OkHttp Accept Self-signed SSL Certificate

NetworkUtilsAcceptSelfSignedSslCert.java

// package ... ;

/**
 * Copyright (C) 2014 Square, Inc.
 * <p>
 * Licensed 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.
 * <p>
 * Original source: https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/PostMultipart.java
 * Modified by: ErlangParasu <erlangparasu@protonmail.com> 2017-01-17
 */

import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.KeyManager;
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 okhttp3.Call;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class NetworkUtilsAcceptSelfSignedSslCert {

    final private String TAG = "Tag.NetworkUtilsAcceptSelfSignedSslCert";
    final private String HOST = "192.168.43.176";
    final private String BASE_URL = "https://" + HOST;

    public String run() {
        /**
         * Does OkHttp support accepting self-signed SSL certs?
         * answered May 24 '16 at 7:25 by: Gugelhupf
         *
         * https://stackoverflow.com/questions/23103174/does-okhttp-support-accepting-self-signed-ssl-certs/37406961#37406961
         */

        /**
         * Modified by: ErlangParasu (erlangparasu@protonmail.com) (2017-02-22)
         */

        /* Trust All Certificates */
        final TrustManager[] trustManagers = new TrustManager[]{new X509TrustManager() {
            @Override
            public X509Certificate[] getAcceptedIssuers() {
                X509Certificate[] x509Certificates = new X509Certificate[0];
                return x509Certificates;
            }

            @Override
            public void checkServerTrusted(final X509Certificate[] chain,
                                           final String authType) throws CertificateException {
                System.out.println(TAG + ": authType: " + String.valueOf(authType));
            }

            @Override
            public void checkClientTrusted(final X509Certificate[] chain,
                                           final String authType) throws CertificateException {
                System.out.println(TAG + ": authType: " + String.valueOf(authType));
            }
        }};

        X509TrustManager x509TrustManager = new X509TrustManager() {
            @Override
            public X509Certificate[] getAcceptedIssuers() {
                X509Certificate[] x509Certificates = new X509Certificate[0];
                return x509Certificates;
            }

            @Override
            public void checkServerTrusted(final X509Certificate[] chain,
                                           final String authType) throws CertificateException {
                System.out.println(TAG + ": authType: " + String.valueOf(authType));
            }

            @Override
            public void checkClientTrusted(final X509Certificate[] chain,
                                           final String authType) throws CertificateException {
                System.out.println(TAG + ": authType: " + String.valueOf(authType));
            }
        };

        OkHttpClient.Builder okHttpClientBuilder = new OkHttpClient.Builder();
        try {
            final String PROTOCOL = "SSL";
            SSLContext sslContext = SSLContext.getInstance(PROTOCOL);
            KeyManager[] keyManagers = null;
            SecureRandom secureRandom = new SecureRandom();
            sslContext.init(keyManagers, trustManagers, secureRandom);
            SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
            okHttpClientBuilder.sslSocketFactory(sslSocketFactory, x509TrustManager);
        } catch (Exception e) {
            e.printStackTrace();
        }

        HostnameVerifier hostnameVerifier = new HostnameVerifier() {
            @Override
            public boolean verify(String hostname, SSLSession session) {
                System.out.println(TAG + ": hostname: " + String.valueOf(hostname));
                if (hostname.equals(HOST)) {
                    return true;
                }
                return false;
            }
        };

        okHttpClientBuilder.hostnameVerifier(hostnameVerifier);
        OkHttpClient okHttpClient = okHttpClientBuilder.build();

        try {
            MultipartBody.Builder mbBuilder = new MultipartBody.Builder();
            mbBuilder.setType(MultipartBody.FORM);
            mbBuilder.addFormDataPart("id", "user_one");

            RequestBody requestBody = mbBuilder.build();

            Request.Builder requestBuilder = new Request.Builder();
            requestBuilder.url(BASE_URL);
            requestBuilder.post(requestBody);

            Request request = requestBuilder.build();

            Call call = okHttpClient.newCall(request);
            Response response = call.execute();

            if (response.isSuccessful()) {
                String responseBody = response.body().string();
                return responseBody;
            } else {
                return null;
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}