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rsanchez
2014-10-22 ddec2c5c7b7842536d6d705c2de20f96e16c8aa8 
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package net.curisit.securis.utils;



import java.io.File;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.nio.charset.Charset;

import java.security.KeyManagementException;

import java.security.KeyStore;

import java.security.KeyStoreException;

import java.security.NoSuchAlgorithmException;

import java.security.cert.CertificateException;

import java.security.cert.X509Certificate;

import java.util.Map;

import java.util.concurrent.Executor;

import java.util.concurrent.Executors;



import javax.inject.Singleton;



import net.curisit.securis.SeCurisException;



import org.apache.commons.io.IOUtils;

import org.apache.http.HttpResponse;

import org.apache.http.auth.AuthScope;

import org.apache.http.auth.UsernamePasswordCredentials;

import org.apache.http.client.CredentialsProvider;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.conn.ssl.SSLConnectionSocketFactory;

import org.apache.http.entity.ContentType;

import org.apache.http.entity.mime.HttpMultipartMode;

import org.apache.http.entity.mime.MultipartEntityBuilder;

import org.apache.http.entity.mime.content.FileBody;

import org.apache.http.impl.client.BasicCredentialsProvider;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClientBuilder;

import org.apache.http.ssl.SSLContextBuilder;

import org.apache.http.ssl.TrustStrategy;

import org.apache.logging.log4j.LogManager;

import org.apache.logging.log4j.Logger;



/**

 * Component that send emails using Mailgun API:

 * http://documentation.mailgun.com/user_manual.html#sending-messages

 * 

 * @author roberto <roberto.sanchez@curisit.net>

 */

@Singleton

public class EmailManager {



    private static final Logger LOG = LogManager.getLogger(EmailManager.class);



    private final String serverUrl;

    private final CloseableHttpClient httpClient;



    /**

     * 

     * @throws SeCurisException

     */

    private EmailManager() throws SeCurisException {

        String domain = Params.get(Params.KEYS.MAILGUN_DOMAIN);

        if (domain == null) {

            throw new SeCurisException("Please, add '" + Params.KEYS.MAILGUN_DOMAIN + "' parameter to config file");

        }

        serverUrl = String.format("https://api.mailgun.net/v2/%s/messages", domain);

        httpClient = createHttpClient();



    }



    private CloseableHttpClient createHttpClient() throws SeCurisException {

        SSLContextBuilder builder = new SSLContextBuilder();

        SSLConnectionSocketFactory sslsf = null;

        try {

            builder.loadTrustMaterial((KeyStore) null, new TrustStrategy() {

                @Override

                public boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException {

                    return true;

                }

            });

            sslsf = new SSLConnectionSocketFactory(builder.build());

        } catch (NoSuchAlgorithmException | KeyStoreException | KeyManagementException e1) {

            LOG.error(e1);

            throw new SeCurisException("Error creating SSL socket factory");

        }

        CredentialsProvider provider = new BasicCredentialsProvider();

        UsernamePasswordCredentials credentials = new UsernamePasswordCredentials("api", Params.get(Params.KEYS.MAILGUN_API_KEY));

        provider.setCredentials(AuthScope.ANY, credentials);



        return HttpClientBuilder.create().setDefaultCredentialsProvider(provider).setSSLSocketFactory(sslsf).build();

    }



    /**

     * Basic method to send emails in text mode with attachment. The method is

     * synchronous, It waits until server responses.

     * 

     * @param subject

     * @param body

     * @param to

     * @param file

     * @throws SeCurisException

     * @throws UnsupportedEncodingException

     */

    public void sendEmail(String subject, String body, String to, String cc, File file) throws SeCurisException, UnsupportedEncodingException {

        HttpPost postRequest = new HttpPost(serverUrl);



        MultipartEntityBuilder builder = MultipartEntityBuilder.create();



        builder.setCharset(Charset.forName("utf-8"));

        builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);

        builder.addTextBody("from", Params.get(Params.KEYS.EMAIL_FROM_ADDRESS));

        builder.addTextBody("to", to);

        if (cc != null)

            builder.addTextBody("cc", cc);

        builder.addTextBody("subject", subject, ContentType.create(ContentType.TEXT_PLAIN.getMimeType(), Charset.forName("utf-8")));

        builder.addTextBody("text", body, ContentType.create(ContentType.TEXT_PLAIN.getMimeType(), Charset.forName("utf-8")));

        if (file != null)

            builder.addPart("attachment", new FileBody(file));



        postRequest.setEntity(builder.build());

        HttpResponse response;

        try {

            response = httpClient.execute(postRequest);



            String jsonLic = IOUtils.toString(response.getEntity().getContent());

            if (response.getStatusLine().getStatusCode() == 200) {

                LOG.debug("Response content read OK: {}", jsonLic);

                Map<String, Object> responseBean = JsonUtils.json2map(jsonLic);



                LOG.debug("Response mail read OK: {}", responseBean);

            } else {

                throw new SeCurisException("Error sending email, response estatus: " + response.getStatusLine());

            }

        } catch (IOException e) {

            LOG.error("Error sending email", e);

            throw new SeCurisException("Error sending email");

        }

    }



    /**

     * Basic method to send emails in text mode with attachment. The method is

     * asynchronous, It returns immediately

     * 

     * @param subject

     * @param body

     * @param to

     * @param file

     * @throws SeCurisException

     * @throws UnsupportedEncodingException

     */

    public void sendEmailAsync(String subject, String body, String to, String cc, File file, EmailCallback callback) throws SeCurisException,

            UnsupportedEncodingException {

        Executor ex = Executors.newSingleThreadExecutor();

        ex.execute(new Runnable() {



            @Override

            public void run() {

                try {

                    EmailManager.this.sendEmail(subject, body, to, cc, file);

                    callback.success();

                } catch (UnsupportedEncodingException e) {

                    callback.error(new SeCurisException("Error sending email", e));

                } catch (SeCurisException e) {

                    callback.error(e);

                }



            }

        });



    }



    public static interface EmailCallback {

        public void success();



        public void error(SeCurisException e);

    }



    public static void main(String[] args) throws SeCurisException, UnsupportedEncodingException {

        // new EmailManager().sendEmail("España así de bien",

        // "Me gusta esta prueba\nCon varias líneas\n\n\n--\nNo response",

        // "info@r75.es", new File(

        // "/Users/rob/Downloads/test.req"));

        new EmailManager().sendEmailAsync("España así de bien", "Me gusta esta prueba\nCon varias líneas\n\n\n--\nNo response", "info@r75.es",

                "dev@r75.es", new File("/Users/rob/Downloads/test.req"), new EmailCallback() {



                    @Override

                    public void success() {

                        LOG.info("Success!!!");

                    }



                    @Override

                    public void error(SeCurisException e) {

                        LOG.error("Error: {} !!!", e);

                    }

                });

        LOG.info("Waiting for email to be sent...");

    }



}