http-api-data-0.3.7.2: Converting to/from HTTP API data like URL pieces, headers and query parameters.

Safe HaskellNone
LanguageHaskell2010

Web.HttpApiData

Contents

Description

Convert Haskell values to and from HTTP API data such as URL pieces, headers and query parameters.

Synopsis

Examples

Booleans:

>>> toUrlPiece True
"true"
>>> parseUrlPiece "false" :: Either Text Bool
Right False
>>> parseUrlPieces ["true", "false", "undefined"] :: Either Text [Bool]
Left "could not parse: `undefined'"

Numbers:

>>> toQueryParam 45.2
"45.2"
>>> parseQueryParam "452" :: Either Text Int
Right 452
>>> toQueryParams [1..5] :: [Text]
["1","2","3","4","5"]
>>> parseQueryParams ["127", "255"] :: Either Text [Int8]
Left "out of bounds: `255' (should be between -128 and 127)"

Strings:

>>> toHeader "hello"
"hello"
>>> parseHeader "world" :: Either Text String
Right "world"

Calendar day:

>>> toQueryParam (fromGregorian 2015 10 03)
"2015-10-03"
>>> toGregorian <$> parseQueryParam "2016-12-01"
Right (2016,12,1)

Classes

class ToHttpApiData a where Source #

Convert value to HTTP API data.

WARNING: Do not derive this using DeriveAnyClass as the generated instance will loop indefinitely.

Minimal complete definition

toUrlPiece | toQueryParam

Methods

toUrlPiece :: a -> Text Source #

Convert to URL path piece.

toEncodedUrlPiece :: a -> Builder Source #

Convert to a URL path piece, making sure to encode any special chars. The default definition uses encodePathSegmentsRelative, but this may be overriden with a more efficient version.

toHeader :: a -> ByteString Source #

Convert to HTTP header value.

toQueryParam :: a -> Text Source #

Convert to query param value.

Instances

ToHttpApiData Bool Source # 
ToHttpApiData Char Source # 
ToHttpApiData Double Source # 
ToHttpApiData Float Source # 
ToHttpApiData Int Source # 
ToHttpApiData Int8 Source # 
ToHttpApiData Int16 Source # 
ToHttpApiData Int32 Source # 
ToHttpApiData Int64 Source # 
ToHttpApiData Integer Source # 
ToHttpApiData Natural Source # 
ToHttpApiData Ordering Source # 
ToHttpApiData Word Source # 
ToHttpApiData Word8 Source # 
ToHttpApiData Word16 Source # 
ToHttpApiData Word32 Source # 
ToHttpApiData Word64 Source # 
ToHttpApiData () Source #
>>> toUrlPiece ()
"_"
ToHttpApiData Text Source # 
ToHttpApiData Text Source # 
ToHttpApiData String Source # 
ToHttpApiData Void Source # 
ToHttpApiData Version Source #
>>> toUrlPiece (Version [1, 2, 3] [])
"1.2.3"
ToHttpApiData All Source # 
ToHttpApiData Any Source # 
ToHttpApiData ZonedTime Source #
>>> toUrlPiece $ ZonedTime (LocalTime (fromGregorian 2015 10 03) (TimeOfDay 14 55 51.001)) utc
"2015-10-03T14:55:51.001+0000"
ToHttpApiData LocalTime Source #
>>> toUrlPiece $ LocalTime (fromGregorian 2015 10 03) (TimeOfDay 14 55 21.687)
"2015-10-03T14:55:21.687"
ToHttpApiData TimeOfDay Source #
>>> toUrlPiece $ TimeOfDay 14 55 23.1
"14:55:23.1"
ToHttpApiData UTCTime Source #
>>> toUrlPiece $ UTCTime (fromGregorian 2015 10 03) 864.5
"2015-10-03T00:14:24.5Z"
ToHttpApiData NominalDiffTime Source # 
ToHttpApiData Day Source #
>>> toUrlPiece (fromGregorian 2015 10 03)
"2015-10-03"
ToHttpApiData UUID Source # 
ToHttpApiData a => ToHttpApiData (Maybe a) Source #
>>> toUrlPiece (Just "Hello")
"just Hello"
ToHttpApiData a => ToHttpApiData (Dual a) Source # 
ToHttpApiData a => ToHttpApiData (Sum a) Source # 
ToHttpApiData a => ToHttpApiData (Product a) Source # 
ToHttpApiData a => ToHttpApiData (First a) Source # 
ToHttpApiData a => ToHttpApiData (Last a) Source # 
(ToHttpApiData a, ToHttpApiData b) => ToHttpApiData (Either a b) Source #
>>> toUrlPiece (Left "err" :: Either String Int)
"left err"
>>> toUrlPiece (Right 3 :: Either String Int)
"right 3"

class FromHttpApiData a where Source #

Parse value from HTTP API data.

