Store crash info as draft email

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

@@ -20,6 +20,57 @@ package eu.faircode.email;
 */
 
 import android.app.Application;
+import android.util.Log;
+
+import java.util.Date;
+
+import javax.mail.Address;
+import javax.mail.internet.InternetAddress;
 
 public class ApplicationEx extends Application {
+    private Thread.UncaughtExceptionHandler prev = null;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+
+        prev = Thread.getDefaultUncaughtExceptionHandler();
+
+        Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
+            @Override
+            public void uncaughtException(Thread thread, Throwable ex) {
+                Log.w(Helper.TAG, "Handling crash");
+                DB db = null;
+                try {
+                    db = DB.getBlockingInstance(ApplicationEx.this);
+                    EntityFolder drafts = db.folder().getPrimaryDraftFolder();
+                    if (drafts != null) {
+                        Address to = new InternetAddress("marcel+email@faircode.eu", "FairCode");
+
+                        EntityMessage draft = new EntityMessage();
+                        draft.account = drafts.account;
+                        draft.folder = drafts.id;
+                        draft.to = MessageHelper.encodeAddresses(new Address[]{to});
+                        draft.subject = BuildConfig.APPLICATION_ID + " crash info";
+                        draft.body = "<pre>" + ex.toString().replaceAll("\\r?\\n", "<br />") + "</pre>";
+                        draft.received = new Date().getTime();
+                        draft.seen = false;
+                        draft.ui_seen = false;
+                        draft.ui_hide = false;
+                        draft.id = db.message().insertMessage(draft);
+
+                        Log.w(Helper.TAG, "Crash info stored as draft");
+                    }
+                } catch (Throwable e1) {
+                    Log.e(Helper.TAG, e1 + "\n" + Log.getStackTraceString(e1));
+                } finally {
+                    if (db != null)
+                        db.close();
+                }
+
+                if (prev != null)
+                    prev.uncaughtException(thread, ex);
+            }
+        });
+    }
 }

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

@@ -68,6 +68,10 @@ public abstract class DB extends RoomDatabase {
         return sInstance;
     }
 
+    public static DB getBlockingInstance(Context context) {
+        return migrate(Room.databaseBuilder(context.getApplicationContext(), DB.class, DB_NAME).allowMainThreadQueries());
+    }
+
     private static DB migrate(RoomDatabase.Builder<DB> builder) {
         return builder
                 .addMigrations(MIGRATION_1_2)