Ensure we use the same collation on all tables

This is required since some older cloudrons have a mixed bag of
collations and thus charsets and we add foreign keys across those, which
require the same collation

migrations/20171118000000-ensure-collation-utf8_bin.js

@@ -0,0 +1,31 @@
+'use strict';
+
+// WARNING!!
+// At this point the default db collation is utf8mb4_unicode_ci however we already have foreign key constraits
+// already with tables on utf8_bin charset, so we cannot convert all tables here to utf8mb4 collation without
+// a reimport from a sql dump, as foreign keys across different collations are not supported
+
+var async = require('async');
+
+exports.up = function(db, callback) {
+    async.series([
+        db.runSql.bind(db, 'ALTER TABLE appPortBindings CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin'),
+        db.runSql.bind(db, 'ALTER TABLE apps CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin'),
+        db.runSql.bind(db, 'ALTER TABLE authcodes CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin'),
+        db.runSql.bind(db, 'ALTER TABLE backups CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin'),
+        db.runSql.bind(db, 'ALTER TABLE clients CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin'),
+        db.runSql.bind(db, 'ALTER TABLE eventlog CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin'),
+        db.runSql.bind(db, 'ALTER TABLE groupMembers CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin'),
+        db.runSql.bind(db, 'ALTER TABLE groups CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin'),
+        db.runSql.bind(db, 'ALTER TABLE mailboxes CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin'),
+        db.runSql.bind(db, 'ALTER TABLE migrations CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin'),
+        db.runSql.bind(db, 'ALTER TABLE settings CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin'),
+        db.runSql.bind(db, 'ALTER TABLE tokens CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin'),
+        db.runSql.bind(db, 'ALTER TABLE users CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin')
+    ], callback);
+};
+
+exports.down = function(db, callback) {
+    // nothing to be done here
+    callback();
+};