WARNING: Do not derive this using DeriveAnyClass as the generated instance will loop indefinitely.

Minimal complete definition

parseUrlPiece | parseQueryParam

Methods

parseUrlPiece :: Text -> Either Text a Source #

Parse URL path piece.

parseHeader :: ByteString -> Either Text a Source #

Parse HTTP header value.

parseQueryParam :: Text -> Either Text a Source #

Parse query param value.

Instances

FromHttpApiData Bool Source # 
FromHttpApiData Char Source # 
FromHttpApiData Double Source # 
FromHttpApiData Float Source # 
FromHttpApiData Int Source # 
FromHttpApiData Int8 Source # 
FromHttpApiData Int16 Source # 
FromHttpApiData Int32 Source # 
FromHttpApiData Int64 Source # 
FromHttpApiData Integer Source # 
FromHttpApiData Natural Source # 
FromHttpApiData Ordering Source # 
FromHttpApiData Word Source # 
FromHttpApiData Word8 Source # 
FromHttpApiData Word16 Source # 
FromHttpApiData Word32 Source # 
FromHttpApiData Word64 Source # 
FromHttpApiData () Source #
>>> parseUrlPiece "_" :: Either Text ()
Right ()
FromHttpApiData Text Source # 
FromHttpApiData Text Source # 
FromHttpApiData String Source # 
FromHttpApiData Void Source #

Parsing a Void value is always an error, considering Void as a data type with no constructors.

FromHttpApiData Version Source #
>>> showVersion <$> parseUrlPiece "1.2.3"
Right "1.2.3"
FromHttpApiData All Source # 
FromHttpApiData Any Source # 
FromHttpApiData ZonedTime Source #
>>> parseUrlPiece "2015-10-03T14:55:01+0000" :: Either Text ZonedTime
Right 2015-10-03 14:55:01 +0000
>>> parseQueryParam "2016-12-31T01:00:00Z" :: Either Text ZonedTime
Right 2016-12-31 01:00:00 +0000
FromHttpApiData LocalTime Source #
>>> parseUrlPiece "2015-10-03T14:55:01" :: Either Text LocalTime
Right 2015-10-03 14:55:01
FromHttpApiData TimeOfDay Source #
>>> parseUrlPiece "14:55:01.333" :: Either Text TimeOfDay
Right 14:55:01.333
FromHttpApiData UTCTime Source #
>>> parseUrlPiece "2015-10-03T00:14:24Z" :: Either Text UTCTime
Right 2015-10-03 00:14:24 UTC
FromHttpApiData NominalDiffTime Source # 
FromHttpApiData Day Source #
>>> toGregorian <$> parseUrlPiece "2016-12-01"
Right (2016,12,1)
FromHttpApiData UUID Source # 
FromHttpApiData a => FromHttpApiData (Maybe a) Source #
>>> parseUrlPiece "Just 123" :: Either Text (Maybe Int)
Right (Just 123)
FromHttpApiData a => FromHttpApiData (Dual a) Source # 
FromHttpApiData a => FromHttpApiData (Sum a) Source # 
FromHttpApiData a => FromHttpApiData (Product a) Source # 
FromHttpApiData a => FromHttpApiData (First a) Source # 
FromHttpApiData a => FromHttpApiData (Last a) Source # 
FromHttpApiData a => FromHttpApiData (LenientData a) Source # 
(FromHttpApiData a, FromHttpApiData b) => FromHttpApiData (Either a b) Source #
>>> parseUrlPiece "Right 123" :: Either Text (Either String Int)
Right (Right 123)

Maybe parsers

parseUrlPieceMaybe :: FromHttpApiData a => Text -> Maybe a Source #

Parse URL path piece in a Maybe.

>>> parseUrlPieceMaybe "12" :: Maybe Int
Just 12

parseHeaderMaybe :: FromHttpApiData a => ByteString -> Maybe a Source #

Parse HTTP header value in a Maybe.

