117 lines
3.2 KiB
PHP
117 lines
3.2 KiB
PHP
<?php
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namespace App\Http\Middleware;
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use Closure;
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use Illuminate\Http\Request;
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class JwtAuthMiddleware
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{
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public function handle(Request $request, Closure $next)
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{
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try {
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$authHeader = $request->header('Authorization');
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if (!$authHeader) {
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return response()->json(['message' => 'Missing Authorization header'], 401);
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}
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if (!preg_match('/Bearer\s(\S+)/', $authHeader, $matches)) {
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return response()->json(['message' => 'Invalid token format'], 401);
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}
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$token = $matches[1];
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[$header, $payload, $signature] = $this->decodeToken($token);
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if (($header['alg'] ?? null) !== 'RS256') {
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return response()->json(['message' => 'Invalid token algorithm'], 401);
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}
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if (
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!$this->signatureIsValid($token, $signature) ||
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($payload['iss'] ?? null) !== config('jwt.issuer') ||
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($payload['aud'] ?? null) !== config('jwt.audience') ||
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empty($payload['sub']) ||
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$this->tokenIsExpired($payload)
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) {
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return response()->json(['message' => 'Invalid token'], 401);
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}
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$request->attributes->set('auth', [
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'id' => $payload['sub'],
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'token' => $token
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]);
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return $next($request);
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} catch (\Exception $e) {
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return response()->json(['message' => 'Invalid or expired token'], 401);
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}
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}
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private function decodeToken(string $token): array
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{
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$parts = explode('.', $token);
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if (count($parts) !== 3) {
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throw new \InvalidArgumentException('Invalid token structure');
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}
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return [
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$this->base64UrlDecodeJson($parts[0]),
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$this->base64UrlDecodeJson($parts[1]),
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$this->base64UrlDecode($parts[2]),
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];
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}
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private function base64UrlDecodeJson(string $value): array
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{
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$decoded = json_decode($this->base64UrlDecode($value), true);
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if (!is_array($decoded)) {
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throw new \InvalidArgumentException('Invalid token payload');
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}
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return $decoded;
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}
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private function base64UrlDecode(string $value): string
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{
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$value .= str_repeat('=', (4 - strlen($value) % 4) % 4);
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$decoded = base64_decode(strtr($value, '-_', '+/'), true);
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if ($decoded === false) {
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throw new \InvalidArgumentException('Invalid base64url value');
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}
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return $decoded;
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}
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private function signatureIsValid(string $token, string $signature): bool
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{
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[$header, $payload] = explode('.', $token, 3);
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$publicKey = str_replace('\\n', "\n", (string) config('jwt.public_key'));
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if ($publicKey === '') {
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return false;
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}
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return openssl_verify(
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$header . '.' . $payload,
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$signature,
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$publicKey,
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OPENSSL_ALGO_SHA256
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) === 1;
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}
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private function tokenIsExpired(array $payload): bool
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{
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if (!isset($payload['exp']) || !is_numeric($payload['exp'])) {
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return true;
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}
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return time() >= (int) $payload['exp'];
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}
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}
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