93 lines
3.2 KiB
Haskell
93 lines
3.2 KiB
Haskell
|
-- eidolon -- A simple gallery in Haskell and Yesod
|
||
|
|
-- Copyright (C) 2015 Amedeo Molnár
|
||
|
|
--
|
||
|
|
-- This program is free software: you can redistribute it and/or modify
|
||
|
|
-- it under the terms of the GNU Affero General Public License as published
|
||
|
|
-- by the Free Software Foundation, either version 3 of the License, or
|
||
|
|
-- (at your option) any later version.
|
||
|
|
--
|
||
|
|
-- This program is distributed in the hope that it will be useful,
|
||
|
|
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
-- GNU Affero General Public License for more details.
|
||
|
|
--
|
||
|
|
-- You should have received a copy of the GNU Affero General Public License
|
||
|
|
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
|
||
|
|
module Licence where
|
||
|
|
|
||
|
|
import ClassyPrelude.Yesod
|
||
|
|
import Database.Persist.Sql
|
||
|
|
import Data.Bits (bitSizeMaybe)
|
||
|
|
|
||
|
|
class ShowUrl a where
|
||
|
|
url :: a -> Maybe String
|
||
|
|
|
||
|
|
data Licence
|
||
|
|
= PublicDomain
|
||
|
|
| AllRightsReserved
|
||
|
|
| CC0
|
||
|
|
| CCBy4
|
||
|
|
| CCBySa4
|
||
|
|
| CCByNd4
|
||
|
|
| CCByNc4
|
||
|
|
| CCByNcSa4
|
||
|
|
| CCByNcNd4
|
||
|
|
deriving (Eq, Ord, Bounded)
|
||
|
|
|
||
|
|
instance ShowUrl Licence where
|
||
|
|
url PublicDomain = Nothing
|
||
|
|
url AllRightsReserved = Nothing
|
||
|
|
url CC0 = Just "https://creativecommons.org/publicdomain/zero/1.0/"
|
||
|
|
url CCBy4 = Just "https://creativecommons.org/licenses/by/4.0"
|
||
|
|
url CCBySa4 = Just "https://creativecommons.org/licenses/by-sa/4.0"
|
||
|
|
url CCByNd4 = Just "https://creativecommons.org/licenses/by-nd/4.0"
|
||
|
|
url CCByNc4 = Just "https://creativecommons.org/licenses/by-nc/4.0"
|
||
|
|
url CCByNcSa4 = Just "https://creativecommons.org/licenses/by-nc-sa/4.0"
|
||
|
|
url CCByNcNd4 = Just "https://creativecommons.org/licenses/by-nc-nd/4.0"
|
||
|
|
|
||
|
|
instance Show Licence where
|
||
|
|
show PublicDomain = "Public Domain"
|
||
|
|
show AllRightsReserved = "All rights reserved"
|
||
|
|
show CC0 = "CC0 1.0"
|
||
|
|
show CCBy4 = "CC-BY 4.0 International"
|
||
|
|
show CCBySa4 = "CC-BY-SA 4.0 International"
|
||
|
|
show CCByNd4 = "CC-BY-ND 4.0 International"
|
||
|
|
show CCByNc4 = "CC-BY-NC 4.0 International"
|
||
|
|
show CCByNcSa4 = "CC-BY-NC-SA 4.0 International"
|
||
|
|
show CCByNcNd4 = "CC-BY-NC-ND 4.0 International"
|
||
|
|
|
||
|
|
instance Enum Licence where
|
||
|
|
fromEnum PublicDomain = -2
|
||
|
|
fromEnum AllRightsReserved = -1
|
||
|
|
fromEnum CC0 = 0
|
||
|
|
fromEnum CCBy4 = 1
|
||
|
|
fromEnum CCBySa4 = 2
|
||
|
|
fromEnum CCByNd4 = 3
|
||
|
|
fromEnum CCByNc4 = 4
|
||
|
|
fromEnum CCByNcSa4 = 5
|
||
|
|
fromEnum CCByNcNd4 = 6
|
||
|
|
fromEnum n = error $ "no licence no. for" ++ show n
|
||
|
|
|
||
|
|
toEnum (-2) = PublicDomain
|
||
|
|
toEnum (-1) = AllRightsReserved
|
||
|
|
toEnum 0 = CC0
|
||
|
|
toEnum 1 = CCBy4
|
||
|
|
toEnum 2 = CCBySa4
|
||
|
|
toEnum 3 = CCByNd4
|
||
|
|
toEnum 4 = CCByNc4
|
||
|
|
toEnum 5 = CCByNcSa4
|
||
|
|
toEnum 6 = CCByNcNd4
|
||
|
|
toEnum n = error $ "No licence no. " ++ show n
|
||
|
|
|
||
|
|
instance PersistField Licence where
|
||
|
|
toPersistValue = PersistInt64 . fromIntegral . fromEnum
|
||
|
|
|
||
|
|
fromPersistValue (PersistInt64 i) = Right $ toEnum $ fromIntegral i
|
||
|
|
fromPersistValue _ = Left "Licence is to be read form PersistInt"
|
||
|
|
|
||
|
|
instance PersistFieldSql Licence where
|
||
|
|
sqlType _
|
||
|
|
| Just x <- bitSizeMaybe (0 :: Int), x <= 32 = SqlInt32
|
||
|
|
| otherwise = SqlInt64
|