>>> parseHeaderMaybe "hello" :: Maybe Text
Just "hello"

parseQueryParamMaybe :: FromHttpApiData a => Text -> Maybe a Source #

Parse query param value in a Maybe.

>>> parseQueryParamMaybe "true" :: Maybe Bool
Just True

Prefix parsers

parseUrlPieceWithPrefix :: FromHttpApiData a => Text -> Text -> Either Text a Source #

Case insensitive.

Parse given text case insensitive and then parse the rest of the input using parseUrlPiece.

>>> parseUrlPieceWithPrefix "Just " "just 10" :: Either Text Int
Right 10
>>> parseUrlPieceWithPrefix "Left " "left" :: Either Text Bool
Left "could not parse: `left'"

This can be used to implement FromHttpApiData for single field constructors:

>>> data Foo = Foo Int deriving (Show)
>>> instance FromHttpApiData Foo where parseUrlPiece s = Foo <$> parseUrlPieceWithPrefix "Foo " s
>>> parseUrlPiece "foo 1" :: Either Text Foo
Right (Foo 1)

parseHeaderWithPrefix :: FromHttpApiData a => ByteString -> ByteString -> Either Text a Source #

Parse given bytestring then parse the rest of the input using parseHeader.

data BasicAuthToken = BasicAuthToken Text deriving (Show)

instance FromHttpApiData BasicAuthToken where
  parseHeader h     = BasicAuthToken <$> parseHeaderWithPrefix "Basic " h
  parseQueryParam p = BasicAuthToken <$> parseQueryParam p
>>> parseHeader "Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==" :: Either Text BasicAuthToken
Right (BasicAuthToken "QWxhZGRpbjpvcGVuIHNlc2FtZQ==")

parseQueryParamWithPrefix :: FromHttpApiData a => Text -> Text -> Either Text a Source #

Case insensitive.

Parse given text case insensitive and then parse the rest of the input using parseQueryParam.

>>> parseQueryParamWithPrefix "z" "z10" :: Either Text Int
Right 10

Multiple URL pieces

toUrlPieces :: (Functor t, ToHttpApiData a) => t a -> t Text Source #

Convert multiple values to a list of URL pieces.

>>> toUrlPieces [1, 2, 3] :: [Text]
["1","2","3"]

parseUrlPieces :: (Traversable t, FromHttpApiData a) => t Text -> Either Text (t a) Source #

Parse multiple URL pieces.

>>> parseUrlPieces ["true", "false"] :: Either Text [Bool]
Right [True,False]
>>> parseUrlPieces ["123", "hello", "world"] :: Either Text [Int]
Left "could not parse: `hello' (input does not start with a digit)"

Multiple query params

toQueryParams :: (Functor t, ToHttpApiData a) => t a -> t Text Source #

Convert multiple values to a list of query parameter values.

>>> toQueryParams [fromGregorian 2015 10 03, fromGregorian 2015 12 01] :: [Text]
["2015-10-03","2015-12-01"]

parseQueryParams :: (Traversable t, FromHttpApiData a) => t Text -> Either Text (t a) Source #

Parse multiple query parameters.

>>> parseQueryParams ["1", "2", "3"] :: Either Text [Int]
Right [1,2,3]
>>> parseQueryParams ["64", "128", "256"] :: Either Text [Word8]
Left "out of bounds: `256' (should be between 0 and 255)"

Parsers for Bounded Enums

parseBoundedUrlPiece :: (ToHttpApiData a, Bounded a, Enum a) => Text -> Either Text a Source #

Case insensitive.

Parse values case insensitively based on ToHttpApiData instance. Uses toUrlPiece to get possible values.

parseBoundedQueryParam :: (ToHttpApiData a, Bounded a, Enum a) => Text -> Either Text a Source #

Case insensitive.

Parse values case insensitively based on ToHttpApiData instance. Uses toQueryParam to get possible values.

parseBoundedHeader :: (ToHttpApiData a, Bounded a, Enum a) => ByteString -> Either Text a Source #

Parse values based on ToHttpApiData instance. Uses toHeader to get possible values.

parseBoundedEnumOf :: (Bounded a, Enum a) => (a -> Text) -> Text -> Either Text a Source #

Parse values based on a precalculated mapping of their Text representation.

>>> parseBoundedEnumOf toUrlPiece "true" :: Either Text Bool
Right True

For case sensitive parser see parseBoundedEnumOfI.

parseBoundedEnumOfI :: (Bounded a, Enum a) => (a -> Text) -> Text -> Either Text a Source #

Case insensitive.

