Save replies in drafts.

Previously, quotes were not saved to drafts, meaning they would be lost
when leaving the conversation or app. Now, a QuoteId (which represents
the necessary data to restore the QuoteModel) is serialized and stored
in the DraftDatabase.

Fixes #7716
Closes #7729

res/values/strings.xml

@@ -53,6 +53,7 @@
     <string name="DraftDatabase_Draft_audio_snippet">(audio)</string>
     <string name="DraftDatabase_Draft_video_snippet">(video)</string>
     <string name="DraftDatabase_Draft_location_snippet">(location)</string>
+    <string name="DraftDatabase_Draft_quote_snippet">(reply)</string>
 
     <!-- AttchmentManager -->
     <string name="AttachmentManager_cant_open_media_selection">Can\'t find an app to select media.</string>

src/org/thoughtcrime/securesms/ConversationActivity.java

@@ -128,6 +128,8 @@ import org.thoughtcrime.securesms.mms.OutgoingExpirationUpdateMessage;
 import org.thoughtcrime.securesms.mms.OutgoingGroupMediaMessage;
 import org.thoughtcrime.securesms.mms.OutgoingMediaMessage;
 import org.thoughtcrime.securesms.mms.OutgoingSecureMediaMessage;
+import org.thoughtcrime.securesms.mms.QuoteId;
+import org.thoughtcrime.securesms.mms.QuoteModel;
 import org.thoughtcrime.securesms.mms.Slide;
 import org.thoughtcrime.securesms.mms.SlideDeck;
 import org.thoughtcrime.securesms.notifications.MarkReadReceiver;
@@ -1035,6 +1037,9 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
               case Draft.VIDEO:
                 setMedia(Uri.parse(draft.getValue()), MediaType.VIDEO);
                 break;
+              case Draft.QUOTE:
+                new QuoteRestorationTask(draft.getValue()).execute();
+                break;
             }
           } catch (IOException e) {
             Log.w(TAG, e);
@@ -1431,6 +1436,12 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
       else if (slide.hasImage() && slide.getUri() != null)    drafts.add(new Draft(Draft.IMAGE, slide.getUri().toString()));
     }
 
+    Optional<QuoteModel> quote = inputPanel.getQuote();
+
+    if (quote.isPresent()) {
+      drafts.add(new Draft(Draft.QUOTE, new QuoteId(quote.get().getId(), quote.get().getAuthor()).serialize()));
+    }
+
     return drafts;
   }
 
@@ -2134,4 +2145,33 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
       }
     }
   }
+
+  private class QuoteRestorationTask extends AsyncTask<Void, Void, MessageRecord> {
+
+    private final String serialized;
+
+    QuoteRestorationTask(@NonNull String serialized) {
+      this.serialized = serialized;
+    }
+
+    @Override
+    protected MessageRecord doInBackground(Void... voids) {
+      QuoteId quoteId = QuoteId.deserialize(serialized);
+
+      if (quoteId != null) {
+        return DatabaseFactory.getMmsSmsDatabase(getApplicationContext()).getMessageFor(quoteId.getId(), quoteId.getAuthor());
+      }
+
+      return null;
+    }
+
+    @Override
+    protected void onPostExecute(MessageRecord messageRecord) {
+      if (messageRecord != null) {
+        handleReplyMessage(messageRecord);
+      } else {
+        Log.e(TAG, "Failed to restore a quote from a draft. No matching message record.");
+      }
+    }
+  }
 }

src/org/thoughtcrime/securesms/database/DraftDatabase.java

@@ -101,6 +101,7 @@ public class DraftDatabase extends Database {
     public static final String VIDEO    = "video";
     public static final String AUDIO    = "audio";
     public static final String LOCATION = "location";
+    public static final String QUOTE    = "quote";
 
     private final String type;
     private final String value;
@@ -125,6 +126,7 @@ public class DraftDatabase extends Database {
       case VIDEO:    return context.getString(R.string.DraftDatabase_Draft_video_snippet);
       case AUDIO:    return context.getString(R.string.DraftDatabase_Draft_audio_snippet);
       case LOCATION: return context.getString(R.string.DraftDatabase_Draft_location_snippet);
+      case QUOTE:    return context.getString(R.string.DraftDatabase_Draft_quote_snippet);
       default:       return null;
       }
     }

src/org/thoughtcrime/securesms/database/MmsSmsDatabase.java

@@ -19,6 +19,7 @@ package org.thoughtcrime.securesms.database;
 import android.content.Context;
 import android.database.Cursor;
 import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.util.Log;
 
 import net.sqlcipher.database.SQLiteDatabase;
@@ -71,8 +72,24 @@ public class MmsSmsDatabase extends Database {
     super(context, databaseHelper);
   }
 
