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pixelfed/app/Util/HTTPSignatures/SignatureParametersParser.php

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PHP
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2018-11-19 03:33:10 +00:00
<?php
namespace App\Util\HttpSignatures;
class SignatureParametersParser
{
/** @var string */
private $input;
/**
* @param string $input
*/
public function __construct($input)
{
$this->input = $input;
}
/**
* @return array
*/
public function parse()
{
$result = $this->pairsToAssociative(
$this->arrayOfPairs()
);
$this->validate($result);
return $result;
}
/**
* @param array $pairs
*
* @return array
*/
private function pairsToAssociative($pairs)
{
$result = [];
foreach ($pairs as $pair) {
$result[$pair[0]] = $pair[1];
}
return $result;
}
/**
* @return array
*/
private function arrayOfPairs()
{
return array_map(
[$this, 'pair'],
$this->segments()
);
}
/**
* @return array
*/
private function segments()
{
return explode(',', $this->input);
}
/**
* @param $segment
*
* @return array
*
* @throws SignatureParseException
*/
private function pair($segment)
{
$segmentPattern = '/\A(keyId|algorithm|headers|signature)="(.*)"\z/';
$matches = [];
$result = preg_match($segmentPattern, $segment, $matches);
if (1 !== $result) {
throw new SignatureParseException("Signature parameters segment '$segment' invalid");
}
array_shift($matches);
return $matches;
}
/**
* @param $result
*
* @throws SignatureParseException
*/
private function validate($result)
{
$this->validateAllKeysArePresent($result);
}
/**
* @param $result
*
* @throws SignatureParseException
*/
private function validateAllKeysArePresent($result)
{
// Regexp in pair() ensures no unwanted keys exist.
// Ensure that all wanted keys exist.
$wanted = ['keyId', 'algorithm', 'headers', 'signature'];
$missing = array_diff($wanted, array_keys($result));
if (!empty($missing)) {
$csv = implode(', ', $missing);
throw new SignatureParseException("Missing keys $csv");
}
}
}