001/*-
002 * #%L
003 * HAPI FHIR - Server Framework
004 * %%
005 * Copyright (C) 2014 - 2025 Smile CDR, Inc.
006 * %%
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 *
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 * #L%
019 */
020package ca.uhn.fhir.rest.server.mail;
021
022import jakarta.annotation.Nonnull;
023import org.simplejavamail.MailException;
024import org.simplejavamail.api.email.Email;
025import org.simplejavamail.api.email.Recipient;
026import org.simplejavamail.api.mailer.Mailer;
027import org.simplejavamail.api.mailer.config.TransportStrategy;
028import org.simplejavamail.mailer.MailerBuilder;
029import org.slf4j.Logger;
030import org.slf4j.LoggerFactory;
031
032import java.util.List;
033import java.util.Objects;
034import java.util.function.Consumer;
035import java.util.stream.Collectors;
036
037public class MailSvc implements IMailSvc {
038        private static final Logger ourLog = LoggerFactory.getLogger(MailSvc.class);
039
040        private final MailConfig myMailConfig;
041        private final Mailer myMailer;
042
043        public MailSvc(@Nonnull MailConfig theMailConfig) {
044                Objects.requireNonNull(theMailConfig);
045                myMailConfig = theMailConfig;
046                myMailer = makeMailer(myMailConfig);
047        }
048
049        @Override
050        public void sendMail(@Nonnull List<Email> theEmails) {
051                Objects.requireNonNull(theEmails);
052                theEmails.forEach(theEmail -> send(theEmail, new OnSuccess(theEmail), new ErrorHandler(theEmail)));
053        }
054
055        @Override
056        public void sendMail(@Nonnull Email theEmail) {
057                send(theEmail, new OnSuccess(theEmail), new ErrorHandler(theEmail));
058        }
059
060        @Override
061        public void sendMail(
062                        @Nonnull Email theEmail, @Nonnull Runnable theOnSuccess, @Nonnull Consumer<Throwable> theErrorHandler) {
063                send(theEmail, theOnSuccess, theErrorHandler);
064        }
065
066        private void send(
067                        @Nonnull Email theEmail, @Nonnull Runnable theOnSuccess, @Nonnull Consumer<Throwable> theErrorHandler) {
068                Objects.requireNonNull(theEmail);
069                Objects.requireNonNull(theOnSuccess);
070                Objects.requireNonNull(theErrorHandler);
071                try {
072                        myMailer.sendMail(theEmail, true).whenComplete((result, ex) -> {
073                                if (ex != null) {
074                                        theErrorHandler.accept(ex);
075                                } else {
076                                        theOnSuccess.run();
077                                }
078                        });
079                } catch (MailException e) {
080                        theErrorHandler.accept(e);
081                }
082        }
083
084        @Nonnull
085        private Mailer makeMailer(@Nonnull MailConfig theMailConfig) {
086                ourLog.info(
087                                "SMTP Mailer config Hostname:[{}] | Port:[{}] | Username:[{}] | TLS:[{}]",
088                                theMailConfig.getSmtpHostname(),
089                                theMailConfig.getSmtpPort(),
090                                theMailConfig.getSmtpUsername(),
091                                theMailConfig.isSmtpUseStartTLS());
092                return MailerBuilder.withSMTPServer(
093                                                theMailConfig.getSmtpHostname(),
094                                                theMailConfig.getSmtpPort(),
095                                                theMailConfig.getSmtpUsername(),
096                                                theMailConfig.getSmtpPassword())
097                                .withTransportStrategy(
098                                                theMailConfig.isSmtpUseStartTLS() ? TransportStrategy.SMTP_TLS : TransportStrategy.SMTP)
099                                .buildMailer();
100        }
101
102        @Nonnull
103        private String makeMessage(@Nonnull Email theEmail) {
104                return " with subject [" + theEmail.getSubject() + "] and recipients ["
105                                + theEmail.getRecipients().stream().map(Recipient::getAddress).collect(Collectors.joining(",")) + "]";
106        }
107
108        private class OnSuccess implements Runnable {
109                private final Email myEmail;
110
111                private OnSuccess(@Nonnull Email theEmail) {
112                        myEmail = theEmail;
113                }
114
115                @Override
116                public void run() {
117                        ourLog.info("Email sent" + makeMessage(myEmail));
118                }
119        }
120
121        private class ErrorHandler implements Consumer<Throwable> {
122                private final Email myEmail;
123
124                private ErrorHandler(@Nonnull Email theEmail) {
125                        myEmail = theEmail;
126                }
127
128                @Override
129                public void accept(Throwable t) {
130                        ourLog.error("Email not sent" + makeMessage(myEmail), t);
131                }
132        }
133}