-- Explicitly disabling due to external code {-# LANGUAGE NoImplicitPrelude #-}

{-# LANGUAGE FlexibleContexts    #-}
{-# LANGUAGE OverloadedStrings   #-}
{-# LANGUAGE RankNTypes          #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE OverloadedStrings   #-}

-- Adapted from `hackage-security-http-client` to use our own

-- `Pantry.HTTP` implementation

module Hackage.Security.Client.Repository.HttpLib.HttpClient (
    httpLib
  ) where

import Control.Exception
import Control.Monad (void)
import Data.ByteString (ByteString)
import Network.URI
import qualified Data.ByteString              as BS
import qualified Data.ByteString.Char8        as BS.C8
import qualified Pantry.HTTP as HTTP

import Hackage.Security.Client hiding (Header)
import Hackage.Security.Client.Repository.HttpLib
import Hackage.Security.Util.Checked

{-------------------------------------------------------------------------------
  Top-level API
-------------------------------------------------------------------------------}

-- | An 'HttpLib' value using the default global manager

httpLib :: HttpLib
httpLib :: HttpLib
httpLib = HttpLib
    { httpGet :: forall a.
Throws SomeRemoteError =>
[HttpRequestHeader]
-> URI -> ([HttpResponseHeader] -> BodyReader -> IO a) -> IO a
httpGet      = forall a.
Throws SomeRemoteError =>
[HttpRequestHeader]
-> URI -> ([HttpResponseHeader] -> BodyReader -> IO a) -> IO a
get
    , httpGetRange :: forall a.
Throws SomeRemoteError =>
[HttpRequestHeader]
-> URI
-> (Int, Int)
-> (HttpStatus -> [HttpResponseHeader] -> BodyReader -> IO a)
-> IO a
httpGetRange = forall a.
Throws SomeRemoteError =>
[HttpRequestHeader]
-> URI
-> (Int, Int)
-> (HttpStatus -> [HttpResponseHeader] -> BodyReader -> IO a)
-> IO a
getRange
    }

{-------------------------------------------------------------------------------
  Individual methods
-------------------------------------------------------------------------------}

get :: Throws SomeRemoteError
    => [HttpRequestHeader] -> URI
    -> ([HttpResponseHeader] -> BodyReader -> IO a)
    -> IO a
get :: forall a.
Throws SomeRemoteError =>
[HttpRequestHeader]
-> URI -> ([HttpResponseHeader] -> BodyReader -> IO a) -> IO a
get [HttpRequestHeader]
reqHeaders URI
uri [HttpResponseHeader] -> BodyReader -> IO a
callback = forall a.
(Throws HttpException => IO a) -> Throws SomeRemoteError => IO a
wrapCustomEx forall a b. (a -> b) -> a -> b
$ do
    -- TODO: setUri fails under certain circumstances; in particular, when

    -- the URI contains URL auth. Not sure if this is a concern.

    Request
request' <- forall (m :: * -> *). MonadThrow m => Request -> URI -> m Request
HTTP.setUri Request
HTTP.defaultRequest URI
uri
    let request :: Request
request = [HttpRequestHeader] -> Request -> Request
setRequestHeaders [HttpRequestHeader]
reqHeaders Request
request'
    forall a. Throws HttpException => IO a -> IO a
checkHttpException forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) a.
MonadUnliftIO m =>
Request -> (Response BodyReader -> m a) -> m a
HTTP.withResponse Request
request forall a b. (a -> b) -> a -> b
$ \Response BodyReader
response -> do
      let br :: BodyReader
br = forall a.
(Throws HttpException => IO a) -> Throws SomeRemoteError => IO a
wrapCustomEx forall a b. (a -> b) -> a -> b
$ forall a. Response a -> a
HTTP.getResponseBody Response BodyReader
response
      [HttpResponseHeader] -> BodyReader -> IO a
callback (forall a. Response a -> [HttpResponseHeader]
getResponseHeaders Response BodyReader
response) BodyReader
br

