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<?php
/**
* Utility for parsing a HTTP Accept header value into a weight map. May also be used with
* other, similar headers like Accept-Language, Accept-Encoding, etc.
*
* @license GPL-2.0-or-later
* @author Daniel Kinzler
*/
namespace Wikimedia\Http;
class HttpAcceptParser {
/**
* Parse media types from an Accept header and sort them by q-factor.
*
* Note that his was mostly ported from,
* https://github.com/arlolra/negotiator/blob/full-parse-access/lib/mediaType.js
*
* @param string $accept
* @return array[]
* - type: (string)
* - subtype: (string)
* - q: (float) q-factor weighting
* - i: (int) index
* - params: (array)
*/
public function parseAccept( $accept ): array {
$accepts = explode( ',', $accept ); // FIXME: Allow commas in quotes
$ret = [];
foreach ( $accepts as $i => $a ) {
if ( !preg_match( '!^([^\s/;]+)/([^;\s]+)\s*(?:;(.*))?$!D', trim( $a ), $matches ) ) {
continue;
}
$q = 1;
$params = [];
if ( isset( $matches[3] ) ) {
$kvps = explode( ';', $matches[3] ); // FIXME: Allow semi-colon in quotes
foreach ( $kvps as $kv ) {
[ $key, $val ] = explode( '=', trim( $kv ), 2 );
$key = strtolower( trim( $key ) );
$val = trim( $val );
if ( $key === 'q' ) {
$q = (float)$val; // FIXME: Spec is stricter about this
} else {
if ( $val && $val[0] === '"' && $val[ strlen( $val ) - 1 ] === '"' ) {
$val = substr( $val, 1, strlen( $val ) - 2 );
}
$params[$key] = $val;
}
}
}
$ret[] = [
'type' => $matches[1],
'subtype' => $matches[2],
'q' => $q,
'i' => $i,
'params' => $params,
];
}
// Sort list. First by q values, then by order
usort( $ret, static function ( $a, $b ) {
if ( $b['q'] > $a['q'] ) {
return 1;
} elseif ( $b['q'] === $a['q'] ) {
return $a['i'] - $b['i'];
} else {
return -1;
}
} );
return $ret;
}
/**
* Parses an HTTP header into a weight map, that is an associative array
* mapping values to their respective weights. Any header name preceding
* weight spec is ignored for convenience.
*
* Note that type parameters and accept extension like the "level" parameter
* are not supported, weights are derived from "q" values only.
*
* See RFC 7231 section 5.3.2 for details.
*
* @param string $rawHeader
*
* @return array
*/
public function parseWeights( $rawHeader ) {
// first, strip header name
$rawHeader = preg_replace( '/^[-\w]+:\s*/', '', $rawHeader );
// Return values in lower case
$rawHeader = strtolower( $rawHeader );
$accepts = $this->parseAccept( $rawHeader );
// Create a list like "en" => 0.8
return array_reduce( $accepts, static function ( $prev, $next ) {
$type = "{$next['type']}/{$next['subtype']}";
$prev[$type] = $next['q'];
return $prev;
}, [] );
}
}
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