafeau_delete_link ($node);
 224                 }
 225             }
 226         }
 227     }
 228     jirafeau_clean_rm_file ($md5);
 229     return $count;
 230 }
 231
 232 /**
 233  * handles an uploaded file
 234  * @param $file the file struct given by $_FILE[]
 235  * @param $one_time_download is the file a one time download ?
 236  * @param $key if not empty, protect the file with this key
 237  * @param $time the time of validity of the file
 238  * @param $ip uploader's ip
 239  * @returns an array containing some information
 240  *   'error' => information on possible errors
 241  *   'link' => the link name of the uploaded file
 242  *   'delete_link' => the link code to delete file
 243  */
 244 function
 245 jirafeau_upload ($file, $one_time_download, $key, $time, $ip)
 246 {
 247     if (empty ($file['tmp_name']) || !is_uploaded_file ($file['tmp_name']))
 248     {
 249         return (array(
 250                  'error' =>
 251                    array ('has_error' => true,
 252                           'why' => jirafeau_upload_errstr ($file['error'])),
 253                  'link' => '',
 254                  'delete_link' => ''));
 255     }
 256
 257     /* array representing no error */
 258     $noerr = array ('has_error' => false, 'why' => '');
 259
 260     /* file informations */
 261     $md5 = md5_file ($file['tmp_name']);
 262     $name = trim ($file['name']);
 263     $mime_type = $file['type'];
 264     $size = $file['size'];
 265
 266     /* does file already exist ? */
 267     $rc = false;
 268     $p = s2p ("$md5");
 269     if (file_exists (VAR_FILES . $p .  $md5))
 270     {
 271         $rc = unlink ($file['tmp_name']);
 272     }
 273     elseif ((file_exists (VAR_FILES . $p) || @mkdir (VAR_FILES . $p, 0755, true))
 274             && move_uploaded_file ($file['tmp_name'], VAR_FILES . $p . $md5))
 275     {
 276         $rc = true;
 277     }
 278     if (!$rc)
 279     {
 280         return (array(
 281                  'error' =>
 282                    array ('has_error' => true,
 283                           'why' => t('Internal error during file creation.')),
 284                  'link' =>'',
 285                  'delete_link' => ''));
 286     }
 287
 288     /* increment or create count file */
 289     $counter = 0;
 290     if (file_exists (VAR_FILES . $p . $md5 . '_count'))
 291     {
 292         $content = file (VAR_FILES . $p . $md5. '_count');
 293         $counter = trim ($content[0]);
 294     }
 295     $counter++;
 296     $handle = fopen (VAR_FILES . $p . $md5. '_count', 'w');
 297     fwrite ($handle, $counter);
 298     fclose ($handle);
 299
 300     /* Create delete code. */
 301     $delete_link_code = 0;
 302     for ($i = 0; $i < 8; $i++)
 303         $delete_link_code .= dechex (rand (0, 16));
 304
 305     /* md5 password or empty */
 306     $password = '';
 307     if (!empty ($key))
 308         $password = md5 ($key);
 309
 310     /* create link file */
 311     $link_tmp_name =  VAR_LINKS . $md5 . rand (0, 10000) . ' .tmp';
 312     $handle = fopen ($link_tmp_name, 'w');
 313     fwrite ($handle,
 314             $name . NL. $mime_type . NL. $size . NL. $password . NL. $time .
