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4bf1254342
attribute to the (stringized) message number (if this attribute is settable). This is useful so users of this class can report the correct message number (e.g. when classifying spam). Also added a blank line before the first method of each class.
326 lines
9.2 KiB
Python
Executable File
326 lines
9.2 KiB
Python
Executable File
#! /usr/bin/env python
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"""Classes to handle Unix style, MMDF style, and MH style mailboxes."""
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import rfc822
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import os
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__all__ = ["UnixMailbox","MmdfMailbox","MHMailbox","Maildir","BabylMailbox",
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"PortableUnixMailbox"]
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class _Mailbox:
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def __init__(self, fp, factory=rfc822.Message):
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self.fp = fp
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self.seekp = 0
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self.factory = factory
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def __iter__(self):
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return iter(self.next, None)
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def next(self):
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while 1:
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self.fp.seek(self.seekp)
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try:
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self._search_start()
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except EOFError:
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self.seekp = self.fp.tell()
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return None
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start = self.fp.tell()
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self._search_end()
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self.seekp = stop = self.fp.tell()
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if start != stop:
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break
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return self.factory(_Subfile(self.fp, start, stop))
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class _Subfile:
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def __init__(self, fp, start, stop):
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self.fp = fp
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self.start = start
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self.stop = stop
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self.pos = self.start
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def read(self, length = None):
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if self.pos >= self.stop:
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return ''
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remaining = self.stop - self.pos
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if length is None or length < 0:
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length = remaining
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elif length > remaining:
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length = remaining
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self.fp.seek(self.pos)
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data = self.fp.read(length)
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self.pos = self.fp.tell()
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return data
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def readline(self, length = None):
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if self.pos >= self.stop:
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return ''
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if length is None:
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length = self.stop - self.pos
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self.fp.seek(self.pos)
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data = self.fp.readline(length)
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self.pos = self.fp.tell()
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return data
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def readlines(self, sizehint = -1):
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lines = []
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while 1:
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line = self.readline()
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if not line:
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break
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lines.append(line)
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if sizehint >= 0:
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sizehint = sizehint - len(line)
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if sizehint <= 0:
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break
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return lines
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def tell(self):
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return self.pos - self.start
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def seek(self, pos, whence=0):
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if whence == 0:
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self.pos = self.start + pos
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elif whence == 1:
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self.pos = self.pos + pos
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elif whence == 2:
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self.pos = self.stop + pos
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def close(self):
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del self.fp
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# Recommended to use PortableUnixMailbox instead!
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class UnixMailbox(_Mailbox):
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def _search_start(self):
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while 1:
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pos = self.fp.tell()
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line = self.fp.readline()
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if not line:
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raise EOFError
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if line[:5] == 'From ' and self._isrealfromline(line):
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self.fp.seek(pos)
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return
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def _search_end(self):
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self.fp.readline() # Throw away header line
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while 1:
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pos = self.fp.tell()
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line = self.fp.readline()
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if not line:
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return
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if line[:5] == 'From ' and self._isrealfromline(line):
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self.fp.seek(pos)
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return
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# An overridable mechanism to test for From-line-ness. You can either
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# specify a different regular expression or define a whole new
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# _isrealfromline() method. Note that this only gets called for lines
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# starting with the 5 characters "From ".
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#
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# BAW: According to
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#http://home.netscape.com/eng/mozilla/2.0/relnotes/demo/content-length.html
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# the only portable, reliable way to find message delimiters in a BSD (i.e
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# Unix mailbox) style folder is to search for "\n\nFrom .*\n", or at the
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# beginning of the file, "^From .*\n". While _fromlinepattern below seems
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# like a good idea, in practice, there are too many variations for more
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# strict parsing of the line to be completely accurate.
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#
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# _strict_isrealfromline() is the old version which tries to do stricter
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# parsing of the From_ line. _portable_isrealfromline() simply returns
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# true, since it's never called if the line doesn't already start with
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# "From ".
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#
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# This algorithm, and the way it interacts with _search_start() and
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# _search_end() may not be completely correct, because it doesn't check
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# that the two characters preceding "From " are \n\n or the beginning of
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# the file. Fixing this would require a more extensive rewrite than is
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# necessary. For convenience, we've added a PortableUnixMailbox class
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# which uses the more lenient _fromlinepattern regular expression.
