mirror of https://github.com/python/cpython
536 lines
14 KiB
Python
536 lines
14 KiB
Python
"""An NNTP client class based on RFC 977: Network News Transfer Protocol.
|
||
|
||
Example:
|
||
|
||
>>> from nntplib import NNTP
|
||
>>> s = NNTP('news')
|
||
>>> resp, count, first, last, name = s.group('comp.lang.python')
|
||
>>> print 'Group', name, 'has', count, 'articles, range', first, 'to', last
|
||
Group comp.lang.python has 51 articles, range 5770 to 5821
|
||
>>> resp, subs = s.xhdr('subject', first + '-' + last)
|
||
>>> resp = s.quit()
|
||
>>>
|
||
|
||
Here 'resp' is the server response line.
|
||
Error responses are turned into exceptions.
|
||
|
||
To post an article from a file:
|
||
>>> f = open(filename, 'r') # file containing article, including header
|
||
>>> resp = s.post(f)
|
||
>>>
|
||
|
||
For descriptions of all methods, read the comments in the code below.
|
||
Note that all arguments and return values representing article numbers
|
||
are strings, not numbers, since they are rarely used for calculations.
|
||
"""
|
||
|
||
# RFC 977 by Brian Kantor and Phil Lapsley.
|
||
# xover, xgtitle, xpath, date methods by Kevan Heydon
|
||
|
||
|
||
# Imports
|
||
import re
|
||
import socket
|
||
import string
|
||
|
||
|
||
|
||
# Exceptions raised when an error or invalid response is received
|
||
class NNTPError(Exception):
|
||
"""Base class for all nntplib exceptions"""
|
||
def __init__(self, *args):
|
||
apply(Exception.__init__, (self,)+args)
|
||
try:
|
||
self.response = args[0]
|
||
except IndexError:
|
||
self.response = 'No response given'
|
||
|
||
class NNTPReplyError(NNTPError):
|
||
"""Unexpected [123]xx reply"""
|
||
pass
|
||
|
||
class NNTPTemporaryError(NNTPError):
|
||
"""4xx errors"""
|
||
pass
|
||
|
||
class NNTPPermanentError(NNTPError):
|
||
"""5xx errors"""
|
||
pass
|
||
|
||
class NNTPProtocolError(NNTPError):
|
||
"""Response does not begin with [1-5]"""
|
||
pass
|
||
|
||
class NNTPDataError(NNTPError):
|
||
"""Error in response data"""
|
||
pass
|
||
|
||
# for backwards compatibility
|
||
error_reply = NNTPReplyError
|
||
error_temp = NNTPTemporaryError
|
||
error_perm = NNTPPermanentError
|
||
error_proto = NNTPProtocolError
|
||
error_data = NNTPDataError
|
||
|
||
|
||
|
||
# Standard port used by NNTP servers
|
||
NNTP_PORT = 119
|
||
|
||
|
||
# Response numbers that are followed by additional text (e.g. article)
|
||
LONGRESP = ['100', '215', '220', '221', '222', '224', '230', '231', '282']
|
||
|
||
|
||
# Line terminators (we always output CRLF, but accept any of CRLF, CR, LF)
|
||
CRLF = '\r\n'
|
||
|
||
|
||
|
||
# The class itself
|
||
class NNTP:
|
||
def __init__(self, host, port=NNTP_PORT, user=None, password=None,
|
||
readermode=None):
|
||
"""Initialize an instance. Arguments:
|
||
- host: hostname to connect to
|
||
- port: port to connect to (default the standard NNTP port)
|
||
- user: username to authenticate with
|
||
- password: password to use with username
|
||
- readermode: if true, send 'mode reader' command after
|
||
connecting.
|
||
|
||
readermode is sometimes necessary if you are connecting to an
|
||
NNTP server on the local machine and intend to call
|
||
reader-specific comamnds, such as `group'. If you get
|
||
unexpected NNTPPermanentErrors, you might need to set
|
||
readermode.
