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"""Guess the MIME type of a file.
This module defines two useful functions:
guess_type(url, strict=True) -- guess the MIME type and encoding of a URL.
guess_extension(type, strict=True) -- 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
suffix_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 (on Windows, the
default values are taken from the registry)
read_mime_types(file) -- parse one file, return a dictionary or None
"""
try:
from _winapi import _mimetypes_read_windows_registry
except ImportError:
_mimetypes_read_windows_registry = None
try:
import winreg as _winreg
except ImportError:
_winreg = None
__all__ = [
"knownfiles", "inited", "MimeTypes",
"guess_type", "guess_file_type", "guess_all_extensions", "guess_extension",
"add_type", "init", "read_mime_types",
"suffix_map", "encodings_map", "types_map", "common_types"
]
knownfiles = [
"/etc/mime.types",
"/etc/httpd/mime.types", # Mac OS X
"/etc/httpd/conf/mime.types", # Apache
"/etc/apache/mime.types", # Apache 1
"/etc/apache2/mime.types", # Apache 2
"/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 = False
_db = None
class MimeTypes:
"""MIME-types datastore.
This datastore can handle information from mime.types-style files
and supports basic determination of MIME type from a filename or
URL, and can guess a reasonable extension given a MIME type.
"""
def __init__(self, filenames=(), strict=True):
if not inited:
init()
self.encodings_map = _encodings_map_default.copy()
self.suffix_map = _suffix_map_default.copy()
self.types_map = ({}, {}) # dict for (non-strict, strict)
self.types_map_inv = ({}, {})
for (ext, type) in _types_map_default.items():
self.add_type(type, ext, True)
for (ext, type) in _common_types_default.items():
self.add_type(type, ext, False)
for name in filenames:
self.read(name, strict)
def add_type(self, type, ext, strict=True):
"""Add a mapping between a type and an extension.
When the extension is already known, the new
type will replace the old one. When the type
is already known the extension will be added
to the list of known extensions.
Registered lower-case extensions are matched
case-insensitively.
If strict is true, information will be added to
list of standard types, else to the list of non-standard
types.
Valid extensions are empty or start with a '.'.
"""
if ext and not ext.startswith('.'):
raise ValueError(f"Extension {ext!r} must start with '.'")
if not type:
return
self.types_map[strict][ext] = type
exts = self.types_map_inv[strict].setdefault(type, [])
if ext not in exts:
exts.append(ext)
def guess_type(self, url, strict=True):
"""Guess the type of a file which is either a URL or a path-like object.
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.)
Optional 'strict' argument when False adds a bunch of commonly found,
but non-standard types.
"""
# Lazy import to improve module import time
import os
import urllib.parse
# TODO: Deprecate accepting file paths (in particular path-like objects).
url = os.fspath(url)
p = urllib.parse.urlparse(url)
if p.scheme and len(p.scheme) > 1:
scheme = p.scheme
url = p.path
else:
return self.guess_file_type(url, strict=strict)
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 = url.find(',')
if comma < 0:
# bad data URL
return None, None
semi = url.find(';', 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
# Lazy import to improve module import time
import posixpath
return self._guess_file_type(url, strict, posixpath.splitext)
def guess_file_type(self, path, *, strict=True):
"""Guess the type of a file based on its path.
Similar to guess_type(), but takes file path instead of URL.
"""
# Lazy import to improve module import time
import os
path = os.fsdecode(path)
path = os.path.splitdrive(path)[1]
return self._guess_file_type(path, strict, os.path.splitext)
def _guess_file_type(self, path, strict, splitext):
base, ext = splitext(path)
while True:
if ext in self.suffix_map:
suffix = self.suffix_map[ext]
elif (ext_lower := ext.lower()) in self.suffix_map:
suffix = self.suffix_map[ext_lower]
else:
break
base, ext = splitext(base + suffix)
# encodings_map is case sensitive
if ext in self.encodings_map:
encoding = self.encodings_map[ext]
base, ext = splitext(base)
else:
encoding = None
ext_lower = ext.lower()
types_map = self.types_map[True]
if ext in types_map:
return types_map[ext], encoding
if ext_lower in types_map:
return types_map[ext_lower], encoding
elif strict:
return None, encoding
types_map = self.types_map[False]
if ext in types_map:
return types_map[ext], encoding
if ext_lower in types_map:
return types_map[ext_lower], encoding
else:
return None, encoding
def guess_all_extensions(self, type, strict=True):
"""Guess the extensions for a file based on its MIME type.
