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MinIO Haskell SDK API Reference

Initialize MinIO Client object.

MinIO - for public Play server

minioPlayCI :: ConnectInfo
minioPlayCI

AWS S3

awsCI :: ConnectInfo
awsCI { connectAccesskey = "your-access-key"
      , connectSecretkey = "your-secret-key"
      }
Bucket operations Object Operations Presigned Operations
listBuckets getObject presignedGetObjectUrl
makeBucket putObject presignedPutObjectUrl
removeBucket fGetObject presignedPostPolicy
listObjects fPutObject
listObjectsV1 copyObject
listIncompleteUploads removeObject
bucketExists selectObjectContent

1. Connecting and running operations on the storage service

The Haskell MinIO SDK provides high-level functionality to perform operations on a MinIO server or any AWS S3-like API compatible storage service.

The ConnectInfo type

The ConnectInfo record-type contains connection information for a particular server. It is recommended to construct the ConnectInfo value using one of the several smart constructors provided by the library, documented in the following subsections.

The library automatically discovers the region of a bucket by default. This is especially useful with AWS, where buckets may be in different regions. When performing an upload, download or other operation, the library requests the service for the location of a bucket and caches it for subsequent requests.

awsCI :: ConnectInfo

awsCI is a value that provides connection information for AWS S3. Credentials can be supplied by overriding a couple of fields like so:

awsConn = awsCI {
    connectAccessKey = "my-AWS-access-key"
  , connectSecretKey = "my-AWS-secret-key"
  }

awsWithRegionCI :: Region -> Bool -> ConnectInfo

This constructor allows to specify the initial region and a Boolean to enable/disable the automatic region discovery behaviour.

The parameters in the expression awsWithRegion region autoDiscover are:

Parameter Type Description
region Region (alias for Text) The region to connect to by default for all requests.
autoDiscover Bool If True, region discovery will be enabled. If False, discovery is disabled, and all requests go the given region only.

minioPlayCI :: ConnectInfo

This constructor provides connection and authentication information to connect to the public MinIO Play server at https://play.min.io:9000/.

minioCI :: Text -> Int -> Bool -> ConnectInfo

Use to connect to a MinIO server.

The parameters in the expression minioCI host port isSecure are:

Parameter Type Description
host Text Hostname of the MinIO or other S3-API compatible server
port Int Port number to connect to
isSecure Bool Does the server use HTTPS?

The ConnectInfo fields and Default instance

The following table shows the fields in the ConnectInfo record-type:

Field Type Description
connectHost Text Host name of the server. Defaults to localhost.
connectPort Int Port number on which the server listens. Defaults to 9000.
connectAccessKey Text Access key to use in authentication. Defaults to minio.
connectSecretkey Text Secret key to use in authentication. Defaults to minio123.
connectIsSecure Bool Specifies if the server used TLS. Defaults to False
connectRegion Region (alias for Text) Specifies the region to use. Defaults to 'us-east-1'
connectAutoDiscoverRegion Bool Specifies if the library should automatically discover the region of a bucket. Defaults to True

The def value of type ConnectInfo has all the above default values.

The Minio Monad

This monad provides the required environment to perform requests against a MinIO or other S3 API compatible server. It uses the connection information from the ConnectInfo value provided to it. It performs connection pooling, bucket location caching, error handling and resource clean-up actions.

The runMinio function performs the provided action in the Minio monad and returns a IO (Either MinioErr a) value:

{-# Language OverloadedStrings #-}

import Network.Minio

main :: IO ()
main = do
  result <- runMinio def $ do
    buckets <- listBuckets
    return $ length buckets

  case result of
    Left e -> putStrLn $ "Failed operation with error: " ++ show e
    Right n -> putStrLn $ show n ++ " bucket(s) found."

The above performs a listBuckets operation and returns the number of buckets in the server. If there were any errors, they will be returned as values of type MinioErr as a Left value.

2. Bucket operations

listBuckets :: Minio [BucketInfo]

Lists buckets.

Return Value

Return type Description
Minio [BucketInfo] List of buckets

BucketInfo record type

Field Type Description
biName Bucket (alias of Text) Name of the bucket
biCreationDate UTCTime Creation time of the bucket

makeBucket :: Bucket -> Maybe Region -> Minio ()

Create a new bucket. If the region is not specified, the region specified by ConnectInfo is used.

