{-# LANGUAGE DeriveDataTypeable, DeriveGeneric #-}

module Text.Email.Parser
    ( addrSpec
    , localPart
    , domainPart
    , EmailAddress
    , unsafeEmailAddress
    , toByteString
    )
where

import           Control.Applicative
import           Control.Monad (guard, void, when)
import           Data.Attoparsec.ByteString.Char8
import           Data.ByteString (ByteString)
import qualified Data.ByteString.Char8 as BS
import           Data.Data (Data, Typeable)
import           GHC.Generics (Generic)
import qualified Text.Read as Read

-- | Represents an email address.
data EmailAddress = EmailAddress ByteString ByteString
    deriving (EmailAddress -> EmailAddress -> Bool
(EmailAddress -> EmailAddress -> Bool)
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-- | Creates an email address without validating it.
--   You should only use this when reading data from
--   somewhere it has already been validated (e.g. a
--   database).
unsafeEmailAddress :: ByteString -> ByteString -> EmailAddress
unsafeEmailAddress :: ByteString -> ByteString -> EmailAddress
unsafeEmailAddress = ByteString -> ByteString -> EmailAddress
EmailAddress

instance Show EmailAddress where
    show :: EmailAddress -> String
show = ByteString -> String
forall a. Show a => a -> String
show (ByteString -> String)
-> (EmailAddress -> ByteString) -> EmailAddress -> String
forall b c a. (b -> c) -> (a -> b) -> a -> c
. EmailAddress -> ByteString
toByteString

instance Read EmailAddress where
    readListPrec :: ReadPrec [EmailAddress]
readListPrec = ReadPrec [EmailAddress]
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Read.readListPrecDefault
    readPrec :: ReadPrec EmailAddress
readPrec = ReadPrec EmailAddress -> ReadPrec EmailAddress
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a)

-- | Converts an email address back to a ByteString
toByteString :: EmailAddress -> ByteString
toByteString :: EmailAddress -> ByteString
toByteString (EmailAddress ByteString
l ByteString
d) = [ByteString] -> ByteString
BS.concat [ByteString
l, Char -> ByteString
BS.singleton Char
'@', ByteString
d]

-- | Extracts the local part of an email address.
localPart :: EmailAddress -> ByteString
localPart :: EmailAddress -> ByteString
localPart (EmailAddress ByteString
l ByteString
_) = ByteString
l

-- | Extracts the domain part of an email address.
domainPart :: EmailAddress -> ByteString
domainPart :: EmailAddress -> ByteString
domainPart (EmailAddress ByteString
_ ByteString
d) = ByteString
d

-- | A parser for email addresses.
addrSpec :: Parser EmailAddress
addrSpec :: Parser EmailAddress
addrSpec = do
    ByteString
l <- Parser ByteString
local

    -- Maximum length of local-part is 64, per RFC3696
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64) (String -> Parser ByteString ()
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forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"local-part of email is too long (more than 64 octets)")

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_ <- Char -> Parser Char
char Char
'@' Parser Char -> String -> Parser Char
forall i a. Parser i a -> String -> Parser i a
<?> String
"at sign"
    ByteString
d <- Parser ByteString
domain

    -- Maximum length is 254, per Erratum 1690 on RFC3696
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254) (String -> Parser ByteString ()
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fail String
"email address is too long (more than 254 octets)")

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forall a. a -> Parser ByteString a
forall (m :: * -> *) a. Monad m => a -> m a
return (ByteString -> ByteString -> EmailAddress
unsafeEmailAddress ByteString
l ByteString
d)

local :: Parser ByteString
local :: Parser ByteString
local = Parser ByteString
dottedAtoms

domain :: Parser ByteString
domain :: Parser ByteString
domain = Parser ByteString
domainName Parser ByteString -> Parser ByteString -> Parser ByteString
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forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> Parser ByteString
domainLiteral

domainName :: Parser ByteString
domainName :: Parser ByteString
domainName = do
    ByteString
parsedDomain <- ByteString -> [ByteString] -> ByteString
BS.intercalate (Char -> ByteString
BS.singleton Char
'.') ([ByteString] -> ByteString)
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domainLabel Parser ByteString -> Parser Char -> Parser ByteString [ByteString]
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char Char
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char Char
'.')