Return value is a list of strings giving the possible filename
extensions, 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().
Optional 'strict' argument when false adds a bunch of commonly found,
but non-standard types.
"""
type = type.lower()
extensions = list(self.types_map_inv[True].get(type, []))
if not strict:
for ext in self.types_map_inv[False].get(type, []):
if ext not in extensions:
extensions.append(ext)
return extensions
def guess_extension(self, type, strict=True):
"""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.
Optional 'strict' argument when false adds a bunch of commonly found,
but non-standard types.
"""
extensions = self.guess_all_extensions(type, strict)
if not extensions:
return None
return extensions[0]
def read(self, filename, strict=True):
"""
Read a single mime.types-format file, specified by pathname.
If strict is true, information will be added to
list of standard types, else to the list of non-standard
types.
"""
with open(filename, encoding='utf-8', errors='surrogateescape') as fp:
self.readfp(fp, strict)
def readfp(self, fp, strict=True):
"""
Read a single mime.types-format file.
If strict is true, information will be added to
list of standard types, else to the list of non-standard
types.
"""
while line := fp.readline():
words = line.split()
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:
self.add_type(type, '.' + suff, strict)
def read_windows_registry(self, strict=True):
"""
Load the MIME types database from Windows registry.
If strict is true, information will be added to
list of standard types, else to the list of non-standard
types.
"""
if not _mimetypes_read_windows_registry and not _winreg:
return
add_type = self.add_type
if strict:
add_type = lambda type, ext: self.add_type(type, ext, True)
# Accelerated function if it is available
if _mimetypes_read_windows_registry:
_mimetypes_read_windows_registry(add_type)
elif _winreg:
self._read_windows_registry(add_type)
@classmethod
def _read_windows_registry(cls, add_type):
def enum_types(mimedb):
i = 0
while True:
try:
ctype = _winreg.EnumKey(mimedb, i)
except OSError:
break
else:
if '\0' not in ctype:
yield ctype
i += 1
with _winreg.OpenKey(_winreg.HKEY_CLASSES_ROOT, '') as hkcr:
for subkeyname in enum_types(hkcr):
try:
with _winreg.OpenKey(hkcr, subkeyname) as subkey:
# Only check file extensions
if not subkeyname.startswith("."):
continue
# raises OSError if no 'Content Type' value
mimetype, datatype = _winreg.QueryValueEx(
subkey, 'Content Type')
if datatype != _winreg.REG_SZ:
continue
add_type(mimetype, subkeyname)
except OSError:
continue
def guess_type(url, strict=True):
"""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).
Optional 'strict' argument when false adds a bunch of commonly found, but
non-standard types.
"""
if _db is None:
init()
return _db.guess_type(url, strict)
def guess_file_type(path, *, strict=True):
"""Guess the type of a file based on its path.
Similar to guess_type(), but takes file path instead of URL.
"""
if _db is None:
init()
return _db.guess_file_type(path, strict=strict)
def guess_all_extensions(type, strict=True):
"""Guess the extensions for a file based on its MIME type.
Return value is a list of strings giving the possible filename
extensions, 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.
Optional 'strict' argument when false adds a bunch of commonly found,
but non-standard types.
"""
if _db is None:
init()
return _db.guess_all_extensions(type, strict)
def guess_extension(type, strict=True):
"""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.
Optional 'strict' argument when false adds a bunch of commonly found,
but non-standard types.
"""
if _db is None:
init()
return _db.guess_extension(type, strict)
def add_type(type, ext, strict=True):
"""Add a mapping between a type and an extension.
When the extension is already known, the new
type will replace the old one. When the type
is already known the extension will be added
to the list of known extensions.
Registered lower-case extensions are matched
case-insensitively.
If strict is true, information will be added to
list of standard types, else to the list of non-standard
types.
