| 1 | #! /usr/bin/env python
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| 2 |
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| 3 | """Mimification and unmimification of mail messages.
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| 4 |
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| 5 | Decode quoted-printable parts of a mail message or encode using
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| 6 | quoted-printable.
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| 7 |
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| 8 | Usage:
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| 9 | mimify(input, output)
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| 10 | unmimify(input, output, decode_base64 = 0)
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| 11 | to encode and decode respectively. Input and output may be the name
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| 12 | of a file or an open file object. Only a readline() method is used
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| 13 | on the input file, only a write() method is used on the output file.
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| 14 | When using file names, the input and output file names may be the
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| 15 | same.
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| 16 |
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| 17 | Interactive usage:
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| 18 | mimify.py -e [infile [outfile]]
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| 19 | mimify.py -d [infile [outfile]]
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| 20 | to encode and decode respectively. Infile defaults to standard
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| 21 | input and outfile to standard output.
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| 22 | """
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| 23 |
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| 24 | # Configure
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| 25 | MAXLEN = 200 # if lines longer than this, encode as quoted-printable
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| 26 | CHARSET = 'ISO-8859-1' # default charset for non-US-ASCII mail
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| 27 | QUOTE = '> ' # string replies are quoted with
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| 28 | # End configure
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| 29 |
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| 30 | import re
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| 31 |
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| 32 | import warnings
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| 33 | warnings.warn("the mimify module is deprecated; use the email package instead",
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| 34 | DeprecationWarning, 2)
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| 35 |
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| 36 | __all__ = ["mimify","unmimify","mime_encode_header","mime_decode_header"]
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| 37 |
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| 38 | qp = re.compile('^content-transfer-encoding:\\s*quoted-printable', re.I)
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| 39 | base64_re = re.compile('^content-transfer-encoding:\\s*base64', re.I)
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| 40 | mp = re.compile('^content-type:.*multipart/.*boundary="?([^;"\n]*)', re.I|re.S)
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| 41 | chrset = re.compile('^(content-type:.*charset=")(us-ascii|iso-8859-[0-9]+)(".*)', re.I|re.S)
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| 42 | he = re.compile('^-*\n')
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| 43 | mime_code = re.compile('=([0-9a-f][0-9a-f])', re.I)
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| 44 | mime_head = re.compile('=\\?iso-8859-1\\?q\\?([^? \t\n]+)\\?=', re.I)
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| 45 | repl = re.compile('^subject:\\s+re: ', re.I)
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| 46 |
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| 47 | class File:
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| 48 | """A simple fake file object that knows about limited read-ahead and
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| 49 | boundaries. The only supported method is readline()."""
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| 50 |
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| 51 | def __init__(self, file, boundary):
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| 52 | self.file = file
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| 53 | self.boundary = boundary
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| 54 | self.peek = None
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| 55 |
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| 56 | def readline(self):
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| 57 | if self.peek is not None:
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| 58 | return ''
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| 59 | line = self.file.readline()
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| 60 | if not line:
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| 61 | return line
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| 62 | if self.boundary:
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| 63 | if line == self.boundary + '\n':
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| 64 | self.peek = line
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| 65 | return ''
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| 66 | if line == self.boundary + '--\n':
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| 67 | self.peek = line
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| 68 | return ''
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| 69 | return line
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| 70 |
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| 71 | class HeaderFile:
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| 72 | def __init__(self, file):
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| 73 | self.file = file
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| 74 | self.peek = None
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| 75 |
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| 76 | def readline(self):
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| 77 | if self.peek is not None:
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| 78 | line = self.peek
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| 79 | self.peek = None
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| 80 | else:
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| 81 | line = self.file.readline()
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| 82 | if not line:
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| 83 | return line
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| 84 | if he.match(line):
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| 85 | return line
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| 86 | while 1:
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| 87 | self.peek = self.file.readline()
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| 88 | if len(self.peek) == 0 or \
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| 89 | (self.peek[0] != ' ' and self.peek[0] != '\t'):
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| 90 | return line
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| 91 | line = line + self.peek
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| 92 | self.peek = None
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| 93 |
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| 94 | def mime_decode(line):
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| 95 | """Decode a single line of quoted-printable text to 8bit."""
