mirror of
https://github.com/python/cpython.git
synced 2024-12-12 11:23:56 +08:00
cbd987040e
Resource Description Framework, a metadata encoding, and .xsl is for the Extensible Stylesheet Language.)
237 lines
6.9 KiB
Python
237 lines
6.9 KiB
Python
"""Guess the MIME type of a file.
|
|
|
|
This module defines two useful functions:
|
|
|
|
guess_type(url) -- guess the MIME type and encoding of a URL.
|
|
|
|
guess_extension(type) -- guess the extension for a given MIME type.
|
|
|
|
It also contains the following, for tuning the behavior:
|
|
|
|
Data:
|
|
|
|
knownfiles -- list of files to parse
|
|
inited -- flag set when init() has been called
|
|
suffixes_map -- dictionary mapping suffixes to suffixes
|
|
encodings_map -- dictionary mapping suffixes to encodings
|
|
types_map -- dictionary mapping suffixes to types
|
|
|
|
Functions:
|
|
|
|
init([files]) -- parse a list of files, default knownfiles
|
|
read_mime_types(file) -- parse one file, return a dictionary or None
|
|
|
|
"""
|
|
|
|
import string
|
|
import posixpath
|
|
import urllib
|
|
|
|
knownfiles = [
|
|
"/usr/local/etc/httpd/conf/mime.types",
|
|
"/usr/local/lib/netscape/mime.types",
|
|
"/usr/local/etc/httpd/conf/mime.types", # Apache 1.2
|
|
"/usr/local/etc/mime.types", # Apache 1.3
|
|
]
|
|
|
|
inited = 0
|
|
|
|
def guess_type(url):
|
|
"""Guess the type of a file based on its URL.
|
|
|
|
Return value is a tuple (type, encoding) where type is None if the
|
|
type can't be guessed (no or unknown suffix) or a string of the
|
|
form type/subtype, usable for a MIME Content-type header; and
|
|
encoding is None for no encoding or the name of the program used
|
|
to encode (e.g. compress or gzip). The mappings are table
|
|
driven. Encoding suffixes are case sensitive; type suffixes are
|
|
first tried case sensitive, then case insensitive.
|
|
|
|
The suffixes .tgz, .taz and .tz (case sensitive!) are all mapped
|
|
to ".tar.gz". (This is table-driven too, using the dictionary
|
|
suffix_map).
|
|
|
|
"""
|
|
if not inited:
|
|
init()
|
|
scheme, url = urllib.splittype(url)
|
|
if scheme == 'data':
|
|
# syntax of data URLs:
|
|
# dataurl := "data:" [ mediatype ] [ ";base64" ] "," data
|
|
# mediatype := [ type "/" subtype ] *( ";" parameter )
|
|
# data := *urlchar
|
|
# parameter := attribute "=" value
|
|
# type/subtype defaults to "text/plain"
|
|
comma = string.find(url, ',')
|
|
if comma < 0:
|
|
# bad data URL
|
|
return None, None
|
|
semi = string.find(url, ';', 0, comma)
|
|
if semi >= 0:
|
|
type = url[:semi]
|
|
else:
|
|
type = url[:comma]
|
|
if '=' in type or '/' not in type:
|
|
type = 'text/plain'
|
|
return type, None # never compressed, so encoding is None
|
|
base, ext = posixpath.splitext(url)
|
|
while suffix_map.has_key(ext):
|
|
base, ext = posixpath.splitext(base + suffix_map[ext])
|
|
if encodings_map.has_key(ext):
|
|
encoding = encodings_map[ext]
|
|
base, ext = posixpath.splitext(base)
|
|
else:
|
|
encoding = None
|
|
if types_map.has_key(ext):
|
|
return types_map[ext], encoding
|
|
elif types_map.has_key(string.lower(ext)):
|
|
return types_map[string.lower(ext)], encoding
|
|
else:
|
|
return None, encoding
|
|
|
|
def guess_extension(type):
|
|
"""Guess the extension for a file based on its MIME type.
|
|
|
|
Return value is a string giving a filename extension, including the
|
|
leading dot ('.'). The extension is not guaranteed to have been
|
|
associated with any particular data stream, but would be mapped to the
|
|
MIME type `type' by guess_type(). If no extension can be guessed for
|
|
`type', None is returned.
