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1012 lines
32 KiB
1012 lines
32 KiB
"""RFC 2822 message manipulation.
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Note: This is only a very rough sketch of a full RFC-822 parser; in particular
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the tokenizing of addresses does not adhere to all the quoting rules.
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Note: RFC 2822 is a long awaited update to RFC 822. This module should
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conform to RFC 2822, and is thus mis-named (it's not worth renaming it). Some
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effort at RFC 2822 updates have been made, but a thorough audit has not been
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performed. Consider any RFC 2822 non-conformance to be a bug.
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RFC 2822: http://www.faqs.org/rfcs/rfc2822.html
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RFC 822 : http://www.faqs.org/rfcs/rfc822.html (obsolete)
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Directions for use:
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To create a Message object: first open a file, e.g.:
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fp = open(file, 'r')
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You can use any other legal way of getting an open file object, e.g. use
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sys.stdin or call os.popen(). Then pass the open file object to the Message()
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constructor:
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m = Message(fp)
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This class can work with any input object that supports a readline method. If
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the input object has seek and tell capability, the rewindbody method will
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work; also illegal lines will be pushed back onto the input stream. If the
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input object lacks seek but has an `unread' method that can push back a line
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of input, Message will use that to push back illegal lines. Thus this class
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can be used to parse messages coming from a buffered stream.
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The optional `seekable' argument is provided as a workaround for certain stdio
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libraries in which tell() discards buffered data before discovering that the
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lseek() system call doesn't work. For maximum portability, you should set the
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seekable argument to zero to prevent that initial \code{tell} when passing in
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an unseekable object such as a file object created from a socket object. If
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it is 1 on entry -- which it is by default -- the tell() method of the open
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file object is called once; if this raises an exception, seekable is reset to
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0. For other nonzero values of seekable, this test is not made.
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To get the text of a particular header there are several methods:
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str = m.getheader(name)
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str = m.getrawheader(name)
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where name is the name of the header, e.g. 'Subject'. The difference is that
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getheader() strips the leading and trailing whitespace, while getrawheader()
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doesn't. Both functions retain embedded whitespace (including newlines)
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exactly as they are specified in the header, and leave the case of the text
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unchanged.
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For addresses and address lists there are functions
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realname, mailaddress = m.getaddr(name)
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list = m.getaddrlist(name)
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where the latter returns a list of (realname, mailaddr) tuples.
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There is also a method
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time = m.getdate(name)
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which parses a Date-like field and returns a time-compatible tuple,
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i.e. a tuple such as returned by time.localtime() or accepted by
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time.mktime().
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See the class definition for lower level access methods.
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There are also some utility functions here.
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"""
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# Cleanup and extensions by Eric S. Raymond <esr@thyrsus.com>
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import time
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from warnings import warnpy3k
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warnpy3k("in 3.x, rfc822 has been removed in favor of the email package",
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stacklevel=2)
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__all__ = ["Message","AddressList","parsedate","parsedate_tz","mktime_tz"]
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_blanklines = ('\r\n', '\n') # Optimization for islast()
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class Message:
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"""Represents a single RFC 2822-compliant message."""
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def __init__(self, fp, seekable = 1):
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"""Initialize the class instance and read the headers."""
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if seekable == 1:
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# Exercise tell() to make sure it works
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# (and then assume seek() works, too)
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try:
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fp.tell()
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except (AttributeError, IOError):
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seekable = 0
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self.fp = fp
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self.seekable = seekable
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self.startofheaders = None
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self.startofbody = None
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#
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if self.seekable:
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try:
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self.startofheaders = self.fp.tell()
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except IOError:
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self.seekable = 0
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#
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self.readheaders()
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#
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if self.seekable:
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try:
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self.startofbody = self.fp.tell()
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except IOError:
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self.seekable = 0
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def rewindbody(self):
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"""Rewind the file to the start of the body (if seekable)."""
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if not self.seekable:
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raise IOError, "unseekable file"
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self.fp.seek(self.startofbody)
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def readheaders(self):
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"""Read header lines.
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Read header lines up to the entirely blank line that terminates them.
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The (normally blank) line that ends the headers is skipped, but not
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included in the returned list. If a non-header line ends the headers,
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(which is an error), an attempt is made to backspace over it; it is
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never included in the returned list.
