Merge pull request #10057 from chris9408/feature/BAEL-4415

BAEL-4415 get a list of trusted certificates in Java

core-java-modules/core-java-security-2/src/test/java/com/baeldung/trustedcert/CertificatesUnitTest.java

@@ -0,0 +1,94 @@
+package com.baeldung.trustedcert;
+
+import org.junit.jupiter.api.Test;
+
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.TrustManagerFactory;
+import javax.net.ssl.X509TrustManager;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.cert.Certificate;
+import java.security.cert.CertificateException;
+import java.security.cert.PKIXParameters;
+import java.security.cert.TrustAnchor;
+import java.security.cert.X509Certificate;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+public class CertificatesUnitTest {
+
+    private static final String GODADDY_CA_ALIAS = "godaddyrootg2ca [jdk]";
+
+    @Test
+    public void whenLoadingCacertsKeyStore_thenCertificatesArePresent() throws Exception {
+        KeyStore keyStore = loadKeyStore();
+        PKIXParameters params = new PKIXParameters(keyStore);
+
+        Set<TrustAnchor> trustAnchors = params.getTrustAnchors();
+        List<Certificate> certificates = trustAnchors.stream()
+          .map(TrustAnchor::getTrustedCert)
+          .collect(Collectors.toList());
+
+        assertFalse(certificates.isEmpty());
+    }
+
+    @Test
+    public void whenLoadingDefaultKeyStore_thenCertificatesArePresent() throws Exception {
+        TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
+        trustManagerFactory.init((KeyStore)null);
+
+        List<TrustManager> trustManagers = Arrays.asList(trustManagerFactory.getTrustManagers());
+        List<X509Certificate> certificates = trustManagers.stream()
+          .filter(X509TrustManager.class::isInstance)
+          .map(X509TrustManager.class::cast)
+          .map(trustManager -> Arrays.asList(trustManager.getAcceptedIssuers()))
+          .flatMap(Collection::stream)
+          .collect(Collectors.toList());
+
+        assertFalse(certificates.isEmpty());
+    }
+
+    @Test
+    public void whenLoadingKeyStore_thenGoDaddyCALabelIsPresent() throws Exception {
+        KeyStore keyStore = loadKeyStore();
+
+        Enumeration<String> aliasEnumeration = keyStore.aliases();
+        List<String> aliases = Collections.list(aliasEnumeration);
+
+        assertTrue(aliases.contains(GODADDY_CA_ALIAS));
+    }
+
+    @Test
+    public void whenLoadingKeyStore_thenGoDaddyCertificateIsPresent() throws Exception {
+        KeyStore keyStore = loadKeyStore();
+
+        Certificate goDaddyCertificate = keyStore.getCertificate(GODADDY_CA_ALIAS);
+
+        assertNotNull(goDaddyCertificate);
+    }
+
+    private KeyStore loadKeyStore() throws CertificateException, NoSuchAlgorithmException, IOException, KeyStoreException {
+        String relativeCacertsPath = "/lib/security/cacerts".replace("/", File.separator);
+        String filename = System.getProperty("java.home") + relativeCacertsPath;
+        FileInputStream is = new FileInputStream(filename);
+
+        KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
+        String password = "changeit";
+        keystore.load(is, password.toCharArray());
+
+        return keystore;
+    }
+}