Encode redirect URL before send it to AAI

src/main/java/eu/dnetlib/loginservice/security/oidc/OpenAIRELogoutSuccessHandler.java

@@ -10,6 +10,9 @@ import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;
 import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
 
 @Configuration
 public class OpenAIRELogoutSuccessHandler implements LogoutSuccessHandler {
@@ -21,6 +24,10 @@ public class OpenAIRELogoutSuccessHandler implements LogoutSuccessHandler {
         this.properties = properties;
     }
 
+    private String encodeValue(String value) throws UnsupportedEncodingException {
+        return URLEncoder.encode(value, StandardCharsets.UTF_8.toString());
+    }
+
     @Override
     public void onLogoutSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException {
         HttpSession session = request.getSession();
@@ -30,6 +37,6 @@ public class OpenAIRELogoutSuccessHandler implements LogoutSuccessHandler {
             redirect = properties.getRedirect();
         }
         session.invalidate();
-        response.sendRedirect(properties.getOidc().getLogout() + redirect);
+        response.sendRedirect(properties.getOidc().getLogout() + encodeValue(redirect));
     }
 }