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package org.openslx.bwlp.sat.mail;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import javax.security.auth.login.LoginException;
import org.apache.log4j.Logger;
import org.openslx.bwlp.sat.database.mappers.DbConfiguration;
import org.openslx.bwlp.sat.database.mappers.DbMailQueue;
import org.openslx.bwlp.sat.database.mappers.DbUser;
import org.openslx.bwlp.sat.database.mappers.DbUser.User;
import org.openslx.bwlp.sat.mail.MailTemplatePlain.Template;
import org.openslx.bwlp.sat.mail.SmtpMailer.EncryptionMode;
import org.openslx.bwlp.sat.maintenance.MailFlusher;
import org.openslx.bwlp.thrift.iface.TNotFoundException;
import org.openslx.bwlp.thrift.iface.UserInfo;
import org.openslx.util.QuickTimer;
import org.openslx.util.QuickTimer.Task;
import org.openslx.util.Util;
public class MailQueue {
public static class MailConfig {
public String host;
public int port;
public EncryptionMode ssl;
public String senderAddress;
public String replyTo;
public String password;
public String username;
public String serverName;
}
private static final Logger LOGGER = Logger.getLogger(MailQueue.class);
private static final int BATCH_SIZE = 25;
private static boolean busy = false;
/**
* Convenience wrapper for {@link DbMailQueue#queue(Mail)}, swallowing any
* {@link SQLException}, so the mailing will keep going (or try to at least)
*
* @param mail Mail to queue for sending
*/
public static void queue(Mail mail) {
try {
DbMailQueue.queue(mail);
} catch (SQLException e) {
}
}
/**
* Send queued messages. This operation is rate-limited. In case there might
* be more messages to send, this function will return after sending some of
* them, and schedule a maintenance job that will trigger this method again.
*
* @throws InterruptedException
*/
public static void flush() throws InterruptedException {
synchronized (MailQueue.class) {
if (busy) // Will run again when the scheduler decides to
return;
busy = true;
}
try {
List<Mail> queuedMails;
try {
queuedMails = DbMailQueue.getQueued(BATCH_SIZE);
} catch (SQLException e) {
LOGGER.error("Cannot retrieve queued mails from DB");
return;
}
// Anything to do?
if (queuedMails.isEmpty())
return;
// Fetch SMTP config
MailConfig conf;
try {
conf = DbConfiguration.getMailConfig();
} catch (SQLException e) {
conf = null;
return;
}
if (!MailGenerator.isValidMailConfig(conf)) {
LOGGER.error("Cannot send mail with no mail config");
return;
}
// Setup mailer
SmtpMailer smtpc;
try {
smtpc = new SmtpMailer(conf.host, conf.port, conf.ssl, conf.senderAddress, conf.serverName,
conf.replyTo, conf.username, conf.password, null);
} catch (InvalidKeyException | LoginException | NoSuchAlgorithmException
| InvalidKeySpecException | IOException e) {
LOGGER.error("Could not initialize connection to SMTP server. Mails will not be sent", e);
return;
}
// Iterate over mail: Group by receiving user
Map<String, List<Mail>> batch = new HashMap<>();
for (Mail mail : queuedMails) {
List<Mail> list = batch.get(mail.userId);
if (list == null) {
list = new ArrayList<>();
batch.put(mail.userId, list);
}
list.add(mail);
}
// Send all the mails
int delaySeconds = 2;
boolean sendOk = true;
for (List<Mail> userBatch : batch.values()) {
if (userBatch.isEmpty()) {
continue; // Now how the hell did that happen?
}
User cachedUser;
try {
cachedUser = DbUser.getCached(userBatch.get(0).userId);
} catch (TNotFoundException | SQLException e) {
LOGGER.warn("Cannot get user for id " + userBatch.get(0).userId
+ ": Sending mails failed.");
try {
DbMailQueue.markFailed(userBatch);
} catch (SQLException e1) {
}
continue;
}
// Double-check if user wants mail (unlikely, but user might just have changed the setting)
if (!cachedUser.local.emailNotifications) {
try {
DbMailQueue.markSent(userBatch);
} catch (SQLException e) {
}
continue;
}
StringBuilder sb = new StringBuilder();
for (Mail mail : userBatch) {
if (sb.length() != 0) {
sb.append('\n');
}
sb.append("* ");
sb.append(mail.message);
}
sendOk = sendMail(conf, smtpc, cachedUser.ui, sb.toString());
LOGGER.debug("Sending mail to " + cachedUser.ui.eMail + ": "
+ (sendOk ? "success" : "failure"));
try {
if (sendOk) {
DbMailQueue.markSent(userBatch);
} else {
DbMailQueue.markFailed(userBatch);
}
} catch (SQLException e) {
}
Thread.sleep(delaySeconds * 1000);
delaySeconds += 1;
}
smtpc.close();
// We got a full batch from DB, call flush() again in a minute
if (queuedMails.size() == BATCH_SIZE && sendOk) {
callAgainInOneMinute();
}
} finally {
synchronized (MailQueue.class) {
busy = false;
}
}
}
private static void callAgainInOneMinute() {
QuickTimer.scheduleOnce(new Task() {
@Override
public void fire() {
MailFlusher.start();
}
}, TimeUnit.MINUTES.toMillis(1));
}
private static boolean sendMail(MailConfig conf, SmtpMailer smtpc, UserInfo user, final String message) {
MailTemplate wrapper = DbConfiguration.getMailTemplate(Template.GENERAL_WRAPPER);
Map<String, String> templateArgs = new HashMap<>();
templateArgs.put("first_name", user.firstName);
templateArgs.put("last_name", user.lastName);
templateArgs.put("sender_name", conf.serverName);
templateArgs.put("messages", message);
String fullMessage = wrapper.format(templateArgs);
if (!Util.isEmptyString(conf.replyTo)) {
fullMessage += "\n\nBei weiteren Fragen wenden Sie sich bitte an den Support unter\n"
+ conf.replyTo;
}
if (fullMessage.contains("\r\n")) {
fullMessage = fullMessage.replace("\r\n", "\n");
}
if (fullMessage.contains("\n")) {
fullMessage = fullMessage.replace("\n", "\r\n");
}
return smtpc.send(user.eMail, "[bwLehrpool] Hinweise zu Ihren VMs/Veranstaltungen", fullMessage,
"<sat.bwlehrpool.de>");
}
}
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