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| 96 | newline = ''
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| 97 | pos = 0
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| 98 | while 1:
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| 99 | res = mime_code.search(line, pos)
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| 100 | if res is None:
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| 101 | break
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| 102 | newline = newline + line[pos:res.start(0)] + \
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| 103 | chr(int(res.group(1), 16))
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| 104 | pos = res.end(0)
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| 105 | return newline + line[pos:]
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| 106 |
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| 107 | def mime_decode_header(line):
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| 108 | """Decode a header line to 8bit."""
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| 109 | newline = ''
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| 110 | pos = 0
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| 111 | while 1:
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| 112 | res = mime_head.search(line, pos)
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| 113 | if res is None:
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| 114 | break
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| 115 | match = res.group(1)
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| 116 | # convert underscores to spaces (before =XX conversion!)
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| 117 | match = ' '.join(match.split('_'))
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| 118 | newline = newline + line[pos:res.start(0)] + mime_decode(match)
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| 119 | pos = res.end(0)
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| 120 | return newline + line[pos:]
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| 121 |
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| 122 | def unmimify_part(ifile, ofile, decode_base64 = 0):
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| 123 | """Convert a quoted-printable part of a MIME mail message to 8bit."""
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| 124 | multipart = None
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| 125 | quoted_printable = 0
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| 126 | is_base64 = 0
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| 127 | is_repl = 0
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| 128 | if ifile.boundary and ifile.boundary[:2] == QUOTE:
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| 129 | prefix = QUOTE
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| 130 | else:
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| 131 | prefix = ''
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| 132 |
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| 133 | # read header
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| 134 | hfile = HeaderFile(ifile)
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| 135 | while 1:
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| 136 | line = hfile.readline()
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| 137 | if not line:
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| 138 | return
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| 139 | if prefix and line[:len(prefix)] == prefix:
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| 140 | line = line[len(prefix):]
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| 141 | pref = prefix
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| 142 | else:
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| 143 | pref = ''
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| 144 | line = mime_decode_header(line)
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| 145 | if qp.match(line):
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| 146 | quoted_printable = 1
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| 147 | continue # skip this header
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| 148 | if decode_base64 and base64_re.match(line):
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| 149 | is_base64 = 1
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| 150 | continue
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| 151 | ofile.write(pref + line)
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| 152 | if not prefix and repl.match(line):
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| 153 | # we're dealing with a reply message
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| 154 | is_repl = 1
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| 155 | mp_res = mp.match(line)
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| 156 | if mp_res:
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| 157 | multipart = '--' + mp_res.group(1)
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| 158 | if he.match(line):
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| 159 | break
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| 160 | if is_repl and (quoted_printable or multipart):
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| 161 | is_repl = 0
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| 162 |
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| 163 | # read body
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| 164 | while 1:
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| 165 | line = ifile.readline()
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| 166 | if not line:
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| 167 | return
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| 168 | line = re.sub(mime_head, '\\1', line)
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| 169 | if prefix and line[:len(prefix)] == prefix:
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| 170 | line = line[len(prefix):]
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| 171 | pref = prefix
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| 172 | else:
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| 173 | pref = ''
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| 174 | ## if is_repl and len(line) >= 4 and line[:4] == QUOTE+'--' and line[-3:] != '--\n':
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| 175 | ## multipart = line[:-1]
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| 176 | while multipart:
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| 177 | if line == multipart + '--\n':
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| 178 | ofile.write(pref + line)
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| 179 | multipart = None
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| 180 | line = None
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| 181 | break
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| 182 | if line == multipart + '\n':
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| 183 | ofile.write(pref + line)
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| 184 | nifile = File(ifile, multipart)
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| 185 | unmimify_part(nifile, ofile, decode_base64)
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| 186 | line = nifile.peek
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| 187 | if not line:
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| 188 | # premature end of file
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| 189 | break
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| 190 | continue
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| 191 | # not a boundary between parts
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| 192 | break
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| 193 | if line and quoted_printable:
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| 194 | while line[-2:] == '=\n':
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| 195 | line = line[:-2]
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| 196 | newline = ifile.readline()
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| 197 | if newline[:len(QUOTE)] == QUOTE:
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| 198 | newline = newline[len(QUOTE):]
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| 199 | line = line + newline
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| 200 | line = mime_decode(line)
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| 201 | if line and is_base64 and not pref:
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| 202 | import base64
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| 203 | line = base64.decodestring(line)
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| 204 | if line:
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| 205 | ofile.write(pref + line)
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| 206 |
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| 207 | def unmimify(infile, outfile, decode_base64 = 0):
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| 208 | """Convert quoted-printable parts of a MIME mail message to 8bit."""
