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mimify.py
#! /opt/alt/python27/bin/python """Mimification and unmimification of mail messages. Decode quoted-printable parts of a mail message or encode using quoted-printable. Usage: mimify(input, output) unmimify(input, output, decode_base64 = 0) to encode and decode respectively. Input and output may be the name of a file or an open file object. Only a readline() method is used on the input file, only a write() method is used on the output file. When using file names, the input and output file names may be the same. Interactive usage: mimify.py -e [infile [outfile]] mimify.py -d [infile [outfile]] to encode and decode respectively. Infile defaults to standard input and outfile to standard output. """ # Configure MAXLEN = 200 # if lines longer than this, encode as quoted-printable CHARSET = 'ISO-8859-1' # default charset for non-US-ASCII mail QUOTE = '> ' # string replies are quoted with # End configure import re import warnings warnings.warn("the mimify module is deprecated; use the email package instead", DeprecationWarning, 2) __all__ = ["mimify","unmimify","mime_encode_header","mime_decode_header"] qp = re.compile('^content-transfer-encoding:\\s*quoted-printable', re.I) base64_re = re.compile('^content-transfer-encoding:\\s*base64', re.I) mp = re.compile('^content-type:.*multipart/.*boundary="?([^;"\n]*)', re.I|re.S) chrset = re.compile('^(content-type:.*charset=")(us-ascii|iso-8859-[0-9]+)(".*)', re.I|re.S) he = re.compile('^-*\n') mime_code = re.compile('=([0-9a-f][0-9a-f])', re.I) mime_head = re.compile('=\\?iso-8859-1\\?q\\?([^? \t\n]+)\\?=', re.I) repl = re.compile('^subject:\\s+re: ', re.I) class File: """A simple fake file object that knows about limited read-ahead and boundaries. The only supported method is readline().""" def __init__(self, file, boundary): self.file = file self.boundary = boundary self.peek = None def readline(self): if self.peek is not None: return '' line = self.file.readline() if not line: return line if self.boundary: if line == self.boundary + '\n': self.peek = line return '' if line == self.boundary + '--\n': self.peek = line return '' return line class HeaderFile: def __init__(self, file): self.file = file self.peek = None def readline(self): if self.peek is not None: line = self.peek self.peek = None else: line = self.file.readline() if not line: return line if he.match(line): return line while 1: self.peek = self.file.readline() if len(self.peek) == 0 or \ (self.peek[0] != ' ' and self.peek[0] != '\t'): return line line = line + self.peek self.peek = None def mime_decode(line): """Decode a single line of quoted-printable text to 8bit.""" newline = '' pos = 0 while 1: res = mime_code.search(line, pos) if res is None: break newline = newline + line[pos:res.start(0)] + \ chr(int(res.group(1), 16)) pos = res.end(0) return newline + line[pos:] def mime_decode_header(line): """Decode a header line to 8bit.""" newline = '' pos = 0 while 1: res = mime_head.search(line, pos) if res is None: break match = res.group(1) # convert underscores to spaces (before =XX conversion!) match = ' '.join(match.split('_')) newline = newline + line[pos:res.start(0)] + mime_decode(match) pos = res.end(0) return newline + line[pos:] def unmimify_part(ifile, ofile, decode_base64 = 0): """Convert a quoted-printable part of a MIME mail message to 8bit.""" multipart = None quoted_printable = 0 is_base64 = 0 is_repl = 0 if ifile.boundary and ifile.boundary[:2] == QUOTE: prefix = QUOTE else: prefix = '' # read header hfile = HeaderFile(ifile) while 1: line = hfile.readline() if not line: return if prefix and line[:len(prefix)] == prefix: line = line[len(prefix):] pref = prefix else: pref = '' line = mime_decode_header(line) if qp.match(line): quoted_printable = 1 continue # skip this header if decode_base64 and base64_re.match(line): is_base64 = 1 continue ofile.write(pref + line) if not prefix and repl.match(line): # we're dealing with a reply message is_repl = 1 mp_res = mp.match(line) if mp_res: multipart = '--' + mp_res.group(1) if he.match(line): break if is_repl and (quoted_printable or multipart): is_repl = 0 # read body while 1: line = ifile.readline() if not line: return line = re.sub(mime_head, '\\1', line) if prefix and line[:len(prefix)] == prefix: line = line[len(prefix):] pref = prefix else: pref = '' ## if is_repl and len(line) >= 4 and line[:4] == QUOTE+'--' and line[-3:] != '--\n': ## multipart = line[:-1] while multipart: if line == multipart + '--\n': ofile.write(pref + line) multipart = None line = None break if line == multipart + '\n': ofile.write(pref + line) nifile = File(ifile, multipart) unmimify_part(nifile, ofile, decode_base64) line = nifile.peek if not line: # premature end of file break continue # not a boundary between parts break if line and quoted_printable: while line[-2:] == '=\n': line = line[:-2] newline = ifile.readline() if newline[:len(QUOTE)] == QUOTE: newline = newline[len(QUOTE):] line = line + newline line = mime_decode(line) if line and is_base64 and not pref: import base64 line = base64.decodestring(line) if line: ofile.write(pref + line) def unmimify(infile, outfile, decode_base64 = 0): """Convert quoted-printable parts of a MIME mail message to 8bit.""" if type(infile) == type(''): ifile = open(infile) if type(outfile) == type('') and infile == outfile: import os d, f = os.path.split(infile) os.rename(infile, os.path.join(d, ',' + f)) else: ifile = infile if type(outfile) == type(''): ofile = open(outfile, 'w') else: ofile = outfile nifile = File(ifile, None) unmimify_part(nifile, ofile, decode_base64) ofile.flush() mime_char = re.compile('[=\177-\377]') # quote these chars in body mime_header_char = re.compile('[=?\177-\377]') # quote these in header def mime_encode(line, header): """Code a single line as quoted-printable. If header is set, quote some extra characters.""" if header: reg = mime_header_char else: reg = mime_char newline = '' pos = 0 if len(line) >= 5 and line[:5] == 'From ': # quote 'From ' at the start of a line for stupid mailers newline = ('=%02x' % ord('F')).upper() pos = 1 while 1: res = reg.search(line, pos) if res is None: break newline = newline + line[pos:res.start(0)] + \ ('=%02x' % ord(res.group(0))).upper() pos = res.end(0) line = newline + line[pos:] newline = '' while len(line) >= 75: i = 73 while line[i] == '=' or line[i-1] == '=': i = i - 1 i = i + 1 newline = newline + line[:i] + '=\n' line = line[i:] return newline + line mime_header = re.compile('([ \t(]|^)([-a-zA-Z0-9_+]*[\177-\377][-a-zA-Z0-9_+\177-\377]*)(?=[ \t)]|\n)') def mime_encode_header(line): """Code a single header line as quoted-printable.""" newline = '' pos = 0 while 1: res = mime_header.search(line, pos) if res is None: break newline = '%s%s%s=?%s?Q?%s?=' % \ (newline, line[pos:res.start(0)], res.group(1), CHARSET, mime_encode(res.group(2), 1)) pos = res.end(0) return newline + line[pos:] mv = re.compile('^mime-version:', re.I) cte = re.compile('^content-transfer-encoding:', re.I) iso_char = re.compile('[\177-\377]') def mimify_part(ifile, ofile, is_mime): """Convert an 8bit part of a MIME mail message to quoted-printable.""" has_cte = is_qp = is_base64 = 0 multipart = None must_quote_body = must_quote_header = has_iso_chars = 0 header = [] header_end = '' message = [] message_end = '' # read header hfile = HeaderFile(ifile) while 1: line = hfile.readline() if not line: break if not must_quote_header and iso_char.search(line): must_quote_header = 1 if mv.match(line): is_mime = 1 if cte.match(line): has_cte = 1 if qp.match(line): is_qp = 1 elif