1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
--------------------------------------------------------------------
-- |
-- Module : Codec.MIME.Type
-- Copyright : (c) 2006-2009, Galois, Inc.
-- License : BSD3
--
-- Maintainer: Sigbjorn Finne <sigbjorn.finne@gmail.com>
-- Stability : provisional
-- Portability: portable
--
--
-- Representing MIME types and values.
--
--------------------------------------------------------------------
module Codec.MIME.Type where
import Data.List ( concatMap, isSuffixOf )
data Type
= Type
{ mimeType :: MIMEType
, mimeParams :: [(String,String)]
} deriving ( Show, Ord, Eq )
-- | The @null@ MIME record type value; currently a @text/plain@.
nullType :: Type
nullType = Type
{ mimeType = Text "plain"
, mimeParams = []
}
showType :: Type -> String
showType t = showMIMEType (mimeType t) ++ showMIMEParams (mimeParams t)
showMIMEParams :: [(String,String)] -> String
showMIMEParams ps = concatMap showP ps
where
showP (a,b) = ';':' ':a ++ '=':'"':b ++ "\""
data MIMEType
= Application SubType
| Audio SubType
| Image SubType
| Message SubType
| Model SubType
| Multipart Multipart
| Text TextType
| Video SubType
| Other String SubType
deriving ( Show, Ord, Eq )
showMIMEType :: MIMEType -> String
showMIMEType t =
case t of
Application s -> "application/"++s
Audio s -> "audio/"++s
Image s -> "image/"++s
Message s -> "message/"++s
Model s -> "model/"++s
Multipart s -> "multipart/"++showMultipart s
Text s -> "text/"++s
Video s -> "video/"++s
Other a b -> a ++ '/':b
-- | a (type, subtype) MIME pair.
data MIMEPair
= MIMEPair String SubType
deriving ( Eq )
showMIMEPair :: MIMEPair -> String
showMIMEPair (MIMEPair a b) = a ++ '/':b
-- | default subtype representation.
type SubType = String
-- | subtype for text content; currently just a string.
type TextType = SubType
subTypeString :: Type -> String
subTypeString t =
case break (=='/') (showMIMEType (mimeType t)) of
(_,"") -> ""
(_,_:bs) -> bs
majTypeString :: Type -> String
majTypeString t =
case break (=='/') (showMIMEType (mimeType t)) of
(as,_) -> as
data Multipart
= Alternative
| Byteranges
| Digest
| Encrypted
| FormData
| Mixed
| Parallel
| Related
| Signed
| Extension String -- ^ e.g., 'x-foo' (i.e., includes the 'x-' bit)
| OtherMulti String -- unrecognized\/uninterpreted.
-- (e.g., appledouble, voice-message, etc.)
deriving ( Show, Ord, Eq )
isXmlBased :: Type -> Bool
isXmlBased t =
case mimeType t of
Multipart{} -> False
_ -> "+xml" `isSuffixOf` subTypeString t
isXmlType :: Type -> Bool
isXmlType t = isXmlBased t ||
case mimeType t of
Application s -> s `elem` xml_media_types
Text s -> s `elem` xml_media_types
_ -> False
where
-- Note: xml-dtd isn't considered an XML type here.
xml_media_types :: [String]
xml_media_types =
[ "xml"
, "xml-external-parsed-entity"
]
showMultipart :: Multipart -> String
showMultipart m =
case m of
Alternative -> "alternative"
Byteranges -> "byteranges"
Digest -> "digest"
Encrypted -> "encrypted"
FormData -> "form-data"
Mixed -> "mixed"
Parallel -> "parallel"
Related -> "related"
Signed -> "signed"
Extension e -> e
OtherMulti e -> e
type Content = String
data MIMEValue = MIMEValue
{ mime_val_type :: Type
, mime_val_disp :: Maybe Disposition
, mime_val_content :: MIMEContent
, mime_val_headers :: [(String,String)]
, mime_val_inc_type :: Bool
} deriving ( Show, Eq )
nullMIMEValue :: MIMEValue
nullMIMEValue = MIMEValue
{ mime_val_type = nullType
, mime_val_disp = Nothing
, mime_val_content = Multi []
, mime_val_headers = []
, mime_val_inc_type = True
}
data MIMEContent
= Single Content
| Multi [MIMEValue]
deriving (Eq,Show)
data Disposition
= Disposition
{ dispType :: DispType
, dispParams :: [DispParam]
} deriving ( Show, Eq )
data DispType
= DispInline
| DispAttachment
| DispFormData
| DispOther String
deriving ( Show, Eq)
data DispParam
= Name String
| Filename String
| CreationDate String
| ModDate String
| ReadDate String
| Size String
| OtherParam String String
deriving ( Show, Eq)
|
