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  * transforms a php.ini string representing a value in an integer
  22  * @param $value the value from php.ini
  23  * @returns an integer for this value
  24  */
  25 function jirafeau_ini_to_bytes ($value)
  26 {
  27     $modifier = substr ($value, -1);
  28     $bytes = substr ($value, 0, -1);
  29     switch (strtoupper ($modifier))
  30     {
  31     case 'P':
  32         $bytes *= 1024;
  33     case 'T':
  34         $bytes *= 1024;
  35     case 'G':
  36         $bytes *= 1024;
  37     case 'M':
  38         $bytes *= 1024;
  39     case 'K':
  40         $bytes *= 1024;
  41     default:
  42         break;
  43     }
  44     return $bytes;
  45 }
  46
  47 /**
  48  * gets the maximum upload size according to php.ini
  49  * @returns the maximum upload size
  50  */
  51 function
  52 jirafeau_get_max_upload_size ()
  53 {
  54     return min (jirafeau_ini_to_bytes (ini_get ('post_max_size')),
  55                 jirafeau_ini_to_bytes (ini_get ('upload_max_filesize')));
  56 }
  57
  58 /**
  59  * gets a string explaining the error
  60  * @param $code the error code
  61  * @returns a string explaining the error
  62  */
  63 function
  64 jirafeau_upload_errstr ($code)
  65 {
  66     switch ($code)
  67     {
  68     case UPLOAD_ERR_INI_SIZE:
  69     case UPLOAD_ERR_FORM_SIZE:
  70         return _('Your file exceeds the maximum authorized file size. ');
  71         break;
  72
  73     case UPLOAD_ERR_PARTIAL:
  74     case UPLOAD_ERR_NO_FILE:
  75         return
  76             _
  77             ('Your file was not uploaded correctly. You may succeed in retrying. ');
  78         break;
  79
  80     case UPLOAD_ERR_NO_TMP_DIR:
  81     case UPLOAD_ERR_CANT_WRITE:
  82     case UPLOAD_ERR_EXTENSION:
  83         return _('Internal error. You may not succeed in retrying. ');
  84         break;
  85
  86     default:
  87         break;
  88     }
  89     return _('Unknown error. ');
  90 }
  91
  92 /** Remove link and it's file
  93  * @param $link the link's name (hash)
  94  */
  95
  96 function
  97 jirafeau_delete ($link)
  98 {
  99     if (!file_exists ( VAR_LINKS . $link))
 100         return;
 101
 102     $content = file (VAR_LINKS . $link);
 103     $md5 = trim ($content[5]);
 104     unlink (VAR_LINKS . $link);
 105
 106     $counter = 1;
 107     if (file_exists ( VAR_FILES . $md5. '_count'))
 108     {
 109         $content = file ( VAR_FILES . $md5. '_count');
 110         $counter = trim ($content[0]);
 111     }
 112     $counter--;
 113
 114     if ($counter >= 1)
 115     {
 116         $handle = fopen ( VAR_FILES . $md5. '_count', 'w');
 117         fwrite ($handle, $counter);
 118         fclose ($handle);
 119     }
 120
 121     if ($counter == 0)
 122     {
 123         if (file_exists (VAR_FILES . $md5))
 124             unlink ( VAR_FILES . $md5);
 125         if (file_exists (VAR_FILES . $md5 . '_count'))
 126         unlink ( VAR_FILES . $md5. '_count');
 127     }
 128 }
 129
 130 /**
 131  * Delete a file and it's links.
