Network.HTTP.Conduit.MultipartFormData

This module handles building multipart/form-data. Example usage:

 {-# LANGUAGE OverloadedStrings #-}
 import Network
 import Network.HTTP.Conduit
 import Network.HTTP.Conduit.MultipartFormData

 import Data.Text.Encoding as TE

 import Control.Monad

 main = withSocketsDo $ withManager $ \m -> do
     req1 <- parseUrl "http://random-cat-photo.net/cat.jpg"
     res <- httpLbs req1 m
     req2 <- parseUrl "http://example.org/~friedrich/blog/addPost.hs"
     flip httpLbs m =<<
         (formDataBody [partBS "title" "Bleaurgh"
                       ,partBS "text" $ TE.encodeUtf8 "矢田矢田矢田矢田矢田"
                       ,partFileSource "file1" "/home/friedrich/Photos/MyLittlePony.jpg"
                       ,partFileRequestBody "file2" "cat.jpg" $ RequestBodyLBS $ responseBody res]
             req2)

Part type

data Part m m'

A single part of a multipart message.

Constructors

Part

Fields

partName :: Text

Name of the corresponding <input>

partFilename :: Maybe String

A file name, if this is an attached file

partContentType :: Maybe MimeType

Content type

partGetBody :: m (RequestBody m')

Action in m which returns the body of a message.

Instances

Show (Part m m')

Constructing parts

partBS :: (Monad m, Monad m') => Text -> ByteString -> Part m m'

partLBS :: (Monad m, Monad m') => Text -> ByteString -> Part m m'

partFile :: (MonadIO m, Monad m') => Text -> FilePath -> Part m m'

Make a Part from a file, the entire file will reside in memory at once. If you want constant memory usage use partFileSource

partFileSource :: (MonadIO m, MonadResource m') => Text -> FilePath -> Part m m'

Stream Part from a file.

partFileSourceChunked :: (Monad m, MonadResource m') => Text -> FilePath -> Part m m'

partFileSourceChunked will read a file and send it in chunks.

Note that not all servers support this. Only use partFileSourceChunked if you know the server you're sending to supports chunked request bodies.

partFileRequestBody :: (Monad m, Monad m') => Text -> FilePath -> RequestBody m' -> Part m m'

Construct a Part from form name, filepath and a RequestBody

 partFileRequestBody "who_calls" "caller.json" $ RequestBodyBS "{\"caller\":\"Jason J Jason\"}"

 -- empty upload form
 partFileRequestBody "file" mempty mempty

partFileRequestBodyM :: Monad m' => Text -> FilePath -> m (RequestBody m') -> Part m m'

Construct a Part from action returning the RequestBody

 partFileRequestBodyM "cat_photo" "haskell-the-cat.jpg" $ do
     size <- fromInteger <$> withBinaryFile "haskell-the-cat.jpg" ReadMode hFileSize
     return $ RequestBodySource size $ CB.sourceFile "haskell-the-cat.jpg" $= CL.map fromByteString

Building form data

formDataBody :: (MonadIO m, Monad m') => [Part m m'] -> Request m' -> m (Request m')

Add form data to the Request.

This sets a new requestBody, adds a content-type request header and changes the method to POST.

formDataBodyPure :: Monad m => ByteString -> [Part Identity m] -> Request m -> Request m

Add form data to request without doing any IO. Your form data should only contain pure parts (partBS, partLBS, partFileRequestBody). You'll have to supply your own boundary (for example one generated by webkitBoundary)

formDataBodyWithBoundary :: (Monad m, Monad m') => ByteString -> [Part m m'] -> Request m' -> m (Request m')

Add form data with supplied boundary

Boundary

webkitBoundary :: IO ByteString

Generate a boundary simillar to those generated by WebKit-based browsers.

webkitBoundaryPure :: RandomGen g => g -> (ByteString, g)

Misc

renderParts :: (Monad m, Monad m') => ByteString -> [Part m m'] -> m (RequestBody m')

Combine the Parts to form multipart/form-data body

renderPart :: (Monad m, Monad m') => ByteString -> Part m m' -> m (RequestBody m')