|
||
"""
|
||
self.host = host
|
||
self.port = port
|
||
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
||
self.sock.connect((self.host, self.port))
|
||
self.file = self.sock.makefile('rb')
|
||
self.debugging = 0
|
||
self.welcome = self.getresp()
|
||
if readermode:
|
||
try:
|
||
self.welcome = self.shortcmd('mode reader')
|
||
except NNTPPermanentError:
|
||
# error 500, probably 'not implemented'
|
||
pass
|
||
if user:
|
||
resp = self.shortcmd('authinfo user '+user)
|
||
if resp[:3] == '381':
|
||
if not password:
|
||
raise NNTPReplyError(resp)
|
||
else:
|
||
resp = self.shortcmd(
|
||
'authinfo pass '+password)
|
||
if resp[:3] != '281':
|
||
raise NNTPPermanentError(resp)
|
||
|
||
# Get the welcome message from the server
|
||
# (this is read and squirreled away by __init__()).
|
||
# If the response code is 200, posting is allowed;
|
||
# if it 201, posting is not allowed
|
||
|
||
def getwelcome(self):
|
||
"""Get the welcome message from the server
|
||
(this is read and squirreled away by __init__()).
|
||
If the response code is 200, posting is allowed;
|
||
if it 201, posting is not allowed."""
|
||
|
||
if self.debugging: print '*welcome*', `self.welcome`
|
||
return self.welcome
|
||
|
||
def set_debuglevel(self, level):
|
||
"""Set the debugging level. Argument 'level' means:
|
||
0: no debugging output (default)
|
||
1: print commands and responses but not body text etc.
|
||
2: also print raw lines read and sent before stripping CR/LF"""
|
||
|
||
self.debugging = level
|
||
debug = set_debuglevel
|
||
|
||
def putline(self, line):
|
||
"""Internal: send one line to the server, appending CRLF."""
|
||
line = line + CRLF
|
||
if self.debugging > 1: print '*put*', `line`
|
||
self.sock.send(line)
|
||
|
||
def putcmd(self, line):
|
||
"""Internal: send one command to the server (through putline())."""
|
||
if self.debugging: print '*cmd*', `line`
|
||
self.putline(line)
|
||
|
||
def getline(self):
|
||
"""Internal: return one line from the server, stripping CRLF.
|
||
Raise EOFError if the connection is closed."""
|
||
line = self.file.readline()
|
||
if self.debugging > 1:
|
||
print '*get*', `line`
|
||
if not line: raise EOFError
|
||
if line[-2:] == CRLF: line = line[:-2]
|
||
elif line[-1:] in CRLF: line = line[:-1]
|
||
return line
|
||
|
||
def getresp(self):
|
||
"""Internal: get a response from the server.
|
||
Raise various errors if the response indicates an error."""
|
||
resp = self.getline()
|
||
if self.debugging: print '*resp*', `resp`
|
||
c = resp[:1]
|
||
if c == '4':
|
||
raise NNTPTemporaryError(resp)
|
||
if c == '5':
|
||
raise NNTPPermanentError(resp)
|
||
if c not in '123':
|
||
raise NNTPProtocolError(resp)
|
||
return resp
|
||
|
||
def getlongresp(self):
|
||
"""Internal: get a response plus following text from the server.
|
||
Raise various errors if the response indicates an error."""
|
||
resp = self.getresp()
|
||
if resp[:3] not in LONGRESP:
|
||
raise NNTPReplyError(resp)
|
||
list = []
|
||
while 1:
|
||
line = self.getline()
|
||
if line == '.':
|
||
break
|
||
if line[:2] == '..':
|
||
line = line[1:]
|
||
list.append(line)
|
||
return resp, list
|
||
|
||
def shortcmd(self, line):
|
||
"""Internal: send a command and get the response."""