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| 209 | if type(infile) == type(''):
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| 210 | ifile = open(infile)
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| 211 | if type(outfile) == type('') and infile == outfile:
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| 212 | import os
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| 213 | d, f = os.path.split(infile)
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| 214 | os.rename(infile, os.path.join(d, ',' + f))
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| 215 | else:
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| 216 | ifile = infile
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| 217 | if type(outfile) == type(''):
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| 218 | ofile = open(outfile, 'w')
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| 219 | else:
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| 220 | ofile = outfile
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| 221 | nifile = File(ifile, None)
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| 222 | unmimify_part(nifile, ofile, decode_base64)
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| 223 | ofile.flush()
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| 224 |
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| 225 | mime_char = re.compile('[=\177-\377]') # quote these chars in body
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| 226 | mime_header_char = re.compile('[=?\177-\377]') # quote these in header
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| 227 |
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| 228 | def mime_encode(line, header):
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| 229 | """Code a single line as quoted-printable.
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| 230 | If header is set, quote some extra characters."""
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| 231 | if header:
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| 232 | reg = mime_header_char
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| 233 | else:
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| 234 | reg = mime_char
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| 235 | newline = ''
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| 236 | pos = 0
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| 237 | if len(line) >= 5 and line[:5] == 'From ':
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| 238 | # quote 'From ' at the start of a line for stupid mailers
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| 239 | newline = ('=%02x' % ord('F')).upper()
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| 240 | pos = 1
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| 241 | while 1:
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| 242 | res = reg.search(line, pos)
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| 243 | if res is None:
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| 244 | break
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| 245 | newline = newline + line[pos:res.start(0)] + \
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| 246 | ('=%02x' % ord(res.group(0))).upper()
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| 247 | pos = res.end(0)
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| 248 | line = newline + line[pos:]
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| 249 |
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| 250 | newline = ''
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| 251 | while len(line) >= 75:
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| 252 | i = 73
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| 253 | while line[i] == '=' or line[i-1] == '=':
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| 254 | i = i - 1
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| 255 | i = i + 1
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| 256 | newline = newline + line[:i] + '=\n'
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| 257 | line = line[i:]
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| 258 | return newline + line
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| 259 |
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| 260 | mime_header = re.compile('([ \t(]|^)([-a-zA-Z0-9_+]*[\177-\377][-a-zA-Z0-9_+\177-\377]*)(?=[ \t)]|\n)')
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| 261 |
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| 262 | def mime_encode_header(line):
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| 263 | """Code a single header line as quoted-printable."""
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| 264 | newline = ''
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| 265 | pos = 0
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| 266 | while 1:
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| 267 | res = mime_header.search(line, pos)
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| 268 | if res is None:
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| 269 | break
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| 270 | newline = '%s%s%s=?%s?Q?%s?=' % \
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| 271 | (newline, line[pos:res.start(0)], res.group(1),
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| 272 | CHARSET, mime_encode(res.group(2), 1))
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| 273 | pos = res.end(0)
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| 274 | return newline + line[pos:]
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| 275 |
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| 276 | mv = re.compile('^mime-version:', re.I)
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| 277 | cte = re.compile('^content-transfer-encoding:', re.I)
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| 278 | iso_char = re.compile('[\177-\377]')
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| 279 |
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| 280 | def mimify_part(ifile, ofile, is_mime):
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| 281 | """Convert an 8bit part of a MIME mail message to quoted-printable."""
