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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 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.
i����N( t warnpy3ks= in 3.x, rfc822 has been removed in favor of the email packaget
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r9 d } q= Xn | | _ | | _ d | _ d | _ | j r� y | j j � | _ Wq� t k
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r� d | _ q� Xn d S( s3 Initialize the class instance and read the headers.i i N( t tellt AttributeErrort IOErrort fpt seekablet Nonet startofheaderst startofbodyt readheaders( t selfR
R ( ( s" /usr/local/lib/python2.7/rfc822.pyt __init__X s(
c C s, | j s t d � n | j j | j � d S( s7 Rewind the file to the start of the body (if seekable).s unseekable fileN( R R R
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s� 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).
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; bad seekN( t dictt unixfromt headerst statusR t hasattrR
R R R R t readlinet
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c C s- | j d � } | d k r) | | j � Sd S( s 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.
t :i����N( t findt lowerR ( R R' t i( ( s" /usr/local/lib/python2.7/rfc822.pyR! � s c C s
| t k S( sf 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.
( t _blanklines( R R' ( ( s" /usr/local/lib/python2.7/rfc822.pyR � s c C s t S( s� 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.
( t False( R R' ( ( s" /usr/local/lib/python2.7/rfc822.pyR � s c C s� | j � d } t | � } g } d } x_ | j D]T } | | j � | k rW d } n | d j � sp d } n | r2 | j | � q2 q2 W| S( s� 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.
R) i i ( R+ R" R t isspaceR ( R t namet nR# t hitR' ( ( s" /usr/local/lib/python2.7/rfc822.pyt getallmatchingheaders� s c C s� | j � d } t | � } g } d } xc | j D]X } | rU | d j � st Pqt n | | j � | k rt d } n | r2 | j | � q2 q2 W| S( s� Get the first header line matching name.
This is similar to getallmatchingheaders, but it returns only the
first matching header (and its continuation lines).
R) i i ( R+ R" R R/ R ( R R0 R1 R# R2 R' ( ( s" /usr/local/lib/python2.7/rfc822.pyt getfirstmatchingheader� s c C sB | j | � } | s d S| d t | � d | d <d j | � S( s2 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.
i i R N( R4 R R" t join( R R0 R# ( ( s" /usr/local/lib/python2.7/rfc822.pyt getrawheader s
c C s | j j | j � | � S( s
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.
( R t getR+ ( R R0 t default( ( s" /usr/local/lib/python2.7/rfc822.pyt getheader" s c C s� g } d } d } x� | j | � D]} } | d j � rf | rW d | | j � f } q� | j � } q" | r| | j | � n | | j d � d j � } d } q" W| r� | j | � n | S( s 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.
R i s %s
%sR) i ( R3 R/ R R R* ( R R0 t resultt currentt have_headert s( ( s" /usr/local/lib/python2.7/rfc822.pyt
getheaders, s
c C s% | j | � } | r | d Sd Sd S( s� Get a single address from a header, as a tuple.
An example return value:
('Guido van Rossum', 'guido@cwi.nl')
i N( NN( t getaddrlistR ( R R0 t alist( ( s" /usr/local/lib/python2.7/rfc822.pyt getaddrE s c C s� g } x� | j | � D]u } | d d k r< | j | � q | rR | j d � n | j d � } | d k r~ | | d } n | j | � q Wd j | � } t | � } | j S( s
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.
i s s , R) i R ( R3 R R* R5 R t addresslist( R R0 t rawt hR, t addrt alladdrst a( ( s" /usr/local/lib/python2.7/rfc822.pyR? R s c C s- y | | } Wn t k
r" d SXt | � S( s� Retrieve a date field from a header.
Retrieves a date field from the named header, returning a tuple
compatible with time.mktime().
N( t KeyErrorR R ( R R0 t data( ( s" /usr/local/lib/python2.7/rfc822.pyt getdateh s
c C s- y | | } Wn t k
r" d SXt | � S( s� 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.
N( RH R R ( R R0 RI ( ( s" /usr/local/lib/python2.7/rfc822.pyt
getdate_tzt s
c C s
t | j � S( s' Get the number of headers in a message.( R" R ( R ( ( s" /usr/local/lib/python2.7/rfc822.pyt __len__� s c C s | j | j � S( s, Get a specific header, as from a dictionary.( R R+ ( R R0 ( ( s" /usr/local/lib/python2.7/rfc822.pyt __getitem__� s c C sZ | | =| | j | j � <| d | } x+ | j d � D] } | j j | d � q8 Wd S( s� 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.