|
||
self.putcmd(line)
|
||
return self.getresp()
|
||
|
||
def longcmd(self, line):
|
||
"""Internal: send a command and get the response plus following text."""
|
||
self.putcmd(line)
|
||
return self.getlongresp()
|
||
|
||
def newgroups(self, date, time):
|
||
"""Process a NEWGROUPS command. Arguments:
|
||
- date: string 'yymmdd' indicating the date
|
||
- time: string 'hhmmss' indicating the time
|
||
Return:
|
||
- resp: server response if successful
|
||
- list: list of newsgroup names"""
|
||
|
||
return self.longcmd('NEWGROUPS ' + date + ' ' + time)
|
||
|
||
def newnews(self, group, date, time):
|
||
"""Process a NEWNEWS command. Arguments:
|
||
- group: group name or '*'
|
||
- date: string 'yymmdd' indicating the date
|
||
- time: string 'hhmmss' indicating the time
|
||
Return:
|
||
- resp: server response if successful
|
||
- list: list of article ids"""
|
||
|
||
cmd = 'NEWNEWS ' + group + ' ' + date + ' ' + time
|
||
return self.longcmd(cmd)
|
||
|
||
def list(self):
|
||
"""Process a LIST command. Return:
|
||
- resp: server response if successful
|
||
- list: list of (group, last, first, flag) (strings)"""
|
||
|
||
resp, list = self.longcmd('LIST')
|
||
for i in range(len(list)):
|
||
# Parse lines into "group last first flag"
|
||
list[i] = tuple(string.split(list[i]))
|
||
return resp, list
|
||
|
||
def group(self, name):
|
||
"""Process a GROUP command. Argument:
|
||
- group: the group name
|
||
Returns:
|
||
- resp: server response if successful
|
||
- count: number of articles (string)
|
||
- first: first article number (string)
|
||
- last: last article number (string)
|
||
- name: the group name"""
|
||
|
||
resp = self.shortcmd('GROUP ' + name)
|
||
if resp[:3] <> '211':
|
||
raise NNTPReplyError(resp)
|
||
words = string.split(resp)
|
||
count = first = last = 0
|
||
n = len(words)
|
||
if n > 1:
|
||
count = words[1]
|
||
if n > 2:
|
||
first = words[2]
|
||
if n > 3:
|
||
last = words[3]
|
||
if n > 4:
|
||
name = string.lower(words[4])
|
||
return resp, count, first, last, name
|
||
|
||
def help(self):
|
||
"""Process a HELP command. Returns:
|
||
- resp: server response if successful
|
||
- list: list of strings"""
|
||
|
||
return self.longcmd('HELP')
|
||
|
||
def statparse(self, resp):
|
||
"""Internal: parse the response of a STAT, NEXT or LAST command."""
|
||
if resp[:2] <> '22':
|
||
raise NNTPReplyError(resp)
|
||
words = string.split(resp)
|
||
nr = 0
|
||
id = ''
|
||
n = len(words)
|
||
if n > 1:
|
||
nr = words[1]
|
||
if n > 2:
|
||
id = words[2]
|
||
return resp, nr, id
|
||
|
||
def statcmd(self, line):
|
||
"""Internal: process a STAT, NEXT or LAST command."""
|
||
resp = self.shortcmd(line)
|
||
return self.statparse(resp)
|
||
|
||
def stat(self, id):
|
||
"""Process a STAT command. Argument:
|
||
- id: article number or message id
|
||
Returns:
|
||
- resp: server response if successful
|
||
- nr: the article number
|
||
- id: the article id"""
|
||
|
||
return self.statcmd('STAT ' + id)
|
||
|
||
def next(self):
|
||
"""Process a NEXT command. No arguments. Return as for STAT."""
|
||
return self.statcmd('NEXT')
|
||
|
||
def last(self):
|
||
"""Process a LAST command. No arguments. Return as for STAT."""
