raise NonexistentUserError.new(user.to_s()) if not user_exists(user)
sql_queries = ['DELETE FROM prefs WHERE username = $1;']
- sql_queries << 'DELETE FROM shared WHERE user_from = $1;'
+
+ # The "shares" table contains principal URLs, and the "@" symbol
+ # is usually encoded to "%40". These queries do a regex match on
+ # the username after replacing the "%40" with a "@".
+ #
+ # As a precaution, I haven chosen not to delete based on the
+ # "calendar" field here. Nobody should have a calendar named
+ # "user%40example.com", but it's not impossible -- and we don't
+ # want to delete that calendar when the not-necessarily-related
+ # "user@example.com" account is removed. And the usual appearance
+ # of the user's email address in the "calendar" field happens when
+ # he is also the owner, so the calendar does get deleted in the
+ # normal situation.
+ sql_queries << "DELETE FROM shares WHERE REPLACE(owner, '%40', '@') ~ $1;"
+ sql_queries << "DELETE FROM shares WHERE REPLACE(with, '%40', '@') ~ $1;"
connection = PG::Connection.new(@db_hash)
begin