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#! /usr/bin/env python2.4
"""Classes to handle Unix style, MMDF style, and MH style mailboxes."""
import rfc822
import os
__all__ = ["UnixMailbox","MmdfMailbox","MHMailbox","Maildir","BabylMailbox",
"PortableUnixMailbox"]
class _Mailbox:
def __init__(self, fp, factory=rfc822.Message):
self.fp = fp
self.seekp = 0
self.factory = factory
def __iter__(self):
return iter(self.next, None)
def next(self):
while 1:
self.fp.seek(self.seekp)
try:
self._search_start()
except EOFError:
self.seekp = self.fp.tell()
return None
start = self.fp.tell()
self._search_end()
self.seekp = stop = self.fp.tell()
if start != stop:
break
return self.factory(_Subfile(self.fp, start, stop))
class _Subfile:
def __init__(self, fp, start, stop):
self.fp = fp
self.start = start
self.stop = stop
self.pos = self.start
def _read(self, length, read_function):
if self.pos >= self.stop:
return ''
remaining = self.stop - self.pos
if length is None or length < 0 or length > remaining:
length = remaining
self.fp.seek(self.pos)
data = read_function(length)
self.pos = self.fp.tell()
return data
def read(self, length = None):
return self._read(length, self.fp.read)
def readline(self, length = None):
return self._read(length, self.fp.readline)
def readlines(self, sizehint = -1):
lines = []
while 1:
line = self.readline()
if not line:
break
lines.append(line)
if sizehint >= 0:
sizehint = sizehint - len(line)
if sizehint <= 0:
break
return lines
def tell(self):
return self.pos - self.start
def seek(self, pos, whence=0):
if whence == 0:
self.pos = self.start + pos
elif whence == 1:
self.pos = self.pos + pos
elif whence == 2:
self.pos = self.stop + pos
def close(self):
del self.fp
# Recommended to use PortableUnixMailbox instead!
class UnixMailbox(_Mailbox):
def _search_start(self):
while 1:
pos = self.fp.tell()
line = self.fp.readline()
if not line:
raise EOFError
if line[:5] == 'From ' and self._isrealfromline(line):
self.fp.seek(pos)
return
def _search_end(self):
self.fp.readline() # Throw away header line
while 1:
pos = self.fp.tell()
line = self.fp.readline()
if not line:
return
if line[:5] == 'From ' and self._isrealfromline(line):
self.fp.seek(pos)
