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<?php
/***************************************************************************\
* SPIP, Système de publication pour l'internet *
* *
* Copyright © avec tendresse depuis 2001 *
* Arnaud Martin, Antoine Pitrou, Philippe Rivière, Emmanuel Saint-James *
* *
* Ce programme est un logiciel libre distribué sous licence GNU/GPL. *
\***************************************************************************/
/**
* Gestion des emails et de leur envoi
*
* @package SPIP\Core\Fichier
**/
if (!defined('_ECRIRE_INC_VERSION')) {
return;
}
/**
* Envoyer un fichier dont on fourni le chemin, le mime type, en attachment ou non, avec un expire
*
* @uses spip_livrer_fichier_entetes()
* @uses spip_livrer_fichier_entier()
* @uses spip_livrer_fichier_partie()
*
* @param string $fichier
* @param string $content_type
* @param array $options
* bool|string $attachment
* int $expires
* int|null range
* @throws Exception
*/
function spip_livrer_fichier($fichier, $content_type = 'application/octet-stream', $options = []) {
$defaut = [
'attachment' => false,
'expires' => 3600,
'range' => null,
];
$options = array_merge($defaut, $options);
if (is_numeric($options['expires']) and $options['expires'] > 0) {
$options['expires'] = gmdate('D, d M Y H:i:s', time() + $options['expires']) . ' GMT';
}
if (is_null($options) and isset($_SERVER['HTTP_RANGE'])) {
$options['range'] = $_SERVER['HTTP_RANGE'];
}
spip_livrer_fichier_entetes($fichier, $content_type, ($options['attachment'] && !$options['range']) ? $options['attachment'] : false, $options['expires']);
if (!is_null($options['range'])) {
spip_livrer_fichier_partie($fichier, $options['range']);
}
else {
spip_livrer_fichier_entier($fichier);
}
}
/**
* Envoyer les entetes du fichier, sauf ce qui est lie au mode d'envoi (entier ou par parties)
*
* @see spip_livrer_fichier()
* @param string $fichier
* @param string $content_type
* @param bool|string $attachment
* @param int|string $expires
*/
function spip_livrer_fichier_entetes($fichier, $content_type = 'application/octet-stream', $attachment = false, $expires = 0) {
// toujours envoyer un content type, meme vide !
header('Accept-Ranges: bytes');
header('Content-Type: ' . $content_type);
if ($fs = stat($fichier)
and !empty($fs['size'])
and !empty($fs['mtime'])) {
header("Last-Modified: " . gmdate("D, d M Y H:i:s", $fs['mtime']) . " GMT");
header(sprintf('Etag: "%x-%x"', $fs['size'], str_pad($fs['mtime'], 16, "0")));
}
if ($attachment) {
$f = (is_string($attachment) ? $attachment : basename($fichier));
// ce content-type est necessaire pour eviter des corruptions de zip dans ie6
header('Content-Type: application/octet-stream');
header("Content-Disposition: attachment; filename=\"$f\";");
header('Content-Transfer-Encoding: binary');
// fix for IE caching or PHP bug issue
header('Expires: 0'); // set expiration time
header('Pragma: public');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
}
else {
$f = (is_string($attachment) ? $attachment : basename($fichier));
header("Content-Disposition: inline; filename=\"$f\";");
header('Expires: ' . $expires); // set expiration time
}
}
/**
* Envoyer les contenu entier du fichier
* @param string $fichier
*/
function spip_livrer_fichier_entier($fichier) {
if (!file_exists($fichier)) {
throw new \Exception(sprintf('File not found: %s', $fichier));
}
if (!is_readable($fichier)) {
throw new \Exception(sprintf('File not readable: %s', $fichier));
}
if ($size = filesize($fichier)) {
header(sprintf('Content-Length: %d', $size));
}
readfile($fichier);
exit();
}
/**
* Envoyer une partie du fichier
* Prendre en charge l'entete Range:bytes=0-456 utilise par les player medias
* source : https://github.com/pomle/php-serveFilePartial/blob/master/ServeFilePartial.inc.php
*
* @param string $fichier
* @param string $range
* @throws Exception
*/
function spip_livrer_fichier_partie($fichier, $range = null) {
if (!file_exists($fichier)) {
throw new \Exception(sprintf('File not found: %s', $fichier));
}
if (!is_readable($fichier)) {
throw new \Exception(sprintf('File not readable: %s', $fichier));
}
// Par defaut on envoie tout
$byteOffset = 0;
$byteLength = $fileSize = filesize($fichier);
// Parse Content-Range header for byte offsets, looks like "bytes=11525-" OR "bytes=11525-12451"
if ($range and preg_match('%bytes=(\d+)-(\d+)?%i', $range, $match)) {
### Offset signifies where we should begin to read the file
$byteOffset = (int)$match[1];
### Length is for how long we should read the file according to the browser, and can never go beyond the file size
if (isset($match[2])) {
$finishBytes = (int)$match[2];
$byteLength = $finishBytes + 1;
} else {
$finishBytes = $fileSize - 1;
}
$cr_header = sprintf('Content-Range: bytes %d-%d/%d', $byteOffset, $finishBytes, $fileSize);
}
else {
// si pas de range valide, on delegue a la methode d'envoi complet
spip_livrer_fichier_entier($fichier);
// redondant, mais facilite la comprehension du code
exit();
}
// Remove headers that might unnecessarily clutter up the output
header_remove('Cache-Control');
header_remove('Pragma');
// partial content
header('HTTP/1.1 206 Partial content');
header($cr_header); ### Decrease by 1 on byte-length since this definition is zero-based index of bytes being sent
$byteRange = $byteLength - $byteOffset;
header(sprintf('Content-Length: %d', $byteRange));
// Variable containing the buffer
$buffer = '';
// Just a reasonable buffer size
$bufferSize = 512 * 16;
// Contains how much is left to read of the byteRange
$bytePool = $byteRange;
if (!$handle = fopen($fichier, 'r')) {
throw new \Exception(sprintf('Could not get handle for file %s', $fichier));
}
if (fseek($handle, $byteOffset, SEEK_SET) == -1) {
throw new \Exception(sprintf('Could not seek to byte offset %d', $byteOffset));
}
while ($bytePool > 0) {
// How many bytes we request on this iteration
$chunkSizeRequested = min($bufferSize, $bytePool);
// Try readin $chunkSizeRequested bytes from $handle and put data in $buffer
$buffer = fread($handle, $chunkSizeRequested);
// Store how many bytes were actually read
$chunkSizeActual = strlen($buffer);
// If we didn't get any bytes that means something unexpected has happened since $bytePool should be zero already
if ($chunkSizeActual == 0) {
// For production servers this should go in your php error log, since it will break the output
trigger_error('Chunksize became 0', E_USER_WARNING);
break;
}
// Decrease byte pool with amount of bytes that were read during this iteration
$bytePool -= $chunkSizeActual;
// Write the buffer to output
print $buffer;
// Try to output the data to the client immediately
flush();
}
exit();
}