Added oauth response messages

components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/src/main/java/org/wso2/carbon/webapp/authenticator/framework/AuthenticationInfo.java

@@ -26,6 +26,7 @@ import org.wso2.carbon.webapp.authenticator.framework.authenticator.WebappAuthen
 public class AuthenticationInfo {
 
     private WebappAuthenticator.Status status = WebappAuthenticator.Status.FAILURE;
+    private String message;
     private String username;
     private String tenantDomain;
     private int tenantId = -1;
@@ -43,6 +44,14 @@ public class AuthenticationInfo {
         return username;
     }
 
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+
     public void setUsername(String username) {
         this.username = username;
     }

components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/src/main/java/org/wso2/carbon/webapp/authenticator/framework/WebappAuthenticationValve.java

@@ -74,12 +74,12 @@ public class WebappAuthenticationValve extends CarbonTomcatValve {
                 privilegedCarbonContext.setTenantId(authenticationInfo.getTenantId());
                 privilegedCarbonContext.setTenantDomain(authenticationInfo.getTenantDomain());
                 privilegedCarbonContext.setUsername(authenticationInfo.getUsername());
-                this.processRequest(request, response, compositeValve, authenticationInfo.getStatus());
+                this.processRequest(request, response, compositeValve, authenticationInfo);
             } finally {
                 PrivilegedCarbonContext.endTenantFlow();
             }
         } else {
-            this.processRequest(request, response, compositeValve, authenticationInfo.getStatus());
+            this.processRequest(request, response, compositeValve, authenticationInfo);
         }
     }
 
@@ -113,14 +113,18 @@ public class WebappAuthenticationValve extends CarbonTomcatValve {
     }
 
     private void processRequest(Request request, Response response, CompositeValve compositeValve,
-                                WebappAuthenticator.Status status) {
+                                AuthenticationInfo authenticationInfo) {
-        switch (status) {
+        switch (authenticationInfo.getStatus()) {
             case SUCCESS:
             case CONTINUE:
                 this.getNext().invoke(request, response, compositeValve);
                 break;
             case FAILURE:
                 String msg = "Failed to authorize incoming request";
+                if(authenticationInfo.getMessage() != null && !authenticationInfo.getMessage().isEmpty()) {
+                    msg = authenticationInfo.getMessage();
+                    response.setHeader("WWW-Authenticate", msg);
+                }
                 log.error(msg);
                 AuthenticationFrameworkUtil
                         .handleResponse(request, response, HttpServletResponse.SC_UNAUTHORIZED,

components/webapp-authenticator-framework/org.wso2.carbon.webapp.authenticator.framework/src/main/java/org/wso2/carbon/webapp/authenticator/framework/authenticator/OAuthAuthenticator.java

@@ -117,6 +117,8 @@ public class OAuthAuthenticator implements WebappAuthenticator {
                     if (oAuth2TokenValidationResponseDTO.isValid()) {
                         authenticationInfo.setStatus(Status.CONTINUE);
                     }
+                } else {
+                    authenticationInfo.setMessage(oAuth2TokenValidationResponseDTO.getErrorMsg());
                 }
             }
         } catch (AuthenticationException e) {