Parameters

In the expression makeBucket bucketName region the arguments are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket
region Maybe Region Region where the bucket is to be created. If not specified, default to the region in ConnectInfo.

Example

{-# Language OverloadedStrings #-}

main :: IO ()
main = do
    res <- runMinio minioPlayCI $ do
        makeBucket bucketName (Just "us-east-1")
    case res of
        Left err -> putStrLn $ "Failed to make bucket: " ++ (show res)
        Right _ -> putStrLn $ "makeBucket successful."

removeBucket :: Bucket -> Minio ()

Remove a bucket. The bucket must be empty or an error will be thrown.

Parameters

In the expression removeBucket bucketName the arguments are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket

Example

{-# Language OverloadedStrings #-}

main :: IO ()
main = do
    res <- runMinio minioPlayCI $ do
        removeBucket "mybucket"

    case res of
        Left err -> putStrLn $ "Failed to remove bucket: " ++ (show res)
        Right _ -> putStrLn $ "removeBucket successful."

listObjects :: Bucket -> Maybe Text -> Bool -> C.ConduitM () ObjectInfo Minio ()

List objects in the given bucket, implements version 2 of AWS S3 API.

Parameters

In the expression listObjects bucketName prefix recursive the arguments are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket
prefix Maybe Text Optional prefix that listed objects should have
recursive Bool True indicates recursive style listing and False indicates directory style listing delimited by '/'.

Return Value

Return type Description
C.ConduitM () ObjectInfo Minio () A Conduit Producer of ObjectInfo values corresponding to each object.

ObjectInfo record type

Field Type Description
oiObject Object (alias for Text) Name of object
oiModTime UTCTime Last modified time of the object
oiETag ETag (alias for Text) ETag of the object
oiSize Int64 Size of the object in bytes

Example

{-# LANGUAGE OverloadedStrings #-}
import           Network.Minio

import           Conduit
import           Prelude


-- | The following example uses MinIO play server at
-- https://play.min.io:9000.  The endpoint and associated
-- credentials are provided via the libary constant,
--
-- > minioPlayCI :: ConnectInfo
--

main :: IO ()
main = do
  let
    bucket = "test"

  -- Performs a recursive listing of all objects under bucket "test"
  -- on play.min.io.
  res <- runMinio minioPlayCI $
    runConduit $ listObjects bucket Nothing True .| mapM_C (\v -> (liftIO $ print v))
  print res

listObjectsV1 :: Bucket -> Maybe Text -> Bool -> C.ConduitM () ObjectInfo Minio ()

List objects in the given bucket, implements version 1 of AWS S3 API. This API is provided for legacy S3 compatible object storage endpoints.

Parameters

In the expression listObjectsV1 bucketName prefix recursive the arguments are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket
prefix Maybe Text Optional prefix that listed objects should have
recursive Bool True indicates recursive style listing and False indicates directory style listing delimited by '/'.

Return Value

Return type Description
C.ConduitM () ObjectInfo Minio () A Conduit Producer of ObjectInfo values corresponding to each object.

ObjectInfo record type

Field Type Description
oiObject Object (alias for Text) Name of object
oiModTime UTCTime Last modified time of the object
oiETag ETag (alias for Text) ETag of the object
oiSize Int64 Size of the object in bytes

Example

{-# LANGUAGE OverloadedStrings #-}
import           Network.Minio

import           Conduit
import           Prelude


-- | The following example uses MinIO play server at
-- https://play.min.io:9000.  The endpoint and associated
-- credentials are provided via the libary constant,
--
-- > minioPlayCI :: ConnectInfo
--

main :: IO ()
main = do
  let
    bucket = "test"

  -- Performs a recursive listing of all objects under bucket "test"
  -- on play.min.io.
  res <- runMinio minioPlayCI $
    runConduit $ listObjectsV1 bucket Nothing True .| mapM_C (\v -> (liftIO $ print v))
  print res

listIncompleteUploads :: Bucket -> Maybe Prefix -> Bool -> C.Producer Minio UploadInfo

List incompletely uploaded objects.