"""
if _db is None:
init()
return _db.add_type(type, ext, strict)
def init(files=None):
global suffix_map, types_map, encodings_map, common_types
global inited, _db
inited = True # so that MimeTypes.__init__() doesn't call us again
if files is None or _db is None:
db = MimeTypes()
# Quick return if not supported
db.read_windows_registry()
if files is None:
files = knownfiles
else:
files = knownfiles + list(files)
else:
db = _db
# Lazy import to improve module import time
import os
for file in files:
if os.path.isfile(file):
db.read(file)
encodings_map = db.encodings_map
suffix_map = db.suffix_map
types_map = db.types_map[True]
common_types = db.types_map[False]
# Make the DB a global variable now that it is fully initialized
_db = db
def read_mime_types(file):
try:
f = open(file, encoding='utf-8', errors='surrogateescape')
except OSError:
return None
with f:
db = MimeTypes()
db.readfp(f, True)
return db.types_map[True]
def _default_mime_types():
global suffix_map, _suffix_map_default
global encodings_map, _encodings_map_default
global types_map, _types_map_default
global common_types, _common_types_default
suffix_map = _suffix_map_default = {
'.svgz': '.svg.gz',
'.tgz': '.tar.gz',
'.taz': '.tar.gz',
'.tz': '.tar.gz',
'.tbz2': '.tar.bz2',
'.txz': '.tar.xz',
}
encodings_map = _encodings_map_default = {
'.gz': 'gzip',
'.Z': 'compress',
'.bz2': 'bzip2',
'.xz': 'xz',
'.br': 'br',
}
# Before adding new types, make sure they are either registered with IANA,
# at https://www.iana.org/assignments/media-types/media-types.xhtml
# or extensions, i.e. using the x- prefix
# If you add to these, please keep them sorted by mime type.
# Make sure the entry with the preferred file extension for a particular mime type
# appears before any others of the same mimetype.
types_map = _types_map_default = {
'.js' : 'text/javascript',
'.mjs' : 'text/javascript',
'.dcm' : 'application/dicom',
'.efi' : 'application/efi',
'.epub' : 'application/epub+zip',
'.gz' : 'application/gzip',
'.json' : 'application/json',
'.webmanifest': 'application/manifest+json',
'.doc' : 'application/msword',
'.dot' : 'application/msword',
'.wiz' : 'application/msword',
'.nq' : 'application/n-quads',
'.nt' : 'application/n-triples',
'.cjs' : 'application/node',
'.bin' : 'application/octet-stream',
'.a' : 'application/octet-stream',
'.o' : 'application/octet-stream',
'.obj' : 'application/octet-stream',
'.so' : 'application/octet-stream',
'.oda' : 'application/oda',
'.ogx' : 'application/ogg',
'.pdf' : 'application/pdf',
'.ai' : 'application/pdf',
'.p7c' : 'application/pkcs7-mime',
'.ps' : 'application/postscript',
'.eps' : 'application/postscript',
'.rtf' : 'application/rtf',
'.sql' : 'application/sql',
'.texi' : 'application/texinfo',
'.texinfo': 'application/texinfo',
'.toml' : 'application/toml',
'.trig' : 'application/trig',
'.m3u' : 'application/vnd.apple.mpegurl',
'.m3u8' : 'application/vnd.apple.mpegurl',
'.dll' : 'application/vnd.microsoft.portable-executable',
'.exe' : 'application/vnd.microsoft.portable-executable',
'.cab' : 'application/vnd.ms-cab-compressed',
'.xls' : 'application/vnd.ms-excel',
'.xlb' : 'application/vnd.ms-excel',
'.eot' : 'application/vnd.ms-fontobject',
'.chm' : 'application/vnd.ms-htmlhelp',
'.thmx' : 'application/vnd.ms-officetheme',
'.ppt' : 'application/vnd.ms-powerpoint',