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The variable self.status is set to the empty string if all went well,
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otherwise it is an error message. The variable self.headers is a
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completely uninterpreted list of lines contained in the header (so
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printing them will reproduce the header exactly as it appears in the
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file).
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"""
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self.dict = {}
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self.unixfrom = ''
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self.headers = lst = []
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self.status = ''
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headerseen = ""
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firstline = 1
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startofline = unread = tell = None
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if hasattr(self.fp, 'unread'):
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unread = self.fp.unread
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elif self.seekable:
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tell = self.fp.tell
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while 1:
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if tell:
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try:
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startofline = tell()
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except IOError:
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startofline = tell = None
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self.seekable = 0
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line = self.fp.readline()
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if not line:
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self.status = 'EOF in headers'
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break
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# Skip unix From name time lines
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if firstline and line.startswith('From '):
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self.unixfrom = self.unixfrom + line
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continue
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firstline = 0
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if headerseen and line[0] in ' \t':
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# It's a continuation line.
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lst.append(line)
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x = (self.dict[headerseen] + "\n " + line.strip())
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self.dict[headerseen] = x.strip()
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continue
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elif self.iscomment(line):
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# It's a comment. Ignore it.
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continue
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elif self.islast(line):
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# Note! No pushback here! The delimiter line gets eaten.
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break
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headerseen = self.isheader(line)
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if headerseen:
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# It's a legal header line, save it.
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lst.append(line)
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self.dict[headerseen] = line[len(headerseen)+1:].strip()
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continue
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else:
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# It's not a header line; throw it back and stop here.
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if not self.dict:
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self.status = 'No headers'
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else:
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self.status = 'Non-header line where header expected'
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# Try to undo the read.
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if unread:
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unread(line)
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elif tell:
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self.fp.seek(startofline)
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else:
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self.status = self.status + '; bad seek'
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break
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def isheader(self, line):
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"""Determine whether a given line is a legal header.
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This method should return the header name, suitably canonicalized.
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You may override this method in order to use Message parsing on tagged
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data in RFC 2822-like formats with special header formats.
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"""
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i = line.find(':')
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if i > 0:
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return line[:i].lower()
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return None
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def islast(self, line):
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"""Determine whether a line is a legal end of RFC 2822 headers.
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You may override this method if your application wants to bend the
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rules, e.g. to strip trailing whitespace, or to recognize MH template
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separators ('--------'). For convenience (e.g. for code reading from
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sockets) a line consisting of \\r\\n also matches.
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"""
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return line in _blanklines
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def iscomment(self, line):
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"""Determine whether a line should be skipped entirely.
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You may override this method in order to use Message parsing on tagged
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data in RFC 2822-like formats that support embedded comments or
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free-text data.
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"""
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return False
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def getallmatchingheaders(self, name):
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"""Find all header lines matching a given header name.
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Look through the list of headers and find all lines matching a given
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header name (and their continuation lines). A list of the lines is
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returned, without interpretation. If the header does not occur, an
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empty list is returned. If the header occurs multiple times, all
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occurrences are returned. Case is not important in the header name.
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"""
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name = name.lower() + ':'
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n = len(name)
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lst = []
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hit = 0
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for line in self.headers:
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if line[:n].lower() == name:
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hit = 1
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elif not line[:1].isspace():
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hit = 0
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if hit:
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lst.append(line)
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return lst
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def getfirstmatchingheader(self, name):
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"""Get the first header line matching name.
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This is similar to getallmatchingheaders, but it returns only the
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first matching header (and its continuation lines).
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"""
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name = name.lower() + ':'
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n = len(name)
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lst = []
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hit = 0
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for line in self.headers:
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if hit:
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if not line[:1].isspace():
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break
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elif line[:n].lower() == name:
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hit = 1
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if hit:
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lst.append(line)
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return lst
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def getrawheader(self, name):
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"""A higher-level interface to getfirstmatchingheader().
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Return a string containing the literal text of the header but with the
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keyword stripped. All leading, trailing and embedded whitespace is
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kept in the string, however. Return None if the header does not
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occur.