Parameters

In the expression listIncompleteUploads bucketName prefix recursive the parameters are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket
prefix Maybe Text Optional prefix that listed objects should have.
recursive Bool True indicates recursive style listing and Talse indicates directory style listing delimited by '/'.

Return Value

Return type Description
C.ConduitM () UploadInfo Minio () A Conduit Producer of UploadInfo values corresponding to each incomplete multipart upload

UploadInfo record type

Field Type Description
uiKey Object Name of incompletely uploaded object
uiUploadId String Upload ID of incompletely uploaded object
uiSize Int64 Size of incompletely uploaded object

Example

{-# LANGUAGE OverloadedStrings #-}
import           Network.Minio

import           Conduit
import           Prelude

-- | The following example uses MinIO play server at
-- https://play.min.io:9000.  The endpoint and associated
-- credentials are provided via the libary constant,
--
-- > minioPlayCI :: ConnectInfo
--

main :: IO ()
main = do
  let
    bucket = "test"

  -- Performs a recursive listing of incomplete uploads under bucket "test"
  -- on a local MinIO server.
  res <- runMinio minioPlayCI $
    runConduit $ listIncompleteUploads bucket Nothing True .| mapM_C (\v -> (liftIO $ print v))
  print res

3. Object operations

getObject :: Bucket -> Object -> GetObjectOptions -> Minio (C.ConduitM () ByteString Minio ())

Get an object from the S3 service, optionally object ranges can be provided as well.

Parameters

In the expression getObject bucketName objectName opts the parameters are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket
objectName Object (alias for Text) Name of the object
opts GetObjectOptions Options for GET requests specifying additional options like If-Match, Range

GetObjectOptions record type

Field Type Description
gooRange Maybe ByteRanges Represents the byte range of object. E.g ByteRangeFromTo 0 9 represents first ten bytes of the object
gooIfMatch Maybe ETag (alias for Text) (Optional) ETag of object should match
gooIfNoneMatch Maybe ETag (alias for Text) (Optional) ETag of object shouldn't match
gooIfUnmodifiedSince Maybe UTCTime (Optional) Time since object wasn't modified
gooIfModifiedSince Maybe UTCTime (Optional) Time since object was modified

Return Value

The return value can be incrementally read to process the contents of the object. |Return type |Description | |:---|:---| | Minio (C.ConduitM () ByteString Minio ()) | A Conduit source of ByteString values. |

Example

{-# LANGUAGE OverloadedStrings #-}
import           Network.Minio

import qualified Data.Conduit        as C
import qualified Data.Conduit.Binary as CB

import           Prelude

-- | The following example uses MinIO play server at
-- https://play.min.io:9000.  The endpoint and associated
-- credentials are provided via the libary constant,
--
-- > minioPlayCI :: ConnectInfo
--

main :: IO ()
main = do
  let
      bucket = "my-bucket"
      object = "my-object"
  res <- runMinio minioPlayCI $ do
    src <- getObject bucket object def
    C.connect src $ CB.sinkFileCautious "/tmp/my-object"

  case res of
    Left e  -> putStrLn $ "getObject failed." ++ (show e)
    Right _ -> putStrLn "getObject succeeded."

putObject :: Bucket -> Object -> C.ConduitM () ByteString Minio () -> Maybe Int64 -> PutObjectOptions -> Minio ()

Uploads an object to a bucket in the service, from the given input byte stream of optionally supplied length. Optionally you can also specify additional metadata for the object.

Parameters

In the expression putObject bucketName objectName inputSrc the parameters are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket
objectName Object (alias for Text) Name of the object
inputSrc C.ConduitM () ByteString Minio () A Conduit producer of ByteString values
size Int64 Provide stream size (optional)
opts PutObjectOptions Optional parameters to provide additional metadata for the object

Example

{-# LANGUAGE OverloadedStrings #-}
import           Network.Minio

import qualified Data.Conduit.Combinators as CC

import           Prelude

-- | The following example uses MinIO play server at
-- https://play.min.io:9000.  The endpoint and associated
-- credentials are provided via the libary constant,
--
-- > minioPlayCI :: ConnectInfo
--

main :: IO ()
main = do
  let
      bucket = "test"
      object = "obj"
      localFile = "/etc/lsb-release"
      kb15 = 15 * 1024