|
||
return self.statcmd('LAST')
|
||
|
||
def artcmd(self, line):
|
||
"""Internal: process a HEAD, BODY or ARTICLE command."""
|
||
resp, list = self.longcmd(line)
|
||
resp, nr, id = self.statparse(resp)
|
||
return resp, nr, id, list
|
||
|
||
def head(self, id):
|
||
"""Process a HEAD command. Argument:
|
||
- id: article number or message id
|
||
Returns:
|
||
- resp: server response if successful
|
||
- nr: article number
|
||
- id: message id
|
||
- list: the lines of the article's header"""
|
||
|
||
return self.artcmd('HEAD ' + id)
|
||
|
||
def body(self, id):
|
||
"""Process a BODY command. Argument:
|
||
- id: article number or message id
|
||
Returns:
|
||
- resp: server response if successful
|
||
- nr: article number
|
||
- id: message id
|
||
- list: the lines of the article's body"""
|
||
|
||
return self.artcmd('BODY ' + id)
|
||
|
||
def article(self, id):
|
||
"""Process an ARTICLE command. Argument:
|
||
- id: article number or message id
|
||
Returns:
|
||
- resp: server response if successful
|
||
- nr: article number
|
||
- id: message id
|
||
- list: the lines of the article"""
|
||
|
||
return self.artcmd('ARTICLE ' + id)
|
||
|
||
def slave(self):
|
||
"""Process a SLAVE command. Returns:
|
||
- resp: server response if successful"""
|
||
|
||
return self.shortcmd('SLAVE')
|
||
|
||
def xhdr(self, hdr, str):
|
||
"""Process an XHDR command (optional server extension). Arguments:
|
||
- hdr: the header type (e.g. 'subject')
|
||
- str: an article nr, a message id, or a range nr1-nr2
|
||
Returns:
|
||
- resp: server response if successful
|
||
- list: list of (nr, value) strings"""
|
||
|
||
pat = re.compile('^([0-9]+) ?(.*)\n?')
|
||
resp, lines = self.longcmd('XHDR ' + hdr + ' ' + str)
|
||
for i in range(len(lines)):
|
||
line = lines[i]
|
||
m = pat.match(line)
|
||
if m:
|
||
lines[i] = m.group(1, 2)
|
||
return resp, lines
|
||
|
||
def xover(self,start,end):
|
||
"""Process an XOVER command (optional server extension) Arguments:
|
||
- start: start of range
|
||
- end: end of range
|
||
Returns:
|
||
- resp: server response if successful
|
||
- list: list of (art-nr, subject, poster, date,
|
||
id, references, size, lines)"""
|
||
|
||
resp, lines = self.longcmd('XOVER ' + start + '-' + end)
|
||
xover_lines = []
|
||
for line in lines:
|
||
elem = string.splitfields(line,"\t")
|
||
try:
|
||
xover_lines.append((elem[0],
|
||
elem[1],
|
||
elem[2],
|
||
elem[3],
|
||
elem[4],
|
||
string.split(elem[5]),
|
||
elem[6],
|
||
elem[7]))
|
||
except IndexError:
|
||
raise NNTPDataError(line)
|
||
return resp,xover_lines
|
||
|
||
def xgtitle(self, group):
|
||
"""Process an XGTITLE command (optional server extension) Arguments:
|
||
- group: group name wildcard (i.e. news.*)
|
||
Returns:
|
||
- resp: server response if successful
|
||
- list: list of (name,title) strings"""
|
||
|
||
line_pat = re.compile("^([^ \t]+)[ \t]+(.*)$")
|
||
resp, raw_lines = self.longcmd('XGTITLE ' + group)
|
||
lines = []
|
||
for raw_line in raw_lines:
|
||
match = line_pat.search(string.strip(raw_line))
|
||
if match:
|
||
lines.append(match.group(1, 2))
|
||
return resp, lines
|
||
|
||
def xpath(self,id):
|
||
"""Process an XPATH command (optional server extension) Arguments:
|
||
- id: Message id of article
|
||
Returns:
|
||
resp: server response if successful
|
||
path: directory path to article"""
|
||
|
||
resp = self.shortcmd("XPATH " + id)
|
||
if resp[:3] <> '223':
|
||
raise NNTPReplyError(resp)
|
||
try:
|
||
[resp_num, path] = string.split(resp)
|
||
except ValueError:
|
||
raise NNTPReplyError(resp)
|
||
else:
|
||
return resp, path
|
||
|
||
def date (self):
|
||
"""Process the DATE command. Arguments:
|
||
None
|
||
Returns:
|
||
resp: server response if successful
|
||
date: Date suitable for newnews/newgroups commands etc.