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<= Int
253)
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forall a. a -> Parser ByteString a
forall (m :: * -> *) a. Monad m => a -> m a
return ByteString
parsedDomain

domainLabel :: Parser ByteString
domainLabel :: Parser ByteString
domainLabel = do
    ByteString
content <- Parser ByteString (Maybe ())
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skipWhile Char -> Bool
isAlphaNumHyphen))

    -- Per RFC1035:
    -- label must be no greater than 63 chars and cannot end with '-'
    -- (we already enforced that it does not start with '-')
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BS.last ByteString
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/= Char
'-')
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forall a. a -> Parser ByteString a
forall (m :: * -> *) a. Monad m => a -> m a
return ByteString
content

alphaNum :: Parser Char
alphaNum :: Parser Char
alphaNum = (Char -> Bool) -> Parser Char
satisfy Char -> Bool
isAlphaNum

isAlphaNumHyphen :: Char -> Bool
isAlphaNumHyphen :: Char -> Bool
isAlphaNumHyphen Char
x = Char -> Bool
isDigit Char
x Bool -> Bool -> Bool
|| Char -> Bool
isAlpha_ascii Char
x Bool -> Bool -> Bool
|| Char
x Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
'-'

dottedAtoms :: Parser ByteString
dottedAtoms :: Parser ByteString
dottedAtoms = ByteString -> [ByteString] -> ByteString
BS.intercalate (Char -> ByteString
BS.singleton Char
'.') ([ByteString] -> ByteString)
-> Parser ByteString [ByteString] -> Parser ByteString
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forall (f :: * -> *) a s. Alternative f => f a -> f s -> f [a]
`sepBy1` Char -> Parser Char
char Char
'.'

atom :: Parser ByteString
atom :: Parser ByteString
atom = (Char -> Bool) -> Parser ByteString
takeWhile1 Char -> Bool
isAtomText

isAtomText :: Char -> Bool
isAtomText :: Char -> Bool
isAtomText Char
x = Char -> Bool
isAlphaNum Char
x Bool -> Bool -> Bool
|| String -> Char -> Bool
inClass String
"!#$%&'*+/=?^_`{|}~-" Char
x

domainLiteral :: Parser ByteString
domainLiteral :: Parser ByteString
domainLiteral =
    (Char -> ByteString -> ByteString
BS.cons Char
'[' (ByteString -> ByteString)
-> ([ByteString] -> ByteString) -> [ByteString] -> ByteString
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (ByteString -> Char -> ByteString)
-> Char -> ByteString -> ByteString
forall a b c. (a -> b -> c) -> b -> a -> c
flip ByteString -> Char -> ByteString
BS.snoc Char
']' (ByteString -> ByteString)
-> ([ByteString] -> ByteString) -> [ByteString] -> ByteString
forall b c a. (b -> c) -> (a -> b) -> a -> c
. [ByteString] -> ByteString
BS.concat) ([ByteString] -> ByteString)
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forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$>
        Parser Char
-> Parser Char
-> Parser ByteString [ByteString]
-> Parser ByteString [ByteString]
forall (f :: * -> *) l r a.
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f l -> f r -> f a -> f a
between (Parser ByteString () -> Parser ByteString (Maybe ())
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optional Parser ByteString ()
cfws Parser ByteString (Maybe ()) -> Parser Char -> Parser Char
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*> Char -> Parser Char
char Char
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char Char
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cfws)
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many (Parser ByteString () -> Parser ByteString (Maybe ())
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fws Parser ByteString (Maybe ())
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>> (Char -> Bool) -> Parser ByteString
takeWhile1 Char -> Bool
isDomainText) Parser ByteString [ByteString]
-> Parser ByteString (Maybe ()) -> Parser ByteString [ByteString]
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optional Parser ByteString ()
fws)