  -- Eg 1. Upload a stream of repeating "a" using putObject with default options.
  res <- runMinio minioPlayCI $
    putObject bucket object (CC.repeat "a") (Just kb15) def
  case res of
    Left e   -> putStrLn $ "putObject failed." ++ show e
    Right () -> putStrLn "putObject succeeded."

fGetObject :: Bucket -> Object -> FilePath -> GetObjectOptions -> Minio ()

Downloads an object from a bucket in the service, to the given file

Parameters

In the expression fGetObject bucketName objectName inputFile the parameters are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket
objectName Object (alias for Text) Name of the object
inputFile FilePath Path to the file to be uploaded
opts GetObjectOptions Options for GET requests specifying additional options like If-Match, Range

GetObjectOptions record type

Field Type Description
gooRange Maybe ByteRanges Represents the byte range of object. E.g ByteRangeFromTo 0 9 represents first ten bytes of the object
gooIfMatch Maybe ETag (alias for Text) (Optional) ETag of object should match
gooIfNoneMatch Maybe ETag (alias for Text) (Optional) ETag of object shouldn't match
gooIfUnmodifiedSince Maybe UTCTime (Optional) Time since object wasn't modified
gooIfModifiedSince Maybe UTCTime (Optional) Time since object was modified
{-# Language OverloadedStrings #-}
import Network.Minio

import Data.Conduit (($$+-))
import Data.Conduit.Binary (sinkLbs)
import Prelude

-- | The following example uses MinIO play server at
-- https://play.min.io:9000.  The endpoint and associated
-- credentials are provided via the libary constant,
--
-- > minioPlayCI :: ConnectInfo
--

main :: IO ()
main = do
  let
      bucket = "my-bucket"
      object = "my-object"
      localFile = "/etc/lsb-release"

  res <- runMinio minioPlayCI $ do
    src <- fGetObject bucket object localFile def
    (src $$+- sinkLbs)

  case res of
    Left e -> putStrLn $ "fGetObject failed." ++ (show e)
    Right _ -> putStrLn "fGetObject succeeded."

fPutObject :: Bucket -> Object -> FilePath -> Minio ()

Uploads an object to a bucket in the service, from the given file

Parameters

In the expression fPutObject bucketName objectName inputFile the parameters are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket
objectName Object (alias for Text) Name of the object
inputFile FilePath Path to the file to be uploaded

Example

{-# Language OverloadedStrings #-}
import Network.Minio
import qualified Data.Conduit.Combinators as CC

main :: IO ()
main = do
  let
    bucket = "mybucket"
    object = "myobject"
    localFile = "/etc/lsb-release"

  res <- runMinio minioPlayCI $ do
           fPutObject bucket object localFile

  case res of
    Left e -> putStrLn $ "Failed to fPutObject " ++ show bucket ++ "/" ++ show object
    Right _ -> putStrLn "fPutObject was successful"

copyObject :: DestinationInfo -> SourceInfo -> Minio ()

Copies content of an object from the service to another

Parameters

In the expression copyObject dstInfo srcInfo the parameters are:

Param Type Description
dstInfo DestinationInfo A value representing properties of the destination object
srcInfo SourceInfo A value representing properties of the source object

SourceInfo record type

Field Type Description
srcBucket Bucket Name of source bucket
srcObject Object Name of source object
srcRange Maybe (Int64, Int64) (Optional) Represents the byte range of source object. (0, 9) represents first ten bytes of source object
srcIfMatch Maybe Text (Optional) ETag source object should match
srcIfNoneMatch Maybe Text (Optional) ETag source object shouldn't match
srcIfUnmodifiedSince Maybe UTCTime (Optional) Time since source object wasn't modified
srcIfModifiedSince Maybe UTCTime (Optional) Time since source object was modified

Destination record type

Field Type Description
dstBucket Bucket Name of destination bucket in server-side copyObject
dstObject Object Name of destination object in server-side copyObject

Example

{-# Language OverloadedStrings #-}
import Network.Minio

main :: IO ()
main = do
  let
    bucket = "mybucket"
    object = "myobject"
    objectCopy = "obj-copy"

  res <- runMinio minioPlayCI $ do
           copyObject def { dstBucket = bucket, dstObject = objectCopy } def { srcBucket = bucket, srcObject = object }

  case res of
    Left e -> putStrLn $ "Failed to copyObject " ++ show bucket ++ show "/" ++ show object
    Right _ -> putStrLn "copyObject was successful"

removeObject :: Bucket -> Object -> Minio ()