'.pot' : 'application/vnd.ms-powerpoint',
'.ppa' : 'application/vnd.ms-powerpoint',
'.pps' : 'application/vnd.ms-powerpoint',
'.pwz' : 'application/vnd.ms-powerpoint',
'.odg' : 'application/vnd.oasis.opendocument.graphics',
'.odp' : 'application/vnd.oasis.opendocument.presentation',
'.ods' : 'application/vnd.oasis.opendocument.spreadsheet',
'.odt' : 'application/vnd.oasis.opendocument.text',
'.pptx' : 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
'.xlsx' : 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
'.docx' : 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
'.rar' : 'application/vnd.rar',
'.sqlite3': 'application/vnd.sqlite3',
'.sqlite' : 'application/vnd.sqlite3',
'.wasm' : 'application/wasm',
'.7z' : 'application/x-7z-compressed',
'.bcpio' : 'application/x-bcpio',
'.cpio' : 'application/x-cpio',
'.csh' : 'application/x-csh',
'.deb' : 'application/x-debian-package',
'.dvi' : 'application/x-dvi',
'.gtar' : 'application/x-gtar',
'.hdf' : 'application/x-hdf',
'.h5' : 'application/x-hdf5',
'.latex' : 'application/x-latex',
'.mif' : 'application/x-mif',
'.cdf' : 'application/x-netcdf',
'.nc' : 'application/x-netcdf',
'.p12' : 'application/x-pkcs12',
'.php' : 'application/x-httpd-php',
'.pfx' : 'application/x-pkcs12',
'.ram' : 'application/x-pn-realaudio',
'.pyc' : 'application/x-python-code',
'.pyo' : 'application/x-python-code',
'.rpm' : 'application/x-rpm',
'.sh' : 'application/x-sh',
'.shar' : 'application/x-shar',
'.swf' : 'application/x-shockwave-flash',
'.sv4cpio': 'application/x-sv4cpio',
'.sv4crc' : 'application/x-sv4crc',
'.tar' : 'application/x-tar',
'.tcl' : 'application/x-tcl',
'.tex' : 'application/x-tex',
'.roff' : 'application/x-troff',
'.t' : 'application/x-troff',
'.tr' : 'application/x-troff',
'.man' : 'application/x-troff-man',
'.me' : 'application/x-troff-me',
'.ms' : 'application/x-troff-ms',
'.ustar' : 'application/x-ustar',
'.src' : 'application/x-wais-source',
'.xsl' : 'application/xml',
'.rdf' : 'application/xml',
'.wsdl' : 'application/xml',
'.xpdl' : 'application/xml',
'.yaml' : 'application/yaml',
'.yml' : 'application/yaml',
'.zip' : 'application/zip',
'.3gp' : 'audio/3gpp',
'.3gpp' : 'audio/3gpp',
'.3g2' : 'audio/3gpp2',
'.3gpp2' : 'audio/3gpp2',
'.aac' : 'audio/aac',
'.adts' : 'audio/aac',
'.loas' : 'audio/aac',
'.ass' : 'audio/aac',
'.au' : 'audio/basic',
'.snd' : 'audio/basic',
'.flac' : 'audio/flac',
'.mka' : 'audio/matroska',
'.m4a' : 'audio/mp4',
'.mp3' : 'audio/mpeg',
'.mp2' : 'audio/mpeg',
'.ogg' : 'audio/ogg',
'.opus' : 'audio/opus',
'.aif' : 'audio/x-aiff',
'.aifc' : 'audio/x-aiff',
'.aiff' : 'audio/x-aiff',
'.ra' : 'audio/x-pn-realaudio',
'.wav' : 'audio/vnd.wave',
'.weba' : 'audio/webm',
'.ttc' : 'font/collection',
'.otf' : 'font/otf',
'.ttf' : 'font/ttf',
'.woff' : 'font/woff',
'.woff2' : 'font/woff2',
'.hjif' : 'haptics/hjif',
'.hmpg' : 'haptics/hmpg',
'.ivs' : 'haptics/ivs',
'.avif' : 'image/avif',
'.bmp' : 'image/bmp',
'.emf' : 'image/emf',
'.fits' : 'image/fits',
'.g3' : 'image/g3fax',
'.gif' : 'image/gif',
'.ief' : 'image/ief',
'.jp2' : 'image/jp2',
'.jpg' : 'image/jpeg',
'.jpe' : 'image/jpeg',
'.jpeg' : 'image/jpeg',
'.jpm' : 'image/jpm',
'.jpx' : 'image/jpx',
'.jxl' : 'image/jxl',
'.heic' : 'image/heic',
'.heif' : 'image/heif',
'.png' : 'image/png',
'.svg' : 'image/svg+xml',
