1 module NmcTransform ( seedNmcDom
5 import Prelude hiding (lookup)
6 import Data.ByteString.Lazy (ByteString)
7 import Data.Text.Lazy (splitOn, pack, unpack)
8 import Data.Map.Lazy (empty, lookup, delete, size, singleton
9 , foldrWithKey, insert, insertWith)
10 import Control.Monad (foldM)
11 import Data.Aeson (decode)
12 import Data.Default.Class (def)
16 -- | Perform query and return error string or parsed domain object
18 (String -> IO (Either String ByteString)) -- ^ query operation action
20 -> IO (Either String NmcDom) -- ^ error string or domain
21 queryNmcDom queryOp key = do
24 Left estr -> return $ Left estr
25 Right str -> case decode str :: Maybe NmcDom of
26 Nothing -> return $ Left $ "Unparseable value: " ++ (show str)
27 Just dom -> return $ Right dom
29 -- | Try to fetch "delegate" or "import" object and merge them into the
30 -- base domain. Original "import" element is removed, but newly
31 -- merged data may contain new "import" or "delegate", so the objects
32 -- that are about to be merged are processed recursively until there
33 -- are no more "import" and "deletage" attributes (or the depth gauge
36 (String -> IO (Either String ByteString)) -- ^ query operation action
37 -> Int -- ^ recursion counter
38 -> NmcDom -- ^ base domain
39 -> IO (Either String NmcDom) -- ^ result with merged import
40 mergeIncl queryOp depth base = do
42 mbase = (splitSubdoms . mergeSelf) base
43 base' = mbase {domDelegate = Nothing, domImport = Nothing}
45 if depth <= 0 then return $ Left "Nesting of imports is too deep"
46 else case ((domDelegate mbase), (domImport mbase)) of
47 (Nothing, Nothing ) -> return $ Right base'
48 (Nothing, Just keys) -> foldM mergeIncl1 (Right base') keys
49 (Just key, _ ) -> mergeIncl1 (Right def) key
51 mergeIncl1 (Left err) _ = return $ Left err -- can never happen
52 mergeIncl1 (Right acc) key = do
53 sub <- queryNmcDom queryOp key
55 Left err -> return $ Left err
56 Right sub' -> mergeIncl queryOp (depth - 1) $ sub' `merge` acc
58 -- | If there is an element in the map with key "", merge the contents
59 -- and remove this element. Do this recursively.
60 mergeSelf :: NmcDom -> NmcDom
64 base' = base {domSubmap = removeSelf map}
65 removeSelf Nothing = Nothing
66 removeSelf (Just map) = if size map' == 0 then Nothing else Just map'
67 where map' = delete "" map
72 case lookup "" map' of
74 Just sub -> (mergeSelf sub) `merge` base'
75 -- recursion depth limited by the size of the record
77 -- | Convert map elements of the form "subN...sub2.sub1.dom.bit"
78 -- into nested map and merge it
79 splitSubdoms :: NmcDom -> NmcDom
82 base' = base { domSubmap = Nothing }
84 case domSubmap base of
86 Just sdmap -> (def { domSubmap = Just sdmap' }) `merge` base'
88 sdmap' = foldrWithKey stow empty sdmap
89 stow fqdn sdom acc = insertWith merge fqdn' sdom' acc
92 nest (filter (/= "") (splitOnDots fqdn), sdom)
93 splitOnDots s = map unpack (splitOn (pack ".") (pack s))
94 nest ([], v) = (fqdn, v) -- can split result be empty?
95 nest ([k], v) = (k, v)
97 nest (ks, def { domSubmap = Just (singleton k v) })
99 -- | transfer some elements of `base` into `sub`, notably TLSA
100 propagate :: NmcDom -> NmcDom -> NmcDom
101 propagate base sub = sub -- FIXME implement it
103 -- | Presence of some elements require removal of some others
104 normalizeDom :: NmcDom -> NmcDom
105 normalizeDom dom = foldr id dom [ translateNormalizer
109 nsNormalizer dom = case domNs dom of
111 Just ns -> def { domNs = domNs dom, domEmail = domEmail dom }
112 translateNormalizer dom = case domTranslate dom of
114 Just tr -> dom { domSubmap = Nothing }
116 -- | Merge imports and Selfs and follow the maps tree to get dom
118 (String -> IO (Either String ByteString)) -- ^ query operation action
119 -> [String] -- ^ subdomain chain
120 -> NmcDom -- ^ base domain
121 -> IO (Either String NmcDom) -- ^ fully processed result
122 descendNmcDom queryOp subdom base = do
123 base' <- mergeIncl queryOp 10 base
125 [] -> return $ fmap normalizeDom base'
128 Left err -> return base'
130 case domSubmap base'' of
131 Nothing -> return $ Right def
134 Nothing -> return $ Right def
135 Just sub -> descendNmcDom queryOp ds $ propagate base'' sub
137 -- | Initial NmcDom populated with "import" only, suitable for "descend"
139 String -- ^ domain key (without namespace prefix)
140 -> NmcDom -- ^ resulting seed domain
141 seedNmcDom dn = def { domImport = Just (["d/" ++ dn])}