1007 lines
32 KiB
Python
1007 lines
32 KiB
Python
"""RFC 2822 message manipulation.
|
|
|
|
Note: This is only a very rough sketch of a full RFC-822 parser; in particular
|
|
the tokenizing of addresses does not adhere to all the quoting rules.
|
|
|
|
Note: RFC 2822 is a long awaited update to RFC 822. This module should
|
|
conform to RFC 2822, and is thus mis-named (it's not worth renaming it). Some
|
|
effort at RFC 2822 updates have been made, but a thorough audit has not been
|
|
performed. Consider any RFC 2822 non-conformance to be a bug.
|
|
|
|
RFC 2822: http://www.faqs.org/rfcs/rfc2822.html
|
|
RFC 822 : http://www.faqs.org/rfcs/rfc822.html (obsolete)
|
|
|
|
Directions for use:
|
|
|
|
To create a Message object: first open a file, e.g.:
|
|
|
|
fp = open(file, 'r')
|
|
|
|
You can use any other legal way of getting an open file object, e.g. use
|
|
sys.stdin or call os.popen(). Then pass the open file object to the Message()
|
|
constructor:
|
|
|
|
m = Message(fp)
|
|
|
|
This class can work with any input object that supports a readline method. If
|
|
the input object has seek and tell capability, the rewindbody method will
|
|
work; also illegal lines will be pushed back onto the input stream. If the
|
|
input object lacks seek but has an `unread' method that can push back a line
|
|
of input, Message will use that to push back illegal lines. Thus this class
|
|
can be used to parse messages coming from a buffered stream.
|
|
|
|
The optional `seekable' argument is provided as a workaround for certain stdio
|
|
libraries in which tell() discards buffered data before discovering that the
|
|
lseek() system call doesn't work. For maximum portability, you should set the
|
|
seekable argument to zero to prevent that initial \code{tell} when passing in
|
|
an unseekable object such as a a file object created from a socket object. If
|
|
it is 1 on entry -- which it is by default -- the tell() method of the open
|
|
file object is called once; if this raises an exception, seekable is reset to
|
|
0. For other nonzero values of seekable, this test is not made.
|
|
|
|
To get the text of a particular header there are several methods:
|
|
|
|
str = m.getheader(name)
|
|
str = m.getrawheader(name)
|
|
|
|
where name is the name of the header, e.g. 'Subject'. The difference is that
|
|
getheader() strips the leading and trailing whitespace, while getrawheader()
|
|
doesn't. Both functions retain embedded whitespace (including newlines)
|
|
exactly as they are specified in the header, and leave the case of the text
|
|
unchanged.
|
|
|
|
For addresses and address lists there are functions
|
|
|
|
realname, mailaddress = m.getaddr(name)
|
|
list = m.getaddrlist(name)
|
|
|
|
where the latter returns a list of (realname, mailaddr) tuples.
|
|
|
|
There is also a method
|
|
|
|
time = m.getdate(name)
|
|
|
|
which parses a Date-like field and returns a time-compatible tuple,
|
|
i.e. a tuple such as returned by time.localtime() or accepted by
|
|
time.mktime().
|
|
|
|
See the class definition for lower level access methods.
|
|
|
|
There are also some utility functions here.
|
|
"""
|
|
# Cleanup and extensions by Eric S. Raymond <esr@thyrsus.com>
|
|
|
|
import time
|
|
|
|
__all__ = ["Message","AddressList","parsedate","parsedate_tz","mktime_tz"]
|
|
|
|
_blanklines = ('\r\n', '\n') # Optimization for islast()
|
|
|
|
|
|
class Message:
|
|
"""Represents a single RFC 2822-compliant message."""
|
|
|
|
def __init__(self, fp, seekable = 1):
|
|
"""Initialize the class instance and read the headers."""
