cpython-withatomic / Lib / nntplib.py

The branch 'legacy-trunk' does not exist.
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
# An NNTP client class.  Based on RFC 977: Network News Transfer
# Protocol, by Brian Kantor and Phil Lapsley.


# 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.

# (xover, xgtitle, xpath, date methods by Kevan Heydon)


# Imports
import re
import socket
import string


# Exception raised when an error or invalid response is received

error_reply = 'nntplib.error_reply'	# unexpected [123]xx reply
error_temp = 'nntplib.error_temp'	# 4xx errors
error_perm = 'nntplib.error_perm'	# 5xx errors
error_proto = 'nntplib.error_proto'	# response does not begin with [1-5]
error_data = 'nntplib.error_data'	# error in response data


# 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:

	# Initialize an instance.  Arguments:
	# - host: hostname to connect to
	# - port: port to connect to (default the standard NNTP port)

	def __init__(self, host, port = NNTP_PORT, user=None, password=None):
		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 user:
		    resp = self.shortcmd('authinfo user '+user)
		    if resp[:3] == '381':
			if not password:
			    raise error_reply, resp
			else:
			    resp = self.shortcmd('authinfo pass '+password)
			    if resp[:3] != '281':
				raise error_perm, 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):
		if self.debugging: print '*welcome*', `self.welcome`
		return self.welcome

	# 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

	def set_debuglevel(self, level):
		self.debugging = level
	debug = set_debuglevel

	# Internal: send one line to the server, appending CRLF
	def putline(self, line):
		line = line + CRLF
		if self.debugging > 1: print '*put*', `line`
		self.sock.send(line)

	# Internal: send one command to the server (through putline())
	def putcmd(self, line):
		if self.debugging: print '*cmd*', `line`
		self.putline(line)

	# Internal: return one line from the server, stripping CRLF.
	# Raise EOFError if the connection is closed
	def getline(self):
		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

	# Internal: get a response from the server.
	# Raise various errors if the response indicates an error
	def getresp(self):
		resp = self.getline()
		if self.debugging: print '*resp*', `resp`
		c = resp[:1]
		if c == '4':
			raise error_temp, resp
		if c == '5':
			raise error_perm, resp
		if c not in '123':
			raise error_proto, resp
		return resp

	# Internal: get a response plus following text from the server.
	# Raise various errors if the response indicates an error
	def getlongresp(self):
		resp = self.getresp()
		if resp[:3] not in LONGRESP:
			raise error_reply, resp
		list = []
		while 1:
			line = self.getline()
			if line == '.':
				break
			if line[:2] == '..':
				line = line[1:]
			list.append(line)
		return resp, list

	# Internal: send a command and get the response
	def shortcmd(self, line):
		self.putcmd(line)
		return self.getresp()

	# Internal: send a command and get the response plus following text
	def longcmd(self, line):
		self.putcmd(line)
		return self.getlongresp()

	# Process a NEWGROUPS command.  Arguments:
	# - date: string 'yymmdd' indicating the date
	# - time: string 'hhmmss' indicating the time
	# Return:
	# - resp: server response if succesful
	# - list: list of newsgroup names

	def newgroups(self, date, time):
		return self.longcmd('NEWGROUPS ' + 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 succesful
	# - list: list of article ids

	def newnews(self, group, date, time):
		cmd = 'NEWNEWS ' + group + ' ' + date + ' ' + time
		return self.longcmd(cmd)

	# Process a LIST command.  Return:
	# - resp: server response if succesful
	# - list: list of (group, last, first, flag) (strings)

	def list(self):
		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

	# Process a GROUP command.  Argument:
	# - group: the group name
	# Returns:
	# - resp: server response if succesful
	# - count: number of articles (string)
	# - first: first article number (string)
	# - last: last article number (string)
	# - name: the group name

	def group(self, name):
		resp = self.shortcmd('GROUP ' + name)
		if resp[:3] <> '211':
			raise error_reply, 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

	# Process a HELP command.  Returns:
	# - resp: server response if succesful
	# - list: list of strings

	def help(self):
		return self.longcmd('HELP')

	# Internal: parse the response of a STAT, NEXT or LAST command
	def statparse(self, resp):
		if resp[:2] <> '22':
			raise error_reply, resp
		words = string.split(resp)
		nr = 0
		id = ''
		n = len(words)
		if n > 1:
			nr = words[1]
			if n > 2:
				id = string.lower(words[2])
		return resp, nr, id

