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1 | from twisted.web import resource, server, static, error as http_error | |
2 | from twisted.names import client | |
3 | from twisted.internet import reactor, error | |
4 | from authgateengine import login_optional, getSessionData | |
5 | import md5, sys, os, time, config, qwebirc.config_options as config_options, traceback, socket | |
6 | import qwebirc.ircclient as ircclient | |
7 | from adminengine import AdminEngineAction | |
8 | from qwebirc.util import HitCounter | |
9 | import qwebirc.dns as qdns | |
10 | import qwebirc.util.qjson as json | |
11 | Sessions = {} | |
12 | ||
13 | def get_session_id(): | |
14 | return md5.md5(os.urandom(16)).hexdigest() | |
15 | ||
16 | class BufferOverflowException(Exception): | |
17 | pass | |
18 | ||
19 | class AJAXException(Exception): | |
20 | pass | |
21 | ||
22 | class IDGenerationException(Exception): | |
23 | pass | |
24 | ||
25 | class PassthruException(Exception): | |
26 | pass | |
27 | ||
28 | NOT_DONE_YET = None | |
29 | EMPTY_JSON_LIST = json.dumps([]) | |
30 | ||
31 | def jsondump(fn): | |
32 | def decorator(*args, **kwargs): | |
33 | try: | |
34 | x = fn(*args, **kwargs) | |
35 | if x is None: | |
36 | return server.NOT_DONE_YET | |
37 | x = (True, x) | |
38 | except AJAXException, e: | |
39 | x = (False, e[0]) | |
40 | except PassthruException, e: | |
41 | return str(e) | |
42 | ||
43 | return json.dumps(x) | |
44 | return decorator | |
45 | ||
46 | def cleanupSession(id): | |
47 | try: | |
48 | del Sessions[id] | |
49 | except KeyError: | |
50 | pass | |
51 | ||
52 | class IRCSession: | |
53 | def __init__(self, id): | |
54 | self.id = id | |
55 | self.subscriptions = [] | |
56 | self.buffer = [] | |
57 | self.buflen = 0 | |
58 | self.throttle = 0 | |
59 | self.schedule = None | |
60 | self.closed = False | |
61 | self.cleanupschedule = None | |
62 | ||
63 | def subscribe(self, channel, notifier): | |
64 | timeout_entry = reactor.callLater(config.HTTP_AJAX_REQUEST_TIMEOUT, self.timeout, channel) | |
65 | def cancel_timeout(result): | |
66 | if channel in self.subscriptions: | |
67 | self.subscriptions.remove(channel) | |
68 | try: | |
69 | timeout_entry.cancel() | |
70 | except error.AlreadyCalled: | |
71 | pass | |
72 | notifier.addCallbacks(cancel_timeout, cancel_timeout) | |
73 | ||
74 | if len(self.subscriptions) >= config.MAXSUBSCRIPTIONS: | |
75 | self.subscriptions.pop(0).close() | |
76 | ||
77 | self.subscriptions.append(channel) | |
78 | self.flush() | |
79 | ||
80 | def timeout(self, channel): | |
81 | if self.schedule: | |
82 | return | |
83 | ||
84 | channel.write(EMPTY_JSON_LIST) | |
85 | if channel in self.subscriptions: | |
86 | self.subscriptions.remove(channel) | |
87 | ||
88 | def flush(self, scheduled=False): | |
89 | if scheduled: | |
90 | self.schedule = None | |
91 | ||
92 | if not self.buffer or not self.subscriptions: | |
93 | return | |
94 | ||
95 | t = time.time() | |
96 | ||
97 | if t < self.throttle: | |
98 | if not self.schedule: | |
99 | self.schedule = reactor.callLater(self.throttle - t, self.flush, True) | |
100 | return | |
101 | else: | |
102 | # process the rest of the packet | |
103 | if not scheduled: | |
104 | if not self.schedule: | |
105 | self.schedule = reactor.callLater(0, self.flush, True) | |
106 | return | |
107 | ||
108 | self.throttle = t + config.UPDATE_FREQ | |
109 | ||
110 | encdata = json.dumps(self.buffer) | |
111 | self.buffer = [] | |
112 | self.buflen = 0 | |
113 | ||
114 | newsubs = [] | |
115 | for x in self.subscriptions: | |
