Guido van Rossum | ac8a9f3 | 1997-09-30 19:05:50 +0000 | [diff] [blame] | 1 | """Guess the MIME type of a file. |
| 2 | |
| 3 | This module defines one useful function: |
| 4 | |
| 5 | guess_type(url) -- guess the MIME type and encoding of a URL. |
| 6 | |
| 7 | It also contains the following, for tuning the behavior: |
| 8 | |
| 9 | Data: |
| 10 | |
| 11 | knownfiles -- list of files to parse |
| 12 | inited -- flag set when init() has been called |
| 13 | suffixes_map -- dictionary mapping suffixes to suffixes |
| 14 | encodings_map -- dictionary mapping suffixes to encodings |
| 15 | types_map -- dictionary mapping suffixes to types |
| 16 | |
| 17 | Functions: |
| 18 | |
| 19 | init([files]) -- parse a list of files, default knownfiles |
| 20 | read_mime_types(file) -- parse one file, return a dictionary or None |
| 21 | |
| 22 | """ |
| 23 | |
| 24 | import string |
| 25 | import posixpath |
| 26 | |
| 27 | knownfiles = [ |
| 28 | "/usr/local/etc/httpd/conf/mime.types", |
| 29 | "/usr/local/lib/netscape/mime.types", |
| 30 | ] |
| 31 | |
| 32 | inited = 0 |
| 33 | |
| 34 | def guess_type(url): |
| 35 | """Guess the type of a file based on its URL. |
| 36 | |
| 37 | Return value is a tuple (type, encoding) where type is None if the |
| 38 | type can't be guessed (no or unknown suffix) or a string of the |
| 39 | form type/subtype, usable for a MIME Content-type header; and |
| 40 | encoding is None for no encoding or the name of the program used |
| 41 | to encode (e.g. compress or gzip). The mappings are table |
| 42 | driven. Encoding suffixes are case sensitive; type suffixes are |
| 43 | first tried case sensitive, then case insensitive. |
| 44 | |
| 45 | The suffixes .tgz, .taz and .tz (case sensitive!) are all mapped |
| 46 | to ".tar.gz". (This is table-driven too, using the dictionary |
| 47 | suffixes_map). |
| 48 | |
| 49 | """ |
| 50 | if not inited: |
| 51 | init() |
| 52 | base, ext = posixpath.splitext(url) |
| 53 | while suffix_map.has_key(ext): |
| 54 | base, ext = posixpath.splitext(base + suffix_map[ext]) |
| 55 | if encodings_map.has_key(ext): |
| 56 | encoding = encodings_map[ext] |
| 57 | base, ext = posixpath.splitext(base) |
| 58 | else: |
| 59 | encoding = None |
| 60 | if types_map.has_key(ext): |
| 61 | return types_map[ext], encoding |
| 62 | elif types_map.has_key(string.lower(ext)): |
| 63 | return types_map[string.lower(ext)], encoding |
| 64 | else: |
| 65 | return None, encoding |
| 66 | |
| 67 | def init(files=None): |
| 68 | global inited |
| 69 | for file in files or knownfiles: |
| 70 | s = read_mime_types(file) |
| 71 | if s: |
| 72 | for key, value in s.items(): |
| 73 | types_map[key] = value |
| 74 | inited = 1 |
| 75 | |
| 76 | def read_mime_types(file): |
| 77 | try: |
| 78 | f = open(file) |
| 79 | except IOError: |
| 80 | return None |
| 81 | map = {} |
| 82 | while 1: |
| 83 | line = f.readline() |
| 84 | if not line: break |
| 85 | words = string.split(line) |
| 86 | for i in range(len(words)): |
| 87 | if words[i][0] == '#': |
| 88 | del words[i:] |
| 89 | break |
| 90 | if not words: continue |
| 91 | type, suffixes = words[0], words[1:] |
| 92 | for suff in suffixes: |
| 93 | map['.'+suff] = type |
| 94 | f.close() |
| 95 | return map |
| 96 | |
| 97 | suffix_map = { |
| 98 | '.tgz': '.tar.gz', |
| 99 | '.taz': '.tar.gz', |
