primo commit

libraries/vendor/web-token/jwt-library/Encryption/Serializer/JSONGeneralSerializer.php

@@ -0,0 +1,124 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Jose\Component\Encryption\Serializer;
+
+use InvalidArgumentException;
+use Jose\Component\Core\Util\Base64UrlSafe;
+use Jose\Component\Core\Util\JsonConverter;
+use Jose\Component\Encryption\JWE;
+use Jose\Component\Encryption\Recipient;
+use LogicException;
+use function array_key_exists;
+use function count;
+use function is_array;
+
+final class JSONGeneralSerializer implements JWESerializer
+{
+    public const NAME = 'jwe_json_general';
+
+    public function displayName(): string
+    {
+        return 'JWE JSON General';
+    }
+
+    public function name(): string
+    {
+        return self::NAME;
+    }
+
+    public function serialize(JWE $jwe, ?int $recipientIndex = null): string
+    {
+        if ($jwe->countRecipients() === 0) {
+            throw new LogicException('No recipient.');
+        }
+
+        $data = [
+            'ciphertext' => Base64UrlSafe::encodeUnpadded($jwe->getCiphertext() ?? ''),
+            'iv' => Base64UrlSafe::encodeUnpadded($jwe->getIV() ?? ''),
+            'tag' => Base64UrlSafe::encodeUnpadded($jwe->getTag() ?? ''),
+        ];
+        if ($jwe->getAAD() !== null) {
+            $data['aad'] = Base64UrlSafe::encodeUnpadded($jwe->getAAD());
+        }
+        if (count($jwe->getSharedProtectedHeader()) !== 0) {
+            $data['protected'] = $jwe->getEncodedSharedProtectedHeader();
+        }
+        if (count($jwe->getSharedHeader()) !== 0) {
+            $data['unprotected'] = $jwe->getSharedHeader();
+        }
+        $data['recipients'] = [];
+        foreach ($jwe->getRecipients() as $recipient) {
+            $temp = [];
+            if (count($recipient->getHeader()) !== 0) {
+                $temp['header'] = $recipient->getHeader();
+            }
+            if ($recipient->getEncryptedKey() !== null) {
+                $temp['encrypted_key'] = Base64UrlSafe::encodeUnpadded($recipient->getEncryptedKey());
+            }
+            $data['recipients'][] = $temp;
+        }
+
+        return JsonConverter::encode($data);
+    }
+
+    public function unserialize(string $input): JWE
+    {
+        $data = JsonConverter::decode($input);
+        if (! is_array($data)) {
+            throw new InvalidArgumentException('Unsupported input.');
+        }
+        $this->checkData($data);
+
+        $ciphertext = Base64UrlSafe::decodeNoPadding($data['ciphertext']);
+        $iv = Base64UrlSafe::decodeNoPadding($data['iv']);
+        $tag = Base64UrlSafe::decodeNoPadding($data['tag']);
+        $aad = array_key_exists('aad', $data) ? Base64UrlSafe::decodeNoPadding($data['aad']) : null;
+        [$encodedSharedProtectedHeader, $sharedProtectedHeader, $sharedHeader] = $this->processHeaders($data);
+        $recipients = [];
+        foreach ($data['recipients'] as $recipient) {
+            [$encryptedKey, $header] = $this->processRecipient($recipient);
+            $recipients[] = new Recipient($header, $encryptedKey);
+        }
+
+        return new JWE(
+            $ciphertext,
+            $iv,
+            $tag,
+            $aad,
+            $sharedHeader,
+            $sharedProtectedHeader,
+            $encodedSharedProtectedHeader,
+            $recipients
+        );
+    }
+
+    private function checkData(?array $data): void
+    {
+        if ($data === null || ! isset($data['ciphertext']) || ! isset($data['recipients'])) {
+            throw new InvalidArgumentException('Unsupported input.');
+        }
+    }
+
+    private function processRecipient(array $recipient): array
+    {
+        $encryptedKey = array_key_exists('encrypted_key', $recipient) ? Base64UrlSafe::decodeNoPadding(
+            $recipient['encrypted_key']
+        ) : null;
+        $header = array_key_exists('header', $recipient) ? $recipient['header'] : [];
+
+        return [$encryptedKey, $header];
+    }
+
+    private function processHeaders(array $data): array
+    {
+        $encodedSharedProtectedHeader = array_key_exists('protected', $data) ? $data['protected'] : null;
+        $sharedProtectedHeader = $encodedSharedProtectedHeader ? JsonConverter::decode(
+            Base64UrlSafe::decodeNoPadding($encodedSharedProtectedHeader)
+        ) : [];
+        $sharedHeader = array_key_exists('unprotected', $data) ? $data['unprotected'] : [];
+
+        return [$encodedSharedProtectedHeader, $sharedProtectedHeader, $sharedHeader];
+    }
+}