|
|
"""
|
|
global inited
|
|
if not inited:
|
|
init()
|
|
type = string.lower(type)
|
|
for ext, stype in types_map.items():
|
|
if type == stype:
|
|
return ext
|
|
return None
|
|
|
|
def init(files=None):
|
|
global inited
|
|
for file in files or knownfiles:
|
|
s = read_mime_types(file)
|
|
if s:
|
|
for key, value in s.items():
|
|
types_map[key] = value
|
|
inited = 1
|
|
|
|
def read_mime_types(file):
|
|
try:
|
|
f = open(file)
|
|
except IOError:
|
|
return None
|
|
map = {}
|
|
while 1:
|
|
line = f.readline()
|
|
if not line: break
|
|
words = string.split(line)
|
|
for i in range(len(words)):
|
|
if words[i][0] == '#':
|
|
del words[i:]
|
|
break
|
|
if not words: continue
|
|
type, suffixes = words[0], words[1:]
|
|
for suff in suffixes:
|
|
map['.'+suff] = type
|
|
f.close()
|
|
return map
|
|
|
|
suffix_map = {
|
|
'.tgz': '.tar.gz',
|
|
'.taz': '.tar.gz',
|
|
'.tz': '.tar.gz',
|
|
}
|
|
|
|
encodings_map = {
|
|
'.gz': 'gzip',
|
|
'.Z': 'compress',
|
|
}
|
|
|
|
types_map = {
|
|
'.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',
|
|
'.bcpio': 'application/x-bcpio',
|
|
'.bin': 'application/octet-stream',
|
|
'.cdf': 'application/x-netcdf',
|
|
'.cpio': 'application/x-cpio',
|
|
'.csh': 'application/x-csh',
|
|
'.dll': 'application/octet-stream',
|
|
'.dvi': 'application/x-dvi',
|
|
'.exe': 'application/octet-stream',
|
|
'.eps': 'application/postscript',
|
|
'.etx': 'text/x-setext',
|
|
'.gif': 'image/gif',
|
|
'.gtar': 'application/x-gtar',
|
|
'.hdf': 'application/x-hdf',
|
|
'.htm': 'text/html',
|
|
'.html': 'text/html',
|
|
'.ief': 'image/ief',
|
|
'.jpe': 'image/jpeg',
|
|
'.jpeg': 'image/jpeg',
|
|
'.jpg': 'image/jpeg',
|
|
'.latex': 'application/x-latex',
|
|
'.man': 'application/x-troff-man',
|
|
'.me': 'application/x-troff-me',
|
|
'.mif': 'application/x-mif',
|
|
'.mov': 'video/quicktime',
|
|
'.movie': 'video/x-sgi-movie',
|
|
'.mpe': 'video/mpeg',
|
|
'.mpeg': 'video/mpeg',
|
|
'.mpg': 'video/mpeg',
|
|
'.ms': 'application/x-troff-ms',
|
|
'.nc': 'application/x-netcdf',
|
|
'.o': 'application/octet-stream',
|
|
'.obj': 'application/octet-stream',
|
|
'.oda': 'application/oda',
|
|
'.pbm': 'image/x-portable-bitmap',
|
|
'.pdf': 'application/pdf',
|
|
'.pgm': 'image/x-portable-graymap',
|
|
'.pnm': 'image/x-portable-anymap',
|
|
'.png': 'image/png',
|
|
'.ppm': 'image/x-portable-pixmap',
|
|
'.py': 'text/x-python',
|
|
'.pyc': 'application/x-python-code',
|
|
'.ps': 'application/postscript',
|
|
'.qt': 'video/quicktime',
|
|
'.ras': 'image/x-cmu-raster',
|
|
'.rgb': 'image/x-rgb',
|
|
'.rdf': 'application/xml',
|
|
'.roff': 'application/x-troff',
|
|
'.rtf': 'application/rtf',
|
|
'.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',
|
|
'.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',
|
|
'.wav': 'audio/x-wav',
|
|
'.xbm': 'image/x-xbitmap',
|
|
'.xml': 'text/xml',
|
|
'.xsl': 'application/xml',
|
|
'.xpm': 'image/x-xpixmap',
|
|
'.xwd': 'image/x-xwindowdump',
|
|
'.zip': 'application/zip',
|
|
}
|