| #! /usr/bin/env 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 |
| |
| __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) |