 132  */
 133 function
 134 jirafeau_delete_file ($md5)
 135 {
 136     $count = 0;
 137     $links_dir = scandir (VAR_LINKS);
 138
 139     foreach ($links_dir as $link)
 140     {
 141         if (strcmp ($link, '.') == 0 || strcmp ($link, '..') == 0 ||
 142             preg_match ('/\.tmp/i', "$link"))
 143             continue;
 144         /* Read link informations. */
 145         $l = jirafeau_get_link ($link);
 146         if ($l['md5'] == $md5)
 147         {
 148             $count++;
 149             jirafeau_delete ($link);
 150         }
 151     }
 152
 153     if (file_exists (VAR_FILES . $md5 . '_count'))
 154         unlink (VAR_FILES . $md5. '_count');
 155     if (file_exists (VAR_FILES . $md5))
 156         unlink (VAR_FILES . $md5);
 157
 158     return $count;
 159 }
 160
 161 /**
 162  * handles an uploaded file
 163  * @param $file the file struct given by $_FILE[]
 164  * @param $one_time_download is the file a one time download ?
 165  * @param $key if not empty, protect the file with this key
 166  * @param $time the time of validity of the file
 167  * @param $cfg the current configuration
 168  * @param $ip uploader's ip
 169  * @returns an array containing some information
 170  *   'error' => information on possible errors
 171  *   'link' => the link name of the uploaded file
 172  *   'delete_link' => the link code to delete file
 173  */
 174 function
 175 jirafeau_upload ($file, $one_time_download, $key, $time, $cfg, $ip)
 176 {
 177     if (empty ($file['tmp_name']) || !is_uploaded_file ($file['tmp_name']))
 178     {
 179         return (array(
 180                  'error' =>
 181                    array ('has_error' => true,
 182                           'why' => jirafeau_upload_errstr ($file['error'])),
 183                  'link' => '',
 184                  'delete_link' => ''));
 185     }
 186
 187     /* array representing no error */
 188     $noerr = array ('has_error' => false, 'why' => '');
 189
 190     /* file informations */
 191     $md5 = md5_file ($file['tmp_name']);
 192     $name = trim ($file['name']);
 193     $mime_type = $file['type'];
 194     $size = $file['size'];
 195
 196     /* does file already exist ? */
 197     $rc = false;
 198     if (file_exists ( VAR_FILES . $md5))
 199     {
 200         $rc = unlink ($file['tmp_name']);
 201     }
 202     elseif (move_uploaded_file ($file['tmp_name'],  VAR_FILES . $md5))
 203     {
 204         $rc = true;
 205     }
 206     if (!$rc)
 207     {
 208         return (array(
 209                  'error' =>
 210                    array ('has_error' => true,
 211                           'why' => _('Internal error during file creation. ')),
 212                  'link' =>'',
 213                  'delete_link' => ''));
 214     }
 215
 216     /* increment or create count file */
 217     $counter = 0;
 218     if (file_exists (VAR_FILES . $md5 . '_count'))
 219     {
 220         $content = file ( VAR_FILES . $md5. '_count');
 221         $counter = trim ($content[0]);
 222     }
 223     $counter++;
 224     $handle = fopen ( VAR_FILES . $md5. '_count', 'w');
 225     fwrite ($handle, $counter);
 226     fclose ($handle);
 227
 228     /* Create delete code. */
 229     $delete_link_code = 0;
 230     for ($i = 0; $i < 8; $i++)
 231         $delete_link_code .= dechex (rand (0, 16));
 232
 233     /* md5 password or empty */
 234     $password = '';
 235     if (!empty ($key))
 236         $password = md5 ($key);
 237
 238     /* create link file */
 239     $link_tmp_name =  VAR_LINKS . $md5.rand (0, 10000) . ' .tmp';
 240     $handle = fopen ($link_tmp_name, 'w');
 241     fwrite ($handle,
 242             $name . NL. $mime_type . NL. $size . NL. $password . NL. $time . NL . $md5.