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| 282 | has_cte = is_qp = is_base64 = 0
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| 283 | multipart = None
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| 284 | must_quote_body = must_quote_header = has_iso_chars = 0
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| 285 |
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| 286 | header = []
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| 287 | header_end = ''
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| 288 | message = []
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| 289 | message_end = ''
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| 290 | # read header
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| 291 | hfile = HeaderFile(ifile)
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| 292 | while 1:
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| 293 | line = hfile.readline()
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| 294 | if not line:
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| 295 | break
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| 296 | if not must_quote_header and iso_char.search(line):
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| 297 | must_quote_header = 1
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| 298 | if mv.match(line):
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| 299 | is_mime = 1
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| 300 | if cte.match(line):
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| 301 | has_cte = 1
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| 302 | if qp.match(line):
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| 303 | is_qp = 1
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| 304 | elif base64_re.match(line):
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| 305 | is_base64 = 1
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| 306 | mp_res = mp.match(line)
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| 307 | if mp_res:
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| 308 | multipart = '--' + mp_res.group(1)
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| 309 | if he.match(line):
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| 310 | header_end = line
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| 311 | break
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| 312 | header.append(line)
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| 313 |
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| 314 | # read body
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| 315 | while 1:
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| 316 | line = ifile.readline()
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| 317 | if not line:
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| 318 | break
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| 319 | if multipart:
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| 320 | if line == multipart + '--\n':
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| 321 | message_end = line
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| 322 | break
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| 323 | if line == multipart + '\n':
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| 324 | message_end = line
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| 325 | break
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| 326 | if is_base64:
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| 327 | message.append(line)
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| 328 | continue
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| 329 | if is_qp:
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| 330 | while line[-2:] == '=\n':
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| 331 | line = line[:-2]
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| 332 | newline = ifile.readline()
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| 333 | if newline[:len(QUOTE)] == QUOTE:
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| 334 | newline = newline[len(QUOTE):]
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| 335 | line = line + newline
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| 336 | line = mime_decode(line)
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| 337 | message.append(line)
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| 338 | if not has_iso_chars:
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| 339 | if iso_char.search(line):
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| 340 | has_iso_chars = must_quote_body = 1
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| 341 | if not must_quote_body:
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| 342 | if len(line) > MAXLEN:
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| 343 | must_quote_body = 1
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| 344 |
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| 345 | # convert and output header and body
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| 346 | for line in header:
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| 347 | if must_quote_header:
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| 348 | line = mime_encode_header(line)
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| 349 | chrset_res = chrset.match(line)
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| 350 | if chrset_res:
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| 351 | if has_iso_chars:
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| 352 | # change us-ascii into iso-8859-1
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| 353 | if chrset_res.group(2).lower() == 'us-ascii':
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| 354 | line = '%s%s%s' % (chrset_res.group(1),
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| 355 | CHARSET,
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| 356 | chrset_res.group(3))
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| 357 | else:
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| 358 | # change iso-8859-* into us-ascii
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| 359 | line = '%sus-ascii%s' % chrset_res.group(1, 3)
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| 360 | if has_cte and cte.match(line):
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| 361 | line = 'Content-Transfer-Encoding: '
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| 362 | if is_base64:
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| 363 | line = line + 'base64\n'
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| 364 | elif must_quote_body:
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| 365 | line = line + 'quoted-printable\n'
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| 366 | else:
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| 367 | line = line + '7bit\n'
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| 368 | ofile.write(line)
