diff --git a/CHANGELOG.md b/CHANGELOG.md new file mode 100644 --- /dev/null +++ b/CHANGELOG.md @@ -0,0 +1,15 @@ +# Changelog + +`ldap-scim-bridge` uses [PVP Versioning][1]. +The changelog is available [on GitHub][2]. + +## 0.1 + +* Working for one non-trivial use-case. See `./examples/wire-server/` + +## 0.0.0.0 + +* Initially created. + +[1]: https://pvp.haskell.org +[2]: https://github.com/fisx/ldap-scim-bridge/releases diff --git a/LICENSE b/LICENSE new file mode 100644 --- /dev/null +++ b/LICENSE @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. diff --git a/README.md b/README.md new file mode 100644 --- /dev/null +++ b/README.md @@ -0,0 +1,73 @@ +## ldap-scim-bridge + +[![GitHub CI](https://github.com/fisx/ldap-scim-bridge/workflows/CI/badge.svg)](https://github.com/fisx/ldap-scim-bridge/actions) +[![Hackage](https://img.shields.io/hackage/v/ldap-scim-bridge.svg?logo=haskell)](https://hackage.haskell.org/package/ldap-scim-bridge) +[![Stackage Lts](http://stackage.org/package/ldap-scim-bridge/badge/lts)](http://stackage.org/lts/package/ldap-scim-bridge) +[![Stackage Nightly](http://stackage.org/package/ldap-scim-bridge/badge/nightly)](http://stackage.org/nightly/package/ldap-scim-bridge) +[![AGPL-3.0-only license](https://img.shields.io/badge/license-AGPL--3.0--only-blue.svg)](LICENSE) + +## this is work in progress. use at your own risk? + +## intro + +This is a small command line tool to pull data from an LDAP server and +push it to a SCIM peer. It supports only fields `externalId`, +`userName`, `emails`, in the `User` schema and no `Group`s. + +If you extend this to other fields, groups, or other use cases and setups, we +would highly appreciate pull requests, tickets, or emails (no matter how half-baked). + +There is a yaml config file that describes both how to reach the LDAP +server (including the desired directory object(s)) and the SCIM peer, +how to map attributes between the two worlds, and anything else that's +needed like log level. + +Every communication is logged to stdout. When called +without arguments, the tool will print out usage info: + +``` +*** Exception: bad number of arguments: [] + +usage: ldap-scim-bridge +see https://github.com/wireapp/ldap-scim-bridge for a sample config. +``` + +See [ldif](./ldif/README.md) for a few sample user records to play with. +A working example can be found in `./examples/wire-server`. + +## future work + +Support more SCIM attributes and extensions. +Specifically, for +[wire-server](https://github.com/wireapp/wire-server), we may want to +add rich profiles: + +``` + { ..., + "urn:wire:scim:schemas:profile:1.0": { + "richInfo": { + "version": 0, + "fields": [ + { + "value": "hair color", + "type": "green" + }, + { + "value": "title", + "type": "galactic overlord" + } + ] + } + }, + "urn:ietf:params:scim:schemas:extension:wire:1.0:User": { + "hair color": "green", + "title": "galactic overlord" + }, + ... + } +``` + +## further reading + +- [https://devconnected.com/how-to-setup-openldap-server-on-debian-10/](https://devconnected.com/how-to-setup-openldap-server-on-debian-10/) +- [https://www.lepide.com/how-to/restore-deleted-objects-in-active-directory.html](https://www.lepide.com/how-to/restore-deleted-objects-in-active-directory.html) diff --git a/app/Main.hs b/app/Main.hs new file mode 100644 --- /dev/null +++ b/app/Main.hs @@ -0,0 +1,3 @@ +module Main (main) where + +import LdapScimBridge (main) diff --git a/ldap-scim-bridge.cabal b/ldap-scim-bridge.cabal new file mode 100644 --- /dev/null +++ b/ldap-scim-bridge.cabal @@ -0,0 +1,116 @@ +cabal-version: 