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_fromlinepattern = r"From \s*[^\s]+\s+\w\w\w\s+\w\w\w\s+\d?\d\s+" \
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r"\d?\d:\d\d(:\d\d)?(\s+[^\s]+)?\s+\d\d\d\d\s*$"
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_regexp = None
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def _strict_isrealfromline(self, line):
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if not self._regexp:
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import re
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self._regexp = re.compile(self._fromlinepattern)
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return self._regexp.match(line)
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def _portable_isrealfromline(self, line):
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return True
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_isrealfromline = _strict_isrealfromline
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class PortableUnixMailbox(UnixMailbox):
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_isrealfromline = UnixMailbox._portable_isrealfromline
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class MmdfMailbox(_Mailbox):
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def _search_start(self):
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while 1:
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line = self.fp.readline()
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if not line:
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raise EOFError
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if line[:5] == '\001\001\001\001\n':
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return
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def _search_end(self):
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while 1:
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pos = self.fp.tell()
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line = self.fp.readline()
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if not line:
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return
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if line == '\001\001\001\001\n':
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self.fp.seek(pos)
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return
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class MHMailbox:
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def __init__(self, dirname, factory=rfc822.Message):
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import re
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pat = re.compile('^[1-9][0-9]*$')
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self.dirname = dirname
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# the three following lines could be combined into:
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# list = map(long, filter(pat.match, os.listdir(self.dirname)))
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list = os.listdir(self.dirname)
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list = filter(pat.match, list)
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list = map(long, list)
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list.sort()
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# This only works in Python 1.6 or later;
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# before that str() added 'L':
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self.boxes = map(str, list)
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self.factory = factory
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def __iter__(self):
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return iter(self.next, None)
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def next(self):
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if not self.boxes:
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return None
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fn = self.boxes.pop(0)
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fp = open(os.path.join(self.dirname, fn))
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msg = self.factory(fp)
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try:
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msg._mh_msgno = fn
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except (AttributeError, TypeError):
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pass
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return msg
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class Maildir:
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# Qmail directory mailbox
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def __init__(self, dirname, factory=rfc822.Message):
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self.dirname = dirname
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self.factory = factory
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# check for new mail
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newdir = os.path.join(self.dirname, 'new')
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boxes = [os.path.join(newdir, f)
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for f in os.listdir(newdir) if f[0] != '.']
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# Now check for current mail in this maildir
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curdir = os.path.join(self.dirname, 'cur')
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boxes += [os.path.join(curdir, f)
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for f in os.listdir(curdir) if f[0] != '.']
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self.boxes = boxes
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def __iter__(self):
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return iter(self.next, None)
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def next(self):
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if not self.boxes:
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return None
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fn = self.boxes.pop(0)
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fp = open(fn)
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return self.factory(fp)
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class BabylMailbox(_Mailbox):
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def _search_start(self):
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while 1:
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line = self.fp.readline()
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if not line:
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raise EOFError
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if line == '*** EOOH ***\n':
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return
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def _search_end(self):
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while 1:
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pos = self.fp.tell()
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line = self.fp.readline()
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if not line:
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return
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if line == '\037\014\n':
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self.fp.seek(pos)
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return
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def _test():
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import sys
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args = sys.argv[1:]
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if not args:
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for key in 'MAILDIR', 'MAIL', 'LOGNAME', 'USER':
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if key in os.environ:
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mbox = os.environ[key]
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break
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else:
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print "$MAIL, $LOGNAME nor $USER set -- who are you?"
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return
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else:
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mbox = args[0]
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if mbox[:1] == '+':
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mbox = os.environ['HOME'] + '/Mail/' + mbox[1:]
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elif not '/' in mbox:
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if os.path.isfile('/var/mail/' + mbox):
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mbox = '/var/mail/' + mbox
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else:
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mbox = '/usr/mail/' + mbox
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if os.path.isdir(mbox):
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if os.path.isdir(os.path.join(mbox, 'cur')):
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mb = Maildir(mbox)
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else:
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mb = MHMailbox(mbox)
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else:
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fp = open(mbox, 'r')
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mb = PortableUnixMailbox(fp)
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msgs = []
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while 1:
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msg = mb.next()
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if msg is None:
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break
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msgs.append(msg)
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if len(args) <= 1:
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msg.fp = None
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if len(args) > 1:
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num = int(args[1])
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print 'Message %d body:'%num
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msg = msgs[num-1]
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msg.rewindbody()
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sys.stdout.write(msg.fp.read())
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else:
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print 'Mailbox',mbox,'has',len(msgs),'messages:'
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for msg in msgs:
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f = msg.getheader('from') or ""
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s = msg.getheader('subject') or ""
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d = msg.getheader('date') or ""
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print '-%20.20s %20.20s %-30.30s'%(f, d[5:], s)
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if __name__ == '__main__':
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_test()
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