/*******************************************************************************
 * Copyright 2014 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *******************************************************************************/
package at.gv.egovernment.moa.id.protocols.oauth20;

import java.io.UnsupportedEncodingException;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang.StringUtils;

import com.google.gson.JsonObject;

public final class OAuth20Util {
	
	public static final String REGEX_HTTPS = "^(https?)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]";
	public static final String REGEX_FILE = "^(file):/.[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]";
	
	private OAuth20Util() {
		throw new InstantiationError();
	}
	
	/**
	 * Simple helper function to add parameter to a url
	 * 
	 * @param url
	 * @param name
	 * @param value
	 * @throws UnsupportedEncodingException
	 */
	public static void addParameterToURL(final StringBuilder url, final String name, final String value)
			throws UnsupportedEncodingException {
		if (url.indexOf("?") < 0) {
			url.append("?");
		} else {
			url.append("&");
		}
		// URLEncoder.encode(value, "UTF-8")
		url.append(name).append("=").append(value);
	}
	
	public static boolean isUrl(final String url) {
		Pattern urlPattern;
		if (url.startsWith("file")) {
			urlPattern = Pattern.compile(REGEX_FILE, Pattern.CASE_INSENSITIVE);
		} else {
			urlPattern = Pattern.compile(REGEX_HTTPS, Pattern.CASE_INSENSITIVE);
		}
		
		Matcher matcher = urlPattern.matcher(url);
		return matcher.find();
	}
	
	public static boolean isValidStateValue(String state) {
		Pattern urlPattern = Pattern.compile("javascript|<|>|&|;", Pattern.CASE_INSENSITIVE);
		Matcher matcher = urlPattern.matcher(state);
		return !matcher.find();
	}
	
	public static void addProperytiesToJsonObject(JsonObject jsonObject, Map<String, Object> params) {
		for (Map.Entry<String, Object> param : params.entrySet()) {
			
			if (!StringUtils.isEmpty(param.getKey()) && param.getValue() != null) {
				
				// check for integer
				try {
					int i = Integer.parseInt(String.valueOf(param.getValue()));
					jsonObject.addProperty(param.getKey(), i);
					continue;
				}
				catch (NumberFormatException e) {
				}
				
				// check for long
				try {
					long l = Long.parseLong(String.valueOf(param.getValue()));
					jsonObject.addProperty(param.getKey(), l);
					continue;
				}
				catch (NumberFormatException e) {
				}
				
				// string
				if (param.getValue() instanceof String) {
					jsonObject.addProperty(param.getKey(), String.valueOf(param.getValue()));
				}
			}
		}
	}
	
}