|
|
if seekable == 1:
|
|
# Exercise tell() to make sure it works
|
|
# (and then assume seek() works, too)
|
|
try:
|
|
fp.tell()
|
|
except (AttributeError, IOError):
|
|
seekable = 0
|
|
self.fp = fp
|
|
self.seekable = seekable
|
|
self.startofheaders = None
|
|
self.startofbody = None
|
|
#
|
|
if self.seekable:
|
|
try:
|
|
self.startofheaders = self.fp.tell()
|
|
except IOError:
|
|
self.seekable = 0
|
|
#
|
|
self.readheaders()
|
|
#
|
|
if self.seekable:
|
|
try:
|
|
self.startofbody = self.fp.tell()
|
|
except IOError:
|
|
self.seekable = 0
|
|
|
|
def rewindbody(self):
|
|
"""Rewind the file to the start of the body (if seekable)."""
|
|
if not self.seekable:
|
|
raise IOError, "unseekable file"
|
|
self.fp.seek(self.startofbody)
|
|
|
|
def readheaders(self):
|
|
"""Read header lines.
|
|
|
|
Read header lines up to the entirely blank line that terminates them.
|
|
The (normally blank) line that ends the headers is skipped, but not
|
|
included in the returned list. If a non-header line ends the headers,
|
|
(which is an error), an attempt is made to backspace over it; it is
|
|
never included in the returned list.
|
|
|
|
The variable self.status is set to the empty string if all went well,
|
|
otherwise it is an error message. The variable self.headers is a
|
|
completely uninterpreted list of lines contained in the header (so
|
|
printing them will reproduce the header exactly as it appears in the
|
|
file).
|
|
"""
|
|
self.dict = {}
|
|
self.unixfrom = ''
|
|
self.headers = lst = []
|
|
self.status = ''
|
|
headerseen = ""
|
|
firstline = 1
|
|
startofline = unread = tell = None
|
|
if hasattr(self.fp, 'unread'):
|
|
unread = self.fp.unread
|
|
elif self.seekable:
|
|
tell = self.fp.tell
|
|
while 1:
|
|
if tell:
|
|
try:
|
|
startofline = tell()
|
|
except IOError:
|
|
startofline = tell = None
|
|
self.seekable = 0
|
|
line = self.fp.readline()
|
|
if not line:
|
|
self.status = 'EOF in headers'
|
|
break
|
|
# Skip unix From name time lines
|
|
if firstline and line.startswith('From '):
|
|
self.unixfrom = self.unixfrom + line
|
|
continue
|
|
firstline = 0
|
|
if headerseen and line[0] in ' \t':
|
|
# It's a continuation line.
|
|
lst.append(line)
|
|
x = (self.dict[headerseen] + "\n " + line.strip())
|
|
self.dict[headerseen] = x.strip()
|
|
continue
|
|
elif self.iscomment(line):
|
|
# It's a comment. Ignore it.
|
|
continue
|
|
elif self.islast(line):
|
|
# Note! No pushback here! The delimiter line gets eaten.
|
|
break
|
|
headerseen = self.isheader(line)
|
|
if headerseen:
|
|
# It's a legal header line, save it.
|
|
lst.append(line)
|
|
self.dict[headerseen] = line[len(headerseen)+1:].strip()
|
|
continue
|
|
else:
|
|
# It's not a header line; throw it back and stop here.
|
|
if not self.dict:
|
|
self.status = 'No headers'
|
|
else:
|
|
self.status = 'Non-header line where header expected'
|
|
# Try to undo the read.
|
|
if unread:
|
|
unread(line)
|
|
elif tell:
|
|
self.fp.seek(startofline)
|
|
else:
|
|
self.status = self.status + '; bad seek'
|
|
break
|
|
|
|
def isheader(self, line):
|
|
"""Determine whether a given line is a legal header.
|
|
|
|
This method should return the header name, suitably canonicalized.
|
|
You may override this method in order to use Message parsing on tagged
|
|
data in RFC 2822-like formats with special header formats.
|
|
"""
|
|
i = line.find(':')
|
|
if i > 0:
|
|
return line[:i].lower()
|
|
return None
|
|
|
|
def islast(self, line):
|
|
"""Determine whether a line is a legal end of RFC 2822 headers.