s : s
N( R R+ t splitR R ( R R0 t valuet textR' ( ( s" /usr/local/lib/python2.7/rfc822.pyt __setitem__� s
c C s� | j � } | | j k r d S| j | =| d } t | � } g } d } xx t t | j � � D]a } | j | } | | j � | k r� d } n | d j � s� d } n | ra | j | � qa qa Wx t | � D] } | j | =q� Wd S( s> Delete all occurrences of a specific header, if it is present.NR) i i ( R+ R R" t rangeR R/ R t reversed( R R0 R1 R# R2 R, R' ( ( s" /usr/local/lib/python2.7/rfc822.pyt __delitem__� s$
R c C sw | j � } | | j k r& | j | S| d | } x+ | j d � D] } | j j | d � qD W| | j | <| Sd S( Ns : s
( R+ R RN R R ( R R0 R8 t lowernameRP R' ( ( s" /usr/local/lib/python2.7/rfc822.pyt
setdefault� s
c C s | j � | j k S( s6 Determine whether a message contains the named header.( R+ R ( R R0 ( ( s" /usr/local/lib/python2.7/rfc822.pyt has_key� s c C s | j � | j k S( s6 Determine whether a message contains the named header.( R+ R ( R R0 ( ( s" /usr/local/lib/python2.7/rfc822.pyt __contains__� s c C s
t | j � S( N( t iterR ( R ( ( s" /usr/local/lib/python2.7/rfc822.pyt __iter__� s c C s
| j j � S( s* Get all of a message's header field names.( R t keys( R ( ( s" /usr/local/lib/python2.7/rfc822.pyR[ � s c C s
| j j � S( s+ Get all of a message's header field values.( R t values( R ( ( s" /usr/local/lib/python2.7/rfc822.pyR\ � s c C s
| j j � S( sW Get all of a message's headers.
Returns a list of name, value tuples.
( R t items( R ( ( s" /usr/local/lib/python2.7/rfc822.pyR] � s c C s d j | j � S( NR ( R5 R ( R ( ( s" /usr/local/lib/python2.7/rfc822.pyt __str__� s N( t __name__t
__module__t __doc__R R R R! R R R3 R4 R6 R R9 R7 R> RA R? RJ RK RL RM RQ RT RV RW RX RZ R[ R\ R] R^ ( ( ( s" /usr/local/lib/python2.7/rfc822.pyR U s: P
c C s� t | � d k r | j d � rS | j d � rS | d d !j d d � j d d � S| j d � r | j d � r | d d !Sn | S( s Remove quotes from a string.i t "i����s \\s \s \"t <t >( R" R t endswitht replace( R= ( ( s" /usr/local/lib/python2.7/rfc822.pyt unquote� s # c C s | j d d � j d d � S( s Add quotes around a string.s \s \\Rb s \"( Rf ( R= ( ( s" /usr/local/lib/python2.7/rfc822.pyt quote� s c C s' t | � } | j } | s d S| d S( s3 Parse an address into a (realname, mailaddr) tuple.i N( NN( R RB R ( t addressRG R# ( ( s" /usr/local/lib/python2.7/rfc822.pyt parseaddr� s
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AddrlistClassc B s� e Z d Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d d � Z
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� Z d � Z RS( s) 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.
c C sl d | _ d | _ d | _ d | _ | j | j | j | _ | j j d d � | _ | | _ g | _ d S( s� Initialize a new instance.
`field' is an unparsed address header field, containing one or more
addresses.
s ()<>@,:;."[]i s s
t .R N( t specialst post LWSt CRt atomendsRf t
phraseendst fieldt commentlist( R Rs ( ( s" /usr/local/lib/python2.7/rfc822.pyR s c C s� x| | j t | j � k r~ | j | j | j d k rK | j d | _ q | j | j d k rz | j j | j � � q Pq Wd S( s* Parse up to the start of the next address.s
i t (N( Rn R" Rs Ro Rt R t
getcomment( R ( ( s" /usr/local/lib/python2.7/rfc822.pyt gotonext s c C s9 g } | j � } x | r4 | | 7} | j � } q W| S( sV Parse all addresses.
Returns a list containing all of the addresses.
( t
getaddress( R R: t ad( ( s" /usr/local/lib/python2.7/rfc822.pyR? s
c C s� g | _ | j � | j } | j } | j � } | j � g } | j t | j � k r� | rPd j | j � | d f g } qPn�| j | j d k r� | | _ | | _ | j � } d j | j � | f g } nz| j | j d k r�g } t | j � } | j d 7_ x=| j t | j � k r�| j � | j | k rm| j | j d k rm| j d 7_ Pn | | j � } qWn� | j | j d k r�| j � } | j r�d j | � d d j | j � d | f g } qPd j | � | f g } nS | r%d j | j � | d f g } n+ | j | j | j
k rP| j d 7_ n | j � | j t | j � k r�| j | j d
k r�| j d 7_ n | S( s Parse the next address.t i s .@R) i t ;Rc s (t )t ,( Rt Rw Rn t
getphraselistR" Rs R5 t getaddrspecRx t getrouteaddrRm ( R t oldpost oldclt plistt
returnlistt addrspect fieldlent routeaddr( ( s" /usr/local/lib/python2.7/rfc822.pyRx ( sL
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% 3"
.c C s | j | j d k r d Sd } | j d 7_ | j � d } x� | j t | j � k r| rs | j � d } n� | j | j d k r� | j d 7_ Pnr | j | j d k r� | j d 7_ d } nD | j | j d k r� | j d 7_ n | j � } | j d 7_ P| j � qB W| S( s� Parse a route address (Return-path value).
