Add mailKeys to Countdown

Summary: Adds mailkeys and reply handler support

Test Plan: Edit Countdown, New Countdown, no errors.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D13713

resources/sql/autopatches/20150725.countdown.mailkey.1.sql

@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_countdown.countdown
+  ADD mailKey binary(20) NOT NULL;

resources/sql/autopatches/20150725.countdown.mailkey.2.php

@@ -0,0 +1,18 @@
+<?php
+
+$table = new PhabricatorCountdown();
+$conn_w = $table->establishConnection('w');
+$iterator = new LiskMigrationIterator($table);
+foreach ($iterator as $countdown) {
+  $id = $countdown->getID();
+
+  echo pht('Adding mail key for countdown %d...', $id);
+  echo "\n";
+
+  queryfx(
+    $conn_w,
+    'UPDATE %T SET mailKey = %s WHERE id = %d',
+    $table->getTableName(),
+    Filesystem::readRandomCharacters(20),
+    $id);
+}