Convert HTML-messages to Markdown via "Copy Down"-lib.

README.md

@@ -10,8 +10,7 @@ market use a normal email server as an intermediate step.
 For this reason I developed this small program which provides a SMTP-to-RocketChat-gateway. You can simply send an e-mail
 to a specific user (The e-mail address must be provided for each user account) and he will get a message directly in 
 RocketChat. Attachments in the email are converted to file uploads in RocketChat. Since RocketChat, for security 
-reasons, does not support HTML-rendering, HTML-emails are converted to plain-text messages. The original messages
-are additionally sent as file uploads.
+reasons, does not support HTML-rendering, HTML-emails are converted into Markdown-format.
 
 # How to use the program
 

build.gradle

@@ -17,6 +17,7 @@ dependencies {
     implementation('com.google.code.gson:gson:2.10.1')
     implementation('net.sourceforge.argparse4j:argparse4j:0.9.0')
     implementation('org.jsoup:jsoup:1.17.2')
+    implementation('io.github.furstenheim:copy_down:1.1')
 }
 
 test {

src/main/java/rocketgateway/RocketGateway.java

@@ -16,8 +16,8 @@ public static void main(String[] args) throws IOException {
         CommandLineParser parser = new CommandLineParser(args);
         Namespace res = parser.getRes();
 
-        String configfile = res.get("configfile");
-        ConfigFileParser configFileParser = new ConfigFileParser(configfile);
+        String configFile = res.get("configfile");
+        ConfigFileParser configFileParser = new ConfigFileParser(configFile);
         boolean error = configFileParser.parse();
 
         if (error) {

src/main/java/rocketgateway/message/RocketEmlMessage.java

@@ -1,11 +1,10 @@
 package rocketgateway.message;
 
+import io.github.furstenheim.CopyDown;
 import jakarta.activation.DataSource;
 import jakarta.mail.*;
 import jakarta.mail.internet.InternetAddress;
 import jakarta.mail.internet.MimeMessage;
-import org.jsoup.Jsoup;
-import org.jsoup.nodes.Document;
 import rocketgateway.apache_commons_email.MimeMessageParser;
 
 import java.io.InputStream;
@@ -15,6 +14,7 @@ public class RocketEmlMessage {
     private final InputStream data;
     private final Set<RocketEmlAddress> recipients;
     private final List<RocketEmlAttachment> attachments;
+    private final CopyDown converter;
     private String date;
     private String sender;
     private String subject;
@@ -30,6 +30,7 @@ public RocketEmlMessage(InputStream data) {
         this.body = "";
         this.recipients = new HashSet<>();
         this.attachments = new ArrayList<>();
+        this.converter = new CopyDown();
     }
 
     /**
@@ -68,13 +69,7 @@ public void parseEML() {
             // If there is no plain body check if there is a html body.
             if (this.body.isEmpty() & mimeMessageParser.hasHtmlContent()) {
                 String htmlContent = mimeMessageParser.getHtmlContent();
-
-                // Strip html body of all tags.
-                Document doc = Jsoup.parse(htmlContent);
-                this.body = doc.text().strip().replaceAll("\r\n", "\n");
-
-                // Make an attachment from the original html body so the user can see the original message.
-                this.attachments.add(new RocketEmlAttachment(this.subject+".html", "text/html", htmlContent.getBytes()));
+                this.body = converter.convert(htmlContent);
             }
 
             // Check if there are attachments
@@ -83,6 +78,7 @@ public void parseEML() {
                     for (DataSource attachment : mimeMessageParser.getAttachmentList()) {
                         String filename = Optional.ofNullable(attachment.getName()).orElse("unknown.dat");
                         String mimeType = Optional.ofNullable(attachment.getContentType()).orElse("application/octet-stream");
+
                         try (InputStream stream = attachment.getInputStream()) {
                             byte[] content = stream.readAllBytes();