isDomainText :: Char -> Bool
isDomainText :: Char -> Bool
isDomainText Char
x = String -> Char -> Bool
inClass String
"\33-\90\94-\126" Char
x Bool -> Bool -> Bool
|| Char -> Bool
isObsNoWsCtl Char
x

quotedString :: Parser ByteString
quotedString :: Parser ByteString
quotedString =
    (Char -> ByteString -> ByteString
BS.cons Char
'"' (ByteString -> ByteString)
-> ([ByteString] -> ByteString) -> [ByteString] -> ByteString
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (ByteString -> Char -> ByteString)
-> Char -> ByteString -> ByteString
forall a b c. (a -> b -> c) -> b -> a -> c
flip ByteString -> Char -> ByteString
BS.snoc Char
'"' (ByteString -> ByteString)
-> ([ByteString] -> ByteString) -> [ByteString] -> ByteString
forall b c a. (b -> c) -> (a -> b) -> a -> c
. [ByteString] -> ByteString
BS.concat) ([ByteString] -> ByteString)
-> Parser ByteString [ByteString] -> Parser ByteString
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$>
        Parser Char
-> Parser ByteString [ByteString] -> Parser ByteString [ByteString]
forall (f :: * -> *) lr a. Applicative f => f lr -> f a -> f a
between1 (Char -> Parser Char
char Char
'"')
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forall a. Parser ByteString a -> Parser ByteString [a]
forall (f :: * -> *) a. Alternative f => f a -> f [a]
many (Parser ByteString () -> Parser ByteString (Maybe ())
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optional Parser ByteString ()
fws Parser ByteString (Maybe ())
-> Parser ByteString -> Parser ByteString
forall a b.
Parser ByteString a -> Parser ByteString b -> Parser ByteString b
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> Parser ByteString
quotedContent) Parser ByteString [ByteString]
-> Parser ByteString (Maybe ()) -> Parser ByteString [ByteString]
forall a b.
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forall (f :: * -> *) a b. Applicative f => f a -> f b -> f a
<* Parser ByteString () -> Parser ByteString (Maybe ())
forall (f :: * -> *) a. Alternative f => f a -> f (Maybe a)
optional Parser ByteString ()
fws)

quotedContent :: Parser ByteString
quotedContent :: Parser ByteString
quotedContent = (Char -> Bool) -> Parser ByteString
takeWhile1 Char -> Bool
isQuotedText Parser ByteString -> Parser ByteString -> Parser ByteString
forall a.
Parser ByteString a -> Parser ByteString a -> Parser ByteString a
forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> Parser ByteString
quotedPair

isQuotedText :: Char -> Bool
isQuotedText :: Char -> Bool
isQuotedText Char
x = String -> Char -> Bool
inClass String
"\33\35-\91\93-\126" Char
x Bool -> Bool -> Bool
|| Char -> Bool
isObsNoWsCtl Char
x

quotedPair :: Parser ByteString
quotedPair :: Parser ByteString
quotedPair = (Char -> ByteString -> ByteString
BS.cons Char
'\\' (ByteString -> ByteString)
-> (Char -> ByteString) -> Char -> ByteString
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Char -> ByteString
BS.singleton) (Char -> ByteString) -> Parser Char -> Parser ByteString
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> (Char -> Parser Char
char Char
'\\' Parser Char -> Parser Char -> Parser Char
forall a b.
Parser ByteString a -> Parser ByteString b -> Parser ByteString b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> (Parser Char
vchar Parser Char -> Parser Char -> Parser Char
forall a.
Parser ByteString a -> Parser ByteString a -> Parser ByteString a
forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> Parser Char
wsp Parser Char -> Parser Char -> Parser Char
forall a.
Parser ByteString a -> Parser ByteString a -> Parser ByteString a
forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> Parser Char
lf Parser Char -> Parser Char -> Parser Char
forall a.
Parser ByteString a -> Parser ByteString a -> Parser ByteString a
forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> Parser Char
cr Parser Char -> Parser Char -> Parser Char
forall a.
Parser ByteString a -> Parser ByteString a -> Parser ByteString a
forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> Parser Char
obsNoWsCtl Parser Char -> Parser Char -> Parser Char
forall a.
Parser ByteString a -> Parser ByteString a -> Parser ByteString a
forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> Parser Char
nullChar))