2.4 +name: ldap-scim-bridge +version: 0.1 +synopsis: See README for synopsis +description: See README for description +homepage: https://github.com/fisx/ldap-scim-bridge +bug-reports: https://github.com/fisx/ldap-scim-bridge/issues +license: AGPL-3.0-or-later +license-file: LICENSE +author: Matthias Fischmann +maintainer: Matthias Fischmann +copyright: (c) 2021 wire.com +category: System +build-type: Simple +extra-doc-files: README.md + CHANGELOG.md +tested-with: GHC == 8.8.3 + +source-repository head + type: git + location: https://github.com/fisx/ldap-scim-bridge.git + +common common-options + build-depends: base >=4.13 && <4.15 + , relude + , hscim >=0.3.6 && <0.4 + , ldap-client >=0.4.1 && <0.5 + , network >=3.1.1.1 && <3.2 + , text >=1.2.4.1 && <1.3 + , yaml >=0.11.5.0 && <0.12 + , aeson >=1.4.7.1 && <1.5 + , aeson-pretty >=0.8.8 && <0.9 + , containers >=0.6.2.1 && <0.7 + , bytestring >=0.10.12 && <0.11 + , email-validate >=2.3.2.13 && <2.4 + , string-conversions >=0.4.0.1 && <0.5 + , servant-client >=0.18.3 && <0.19 + , servant-client-core >=0.18.3 && <0.19 + , servant >=0.18.3 && <0.19 + , http-types >=0.12.3 && <0.13 + , string-conversions >=0.4.0.1 && <0.5 + , http-client >=0.7.8 && <0.8 + , http-client-tls >=0.3.5 && <0.4 + , tinylog >=0.15 && <0.16 + + mixins: base hiding (Prelude) + , relude (Relude as Prelude) + + ghc-options: -Wall + -Wcompat + -Widentities + -Wincomplete-uni-patterns + -Wincomplete-record-updates + if impl(ghc >= 8.0) + ghc-options: -Wredundant-constraints + if impl(ghc >= 8.2) + ghc-options: -fhide-source-paths + if impl(ghc >= 8.4) + ghc-options: -Wmissing-export-lists + -Wpartial-fields + if impl(ghc >= 8.8) + ghc-options: -Wmissing-deriving-strategies + + default-language: Haskell2010 + default-extensions: AllowAmbiguousTypes + BangPatterns + ConstraintKinds + DataKinds + DefaultSignatures + DeriveFunctor + DeriveGeneric + DeriveLift + DeriveTraversable + DerivingStrategies + EmptyCase + FlexibleContexts + FlexibleInstances + FunctionalDependencies + GADTs + InstanceSigs + KindSignatures + LambdaCase + MultiParamTypeClasses + MultiWayIf + NamedFieldPuns + OverloadedStrings + PackageImports + PatternSynonyms + PolyKinds + QuasiQuotes + RankNTypes + RecordWildCards + ScopedTypeVariables + StandaloneDeriving + TemplateHaskell + TupleSections + TypeApplications + TypeFamilies + TypeFamilyDependencies + TypeOperators + UndecidableInstances + ViewPatterns + +library + import: common-options + hs-source-dirs: src + exposed-modules: LdapScimBridge + +executable ldap-scim-bridge + import: common-options + hs-source-dirs: app + main-is: Main.hs + build-depends: ldap-scim-bridge + ghc-options: -threaded + -rtsopts + -with-rtsopts=-N diff --git a/src/LdapScimBridge.hs b/src/LdapScimBridge.hs new file mode 100644 --- /dev/null +++ b/src/LdapScimBridge.hs @@ -0,0 +1,463 @@ +{-# LANGUAGE OverloadedStrings #-} +{-# OPTIONS_GHC -Wno-orphans -Wno-missing-export-lists #-} + +module LdapScimBridge where + +import Control.Exception (ErrorCall (ErrorCall), catch, throwIO) +import qualified Data.Aeson as Aeson +import qualified Data.Aeson.Encode.Pretty as Aeson +import qualified Data.ByteString.Char8 as ByteString +import qualified Data.Foldable as Foldable +import qualified Data.List +import qualified Data.Map as Map +import Data.String.Conversions (cs) +import qualified Data.String.Conversions as SC +import qualified Data.Text.Encoding as Text +import qualified Data.Yaml as Yaml +import qualified GHC.Show +import Ldap.Client as Ldap +import qualified Network.HTTP.Client as HTTP +import qualified