Put messages large than 4K into an attachment

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

@@ -58,6 +58,7 @@ import org.json.JSONException;
 import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileOutputStream;
+import java.io.FileWriter;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -120,6 +121,7 @@ public class ServiceSynchronize extends LifecycleService {
     private static final int CONNECT_BACKOFF_MAX = 128; // seconds
     private static final long STORE_NOOP_INTERVAL = 9 * 60 * 1000L; // ms
     private static final long FOLDER_NOOP_INTERVAL = 9 * 60 * 1000L; // ms
+    private static final int MAX_MESSAGE_BODY_SIZE = 4096;
     private static final int ATTACHMENT_BUFFER_SIZE = 8192; // bytes
 
     static final String ACTION_PROCESS_OPERATIONS = BuildConfig.APPLICATION_ID + ".PROCESS_OPERATIONS";
@@ -1267,44 +1269,94 @@ public class ServiceSynchronize extends LifecycleService {
             fp1.add(IMAPFolder.FetchProfileItem.MESSAGE);
             ifolder.fetch(new Message[]{imessage}, fp1);
 
-            EntityMessage message = new EntityMessage();
-            message.account = folder.account;
-            message.folder = folder.id;
-            message.uid = uid;
+            try {
+                db.beginTransaction();
 
-            if (!EntityFolder.ARCHIVE.equals(folder.type)) {
-                message.msgid = helper.getMessageID();
-                if (TextUtils.isEmpty(message.msgid))
-                    Log.w(Helper.TAG, "No Message-ID id=" + message.id + " uid=" + message.uid);
-            }
+                EntityMessage message = new EntityMessage();
+                message.account = folder.account;
+                message.folder = folder.id;
+                message.uid = uid;
+
+                if (!EntityFolder.ARCHIVE.equals(folder.type)) {
+                    message.msgid = helper.getMessageID();
+                    if (TextUtils.isEmpty(message.msgid))
+                        Log.w(Helper.TAG, "No Message-ID id=" + message.id + " uid=" + message.uid);
+                }
+
+                message.references = TextUtils.join(" ", helper.getReferences());
+                message.inreplyto = helper.getInReplyTo();
+                message.thread = helper.getThreadId(uid);
+                message.from = helper.getFrom();
+                message.to = helper.getTo();
+                message.cc = helper.getCc();
+                message.bcc = helper.getBcc();
+                message.reply = helper.getReply();
+                message.subject = imessage.getSubject();
+                message.body = helper.getHtml();
+                message.received = imessage.getReceivedDate().getTime();
+                message.sent = (imessage.getSentDate() == null ? null : imessage.getSentDate().getTime());
+                message.seen = seen;
+                message.ui_seen = seen;
+                message.ui_hide = false;
+
+                String large = null;
+                if (message.body != null && message.body.length() > MAX_MESSAGE_BODY_SIZE) {
+                    large = message.body;
+                    message.body = null;
+                }
+
+                message.id = db.message().insertMessage(message);
+                Log.i(Helper.TAG, folder.name + " added id=" + message.id + " uid=" + message.uid);
+
+                int sequence = 0;
+                for (EntityAttachment attachment : helper.getAttachments()) {
+                    sequence++;
+                    Log.i(Helper.TAG, "attachment seq=" + sequence +
+                            " name=" + attachment.name + " type=" + attachment.type);
+                    attachment.message = message.id;
+                    attachment.sequence = sequence;
+                    attachment.id = db.attachment().insertAttachment(attachment);
+                }
+
+                if (large != null) {
+                    sequence++;
+
+                    EntityAttachment attachment = new EntityAttachment();
+                    attachment.message = message.id;
+                    attachment.sequence = sequence;
+                    attachment.name = "body.html"; // TODO: string resource
+                    attachment.type = "text/html";
+                    attachment.size = large.length();
+                    attachment.id = db.attachment().insertAttachment(attachment);
+
+                    // Build filename
+                    File dir = new File(getFilesDir(), "attachments");
+                    dir.mkdir();
+                    File file = new File(dir, Long.toString(attachment.id));
 
-            message.references = TextUtils.join(" ", helper.getReferences());
-            message.inreplyto = helper.getInReplyTo();
-            message.thread = helper.getThreadId(uid);
-            message.from = helper.getFrom();
-            message.to = helper.getTo();
-            message.cc = helper.getCc();
-            message.bcc = helper.getBcc();
-            message.reply = helper.getReply();
-            message.subject = imessage.getSubject();
-            message.body = helper.getHtml();
-            message.received = imessage.getReceivedDate().getTime();
-            message.sent = (imessage.getSentDate() == null ? null : imessage.getSentDate().getTime());
-            message.seen = seen;
-            message.ui_seen = seen;
-            message.ui_hide = false;
-
-            message.id = db.message().insertMessage(message);
-            Log.i(Helper.TAG, folder.name + " added id=" + message.id + " uid=" + message.uid);
-
-            int sequence = 0;
-            for (EntityAttachment attachment : helper.getAttachments()) {
-                sequence++;
-                Log.i(Helper.TAG, "attachment seq=" + sequence +
-                        " name=" + attachment.name + " type=" + attachment.type);
-                attachment.message = message.id;
-                attachment.sequence = sequence;
-                attachment.id = db.attachment().insertAttachment(attachment);
+                    FileWriter out = null;
+                    try {
+                        out = new FileWriter(file);
+                        out.write(large);
+                    } catch (IOException e) {
+                        Log.e(Helper.TAG, e + "\n" + Log.getStackTraceString(e));
+                    } finally {
+                        if (out != null) {
+                            try {
+                                out.close();
+                            } catch (IOException e) {
+                                Log.e(Helper.TAG, e + "\n" + Log.getStackTraceString(e));
+                            }
+                        }
+                    }
+
+                    attachment.filename = file.getName();
+                    db.attachment().updateAttachment(attachment);
+                }
+
+                db.setTransactionSuccessful();
+            } finally {
+                db.endTransaction();
             }
 
             return 1;