code improvements & delete task endpoint

common/src/main/java/ch/unisg/common/valueobject/ExecutorURI.java

@@ -8,11 +8,16 @@ public class ExecutorURI {
     private String value;
 
     public ExecutorURI(String uri) throws InvalidExecutorURIException {
-        if (uri.equalsIgnoreCase("localhost") ||
-            uri.matches("^((25[0-5]|(2[0-4]|1\\d|[1-9]|)\\d)(\\.(?!$)|$)){4}$")) {
-            this.value = uri;
-        } else {
+        String ip = uri.split(":")[0];
+        int port = Integer.parseInt(uri.split(":")[1]);
+        // Check if valid ip4
+        if (!ip.equalsIgnoreCase("localhost") &&
+            !uri.matches("^((25[0-5]|(2[0-4]|1\\d|[1-9]|)\\d)(\\.(?!$)|$)){4}$")) {
+            throw new InvalidExecutorURIException();
+        // Check if valid port
+        } else if (port < 1024 || port > 65535) {
             throw new InvalidExecutorURIException();
         }
+        this.value = uri;
     }
 }