getRange :: Throws SomeRemoteError
         => [HttpRequestHeader] -> URI -> (Int, Int)
         -> (HttpStatus -> [HttpResponseHeader] -> BodyReader -> IO a)
         -> IO a
getRange :: forall a.
Throws SomeRemoteError =>
[HttpRequestHeader]
-> URI
-> (Int, Int)
-> (HttpStatus -> [HttpResponseHeader] -> BodyReader -> IO a)
-> IO a
getRange [HttpRequestHeader]
reqHeaders URI
uri (Int
from, Int
to) HttpStatus -> [HttpResponseHeader] -> BodyReader -> IO a
callback = forall a.
(Throws HttpException => IO a) -> Throws SomeRemoteError => IO a
wrapCustomEx forall a b. (a -> b) -> a -> b
$ do
    Request
request' <- forall (m :: * -> *). MonadThrow m => Request -> URI -> m Request
HTTP.setUri Request
HTTP.defaultRequest URI
uri
    let request :: Request
request = Int -> Int -> Request -> Request
setRange Int
from Int
to
                forall a b. (a -> b) -> a -> b
$ [HttpRequestHeader] -> Request -> Request
setRequestHeaders [HttpRequestHeader]
reqHeaders Request
request'
    forall a. Throws HttpException => IO a -> IO a
checkHttpException forall a b. (a -> b) -> a -> b
$ forall (m :: * -> *) a.
MonadUnliftIO m =>
Request -> (Response BodyReader -> m a) -> m a
HTTP.withResponse Request
request forall a b. (a -> b) -> a -> b
$ \Response BodyReader
response -> do
      let br :: BodyReader
br = forall a.
(Throws HttpException => IO a) -> Throws SomeRemoteError => IO a
wrapCustomEx forall a b. (a -> b) -> a -> b
$ forall a. Response a -> a
HTTP.getResponseBody Response BodyReader
response
      case () of
         () | forall a. Response a -> Status
HTTP.getResponseStatus Response BodyReader
response forall a. Eq a => a -> a -> Bool
== Status
HTTP.partialContent206 ->
           HttpStatus -> [HttpResponseHeader] -> BodyReader -> IO a
callback HttpStatus
HttpStatus206PartialContent (forall a. Response a -> [HttpResponseHeader]
getResponseHeaders Response BodyReader
response) BodyReader
br
         () | forall a. Response a -> Status
HTTP.getResponseStatus Response BodyReader
response forall a. Eq a => a -> a -> Bool
== Status
HTTP.ok200 ->
           HttpStatus -> [HttpResponseHeader] -> BodyReader -> IO a
callback HttpStatus
HttpStatus200OK (forall a. Response a -> [HttpResponseHeader]
getResponseHeaders Response BodyReader
response) BodyReader
br
         ()
_otherwise ->
           forall e a. (Exception e, Throws e) => e -> IO a
throwChecked forall a b. (a -> b) -> a -> b
$ Request -> HttpExceptionContent -> HttpException
HTTP.HttpExceptionRequest Request
request
                        forall a b. (a -> b) -> a -> b
$ Response () -> ByteString -> HttpExceptionContent
HTTP.StatusCodeException (forall (f :: * -> *) a. Functor f => f a -> f ()
void Response BodyReader
response) ByteString
""

-- | Wrap custom exceptions

--

-- NOTE: The only other exception defined in @http-client@ is @TimeoutTriggered@

-- but it is currently disabled <https://github.com/snoyberg/http-client/issues/116>

wrapCustomEx :: (Throws HTTP.HttpException => IO a)
             -> (Throws SomeRemoteError => IO a)
wrapCustomEx :: forall a.
(Throws HttpException => IO a) -> Throws SomeRemoteError => IO a
wrapCustomEx Throws HttpException => IO a
act = forall e a.
Exception e =>
(e -> IO a) -> (Throws e => IO a) -> IO a
handleChecked (\(HttpException
ex :: HTTP.HttpException) -> forall {e} {a}. Exception e => e -> IO a
go HttpException
ex) Throws HttpException => IO a
act
  where
    go :: e -> IO a
go e
ex = forall e a. (Exception e, Throws e) => e -> IO a
throwChecked (forall e. Exception e => e -> SomeRemoteError
SomeRemoteError e
ex)

checkHttpException :: Throws HTTP.HttpException => IO a -> IO a
checkHttpException :: forall a. Throws HttpException => IO a -> IO a
checkHttpException = forall e a. Exception e => (e -> IO a) -> IO a -> IO a
handle forall a b. (a -> b) -> a -> b
$ \(HttpException
ex :: HTTP.HttpException) ->
                       forall e a. (Exception e, Throws e) => e -> IO a
throwChecked HttpException
ex

{-------------------------------------------------------------------------------
  http-client auxiliary
-------------------------------------------------------------------------------}

hAcceptRanges :: HTTP.HeaderName
hAcceptRanges :: HeaderName
hAcceptRanges = HeaderName
"Accept-Ranges"

hAcceptEncoding :: HTTP.HeaderName
hAcceptEncoding :: HeaderName
hAcceptEncoding = HeaderName
"Accept-Encoding"

setRange :: Int -> Int
         -> HTTP.Request -> HTTP.Request
setRange :: Int -> Int -> Request -> Request
setRange Int
from Int
to =
    HeaderName -> ByteString -> Request -> Request
HTTP.addRequestHeader HeaderName
HTTP.hRange ByteString
rangeHeader
  where
    -- Content-Range header uses inclusive rather than exclusive bounds

    -- See <http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html>

    rangeHeader :: ByteString
rangeHeader = [Char] -> ByteString
BS.C8.pack forall a b. (a -> b) -> a -> b
$ [Char]
"bytes=" forall a. [a] -> [a] -> [a]
++ forall a. Show a => a -> [Char]
show Int
from forall a. [a] -> [a] -> [a]
++ [Char]
"-" forall a. [a] -> [a] -> [a]
++ forall a. Show a => a -> [Char]
show (Int
to forall a. Num a => a -> a -> a
- Int
1)

