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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
|
{-# LANGUAGE OverloadedStrings #-}
{-
Copyright (C) 2011 John MacFarlane <jgm@berkeley.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- |
Module : Text.Pandoc.Offline
Copyright : Copyright (C) 2011 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Functions for converting an HTML file into one that can be viewed
offline, by incorporating linked images, CSS, and scripts into
the HTML using data URIs.
-}
module Text.Pandoc.Offline ( offline ) where
import Text.HTML.TagSoup
import Network.URI (isAbsoluteURI, parseURI, escapeURIString)
import Network.HTTP
import Data.ByteString.Base64
import qualified Data.ByteString.Char8 as B
import Data.ByteString (ByteString)
import Data.ByteString.UTF8 (toString)
import System.FilePath (takeExtension, dropExtension, takeDirectory, (</>))
import Data.Char (toLower, isAscii, isAlphaNum)
import Codec.Compression.GZip as Gzip
import qualified Data.ByteString.Lazy as L
import Text.Pandoc.Shared (findDataFile)
import System.Directory (doesFileExist)
getItem :: String -> IO ByteString
getItem f =
if isAbsoluteURI f
then openURL f
else do
let userDataDir = "." -- TODO writeUserDataDir
exists <- doesFileExist f
if exists
then B.readFile f
else do
res <- findDataFile (Just userDataDir) f
exists' <- doesFileExist res
if exists'
then B.readFile res
else B.readFile f -- will throw error
openURL :: String -> IO ByteString
openURL u = getResponseBody =<< simpleHTTP (getReq u)
where getReq v = case parseURI v of
Nothing -> error $ "Could not parse URI: " ++ v
Just u' -> mkRequest GET u'
mimeTypeFor :: String -> String
mimeTypeFor s = case lookup s mimetypes of
Nothing -> error $ "Could not find mime type for " ++ s
Just x -> x
where mimetypes = [ -- taken from MissingH
(".a", "application/octet-stream"),
(".ai", "application/postscript"),
(".aif", "audio/x-aiff"),
(".aifc", "audio/x-aiff"),
(".aiff", "audio/x-aiff"),
(".au", "audio/basic"),
(".avi", "video/x-msvideo"),
(".bat", "text/plain"),
(".bcpio", "application/x-bcpio"),
(".bin", "application/octet-stream"),
(".bmp", "image/x-ms-bmp"),
(".c", "text/plain"),
(".cdf", "application/x-netcdf"),
(".cpio", "application/x-cpio"),
(".csh", "application/x-csh"),
(".css", "text/css"),
(".dll", "application/octet-stream"),
(".doc", "application/msword"),
(".dot", "application/msword"),
(".dvi", "application/x-dvi"),
(".eml", "message/rfc822"),
(".eps", "application/postscript"),
(".etx", "text/x-setext"),
(".exe", "application/octet-stream"),
(".gif", "image/gif"),
(".gtar", "application/x-gtar"),
(".h", "text/plain"),
(".hdf", "application/x-hdf"),
(".htm", "text/html"),
(".html", "text/html"),
(".ief", "image/ief"),
(".jpe", "image/jpeg"),
(".jpeg", "image/jpeg"),
(".jpg", "image/jpeg"),
(".js", "application/x-javascript"),
(".ksh", "text/plain"),
(".latex", "application/x-latex"),
(".m1v", "video/mpeg"),
(".man", "application/x-troff-man"),
(".me", "application/x-troff-me"),
(".mht", "message/rfc822"),
(".mhtml", "message/rfc822"),
(".mif", "application/x-mif"),
(".mov", "video/quicktime"),
(".movie", "video/x-sgi-movie"),
(".mp2", "audio/mpeg"),
(".mp3", "audio/mpeg"),
(".mpa", "video/mpeg"),
(".mpe", "video/mpeg"),
(".mpeg", "video/mpeg"),
(".mpg", "video/mpeg"),
(".ms", "application/x-troff-ms"),
(".nc", "application/x-netcdf"),
(".nws", "message/rfc822"),
(".o", "application/octet-stream"),
(".obj", "application/octet-stream"),
(".oda", "application/oda"),
(".p12", "application/x-pkcs12"),
(".p7c", "application/pkcs7-mime"),
(".pbm", "image/x-portable-bitmap"),
(".pdf", "application/pdf"),
(".pfx", "application/x-pkcs12"),
(".pgm", "image/x-portable-graymap"),
(".pl", "text/plain"),
(".png", "image/png"),
(".pnm", "image/x-portable-anymap"),
(".pot", "application/vnd.ms-powerpoint"),
(".ppa", "application/vnd.ms-powerpoint"),
(".ppm", "image/x-portable-pixmap"),
(".pps", "application/vnd.ms-powerpoint"),
