feat(jans-core): added pure java discovery sample custom script

#318

jans-linux-setup/jans_setup/static/extension/discovery/Discovery.java

@@ -0,0 +1,51 @@
+/* Copyright (c) 2022, Gluu
+ Author: Yuriy Z
+ */
+
+import io.jans.model.SimpleCustomProperty;
+import io.jans.model.custom.script.model.CustomScript;
+import io.jans.model.custom.script.type.discovery.DiscoveryType;
+import io.jans.service.custom.script.CustomScriptManager;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.json.JSONObject;
+
+import java.util.Map;
+
+public class Discovery implements DiscoveryType {
+
+    private static final Logger log = LoggerFactory.getLogger(Discovery.class);
+    private static final Logger scriptLogger = LoggerFactory.getLogger(CustomScriptManager.class);
+
+    @Override
+    public boolean init(Map<String, SimpleCustomProperty> configurationAttributes) {
+        log.info("Init of Discovery Java custom script");
+        return true;
+    }
+
+    @Override
+    public boolean init(CustomScript customScript, Map<String, SimpleCustomProperty> configurationAttributes) {
+        log.info("Init of Discovery Java custom script");
+        return true;
+    }
+
+    @Override
+    public boolean destroy(Map<String, SimpleCustomProperty> configurationAttributes) {
+        log.info("Destroy of Discovery Java custom script");
+        return true;
+    }
+
+    @Override
+    public int getApiVersion() {
+        log.info("getApiVersion Discovery Java custom script: 11");
+        return 11;
+    }
+
+    @Override
+    public boolean modifyResponse(Object responseAsJsonObject, Object context) {
+        scriptLogger.info("write to script logger");
+        JSONObject response = (JSONObject) responseAsJsonObject;
+        response.accumulate("key_from_java", "value_from_script_on_java");
+        return true;
+    }
+}