Add OAuth2 JWT bearer grant type support for client

ballerina-tests/tests/auth_client_auth_handler_test.bal

@@ -347,3 +347,49 @@ isolated function testClientOAuth2HandlerForRefreshTokenGrant() {
         test:assertFail(msg = "Test Failed! " + result3.message());
     }
 }
+
+@test:Config {}
+isolated function testClientOAuth2HandlerForJwtBearerGrant() {
+    http:OAuth2JwtBearerGrantConfig config = {
+        tokenUrl: "https://localhost:" + stsPort.toString() + "/oauth2/token",
+        assertion: "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c",
+        clientId: "3MVG9YDQS5WtC11paU2WcQjBB3L5w4gz52uriT8ksZ3nUVjKvrfQMrU4uvZohTftxStwNEW4cfStBEGRxRL68",
+        clientSecret: "9205371918321623741",
+        scopes: ["token-scope1", "token-scope2"],
+        clientConfig: {
+            secureSocket: {
+               cert: {
+                   path: TRUSTSTORE_PATH,
+                   password: "ballerina"
+               }
+            }
+        }
+    };
+
+    http:Request request = createDummyRequest();
+    http:ClientOAuth2Handler handler = new(config);
+    http:Request|http:ClientAuthError result1 = handler->enrich(request);
+    if (result1 is http:Request) {
+        string header = checkpanic result1.getHeader(http:AUTH_HEADER);
+        test:assertEquals(header, "Bearer 2YotnFZFEjr1zCsicMWpAA");
+    } else {
+        test:assertFail(msg = "Test Failed! " + result1.message());
+    }
+
+    map<string|string[]> headers = {};
+    map<string|string[]>|http:ClientAuthError result2 = handler.enrichHeaders(headers);
+    if (result2 is map<string|string[]>) {
+        string header = <string>result2.get(http:AUTH_HEADER);
+        test:assertEquals(header, "Bearer 2YotnFZFEjr1zCsicMWpAA");
+    } else {
+        test:assertFail(msg = "Test Failed! " + result2.message());
+    }
+
+    map<string|string[]>|http:ClientAuthError result3 = handler.getSecurityHeaders();
+    if (result3 is map<string|string[]>) {
+        string header = <string>result3.get(http:AUTH_HEADER);
+        test:assertEquals(header, "Bearer 2YotnFZFEjr1zCsicMWpAA");
+    } else {
+        test:assertFail(msg = "Test Failed! " + result3.message());
+    }
+}

ballerina/auth_types.bal

@@ -59,8 +59,13 @@ public type OAuth2RefreshTokenGrantConfig record {|
     *oauth2:RefreshTokenGrantConfig;
 |};
 
+# Represents OAuth2 JWT bearer grant configurations for OAuth2 authentication.
+public type OAuth2JwtBearerGrantConfig record {|
+    *oauth2:JwtBearerGrantConfig;
+|};
+
 # Represents OAuth2 grant configurations for OAuth2 authentication.
-public type OAuth2GrantConfig OAuth2ClientCredentialsGrantConfig|OAuth2PasswordGrantConfig|OAuth2RefreshTokenGrantConfig;
+public type OAuth2GrantConfig OAuth2ClientCredentialsGrantConfig|OAuth2PasswordGrantConfig|OAuth2RefreshTokenGrantConfig|OAuth2JwtBearerGrantConfig;
 
 # Represents file user store configurations for Basic Auth authentication.
 public type FileUserStoreConfig record {|

changelog.md

@@ -12,6 +12,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - [Introduce http:CacheConfig annotation to the resource signature](https://github.com/ballerina-platform/ballerina-standard-library/issues/1533)
 - [Add service specific media-type prefix support in http:ServiceConfig annotation](https://github.com/ballerina-platform/ballerina-standard-library/issues/1620)
 - [Add support for Map Json as query parameter](https://github.com/ballerina-platform/ballerina-standard-library/issues/1670)
+- [Add OAuth2 JWT bearer grant type support](https://github.com/ballerina-platform/ballerina-standard-library/issues/1788)
 
 ## Fixed
 - [Fix incorrect behaviour of client with mtls](https://github.com/ballerina-platform/ballerina-standard-library/issues/1708)

gradle.properties

@@ -33,5 +33,5 @@ stdlibMimeVersion=2.0.0-20210817-124100-383d13d
 stdlibCacheVersion=3.0.0-20210817-124100-cda7525
 stdlibAuthVersion=2.0.0-20210817-124700-9d2bc48
 stdlibJwtVersion=2.0.0-20210817-124700-6c6216d
-stdlibOAuth2Version=2.0.0-20210817-125000-9bf05fc
+stdlibOAuth2Version=2.0.0-20210817-153400-d6dec5e
 stdlibUuidVersion=1.0.0-20210817-124200-043a791