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"""
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lst = self.getfirstmatchingheader(name)
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if not lst:
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return None
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lst[0] = lst[0][len(name) + 1:]
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return ''.join(lst)
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def getheader(self, name, default=None):
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"""Get the header value for a name.
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This is the normal interface: it returns a stripped version of the
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header value for a given header name, or None if it doesn't exist.
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This uses the dictionary version which finds the *last* such header.
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"""
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return self.dict.get(name.lower(), default)
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get = getheader
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def getheaders(self, name):
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"""Get all values for a header.
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This returns a list of values for headers given more than once; each
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value in the result list is stripped in the same way as the result of
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getheader(). If the header is not given, return an empty list.
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"""
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result = []
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current = ''
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have_header = 0
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for s in self.getallmatchingheaders(name):
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if s[0].isspace():
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if current:
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current = "%s\n %s" % (current, s.strip())
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else:
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current = s.strip()
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else:
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if have_header:
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result.append(current)
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current = s[s.find(":") + 1:].strip()
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have_header = 1
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if have_header:
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result.append(current)
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return result
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def getaddr(self, name):
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"""Get a single address from a header, as a tuple.
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An example return value:
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('Guido van Rossum', 'guido@cwi.nl')
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"""
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# New, by Ben Escoto
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alist = self.getaddrlist(name)
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if alist:
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return alist[0]
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else:
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return (None, None)
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def getaddrlist(self, name):
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"""Get a list of addresses from a header.
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Retrieves a list of addresses from a header, where each address is a
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tuple as returned by getaddr(). Scans all named headers, so it works
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properly with multiple To: or Cc: headers for example.
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"""
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raw = []
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for h in self.getallmatchingheaders(name):
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if h[0] in ' \t':
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raw.append(h)
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else:
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if raw:
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raw.append(', ')
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i = h.find(':')
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if i > 0:
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addr = h[i+1:]
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raw.append(addr)
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alladdrs = ''.join(raw)
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a = AddressList(alladdrs)
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return a.addresslist
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def getdate(self, name):
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"""Retrieve a date field from a header.
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Retrieves a date field from the named header, returning a tuple
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compatible with time.mktime().
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"""
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try:
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data = self[name]
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except KeyError:
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return None
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return parsedate(data)
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def getdate_tz(self, name):
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"""Retrieve a date field from a header as a 10-tuple.
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The first 9 elements make up a tuple compatible with time.mktime(),
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and the 10th is the offset of the poster's time zone from GMT/UTC.
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"""
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try:
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data = self[name]
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except KeyError:
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return None
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return parsedate_tz(data)
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|
|
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# Access as a dictionary (only finds *last* header of each type):
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def __len__(self):
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"""Get the number of headers in a message."""
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return len(self.dict)
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def __getitem__(self, name):
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"""Get a specific header, as from a dictionary."""
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return self.dict[name.lower()]
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def __setitem__(self, name, value):
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"""Set the value of a header.
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|
Note: This is not a perfect inversion of __getitem__, because any
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changed headers get stuck at the end of the raw-headers list rather
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than where the altered header was.
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"""
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del self[name] # Won't fail if it doesn't exist
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self.dict[name.lower()] = value
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text = name + ": " + value
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for line in text.split("\n"):
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self.headers.append(line + "\n")
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def __delitem__(self, name):
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"""Delete all occurrences of a specific header, if it is present."""
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name = name.lower()
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if not name in self.dict:
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return
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del self.dict[name]
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name = name + ':'
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n = len(name)
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lst = []
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hit = 0
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for i in range(len(self.headers)):
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line = self.headers[i]
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if line[:n].lower() == name:
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hit = 1
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elif not line[:1].isspace():
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hit = 0
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if hit:
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lst.append(i)
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for i in reversed(lst):
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del self.headers[i]
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|
|
def setdefault(self, name, default=""):
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lowername = name.lower()
|
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if lowername in self.dict:
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return self.dict[lowername]
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else:
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text = name + ": " + default
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for line in text.split("\n"):
|
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self.headers.append(line + "\n")
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self.dict[lowername] = default
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return default
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|
|
def has_key(self, name):
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"""Determine whether a message contains the named header."""
