ldap-scim-bridge (empty) → 0.1

raw patch · 6 files changed

+1331/−0 lines, 6 filesdep +aesondep +aeson-prettydep +base

Dependencies added: aeson, aeson-pretty, base, bytestring, containers, email-validate, hscim, http-client, http-client-tls, http-types, ldap-client, ldap-scim-bridge, network, relude, servant, servant-client, servant-client-core, string-conversions, text, tinylog, yaml

Files

• CHANGELOG.md +15/−0
• LICENSE +661/−0
• README.md +73/−0
• app/Main.hs +3/−0
• ldap-scim-bridge.cabal +116/−0
• src/LdapScimBridge.hs +463/−0

@@ -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

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@@ -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 <config.yaml>+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)

@@ -0,0 +1,3 @@+module Main (main) where++import LdapScimBridge (main)

@@ -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 <mf@zerobuzz.net>+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

@@ -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 <> " <config.yaml>",+              "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