Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @copyright Copyright (C) 2010-2021, the Friendica project
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\Util;
/**
* Derived from the work of Reid Johnson <https://codereview.stackexchange.com/users/4020/reid-johnson>
* @see https://codereview.stackexchange.com/questions/69882/parsing-multipart-form-data-in-php-for-put-requests
*/
class HTTPInputData
{
public static function process()
{
$content_parts = explode(';', static::getContentType());
$boundary = '';
$encoding = '';
$content_type = array_shift($content_parts);
foreach ($content_parts as $part) {
if (strpos($part, 'boundary') !== false) {
$part = explode('=', $part, 2);
if (!empty($part[1])) {
$boundary = '--' . $part[1];
}
} elseif (strpos($part, 'charset') !== false) {
$part = explode('=', $part, 2);
if (!empty($part[1])) {
$encoding = $part[1];
}
}
if ($boundary !== '' && $encoding !== '') {
break;
}
}
if ($content_type == 'multipart/form-data') {
return self::fetchFromMultipart($boundary);
}
// can be handled by built in PHP functionality
$content = static::getPhpInputContent();
$variables = json_decode($content, true);
if (empty($variables)) {
parse_str($content, $variables);
}
return ['variables' => $variables, 'files' => []];
}
private static function fetchFromMultipart(string $boundary)
{
$result = ['variables' => [], 'files' => []];
$stream = static::getPhpInputStream();
$sanity = fgets($stream, strlen($boundary) + 5);
// malformed file, boundary should be first item
if (rtrim($sanity) !== $boundary) {
return $result;
}
$raw_headers = '';
while (($chunk = fgets($stream)) !== false) {
if ($chunk === $boundary) {
continue;
}
if (!empty(trim($chunk))) {
$raw_headers .= $chunk;
continue;
}
$result = self::parseRawHeader($stream, $raw_headers, $boundary, $result);
$raw_headers = '';
}
fclose($stream);
return $result;
}
private static function parseRawHeader($stream, string $raw_headers, string $boundary, array $result)
{
$variables = $result['variables'];
$files = $result['files'];
$headers = [];
foreach (explode("\r\n", $raw_headers) as $header) {
if (strpos($header, ':') === false) {
continue;
}
list($name, $value) = explode(':', $header, 2);
$headers[strtolower($name)] = ltrim($value, ' ');
}
if (!isset($headers['content-disposition'])) {
return ['variables' => $variables, 'files' => $files];
}
if (!preg_match('/^(.+); *name="([^"]+)"(; *filename="([^"]+)")?/', $headers['content-disposition'], $matches)) {
return ['variables' => $variables, 'files' => $files];
}
$name = $matches[2];
$filename = $matches[4] ?? '';
if (!empty($filename)) {
$files[$name] = self::fetchFileData($stream, $boundary, $headers, $filename);
return ['variables' => $variables, 'files' => $files];
} else {
$variables = self::fetchVariables($stream, $boundary, $headers, $name, $variables);
}
return ['variables' => $variables, 'files' => $files];
}
protected static function fetchFileData($stream, string $boundary, array $headers, string $filename)
{
$error = UPLOAD_ERR_OK;
if (isset($headers['content-type'])) {
$tmp = explode(';', $headers['content-type']);
$contentType = $tmp[0];
} else {
$contentType = 'unknown';
}
$tmpnam = tempnam(ini_get('upload_tmp_dir'), 'php');
$fileHandle = fopen($tmpnam, 'wb');
if ($fileHandle === false) {
$error = UPLOAD_ERR_CANT_WRITE;
} else {
$lastLine = null;
while (($chunk = fgets($stream, 8096)) !== false && strpos($chunk, $boundary) !== 0) {
if ($lastLine !== null) {
if (fwrite($fileHandle, $lastLine) === false) {
$error = UPLOAD_ERR_CANT_WRITE;
break;
}
}
$lastLine = $chunk;
}
if ($lastLine !== null && $error !== UPLOAD_ERR_CANT_WRITE) {
if (fwrite($fileHandle, rtrim($lastLine, "\r\n")) === false) {
$error = UPLOAD_ERR_CANT_WRITE;
}
}
}
return [
'name' => $filename,
'type' => $contentType,
'tmp_name' => $tmpnam,
'error' => $error,
'size' => filesize($tmpnam)
];
}
private static function fetchVariables($stream, string $boundary, array $headers, string $name, array $variables)
{
$fullValue = '';
$lastLine = null;
while (($chunk = fgets($stream)) !== false && strpos($chunk, $boundary) !== 0) {
if ($lastLine !== null) {
$fullValue .= $lastLine;
}
$lastLine = $chunk;
}
if ($lastLine !== null) {
$fullValue .= rtrim($lastLine, "\r\n");
}
if (isset($headers['content-type'])) {
$encoding = '';
foreach (explode(';', $headers['content-type']) as $part) {
if (strpos($part, 'charset') !== false) {
$part = explode($part, '=', 2);
if (isset($part[1])) {
$encoding = $part[1];
}
break;
}
}
if ($encoding !== '' && strtoupper($encoding) !== 'UTF-8' && strtoupper($encoding) !== 'UTF8') {
$tmp = mb_convert_encoding($fullValue, 'UTF-8', $encoding);
if ($tmp !== false) {
$fullValue = $tmp;
}
}
}
$fullValue = $name . '=' . $fullValue;
$tmp = [];
parse_str($fullValue, $tmp);
return self::expandVariables(explode('[', $name), $variables, $tmp);
}
private static function expandVariables(array $names, $variables, array $values)
{
if (!is_array($variables)) {
return $values;
}
$name = rtrim(array_shift($names), ']');
if ($name !== '') {
$name = $name . '=p';
$tmp = [];
parse_str($name, $tmp);
$tmp = array_keys($tmp);
$name = reset($tmp);
}
if ($name === '') {
$variables[] = reset($values);
} elseif (isset($variables[$name]) && isset($values[$name])) {
$variables[$name] = self::expandVariables($names, $variables[$name], $values[$name]);
} elseif (isset($values[$name])) {
$variables[$name] = $values[$name];
}
return $variables;
}
/**
* Returns the current PHP input stream
* Mainly used for test doubling
*
* @return false|resource
*/
protected static function getPhpInputStream()
{
return fopen('php://input', 'rb');
}
/**
* Returns the content of the current PHP input
* Mainly used for test doubling
*
* @return false|string
*/
protected static function getPhpInputContent()
{
return file_get_contents('php://input');
}
/**
* Returns the content type string of the current call
* Mainly used for test doubling
*
* @return false|string
*/
protected static function getContentType()
{
return $_SERVER['CONTENT_TYPE'] ?? 'application/x-www-form-urlencoded';
}
}