<?php
/**
* Helper class for building multipart/form-data request body
*
* PHP version 5
*
* LICENSE
*
* This source file is subject to BSD 3-Clause License that is bundled
* with this package in the file LICENSE and available at the URL
* https://raw.github.com/pear/HTTP_Request2/trunk/docs/LICENSE
*
* @category HTTP
* @package HTTP_Request2
* @author Alexey Borzov <avb@php.net>
* @copyright 2008-2014 Alexey Borzov <avb@php.net>
* @license http://opensource.org/licenses/BSD-3-Clause BSD 3-Clause License
* @link http://pear.php.net/package/HTTP_Request2
*/
/** Exception class for HTTP_Request2 package */
require_once 'HTTP/Request2/Exception.php';
/**
* Class for building multipart/form-data request body
*
* The class helps to reduce memory consumption by streaming large file uploads
* from disk, it also allows monitoring of upload progress (see request #7630)
*
* @category HTTP
* @package HTTP_Request2
* @author Alexey Borzov <avb@php.net>
* @license http://opensource.org/licenses/BSD-3-Clause BSD 3-Clause License
* @version Release: 2.2.1
* @link http://pear.php.net/package/HTTP_Request2
* @link http://tools.ietf.org/html/rfc1867
*/
class HTTP_Request2_MultipartBody
{
/**
* MIME boundary
* @var string
*/
private $_boundary;
/**
* Form parameters added via {@link HTTP_Request2::addPostParameter()}
* @var array
*/
private $_params = array();
/**
* File uploads added via {@link HTTP_Request2::addUpload()}
* @var array
*/
private $_uploads = array();
/**
* Header for parts with parameters
* @var string
*/
private $_headerParam = "--%s\r\nContent-Disposition: form-data; name=\"%s\"\r\n\r\n";
/**
* Header for parts with uploads
* @var string
*/
private $_headerUpload = "--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\nContent-Type: %s\r\n\r\n";
/**
* Current position in parameter and upload arrays
*
* First number is index of "current" part, second number is position within
* "current" part
*
* @var array
*/
private $_pos = array(0, 0);
/**
* Constructor. Sets the arrays with POST data.
*
* @param array $params values of form fields set via
* {@link HTTP_Request2::addPostParameter()}
* @param array $uploads file uploads set via
* {@link HTTP_Request2::addUpload()}
* @param bool $useBrackets whether to append brackets to array variable names
*/
public function __construct(array $params, array $uploads, $useBrackets = true)
{
$this->_params = self::_flattenArray('', $params, $useBrackets);
foreach ($uploads as $fieldName => $f) {
if (!is_array($f['fp'])) {
$this->_uploads[] = $f + array('name' => $fieldName);
} else {
for ($i = 0; $i < count($f['fp']); $i++) {
$upload = array(
'name' => ($useBrackets? $fieldName . '[' . $i . ']': $fieldName)
);
foreach (array('fp', 'filename', 'size', 'type') as $key) {
$upload[$key] = $f[$key][$i];
}
$this->_uploads[] = $upload;
}
}
}
}
/**
* Returns the length of the body to use in Content-Length header
*
* @return integer
*/
public function getLength()
{
$boundaryLength = strlen($this->getBoundary());
$headerParamLength = strlen($this->_headerParam) - 4 + $boundaryLength;
$headerUploadLength = strlen($this->_headerUpload) - 8 + $boundaryLength;
$length = $boundaryLength + 6;
foreach ($this->_params as $p) {
$length += $headerParamLength + strlen($p[0]) + strlen($p[1]) + 2;
}
foreach ($this->_uploads as $u) {
$length += $headerUploadLength + strlen($u['name']) + strlen($u['type']) +
strlen($u['filename']) + $u['size'] + 2;
}
return $length;
}
/**
* Returns the boundary to use in Content-Type header
*
* @return string
*/
public function getBoundary()
{
if (empty($this->_boundary)) {
$this->_boundary = '--' . md5('PEAR-HTTP_Request2-' . microtime());
}
return $this->_boundary;
}
/**
* Returns next chunk of request body
*
* @param integer $length Number of bytes to read
*
* @return string Up to $length bytes of data, empty string if at end
* @throws HTTP_Request2_LogicException
*/
public function read($length)
{
$ret = '';
$boundary = $this->getBoundary();
$paramCount = count($this->_params);
$uploadCount = count($this->_uploads);
while ($length > 0 && $this->_pos[0] <= $paramCount + $uploadCount) {
$oldLength = $length;
if ($this->_pos[0] < $paramCount) {
$param = sprintf(
$this->_headerParam, $boundary, $this->_params[$this->_pos[0]][0]
) . $this->_params[$this->_pos[0]][1] . "\r\n";
$ret .= substr($param, $this->_pos[1], $length);
$length -= min(strlen($param) - $this->_pos[1], $length);
} elseif ($this->_pos[0] < $paramCount + $uploadCount) {
$pos = $this->_pos[0] - $paramCount;
$header = sprintf(
$this->_headerUpload, $boundary, $this->_uploads[$pos]['name'],
$this->_uploads[$pos]['filename'], $this->_uploads[$pos]['type']
);
if ($this->_pos[1] < strlen($header)) {
$ret .= substr($header, $this->_pos[1], $length);
$length -= min(strlen($header) - $this->_pos[1], $length);
}
$filePos = max(0, $this->_pos[1] - strlen($header));
if ($filePos < $this->_uploads[$pos]['size']) {
while ($length > 0 && !feof($this->_uploads[$pos]['fp'])) {
if (false === ($chunk = fread($this->_uploads[$pos]['fp'], $length))) {
throw new HTTP_Request2_LogicException(
'Failed reading file upload', HTTP_Request2_Exception::READ_ERROR
);
}
$ret .= $chunk;
$length -= strlen($chunk);
}
}
if ($length > 0) {
$start = $this->_pos[1] + ($oldLength - $length) -
strlen($header) - $this->_uploads[$pos]['size'];
$ret .= substr("\r\n", $start, $length);
$length -= min(2 - $start, $length);
}
} else {
$closing = '--' . $boundary . "--\r\n";
$ret .= substr($closing, $this->_pos[1], $length);
$length -= min(strlen($closing) - $this->_pos[1], $length);
}
if ($length > 0) {
$this->_pos = array($this->_pos[0] + 1, 0);
} else {
$this->_pos[1] += $oldLength;
}
}
return $ret;
}
/**
* Sets the current position to the start of the body
*
* This allows reusing the same body in another request
*/
public function rewind()
{
$this->_pos = array(0, 0);
foreach ($this->_uploads as $u) {
rewind($u['fp']);
}
}
/**
* Returns the body as string
*
* Note that it reads all file uploads into memory so it is a good idea not
* to use this method with large file uploads and rely on read() instead.
*
* @return string
*/
public function __toString()
{
$this->rewind();
return $this->read($this->getLength());
}
/**
* Helper function to change the (probably multidimensional) associative array
* into the simple one.
*
* @param string $name name for item
* @param mixed $values item's values
* @param bool $useBrackets whether to append [] to array variables' names
*
* @return array array with the following items: array('item name', 'item value');
*/
private static function _flattenArray($name, $values, $useBrackets)
{
if (!is_array($values)) {
return array(array($name, $values));
} else {
$ret = array();
foreach ($values as $k => $v) {
if (empty($name)) {
$newName = $k;
} elseif ($useBrackets) {
$newName = $name . '[' . $k . ']';
} else {
$newName = $name;
}
$ret = array_merge($ret, self::_flattenArray($newName, $v, $useBrackets));
}
return $ret;
}
}
}
?>