 315             NL . $md5. NL . ($one_time_download ? 'O' : 'R') . NL.date ('U') .
 316             NL. $ip . NL. $delete_link_code . NL);
 317     fclose ($handle);
 318     $md5_link = md5_file ($link_tmp_name);
 319     $l = s2p ("$md5_link");
 320     if (!@mkdir (VAR_LINKS . $l, 0755, true) ||
 321         !rename ($link_tmp_name,  VAR_LINKS . $l . $md5_link))
 322     {
 323         if (file_exists ($link_tmp_name))
 324             unlink ($link_tmp_name);
 325
 326         $counter--;
 327         if ($counter >= 1)
 328         {
 329             $handle = fopen (VAR_FILES . $p . $md5. '_count', 'w');
 330             fwrite ($handle, $counter);
 331             fclose ($handle);
 332         }
 333         else
 334         {
 335             jirafeau_clean_rm_file ($md5_link);
 336         }
 337         return (array(
 338                  'error' =>
 339                    array ('has_error' => true,
 340                           'why' => t('Internal error during file creation. ')),
 341                  'link' =>'',
 342                  'delete_link' => ''));
 343     }
 344    return (array ('error' => $noerr,
 345                   'link' => $md5_link,
 346                   'delete_link' => $delete_link_code));
 347 }
 348
 349 /**
 350  * tells if a mime-type is viewable in a browser
 351  * @param $mime the mime type
 352  * @returns a boolean telling if a mime type is viewable
 353  */
 354 function
 355 jirafeau_is_viewable ($mime)
 356 {
 357     if (!empty ($mime))
 358     {
 359         /* Actually, verify if mime-type is an image or a text. */
 360         $viewable = array ('image', 'text');
 361         $decomposed = explode ('/', $mime);
 362         return in_array ($decomposed[0], $viewable);
 363     }
 364     return false;
 365 }
 366
 367
 368 // Error handling functions.
 369 //! Global array that contains all registered errors.
 370 $error_list = array ();
 371
 372 /**
 373  * Adds an error to the list of errors.
 374  * @param $title the error's title
 375  * @param $description is a human-friendly description of the problem.
 376  */
 377 function
 378 add_error ($title, $description)
 379 {
 380     global $error_list;
 381     $error_list[] = '<p>' . $title. '<br />' . $description. '</p>';
 382 }
 383
 384 /**
 385  * Informs whether any error has been registered yet.
 386  * @return true if there are errors.
 387  */
 388 function
 389 has_error ()
 390 {
 391     global $error_list;
 392     return !empty ($error_list);
 393 }
 394
 395 /**
 396  * Displays all the errors.
 397  */
 398 function
 399 show_errors ()
 400 {
 401     if (has_error ())
 402     {
 403         global $error_list;
 404         echo '<div class="error">';
 405         foreach ($error_list as $error)
 406         {
 407             echo $error;
 408         }
 409         echo '</div>';
 410     }
 411 }
 412
 413 /**
 414  * Read link informations
 415  * @return array containing informations.
 416  */
 417 function
 418 jirafeau_get_link ($hash)
 419 {
 420     $out = array ();
 421     $link = VAR_LINKS . s2p ("$hash") . $hash;
 422
 423     if (!file_exists ($link))
 424         return $out;
 425
 426     $c = file ($link);
 427     $out['file_name'] = trim ($c[0]);
 428     $out['mime_type'] = trim ($c[1]);
 429     $out['file_size'] = trim ($c[2]);
 430     $out['key'] = trim ($c[3], NL);
 431     $out['time'] = trim ($c[4]);
 432     $out['md5'] = trim ($c[5]);
 433     $out['onetime'] = trim ($c[6]);
 434     $out['upload_date'] = trim ($c[7]);
 435     $out['ip'] = trim ($c[8]);
 436     $out['link_code'] = trim ($c[9]);
 437
 438     return $out;
 439 }
 440
 441 /**
 442  * List files in admin interface.
 443  */
 444 function
 445 jirafeau_admin_list ($name, $file_hash, $link_hash)
 446 {
 447     echo '<fieldset><legend>';
 448     if (!empty ($name))
 449         echo t('Filename') . ": $name ";
 450     if (!empty ($file_hash))
 451         echo t('file') . ": $file_hash ";
 452     if (!empty ($link_hash))
 453         echo t('link') . ": $link_hash ";
 454     if (empty ($name) && empty ($file_hash) && empty ($link_hash))
 455         echo t('List all files');
 456     echo '</legend>';
 457     echo '<table>';
 458     echo '<tr>';
 459     echo '<td>' . t('Filename') . '</td>';
 460     echo '<td>' . t('Type') . '</td>';
 461     echo '<td>' . t('Size') . '</td>';
 462     echo '<td>' . t('Expire') . '</td>';
 463     echo '<td>' . t('Onetime') . '</td>';
 464     echo '<td>' . t('Upload date') . '</td>';
 465     echo '<td>' . t('Origin') . '</td>';
 466     echo '<td>' . t('Action') . '</td>';
 467     echo '</tr>';
 468
 469     /* Get all links files. */
 470     $stack = array (VAR_LINKS);
 471     while (($d = array_shift ($stack)) && $d != NULL)
 472     {
 473         $dir = scandir ($d);
 474         foreach ($dir as $node)
 475         {
 476             if (strcmp ($node, '.') == 0 || strcmp ($node, '..') == 0 ||
 477                 preg_match ('/\.tmp/i', "$node"))
 478                 continue;
 479             if (is_dir ($d . $node))
 480             {
 481                 /* Push new found directory. */
 482                 $stack[] = $d . $node . '/';
 483             }
 484             elseif (is_file ($d . $node))
 485             {
 486                 /* Read link informations. */
 487                 $l = jirafeau_get_link ($node);
 488                 if (!count ($l))
 489                     continue;
 490
 491                 /* Filter. */
 492                 if (!empty ($name) && !preg_match ("/$name/i", $l['file_name']))
 493                     continue;
 494                 if (!empty ($file_hash) && $file_hash != $l['md5'])
 495                     continue;
 496                 if (!empty ($link_hash) && $link_hash != $node)
 497                     continue;
 498                 /* Print link informations. */
 499                 echo '<tr>';
 500                 echo '<td>' .
