bbps-backend/src/main/java/com/billpaymentservice/bbps/config/RestClientConfig.java

package com.billpaymentservice.bbps.config;

import java.security.cert.X509Certificate;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestClient;

@Configuration
public class RestClientConfig {

    @Bean
    public RestClient restClient() throws Exception {

        // Create Trust-All SSL context
        TrustManager[] trustAllCerts = new TrustManager[]{
            new X509TrustManager() {
                public X509Certificate[] getAcceptedIssuers() {
                    return new X509Certificate[0];
                }
                public void checkClientTrusted(X509Certificate[] certs, String authType) {}
                public void checkServerTrusted(X509Certificate[] certs, String authType) {}
            }
        };

        SSLContext sslContext = SSLContext.getInstance("TLS");
        sslContext.init(null, trustAllCerts, new java.security.SecureRandom());

        // Use JDK's Simple HTTP client with custom SSL context
        SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
        requestFactory.setBufferRequestBody(false);

        // Apply SSL context to HttpsURLConnection globally
        HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());
        HttpsURLConnection.setDefaultHostnameVerifier((hostname, session) -> true);

        return RestClient.builder()
                .requestFactory(requestFactory)
                .build();
    }
}