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return name.lower() in self.dict
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|
|
def __contains__(self, name):
|
|
"""Determine whether a message contains the named header."""
|
|
return name.lower() in self.dict
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|
|
|
def __iter__(self):
|
|
return iter(self.dict)
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|
|
|
def keys(self):
|
|
"""Get all of a message's header field names."""
|
|
return self.dict.keys()
|
|
|
|
def values(self):
|
|
"""Get all of a message's header field values."""
|
|
return self.dict.values()
|
|
|
|
def items(self):
|
|
"""Get all of a message's headers.
|
|
|
|
Returns a list of name, value tuples.
|
|
"""
|
|
return self.dict.items()
|
|
|
|
def __str__(self):
|
|
return ''.join(self.headers)
|
|
|
|
|
|
# Utility functions
|
|
# -----------------
|
|
|
|
# XXX Should fix unquote() and quote() to be really conformant.
|
|
# XXX The inverses of the parse functions may also be useful.
|
|
|
|
|
|
def unquote(s):
|
|
"""Remove quotes from a string."""
|
|
if len(s) > 1:
|
|
if s.startswith('"') and s.endswith('"'):
|
|
return s[1:-1].replace('\\\\', '\\').replace('\\"', '"')
|
|
if s.startswith('<') and s.endswith('>'):
|
|
return s[1:-1]
|
|
return s
|
|
|
|
|
|
def quote(s):
|
|
"""Add quotes around a string."""
|
|
return s.replace('\\', '\\\\').replace('"', '\\"')
|
|
|
|
|
|
def parseaddr(address):
|
|
"""Parse an address into a (realname, mailaddr) tuple."""
|
|
a = AddressList(address)
|
|
lst = a.addresslist
|
|
if not lst:
|
|
return (None, None)
|
|
return lst[0]
|
|
|
|
|
|
class AddrlistClass:
|
|
"""Address parser class by Ben Escoto.
|
|
|
|
To understand what this class does, it helps to have a copy of
|
|
RFC 2822 in front of you.
|
|
|
|
http://www.faqs.org/rfcs/rfc2822.html
|
|
|
|
Note: this class interface is deprecated and may be removed in the future.
|
|
Use rfc822.AddressList instead.
|
|
"""
|
|
|
|
def __init__(self, field):
|
|
"""Initialize a new instance.
|
|
|
|
`field' is an unparsed address header field, containing one or more
|
|
addresses.
|
|
"""
|
|
self.specials = '()<>@,:;.\"[]'
|
|
self.pos = 0
|
|
self.LWS = ' \t'
|
|
self.CR = '\r\n'
|
|
self.atomends = self.specials + self.LWS + self.CR
|
|
# Note that RFC 2822 now specifies `.' as obs-phrase, meaning that it
|
|
# is obsolete syntax. RFC 2822 requires that we recognize obsolete
|
|
# syntax, so allow dots in phrases.
|
|
self.phraseends = self.atomends.replace('.', '')
|
|
self.field = field
|
|
self.commentlist = []
|
|
|
|
def gotonext(self):
|
|
"""Parse up to the start of the next address."""
|
|
while self.pos < len(self.field):
|
|
if self.field[self.pos] in self.LWS + '\n\r':
|
|
self.pos = self.pos + 1
|
|
elif self.field[self.pos] == '(':
|
|
self.commentlist.append(self.getcomment())
|
|
else: break
|
|
|
|
def getaddrlist(self):
|
|
"""Parse all addresses.
|
|
|
|
Returns a list containing all of the addresses.
|
|
"""
|
|
result = []
|
|
ad = self.getaddress()
|
|
while ad:
|
|
result += ad
|
|
ad = self.getaddress()
|
|
return result
|
|
|
|
def getaddress(self):
|
|
"""Parse the next address."""
