Added CasValidator

restservice/src/main/java/com/plannaplan/security/CasValidator.java

@@ -0,0 +1,42 @@
+package com.plannaplan.security;
+
+import java.net.URLEncoder;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClients;
+import org.apache.http.util.EntityUtils;
+
+public class CasValidator {
+    private static String CAS_URL = "https://cas.amu.edu.pl/cas";
+    private final CloseableHttpClient httpClient = HttpClients.createDefault();
+    private String service;
+    private String ticket;
+
+    public CasValidator(String service, String ticket) {
+        this.service = service;
+        this.ticket = ticket;
+    }
+
+    public String validate() throws Exception {
+        HttpGet request = new HttpGet(CasValidator.CAS_URL + "/validate?service="
+                + URLEncoder.encode(this.service, "UTF-8") + "&ticket=" + URLEncoder.encode(this.ticket, "UTF-8"));
+        try (CloseableHttpResponse response = httpClient.execute(request)) {
+
+            HttpEntity entity = response.getEntity();
+
+            String result = null;
+            if (entity != null) {
+                // return it as a String
+                result = EntityUtils.toString(entity);
+
+            }
+            String res = result.substring(result.indexOf('\n') + 1);
+            return res;
+
+        }
+
+    }
+}