return
# An overridable mechanism to test for From-line-ness. You can either
# specify a different regular expression or define a whole new
# _isrealfromline() method. Note that this only gets called for lines
# starting with the 5 characters "From ".
#
# BAW: According to
#http://home.netscape.com/eng/mozilla/2.0/relnotes/demo/content-length.html
# the only portable, reliable way to find message delimiters in a BSD (i.e
# Unix mailbox) style folder is to search for "\n\nFrom .*\n", or at the
# beginning of the file, "^From .*\n". While _fromlinepattern below seems
# like a good idea, in practice, there are too many variations for more
# strict parsing of the line to be completely accurate.
#
# _strict_isrealfromline() is the old version which tries to do stricter
# parsing of the From_ line. _portable_isrealfromline() simply returns
# true, since it's never called if the line doesn't already start with
# "From ".
#
# This algorithm, and the way it interacts with _search_start() and
# _search_end() may not be completely correct, because it doesn't check
# that the two characters preceding "From " are \n\n or the beginning of
# the file. Fixing this would require a more extensive rewrite than is
# necessary. For convenience, we've added a PortableUnixMailbox class
# which uses the more lenient _fromlinepattern regular expression.
_fromlinepattern = r"From \s*[^\s]+\s+\w\w\w\s+\w\w\w\s+\d?\d\s+" \
r"\d?\d:\d\d(:\d\d)?(\s+[^\s]+)?\s+\d\d\d\d\s*$"
_regexp = None
def _strict_isrealfromline(self, line):
if not self._regexp:
import re
self._regexp = re.compile(self._fromlinepattern)
return self._regexp.match(line)
def _portable_isrealfromline(self, line):
return True
_isrealfromline = _strict_isrealfromline
class PortableUnixMailbox(UnixMailbox):
_isrealfromline = UnixMailbox._portable_isrealfromline
class MmdfMailbox(_Mailbox):
def _search_start(self):
while 1:
line = self.fp.readline()
if not line:
raise EOFError
if line[:5] == '\001\001\001\001\n':
return
def _search_end(self):
while 1:
pos = self.fp.tell()
line = self.fp.readline()
if not line:
return
if line == '\001\001\001\001\n':
self.fp.seek(pos)
return
class MHMailbox:
def __init__(self, dirname, factory=rfc822.Message):
import re
pat = re.compile('^[1-9][0-9]*$')
self.dirname = dirname
# the three following lines could be combined into:
# list = map(long, filter(pat.match, os.listdir(self.dirname)))
list = os.listdir(self.dirname)
list = filter(pat.match, list)
list = map(long, list)
list.sort()
# This only works in Python 1.6 or later;
# before that str() added 'L':
self.boxes = map(str, list)
self.boxes.reverse()
self.factory = factory
def __iter__(self):
return iter(self.next, None)
def next(self):
if not self.boxes:
return None
fn = self.boxes.pop()
fp = open(os.path.join(self.dirname, fn))
msg = self.factory(fp)
try:
msg._mh_msgno = fn
except (AttributeError, TypeError):
pass
return msg
class Maildir:
# Qmail directory mailbox
def __init__(self, dirname, factory=rfc822.Message):
self.dirname = dirname
self.factory = factory
# check for new mail
newdir = os.path.join(self.dirname, 'new')
boxes = [os.path.join(newdir, f)
for f in os.listdir(newdir) if f[0] != '.']
# Now check for current mail in this maildir
curdir = os.path.join(self.dirname, 'cur')
boxes += [os.path.join(curdir, f)
for f in os.listdir(curdir) if f[0] != '.']
boxes.reverse()
self.boxes = boxes
def __iter__(self):
return iter(self.next, None)
def next(self):
if not self.boxes:
return None
fn = self.boxes.pop()
fp = open(fn)
return self.factory(fp)
class BabylMailbox(_Mailbox):
def _search_start(self):
while 1:
line = self.fp.readline()
if not line:
raise EOFError
if line == '*** EOOH ***\n':
return
def _search_end(self):
while 1:
pos = self.fp.tell()
line = self.fp.readline()
if not line:
return
if line == '\037\014\n' or line == '\037':
self.fp.seek(pos)
return
def _test():
import sys
args = sys.argv[1:]
if not args:
for key in 'MAILDIR', 'MAIL', 'LOGNAME', 'USER':
if key in os.environ:
mbox = os.environ[key]
break
else:
print "$MAIL, $LOGNAME nor $USER set -- who are you?"
return
else:
mbox = args[0]
if mbox[:1] == '+':
mbox = os.environ['HOME'] + '/Mail/' + mbox[1:]
elif not '/' in mbox:
if os.path.isfile('/var/mail/' + mbox):
mbox = '/var/mail/' + mbox
else:
mbox = '/usr/mail/' + mbox
if os.path.isdir(mbox):
if os.path.isdir(os.path.join(mbox, 'cur')):
mb = Maildir(mbox)
else:
mb = MHMailbox(mbox)
else:
fp = open(mbox, 'r')
mb = PortableUnixMailbox(fp)
msgs = []
while 1:
msg = mb.next()
if msg is None:
break
msgs.append(msg)
if len(args) <= 1:
msg.fp = None
if len(args) > 1:
num = int(args[1])
print 'Message %d body:'%num
msg = msgs[num-1]
msg.rewindbody()
sys.stdout.write(msg.fp.read())
else:
print 'Mailbox',mbox,'has',len(msgs),'messages:'
for msg in msgs:
f = msg.getheader('from') or ""
s = msg.getheader('subject') or ""
d = msg.getheader('date') or ""
print '-%20.20s %20.20s %-30.30s'%(f, d[5:], s)
if __name__ == '__main__':
_test()
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