feat!: allow firebase/php-jwt v6

composer.json

@@ -10,7 +10,7 @@
   },
   "require": {
     "php": "^7.1||^8.0",
-    "firebase/php-jwt": "~5.0",
+    "firebase/php-jwt": "^5.5||^6.0",
     "guzzlehttp/guzzle": "^6.2.1|^7.0",
     "guzzlehttp/psr7": "^1.7|^2.0",
     "psr/http-message": "^1.0",

src/OAuth2.php

@@ -18,6 +18,7 @@
 namespace Google\Auth;
 
 use Firebase\JWT\JWT;
+use Firebase\JWT\Key;
 use Google\Auth\HttpHandler\HttpClientCache;
 use Google\Auth\HttpHandler\HttpHandlerFactory;
 use GuzzleHttp\Psr7\Query;
@@ -380,17 +381,18 @@ public function __construct(array $config)
      * - otherwise returns the payload in the idtoken as a PHP object.
      *
      * The behavior of this method varies depending on the version of
-     * `firebase/php-jwt` you are using. In versions lower than 3.0.0, if
-     * `$publicKey` is null, the key is decoded without being verified. In
-     * newer versions, if a public key is not given, this method will throw an
-     * `\InvalidArgumentException`.
+     * `firebase/php-jwt` you are using. In versions 6.0 and above, you cannot
+     * provide multiple $allowed_algs, and instead must provide an array of Key
+     * objects as the $publicKey.
      *
-     * @param string $publicKey The public key to use to authenticate the token
-     * @param array<string> $allowed_algs List of supported verification algorithms
+     * @param string|Key|Key[] $publicKey The public key to use to authenticate the token
+     * @param string|array<string> $allowed_algs algorithm or array of supported verification algorithms.
+     *        Providing more than one algorithm will throw an exception.
      * @throws \DomainException if the token is missing an audience.
      * @throws \DomainException if the audience does not match the one set in
      *         the OAuth2 class instance.
      * @throws \UnexpectedValueException If the token is invalid
+     * @throws \InvalidArgumentException If more than one value for allowed_algs is supplied
      * @throws \Firebase\JWT\SignatureInvalidException If the signature is invalid.
      * @throws \Firebase\JWT\BeforeValidException If the token is not yet valid.
      * @throws \Firebase\JWT\ExpiredException If the token has expired.
@@ -461,7 +463,7 @@ public function toJwt(array $config = [])
         }
         $assertion += $this->getAdditionalClaims();
 
-        return $this->jwtEncode(
+        return JWT::encode(
             $assertion,
             $this->getSigningKey(),
             $this->getSigningAlgorithm(),
@@ -1441,30 +1443,86 @@ private function coerceUri($uri)
 
     /**
      * @param string $idToken
-     * @param string|array<string>|null $publicKey
-     * @param array<string> $allowedAlgs
+     * @param Key|Key[]|string|string[] $publicKey
+     * @param string|string[] $allowedAlgs
      * @return object
      */
     private function jwtDecode($idToken, $publicKey, $allowedAlgs)
     {
-        return JWT::decode($idToken, $publicKey, $allowedAlgs);
+        $keys = $this->getFirebaseJwtKeys($publicKey, $allowedAlgs);
+
+        // Default exception if none are caught. We are using the same exception
+        // class and message from firebase/php-jwt to preserve backwards
+        // compatibility.
+        $e = new \InvalidArgumentException('Key may not be empty');
+        foreach ($keys as $key) {
+            try {
+                return JWT::decode($idToken, $key);
+            } catch (\Exception $e) {
+                // try next alg
+            }
+        }
+        throw $e;
     }
 