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| 369 | if (must_quote_header or must_quote_body) and not is_mime:
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| 370 | ofile.write('Mime-Version: 1.0\n')
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| 371 | ofile.write('Content-Type: text/plain; ')
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| 372 | if has_iso_chars:
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| 373 | ofile.write('charset="%s"\n' % CHARSET)
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| 374 | else:
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| 375 | ofile.write('charset="us-ascii"\n')
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| 376 | if must_quote_body and not has_cte:
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| 377 | ofile.write('Content-Transfer-Encoding: quoted-printable\n')
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| 378 | ofile.write(header_end)
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| 379 |
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| 380 | for line in message:
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| 381 | if must_quote_body:
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| 382 | line = mime_encode(line, 0)
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| 383 | ofile.write(line)
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| 384 | ofile.write(message_end)
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| 385 |
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| 386 | line = message_end
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| 387 | while multipart:
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| 388 | if line == multipart + '--\n':
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| 389 | # read bit after the end of the last part
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| 390 | while 1:
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| 391 | line = ifile.readline()
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| 392 | if not line:
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| 393 | return
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| 394 | if must_quote_body:
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| 395 | line = mime_encode(line, 0)
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| 396 | ofile.write(line)
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| 397 | if line == multipart + '\n':
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| 398 | nifile = File(ifile, multipart)
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| 399 | mimify_part(nifile, ofile, 1)
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| 400 | line = nifile.peek
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| 401 | if not line:
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| 402 | # premature end of file
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| 403 | break
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| 404 | ofile.write(line)
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| 405 | continue
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| 406 | # unexpectedly no multipart separator--copy rest of file
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| 407 | while 1:
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| 408 | line = ifile.readline()
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| 409 | if not line:
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| 410 | return
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| 411 | if must_quote_body:
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| 412 | line = mime_encode(line, 0)
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| 413 | ofile.write(line)
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| 414 |
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| 415 | def mimify(infile, outfile):
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| 416 | """Convert 8bit parts of a MIME mail message to quoted-printable."""
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| 417 | if type(infile) == type(''):
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| 418 | ifile = open(infile)
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| 419 | if type(outfile) == type('') and infile == outfile:
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| 420 | import os
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| 421 | d, f = os.path.split(infile)
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| 422 | os.rename(infile, os.path.join(d, ',' + f))
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| 423 | else:
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| 424 | ifile = infile
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| 425 | if type(outfile) == type(''):
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| 426 | ofile = open(outfile, 'w')
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| 427 | else:
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| 428 | ofile = outfile
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| 429 | nifile = File(ifile, None)
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| 430 | mimify_part(nifile, ofile, 0)
|
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| 431 | ofile.flush()
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| 432 |
|
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| 433 | import sys
|
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| 434 | if __name__ == '__main__' or (len(sys.argv) > 0 and sys.argv[0] == 'mimify'):
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| 435 | import getopt
|
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| 436 | usage = 'Usage: mimify [-l len] -[ed] [infile [outfile]]'
|
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| 437 |
|
|---|
| 438 | decode_base64 = 0
|
|---|
| 439 | opts, args = getopt.getopt(sys.argv[1:], 'l:edb')
|
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| 440 | if len(args) not in (0, 1, 2):
|
|---|
| 441 | print usage
|
|---|
| 442 | sys.exit(1)
|
|---|
| 443 | if (('-e', '') in opts) == (('-d', '') in opts) or \
|
|---|
| 444 | ((('-b', '') in opts) and (('-d', '') not in opts)):
|
|---|
| 445 | print usage
|
|---|
| 446 | sys.exit(1)
|
|---|
| 447 | for o, a in opts:
|
|---|
| 448 | if o == '-e':
|
|---|
| 449 | encode = mimify
|
|---|
| 450 | elif o == '-d':
|
|---|
| 451 | encode = unmimify
|
|---|
| 452 | elif o == '-l':
|
|---|
| 453 | try:
|
|---|
| 454 | MAXLEN = int(a)
|
|---|
| 455 | except (ValueError, OverflowError):
|
|---|
| 456 | print usage
|
|---|
| 457 | sys.exit(1)
|
|---|
| 458 | elif o == '-b':
|
|---|
| 459 | decode_base64 = 1
|
|---|
| 460 | if len(args) == 0:
|
|---|
| 461 | encode_args = (sys.stdin, sys.stdout)
|
|---|
| 462 | elif len(args) == 1:
|
|---|
| 463 | encode_args = (args[0], sys.stdout)
|
|---|
| 464 | else:
|
|---|
| 465 | encode_args = (args[0], args[1])
|
|---|
| 466 | if decode_base64:
|
|---|
| 467 | encode_args = encode_args + (decode_base64,)
|
|---|
| 468 | encode(*encode_args)
|
|---|