'.t38' : 'image/t38',
'.tiff' : 'image/tiff',
'.tif' : 'image/tiff',
'.tfx' : 'image/tiff-fx',
'.ico' : 'image/vnd.microsoft.icon',
'.webp' : 'image/webp',
'.wmf' : 'image/wmf',
'.ras' : 'image/x-cmu-raster',
'.pnm' : 'image/x-portable-anymap',
'.pbm' : 'image/x-portable-bitmap',
'.pgm' : 'image/x-portable-graymap',
'.ppm' : 'image/x-portable-pixmap',
'.rgb' : 'image/x-rgb',
'.xbm' : 'image/x-xbitmap',
'.xpm' : 'image/x-xpixmap',
'.xwd' : 'image/x-xwindowdump',
'.eml' : 'message/rfc822',
'.mht' : 'message/rfc822',
'.mhtml' : 'message/rfc822',
'.nws' : 'message/rfc822',
'.gltf' : 'model/gltf+json',
'.glb' : 'model/gltf-binary',
'.stl' : 'model/stl',
'.css' : 'text/css',
'.csv' : 'text/csv',
'.html' : 'text/html',
'.htm' : 'text/html',
'.md' : 'text/markdown',
'.markdown': 'text/markdown',
'.n3' : 'text/n3',
'.txt' : 'text/plain',
'.bat' : 'text/plain',
'.c' : 'text/plain',
'.h' : 'text/plain',
'.ksh' : 'text/plain',
'.pl' : 'text/plain',
'.srt' : 'text/plain',
'.rtx' : 'text/richtext',
'.tsv' : 'text/tab-separated-values',
'.vtt' : 'text/vtt',
'.py' : 'text/x-python',
'.rst' : 'text/x-rst',
'.etx' : 'text/x-setext',
'.sgm' : 'text/x-sgml',
'.sgml' : 'text/x-sgml',
'.vcf' : 'text/x-vcard',
'.xml' : 'text/xml',
'.mkv' : 'video/matroska',
'.mk3d' : 'video/matroska-3d',
'.mp4' : 'video/mp4',
'.mpeg' : 'video/mpeg',
'.m1v' : 'video/mpeg',
'.mpa' : 'video/mpeg',
'.mpe' : 'video/mpeg',
'.mpg' : 'video/mpeg',
'.ogv' : 'video/ogg',
'.mov' : 'video/quicktime',
'.qt' : 'video/quicktime',
'.webm' : 'video/webm',
'.avi' : 'video/vnd.avi',
'.m4v' : 'video/x-m4v',
'.wmv' : 'video/x-ms-wmv',
'.movie' : 'video/x-sgi-movie',
}
# These are non-standard types, commonly found in the wild. They will
# only match if strict=0 flag is given to the API methods.
# Please sort these too
common_types = _common_types_default = {
'.apk' : 'application/vnd.android.package-archive',
'.midi': 'audio/midi',
'.mid' : 'audio/midi',
'.pict': 'image/pict',
'.pct' : 'image/pict',
'.pic' : 'image/pict',
'.xul' : 'text/xul',
}
_default_mime_types()
def _parse_args(args):
from argparse import ArgumentParser
parser = ArgumentParser(
description='map filename extensions to MIME types',
)
parser.add_argument(
'-e', '--extension',
action='store_true',
help='guess extension instead of type'
)
parser.add_argument(
'-l', '--lenient',
action='store_true',
help='additionally search for common but non-standard types'
)
parser.add_argument('type', nargs='+', help='a type to search')
args = parser.parse_args(args)
return args, parser.format_help()
def _main(args=None):
"""Run the mimetypes command-line interface and return a text to print."""
args, help_text = _parse_args(args)
results = []
if args.extension:
for gtype in args.type:
guess = guess_extension(gtype, not args.lenient)
if guess:
results.append(str(guess))
else:
results.append(f"error: unknown type {gtype}")
return results
else:
for gtype in args.type:
guess, encoding = guess_type(gtype, not args.lenient)
if guess:
results.append(f"type: {guess} encoding: {encoding}")
else:
results.append(f"error: media type unknown for {gtype}")
return results
if __name__ == '__main__':
import sys
results = _main()
print("\n".join(results))
sys.exit(any(result.startswith("error: ") for result in results))
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