     /**
-     * @param array<mixed> $assertion
-     * @param string $signingKey
-     * @param string $signingAlgorithm
-     * @param string $signingKeyId
-     * @return string
+     * @param Key|Key[]|string|string[] $publicKey
+     * @param string|string[] $allowedAlgs
+     * @return Key[]
      */
-    private function jwtEncode($assertion, $signingKey, $signingAlgorithm, $signingKeyId = null)
+    private function getFirebaseJwtKeys($publicKey, $allowedAlgs)
     {
-        return JWT::encode(
-            $assertion,
-            $signingKey,
-            $signingAlgorithm,
-            $signingKeyId
-        );
+        // If $publicKey is instance of Key, return it
+        if ($publicKey instanceof Key) {
+            return [$publicKey];
+        }
+
+        // If $allowedAlgs is empty, $publicKey must be Key or Key[].
+        if (empty($allowedAlgs)) {
+            $keys = [];
+            foreach ((array) $publicKey as $kid => $pubKey) {
+                if (!$pubKey instanceof Key) {
+                    throw new \InvalidArgumentException(sprintf(
+                        'When allowed algorithms is empty, the public key must'
+                        . 'be an instance of %s or an array of %s objects',
+                        Key::class,
+                        Key::class
+                    ));
+                }
+                $keys[$kid] = $pubKey;
+            }
+            return $keys;
+        }
+
+        $allowedAlg = null;
+        if (is_string($allowedAlgs)) {
+            $allowedAlg = $allowedAlg;
+        } elseif (is_array($allowedAlgs)) {
+            if (count($allowedAlgs) > 1) {
+                throw new \InvalidArgumentException(
+                    'To have multiple allowed algorithms, You must provide an'
+                    . ' array of Firebase\JWT\Key objects.'
+                    . ' See https://github.com/firebase/php-jwt for more information.');
+            }
+            $allowedAlg = array_pop($allowedAlgs);
+        } else {
+            throw new \InvalidArgumentException('allowed algorithms must be a string or array.');
+        }
+
+        if (is_array($publicKey)) {
+            // When publicKey is greater than 1, create keys with the single alg.
+            $keys = [];
+            foreach ($publicKey as $kid => $pubKey) {
+                if ($pubKey instanceof Key) {
+                    $keys[$kid] = $pubKey;
+                } else {
+                    $keys[$kid] = new Key($pubKey, $allowedAlg);
+                }
+            }
+            return $keys;
+        }
+
+        return [new Key($publicKey, $allowedAlg)];
     }
 
     /**

tests/Credentials/ServiceAccountCredentialsTest.php

@@ -19,6 +19,7 @@
 
 use DomainException;
 use Firebase\JWT\JWT;
+use Firebase\JWT\Key;
 use Google\Auth\ApplicationDefaultCredentials;
 use Google\Auth\Credentials\ServiceAccountCredentials;
 use Google\Auth\Credentials\ServiceAccountJwtAccessCredentials;
@@ -799,8 +800,7 @@ public function testJwtAccessFromApplicationDefault()
         $this->assertArrayHasKey('authorization', $metadata);
         $token = str_replace('Bearer ', '', $metadata['authorization'][0]);
         $key = file_get_contents(__DIR__ . '/../fixtures3/key.pub');
-
-        $result = JWT::decode($token, $key, ['RS256']);
+        $result = JWT::decode($token, new Key($key, 'RS256'));
 
         $this->assertEquals($authUri, $result->aud);
     }

tests/OAuth2Test.php

@@ -19,6 +19,7 @@
 
 use DomainException;
 use Firebase\JWT\JWT;
+use Firebase\JWT\Key;
 use Google\Auth\OAuth2;
 use GuzzleHttp\Psr7\Query;
 use GuzzleHttp\Psr7\Utils;
@@ -442,15 +443,15 @@ public function testFailsWithMissingSigningAlgorithm()
     public function testCanHS256EncodeAValidPayloadWithSigningKeyId()
     {
         $testConfig = $this->signingMinimal;
-        $keys = array(
-            'example_key_id1' => 'example_key1',
-            'example_key_id2' => 'example_key2'
-        );
-        $testConfig['signingKey'] = $keys['example_key_id2'];
+        $keys = [
+            'example_key_id1' => new Key('example_key1', 'HS256'),
+            'example_key_id2' => new Key('example_key2', 'HS256'),
+        ];
+        $testConfig['signingKey'] = $keys['example_key_id2']->getKeyMaterial();
         $testConfig['signingKeyId'] = 'example_key_id2';
         $o = new OAuth2($testConfig);
         $payload = $o->toJwt();
-        $roundTrip = JWT::decode($payload, $keys, array('HS256'));
+        $roundTrip = JWT::decode($payload, $keys);
         $this->assertEquals($roundTrip->iss, $testConfig['issuer']);
         $this->assertEquals($roundTrip->aud, $testConfig['audience']);
         $this->assertEquals($roundTrip->scope, $testConfig['scope']);
@@ -459,16 +460,16 @@ public function testCanHS256EncodeAValidPayloadWithSigningKeyId()
     public function testFailDecodeWithoutSigningKeyId()
     {
         $testConfig = $this->signingMinimal;
-        $keys = array(
-            'example_key_id1' => 'example_key1',
-            'example_key_id2' => 'example_key2'
-        );
-        $testConfig['signingKey'] = $keys['example_key_id2'];
+        $keys = [
+            'example_key_id1' => new Key('example_key1', 'HS256'),
+            'example_key_id2' => new Key('example_key2', 'HS256'),
+        ];
+        $testConfig['signingKey'] = $keys['example_key_id2']->getKeyMaterial();
         $o = new OAuth2($testConfig);
         $payload = $o->toJwt();
 
