chore: improve testing and override fetch url to use Guzzle (#21)

* chore: improve testing

* Update description of getRoute function

* Move descriptions to docblock

* Add additional test for nonce, state and code challenge

* Cleanup

* Override fetchUrl and add test for id token logic

* Generate JWT in test

* Run linter

* Improve test with signed id token

* Reformat headers

* Add additional request tests

* Add some description

* Use tls_verify config option for ca path

config/oidc.php

@@ -81,9 +81,13 @@
     ],
 
     /**
-     * TLS Verify
-     * Can be disabled for local development.
-     * Is used in OpenIDConfigurationLoader and in the ServiceProvider for OpenIDConnectClient.
+     * TLS Verify - Used as the verify option for Guzzle.
+     *
+     * Default is true and verifies the certificate and uses the default CA bundle of the system.
+     * When set to `false` it disables the certificate verification (this is insecure!).
+     * When set to a path of a CA bundle, the custom certificate is used.
+     *
+     * @link https://docs.guzzlephp.org/en/latest/request-options.html#verify
      */
     'tls_verify' => env('OIDC_TLS_VERIFY', true),
 ];

src/OpenIDConfiguration/OpenIDConfigurationLoader.php

@@ -13,7 +13,7 @@ public function __construct(
         protected string $issuer,
         protected ?Repository $cacheStore = null,
         protected int $cacheTtl = 3600,
-        protected bool $tlsVerify = true,
+        protected bool|string $tlsVerify = true,
     ) {
     }
 
@@ -39,9 +39,9 @@ protected function getConfigurationFromIssuer(): OpenIDConfiguration
         $url = $this->getOpenIDConfigurationUrl();
 
         $response = Http::baseUrl($this->issuer)
-            ->when(!$this->tlsVerify, function ($pendingRequest) {
-                return $pendingRequest->withoutVerifying();
-            })
+            ->withOptions([
+                'verify' => $this->tlsVerify
+            ])
             ->get($url);
 
         if (!$response->successful()) {

src/OpenIDConnectClient.php

@@ -6,6 +6,7 @@
 
 use Illuminate\Http\Exceptions\HttpResponseException;
 use Illuminate\Http\RedirectResponse;
+use Illuminate\Support\Facades\Http;
 use Illuminate\Support\Facades\Session;
 use Illuminate\Support\Str;
 use Jumbojett\OpenIDConnectClientException;
@@ -19,6 +20,15 @@ class OpenIDConnectClient extends \Jumbojett\OpenIDConnectClient
 {
     protected ?JweDecryptInterface $jweDecrypter;
     protected ?OpenIDConfiguration $openIDConfiguration;
+    /**
+     * @var int|null Response code from the server
+     */
+    protected ?int $responseCode;
+
+    /**
+     * @var string|null Content type from the server
+     */
+    private ?string $responseContentType;
 
     public function __construct(
         ?string $providerUrl = null,
@@ -95,7 +105,6 @@ protected function handleJweResponse($jwe): string
      * @param string|string[]|bool|null $default optional
      * @throws OpenIDConnectClientException
      * @return string|string[]|bool
-     * @psalm-suppress ImplementedReturnTypeMismatch
      */
     protected function getWellKnownConfigValue($param, $default = null): string|array|bool
     {
@@ -156,4 +165,97 @@ protected function getAuthorizationEndpoint(): string
 
         return $authorizationEndpoint;
     }
+
+    /**
+     * Override the fetchURL method to use Laravel HTTP client.
+     * This uses Guzzle in the background.
+     *
+     * @param string $url
+     * @param string | null $post_body string If this is set the post type will be POST
+     * @param array<array-key, mixed> $headers Extra headers to be sent with the request.
+     * @return string
+     * @throws OpenIDConnectClientException
+     */
+    protected function fetchURL(string $url, string $post_body = null, array $headers = []): string
+    {
+        $pendingRequest = Http::withUserAgent($this->getUserAgent())
+            ->timeout($this->timeOut)
+            ->withOptions([
+                'verify' => $this->getCertPath() ?: $this->getVerifyPeer()
+            ]);
+
+        if (count($headers) > 0) {
+            $pendingRequest->withHeaders($this->reformatHeaders($headers));
+        }
+
+        if ($post_body === null) {
+            $request = $pendingRequest->get($url);
+        } else {
+            $isJson = is_object(json_decode($post_body, false));
+
+            $request = $pendingRequest
+                ->withBody($post_body, $isJson ? 'application/json' : 'application/x-www-form-urlencoded')
+                ->post($url);
+        }
+
+        $this->responseCode = $request->status();
+        $this->responseContentType = $request->header('Content-Type');
+
+        if ($request->failed()) {
+            throw new OpenIDConnectClientException(
+                'Request failed with status code ' . $this->responseCode . ' ' . $request->reason()
+            );
+        }
+
+        return $request->body();
+    }
+
+    /**
+     * Get the response code from last action/curl request.
+     *
+     * @return int
+     */
+    public function getResponseCode(): int
+    {
+        return $this->responseCode ?? 0;
+    }
+
+    /**
+     * Get the content type from last action/curl request.
+     *
+     * @return string|null
+     */
+    public function getResponseContentType(): ?string
+    {
+        return $this->responseContentType;
+    }
+
+    public function setTlsVerify(bool|string $tlsVerify): void
+    {
+        $verify = (bool)$tlsVerify;
+        $this->setVerifyHost($verify);
+        $this->setVerifyPeer($verify);
+
+        if (is_string($tlsVerify)) {
+            $this->setCertPath($tlsVerify);
+        }
+    }
+
+    /**
+     * Reformat the headers from string to array for Guzzle.
+     *
+     * @param array<string> $headers
+     * @return array<string, array<int, string>>
+     */
+    protected function reformatHeaders(array $headers): array
+    {
+        $result = [];
+
+        foreach ($headers as $header) {
+            [$key, $value] = explode(": ", $header, 2);
+            $result[$key] = [$value];
+        }
+
+        return $result;
+    }
 }

src/OpenIDConnectServiceProvider.php

@@ -87,7 +87,7 @@ protected function registerConfigurationLoader(): void
                 $app['config']->get('oidc.issuer'),
                 $app['cache']->store($app['config']->get('oidc.configuration_cache.store')),
                 $app['config']->get('oidc.configuration_cache.ttl'),
-                $app['config']->get('oidc.tls_verify') === true,
+                $app['config']->get('oidc.tls_verify'),
             );
         });
     }
@@ -104,18 +104,17 @@ protected function registerClient(): void
             if (!empty($app['config']->get('oidc.client_secret'))) {
                 $oidc->setClientSecret($app['config']->get('oidc.client_secret'));
             }
-            $oidc->setCodeChallengeMethod($app['config']->get('oidc.code_challenge_method'));
+            if (!empty($app['config']->get('oidc.code_challenge_method'))) {
+                $oidc->setCodeChallengeMethod($app['config']->get('oidc.code_challenge_method'));
+            }
             $oidc->setRedirectURL($app['url']->route('oidc.login'));
 
             $additionalScopes = $app['config']->get('oidc.additional_scopes');
             if (is_array($additionalScopes) && count($additionalScopes) > 0) {
                 $oidc->addScope($additionalScopes);
             }
 
-            if ($app['config']->get('oidc.tls_verify') !== true) {
-                $oidc->setVerifyHost(false);
-                $oidc->setVerifyPeer(false);
-            }
+            $oidc->setTlsVerify($app['config']->get('oidc.tls_verify'));
             return $oidc;
         });
     }