	# Internal: process a STAT, NEXT or LAST command
	def statcmd(self, line):
		resp = self.shortcmd(line)
		return self.statparse(resp)

	# Process a STAT command.  Argument:
	# - id: article number or message id
	# Returns:
	# - resp: server response if succesful
	# - nr:   the article number
	# - id:   the article id

	def stat(self, id):
		return self.statcmd('STAT ' + id)

	# Process a NEXT command.  No arguments.  Return as for STAT

	def next(self):
		return self.statcmd('NEXT')

	# Process a LAST command.  No arguments.  Return as for STAT

	def last(self):
		return self.statcmd('LAST')

	# Internal: process a HEAD, BODY or ARTICLE command
	def artcmd(self, line):
		resp, list = self.longcmd(line)
		resp, nr, id = self.statparse(resp)
		return resp, nr, id, list

	# Process a HEAD command.  Argument:
	# - id: article number or message id
	# Returns:
	# - resp: server response if succesful
	# - list: the lines of the article's header

	def head(self, id):
		return self.artcmd('HEAD ' + id)

	# Process a BODY command.  Argument:
	# - id: article number or message id
	# Returns:
	# - resp: server response if succesful
	# - list: the lines of the article's body

	def body(self, id):
		return self.artcmd('BODY ' + id)

	# Process an ARTICLE command.  Argument:
	# - id: article number or message id
	# Returns:
	# - resp: server response if succesful
	# - list: the lines of the article

	def article(self, id):
		return self.artcmd('ARTICLE ' + id)

	# Process a SLAVE command.  Returns:
	# - resp: server response if succesful

	def slave(self):
		return self.shortcmd('SLAVE')

	# 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 succesful
	# - list: list of (nr, value) strings

	def xhdr(self, hdr, str):
		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

	# Process an XOVER command (optional server extension) Arguments:
	# - start: start of range
	# - end: end of range
	# Returns:
	# - resp: server response if succesful
	# - list: list of (art-nr, subject, poster, date, id, refrences, size, lines)

	def xover(self,start,end):
		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 error_data,line
		return resp,xover_lines

	# Process an XGTITLE command (optional server extension) Arguments:
	# - group: group name wildcard (i.e. news.*)
	# Returns:
	# - resp: server response if succesful
	# - list: list of (name,title) strings

	def xgtitle(self, group):
		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

	# Process an XPATH command (optional server extension) Arguments:
	# - id: Message id of article
	# Returns:
	# resp: server response if succesful
	# path: directory path to article

	def xpath(self,id):
		resp = self.shortcmd("XPATH " + id)
		if resp[:3] <> '223':
			raise error_reply, resp
		try:
			[resp_num, path] = string.split(resp)
		except ValueError:
			raise error_reply, resp
		else:
			return resp, path

	# Process the DATE command. Arguments:
	# None
	# Returns:
	# resp: server response if succesful
	# date: Date suitable for newnews/newgroups commands etc.
	# time: Time suitable for newnews/newgroups commands etc.

	def date (self):
		resp = self.shortcmd("DATE")
		if resp[:3] <> '111':
			raise error_reply, resp
		elem = string.split(resp)
		if len(elem) != 2:
			raise error_data, resp
		date = elem[1][2:8]
		time = elem[1][-6:]
		if len(date) != 6 or len(time) != 6:
			raise error_data, resp
		return resp, date, time


	# Process a POST command.  Arguments:
	# - f: file containing the article
	# Returns:
	# - resp: server response if succesful

	def post(self, f):
		resp = self.shortcmd('POST')
		# Raises error_??? if posting is not allowed
		if resp[0] <> '3':
			raise error_reply, 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()

	# Process an IHAVE command.  Arguments:
	# - id: message-id of the article
	# - f:  file containing the article
	# Returns:
	# - resp: server response if succesful
	# Note that if the server refuses the article an exception is raised

	def ihave(self, id, f):
		resp = self.shortcmd('IHAVE ' + id)
		# Raises error_??? if the server already has it
		if resp[0] <> '3':
			raise error_reply, 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()

	 # Process a QUIT command and close the socket.  Returns:
	 # - resp: server response if succesful

	def quit(self):
		resp = self.shortcmd('QUIT')
		self.file.close()
		self.sock.close()
		del self.file, self.sock
		return resp


# Minimal test function
def _test():
	s = NNTP('news')
	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()
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.