compatibility for Keycloak 3.4

 src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java

@@ -18,6 +18,7 @@
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.URI;

public class CASLoginProtocol implements LoginProtocol {
@@ -91,9 +92,19 @@

        String service = clientSession.getRedirectUri();
        //TODO validate service
        accessCode.setAction(CommonClientSessionModel.Action.CODE_TO_TOKEN.name());

        String code;
        try {
            // Keycloak >3.4 branch: Method getCode was renamed to getOrGenerateCode, CODE_TO_TOKEN was removed
            Method getOrGenerateCode = ClientSessionCode.class.getMethod("getOrGenerateCode");
            code = (String) getOrGenerateCode.invoke(accessCode);
        } catch (ReflectiveOperationException e) {
            // Keycloak <=3.3 branch
            accessCode.setAction(CommonClientSessionModel.Action.CODE_TO_TOKEN.name());
            code = accessCode.getCode();
        }
        KeycloakUriBuilder uriBuilder = KeycloakUriBuilder.fromUri(service);
        uriBuilder.queryParam(TICKET_RESPONSE_PARAM, SERVICE_TICKET_PREFIX + accessCode.getCode());
        uriBuilder.queryParam(TICKET_RESPONSE_PARAM, SERVICE_TICKET_PREFIX + code);

        URI redirectUri = uriBuilder.build();


 src/main/java/org/keycloak/protocol/cas/endpoints/ValidateEndpoint.java

@@ -18,6 +18,7 @@

import javax.ws.rs.GET;
import javax.ws.rs.core.*;
import java.lang.reflect.Method;

public class ValidateEndpoint {
    protected static final Logger logger = Logger.getLogger(ValidateEndpoint.class);
@@ -136,7 +137,17 @@
            event.detail(Details.CODE_ID, parts[2]);
        }

        ClientSessionCode.ParseResult<AuthenticatedClientSessionModel> parseResult = ClientSessionCode.parseResult(code, session, realm, AuthenticatedClientSessionModel.class);
        ClientSessionCode.ParseResult<AuthenticatedClientSessionModel> parseResult;
        try {
            // Keycloak >3.4 branch: Parameter event was added to ClientSessionCode.parseResult
            Method parseResultMethod = ClientSessionCode.class.getMethod("parseResult",
                    String.class, KeycloakSession.class, RealmModel.class, EventBuilder.class, Class.class);
            parseResult = (ClientSessionCode.ParseResult<AuthenticatedClientSessionModel>) parseResultMethod.invoke(
                    null, code, session, realm, event, AuthenticatedClientSessionModel.class);
        } catch (ReflectiveOperationException e) {
            // Keycloak <=3.3 branch
            parseResult = ClientSessionCode.parseResult(code, session, realm, AuthenticatedClientSessionModel.class);
        }
        if (parseResult.isAuthSessionNotFound() || parseResult.isIllegalHash()) {
            event.error(Errors.INVALID_CODE);

@@ -151,13 +162,24 @@

        clientSession = parseResult.getClientSession();

        if (!parseResult.getCode().isValid(AuthenticatedClientSessionModel.Action.CODE_TO_TOKEN.name(), ClientSessionCode.ActionType.CLIENT)) {
            event.error(Errors.INVALID_CODE);
            throw new CASValidationException(CASErrorCode.INVALID_TICKET, "Code is expired", Response.Status.BAD_REQUEST);
        try {
            // Keycloak >3.4 branch: Method isExpiredToken was added
            Method isExpiredToken = ClientSessionCode.ParseResult.class.getMethod("isExpiredToken");
            if ((Boolean) isExpiredToken.invoke(parseResult)) {
                event.error(Errors.EXPIRED_CODE);
                throw new CASValidationException(CASErrorCode.INVALID_TICKET, "Code is expired", Response.Status.BAD_REQUEST);
            }
        } catch (ReflectiveOperationException e) {
            // Keycloak <=3.3 branch
            if (!parseResult.getCode().isValid(AuthenticatedClientSessionModel.Action.CODE_TO_TOKEN.name(), ClientSessionCode.ActionType.CLIENT)) {
                event.error(Errors.INVALID_CODE);
                throw new CASValidationException(CASErrorCode.INVALID_TICKET, "Code is expired", Response.Status.BAD_REQUEST);
            }

            parseResult.getCode().setAction(null);
        }

        clientSession.setNote(CASLoginProtocol.SESSION_SERVICE_TICKET, ticket);
        parseResult.getCode().setAction(null);

        if (requireReauth && AuthenticationManager.isSSOAuthentication(clientSession)) {
            event.error(Errors.SESSION_EXPIRED);