base64_re.match(line): is_base64 = 1 mp_res = mp.match(line) if mp_res: multipart = '--' + mp_res.group(1) if he.match(line): header_end = line break header.append(line) # read body while 1: line = ifile.readline() if not line: break if multipart: if line == multipart + '--\n': message_end = line break if line == multipart + '\n': message_end = line break if is_base64: message.append(line) continue if is_qp: while line[-2:] == '=\n': line = line[:-2] newline = ifile.readline() if newline[:len(QUOTE)] == QUOTE: newline = newline[len(QUOTE):] line = line + newline line = mime_decode(line) message.append(line) if not has_iso_chars: if iso_char.search(line): has_iso_chars = must_quote_body = 1 if not must_quote_body: if len(line) > MAXLEN: must_quote_body = 1 # convert and output header and body for line in header: if must_quote_header: line = mime_encode_header(line) chrset_res = chrset.match(line) if chrset_res: if has_iso_chars: # change us-ascii into iso-8859-1 if chrset_res.group(2).lower() == 'us-ascii': line = '%s%s%s' % (chrset_res.group(1), CHARSET, chrset_res.group(3)) else: # change iso-8859-* into us-ascii line = '%sus-ascii%s' % chrset_res.group(1, 3) if has_cte and cte.match(line): line = 'Content-Transfer-Encoding: ' if is_base64: line = line + 'base64\n' elif must_quote_body: line = line + 'quoted-printable\n' else: line = line + '7bit\n' ofile.write(line) if (must_quote_header or must_quote_body) and not is_mime: ofile.write('Mime-Version: 1.0\n') ofile.write('Content-Type: text/plain; ') if has_iso_chars: ofile.write('charset="%s"\n' % CHARSET) else: ofile.write('charset="us-ascii"\n') if must_quote_body and not has_cte: ofile.write('Content-Transfer-Encoding: quoted-printable\n') ofile.write(header_end) for line in message: if must_quote_body: line = mime_encode(line, 0) ofile.write(line) ofile.write(message_end) line = message_end while multipart: if line == multipart + '--\n': # read bit after the end of the last part while 1: line = ifile.readline() if not line: return if must_quote_body: line = mime_encode(line, 0) ofile.write(line) if line == multipart + '\n': nifile = File(ifile, multipart) mimify_part(nifile, ofile, 1) line = nifile.peek if not line: # premature end of file break ofile.write(line) continue # unexpectedly no multipart separator--copy rest of file while 1: line = ifile.readline() if not line: return if must_quote_body: line = mime_encode(line, 0) ofile.write(line) def mimify(infile, outfile): """Convert 8bit parts of a MIME mail message to quoted-printable.""" if type(infile) == type(''): ifile = open(infile) if type(outfile) == type('') and infile == outfile: import os d, f = os.path.split(infile) os.rename(infile, os.path.join(d, ',' + f)) else: ifile = infile if type(outfile) == type(''): ofile = open(outfile, 'w') else: ofile = outfile nifile = File(ifile, None) mimify_part(nifile, ofile, 0) ofile.flush() import sys if __name__ == '__main__' or (len(sys.argv) > 0 and sys.argv[0] == 'mimify'): import getopt usage = 'Usage: mimify [-l len] -[ed] [infile [outfile]]' decode_base64 = 0 opts, args = getopt.getopt(sys.argv[1:], 'l:edb') if len(args) not in (0, 1, 2): print usage sys.exit(1) if (('-e', '') in opts) == (('-d', '') in opts) or \ ((('-b', '') in opts) and (('-d', '') not in opts)): print usage sys.exit(1) for o, a in opts: if o == '-e': encode = mimify elif o == '-d': encode = unmimify elif o == '-l': try: MAXLEN = int(a) except (ValueError, OverflowError): print usage sys.exit(1) elif o == '-b': decode_base64 = 1 if len(args) == 0: encode_args = (sys.stdin, sys.stdout) elif len(args) == 1: encode_args = (args[0], sys.stdout) else: encode_args = (args[0], args[1]) if decode_base64: encode_args = encode_args + (decode_base64,) encode(*encode_args)
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