Network.HTTP.Client.MultipartFormData

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

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

import Data.Text.Encoding as TE

import Control.Monad

main = void $ withManager defaultManagerSettings $ \m -> do
    req1 <- parseRequest "http://random-cat-photo.net/cat.jpg"
    res <- httpLbs req1 m
    req2 <- parseRequest "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

A single part of a multipart message.

Instances

Show Part

Defined in Network.HTTP.Client.MultipartFormData

Methods

showsPrec :: Int -> Part -> ShowS

show :: Part -> String

showList :: [Part] -> ShowS

partName :: Part -> Text

Name of the corresponding <input>

partFilename :: Part -> Maybe String

A file name, if this is an attached file

partContentType :: Part -> Maybe MimeType

Content type

partHeaders :: Part -> [Header]

List of additional headers

partGetBody :: Part -> IO RequestBody

Action in m which returns the body of a message.

Constructing parts

partBS

Arguments

:: Text

Name of the corresponding <input>.

-> ByteString

The body for this Part.

-> Part

Make a Part whose content is a strict ByteString.

The Part does not have a file name or content type associated with it.

partLBS

Arguments

:: Text

Name of the corresponding <input>.

-> ByteString

The body for this Part.

-> Part

Make a Part whose content is a lazy ByteString.

The Part does not have a file name or content type associated with it.

partFile

Arguments

:: Text

Name of the corresponding <input>.

-> FilePath

The name of the local file to upload.

-> Part

Make a Part from a file.

The entire file will reside in memory at once. If you want constant memory usage, use partFileSource.

The FilePath supplied will be used as the file name of the Part. If you do not want to reveal this name to the server, you must remove it prior to uploading.

The Part does not have a content type associated with it.

partFileSource

Arguments

:: Text

Name of the corresponding <input>.

-> FilePath

The name of the local file to upload.

-> Part

Stream a Part from a file.

The FilePath supplied will be used as the file name of the Part. If you do not want to reveal this name to the server, you must remove it prior to uploading.

The Part does not have a content type associated with it.

partFileSourceChunked :: Text -> FilePath -> Part

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.

The FilePath supplied will be used as the file name of the Part. If you do not want to reveal this name to the server, you must remove it prior to uploading.

The Part does not have a content type associated with it.

partFileRequestBody

Arguments

:: Text

Name of the corresponding <input>.

-> FilePath

File name to supply to the server.

-> RequestBody

Data to upload.

-> Part

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

The Part does not have a content type associated with it.

partFileRequestBodyM

Arguments

:: Text

Name of the corresponding <input>.

-> FilePath

File name to supply to the server.

-> IO RequestBody

Action that will supply data to upload.

-> Part

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

The Part does not have a content type associated with it.

Headers

addPartHeaders :: Part -> [Header] -> Part

Add a list of additional headers to this Part.

Building form data

formDataBody :: MonadIO m => [Part] -> Request -> m Request

Add form data to the Request.

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

formDataBodyWithBoundary :: ByteString -> [Part] -> Request -> IO Request

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

Arguments

:: ByteString

Boundary between parts.

-> [Part]

-> IO RequestBody

Combine the Parts to form multipart/form-data body

renderPart

Arguments

:: ByteString

Boundary between parts.

-> Part

-> IO RequestBody