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/* Copyright 2016 OpenMarket Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Update any email addresses that were stored with mixed case into all
* lowercase
*/
-- There may be "duplicate" emails (with different case) already in the table,
-- so we find them and move all but the most recently used account.
UPDATE user_threepids
SET medium = 'email_old'
WHERE medium = 'email'
AND address IN (
-- We select all the addresses that are linked to the user_id that is NOT
-- the most recently created.
SELECT u.address
FROM
user_threepids AS u,
-- `duplicate_addresses` is a table of all the email addresses that
-- appear multiple times and when the binding was created
(
SELECT lower(u1.address) AS address, max(u1.added_at) AS max_ts
FROM user_threepids AS u1
INNER JOIN user_threepids AS u2 ON u1.medium = u2.medium AND lower(u1.address) = lower(u2.address) AND u1.address != u2.address
WHERE u1.medium = 'email' AND u2.medium = 'email'
GROUP BY lower(u1.address)
) AS duplicate_addresses
WHERE
lower(u.address) = duplicate_addresses.address
AND u.added_at != max_ts -- NOT the most recently created
);
-- This update is now safe since we've removed the duplicate addresses.
UPDATE user_threepids SET address = LOWER(address) WHERE medium = 'email';
/* Add an index for the select we do on passwored reset */
CREATE INDEX user_threepids_medium_address on user_threepids (medium, address);
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