Parse values case insensitively based on a precalculated mapping of their Text representations.

>>> parseBoundedEnumOfI toUrlPiece "FALSE" :: Either Text Bool
Right False

For case sensitive parser see parseBoundedEnumOf.

parseBoundedTextData :: (Show a, Bounded a, Enum a) => Text -> Either Text a Source #

Case insensitive.

Parse values case insensitively based on Show instance.

>>> parseBoundedTextData "true" :: Either Text Bool
Right True
>>> parseBoundedTextData "FALSE" :: Either Text Bool
Right False

This can be used as a default implementation for enumeration types:

>>> data MyData = Foo | Bar | Baz deriving (Show, Bounded, Enum)
>>> instance FromHttpApiData MyData where parseUrlPiece = parseBoundedTextData
>>> parseUrlPiece "foo" :: Either Text MyData
Right Foo

Lenient data

newtype LenientData a Source #

Lenient parameters. FromHttpApiData combinators always return Right.

Since: 0.3.5

Constructors

LenientData 

Instances

Functor LenientData Source # 

Methods

fmap :: (a -> b) -> LenientData a -> LenientData b #

(<$) :: a -> LenientData b -> LenientData a #

Foldable LenientData Source # 

Methods

fold :: Monoid m => LenientData m -> m #

foldMap :: Monoid m => (a -> m) -> LenientData a -> m #

foldr :: (a -> b -> b) -> b -> LenientData a -> b #

foldr' :: (a -> b -> b) -> b -> LenientData a -> b #

foldl :: (b -> a -> b) -> b -> LenientData a -> b #

foldl' :: (b -> a -> b) -> b -> LenientData a -> b #

foldr1 :: (a -> a -> a) -> LenientData a -> a #

foldl1 :: (a -> a -> a) -> LenientData a -> a #

toList :: LenientData a -> [a] #

null :: LenientData a -> Bool #

length :: LenientData a -> Int #

elem :: Eq a => a -> LenientData a -> Bool #

maximum :: Ord a => LenientData a -> a #

minimum :: Ord a => LenientData a -> a #

sum :: Num a => LenientData a -> a #

product :: Num a => LenientData a -> a #

Traversable LenientData Source # 

Methods

traverse :: Applicative f => (a -> f b) -> LenientData a -> f (LenientData b) #

sequenceA :: Applicative f => LenientData (f a) -> f (LenientData a) #

mapM :: Monad m => (a -> m b) -> LenientData a -> m (LenientData b) #

sequence :: Monad m => LenientData (m a) -> m (LenientData a) #

Eq a => Eq (LenientData a) Source # 
Data a => Data (LenientData a) Source # 

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> LenientData a -> c (LenientData a) #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (LenientData a) #

toConstr :: LenientData a -> Constr #

dataTypeOf :: LenientData a -> DataType #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c (LenientData a)) #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (LenientData a)) #

gmapT :: (forall b. Data b => b -> b) -> LenientData a -> LenientData a #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> LenientData a -> r #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> LenientData a -> r #

gmapQ :: (forall d. Data d => d -> u) -> LenientData a -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> LenientData a -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> LenientData a -> m (LenientData a) #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> LenientData a -> m (LenientData a) #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> LenientData a -> m (LenientData a) #

Ord a => Ord (LenientData a) Source # 
Read a => Read (LenientData a) Source # 
Show a => Show (LenientData a) Source # 
FromHttpApiData a => FromHttpApiData (LenientData a) Source # 

Other helpers

showTextData :: Show a => a -> Text Source #

Lower case.

Convert to URL piece using Show instance. The result is always lower cased.

>>> showTextData True
"true"

This can be used as a default implementation for enumeration types:

>>> data MyData = Foo | Bar | Baz deriving (Show)
>>> instance ToHttpApiData MyData where toUrlPiece = showTextData
>>> toUrlPiece Foo
"foo"

readTextData :: Read a => Text -> Either Text a Source #

Parse URL piece using Read instance.

Use for types which do not involve letters:

>>> readTextData "1991-06-02" :: Either Text Day
Right 1991-06-02

This parser is case sensitive and will not match showTextData in presence of letters:

>>> readTextData (showTextData True) :: Either Text Bool
Left "could not parse: `true'"

See parseBoundedTextData.