Attach autocrypt public key

app/src/main/java/eu/faircode/email/Core.java

@@ -66,6 +66,7 @@ import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
+import java.io.FileWriter;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -97,6 +98,7 @@ import javax.mail.FolderNotFoundException;
 import javax.mail.Message;
 import javax.mail.MessageRemovedException;
 import javax.mail.MessagingException;
+import javax.mail.Part;
 import javax.mail.Session;
 import javax.mail.Store;
 import javax.mail.UIDFolder;
@@ -2148,6 +2150,31 @@ class Core {
                 Log.i(folder.name + " added id=" + message.id + " uid=" + message.uid);
 
                 int sequence = 1;
+
+                String autocrypt = helper.getAutocrypt();
+                if (autocrypt != null) {
+                    EntityAttachment attachment = new EntityAttachment();
+                    attachment.message = message.id;
+                    attachment.sequence = sequence++;
+                    attachment.name = "pubkey.pem";
+                    attachment.type = "application/pgp-keys";
+                    attachment.disposition = Part.ATTACHMENT;
+                    attachment.id = db.attachment().insertAttachment(attachment);
+
+                    File file = attachment.getFile(context);
+                    try (FileWriter writer = new FileWriter(file)) {
+                        writer.write("-----BEGIN PGP PUBLIC KEY BLOCK-----\r\n\r\n");
+                        while (autocrypt.length() > 0) {
+                            int i = Math.min(64, autocrypt.length());
+                            writer.write(autocrypt.substring(0, i) + "\r\n");
+                            autocrypt = autocrypt.substring(i);
+                        }
+                        writer.write("-----END PGP PUBLIC KEY BLOCK-----\r\n");
+                    }
+
+                    db.attachment().setDownloaded(attachment.id, file.length());
+                }
+
                 List<EntityAttachment> attachments = parts.getAttachments();
                 for (EntityAttachment attachment : attachments) {
                     Log.i(folder.name + " attachment seq=" + sequence + " " + attachment);

app/src/main/java/eu/faircode/email/MessageHelper.java

@@ -236,10 +236,12 @@ public class MessageHelper {
                     StringBuilder sb = new StringBuilder();
                     try (BufferedReader br = new BufferedReader(new FileReader(file))) {
                         String line;
-                        while ((line = br.readLine()) != null)
+                        while ((line = br.readLine()) != null) {
+                            Log.i(line);
                             if (!line.startsWith("-----") && !line.endsWith("-----"))
                                 sb.append(line);
                         }
+                    }
 
                     imessage.addHeader("Autocrypt",
                             "addr=" + from.getAddress() + ";" +
@@ -876,6 +878,20 @@ public class MessageHelper {
         }
     }
 
+    String getAutocrypt() throws MessagingException {
+        String autocrypt = imessage.getHeader("Autocrypt", null);
+        if (autocrypt == null)
+            return null;
+
+        autocrypt = MimeUtility.unfold(autocrypt);
+
+        int k = autocrypt.indexOf("keydata=");
+        if (k < 0)
+            return null;
+
+        return autocrypt.substring(k + 8);
+    }
+
     String getSubject() throws MessagingException {
         String subject = imessage.getHeader("Subject", null);
         if (subject == null)