Add Authentication::createApiGatewayClientCredentials

Author: chadicus

src/Authentication.php

@@ -138,6 +138,43 @@ public static function createOwnerCredentials(
         return new self($getTokenRequestFunc);
     }
 
+    /**
+     * Creates a new instance of Authentication for Client Credentials grant type
+     *
+     * @param string $clientId        The oauth client id
+     * @param string $clientSecret    The oauth client secret
+     * @param string $authUrl         The oauth auth url
+     * @param string $tokenResource   The access token resource of the API
+     *
+     * @return Authentication
+     */
+    public static function createApiGatewayClientCredentials(
+        string $clientId,
+        string $clientSecret,
+        string $authUrl,
+        string $tokenResource = 'token'
+    ) : Authentication {
+        $getTokenRequestFunc = function (
+            string $unusedBaseUrl,
+            string $unusedRefreshToken = null
+        ) use (
+            $clientId,
+            $clientSecret,
+            $authUrl,
+            $tokenResource
+        ) {
+            $data = ['client_id' => $clientId, 'client_secret' => $clientSecret, 'grant_type' => 'client_credentials'];
+            return new Request(
+                'POST',
+                "{$authUrl}/oauth2/{$tokenResource}",
+                ['Content-Type' => 'application/x-www-form-urlencoded'],
+                Http::buildQueryString($data)
+            );
+        };
+
+        return new self($getTokenRequestFunc);
+    }
+
     /**
      * Extracts an access token from the given API response
      *

tests/AuthenticationTest.php

@@ -166,6 +166,34 @@ public function getTokenRequestClientCredentialsCustomTokenResource()
         );
         $this->assertSame(['Content-Type' => ['application/x-www-form-urlencoded']], $request->getHeaders());
     }
+
+    /**
+     * @test
+     * @covers ::createApiGatewayClientCredentials
+     */
+    public function createApiGatewayClientCredentials()
+    {
+        $auth = Authentication::createApiGatewayClientCredentials('not under test', 'not under test', 'http://auth');
+        $this->assertInstanceOf('\TraderInteractive\Api\Authentication', $auth);
+    }
+
+    /**
+     * @test
+     * @covers ::createApiGatewayClientCredentials
+     * @covers ::getTokenRequest
+     */
+    public function getTokenRequestApiGatewayClientCredentials()
+    {
+        $auth = Authentication::createApiGatewayClientCredentials('id', 'secret', 'authUrl');
+        $request = $auth->getTokenRequest('baseUrl');
+        $this->assertSame('authUrl/oauth2/token', (string)$request->getUri());
+        $this->assertSame('POST', $request->getMethod());
+        $this->assertSame(
+            'client_id=id&client_secret=secret&grant_type=client_credentials',
+            (string)$request->getBody()
+        );
+        $this->assertSame(['Content-Type' => ['application/x-www-form-urlencoded']], $request->getHeaders());
+    }
 }
 
 function time()