social-util-library/src/main/java/org/gcube/socialnetworking/socialtoken/SanitizedURL.java

package org.gcube.socialnetworking.socialtoken;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.Objects;

/**
 * @author Luca Frosini (ISTI - CNR)
 * @author Massimiliano Assante (ISTI - CNR)
 */
public class SanitizedURL {
	
	private static String CHARACTERS_TO_REMOVE = "[\\{\\}\\[\\]\\.\\,\\;\\(\\)\\:\\\"\\'\\“\\”\\‘\\’\\«\\»]";
	
	protected String prefix;
	protected String postfix;
	protected final URL url;
	
	public SanitizedURL(String urlString) throws MalformedURLException {
		if(Objects.isNull(urlString) || urlString.isEmpty() || urlString.length()<2) {
			throw new MalformedURLException();
		}
		
		prefix = "";
		postfix = "";
		
		urlString = stripPrefix(urlString);
		
		if(urlString.startsWith("www.")) {
			urlString = "http://" + urlString;
		}
		
		postfix = "";
		urlString = stripPostfix(urlString);
		
		
		
		url = new URL(urlString);
	}

	private String stripPrefix(String urlString) throws MalformedURLException {
		if(Objects.isNull(urlString) || urlString.isEmpty() || urlString.length()<2) {
			throw new MalformedURLException();
		}
		
		String testPrefix = urlString.substring(0,1);
		if(testPrefix.matches(CHARACTERS_TO_REMOVE)) {
			prefix = prefix + urlString.substring(0, 1);
			urlString = urlString.substring(1);
			urlString = stripPrefix(urlString);
		}
		
		return urlString;
	}
	
	private String stripPostfix(String urlString) throws MalformedURLException {
		if(Objects.isNull(urlString) || urlString.isEmpty() || urlString.length()<2) {
			throw new MalformedURLException();
		}
		
		String testPostfix = urlString.substring(urlString.length()-1);
		if(testPostfix.matches(CHARACTERS_TO_REMOVE)) {
			postfix = urlString.substring(urlString.length()-1) + postfix;
			urlString = urlString.substring(0, urlString.length()-1);
			
			/*
			 * The urlString could terminate with more than one character to be escaped
			 * So we need to further analyse the sanitised URL
			 * e.g. 'https://data.d4science.net/tfXA),' terminates with '),'
			 */
			urlString = stripPostfix(urlString);
		}
		return urlString;
	}
	
	public String getPrefix() {
		return prefix;
	}

	public String getPostfix() {
		return postfix;
	}

	public URL getURL() {
		return url;
	}
	
}