require 'pg'
-require 'common/plugin'
+require 'common/agendav_plugin'
require 'rm/rm_plugin'
-class AgendavDb
- include Plugin
- include RmPlugin
-
- def initialize()
- cfg = Configuration.new()
- @db_host = cfg.agendav_dbhost
- @db_port = cfg.agendav_dbport
- @db_opts = cfg.agendav_dbopts
- @db_tty = cfg.agendav_dbtty
- @db_name = cfg.agendav_dbname
- @db_user = cfg.agendav_dbuser
- @db_pass = cfg.agendav_dbpass
- end
-
-
- def describe_domain(domain)
- # AgenDAV doesn't have a concept of domains.
- return 'N/A'
- end
-
- def describe_account(account)
- if self.user_exists(account)
- return "Username: #{account}"
- else
- return 'User not found'
- end
- end
+# Handle the removal of Agendav users from its database. Agendav has
+# no concept of domains.
+#
+class AgendavRm
- def delete_domain(domain)
- # AgenDAV doesn't have a concept of domains.
- end
+ include AgendavPlugin
+ include RmPlugin
- def delete_account(account)
- # Delete the given username and any records in other tables
- # belonging to it.
+ # Remove *user* from the Agendav database. This should remove him
+ # from _every_ table in which he is referenced.
+ #
+ # We do not raise an error if the user doesn't exist. This is due to
+ # an unfortunate problem with the "user exists" check in AgenDAV.
+ # The AgenDAV "shares" table is not tied directly to a username, so
+ # we are forced to use a regexp match to decide what rows to delete
+ # from that table. We do so regardless of whether or not the username
+ # exists in the "prefs" table, because that table stores only non-
+ # default preferences -- not all users' preferences.
+ #
+ # @param user [User] the user to remove.
+ #
+ def remove_user(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
- connection = PGconn.connect(@db_host,
- @db_port,
- @db_opts,
- @db_tty,
- @db_name,
- @db_user,
- @db_pass)
-
sql_queries.each do |sql_query|
- connection.query(sql_query, [account])
- end
-
- connection.close()
-
- rescue PGError => e
- # Pretend like we're database-agnostic in case we ever are.
- raise DatabaseError.new(e)
- end
-
- end
-
-
- def get_leftover_domains(db_domains)
- # AgenDAV doesn't have a concept of domains.
- return []
- end
-
-
- def get_leftover_accounts(db_accounts)
- # Get a list of all users who have logged in to AgenDAV.
- ad_accounts = self.get_agendav_usernames()
- return ad_accounts - db_accounts
- end
-
-
- protected;
-
- def user_exists(account)
- ad_users = get_agendav_usernames()
- return ad_users.include?(account)
- end
-
- def get_agendav_usernames()
- usernames = []
-
- # Just assume PostgreSQL for now.
- begin
- connection = PGconn.connect(@db_host,
- @db_port,
- @db_opts,
- @db_tty,
- @db_name,
- @db_user,
- @db_pass)
-
- sql_query = '(SELECT username FROM prefs)'
- sql_query += 'UNION'
- sql_query += '(SELECT user_from FROM shared);'
-
- connection.query(sql_query) do |result|
- usernames = result.field_values('username')
+ connection.sync_exec_params(sql_query, [user.to_s()])
end
-
+ ensure
+ # Make sure the connection gets closed even if a query explodes.
connection.close()
- rescue PGError => e
- # Pretend like we're database-agnostic in case we ever are.
- raise DatabaseError.new(e)
end
-
- return usernames
end
end