 243             NL.($one_time_download ? 'O' : 'R') . NL.date ('U') . NL. $ip . NL.
 244             $delete_link_code . NL);
 245     fclose ($handle);
 246     $md5_link = md5_file ($link_tmp_name);
 247     if (!rename ($link_tmp_name,  VAR_LINKS . $md5_link))
 248     {
 249         unlink ($link_tmp_name);
 250         $counter--;
 251         if ($counter >= 1)
 252         {
 253             $handle = fopen ( VAR_FILES . $md5. '_count', 'w');
 254             fwrite ($handle, $counter);
 255             fclose ($handle);
 256         }
 257         else
 258         {
 259             unlink ( VAR_FILES . $md5. '_count');
 260             unlink ( VAR_FILES . $md5);
 261         }
 262         return (array(
 263                  'error' =>
 264                    array ('has_error' => true,
 265                           'why' => _('Internal error during file creation. ')),
 266                  'link' =>'',
 267                  'delete_link' => ''));
 268     }
 269    return (array ('error' => $noerr,
 270                   'link' => $md5_link,
 271                   'delete_link' => $delete_link_code));
 272 }
 273
 274 /**
 275  * tells if a mime-type is viewable in a browser
 276  * @param $mime the mime type
 277  * @returns a boolean telling if a mime type is viewable
 278  */
 279 function
 280 jirafeau_is_viewable ($mime)
 281 {
 282     if (!empty ($mime))
 283     {
 284         /* Actually, verify if mime-type is an image or a text. */
 285         $viewable = array ('image', 'text');
 286         $decomposed = explode ('/', $mime);
 287         return in_array ($decomposed[0], $viewable);
 288     }
 289     return false;
 290 }
 291
 292
 293 // Error handling functions.
 294 //! Global array that contains all registered errors.
 295 $error_list = array ();
 296
 297 /**
 298  * Adds an error to the list of errors.
 299  * @param $title the error's title
 300  * @param $description is a human-friendly description of the problem.
 301  */
 302 function
 303 add_error ($title, $description)
 304 {
 305     global $error_list;
 306     $error_list[] = '<p>' . $title. '<br />' . $description. '</p>';
 307 }
 308
 309 /**
 310  * Informs whether any error has been registered yet.
 311  * @return true if there are errors.
 312  */
 313 function
 314 has_error ()
 315 {
 316     global $error_list;
 317     return !empty ($error_list);
 318 }
 319
 320 /**
 321  * Displays all the errors.
 322  */
 323 function
 324 show_errors ()
 325 {
 326     if (has_error ())
 327     {
 328         global $error_list;
 329         echo '<div class="error">';
 330         foreach ($error_list as $error)
 331         {
 332             echo $error;
 333         }
 334         echo '</div>';
 335     }
 336 }
 337
 338 /**
 339  * Read link informations
 340  * @return array containing informations.
 341  */
 342 function
 343 jirafeau_get_link ($hash)
 344 {
 345     $out = array ();
 346     $link = VAR_LINKS . $hash;
 347
 348     if (!file_exists ($link))
 349         return $out;
 350
 351     $c = file ($link);
 352     $out['file_name'] = trim ($c[0]);
 353     $out['mime_type'] = trim ($c[1]);
 354     $out['file_size'] = trim ($c[2]);
 355     $out['key'] = trim ($c[3], NL);
 356     $out['time'] = trim ($c[4]);
 357     $out['md5'] = trim ($c[5]);
 358     $out['onetime'] = trim ($c[6]);
 359     $out['upload_date'] = trim ($c[7]);
 360     $out['ip'] = trim ($c[8]);
 361     $out['link_code'] = trim ($c[9]);
 362
 363     return $out;
 364 }
 365
 366 function
 367 jirafeau_human_size ($octets)
 368 {
 369     $u = array ('B', 'KB', 'MB', 'GB', 'TB');
 370     $o = max ($octets, 0);
 371     $p = min (floor (($o ? log ($o) : 0) / log (1024)), count ($u) - 1);
 372     $o /= pow (1024, $p);
 373     return round ($o, 1) . $u[$p];
 374 }
 375
 376 /**
 377  * List files in admin interface.