|
|
self.commentlist = []
|
|
self.gotonext()
|
|
|
|
oldpos = self.pos
|
|
oldcl = self.commentlist
|
|
plist = self.getphraselist()
|
|
|
|
self.gotonext()
|
|
returnlist = []
|
|
|
|
if self.pos >= len(self.field):
|
|
# Bad email address technically, no domain.
|
|
if plist:
|
|
returnlist = [(' '.join(self.commentlist), plist[0])]
|
|
|
|
elif self.field[self.pos] in '.@':
|
|
# email address is just an addrspec
|
|
# this isn't very efficient since we start over
|
|
self.pos = oldpos
|
|
self.commentlist = oldcl
|
|
addrspec = self.getaddrspec()
|
|
returnlist = [(' '.join(self.commentlist), addrspec)]
|
|
|
|
elif self.field[self.pos] == ':':
|
|
# address is a group
|
|
returnlist = []
|
|
|
|
fieldlen = len(self.field)
|
|
self.pos += 1
|
|
while self.pos < len(self.field):
|
|
self.gotonext()
|
|
if self.pos < fieldlen and self.field[self.pos] == ';':
|
|
self.pos += 1
|
|
break
|
|
returnlist = returnlist + self.getaddress()
|
|
|
|
elif self.field[self.pos] == '<':
|
|
# Address is a phrase then a route addr
|
|
routeaddr = self.getrouteaddr()
|
|
|
|
if self.commentlist:
|
|
returnlist = [(' '.join(plist) + ' (' + \
|
|
' '.join(self.commentlist) + ')', routeaddr)]
|
|
else: returnlist = [(' '.join(plist), routeaddr)]
|
|
|
|
else:
|
|
if plist:
|
|
returnlist = [(' '.join(self.commentlist), plist[0])]
|
|
elif self.field[self.pos] in self.specials:
|
|
self.pos += 1
|
|
|
|
self.gotonext()
|
|
if self.pos < len(self.field) and self.field[self.pos] == ',':
|
|
self.pos += 1
|
|
return returnlist
|
|
|
|
def getrouteaddr(self):
|
|
"""Parse a route address (Return-path value).
|
|
|
|
This method just skips all the route stuff and returns the addrspec.
|
|
"""
|
|
if self.field[self.pos] != '<':
|
|
return
|
|
|
|
expectroute = 0
|
|
self.pos += 1
|
|
self.gotonext()
|
|
adlist = ""
|
|
while self.pos < len(self.field):
|
|
if expectroute:
|
|
self.getdomain()
|
|
expectroute = 0
|
|
elif self.field[self.pos] == '>':
|
|
self.pos += 1
|
|
break
|
|
elif self.field[self.pos] == '@':
|
|
self.pos += 1
|
|
expectroute = 1
|
|
elif self.field[self.pos] == ':':
|
|
self.pos += 1
|
|
else:
|
|
adlist = self.getaddrspec()
|
|
self.pos += 1
|
|
break
|
|
self.gotonext()
|
|
|
|
return adlist
|
|
|
|
def getaddrspec(self):
|
|
"""Parse an RFC 2822 addr-spec."""
|
|
aslist = []
|
|
|
|
self.gotonext()
|
|
while self.pos < len(self.field):
|
|
if self.field[self.pos] == '.':
|
|
aslist.append('.')
|
|
self.pos += 1
|
|
elif self.field[self.pos] == '"':
|
|
aslist.append('"%s"' % self.getquote())
|
|
elif self.field[self.pos] in self.atomends:
|
|
break
|
|
else: aslist.append(self.getatom())
|
|
self.gotonext()
|
|
|
|
if self.pos >= len(self.field) or self.field[self.pos] != '@':
|
|
return ''.join(aslist)
|
|
|
|
aslist.append('@')
|
|
self.pos += 1
|
|
self.gotonext()
|
|
return ''.join(aslist) + self.getdomain()
|
|
|
|
def getdomain(self):
|
|
"""Get the complete domain name from an address."""
|
|
sdlist = []
|
|
while self.pos < len(self.field):
|
|
if self.field[self.pos] in self.LWS:
|
|
self.pos += 1
|
|
elif self.field[self.pos] == '(':
|
|
self.commentlist.append(self.getcomment())
|
|
elif self.field[self.pos] == '[':
|
|
sdlist.append(self.getdomainliteral())
|
|
elif self.field[self.pos] == '.':
|
|
self.pos += 1
|
|
sdlist.append('.')
|
|
elif self.field[self.pos] in self.atomends:
|
|
break
|
|
else: sdlist.append(self.getatom())
|
|
return ''.join(sdlist)
|
|
|
|
def getdelimited(self, beginchar, endchars, allowcomments = 1):
|
|
"""Parse a header fragment delimited by special characters.