This method just skips all the route stuff and returns the addrspec.
Rc Ni i R Rd t @R) ( Rs Rn Rw R" t getdomainR ( R t expectroutet adlist( ( s" /usr/local/lib/python2.7/rfc822.pyR� b s.
c C sF g } | j � x� | j t | j � k r� | j | j d k r` | j d � | j d 7_ n` | j | j d k r� | j d | j � � n0 | j | j | j k r� Pn | j | j � � | j � q W| j t | j � k s� | j | j d k r d j | � S| j d � | j d 7_ | j � d j | � | j � S( s Parse an RFC 2822 addr-spec.Rl i Rb s "%s"R� R (
Rw Rn R" Rs R t getquoteRq t getatomR5 R� ( R t aslist( ( s" /usr/local/lib/python2.7/rfc822.pyR � s$
.
c C s g } x| j t | j � k r| j | j | j k rL | j d 7_ q | j | j d k r{ | j j | j � � q | j | j d k r� | j | j � � q | j | j d k r� | j d 7_ | j d � q | j | j | j k r� Pq | j | j � � q Wd j
| � S( s- Get the complete domain name from an address.i Ru t [Rl R ( Rn R" Rs Ro Rt R Rv t getdomainliteralRq R� R5 ( R t sdlist( ( s" /usr/local/lib/python2.7/rfc822.pyR� � s i c C s3 | j | j | k r d Sd g } d } | j d 7_ x� | j t | j � k r%| d k r | j | j | j � d } n� | j | j | k r� | j d 7_ Pnk | r� | j | j d k r� | j | j � � q; n6 | j | j d k r� d } n | j | j | j � | j d 7_ q; Wd j | � S( s� 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.
R i i Ru s \( Rs Rn R" R Rv R5 ( R t beginchart endcharst
allowcommentst slistRh ( ( s" /usr/local/lib/python2.7/rfc822.pyt getdelimited� s(
c C s | j d d d � S( s1 Get a quote-delimited fragment from self's field.Rb s "
i ( R� ( R ( ( s" /usr/local/lib/python2.7/rfc822.pyR� � s c C s | j d d d � S( s7 Get a parenthesis-delimited fragment from self's field.Ru s )
i ( R� ( R ( ( s" /usr/local/lib/python2.7/rfc822.pyRv � s c C s d | j d d d � S( s! Parse an RFC 2822 domain-literal.s [%s]R� s ]
i ( R� ( R ( ( s" /usr/local/lib/python2.7/rfc822.pyR� � s c C s� d g } | d k r! | j } n x\ | j t | j � k r | j | j | k rV Pn | j | j | j � | j d 7_ q$ Wd j | � S( s 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).R i N( R Rq Rn R" Rs R R5 ( R Rq t atomlist( ( s" /usr/local/lib/python2.7/rfc822.pyR� � s c C s� g } x� | j t | j � k r� | j | j | j k rL | j d 7_ q | j | j d k rx | j | j � � q | j | j d k r� | j j | j � � q | j | j | j k r� Pq | j | j | j � � q W| S( s� 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.
i Rb Ru (
Rn R" Rs Ro R R� Rt Rv Rr R� ( R R� ( ( s" /usr/local/lib/python2.7/rfc822.pyR~ � s N( R_ R` Ra R Rw R? Rx R� R R� R� R� Rv R� R R� R~ ( ( ( s" /usr/local/lib/python2.7/rfc822.pyRk � s
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RS( s@ An AddressList encapsulates a list of parsed RFC 2822 addresses.c C s5 t j | | � | r( | j � | _ n g | _ d S( N( Rk R R? RB ( R Rs ( ( s" /usr/local/lib/python2.7/rfc822.pyR s c C s
t | j � S( N( R" RB ( R ( ( s" /usr/local/lib/python2.7/rfc822.pyRL s c C s d j t t | j � � S( Ns , ( R5 t mapt dump_address_pairRB ( R ( ( s" /usr/local/lib/python2.7/rfc822.pyR^ s c C sS t d � } | j | _ x3 | j D]( } | | j k r# | j j | � q# q# W| S( N( R R RB R ( R t othert newaddrR( ( ( s" /usr/local/lib/python2.7/rfc822.pyt __add__ s
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