         try {
-            JWT::decode($payload, $keys, array('HS256'));
+            JWT::decode($payload, $keys);
         } catch (\Exception $e) {
             // Workaround: In old JWT versions throws DomainException
             $this->assertTrue(
@@ -485,7 +486,7 @@ public function testCanHS256EncodeAValidPayload()
         $testConfig = $this->signingMinimal;
         $o = new OAuth2($testConfig);
         $payload = $o->toJwt();
-        $roundTrip = JWT::decode($payload, $testConfig['signingKey'], array('HS256'));
+        $roundTrip = JWT::decode($payload, new Key($testConfig['signingKey'], 'HS256'));
         $this->assertEquals($roundTrip->iss, $testConfig['issuer']);
         $this->assertEquals($roundTrip->aud, $testConfig['audience']);
         $this->assertEquals($roundTrip->scope, $testConfig['scope']);
@@ -500,7 +501,7 @@ public function testCanRS256EncodeAValidPayload()
         $o->setSigningAlgorithm('RS256');
         $o->setSigningKey($privateKey);
         $payload = $o->toJwt();
-        $roundTrip = JWT::decode($payload, $publicKey, array('RS256'));
+        $roundTrip = JWT::decode($payload, new Key($publicKey, 'RS256'));
         $this->assertEquals($roundTrip->iss, $testConfig['issuer']);
         $this->assertEquals($roundTrip->aud, $testConfig['audience']);
         $this->assertEquals($roundTrip->scope, $testConfig['scope']);
@@ -517,7 +518,7 @@ public function testCanHaveAdditionalClaims()
         $o->setSigningAlgorithm('RS256');
         $o->setSigningKey($privateKey);
         $payload = $o->toJwt();
-        $roundTrip = JWT::decode($payload, $publicKey, array('RS256'));
+        $roundTrip = JWT::decode($payload, new Key($publicKey, 'RS256'));
         $this->assertEquals($roundTrip->target_audience, $targetAud);
     }
 }
@@ -907,7 +908,7 @@ public function testFailsIfIdTokenIsInvalid()
         $not_a_jwt = 'not a jot';
         $o = new OAuth2($testConfig);
         $o->setIdToken($not_a_jwt);
-        $o->verifyIdToken($this->publicKey);
+        $o->verifyIdToken($this->publicKey, ['RS256']);
     }
 
     public function testFailsIfAudienceIsMissing()
@@ -943,6 +944,57 @@ public function testFailsIfAudienceIsWrong()
         $o->verifyIdToken($this->publicKey, ['RS256']);
     }
 
+    public function testFailsWithStringPublicKeyAndAllowedAlgsGreaterThanOne()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('To have multiple allowed algorithms');
+
+        $testConfig = $this->verifyIdTokenMinimal;
+        $not_a_jwt = 'not a jot';
+        $o = new OAuth2($testConfig);
+        $o->setIdToken($not_a_jwt);
+        $o->verifyIdToken($this->publicKey, ['RS256', 'ES256']);
+    }
+
+    public function testFailsWithStringPublicKeyAndNoAllowedAlgs()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('When allowed algorithms is empty');
+
+        $testConfig = $this->verifyIdTokenMinimal;
+        $not_a_jwt = 'not a jot';
+        $o = new OAuth2($testConfig);
+        $o->setIdToken($not_a_jwt);
+        $o->verifyIdToken($this->publicKey, []);
+    }
+
+    public function testFailsWithStringInPublicKeyArrayAndNoAllowedAlgs()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('When allowed algorithms is empty');
+
+        $testConfig = $this->verifyIdTokenMinimal;
+        $not_a_jwt = 'not a jot';
+        $o = new OAuth2($testConfig);
+        $o->setIdToken($not_a_jwt);
+        $o->verifyIdToken([
+            new Key($this->publicKey, 'RS256'),
+            $this->publicKey,
+        ], []);
+    }
+
+    public function testFailsWithInvalidTypeForAllowedAlgs()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('allowed algorithms must be a string or array');
+
+        $testConfig = $this->verifyIdTokenMinimal;
+        $not_a_jwt = 'not a jot';
+        $o = new OAuth2($testConfig);
+        $o->setIdToken($not_a_jwt);
+        $o->verifyIdToken($this->publicKey, 123);
+    }
+
     public function testShouldReturnAValidIdToken()
     {
         $testConfig = $this->verifyIdTokenMinimal;