|
|
|
|
`beginchar' is the start character for the fragment. If self is not
|
|
looking at an instance of `beginchar' then getdelimited returns the
|
|
empty string.
|
|
|
|
`endchars' is a sequence of allowable end-delimiting characters.
|
|
Parsing stops when one of these is encountered.
|
|
|
|
If `allowcomments' is non-zero, embedded RFC 2822 comments are allowed
|
|
within the parsed fragment.
|
|
"""
|
|
if self.field[self.pos] != beginchar:
|
|
return ''
|
|
|
|
slist = ['']
|
|
quote = 0
|
|
self.pos += 1
|
|
while self.pos < len(self.field):
|
|
if quote == 1:
|
|
slist.append(self.field[self.pos])
|
|
quote = 0
|
|
elif self.field[self.pos] in endchars:
|
|
self.pos += 1
|
|
break
|
|
elif allowcomments and self.field[self.pos] == '(':
|
|
slist.append(self.getcomment())
|
|
continue # have already advanced pos from getcomment
|
|
elif self.field[self.pos] == '\\':
|
|
quote = 1
|
|
else:
|
|
slist.append(self.field[self.pos])
|
|
self.pos += 1
|
|
|
|
return ''.join(slist)
|
|
|
|
def getquote(self):
|
|
"""Get a quote-delimited fragment from self's field."""
|
|
return self.getdelimited('"', '"\r', 0)
|
|
|
|
def getcomment(self):
|
|
"""Get a parenthesis-delimited fragment from self's field."""
|
|
return self.getdelimited('(', ')\r', 1)
|
|
|
|
def getdomainliteral(self):
|
|
"""Parse an RFC 2822 domain-literal."""
|
|
return '[%s]' % self.getdelimited('[', ']\r', 0)
|
|
|
|
def getatom(self, atomends=None):
|
|
"""Parse an RFC 2822 atom.
|
|
|
|
Optional atomends specifies a different set of end token delimiters
|
|
(the default is to use self.atomends). This is used e.g. in
|
|
getphraselist() since phrase endings must not include the `.' (which
|
|
is legal in phrases)."""
|
|
atomlist = ['']
|
|
if atomends is None:
|
|
atomends = self.atomends
|
|
|
|
while self.pos < len(self.field):
|
|
if self.field[self.pos] in atomends:
|
|
break
|
|
else: atomlist.append(self.field[self.pos])
|
|
self.pos += 1
|
|
|
|
return ''.join(atomlist)
|
|
|
|
def getphraselist(self):
|
|
"""Parse a sequence of RFC 2822 phrases.
|
|
|
|
A phrase is a sequence of words, which are in turn either RFC 2822
|
|
atoms or quoted-strings. Phrases are canonicalized by squeezing all
|
|
runs of continuous whitespace into one space.
|
|
"""
|
|
plist = []
|
|
|
|
while self.pos < len(self.field):
|
|
if self.field[self.pos] in self.LWS:
|
|
self.pos += 1
|
|
elif self.field[self.pos] == '"':
|
|
plist.append(self.getquote())
|
|
elif self.field[self.pos] == '(':
|
|
self.commentlist.append(self.getcomment())
|
|
elif self.field[self.pos] in self.phraseends:
|
|
break
|
|
else:
|
|
plist.append(self.getatom(self.phraseends))
|
|
|
|
return plist
|
|
|
|
class AddressList(AddrlistClass):
|
|
"""An AddressList encapsulates a list of parsed RFC 2822 addresses."""
