content: #!/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
  