 501                 '<form action = "admin.php" method = "post">' .
 502                 '<input type = "hidden" name = "action" value = "download"/>' .
 503                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 504                 '<input type = "submit" value = "' . $l['file_name'] . '" />' .
 505                 '</form>';
 506                 echo '</td>';
 507                 echo '<td>' . $l['mime_type'] . '</td>';
 508                 echo '<td>' . jirafeau_human_size ($l['file_size']) . '</td>';
 509                 echo '<td>' . ($l['time'] == -1 ? '' : strftime ('%c', $l['time'])) .
 510                      '</td>';
 511                 echo '<td>' . $l['onetime'] . '</td>';
 512                 echo '<td>' . strftime ('%c', $l['upload_date']) . '</td>';
 513                 echo '<td>' . $l['ip'] . '</td>';
 514                 echo '<td>' .
 515                 '<form action = "admin.php" method = "post">' .
 516                 '<input type = "hidden" name = "action" value = "delete_link"/>' .
 517                 '<input type = "hidden" name = "link" value = "' . $node . '"/>' .
 518                 '<input type = "submit" value = "' . t('Del link') . '" />' .
 519                 '</form>' .
 520                 '<form action = "admin.php" method = "post">' .
 521                 '<input type = "hidden" name = "action" value = "delete_file"/>' .
 522                 '<input type = "hidden" name = "md5" value = "' . $l['md5'] . '"/>' .
 523                 '<input type = "submit" value = "' . t('Del file and links') . '" />' .
 524                 '</form>' .
 525                 '</td>';
 526                 echo '</tr>';
 527             }
 528         }
 529     }
 530     echo '</table></fieldset>';
 531 }
 532
 533 /**
 534  * Clean expired files.
 535  * @return number of cleaned files.
 536  */
 537 function
 538 jirafeau_admin_clean ()
 539 {
 540     $count = 0;
 541     /* Get all links files. */
 542     $stack = array (VAR_LINKS);
 543     while (($d = array_shift ($stack)) && $d != NULL)
 544     {
 545         $dir = scandir ($d);
 546
 547         foreach ($dir as $node)
 548         {
 549             if (strcmp ($node, '.') == 0 || strcmp ($node, '..') == 0 ||
 550                 preg_match ('/\.tmp/i', "$node"))
 551                 continue;
 552
 553             if (is_dir ($d . $node))
 554             {
 555                 /* Push new found directory. */
 556                 $stack[] = $d . $node . '/';
 557             }
 558             elseif (is_file ($d . $node))
 559             {
 560                 /* Read link informations. */
 561                 $l = jirafeau_get_link (basename ($node));
 562                 if (!count ($l))
 563                     continue;
 564                 $p = s2p ($l['md5']);
 565                 if ($l['time'] > 0 && $l['time'] < time () || // expired
 566                     !file_exists (VAR_FILES . $p . $l['md5']) || // invalid
 567                     !file_exists (VAR_FILES . $p . $l['md5'] . '_count')) // invalid
 568                 {
 569                     jirafeau_delete_link ($node);
 570                     $count++;
 571                 }
 572             }
 573         }
 574     }
 575     return $count;
 576 }
 577 ?>