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