|
|
|
|
You may override this method if your application wants to bend the
|
|
rules, e.g. to strip trailing whitespace, or to recognize MH template
|
|
separators ('--------'). For convenience (e.g. for code reading from
|
|
sockets) a line consisting of \r\n also matches.
|
|
"""
|
|
return line in _blanklines
|
|
|
|
def iscomment(self, line):
|
|
"""Determine whether a line should be skipped entirely.
|
|
|
|
You may override this method in order to use Message parsing on tagged
|
|
data in RFC 2822-like formats that support embedded comments or
|
|
free-text data.
|
|
"""
|
|
return False
|
|
|
|
def getallmatchingheaders(self, name):
|
|
"""Find all header lines matching a given header name.
|
|
|
|
Look through the list of headers and find all lines matching a given
|
|
header name (and their continuation lines). A list of the lines is
|
|
returned, without interpretation. If the header does not occur, an
|
|
empty list is returned. If the header occurs multiple times, all
|
|
occurrences are returned. Case is not important in the header name.
|
|
"""
|
|
name = name.lower() + ':'
|
|
n = len(name)
|
|
lst = []
|
|
hit = 0
|
|
for line in self.headers:
|
|
if line[:n].lower() == name:
|
|
hit = 1
|
|
elif not line[:1].isspace():
|
|
hit = 0
|
|
if hit:
|
|
lst.append(line)
|
|
return lst
|
|
|
|
def getfirstmatchingheader(self, name):
|
|
"""Get the first header line matching name.
|
|
|
|
This is similar to getallmatchingheaders, but it returns only the
|
|
first matching header (and its continuation lines).
|
|
"""
|
|
name = name.lower() + ':'
|
|
n = len(name)
|
|
lst = []
|
|
hit = 0
|
|
for line in self.headers:
|
|
if hit:
|
|
if not line[:1].isspace():
|
|
break
|
|
elif line[:n].lower() == name:
|
|
hit = 1
|
|
if hit:
|
|
lst.append(line)
|
|
return lst
|
|
|
|
def getrawheader(self, name):
|
|
"""A higher-level interface to getfirstmatchingheader().
|
|
|
|
Return a string containing the literal text of the header but with the
|
|
keyword stripped. All leading, trailing and embedded whitespace is
|
|
kept in the string, however. Return None if the header does not
|
|
occur.
|
|
"""
|
|
|
|
lst = self.getfirstmatchingheader(name)
|
|
if not lst:
|
|
return None
|
|
lst[0] = lst[0][len(name) + 1:]
|
|
return ''.join(lst)
|
|
|
|
def getheader(self, name, default=None):
|
|
"""Get the header value for a name.
|
|
|
|
This is the normal interface: it returns a stripped version of the
|
|
header value for a given header name, or None if it doesn't exist.
|
|
This uses the dictionary version which finds the *last* such header.
|
|
"""
|
|
return self.dict.get(name.lower(), default)
|
|
get = getheader
|
|
|
|
def getheaders(self, name):
|
|
"""Get all values for a header.
|
|
|
|
This returns a list of values for headers given more than once; each
|
|
value in the result list is stripped in the same way as the result of
|
|
getheader(). If the header is not given, return an empty list.
|
|
"""
|
|
result = []
|
|
current = ''
|
|
have_header = 0
|
|
for s in self.getallmatchingheaders(name):
|
|
if s[0].isspace():
|
|
if current:
|
|
current = "%s\n %s" % (current, s.strip())
|
|
else:
|
|
current = s.strip()
|
|
else:
|
|
if have_header:
|
|
result.append(current)
|
|
current = s[s.find(":") + 1:].strip()
|
|
have_header = 1
|
|
if have_header:
|
|
result.append(current)
|
|
return result
|
|
|
|
def getaddr(self, name):
|
|
"""Get a single address from a header, as a tuple.
