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-- | Maintainer: Nicolas Schodet <nico@ni.fr.eu.org>
--
-- Support for MySQL/MariaDB server.
--
-- Enough to setup a database with a dedicated user for web applications.

module Propellor.Property.Mysql (
	Database(..),
	Privilege(..),
	allPrivileges,
	basicPrivileges,
	basicStructurePrivileges,
	installed,
	databaseExists,
	userGrantedOnDatabase,
) where

import Propellor
import Propellor.Base
import Data.List
import qualified Propellor.Property.Apt as Apt

newtype Database = Database String

data Privilege
	= Select
	| Insert
	| Update
	| Delete
	| Create
	| Drop
	| Index
	| Alter
	| CreateTemporaryTables
	| LockTables
	| Execute
	| CreateView
	| ShowView
	| CreateRoutine
	| AlterRoutine
	| Event
	| Trigger
	deriving (Eq, Ord)

instance Show Privilege where
	show Select = "SELECT"
	show Insert = "INSERT"
	show Update = "UPDATE"
	show Delete = "DELETE"
	show Create = "CREATE"
	show Drop = "DROP"
	show Index = "INDEX"
	show Alter = "ALTER"
	show CreateTemporaryTables = "CREATE TEMPORARY TABLES"
	show LockTables = "LOCK TABLES"
	show Execute = "EXECUTE"
	show CreateView = "CREATE VIEW"
	show ShowView = "SHOW VIEW"
	show CreateRoutine = "CREATE ROUTINE"
	show AlterRoutine = "ALTER ROUTINE"
	show Event = "EVENT"
	show Trigger = "TRIGGER"

-- | All privileges
allPrivileges :: [Privilege]
allPrivileges =
	[ Select
	, Insert
	, Update
	, Delete
	, Create
	, Drop
	, Index
	, Alter
	, CreateTemporaryTables
	, LockTables
	, Execute
	, CreateView
	, ShowView
	, CreateRoutine
	, AlterRoutine
	, Event
	, Trigger
	]

-- | Basic privileges needed to use a classic database already created.
basicPrivileges :: [Privilege]
basicPrivileges =
	[ Select
	, Insert
	, Update
	, Delete
	]

-- | Classic privileges needed to create a database and its structure.
basicStructurePrivileges :: [Privilege]
basicStructurePrivileges =
	[ Select
	, Insert
	, Update
	, Delete
	, Create
	, Drop
	, Index
	, Alter
	]

-- | Make sure a server is installed.
installed :: RevertableProperty DebianLike DebianLike
installed = install <!> remove
  where
	install = Apt.installed server
	remove = Apt.removed server
	server = ["default-mysql-server"]

-- | Create a database if it does not exist.  When reverted, remove the
-- database.
databaseExists :: Database -> RevertableProperty DebianLike DebianLike
databaseExists (Database dbname) =
	setup <!> cleanup
  where
	setup :: Property DebianLike
	setup = setup' `requires` installed

	cleanup :: Property DebianLike
	cleanup = cleanup' `requires` installed

	-- Test for database existance and create it if needed.
	setup' :: Property UnixLike
	setup' = property' desc $ \w -> do
		present <- liftIO $ dbPresent
		ensureProperty w $ setupprop present
	  where
		desc = "database " ++ dbname ++ " exists"

	setupprop :: Bool -> Property UnixLike
	setupprop True = doNothing
	setupprop False = cmdProperty "mysqladmin" ["create", dbname]
		`assume` MadeChange

	-- Test for database existance and drop it if needed.
	cleanup' :: Property UnixLike
	cleanup' = property' desc $ \w -> do
		present <- liftIO $ dbPresent
		ensureProperty w $ cleanupprop present
	  where
		desc = "database " ++ dbname ++ " does not exist"

	cleanupprop :: Bool -> Property UnixLike
	cleanupprop True = cmdProperty "mysqladmin" ["drop", "-f", dbname]
		`assume` MadeChange
	cleanupprop False = doNothing

	-- Is database present?
	dbPresent :: IO Bool
	dbPresent = (== trueResult) <$> readProcess "mysql" ["-BNre", sql]
	  where
		sql = "show databases like '" ++ dbname ++ "'"
		trueResult = dbname ++ "\n"

-- Create an user and make sure he has grants on the specific database but no
-- other grant.
userGrantedOnDatabase
	:: IsContext c
	=> User
	-> Database
	-> [Privilege]
	-> c
	-> RevertableProperty (HasInfo + DebianLike) DebianLike
userGrantedOnDatabase (User username) (Database dbname) privs context =
	setup <!> cleanup
  where
	setup :: Property (HasInfo + DebianLike)
	setup = setup' `requires` installed

	cleanup :: Property DebianLike
	cleanup = cleanup' `requires` installed

	-- Check user grants and reset them if needed.
	setup' :: Property (HasInfo + UnixLike)
	setup' = withPrivData (Password username) context $ \getpassword ->
		property' desc $ \w -> getpassword $ \priv -> do
			hash <- liftIO $ hashPassword $ privDataVal priv
			curGrants <- liftIO $ getUserGrants
			let match = curGrants == (userGrants hash)
			ensureProperty w $ setupprop match hash
	  where
		desc = "user " ++ username ++ " granted on database " ++ dbname

	setupprop :: Bool -> String -> Property UnixLike
	setupprop True _ = doNothing
	setupprop False hash = cmdProperty "mysql" ["-BNre", sql]
		`assume` MadeChange
	  where
		sql = "DROP USER IF EXISTS " ++ quser ++ ";"
			++ "GRANT " ++ privList ++ " ON " ++ privLevel
			++ " TO " ++ quser
			++ " IDENTIFIED BY PASSWORD '" ++ hash ++ "'"

	-- Test for user existance and drop it if needed.
	cleanup' :: Property UnixLike
	cleanup' =
		property' desc $ \w -> do
			curGrants <- liftIO $ getUserGrants
			ensureProperty w $ cleanupprop $ curGrants /= ""
	  where
		desc = "user " ++ username ++ " does not exist"

	cleanupprop :: Bool -> Property UnixLike
	cleanupprop False = doNothing
	cleanupprop True = cmdProperty "mysql" ["-BNre", sql]
		`assume` MadeChange
	  where
		sql = "DROP USER " ++ quser

	-- Request MySQL to hash a password.
	hashPassword :: String -> IO String
	hashPassword password =
		Data.List.head . lines <$>
			writeReadProcessEnv "mysql" ["-BNr"] Nothing
				(Just writer) Nothing
	  where
		writer h = hPutStr h sql
		sql = "select password('" ++ password ++ "')"

	-- Request current user grants from MySQL.
	getUserGrants :: IO String
	getUserGrants =
		catchDefaultIO "" $ readProcess "mysql" ["-BNre", sql]
	  where
		sql = "show grants for " ++ quser

	-- Expected user grants as output by MySQL.
	userGrants :: String -> String
	userGrants hash =
		"GRANT USAGE ON *.* TO " ++ quser
		++ " IDENTIFIED BY PASSWORD '" ++ hash ++ "'\n"
		++ "GRANT " ++ privList ++ " ON " ++ privLevel
		++ " TO " ++ quser ++ "\n"

	-- Privilege level for database access.
	privLevel = "`" ++ dbname ++ "`.*"
	-- Privilege list as output by MySQL.
	privList = intercalate ", " $ map show $ nub $ sort privs
	-- Qualified user name.
	quser = "'" ++ username ++ "'@'localhost'"