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<?php

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declare (strict_types=1);

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namespace YoastSEO_Vendor\GuzzleHttp\Psr7;

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final class Header

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{

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/**

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* Parse an array of header values containing ";" separated data into an

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* array of associative arrays representing the header key value pair data

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* of the header. When a parameter does not contain a value, but just

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* contains a key, this function will inject a key with a '' string value.

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* @param string|array $header Header to parse into components.

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public static function parse($header) : array

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{

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static $trimmed = "\"' \n\t\r";

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$params = $matches = [];

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foreach ((array) $header as $value) {

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foreach (self::splitList($value) as $val) {

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$part = [];

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foreach (\preg_split('/;(?=([^"]*"[^"]*")*[^"]*$)/', $val) ?: [] as $kvp) {

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if (\preg_match_all('/<[^>]+>|[^=]+/', $kvp, $matches)) {

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$m = $matches[0];

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if (isset($m[1])) {

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$part[\trim($m[0], $trimmed)] = \trim($m[1], $trimmed);

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} else {

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$part[] = \trim($m[0], $trimmed);

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}

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}

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}

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if ($part) {

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$params[] = $part;

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}

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}

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}

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return $params;

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}

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/**

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* Converts an array of header values that may contain comma separated

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* headers into an array of headers with no comma separated values.

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* @param string|array $header Header to normalize.

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* @deprecated Use self::splitList() instead.

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public static function normalize($header) : array

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{

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$result = [];

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foreach ((array) $header as $value) {

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foreach (self::splitList($value) as $parsed) {

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$result[] = $parsed;

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}

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}

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return $result;

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}

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/**

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* Splits a HTTP header defined to contain a comma-separated list into

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* each individual value. Empty values will be removed.

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* Example headers include 'accept', 'cache-control' and 'if-none-match'.

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* This method must not be used to parse headers that are not defined as

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* a list, such as 'user-agent' or 'set-cookie'.

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* @param string|string[] $values Header value as returned by MessageInterface::getHeader()

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* @return string[]

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public static function splitList($values) : array

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{

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if (!\is_array($values)) {

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$values = [$values];

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}

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$result = [];

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foreach ($values as $value) {

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if (!\is_string($value)) {

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throw new \TypeError('$header must either be a string or an array containing strings.');

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}

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$v = '';

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$isQuoted = \false;

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$isEscaped = \false;

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for ($i = 0, $max = \strlen($value); $i < $max; ++$i) {

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if ($isEscaped) {

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$v .= $value[$i];

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$isEscaped = \false;

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continue;

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}

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if (!$isQuoted && $value[$i] === ',') {

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$v = \trim($v);

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if ($v !== '') {

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$result[] = $v;

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}

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$v = '';

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continue;

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}

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if ($isQuoted && $value[$i] === '\\') {

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$isEscaped = \true;

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$v .= $value[$i];

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continue;

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}

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if ($value[$i] === '"') {

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$isQuoted = !$isQuoted;

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$v .= $value[$i];

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continue;

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}

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$v .= $value[$i];

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}

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$v = \trim($v);

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if ($v !== '') {

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$result[] = $v;

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}

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}

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return $result;

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}

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}

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