Removes an object from the service

Parameters

In the expression removeObject bucketName objectName the parameters are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket
objectName Object (alias for Text) Name of the object

Example

{-# Language OverloadedStrings #-}
import Network.Minio

main :: IO ()
main = do
  let
    bucket = "mybucket"
    object = "myobject"

  res <- runMinio minioPlayCI $ do
           removeObject bucket object

  case res of
    Left e -> putStrLn $ "Failed to remove " ++ show bucket ++ "/" ++ show object
    Right _ -> putStrLn "Removed object successfully"

removeIncompleteUpload :: Bucket -> Object -> Minio ()

Removes an ongoing multipart upload of an object from the service

Parameters

In the expression removeIncompleteUpload bucketName objectName the parameters are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket
objectName Object (alias for Text) Name of the object

Example

{-# Language OverloadedStrings #-}
import Network.Minio

main :: IO ()
main = do
  let
    bucket = "mybucket"
    object = "myobject"

  res <- runMinio minioPlayCI $
           removeIncompleteUpload bucket object

  case res of
    Left _ -> putStrLn $ "Failed to remove " ++ show bucket ++ "/" ++ show object
    Right _ -> putStrLn "Removed incomplete upload successfully"

selectObjectContent :: Bucket -> Object -> SelectRequest -> Minio (ConduitT () EventMessage Minio ())

Removes an ongoing multipart upload of an object from the service

Parameters

In the expression selectObjectContent bucketName objectName selReq the parameters are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket
objectName Object (alias for Text) Name of the object
selReq SelectRequest Select request parameters

SelectRequest record

This record is created using selectRequest. Please refer to the Haddocks for further information.

Return Value

The return value can be used to read individual EventMessages in the response. Please refer to the Haddocks for further information.

Return type Description
Minio (C.conduitT () EventMessage Minio ()) A Conduit source of EventMessage values.

Example

{-# Language OverloadedStrings #-}
import Network.Minio

import qualified Conduit              as C

main :: IO ()
main = do
  let
    bucket = "mybucket"
    object = "myobject"

  res <- runMinio minioPlayCI $ do
    let sr = selectRequest "Select * from s3object"
             defaultCsvInput defaultCsvOutput
    res <- selectObjectContent bucket object sr
    C.runConduit $ res C..| getPayloadBytes C..| C.stdoutC

  case res of
    Left _ -> putStrLn "Failed!"
    Right _ -> putStrLn "Success!"

bucketExists :: Bucket -> Minio Bool

Checks if a bucket exists.

Parameters

In the expression bucketExists bucketName the parameters are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket

4. Presigned operations

presignedGetObjectUrl :: Bucket -> Object -> UrlExpiry -> Query -> RequestHeaders -> Minio ByteString

Generate a URL with authentication signature to GET (download) an object. All extra query parameters and headers passed here will be signed and are required when the generated URL is used. Query parameters could be used to change the response headers sent by the server. Headers can be used to set Etag match conditions among others.

For a list of possible request parameters and headers, please refer to the GET object REST API AWS S3 documentation.

Parameters

In the expression presignedGetObjectUrl bucketName objectName expiry queryParams headers the parameters are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket
objectName Object (alias for Text) Name of the object
expiry UrlExpiry (alias for Int) Url expiry time in seconds
queryParams Query (from package http-types:Network.HTTP.Types) Query parameters to add to the URL
headers RequestHeaders (from package http-types:Network.HTTP.Types Request headers that would be used with the URL

Return Value

Returns the generated URL - it will include authentication information.

Return type Description
ByteString Generated presigned URL

Example

{-# Language OverloadedStrings #-}

import Network.Minio
import qualified Data.ByteString.Char8 as B

main :: IO ()
main = do
  let
    bucket = "mybucket"
    object = "myobject"

  res <- runMinio minioPlayCI $ do
           -- Set a 7 day expiry for the URL
           presignedGetObjectUrl bucket object (7*24*3600) [] []

  -- Print the URL on success.
  putStrLn $ either
    (("Failed to generate URL: " ++) . show)
    B.unpack
    res

presignedPutObjectUrl :: Bucket -> Object -> UrlExpiry -> RequestHeaders -> Minio ByteString

Generate a URL with authentication signature to PUT (upload) an object. Any extra headers if passed, are signed, and so they are required when the URL is used to upload data. This could be used, for example, to set user-metadata on the object.

