Spring Boot 3 - RestTemplate with ignored HTTPS/SSL certificate (ignore untrusted certificates)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
// ---------------------------------------------------------------------
// pom.xml file:
// ---------------------------------------------------------------------

/*
    <dependency>
        <groupId>org.apache.httpcomponents.client5</groupId>
        <artifactId>httpclient5</artifactId>
        <version>5.2.1</version>
    </dependency>
*/



// ---------------------------------------------------------------------
// Program.java file:
// ---------------------------------------------------------------------

package com.example;

import java.io.IOException;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;

import javax.net.ssl.SSLContext;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
import org.apache.hc.client5.http.classic.HttpClient;
import org.apache.hc.client5.http.impl.classic.HttpClientBuilder;
import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManager;
import org.apache.hc.client5.http.socket.ConnectionSocketFactory;
import org.apache.hc.client5.http.socket.PlainConnectionSocketFactory;
import org.apache.hc.client5.http.ssl.SSLConnectionSocketFactory;
import org.apache.hc.core5.http.URIScheme;
import org.apache.hc.core5.http.config.Registry;
import org.apache.hc.core5.http.config.RegistryBuilder;
import org.apache.hc.core5.ssl.SSLContextBuilder;

public class Program {

	public static void main(String[] args) throws KeyManagementException, NoSuchAlgorithmException, KeyStoreException, CertificateException, IOException {

		SSLContext sslContext = SSLContextBuilder.create()
			.loadTrustMaterial((X509Certificate[] certificateChain, String authType) -> true)  // <--- accepts each certificate
			.build();

		Registry<ConnectionSocketFactory> socketRegistry = RegistryBuilder.<ConnectionSocketFactory>create()
			.register(URIScheme.HTTPS.getId(), new SSLConnectionSocketFactory(sslContext))
			.register(URIScheme.HTTP.getId(), new PlainConnectionSocketFactory())
			.build();

		HttpClient httpClient = HttpClientBuilder.create()
			.setConnectionManager(new PoolingHttpClientConnectionManager(socketRegistry))
			.setConnectionManagerShared(true)
			.build();

        ClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory(httpClient);
        RestTemplate restTemplate = new RestTemplate(requestFactory);

		String responseBody = restTemplate.getForObject("https://localhost:5000/path/to/resource", String.class);

		System.out.println(responseBody);
	}
}


// See also:
//
//     1. https://dirask.com/snippets/Spring-Boot-3-RestTemplate-with-custom-HTTPS-SSL-certificate-1GM8Yp


// References:
//
//     1. https://mvnrepository.com/artifact/org.apache.httpcomponents.client5/httpclient5