|
|
def __init__(self, field):
|
|
AddrlistClass.__init__(self, field)
|
|
if field:
|
|
self.addresslist = self.getaddrlist()
|
|
else:
|
|
self.addresslist = []
|
|
|
|
def __len__(self):
|
|
return len(self.addresslist)
|
|
|
|
def __str__(self):
|
|
return ", ".join(map(dump_address_pair, self.addresslist))
|
|
|
|
def __add__(self, other):
|
|
# Set union
|
|
newaddr = AddressList(None)
|
|
newaddr.addresslist = self.addresslist[:]
|
|
for x in other.addresslist:
|
|
if not x in self.addresslist:
|
|
newaddr.addresslist.append(x)
|
|
return newaddr
|
|
|
|
def __iadd__(self, other):
|
|
# Set union, in-place
|
|
for x in other.addresslist:
|
|
if not x in self.addresslist:
|
|
self.addresslist.append(x)
|
|
return self
|
|
|
|
def __sub__(self, other):
|
|
# Set difference
|
|
newaddr = AddressList(None)
|
|
for x in self.addresslist:
|
|
if not x in other.addresslist:
|
|
newaddr.addresslist.append(x)
|
|
return newaddr
|
|
|
|
def __isub__(self, other):
|
|
# Set difference, in-place
|
|
for x in other.addresslist:
|
|
if x in self.addresslist:
|
|
self.addresslist.remove(x)
|
|
return self
|
|
|
|
def __getitem__(self, index):
|
|
# Make indexing, slices, and 'in' work
|
|
return self.addresslist[index]
|
|
|
|
def dump_address_pair(pair):
|
|
"""Dump a (name, address) pair in a canonicalized form."""
|
|
if pair[0]:
|
|
return '"' + pair[0] + '" <' + pair[1] + '>'
|
|
else:
|
|
return pair[1]
|
|
|
|
# Parse a date field
|
|
|
|
_monthnames = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul',
|
|
'aug', 'sep', 'oct', 'nov', 'dec',
|
|
'january', 'february', 'march', 'april', 'may', 'june', 'july',
|
|
'august', 'september', 'october', 'november', 'december']
|
|
_daynames = ['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun']
|
|
|
|
# The timezone table does not include the military time zones defined
|
|
# in RFC822, other than Z. According to RFC1123, the description in
|
|
# RFC822 gets the signs wrong, so we can't rely on any such time
|
|
# zones. RFC1123 recommends that numeric timezone indicators be used
|
|
# instead of timezone names.
|
|
|
|
_timezones = {'UT':0, 'UTC':0, 'GMT':0, 'Z':0,
|
|
'AST': -400, 'ADT': -300, # Atlantic (used in Canada)
|
|
'EST': -500, 'EDT': -400, # Eastern
|
|
'CST': -600, 'CDT': -500, # Central
|
|
'MST': -700, 'MDT': -600, # Mountain
|
|
'PST': -800, 'PDT': -700 # Pacific
|
|
}
|
|
|
|
|
|
def parsedate_tz(data):
|
|
"""Convert a date string to a time tuple.
|
|
|
|
Accounts for military timezones.
|
|
"""
|
|
if not data:
|
|
return None
|
|
data = data.split()
|
|
if data[0][-1] in (',', '.') or data[0].lower() in _daynames:
|
|
# There's a dayname here. Skip it
|
|
del data[0]
|
|
else:
|
|
# no space after the "weekday,"?
|
|
i = data[0].rfind(',')
|
|
if i >= 0:
|
|
data[0] = data[0][i+1:]
|
|
if len(data) == 3: # RFC 850 date, deprecated
|
|
stuff = data[0].split('-')
|
|
if len(stuff) == 3:
|
|
data = stuff + data[1:]
|
|
if len(data) == 4:
|
|
s = data[3]
|
|
i = s.find('+')
|
|
if i > 0:
|
|
data[3:] = [s[:i], s[i+1:]]
|
|
else:
|
|
data.append('') # Dummy tz
|
|
if len(data) < 5:
|
|
return None
|
|
data = data[:5]
|
|
[dd, mm, yy, tm, tz] = data
|
|
mm = mm.lower()
|
|
if not mm in _monthnames:
|
|
dd, mm = mm, dd.lower()
|
|
if not mm in _monthnames:
|
|
return None
|
|
mm = _monthnames.index(mm)+1
|
|
if mm > 12: mm = mm - 12
|
|
if dd[-1] == ',':
|
|
dd = dd[:-1]
|
|
i = yy.find(':')
|
|
if i > 0:
|
|
yy, tm = tm, yy
|
|
if yy[-1] == ',':
|
|
yy = yy[:-1]
|
|
if not yy[0].isdigit():
|
|
yy, tz = tz, yy
|
|
if tm[-1] == ',':
|
|
tm = tm[:-1]
|
|
tm = tm.split(':')
|
|
if len(tm) == 2:
|
|
[thh, tmm] = tm
|
|
tss = '0'
|
|
elif len(tm) == 3:
|
|
[thh, tmm, tss] = tm
|
|
else:
|
|
return None
|
|
try:
|
|
yy = int(yy)
|
|
dd = int(dd)
|
|
thh = int(thh)
|
|
tmm = int(tmm)
|
|
tss = int(tss)
|
|
except ValueError:
|
|
return None
|
|
tzoffset = None
|
|
tz = tz.upper()
|
|
if tz in _timezones:
|
|
tzoffset = _timezones[tz]
|
|
else:
|
|
try:
|
|
tzoffset = int(tz)
|
|
except ValueError:
|
|
pass
|
|
# Convert a timezone offset into seconds ; -0500 -> -18000
|
|
if tzoffset:
|
|
if tzoffset < 0:
|
|
tzsign = -1
|
|
tzoffset = -tzoffset
|
|
else:
|
|
tzsign = 1
|
|
tzoffset = tzsign * ( (tzoffset//100)*3600 + (tzoffset % 100)*60)
|
|
return (yy, mm, dd, thh, tmm, tss, 0, 1, 0, tzoffset)
|
|
|
|
|
|
def parsedate(data):
|
|
"""Convert a time string to a time tuple."""
