minio-hs-1.6.0: examples/PresignedPutObject.hs

#!/usr/bin/env stack
-- stack --resolver lts-14.11 runghc --package minio-hs

--
-- MinIO Haskell SDK, (C) 2017, 2018 MinIO, Inc.
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
--     http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
{-# LANGUAGE OverloadedStrings #-}

import qualified Data.ByteString.Char8 as B
import Data.CaseInsensitive (original)
import Network.Minio

-- | The following example uses minio's play server at
-- https://play.min.io.  The endpoint and associated
-- credentials are provided via the libary constant,
--
-- > minioPlayCI :: ConnectInfo
main :: IO ()
main = do
  let -- Use headers to set user-metadata - note that this header will
      -- need to be set when the URL is used to make an upload.
      headers =
        [ ( "x-amz-meta-url-creator",
            "minio-hs-presigned-put-example"
          )
        ]
  res <- runMinio minioPlayCI $ do
    -- generate a URL with 7 days expiry time
    presignedPutObjectUrl "my-bucket" "my-object" (7 * 24 * 3600) headers

  case res of
    Left e -> putStrLn $ "presignedPutObject URL failed." ++ show e
    Right url -> do
      -- We generate a curl command to demonstrate usage of the signed
      -- URL.
      let hdrOpt (k, v) = B.concat ["-H '", original k, ": ", v, "'"]
          curlCmd =
            B.intercalate " " $
              ["curl "]
                ++ map hdrOpt headers
                ++ ["-T /tmp/myfile", B.concat ["'", url, "'"]]

      putStrLn $
        "The following curl command would use the presigned "
          ++ "URL to upload the file at \"/tmp/myfile\":"
      B.putStrLn curlCmd