 378  */
 379 function
 380 jirafeau_admin_list ($name, $file_hash, $link_hash)
 381 {
 382     $links_dir = scandir (VAR_LINKS);
 383     echo '<fieldset><legend>';
 384     if (!empty ($name))
 385         echo $name . ' ';
 386     if (!empty ($file_hash))
 387         echo $file_hash . ' ';
 388     if (!empty ($link_hash))
 389         echo $link_hash . ' ';
 390     if (empty ($name) && empty ($file_hash) && empty ($link_hash))
 391         echo _('List all files');
 392     echo '</legend>';
 393     echo '<table>';
 394     echo '<tr>';
 395     echo '<td>' . _('Filename') . '</td>';
 396     echo '<td>' . _('Type') . '</td>';
 397     echo '<td>' . _('Size') . '</td>';
 398     echo '<td>' . _('Expire') . '</td>';
 399     echo '<td>' . _('Onetime') . '</td>';
 400     echo '<td>' . _('Upload date') . '</td>';
 401     echo '<td>' . _('Origin') . '</td>';
 402     echo '<td>' . _('Action') . '</td>';
 403     echo '</tr>';
 404     foreach ($links_dir as $link)
 405     {
 406         if (strcmp ($link, '.') == 0 || strcmp ($link, '..') == 0 ||
 407             preg_match ('/\.tmp/i', "$link"))
 408             continue;
 409         /* Read link informations. */
 410         $l = jirafeau_get_link ($link);
 411
 412         /* Filter. */
 413         if (!empty ($name) && $name != $l['file_name'])
 414             continue;
 415         if (!empty ($file_hash) && $file_hash != $l['md5'])
 416             continue;
 417         if (!empty ($link_hash) && $link_hash != $link)
 418             continue;
 419
 420         /* Print link informations. */
 421         echo '<tr>';
 422         echo '<td>' . $l['file_name'] . '</td>';
 423         echo '<td>' . $l['mime_type'] . '</td>';
 424         echo '<td>' . jirafeau_human_size ($l['file_size']) . '</td>';
 425         echo '<td>' . ($l['time'] == -1 ? '' : strftime ('%c', $l['time'])) .
 426              '</td>';
 427         echo '<td>' . $l['onetime'] . '</td>';
 428         echo '<td>' . strftime ('%c', $l['upload_date']) . '</td>';
 429         echo '<td>' . $l['ip'] . '</td>';
 430         echo '<td>' .
 431         '<form action = "admin.php" method = "post">' .
 432         '<input type = "hidden" name = "action" value = "delete_link"/>' .
 433         '<input type = "hidden" name = "link" value = "' . $link . '"/>' .
 434         '<input type = "submit" value = "' . _('Del link') . '" />' .
 435         '</form>' .
 436         '<form action = "admin.php" method = "post">' .
 437         '<input type = "hidden" name = "action" value = "delete_file"/>' .
 438         '<input type = "hidden" name = "md5" value = "' . $l['md5'] . '"/>' .
 439         '<input type = "submit" value = "' . _('Del file and links') . '" />' .
 440         '</form>' .
 441         '</td>';
 442         echo '</tr>';
 443     }
 444     echo '</table></fieldset>';
 445 }
 446
 447 /**
 448  * Clean expired files.
 449  * @return number of cleaned files.
 450  */
 451 function
 452 jirafeau_admin_clean ()
 453 {
 454     $c = 0;
 455     $links_dir = scandir (VAR_LINKS);
 456
 457     foreach ($links_dir as $link)
 458     {
 459         if (strcmp ($link, '.') == 0 || strcmp ($link, '..') == 0 ||
 460             preg_match ('/\.tmp/i', "$link"))
 461             continue;
 462         /* Read link informations. */
 463         $l = jirafeau_get_link ($link);
 464         if ($l['time'] > 0 && $l['time'] < time () || // expired
 465             !file_exists (VAR_FILES . $l['md5']) || // invalid
 466             !file_exists (VAR_FILES . $l['md5'] . '_count')) // invalid
 467         {
 468             jirafeau_delete ($link);
 469             $c++;
 470         }
 471     }
 472     return $c;
 473 }
 474 ?>