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120 lines
2.7 KiB
PHP
120 lines
2.7 KiB
PHP
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<?php
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namespace App\Util\HttpSignatures;
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class Context
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{
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/** @var array */
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private $headers;
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/** @var KeyStoreInterface */
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private $keyStore;
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/** @var array */
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private $keys;
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/** @var string */
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private $signingKeyId;
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/** @var AlgorithmInterface */
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private $algorithm;
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/**
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* @param array $args
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*
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* @throws Exception
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*/
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public function __construct($args)
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{
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if (isset($args['keys']) && isset($args['keyStore'])) {
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throw new Exception(__CLASS__.' accepts keys or keyStore but not both');
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} elseif (isset($args['keys'])) {
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// array of keyId => keySecret
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$this->keys = $args['keys'];
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} elseif (isset($args['keyStore'])) {
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$this->setKeyStore($args['keyStore']);
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}
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// algorithm for signing; not necessary for verifying.
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if (isset($args['algorithm'])) {
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$this->algorithm = Algorithm::create($args['algorithm']);
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}
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// headers list for signing; not necessary for verifying.
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if (isset($args['headers'])) {
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$this->headers = $args['headers'];
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}
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// signingKeyId specifies the key used for signing messages.
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if (isset($args['signingKeyId'])) {
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$this->signingKeyId = $args['signingKeyId'];
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} elseif (isset($args['keys']) && 1 === count($args['keys'])) {
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list($this->signingKeyId) = array_keys($args['keys']); // first key
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}
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}
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/**
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* @return Signer
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*
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* @throws Exception
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*/
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public function signer()
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{
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return new Signer(
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$this->signingKey(),
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$this->algorithm,
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$this->headerList()
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);
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}
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/**
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* @return Verifier
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*/
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public function verifier()
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{
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return new Verifier($this->keyStore());
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}
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/**
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* @return Key
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*
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* @throws Exception
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* @throws KeyStoreException
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*/
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private function signingKey()
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{
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if (isset($this->signingKeyId)) {
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return $this->keyStore()->fetch($this->signingKeyId);
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} else {
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throw new Exception('no implicit or specified signing key');
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}
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}
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/**
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* @return HeaderList
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*/
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private function headerList()
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{
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return new HeaderList($this->headers);
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}
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/**
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* @return KeyStore
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*/
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private function keyStore()
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{
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if (empty($this->keyStore)) {
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$this->keyStore = new KeyStore($this->keys);
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}
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return $this->keyStore;
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}
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/**
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* @param KeyStoreInterface $keyStore
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*/
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private function setKeyStore(KeyStoreInterface $keyStore)
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{
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$this->keyStore = $keyStore;
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}
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}
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