-  public Cursor getMessagesFor(long timestamp) {
-    return queryTables(PROJECTION, MmsSmsColumns.NORMALIZED_DATE_SENT + " = " + timestamp, null, null);
+  public @Nullable MessageRecord getMessageFor(long timestamp, Address author) {
+    MmsSmsDatabase db = DatabaseFactory.getMmsSmsDatabase(context);
+
+    try (Cursor cursor = queryTables(PROJECTION, MmsSmsColumns.NORMALIZED_DATE_SENT + " = " + timestamp, null, null)) {
+      MmsSmsDatabase.Reader reader = db.readerFor(cursor);
+
+      MessageRecord messageRecord;
+
+      while ((messageRecord = reader.getNext()) != null) {
+        if ((Util.isOwnNumber(context, author) && messageRecord.isOutgoing()) ||
+            (!Util.isOwnNumber(context, author) && messageRecord.getIndividualRecipient().getAddress().equals(author)))
+        {
+          return messageRecord;
+        }
+      }
+    }
+
+    return null;
   }
 
   public Cursor getConversation(long threadId, long limit) {

src/org/thoughtcrime/securesms/jobs/PushDecryptJob.java

@@ -865,32 +865,22 @@ public class PushDecryptJob extends ContextJob {
       return Optional.absent();
     }
 
-    MmsSmsDatabase db     = DatabaseFactory.getMmsSmsDatabase(context);
     Address       author  = Address.fromExternal(context, quote.get().getAuthor().getNumber());
+    MessageRecord message = DatabaseFactory.getMmsSmsDatabase(context).getMessageFor(quote.get().getId(), author);
 
-    try (Cursor cursor = db.getMessagesFor(quote.get().getId())) {
-      MmsSmsDatabase.Reader reader = db.readerFor(cursor);
-
-      MessageRecord messageRecord;
-
-      while ((messageRecord = reader.getNext()) != null) {
-        if ((Util.isOwnNumber(context, author) && messageRecord.isOutgoing()) ||
-            (!Util.isOwnNumber(context, author) && messageRecord.getIndividualRecipient().getAddress().equals(author)))
-        {
+    if (message != null) {
       Log.w(TAG, "Found matching message record...");
+
       List<Attachment> attachments = new LinkedList<>();
 
-          if (messageRecord.isMms()) {
-            attachments = ((MmsMessageRecord)messageRecord).getSlideDeck().asAttachments();
+      if (message.isMms()) {
+        attachments = ((MmsMessageRecord) message).getSlideDeck().asAttachments();
       }
 
-          return Optional.of(new QuoteModel(quote.get().getId(), author, messageRecord.getBody(), attachments));
-        }
-      }
+      return Optional.of(new QuoteModel(quote.get().getId(), author, message.getBody(), attachments));
     }
 
     Log.w(TAG, "Didn't find matching message record...");
-
     return Optional.of(new QuoteModel(quote.get().getId(),
                                       author,
                                       quote.get().getText(),

src/org/thoughtcrime/securesms/mms/QuoteId.java

@@ -0,0 +1,59 @@
+package org.thoughtcrime.securesms.mms;
+
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.util.Log;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.thoughtcrime.securesms.database.Address;
+import org.thoughtcrime.securesms.database.model.MessageRecord;
+
+/**
+ * Represents the information required to find the {@link MessageRecord} pointed to by a quote.
+ */
+public class QuoteId {
+
+  private static final String TAG = QuoteId.class.getSimpleName();
+
+  private static final String ID      = "id";
+  private static final String AUTHOR  = "author";
+
+  private final long    id;
+  private final Address author;
+
+  public QuoteId(long id, @NonNull Address author) {
+    this.id     = id;
+    this.author = author;
+  }
+
+  public long getId() {
+    return id;
+  }
+
+  public @NonNull Address getAuthor() {
+    return author;
+  }
+
+  public @NonNull String serialize() {
+    try {
+      JSONObject object = new JSONObject();
+      object.put(ID, id);
+      object.put(AUTHOR, author.serialize());
+      return object.toString();
+    } catch (JSONException e) {
+      Log.e(TAG, "Failed to serialize to json", e);
+      return "";
+    }
+  }
+
+  public static @Nullable QuoteId deserialize(@NonNull String serialized) {
+    try {
+      JSONObject json = new JSONObject(serialized);
+      return new QuoteId(json.getLong(ID), Address.fromSerialized(json.getString(AUTHOR)));
+    } catch (JSONException e) {
+      Log.e(TAG, "Failed to deserialize from json", e);
+      return null;
+    }
+  }
+}