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MultipartUtils.php
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MultipartUtils.php
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<?php
namespace Shellbox\Multipart;
/**
* Static utility functions for the multipart reader
*/
class MultipartUtils {
/**
* Extract the boundary from a Content-Type string. If the Content-Type is
* not multipart, returns false.
*
* This can be used to get a boundary when constructing a MultipartReader
* from a request.
*
* @param string $contentType
* @return bool|string
*/
public static function extractBoundary( $contentType ) {
if ( !preg_match( '!^multipart/[a-z]+ *; *(.*)$!i', $contentType, $m ) ) {
return false;
}
$params = self::decodeParameters( $m[1] );
return $params['boundary'] ?? false;
}
/**
* Decode semicolon-separated parameters into an associative array. The
* values may be quoted or unquoted. We try to follow the "parameter"
* production in RFC 1341.
*
* @param string $input
* @return array
* @throws MultipartError
*/
public static function decodeParameters( $input ) {
$params = [];
$parts = explode( ';', $input );
foreach ( $parts as $paramString ) {
$paramParts = explode( '=', $paramString, 2 );
$paramName = strtolower( trim( $paramParts[0] ) );
if ( count( $paramParts ) < 2 ) {
$paramValue = true;
} else {
$paramValue = self::decodeTokenOrQuotedString( $paramParts[1] );
}
$params[$paramName] = $paramValue;
}
return $params;
}
/**
* Parse the "value" production from RFC 1341, which is either an unquoted
* "token" or a quoted string with peculiar backslash escaping.
*
* @param string $input
* @return string
* @throws MultipartError
*/
public static function decodeTokenOrQuotedString( $input ) {
$input = trim( $input );
if ( $input === '' ) {
return '';
}
$tspecials = "()<>@,;:\\\"/[]?=";
$result = '';
if ( $input[0] === '"' ) {
$length = strlen( $input );
for ( $i = 1; $i < $length; $i++ ) {
$char = $input[$i];
if ( $char === '\\' && $i < $length - 1 ) {
$result .= $input[++$i];
} elseif ( $char === '"' ) {
if ( $i !== $length - 1 ) {
throw new MultipartError( "Invalid quoted string" );
}
break;
} else {
$result .= $char;
}
}
} else {
$length = strlen( $input );
for ( $i = 0; $i < $length; $i++ ) {
$char = $input[$i];
$ord = ord( $char );
if ( strpos( $tspecials, $char ) !== false
|| $char === ' ' || $char === "\x7f" || $ord < 32
) {
throw new MultipartError( "Invalid unquoted string" );
}
$result .= $char;
}
}
return $result;
}
}

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MultipartUtils.php (2 KB)

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