|
|
|
|
An example return value:
|
|
('Guido van Rossum', 'guido@cwi.nl')
|
|
"""
|
|
# New, by Ben Escoto
|
|
alist = self.getaddrlist(name)
|
|
if alist:
|
|
return alist[0]
|
|
else:
|
|
return (None, None)
|
|
|
|
def getaddrlist(self, name):
|
|
"""Get a list of addresses from a header.
|
|
|
|
Retrieves a list of addresses from a header, where each address is a
|
|
tuple as returned by getaddr(). Scans all named headers, so it works
|
|
properly with multiple To: or Cc: headers for example.
|
|
"""
|
|
raw = []
|
|
for h in self.getallmatchingheaders(name):
|
|
if h[0] in ' \t':
|
|
raw.append(h)
|
|
else:
|
|
if raw:
|
|
raw.append(', ')
|
|
i = h.find(':')
|
|
if i > 0:
|
|
addr = h[i+1:]
|
|
raw.append(addr)
|
|
alladdrs = ''.join(raw)
|
|
a = AddressList(alladdrs)
|
|
return a.addresslist
|
|
|
|
def getdate(self, name):
|
|
"""Retrieve a date field from a header.
|
|
|
|
Retrieves a date field from the named header, returning a tuple
|
|
compatible with time.mktime().
|
|
"""
|
|
try:
|
|
data = self[name]
|
|
except KeyError:
|
|
return None
|
|
return parsedate(data)
|
|
|
|
def getdate_tz(self, name):
|
|
"""Retrieve a date field from a header as a 10-tuple.
|
|
|
|
The first 9 elements make up a tuple compatible with time.mktime(),
|
|
and the 10th is the offset of the poster's time zone from GMT/UTC.
|
|
"""
|
|
try:
|
|
data = self[name]
|
|
except KeyError:
|
|
return None
|
|
return parsedate_tz(data)
|
|
|
|
|
|
# Access as a dictionary (only finds *last* header of each type):
|
|
|
|
def __len__(self):
|
|
"""Get the number of headers in a message."""
|
|
return len(self.dict)
|
|
|
|
def __getitem__(self, name):
|
|
"""Get a specific header, as from a dictionary."""
|
|
return self.dict[name.lower()]
|
|
|
|
def __setitem__(self, name, value):
|
|
"""Set the value of a header.
|
|
|
|
Note: This is not a perfect inversion of __getitem__, because any
|
|
changed headers get stuck at the end of the raw-headers list rather
|
|
than where the altered header was.
|
|
"""
|
|
del self[name] # Won't fail if it doesn't exist
|
|
self.dict[name.lower()] = value
|
|
text = name + ": " + value
|
|
for line in text.split("\n"):
|
|
self.headers.append(line + "\n")
|
|
|
|
def __delitem__(self, name):
|
|
"""Delete all occurrences of a specific header, if it is present."""
|
|
name = name.lower()
|
|
if not name in self.dict:
|
|
return
|
|
del self.dict[name]
|
|
name = name + ':'
|
|
n = len(name)
|
|
lst = []
|
|
hit = 0
|
|
for i in range(len(self.headers)):
|
|
line = self.headers[i]
|
|
if line[:n].lower() == name:
|
|
hit = 1
|
|
elif not line[:1].isspace():
|
|
hit = 0
|
|
if hit:
|
|
lst.append(i)
|
|
for i in reversed(lst):
|
|
del self.headers[i]
|
|
|
|
def setdefault(self, name, default=""):
|
|
lowername = name.lower()
|
|
if lowername in self.dict:
|
|
return self.dict[lowername]
|
|
else:
|
|
text = name + ": " + default
|
|
for line in text.split("\n"):
|
|
self.headers.append(line + "\n")
|
|
self.dict[lowername] = default
|
|
return default
|
|
|
|
def has_key(self, name):
|
|
"""Determine whether a message contains the named header."""
|
|
return name.lower() in self.dict
|
|
|
|
def __contains__(self, name):
|
|
"""Determine whether a message contains the named header."""
|
|
return name.lower() in self.dict
|
|
|
|
def __iter__(self):
|
|
return iter(self.dict)
|
|
|
|
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()
|