Added CasValidator

restservice/pom.xml

@@ -31,6 +31,12 @@
       <scope>test</scope>
     </dependency>
 
+    <dependency>
+      <groupId>org.apache.httpcomponents</groupId>
+      <artifactId>httpclient</artifactId>
+      <version>4.5.10</version>
+    </dependency>
+
     <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-web</artifactId>

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;
+
+        }
+
+    }
+}

restservice/src/test/java/com/plannaplan/security/CasValidatorTest.java

@@ -0,0 +1,21 @@
+package com.plannaplan.security;
+
+import org.junit.Ignore;
+import org.junit.Test;
+
+public class CasValidatorTest {
+
+    @Test
+    @Ignore
+    public void shouldValidateTicket() {
+        //you need to privide fresh ticket to make this test pass that's why it is marked as ignored
+        CasValidator validator = new CasValidator("http://localhost:3000",
+                "ST-572267-cbgKrcJLd0tdCubeLqdW-cas.amu.edu.pl");
+        try {
+            System.out.println(validator.validate());
+        } catch (Exception e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        }
+    }
+}