/*
*  Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
*  WSO2 Inc. licenses this file to you under the Apache License,
*  Version 2.0 (the "License"); you may not use this file except
*  in compliance with the License.
*  You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

package org.wso2.carbon.apimgt.integration.client.util;


import feign.Client;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Utils {

    //This method is only used if the mb features are within DAS.
    public static String replaceProperties(String text) {
        String regex = "\\$\\{(.*?)\\}";
        Pattern pattern = Pattern.compile(regex);
        Matcher matchPattern = pattern.matcher(text);
        while (matchPattern.find()) {
            String sysPropertyName = matchPattern.group(1);
            String sysPropertyValue = System.getProperty(sysPropertyName);
            if (sysPropertyValue != null && !sysPropertyName.isEmpty()) {
                text = text.replaceAll("\\$\\{(" + sysPropertyName + ")\\}", sysPropertyValue);
            }
        }
        return text;
    }

    public static Client getSSLClient() {
        return new Client.Default(getTrustedSSLSocketFactory(), new HostnameVerifier() {
            @Override
            public boolean verify(String s, SSLSession sslSession) {
                return true;
            }
        });
    }

    private static SSLSocketFactory getTrustedSSLSocketFactory() {
        try {
            TrustManager[] trustAllCerts = new TrustManager[]{
                    new X509TrustManager() {
                        public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                            return null;
                        }
                        public void checkClientTrusted(
                                java.security.cert.X509Certificate[] certs, String authType) {
                        }
                        public void checkServerTrusted(
                                java.security.cert.X509Certificate[] certs, String authType) {
                        }
                    }
            };
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, trustAllCerts, new java.security.SecureRandom());
            return sc.getSocketFactory();
        } catch (KeyManagementException | NoSuchAlgorithmException e) {
            return null;
        }

    }
}
