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<?php
define('EOL', "\r\n");
class HTTP_POST_multipart {
protected $_parts = array();
public function addData($name, $bytes) {
$this->_parts[] = array(
'name' => $name,
'data' => $bytes
);
}
public function addFile($name, $filename, $mimetype,
$charset, $encoding, $data) {
$this->_parts[] = array(
'name' => $name,
'filename' => $filename,
'mimetype' => $mimetype,
'charset' => $charset,
'encoding' => $encoding,
'data' => $data
);
}
protected static buildDataPart($part) {
return 'Content-Disposition: form-data; name="' . $part['name'] . '"' .
EOL . EOL . $part['data'] . EOL;
}
protected static buildFilePart($part) {
# build Content-Disposition
$p = 'Content-Disposition: form-data; name="' . $part['name'] . '"; ' .
'filename="' . $part['filename'] . '"' . EOL;
# build Content-Type
$p .= 'Content-Type: ' . $part['mimetype'];
if ($part['charset'] !== null) {
$p .= '; charset="' . $part['charset'] . '"';
}
$p .= EOL;
# build Content-Transfer-Encoding
$data = null;
if ($part['encoding'] !== null) {
$p .= 'Content-Transfer-Encoding: ' . $part['encoding'] . EOL;
switch ($part['encoding']) {
case 'binary':
$data = $part['data'];
break;
case 'base64':
$data = chunk_split(base64_encode($part['data']);
break;
default:
throw new Exception('unrecognized encoding: ' . $part['encoding']);
}
}
else {
$data = $part['data'];
}
# build data
$p .= EOL . $data . EOL;
return $p;
}
protected static buildBoundary($postParts) {
# This isn't guaranteed to terminate, but it's unlikely
# to need more than one iteration on any real input.
while (1) {
$boundary = "---------------------------" .
base_convert(mt_rand(), 10, 36) .
base_convert(mt_rand(), 10, 36) .
base_convert(mt_rand(), 10, 36);
foreach ($postParts as $part) {
if (strpos($part, $boundary) !== false) {
# the boundary already occurs in this part, try a new boundary
continue 2;
}
}
# boundary occurs in no part, use it
return $boundary;
}
}
protected static buildPost($parts) {
$postParts[] = array();
foreach ($parts as $part) {
if (array_key_exists('filename')) {
# this is a file part
$postParts[] = self::buildFilePart($part);
}
else {
# this is a simple data part
$postParts[] = self::buildDataPart($part);
}
}
$boundary = self::buildBoundary($postParts);
$bd = '--' . $boundary . EOL;
$final_bd = '--' . $boundary . '--' . EOL;
return array($boundary, $bd . implode($bd, $postParts) . $final_bd);
}
public function post($url) {
list($boundary, $content) = buildPost($this->_parts);
$ctype = 'Content-Type: multipart/form-data; boundary="' . $boundary . '"';
$ctx = stream_context_create(array(
'http' => array(
'method' => 'POST',
'header' => $ctype,
'content' => $content
)
);
return file_get_contents($url, false, $ctx);
}
}
?>
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