com.github.slavaz.maven.plugin.postgresql.embedded.proxy.ProxyUtils Maven / Gradle / Ivy

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package com.github.slavaz.maven.plugin.postgresql.embedded.proxy;

import java.net.Authenticator;
import java.net.PasswordAuthentication;

import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.collections4.IterableUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.maven.plugin.logging.Log;
import org.apache.maven.settings.Proxy;
import org.apache.maven.settings.Settings;

/**
 * Helper class to handler proxy configuration based on Maven settings
 * @author Gonzalo Gómez García 
 */
public class ProxyUtils {

    private static final String SP_HTTP_PROXY_HOST = "http.proxyHost";

    private static final String SP_HTTP_PROXY_PORT = "http.proxyPort";

    private static final String SP_HTTP_NO_PROXY = "http.nonProxyHosts";

    private static final String PROTOCOL_HTTP = "http";

    /**
     * Thie method sets the proper system properties to force http connections to use proxy when
     * downloading Postgres binaries If system property http.proxyHost is already set, the proxies
     * defined on settings are not taken in consideration Authentication is taken in consideration
     * using {@link Authenticator#setDefault(Authenticator)}
     * @param settings
     *            Maven settings
     * @param logger
     *            Maven logger
     */
    public static void handleProxyConfigurjation(final Settings settings, final Log logger) {

        if (isAbleToSetupProxy(settings)) {
            setupProxy(settings, logger);
        } else {
            logger.info(String.format("Using system properties proxy configuration: %s:%s. no proxy: %s",
                    System.getProperty(SP_HTTP_PROXY_HOST), System.getProperty(SP_HTTP_PROXY_PORT),
                    System.getProperty(SP_HTTP_NO_PROXY)));
        }

    }

    private static void setupProxy(final Settings settings, final Log logger) {

        final Proxy proxy = getProxy(settings);

        if (isProxyValid(proxy)) {
            setupProxyProperties(logger, proxy);
            setupNonProxyHostsProperties(logger, proxy);
            setupProxyCredentials(logger, proxy);
        }
    }

    private static void setupProxyCredentials(final Log logger, final Proxy proxy) {
        if (StringUtils.isNotBlank(proxy.getUsername())) {
            Authenticator.setDefault(new Authenticator() {
                @Override
                public PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(proxy.getUsername(), proxy.getPassword()
                            .toCharArray());
                }
            });

            logger.info(String.format("Proxy settings authentication detected. %s:*****", proxy.getUsername()));
        }
    }

    private static void setupNonProxyHostsProperties(final Log logger, final Proxy proxy) {
        if (StringUtils.isNotBlank(proxy.getNonProxyHosts())) {
            System.setProperty(SP_HTTP_NO_PROXY, proxy.getNonProxyHosts());
            logger.info(String.format("No proxy:  %s", proxy.getNonProxyHosts()));
        }
    }

    private static void setupProxyProperties(final Log logger, final Proxy proxy) {
        System.setProperty(SP_HTTP_PROXY_HOST, proxy.getHost());
        System.setProperty(SP_HTTP_PROXY_PORT, String.valueOf(proxy.getPort()));

        logger.info(String.format("Proxy settings detected:  %s:%s", proxy.getHost(), proxy.getPort()));
    }

    private static boolean isProxyValid(final Proxy proxy) {
        return proxy != null && StringUtils.isNotBlank(proxy.getHost()) && proxy.getPort() > 0;
    }

    private static Proxy getProxy(final Settings settings) {
        return IterableUtils.find(settings.getProxies(), (Proxy item) -> item.isActive()
                && (PROTOCOL_HTTP.equalsIgnoreCase(item.getProtocol()) || StringUtils.isBlank(item.getProtocol())));
    }

    private static boolean isAbleToSetupProxy(final Settings settings) {
        return settings != null && StringUtils.isBlank(System.getProperty(SP_HTTP_PROXY_HOST))
                && CollectionUtils.isNotEmpty(settings.getProxies());
    }

}