001package ca.uhn.fhir.jpa.subscription.match.deliver.email;
002
003/*-
004 * #%L
005 * HAPI FHIR Subscription Server
006 * %%
007 * Copyright (C) 2014 - 2022 Smile CDR, Inc.
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 *
013 *      http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022
023import ca.uhn.fhir.i18n.Msg;
024import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
025import org.apache.commons.lang3.StringUtils;
026import org.hl7.fhir.instance.model.api.IIdType;
027import org.simplejavamail.api.email.Email;
028import org.simplejavamail.email.EmailBuilder;
029import org.thymeleaf.context.Context;
030import org.thymeleaf.spring5.SpringTemplateEngine;
031import org.thymeleaf.spring5.dialect.SpringStandardDialect;
032import org.thymeleaf.templatemode.TemplateMode;
033import org.thymeleaf.templateresolver.StringTemplateResolver;
034
035import javax.annotation.Nonnull;
036import java.util.List;
037import java.util.stream.Collectors;
038
039public class EmailDetails {
040        private final SpringTemplateEngine myTemplateEngine;
041        private final Context myContext;
042
043        private String mySubjectTemplate;
044        private String myBodyTemplate;
045        private List<String> myTo;
046        private String myFrom;
047        private IIdType mySubscription;
048
049        public EmailDetails() {
050                myTemplateEngine = makeTemplateEngine();
051                myContext = new Context();
052        }
053
054        public String getBody() {
055                return myTemplateEngine.process(myBodyTemplate, myContext);
056        }
057
058        public void setBodyTemplate(String theBodyTemplate) {
059                myBodyTemplate = theBodyTemplate;
060        }
061
062        public String getFrom() {
063                return StringUtils.trim(myFrom);
064        }
065
066        public void setFrom(String theFrom) {
067                myFrom = theFrom;
068        }
069
070        public String getSubject() {
071                return myTemplateEngine.process(mySubjectTemplate, myContext);
072        }
073
074        public void setSubjectTemplate(String theSubjectTemplate) {
075                mySubjectTemplate = theSubjectTemplate;
076        }
077
078        public String getSubscriptionId() {
079                return mySubscription.toUnqualifiedVersionless().getValue();
080        }
081
082        public void setSubscription(IIdType theSubscription) {
083                mySubscription = theSubscription;
084        }
085
086        public String getTo() {
087                return myTo.stream().filter(StringUtils::isNotBlank).collect(Collectors.joining(","));
088        }
089
090        public void setTo(List<String> theTo) {
091                myTo = theTo;
092        }
093
094        public Email toEmail() {
095                try {
096                        return EmailBuilder.startingBlank()
097                                .from(getFrom())
098                                .to(getTo())
099                                .withSubject(getSubject())
100                                .withPlainText(getBody())
101                                .withHeader("X-FHIR-Subscription", getSubscriptionId())
102                                .buildEmail();
103                } catch (IllegalArgumentException e) {
104                        throw new InternalErrorException(Msg.code(3) + "Failed to create email message", e);
105                }
106        }
107
108        @Nonnull
109        private SpringTemplateEngine makeTemplateEngine() {
110                StringTemplateResolver stringTemplateResolver = new StringTemplateResolver();
111                stringTemplateResolver.setTemplateMode(TemplateMode.TEXT);
112
113                SpringStandardDialect springStandardDialect = new SpringStandardDialect();
114                springStandardDialect.setEnableSpringELCompiler(true);
115
116                SpringTemplateEngine springTemplateEngine = new SpringTemplateEngine();
117                springTemplateEngine.setDialect(springStandardDialect);
118                springTemplateEngine.setEnableSpringELCompiler(true);
119                springTemplateEngine.setTemplateResolver(stringTemplateResolver);
120
121                return springTemplateEngine;
122        }
123
124}