cfws :: Parser ()
cfws :: Parser ByteString ()
cfws = Parser ByteString () -> Parser ByteString ()
forall (f :: * -> *) a. Alternative f => f a -> f ()
skipMany (Parser ByteString ()
comment Parser ByteString ()
-> Parser ByteString () -> Parser ByteString ()
forall a.
Parser ByteString a -> Parser ByteString a -> Parser ByteString a
forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> Parser ByteString ()
fws)

fws :: Parser ()
fws :: Parser ByteString ()
fws = Parser ByteString (Maybe ()) -> Parser ByteString ()
forall (f :: * -> *) a. Functor f => f a -> f ()
void (Parser ByteString ()
wsp1 Parser ByteString ()
-> Parser ByteString (Maybe ()) -> Parser ByteString (Maybe ())
forall a b.
Parser ByteString a -> Parser ByteString b -> Parser ByteString b
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> Parser ByteString () -> Parser ByteString (Maybe ())
forall (f :: * -> *) a. Alternative f => f a -> f (Maybe a)
optional (Parser ByteString ()
crlf Parser ByteString ()
-> Parser ByteString () -> Parser ByteString ()
forall a b.
Parser ByteString a -> Parser ByteString b -> Parser ByteString b
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> Parser ByteString ()
wsp1)) Parser ByteString ()
-> Parser ByteString () -> Parser ByteString ()
forall a.
Parser ByteString a -> Parser ByteString a -> Parser ByteString a
forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> (Parser ByteString () -> Parser ByteString ()
forall (f :: * -> *) a. Alternative f => f a -> f ()
skipMany1 (Parser ByteString ()
crlf Parser ByteString ()
-> Parser ByteString () -> Parser ByteString ()
forall a b.
Parser ByteString a -> Parser ByteString b -> Parser ByteString b
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> Parser ByteString ()
wsp1))

between :: Applicative f => f l -> f r -> f a -> f a
between :: forall (f :: * -> *) l r a.
Applicative f =>
f l -> f r -> f a -> f a
between f l
l f r
r f a
x = f l
l f l -> f a -> f a
forall a b. f a -> f b -> f b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> f a
x f a -> f r -> f a
forall a b. f a -> f b -> f a
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f a
<* f r
r

between1 :: Applicative f => f lr -> f a -> f a
between1 :: forall (f :: * -> *) lr a. Applicative f => f lr -> f a -> f a
between1 f lr
lr f a
x = f lr
lr f lr -> f a -> f a
forall a b. f a -> f b -> f b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> f a
x f a -> f lr -> f a
forall a b. f a -> f b -> f a
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f a
<* f lr
lr

comment :: Parser ()
comment :: Parser ByteString ()
comment = Parser Char
-> Parser Char -> Parser ByteString () -> Parser ByteString ()
forall (f :: * -> *) l r a.
Applicative f =>
f l -> f r -> f a -> f a
between (Char -> Parser Char
char Char
'(') (Char -> Parser Char
char Char
')') (Parser ByteString () -> Parser ByteString ())
-> Parser ByteString () -> Parser ByteString ()
forall a b. (a -> b) -> a -> b
$ Parser ByteString () -> Parser ByteString ()
forall (f :: * -> *) a. Alternative f => f a -> f ()
skipMany (Parser ByteString () -> Parser ByteString ()
forall (f :: * -> *) a. Functor f => f a -> f ()
void Parser ByteString ()
commentContent Parser ByteString ()
-> Parser ByteString () -> Parser ByteString ()
forall a.
Parser ByteString a -> Parser ByteString a -> Parser ByteString a
forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> Parser ByteString ()
fws)