| 100 | '.tz': '.tar.gz', |
| 101 | } |
| 102 | |
| 103 | encodings_map = { |
| 104 | '.gz': 'gzip', |
| 105 | '.Z': 'compress', |
| 106 | } |
| 107 | |
| 108 | types_map = { |
| 109 | '.a': 'application/octet-stream', |
| 110 | '.ai': 'application/postscript', |
| 111 | '.aif': 'audio/x-aiff', |
| 112 | '.aifc': 'audio/x-aiff', |
| 113 | '.aiff': 'audio/x-aiff', |
| 114 | '.au': 'audio/basic', |
| 115 | '.avi': 'video/x-msvideo', |
| 116 | '.bcpio': 'application/x-bcpio', |
| 117 | '.bin': 'application/octet-stream', |
| 118 | '.cdf': 'application/x-netcdf', |
| 119 | '.cpio': 'application/x-cpio', |
| 120 | '.csh': 'application/x-csh', |
| 121 | '.dll': 'application/octet-stream', |
| 122 | '.dvi': 'application/x-dvi', |
| 123 | '.exe': 'application/octet-stream', |
| 124 | '.eps': 'application/postscript', |
| 125 | '.etx': 'text/x-setext', |
| 126 | '.gif': 'image/gif', |
| 127 | '.gtar': 'application/x-gtar', |
| 128 | '.hdf': 'application/x-hdf', |
| 129 | '.htm': 'text/html', |
| 130 | '.html': 'text/html', |
| 131 | '.ief': 'image/ief', |
| 132 | '.jpe': 'image/jpeg', |
| 133 | '.jpeg': 'image/jpeg', |
| 134 | '.jpg': 'image/jpeg', |
| 135 | '.latex': 'application/x-latex', |
| 136 | '.man': 'application/x-troff-man', |
| 137 | '.me': 'application/x-troff-me', |
| 138 | '.mif': 'application/x-mif', |
| 139 | '.mov': 'video/quicktime', |
| 140 | '.movie': 'video/x-sgi-movie', |
| 141 | '.mpe': 'video/mpeg', |
| 142 | '.mpeg': 'video/mpeg', |
| 143 | '.mpg': 'video/mpeg', |
| 144 | '.ms': 'application/x-troff-ms', |
| 145 | '.nc': 'application/x-netcdf', |
| 146 | '.o': 'application/octet-stream', |
| 147 | '.obj': 'application/octet-stream', |
| 148 | '.oda': 'application/oda', |
| 149 | '.pbm': 'image/x-portable-bitmap', |
| 150 | '.pdf': 'application/pdf', |
| 151 | '.pgm': 'image/x-portable-graymap', |
| 152 | '.pnm': 'image/x-portable-anymap', |
| 153 | '.png': 'image/png', |
| 154 | '.ppm': 'image/x-portable-pixmap', |
| 155 | '.py': 'text/x-python', |
| 156 | '.pyc': 'application/x-python-code', |
| 157 | '.ps': 'application/postscript', |
| 158 | '.qt': 'video/quicktime', |
| 159 | '.ras': 'image/x-cmu-raster', |
| 160 | '.rgb': 'image/x-rgb', |
| 161 | '.roff': 'application/x-troff', |
| 162 | '.rtf': 'application/rtf', |
| 163 | '.rtx': 'text/richtext', |
| 164 | '.sgm': 'text/x-sgml', |
| 165 | '.sgml': 'text/x-sgml', |
| 166 | '.sh': 'application/x-sh', |
| 167 | '.shar': 'application/x-shar', |
| 168 | '.snd': 'audio/basic', |
| 169 | '.so': 'application/octet-stream', |
| 170 | '.src': 'application/x-wais-source', |
| 171 | '.sv4cpio': 'application/x-sv4cpio', |
| 172 | '.sv4crc': 'application/x-sv4crc', |
| 173 | '.t': 'application/x-troff', |
| 174 | '.tar': 'application/x-tar', |
| 175 | '.tcl': 'application/x-tcl', |
| 176 | '.tex': 'application/x-tex', |
| 177 | '.texi': 'application/x-texinfo', |
| 178 | '.texinfo': 'application/x-texinfo', |
| 179 | '.tif': 'image/tiff', |
| 180 | '.tiff': 'image/tiff', |
| 181 | '.tr': 'application/x-troff', |
| 182 | '.tsv': 'text/tab-separated-values', |
| 183 | '.txt': 'text/plain', |
| 184 | '.ustar': 'application/x-ustar', |
| 185 | '.wav': 'audio/x-wav', |
| 186 | '.xbm': 'image/x-xbitmap', |
| 187 | '.xpm': 'image/x-xpixmap', |
| 188 | '.xwd': 'image/x-xwindowdump', |
| 189 | '.zip': 'application/zip', |
| 190 | } |