From 5570d4519cf3fdfdea45aec409a48c61e781e933 Mon Sep 17 00:00:00 2001
From: Matthias Piepkorn <mpiepk@gmail.com>
Date: Tue, 14 Nov 2017 19:42:27 +0000
Subject: [PATCH] compatibility for Keycloak 3.4

---
 src/main/java/org/keycloak/protocol/cas/endpoints/ValidateEndpoint.java |   32 +++++++++++++++++++++++++++-----
 src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java           |   15 +++++++++++++--
 2 files changed, 40 insertions(+), 7 deletions(-)

diff --git a/src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java b/src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java
index cbcf1d0..b796962 100644
--- a/src/main/java/org/keycloak/protocol/cas/CASLoginProtocol.java
+++ b/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();
 
diff --git a/src/main/java/org/keycloak/protocol/cas/endpoints/ValidateEndpoint.java b/src/main/java/org/keycloak/protocol/cas/endpoints/ValidateEndpoint.java
index ed9d5fa..c250578 100644
--- a/src/main/java/org/keycloak/protocol/cas/endpoints/ValidateEndpoint.java
+++ b/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);

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