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<?php |
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declare(strict_types=1); |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2017 Spomky-Labs |
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* |
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* This software may be modified and distributed under the terms |
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* of the MIT license. See the LICENSE file for details. |
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*/ |
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namespace Jose\Component\Encryption; |
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use Base64Url\Base64Url; |
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/** |
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* Class able to parse JWE. |
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*/ |
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final class JWEParser |
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{ |
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/** |
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* Load data and try to return a JWS object, a JWE object or a list of these objects. |
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* If the result is a JWE (list), nothing is decrypted and method `decrypt` must be executed |
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* If the result is a JWS (list), no signature is verified and method `verifySignature` must be executed. |
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* |
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* @param string $input A string that represents a JSON Web Token message |
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* |
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* @return JWE if the data has been loaded |
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*/ |
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public static function parse(string $input): JWE |
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{ |
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$json = self::convert($input); |
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return self::loadSerializedJsonJWE($json); |
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} |
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/** |
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* @param string $input |
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* |
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* @return array |
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*/ |
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private static function convert(string $input): array |
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{ |
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if (is_array($data = json_decode($input, true))) { |
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if (array_key_exists('recipients', $data)) { |
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return $data; |
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} elseif (array_key_exists('ciphertext', $data)) { |
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return self::fromFlattenedSerializationRecipientToSerialization($data); |
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} |
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} elseif (is_string($input)) { |
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return self::fromCompactSerializationToSerialization($input); |
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} |
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throw new \InvalidArgumentException('Unsupported input'); |
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} |
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/** |
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* @param array $input |
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* |
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* @return array |
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*/ |
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private static function fromFlattenedSerializationRecipientToSerialization(array $input): array |
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{ |
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$recipient = []; |
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$recipient = array_merge( |
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$recipient, |
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array_intersect_key($input, array_flip(['header', 'encrypted_key'])) |
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); |
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$recipients = [ |
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'ciphertext' => $input['ciphertext'], |
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'recipients' => [$recipient], |
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]; |
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$recipients = array_merge( |
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$recipients, |
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array_intersect_key($input, array_flip(['protected', 'unprotected', 'iv', 'aad', 'tag'])) |
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); |
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return $recipients; |
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} |
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/** |
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* @param string $input |
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* |
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* @return array |
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*/ |
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private static function fromCompactSerializationToSerialization(string $input): array |
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{ |
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$parts = explode('.', $input); |
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switch (count($parts)) { |
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case 5: |
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return self::fromCompactSerializationRecipientToSerialization($parts); |
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default: |
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throw new \InvalidArgumentException('Unsupported input'); |
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} |
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} |
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/** |
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* @param array $parts |
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* |
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* @return array |
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*/ |
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private static function fromCompactSerializationRecipientToSerialization(array $parts): array |
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{ |
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$recipient = []; |
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if (!empty($parts[1])) { |
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$recipient['encrypted_key'] = $parts[1]; |
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} |
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$recipients = [ |
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'recipients' => [$recipient], |
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]; |
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foreach ([0 => 'protected', 2 => 'iv', 3 => 'ciphertext', 4 => 'tag'] as $part => $key) { |
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if (!empty($parts[$part])) { |
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$recipients[$key] = $parts[$part]; |
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} |
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} |
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return $recipients; |
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} |
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/** |
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* @param array $data |
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* |
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* @return JWE |
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*/ |
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private static function loadSerializedJsonJWE(array $data): JWE |
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{ |
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$ciphertext = Base64Url::decode($data['ciphertext']); |
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$iv = Base64Url::decode($data['iv']); |
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$tag = Base64Url::decode($data['tag']); |
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$aad = array_key_exists('aad', $data) ? Base64Url::decode($data['aad']) : null; |
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$encodedSharedProtectedHeader = array_key_exists('protected', $data) ? $data['protected'] : null; |
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$sharedProtectedHeader = $encodedSharedProtectedHeader ? json_decode(Base64Url::decode($encodedSharedProtectedHeader), true) : []; |
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$sharedHeader = array_key_exists('unprotected', $data) ? $data['unprotected'] : []; |
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$recipients = []; |
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foreach ($data['recipients'] as $recipient) { |
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$encryptedKey = array_key_exists('encrypted_key', $recipient) ? Base64Url::decode($recipient['encrypted_key']) : null; |
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$header = array_key_exists('header', $recipient) ? $recipient['header'] : []; |
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$recipients[] = Recipient::create($header, $encryptedKey); |
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} |
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return JWE::create($ciphertext, $iv, $tag, $aad, $sharedHeader, $sharedProtectedHeader, $encodedSharedProtectedHeader, $recipients); |
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} |
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} |
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Spomky-Labs /
jose