(".ppt", "application/vnd.ms-powerpoint"),
(".ps", "application/postscript"),
(".pwz", "application/vnd.ms-powerpoint"),
(".py", "text/x-python"),
(".pyc", "application/x-python-code"),
(".pyo", "application/x-python-code"),
(".qt", "video/quicktime"),
(".ra", "audio/x-pn-realaudio"),
(".ram", "application/x-pn-realaudio"),
(".ras", "image/x-cmu-raster"),
(".rdf", "application/xml"),
(".rgb", "image/x-rgb"),
(".roff", "application/x-troff"),
(".rtx", "text/richtext"),
(".sgm", "text/x-sgml"),
(".sgml", "text/x-sgml"),
(".sh", "application/x-sh"),
(".shar", "application/x-shar"),
(".snd", "audio/basic"),
(".so", "application/octet-stream"),
(".src", "application/x-wais-source"),
(".sv4cpio", "application/x-sv4cpio"),
(".sv4crc", "application/x-sv4crc"),
(".swf", "application/x-shockwave-flash"),
(".t", "application/x-troff"),
(".tar", "application/x-tar"),
(".tcl", "application/x-tcl"),
(".tex", "application/x-tex"),
(".texi", "application/x-texinfo"),
(".texinfo", "application/x-texinfo"),
(".tif", "image/tiff"),
(".tiff", "image/tiff"),
(".tr", "application/x-troff"),
(".tsv", "text/tab-separated-values"),
(".txt", "text/plain"),
(".ustar", "application/x-ustar"),
(".vcf", "text/x-vcard"),
(".wav", "audio/x-wav"),
(".wiz", "application/msword"),
(".xbm", "image/x-xbitmap"),
(".xlb", "application/vnd.ms-excel"),
(".xls", "application/vnd.ms-excel"),
(".xml", "text/xml"),
(".xpm", "image/x-xpixmap"),
(".xsl", "application/xml"),
(".xwd", "image/x-xwindowdump"),
(".zip", "application/zip"),
(".jpg", "image/jpg"),
(".mid", "audio/midi"),
(".midi", "audio/midi"),
(".pct", "image/pict"),
(".pic", "image/pict"),
(".pict", "image/pict"),
(".rtf", "application/rtf"),
(".xul", "text/xul")
]
isOk :: Char -> Bool
isOk c = isAscii c && isAlphaNum c
convertTag :: Tag String -> IO (Tag String)
convertTag t@(TagOpen "img" as) =
case fromAttrib "src" t of
[] -> return t
src -> do
(raw, mime) <- getRaw t src
let enc = "data:" ++ mime ++ ";base64," ++ toString (encode raw)
return $ TagOpen "img" (("src",enc) : [(x,y) | (x,y) <- as, x /= "src"])
convertTag t@(TagOpen "script" as) =
case fromAttrib "src" t of
[] -> return t
src -> do
(raw, mime) <- getRaw t src
let enc = "data:" ++ mime ++ "," ++ escapeURIString isOk (toString raw)
return $ TagOpen "script" (("src",enc) : [(x,y) | (x,y) <- as, x /= "src"])
convertTag t@(TagOpen "link" as) =
case fromAttrib "href" t of
[] -> return t
src -> do
(raw, mime) <- getRaw t src
let enc = "data:" ++ mime ++ "," ++ escapeURIString isOk (toString raw)
return $ TagOpen "link" (("href",enc) : [(x,y) | (x,y) <- as, x /= "href"])
convertTag t = return t
cssImports :: FilePath -> ByteString -> IO ByteString
cssImports d orig =
case B.breakSubstring "@import" orig of
(x,y) | B.null y -> return orig
| otherwise -> do
rest <- handleImport d (B.drop 7 y) >>= cssImports d
return $ x `B.append` rest
-- @import url("blah");
-- @import url(blah);
-- @import "blah";
handleImport :: FilePath -> ByteString -> IO ByteString
handleImport d x = fmap (`B.append` rest) (getItem $ d </> url)
where lparenOrQuote c = c == '(' || c == '"'
rparenOrQuote c = c == ')' || c == '"'
url = toString
$ B.takeWhile (not . rparenOrQuote)
$ B.dropWhile lparenOrQuote
$ B.dropWhile (not . lparenOrQuote) x
rest = B.drop 1 $ B.dropWhile (/= ';') x
getRaw :: Tag String -> String -> IO (ByteString, String)
getRaw t src = do
let ext = map toLower $ takeExtension src
let (ext',decomp) = if ext == ".gz"
then (takeExtension $ dropExtension src, B.concat . L.toChunks . Gzip.decompress . L.fromChunks . (:[]))
else (ext, id)
let mime = case fromAttrib "type" t of
[] -> mimeTypeFor ext'
x -> x
raw <- getItem src
result <- if mime == "text/css"
then cssImports (takeDirectory src) $ decomp raw
else return $ decomp raw
return (result, mime)
offline :: String -> IO String
offline inp = do
let tags = parseTags inp
out' <- mapM convertTag tags
return $ renderTagsOptions renderOptions{ optMinimize = (\t -> t == "br"
|| t == "img" || t == "meta" || t == "link" ) } out'
|
