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pixelfed/app/Util/HTTPSignatures/Context.php

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2018-11-19 03:33:10 +00:00
<?php
namespace App\Util\HttpSignatures;
class Context
{
/** @var array */
private $headers;
/** @var KeyStoreInterface */
private $keyStore;
/** @var array */
private $keys;
/** @var string */
private $signingKeyId;
/** @var AlgorithmInterface */
private $algorithm;
/**
* @param array $args
*
* @throws Exception
*/
public function __construct($args)
{
if (isset($args['keys']) && isset($args['keyStore'])) {
throw new Exception(__CLASS__.' accepts keys or keyStore but not both');
} elseif (isset($args['keys'])) {
// array of keyId => keySecret
$this->keys = $args['keys'];
} elseif (isset($args['keyStore'])) {
$this->setKeyStore($args['keyStore']);
}
// algorithm for signing; not necessary for verifying.
if (isset($args['algorithm'])) {
$this->algorithm = Algorithm::create($args['algorithm']);
}
// headers list for signing; not necessary for verifying.
if (isset($args['headers'])) {
$this->headers = $args['headers'];
}
// signingKeyId specifies the key used for signing messages.
if (isset($args['signingKeyId'])) {
$this->signingKeyId = $args['signingKeyId'];
} elseif (isset($args['keys']) && 1 === count($args['keys'])) {
list($this->signingKeyId) = array_keys($args['keys']); // first key
}
}
/**
* @return Signer
*
* @throws Exception
*/
public function signer()
{
return new Signer(
$this->signingKey(),
$this->algorithm,
$this->headerList()
);
}
/**
* @return Verifier
*/
public function verifier()
{
return new Verifier($this->keyStore());
}
/**
* @return Key
*
* @throws Exception
* @throws KeyStoreException
*/
private function signingKey()
{
if (isset($this->signingKeyId)) {
return $this->keyStore()->fetch($this->signingKeyId);
} else {
throw new Exception('no implicit or specified signing key');
}
}
/**
* @return HeaderList
*/
private function headerList()
{
return new HeaderList($this->headers);
}
/**
* @return KeyStore
*/
private function keyStore()
{
if (empty($this->keyStore)) {
$this->keyStore = new KeyStore($this->keys);
}
return $this->keyStore;
}
/**
* @param KeyStoreInterface $keyStore
*/
private function setKeyStore(KeyStoreInterface $keyStore)
{
$this->keyStore = $keyStore;
}
}