|
||
time: Time suitable for newnews/newgroups commands etc."""
|
||
|
||
resp = self.shortcmd("DATE")
|
||
if resp[:3] <> '111':
|
||
raise NNTPReplyError(resp)
|
||
elem = string.split(resp)
|
||
if len(elem) != 2:
|
||
raise NNTPDataError(resp)
|
||
date = elem[1][2:8]
|
||
time = elem[1][-6:]
|
||
if len(date) != 6 or len(time) != 6:
|
||
raise NNTPDataError(resp)
|
||
return resp, date, time
|
||
|
||
|
||
def post(self, f):
|
||
"""Process a POST command. Arguments:
|
||
- f: file containing the article
|
||
Returns:
|
||
- resp: server response if successful"""
|
||
|
||
resp = self.shortcmd('POST')
|
||
# Raises error_??? if posting is not allowed
|
||
if resp[0] <> '3':
|
||
raise NNTPReplyError(resp)
|
||
while 1:
|
||
line = f.readline()
|
||
if not line:
|
||
break
|
||
if line[-1] == '\n':
|
||
line = line[:-1]
|
||
if line[:1] == '.':
|
||
line = '.' + line
|
||
self.putline(line)
|
||
self.putline('.')
|
||
return self.getresp()
|
||
|
||
def ihave(self, id, f):
|
||
"""Process an IHAVE command. Arguments:
|
||
- id: message-id of the article
|
||
- f: file containing the article
|
||
Returns:
|
||
- resp: server response if successful
|
||
Note that if the server refuses the article an exception is raised."""
|
||
|
||
resp = self.shortcmd('IHAVE ' + id)
|
||
# Raises error_??? if the server already has it
|
||
if resp[0] <> '3':
|
||
raise NNTPReplyError(resp)
|
||
while 1:
|
||
line = f.readline()
|
||
if not line:
|
||
break
|
||
if line[-1] == '\n':
|
||
line = line[:-1]
|
||
if line[:1] == '.':
|
||
line = '.' + line
|
||
self.putline(line)
|
||
self.putline('.')
|
||
return self.getresp()
|
||
|
||
def quit(self):
|
||
"""Process a QUIT command and close the socket. Returns:
|
||
- resp: server response if successful"""
|
||
|
||
resp = self.shortcmd('QUIT')
|
||
self.file.close()
|
||
self.sock.close()
|
||
del self.file, self.sock
|
||
return resp
|
||
|
||
|
||
def _test():
|
||
"""Minimal test function."""
|
||
s = NNTP('news', readermode='reader')
|
||
resp, count, first, last, name = s.group('comp.lang.python')
|
||
print resp
|
||
print 'Group', name, 'has', count, 'articles, range', first, 'to', last
|
||
resp, subs = s.xhdr('subject', first + '-' + last)
|
||
print resp
|
||
for item in subs:
|
||
print "%7s %s" % item
|
||
resp = s.quit()
|
||
print resp
|
||
|
||
|
||
# Run the test when run as a script
|
||
if __name__ == '__main__':
|
||
_test()
|