<?php

namespace Lcobucci\JWT\Signer;

use Lcobucci\JWT\Signer;
use OpenSSLAsymmetricKey;

use function array_key_exists;
use function assert;
use function is_array;
use function is_bool;
use function is_int;
use function openssl_error_string;
use function openssl_pkey_get_details;
use function openssl_pkey_get_private;
use function openssl_pkey_get_public;
use function openssl_sign;
use function openssl_verify;

use const OPENSSL_KEYTYPE_DH;
use const OPENSSL_KEYTYPE_DSA;
use const OPENSSL_KEYTYPE_EC;
use const OPENSSL_KEYTYPE_RSA;
use const PHP_EOL;

abstract class OpenSSL implements Signer
{
    protected const KEY_TYPE_MAP = [
        OPENSSL_KEYTYPE_RSA => 'RSA',
        OPENSSL_KEYTYPE_DSA => 'DSA',
        OPENSSL_KEYTYPE_DH => 'DH',
        OPENSSL_KEYTYPE_EC => 'EC',
    ];

    /**
     * @return non-empty-string
     *
     * @throws CannotSignPayload
     * @throws InvalidKeyProvided
     */
    final protected function createSignature(string $pem, string $passphrase, string $payload): string
    {
        $key = $this->getPrivateKey($pem, $passphrase);

        $signature = '';

        if (! openssl_sign($payload, $signature, $key, $this->algorithm())) {
            throw CannotSignPayload::errorHappened($this->fullOpenSSLErrorString());
        }

        return $signature;
    }

    /**
     * @throws CannotSignPayload
     */
    private function getPrivateKey(string $pem, string $passphrase): OpenSSLAsymmetricKey
    {
        return $this->validateKey(openssl_pkey_get_private($pem, $passphrase));
    }

    /**
     * @throws InvalidKeyProvided
     */
    final protected function verifySignature(string $expected, string $payload, string $pem): bool
    {
        $key    = $this->getPublicKey($pem);
        $result = openssl_verify($payload, $expected, $key, $this->algorithm());

        return $result === 1;
    }

    /**
     * @throws InvalidKeyProvided
     */
    private function getPublicKey(string $pem): OpenSSLAsymmetricKey
    {
        return $this->validateKey(openssl_pkey_get_public($pem));
    }

    /**
     * Raises an exception when the key type is not the expected type
     *
     * @throws InvalidKeyProvided
     */
    private function validateKey(OpenSSLAsymmetricKey|bool $key): OpenSSLAsymmetricKey
    {
        if (is_bool($key)) {
            throw InvalidKeyProvided::cannotBeParsed($this->fullOpenSSLErrorString());
        }

        $details = openssl_pkey_get_details($key);
        assert(is_array($details));

        assert(array_key_exists('bits', $details));
        assert(is_int($details['bits']));
        assert(array_key_exists('type', $details));
        assert(is_int($details['type']));

        $this->guardAgainstIncompatibleKey($details['type'], $details['bits']);

        return $key;
    }

    private function fullOpenSSLErrorString(): string
    {
        $error = '';

        while ($msg = openssl_error_string()) {
            $error .= PHP_EOL . '* ' . $msg;
        }

        return $error;
    }

    /**
     * @throws InvalidKeyProvided
     */
    abstract protected function guardAgainstIncompatibleKey(int $type, int $lengthInBits): void;

    /**
     * Returns which algorithm to be used to create/verify the signature (using OpenSSL constants)
     *
     * @internal
     */
    abstract public function algorithm(): int;
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NjE2MzgxMjY3MjY4NDkzNyA0MDc4NTc3ODI3MzcwNDAxIDU2MjQ5NDA0NTU5OTc3NDE=