|
|
t = parsedate_tz(data)
|
|
if t is None:
|
|
return t
|
|
return t[:9]
|
|
|
|
|
|
def mktime_tz(data):
|
|
"""Turn a 10-tuple as returned by parsedate_tz() into a UTC timestamp."""
|
|
if data[9] is None:
|
|
# No zone info, so localtime is better assumption than GMT
|
|
return time.mktime(data[:8] + (-1,))
|
|
else:
|
|
t = time.mktime(data[:8] + (0,))
|
|
return t - data[9] - time.timezone
|
|
|
|
def formatdate(timeval=None):
|
|
"""Returns time format preferred for Internet standards.
|
|
|
|
Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
|
|
|
|
According to RFC 1123, day and month names must always be in
|
|
English. If not for that, this code could use strftime(). It
|
|
can't because strftime() honors the locale and could generated
|
|
non-English names.
|
|
"""
|
|
if timeval is None:
|
|
timeval = time.time()
|
|
timeval = time.gmtime(timeval)
|
|
return "%s, %02d %s %04d %02d:%02d:%02d GMT" % (
|
|
("Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun")[timeval[6]],
|
|
timeval[2],
|
|
("Jan", "Feb", "Mar", "Apr", "May", "Jun",
|
|
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec")[timeval[1]-1],
|
|
timeval[0], timeval[3], timeval[4], timeval[5])
|
|
|
|
|
|
# When used as script, run a small test program.
|
|
# The first command line argument must be a filename containing one
|
|
# message in RFC-822 format.
|
|
|
|
if __name__ == '__main__':
|
|
import sys, os
|
|
file = os.path.join(os.environ['HOME'], 'Mail/inbox/1')
|
|
if sys.argv[1:]: file = sys.argv[1]
|
|
f = open(file, 'r')
|
|
m = Message(f)
|
|
print 'From:', m.getaddr('from')
|
|
print 'To:', m.getaddrlist('to')
|
|
print 'Subject:', m.getheader('subject')
|
|
print 'Date:', m.getheader('date')
|
|
date = m.getdate_tz('date')
|
|
tz = date[-1]
|
|
date = time.localtime(mktime_tz(date))
|
|
if date:
|
|
print 'ParsedDate:', time.asctime(date),
|
|
hhmmss = tz
|
|
hhmm, ss = divmod(hhmmss, 60)
|
|
hh, mm = divmod(hhmm, 60)
|
|
print "%+03d%02d" % (hh, mm),
|
|
if ss: print ".%02d" % ss,
|
|
print
|
|
else:
|
|
print 'ParsedDate:', None
|
|
m.rewindbody()
|
|
n = 0
|
|
while f.readline():
|
|
n += 1
|
|
print 'Lines:', n
|
|
print '-'*70
|
|
print 'len =', len(m)
|
|
if 'Date' in m: print 'Date =', m['Date']
|
|
if 'X-Nonsense' in m: pass
|
|
print 'keys =', m.keys()
|
|
print 'values =', m.values()
|
|
print 'items =', m.items()
|