added email attachment support

account/src/main/java/de/muehlencord/shared/account/business/mail/MailService.java

@@ -20,7 +20,12 @@ import javax.mail.internet.MimeMultipart;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import de.muehlencord.shared.account.configuration.AccountConfigurationValue;
+import java.io.File;
+import java.io.IOException;
 import java.io.Serializable;
+import java.nio.file.Files;
+import java.util.ArrayList;
+import java.util.List;
 
 /**
  *
@@ -77,16 +82,17 @@ public class MailService implements Serializable {
     public String sendHTMLMail(String recipient, String subject, MailDatamodel dataModel, String templateName) throws MailException {
         return sendHTMLMail(recipient, subject, dataModel, templateName, null);
     }
-    
+
     public String sendHTMLMail(String recipient, String subject, MailDatamodel dataModel, String htmlTemplateName, String plainTemplateName) throws MailException {
-        return sendHTMLMail(recipient, null, null, subject, dataModel, htmlTemplateName, plainTemplateName, "UTF-8");
+        return sendHTMLMail(recipient, null, null, subject, dataModel, htmlTemplateName, plainTemplateName, "UTF-8", new ArrayList<>());
-    }
-    
-    public String sendHTMLMail(String recipient, String ccRecipient, String bccRecipient, String subject, MailDatamodel dataModel, String htmlTemplateName, String plainTemplateName) throws MailException {
-        return sendHTMLMail(recipient, ccRecipient, bccRecipient, subject, dataModel, htmlTemplateName, plainTemplateName, "UTF-8");
     }
 
-    public String sendHTMLMail(String recipient, String ccRecipient, String bccRecipient, String subject, MailDatamodel dataModel, String htmlTemplateName, String plainTemplateName, String encoding) throws MailException {
+    public String sendHTMLMail(String recipient, String ccRecipient, String bccRecipient, String subject, MailDatamodel dataModel, String htmlTemplateName, String plainTemplateName) throws MailException {
+        return sendHTMLMail(recipient, ccRecipient, bccRecipient, subject, dataModel, htmlTemplateName, plainTemplateName, "UTF-8", new ArrayList<>());
+    }
+
+    public String sendHTMLMail(String recipient, String ccRecipient, String bccRecipient, String subject,
+            MailDatamodel dataModel, String htmlTemplateName, String plainTemplateName, String encoding, List<File> attachments) throws MailException {
         try {
             MimeMessage message = new MimeMessage(mailSession);
             message.setFrom(); // use default from
@@ -97,23 +103,48 @@ public class MailService implements Serializable {
             if (bccRecipient != null) {
                 message.setRecipients(Message.RecipientType.BCC, InternetAddress.parse(bccRecipient, false));
             }
-                        
+
             message.setSubject(subject, encoding);
             
+            Multipart contentMultiPart = new MimeMultipart("alternative");
 
             String htmlBody = mailTemplateService.getStringFromTemplate(htmlTemplateName, dataModel);
             MimeBodyPart htmlBodyPart = new MimeBodyPart();
             htmlBodyPart.setContent(htmlBody, "text/html; charset=UTF-8");
-
+            contentMultiPart.addBodyPart(htmlBodyPart);
-            Multipart multipart = new MimeMultipart("alternative");
+            
             if (plainTemplateName != null) {
                 String plainBody = mailTemplateService.getStringFromTemplate(plainTemplateName, dataModel);
                 MimeBodyPart plainBodyPart = new MimeBodyPart();
                 plainBodyPart.setText(plainBody, "UTF-8");
-                multipart.addBodyPart(plainBodyPart);
+                contentMultiPart.addBodyPart(plainBodyPart);
+            }
+            
+            
+            if ((attachments == null) || (attachments.isEmpty())) {
+                message.setContent(contentMultiPart);
+            } else {
+                MimeBodyPart contentBodyPart = new MimeBodyPart();
+                contentBodyPart.setContent(contentMultiPart);
+
+                MimeMultipart messageMultipart = new MimeMultipart("related");
+                messageMultipart.addBodyPart(contentBodyPart); 
+                for (File attachment : attachments) {
+                    try {
+                        MimeBodyPart attachmentBodyPart = new MimeBodyPart();
+                        attachmentBodyPart.attachFile(attachment);
+                        String contentType = Files.probeContentType(attachment.toPath());
+                        if (contentType != null) {
+                            attachmentBodyPart.setHeader("Content-Type", contentType);
+                        }
+                        messageMultipart.addBodyPart(attachmentBodyPart);
+                    } catch (IOException ex) {
+                        throw new MailException("Cannot attach " + attachment.toString() + " to email. Reason: " + ex.toString(), ex);
+                    }
+                }
+                
+                message.setContent (messageMultipart); 
             }
-            multipart.addBodyPart(htmlBodyPart);
-            message.setContent(multipart);
 
             return transportMail(message);
         } catch (MessagingException | MailTemplateException ex) {
@@ -144,7 +175,6 @@ public class MailService implements Serializable {
         String baseUrl = configService.getConfigValue(configKey);
         String resetUrlWithToken = baseUrl + "/login.xhtml?token=" + token;        
          */
-        
         String resetUrlWithToken = passwordResetUrl + "?token=" + token;
         model.addParameter("url", baseUrl);
         model.addParameter("resetUrl", resetUrlWithToken);