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package pl.allegro.tech.hermes.common.ssl.jvm;

import pl.allegro.tech.hermes.common.ssl.TrustManagersProvider;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.security.KeyStore;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;

import static java.lang.String.format;

public class JvmTrustManagerProvider implements TrustManagersProvider {

    @Override
    public TrustManager[] getTrustManagers() throws Exception {
        TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
        trustManagerFactory.init(loadJvmKeyStore());
        return trustManagerFactory.getTrustManagers();
    }

    private KeyStore loadJvmKeyStore() throws Exception {
        String trustStore = System.getProperty("javax.net.ssl.trustStore", "");
        String trustStorePassword = System.getProperty("javax.net.ssl.trustStorePassword");
        String trustStoreType = System.getProperty("javax.net.ssl.trustStoreType", KeyStore.getDefaultType());
        String trustStoreProvider = System.getProperty("javax.net.ssl.trustStoreProvider", "");

        KeyStore keyStore = trustStoreProvider.isEmpty()
                ? KeyStore.getInstance(trustStoreType)
                : KeyStore.getInstance(trustStoreType, trustStoreProvider);
        char[] password = trustStorePassword == null ? null : trustStorePassword.toCharArray();
        keyStore.load(trustStoreInputStream(trustStore), password);

        return keyStore;
    }

    private InputStream trustStoreInputStream(String trustStore) throws FileNotFoundException {
        return new FileInputStream(trustStore.isEmpty() ? defaultTrustStore() : new File(trustStore));
    }

    private File defaultTrustStore() throws FileNotFoundException {
        String javaHome = System.getProperty("java.home");

        File jssecacerts = new File(format("%s/lib/security/jssecacerts", javaHome));
        if (jssecacerts.exists()) {
            return jssecacerts;
        }

        File cacerts = new File(format("%s/lib/security/cacerts", javaHome));
        if (cacerts.exists()) {
            return cacerts;
        }

        throw new FileNotFoundException("Default trust store not found.");
    }
}