commentContent :: Parser ()
commentContent :: Parser ByteString ()
commentContent = (Char -> Bool) -> Parser ByteString ()
skipWhile1 Char -> Bool
isCommentText Parser ByteString ()
-> Parser ByteString () -> Parser ByteString ()
forall a.
Parser ByteString a -> Parser ByteString a -> Parser ByteString a
forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> Parser ByteString -> Parser ByteString ()
forall (f :: * -> *) a. Functor f => f a -> f ()
void Parser ByteString
quotedPair Parser ByteString ()
-> Parser ByteString () -> Parser ByteString ()
forall a.
Parser ByteString a -> Parser ByteString a -> Parser ByteString a
forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> Parser ByteString ()
comment

isCommentText :: Char -> Bool
isCommentText :: Char -> Bool
isCommentText Char
x = String -> Char -> Bool
inClass String
"\33-\39\42-\91\93-\126" Char
x Bool -> Bool -> Bool
|| Char -> Bool
isObsNoWsCtl Char
x

nullChar :: Parser Char
nullChar :: Parser Char
nullChar = Char -> Parser Char
char Char
'\0'

skipWhile1 :: (Char -> Bool) -> Parser()
skipWhile1 :: (Char -> Bool) -> Parser ByteString ()
skipWhile1 Char -> Bool
x = (Char -> Bool) -> Parser Char
satisfy Char -> Bool
x Parser Char -> Parser ByteString () -> Parser ByteString ()
forall a b.
Parser ByteString a -> Parser ByteString b -> Parser ByteString b
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> (Char -> Bool) -> Parser ByteString ()
skipWhile Char -> Bool
x

wsp1 :: Parser ()
wsp1 :: Parser ByteString ()
wsp1 = (Char -> Bool) -> Parser ByteString ()
skipWhile1 Char -> Bool
isWsp

wsp :: Parser Char
wsp :: Parser Char
wsp = (Char -> Bool) -> Parser Char
satisfy Char -> Bool
isWsp

isWsp :: Char -> Bool
isWsp :: Char -> Bool
isWsp Char
x = Char
x Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
' ' Bool -> Bool -> Bool
|| Char
x Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
'\t'

isAlphaNum :: Char -> Bool
isAlphaNum :: Char -> Bool
isAlphaNum Char
x = Char -> Bool
isDigit Char
x Bool -> Bool -> Bool
|| Char -> Bool
isAlpha_ascii Char
x

cr :: Parser Char
cr :: Parser Char
cr = Char -> Parser Char
char Char
'\r'

lf :: Parser Char
lf :: Parser Char
lf = Char -> Parser Char
char Char
'\n'

crlf :: Parser ()
crlf :: Parser ByteString ()
crlf = Parser Char -> Parser ByteString ()
forall (f :: * -> *) a. Functor f => f a -> f ()
void (Parser Char -> Parser ByteString ())
-> Parser Char -> Parser ByteString ()
forall a b. (a -> b) -> a -> b
$ Parser Char
cr Parser Char -> Parser Char -> Parser Char
forall a b.
Parser ByteString a -> Parser ByteString b -> Parser ByteString b
forall (m :: * -> *) a b. Monad m => m a -> m b -> m b
>> Parser Char
lf

isVchar :: Char -> Bool
isVchar :: Char -> Bool
isVchar = String -> Char -> Bool
inClass String
"\x21-\x7e"

vchar :: Parser Char
vchar :: Parser Char
vchar = (Char -> Bool) -> Parser Char
satisfy Char -> Bool
isVchar

isObsNoWsCtl :: Char -> Bool
isObsNoWsCtl :: Char -> Bool
isObsNoWsCtl = String -> Char -> Bool
inClass String
"\1-\8\11-\12\14-\31\127"

obsNoWsCtl :: Parser Char
obsNoWsCtl :: Parser Char
obsNoWsCtl = (Char -> Bool) -> Parser Char
satisfy Char -> Bool
isObsNoWsCtl