-- | Set request headers

setRequestHeaders :: [HttpRequestHeader]
                  -> HTTP.Request -> HTTP.Request
setRequestHeaders :: [HttpRequestHeader] -> Request -> Request
setRequestHeaders [HttpRequestHeader]
opts =
    [Header] -> Request -> Request
setRequestHeaders' ([(HeaderName, [ByteString])] -> [HttpRequestHeader] -> [Header]
trOpt [(HeaderName, [ByteString])]
disallowCompressionByDefault [HttpRequestHeader]
opts)
  where
    setRequestHeaders' :: [HTTP.Header] -> HTTP.Request -> HTTP.Request
    setRequestHeaders' :: [Header] -> Request -> Request
setRequestHeaders' = forall (t :: * -> *) a b.
Foldable t =>
(a -> b -> b) -> b -> t a -> b
foldr (\(HeaderName
name, ByteString
val) Request -> Request
f -> Request -> Request
f forall b c a. (b -> c) -> (a -> b) -> a -> c
. HeaderName -> [ByteString] -> Request -> Request
HTTP.setRequestHeader HeaderName
name [ByteString
val]) forall a. a -> a
id

    trOpt :: [(HTTP.HeaderName, [ByteString])]
          -> [HttpRequestHeader]
          -> [HTTP.Header]
    trOpt :: [(HeaderName, [ByteString])] -> [HttpRequestHeader] -> [Header]
trOpt [(HeaderName, [ByteString])]
acc [] =
      forall a b. (a -> b) -> [a] -> [b]
map (HeaderName, [ByteString]) -> Header
finalizeHeader [(HeaderName, [ByteString])]
acc
    trOpt [(HeaderName, [ByteString])]
acc (HttpRequestHeader
HttpRequestMaxAge0:[HttpRequestHeader]
os) =
      [(HeaderName, [ByteString])] -> [HttpRequestHeader] -> [Header]
trOpt (forall a b. Eq a => a -> [b] -> [(a, [b])] -> [(a, [b])]
insert HeaderName
HTTP.hCacheControl [ByteString
"max-age=0"] [(HeaderName, [ByteString])]
acc) [HttpRequestHeader]
os
    trOpt [(HeaderName, [ByteString])]
acc (HttpRequestHeader
HttpRequestNoTransform:[HttpRequestHeader]
os) =
      [(HeaderName, [ByteString])] -> [HttpRequestHeader] -> [Header]
trOpt (forall a b. Eq a => a -> [b] -> [(a, [b])] -> [(a, [b])]
insert HeaderName
HTTP.hCacheControl [ByteString
"no-transform"] [(HeaderName, [ByteString])]
acc) [HttpRequestHeader]
os

    -- disable content compression (potential security issue)

    disallowCompressionByDefault :: [(HTTP.HeaderName, [ByteString])]
    disallowCompressionByDefault :: [(HeaderName, [ByteString])]
disallowCompressionByDefault = [(HeaderName
hAcceptEncoding, [])]

    -- Some headers are comma-separated, others need multiple headers for

    -- multiple options.

    --

    -- TODO: Right we we just comma-separate all of them.

    finalizeHeader :: (HTTP.HeaderName, [ByteString])
                   -> HTTP.Header
    finalizeHeader :: (HeaderName, [ByteString]) -> Header
finalizeHeader (HeaderName
name, [ByteString]
strs) = (HeaderName
name, ByteString -> [ByteString] -> ByteString
BS.intercalate ByteString
", " (forall a. [a] -> [a]
reverse [ByteString]
strs))

    insert :: Eq a => a -> [b] -> [(a, [b])] -> [(a, [b])]
    insert :: forall a b. Eq a => a -> [b] -> [(a, [b])] -> [(a, [b])]
insert a
_ [b]
_ [] = []
    insert a
x [b]
y ((a
k, [b]
v):[(a, [b])]
pairs)
      | a
x forall a. Eq a => a -> a -> Bool
== a
k = (a
k, [b]
v forall a. [a] -> [a] -> [a]
++ [b]
y) forall a. a -> [a] -> [a]
: forall a b. Eq a => a -> [b] -> [(a, [b])] -> [(a, [b])]
insert a
x [b]
y [(a, [b])]
pairs
      | Bool
otherwise = (a
k, [b]
v) forall a. a -> [a] -> [a]
: forall a b. Eq a => a -> [b] -> [(a, [b])] -> [(a, [b])]
insert a
x [b]
y [(a, [b])]
pairs

-- | Extract the response headers

getResponseHeaders :: HTTP.Response a -> [HttpResponseHeader]
getResponseHeaders :: forall a. Response a -> [HttpResponseHeader]
getResponseHeaders Response a
response = forall (t :: * -> *) a. Foldable t => t [a] -> [a]
concat [
      [ HttpResponseHeader
HttpResponseAcceptRangesBytes
      | (HeaderName
hAcceptRanges, ByteString
"bytes") forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` [Header]
headers
      ]
    ]
  where
    headers :: [Header]
headers = forall a. Response a -> [Header]
HTTP.getResponseHeaders Response a
response