For a list of possible headers to pass, please refer to the PUT object REST API AWS S3 documentation.

Parameters

In the expression presignedPutObjectUrl bucketName objectName expiry headers the parameters are:

Param Type Description
bucketName Bucket (alias for Text) Name of the bucket
objectName Object (alias for Text) Name of the object
expiry UrlExpiry (alias for Int) Url expiry time in seconds
headers RequestHeaders (from package http-types:Network.HTTP.Types Request headers that would be used with the URL

Return Value

Returns the generated URL - it will include authentication information.

Return type Description
ByteString Generated presigned URL

Example

{-# Language OverloadedStrings #-}

import Network.Minio
import qualified Data.ByteString.Char8 as B

main :: IO ()
main = do
  let
    bucket = "mybucket"
    object = "myobject"

  res <- runMinio minioPlayCI $ do
           -- Set a 7 day expiry for the URL
           presignedPutObjectUrl bucket object (7*24*3600) [] []

  -- Print the URL on success.
  putStrLn $ either
    (("Failed to generate URL: " ++) . show)
    B.unpack
    res

presignedPostPolicy :: PostPolicy -> Minio (ByteString, Map.Map Text ByteString)

Generate a presigned URL and POST policy to upload files via a POST request. This is intended for browser uploads and generates form data that should be submitted in the request.

The PostPolicy argument is created using the newPostPolicy function:

newPostPolicy :: UTCTime -> [PostPolicyCondition] -> Either PostPolicyError PostPolicy

In the expression newPostPolicy expirationTime conditions the parameters are:

Param Type Description
expirationTime UTCTime (from package time:Data.Time.UTCTime) The expiration time for the policy
conditions [PostPolicyConditions] List of conditions to be added to the policy

The policy conditions are created using various helper functions - please refer to the Haddocks for details.

Since conditions are validated by newPostPolicy it returns an Either value.

Return Value

presignedPostPolicy returns a 2-tuple - the generated URL and a map containing the form-data that should be submitted with the request.

Example

{-# Language OverloadedStrings #-}

import Network.Minio

import qualified Data.ByteString       as B
import qualified Data.ByteString.Char8 as Char8
import qualified Data.Map.Strict       as Map
import qualified Data.Text.Encoding    as Enc
import qualified Data.Time             as Time

main :: IO ()
main = do
  now <- Time.getCurrentTime
  let
    bucket = "mybucket"
    object = "myobject"

    -- set an expiration time of 10 days
    expireTime = Time.addUTCTime (3600 * 24 * 10) now

    -- create a policy with expiration time and conditions - since the
    -- conditions are validated, newPostPolicy returns an Either value
    policyE = newPostPolicy expireTime
              [ -- set the object name condition
                ppCondKey "photos/my-object"
                -- set the bucket name condition
              , ppCondBucket "my-bucket"
                -- set the size range of object as 1B to 10MiB
              , ppCondContentLengthRange 1 (10*1024*1024)
                -- set content type as jpg image
              , ppCondContentType "image/jpeg"
                -- on success set the server response code to 200
              , ppCondSuccessActionStatus 200
              ]

  case policyE of
    Left err -> putStrLn $ show err
    Right policy -> do
      res <- runMinio minioPlayCI $ do
        (url, formData) <- presignedPostPolicy policy

        -- a curl command is output to demonstrate using the generated
        -- URL and form-data
        let
          formFn (k, v) = B.concat ["-F ", Enc.encodeUtf8 k, "=",
                                    "'", v, "'"]
          formOptions = B.intercalate " " $ map formFn $ Map.toList formData


        return $ B.intercalate " " $
          ["curl", formOptions, "-F file=@/tmp/photo.jpg", url]

      case res of
        Left e -> putStrLn $ "post-policy error: " ++ (show e)
        Right cmd -> do
          putStrLn $ "Put a photo at /tmp/photo.jpg and run command:\n"

          -- print the generated curl command
          Char8.putStrLn cmd
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