Network.HTTP.Client.TLS as HTTP +import Servant.API.ContentTypes (NoContent) +import Servant.Client (BaseUrl (..), ClientEnv (..), Scheme (..), mkClientEnv) +import System.Environment (getProgName) +import System.Logger (Level (..)) +import qualified System.Logger as Log +import qualified Text.Email.Validate +import Web.Scim.Class.Auth (AuthData) +import qualified Web.Scim.Class.Auth as AuthClass +import qualified Web.Scim.Class.Group as GroupClass +import qualified Web.Scim.Class.User as ScimClass +import qualified Web.Scim.Client as ScimClient +import qualified Web.Scim.Filter as ScimFilter +import qualified Web.Scim.Schema.Common as ScimCommon +import qualified Web.Scim.Schema.ListResponse as Scim +import qualified Web.Scim.Schema.Meta as Scim +import qualified Web.Scim.Schema.Schema as Scim +import qualified Web.Scim.Schema.User as Scim +import qualified Web.Scim.Schema.User.Email as Scim + +data LdapConf = LdapConf + { -- | eg. @Ldap.Tls (host conf) Ldap.defaultTlsSettings@ + ldapHost :: Host, + -- | usually 389 for plaintext or 636 for TLS. + ldapPort :: PortNumber, + -- | `$ slapcat | grep ^modifiersName`, eg. @Dn "cn=admin,dc=nodomain"@. + ldapDn :: Dn, + ldapPassword :: Password, + ldapSearch :: LdapSearch, + -- | anything from "Data.Text.Encoding". + ldapCodec :: Codec, + ldapDeleteOnAttribute :: Maybe LdapFilterAttr, + ldapDeleteFromDirectory :: Maybe LdapSearch + } + deriving stock (Show) + +data LdapFilterAttr = LdapFilterAttr + { key :: Text, + value :: Text + } + deriving stock (Eq, Show, Generic) + +data LdapSearch = LdapSearch + { -- | `$ slapcat | grep ^dn`, eg. @Dn "dc=nodomain"@. + ldapSearchBase :: Dn, + -- | eg. @"account"@ + ldapSearchObjectClass :: Text + } + deriving stock (Eq, Show) + +data Codec = Utf8 | Latin1 + deriving stock (Eq, Show) + +instance Aeson.FromJSON LdapConf where + parseJSON = Aeson.withObject "LdapConf" $ \obj -> do + ftls :: Bool <- obj Aeson..: "tls" + fhost :: String <- obj Aeson..: "host" + fport :: Int <- obj Aeson..: "port" + fdn :: Text <- obj Aeson..: "dn" + fpassword :: String <- obj Aeson..: "password" + fsearch :: LdapSearch <- obj Aeson..: "search" + fcodec :: Text <- obj Aeson..: "codec" + fdeleteOnAttribute :: Maybe LdapFilterAttr <- obj Aeson..:? "deleteOnAttribute" + fdeleteFromDirectory :: Maybe LdapSearch <- obj Aeson..:? "deleteFromDirectory" + + let vhost :: Host + vhost = case ftls of + True -> Ldap.Tls fhost Ldap.defaultTlsSettings + False -> Ldap.Plain fhost + + vport :: PortNumber + vport = fromIntegral fport + + vcodec <- case fcodec of + "utf8" -> pure Utf8 + "latin1" -> pure Latin1 + bad -> fail $ "unsupported codec: " <> show bad + + pure $ + LdapConf + { ldapHost = vhost, + ldapPort = vport, + ldapDn = Dn fdn, + ldapPassword = Password $ ByteString.pack fpassword, + ldapSearch = fsearch, + ldapCodec = vcodec, + ldapDeleteOnAttribute = fdeleteOnAttribute, + ldapDeleteFromDirectory = fdeleteFromDirectory + } + +instance Aeson.FromJSON LdapFilterAttr where + parseJSON = Aeson.withObject "LdapFilterAttr" $ \obj -> do + LdapFilterAttr + <$> obj Aeson..: "key" + <*> obj Aeson..: "value" + +instance Aeson.FromJSON LdapSearch where + parseJSON = Aeson.withObject "LdapSearch" $ \obj -> do + fbase :: Text <- obj Aeson..: "base" + fobjectClass :: Text <- obj Aeson..: "objectClass" + pure $ LdapSearch (Dn fbase) fobjectClass + +data ScimConf = ScimConf + { scimTls :: Bool, + scimHost :: String, + scimPort :: Int, + scimPath :: String, + scimToken :: Text + } + deriving stock (Eq, Show, Generic) + +instance Aeson.FromJSON ScimConf where + parseJSON = Aeson.withObject "ScimConf" $ \obj -> do + ScimConf + <$> obj Aeson..: "tls" + <*> obj Aeson..: "host" + <*> obj Aeson..: "port" + <*> obj Aeson..: "path" + <*> obj Aeson..: "token" + +data BridgeConf = BridgeConf + { ldapSource :: LdapConf, + scimTarget :: ScimConf, + mapping :: Mapping, + logLevel :: Level + } + deriving stock (Generic) + +instance Aeson.FromJSON Level where + parseJSON "Trace" = pure Trace + parseJSON "Debug" = pure Debug + parseJSON "Info" = pure Info + parseJSON "Warn" = pure Warn + parseJSON "Error" = pure Error + parseJSON "Fatal" = pure Fatal + parseJSON bad = fail $ "unknown Level: " <> show bad + +instance Aeson.FromJSON BridgeConf + +data MappingError + = MissingAttr Text + | WrongNumberOfAttrValues Text String Int + | CouldNotParseEmail Text String + deriving stock (Eq, Show) + +data FieldMapping = FieldMapping + { fieldMappingLabel :: Text, + fieldMappingFun :: + [Text] -> + Either + MappingError + ( Scim.User ScimTag -> + Scim.User ScimTag + ) + } + +instance Show FieldMapping where + show = show . fieldMappingLabel + +data ScimTag + +instance Scim.UserTypes ScimTag where + type UserId ScimTag = Text + type UserExtra ScimTag = Scim.NoUserExtra + supportedSchemas = [Scim.User20] + +instance GroupClass.GroupTypes ScimTag where + type GroupId ScimTag = Text + +instance AuthClass.AuthTypes ScimTag where + type AuthData ScimTag = Text + type AuthInfo ScimTag = () + +-- | Map attribute keys to functions from attribute values to changes to scim records. We'll +-- start off with an empty scim record, and change it based on attributes we find that are +-- listed in the mapping. Mappigns can fail, eg. if there is more than one attribute value +-- for the attribute mapping to externalId. +newtype Mapping = Mapping {fromMapping :: Map Text [FieldMapping]} + deriving stock (Show) + +instance Aeson.FromJSON Mapping where + parseJSON = Aeson.withObject "Mapping" $ \obj -> do + fuserName <- obj Aeson..: "userName" + fexternalId <- obj Aeson..: "externalId" + mfemail <- obj Aeson..:? "email" + + let listToMap :: [(Text, a)] -> Map Text [a] + listToMap = foldl' go mempty + where + go mp (k, b) = Map.alter (Just . maybe [b] (b :)) k mp + + pure . Mapping . listToMap . catMaybes $ + [ Just (fuserName, mapUserName fuserName), + Just (fexternalId, mapExternalId fexternalId), + (\femail -> (femail, mapEmail femail)) <$> mfemail + ] + where + mapUserName :: Text -> FieldMapping + mapUserName ldapFieldName = FieldMapping "userName" $ + \case + [val] -> Right $ \usr -> usr {Scim.userName = val} + bad -> Left $ WrongNumberOfAttrValues ldapFieldName "1" (Prelude.length bad) + + mapExternalId ldapFieldName = FieldMapping "externalId" $ + \case + [val] -> Right $ \usr -> usr {Scim.externalId = Just val} + bad -> Left $ WrongNumberOfAttrValues ldapFieldName "1" (Prelude.length bad) + + mapEmail ldapFieldName = FieldMapping "emails" $ + \case + [] -> Right id + [val] -> case Text.Email.Validate.validate (SC.cs val) of + Right email -> Right $ \usr -> + usr + { Scim.emails = + [Scim.Email Nothing (Scim.EmailAddress2 email) Nothing] + } + Left err -> Left $ CouldNotParseEmail val err + bad -> + Left $ + WrongNumberOfAttrValues + ldapFieldName + "<=1 (with more than one email, which one should be primary?)" + (Prelude.length bad) + +type LdapResult a = IO (Either LdapError a) + +ldapObjectClassFilter :: Text -> Filter +ldapObjectClassFilter = (Attr "objectClass" :=) . cs + +listLdapUsers :: LdapConf -> LdapSearch -> LdapResult [SearchEntry] +listLdapUsers conf searchConf = Ldap.with (ldapHost conf) (ldapPort conf) $ \l -> do + Ldap.bind l (ldapDn conf) (ldapPassword conf) + let fltr = ldapObjectClassFilter . ldapSearchObjectClass $ searchConf + Ldap.search l (ldapSearchBase searchConf) mempty fltr mempty + +type User = Scim.User ScimTag + +type StoredUser = ScimClass.StoredUser ScimTag + +-- | the 'undefined' is ok, the mapping is guaranteed to contain a filler for this, or the +-- mapping parser would have failed. +emptyScimUser :: User +emptyScimUser = + Scim.empty scimSchemas (error "undefined") Scim.NoUserExtra + +scimSchemas :: [Scim.Schema] +scimSchemas = [Scim.User20] + +ldapToScim :: + forall m. + m ~ Either [(SearchEntry, MappingError)] => + BridgeConf -> + SearchEntry -> + m (SearchEntry, User) +ldapToScim conf entry@(SearchEntry _ attrs) = (entry,) <$> Foldable.foldl' go (Right emptyScimUser) attrs + where + codec = case ldapCodec (ldapSource conf) of + Utf8 -> Text.decodeUtf8 + Latin1 -> Text.decodeLatin1 + + go :: m User -> (Attr, [AttrValue]) -> m User + go scimval (Attr key, vals) = case Map.lookup key (fromMapping $ mapping conf) of + Nothing -> scimval + Just fieldMappings -> foldl' (go' vals) scimval fieldMappings + + go' :: [ByteString] -> m User -> FieldMapping -> m User + go' vals scimval (FieldMapping _ f) = case (scimval, f (codec <$> vals)) of + (Right scimusr, Right f') -> Right (f' scimusr) + (Right _, Left err) -> Left [(entry, err)] + (Left errs, Right _) -> Left errs + (Left errs, Left err) -> Left ((entry, err) : errs) + +connectScim :: ScimConf -> IO ClientEnv +connectScim conf = do + let settings = + if scimTls conf + then HTTP.tlsManagerSettings + else HTTP.defaultManagerSettings + manager <- HTTP.newManager settings + let base = BaseUrl Http (scimHost conf) (scimPort conf) (scimPath conf) + pure $ mkClientEnv manager base + +isDeletee :: LdapConf -> SearchEntry -> Bool +isDeletee conf = case ldapDeleteOnAttribute conf of + Nothing -> const False + Just (LdapFilterAttr key value) -> + \(SearchEntry _ attrs) -> + maybe False (cs value `elem`) (Data.List.lookup (Attr key) attrs) + +updateScimPeer :: Logger -> BridgeConf -> IO () +updateScimPeer lgr conf = do + clientEnv <- connectScim (scimTarget conf) + let tok = Just . scimToken . scimTarget $ conf + ldaps :: [SearchEntry] <- + either (throwIO . ErrorCall . show) pure =<< listLdapUsers (ldapSource conf) (ldapSearch (ldapSource conf)) + do + -- put, post + lgr Info "[post/put: started]" + let ldapKeepees = filter (not . isDeletee (ldapSource conf)) ldaps + scims :: [(SearchEntry, User)] <- + mapM (either (throwIO . ErrorCall . show) pure) (ldapToScim conf <$> ldapKeepees) + lgr Debug $ "Pulled the following ldap users for post/put:\n" <> show (fst <$> scims) + lgr Debug . cs $ "Translated to scim:\n" <> Aeson.encodePretty (snd <$> scims) + updateScimPeerPostPut lgr clientEnv tok (snd <$> scims) + lgr Info "[post/put: done]" + do + -- delete + lgr Info "[delete: started]" + let ldapDeleteesAttr = filter (isDeletee (ldapSource conf)) ldaps + ldapDeleteesDirectory :: [SearchEntry] <- case (ldapDeleteFromDirectory (ldapSource conf)) of + Just (searchConf :: LdapSearch) -> + either (throwIO . ErrorCall . show) pure =<< listLdapUsers (ldapSource conf) searchConf + Nothing -> + pure mempty + + scims :: [(SearchEntry, User)] <- + mapM (either (throwIO . ErrorCall . show) pure) (ldapToScim conf <$> (ldapDeleteesAttr <> ldapDeleteesDirectory)) + lgr Debug $ "Pulled the following ldap users for delete:\n" <> show (fst <$> scims) + lgr Debug . cs $ "Translated to scim:\n" <> Aeson.encodePretty (snd <$> scims) + updateScimPeerDelete lgr clientEnv tok (snd <$> scims) + lgr Info "[delete: done]" + +lookupScimByExternalId :: ClientEnv -> Maybe Text -> Scim.User tag -> IO (Maybe StoredUser) +lookupScimByExternalId clientEnv tok scim = do + eid <- maybe (error "impossible") pure $ Scim.externalId scim + let fltr = Just $ filterBy "externalId" eid + mbold :: [StoredUser] <- + ScimClient.getUsers @ScimTag clientEnv tok fltr + <&> Scim.resources + case mbold of + [old] -> pure $ Just old + [] -> pure Nothing + (_ : _ : _) -> error "impossible" -- externalId must be unique in the scope of the scim auth token. + where + filterBy :: Text -> Text -> ScimFilter.Filter + filterBy name value = + ScimFilter.FilterAttrCompare + (ScimFilter.topLevelAttrPath name) + ScimFilter.OpEq + (ScimFilter.ValString value) + +updateScimPeerPostPut :: + Logger -> + ClientEnv -> + Maybe (AuthData ScimTag) -> + [User] -> + IO () +updateScimPeerPostPut lgr clientEnv tok = mapM_ $ \scim -> do + case Scim.externalId scim of + Nothing -> lgr Error $ "scim user without 'externalId' field: " <> show scim + Just eid -> updateScimPeerPostPutStep lgr clientEnv tok scim eid + +updateScimPeerPostPutStep :: + Logger -> + ClientEnv -> + Maybe Text -> + Scim.User ScimTag -> + Text -> + IO () +updateScimPeerPostPutStep lgr clientEnv tok scim eid = do + lookupScimByExternalId clientEnv tok scim >>= \case + Just old -> + if ScimCommon.value (Scim.thing old) == scim + then do + lgr Info $ "unchanged: " <> show eid + else do + lgr Info $ "update: " <> show eid + process $ ScimClient.putUser @ScimTag clientEnv tok (ScimCommon.id (Scim.thing old)) scim + Nothing -> do + lgr Info $ "new user: " <> show eid + process $ ScimClient.postUser clientEnv tok scim + where + process :: IO StoredUser -> IO () + process action = do + result :: Either SomeException StoredUser <- + (Right <$> action) `catch` (pure . Left) + result + & either + (lgr Error . show) + (\new -> lgr Debug $ "UserId: " <> (show . ScimCommon.id . Scim.thing $ new)) + +updateScimPeerDelete :: + Logger -> + ClientEnv -> + Maybe (AuthData ScimTag) -> + [User] -> + IO () +updateScimPeerDelete lgr clientEnv tok = mapM_ $ \scim -> do + lookupScimByExternalId clientEnv tok scim >>= \case + Just old -> do + process (ScimClient.deleteUser @ScimTag clientEnv tok (ScimCommon.id (Scim.thing old))) + `catch` \e@(SomeException _) -> lgr Error $ show e + Nothing -> do + pure () + where + process :: IO NoContent -> IO () + process action = do + result :: Either SomeException NoContent <- + (Right <$> action) `catch` (pure . Left) + result + & either + (lgr Error . show) + (const $ pure ()) + +parseCli :: IO BridgeConf +parseCli = do + usage <- do + progName <- getProgName + let usage :: String -> ErrorCall + usage = ErrorCall . (<> help) + help = + cs . unlines . fmap cs $ + [ "", + "", + "usage: " <> progName <> " ", + "see https://github.com/wireapp/ldap-scim-bridge for a sample config." + ] + pure usage + + getArgs >>= \case + [file] -> do + content <- ByteString.readFile file `catch` \(SomeException err) -> throwIO . usage $ show err + either (throwIO . usage . show) pure $ Yaml.decodeEither' content + bad -> throwIO . usage $ "bad number of arguments: " <> show bad + +type Logger = Level -> Text -> IO () + +mkLogger :: Level -> IO Logger +mkLogger lvl = do + lgr :: Log.Logger <- + Log.defSettings + & Log.setLogLevel lvl + & Log.new + pure $ \msgLvl msgContent -> do + Log.log lgr msgLvl (Log.msg @Text $ show msgContent) + Log.flush lgr + +main :: IO () +main = do + myconf :: BridgeConf <- parseCli + lgr :: Logger <- mkLogger (logLevel myconf) + lgr Debug $ show (mapping myconf) + updateScimPeer lgr myconf