116 | if x.write(encdata): | |
117 | newsubs.append(x) | |
118 | ||
119 | self.subscriptions = newsubs | |
120 | if self.closed and not self.subscriptions: | |
121 | cleanupSession(self.id) | |
122 | ||
123 | def event(self, data): | |
124 | newbuflen = self.buflen + len(data) | |
125 | if newbuflen > config.MAXBUFLEN: | |
126 | self.buffer = [] | |
127 | self.client.error("Buffer overflow.") | |
128 | return | |
129 | ||
130 | self.buffer.append(data) | |
131 | self.buflen = newbuflen | |
132 | self.flush() | |
133 | ||
134 | def push(self, data): | |
135 | if not self.closed: | |
136 | self.client.write(data) | |
137 | ||
138 | def disconnect(self): | |
139 | # keep the session hanging around for a few seconds so the | |
140 | # client has a chance to see what the issue was | |
141 | self.closed = True | |
142 | ||
143 | reactor.callLater(5, cleanupSession, self.id) | |
144 | ||
145 | # DANGER! Breach of encapsulation! | |
146 | def connect_notice(line): | |
147 | return "c", "NOTICE", "", ("AUTH", "*** (qwebirc) %s" % line) | |
148 | ||
149 | class Channel: | |
150 | def __init__(self, request): | |
151 | self.request = request | |
152 | ||
153 | class SingleUseChannel(Channel): | |
154 | def write(self, data): | |
155 | self.request.write(data) | |
156 | self.request.finish() | |
157 | return False | |
158 | ||
159 | def close(self): | |
160 | self.request.finish() | |
161 | ||
162 | class MultipleUseChannel(Channel): | |
163 | def write(self, data): | |
164 | self.request.write(data) | |
165 | return True | |
166 | ||
167 | class AJAXEngine(resource.Resource): | |
168 | isLeaf = True | |
169 | ||
170 | def __init__(self, prefix): | |
171 | self.prefix = prefix | |
172 | self.__connect_hit = HitCounter() | |
173 | self.__total_hit = HitCounter() | |
174 | ||
175 | @jsondump | |
176 | def render_POST(self, request): | |
177 | path = request.path[len(self.prefix):] | |
178 | if path[0] == "/": | |
179 | handler = self.COMMANDS.get(path[1:]) | |
180 | if handler is not None: | |
181 | return handler(self, request) | |
182 | ||
183 | raise PassthruException, http_error.NoResource().render(request) | |
184 | ||
185 | def newConnection(self, request): | |
186 | ticket = login_optional(request) | |
187 | ||
188 | ip = request.getClientIP() | |
189 | ||
190 | nick = request.args.get("nick") | |
191 | if not nick: | |
192 | raise AJAXException, "Nickname not supplied." | |
193 | nick = ircclient.irc_decode(nick[0]) | |
194 | ||
195 | password = request.args.get("password") | |
196 | if password is not None: | |
197 | password = ircclient.irc_decode(password[0]) | |
198 | ||
199 | for i in xrange(10): | |
200 | id = get_session_id() | |
201 | if not Sessions.get(id): | |
202 | break | |
203 | else: | |
204 | raise IDGenerationException() | |
205 | ||
206 | session = IRCSession(id) | |
207 | ||
208 | qticket = getSessionData(request).get("qticket") | |
209 | if qticket is None: | |
210 | perform = None | |
211 | else: | |
212 | service_mask = config.AUTH_SERVICE | |
213 | msg_mask = service_mask.split("!")[0] + "@" + service_mask.split("@", 1)[1] | |
214 | perform = ["PRIVMSG %s :TICKETAUTH %s" % (msg_mask, qticket)] | |
215 | ||
216 | ident, realname = config.IDENT, config.REALNAME | |
217 | if ident is config_options.IDENT_HEX or ident is None: # latter is legacy | |
218 | ident = socket.inet_aton(ip).encode("hex") | |
219 | elif ident is config_options.IDENT_NICKNAME: | |
220 | ident = nick | |
221 | ||
222 | self.__connect_hit() | |
223 | ||
224 | def proceed(hostname): | |
225 | kwargs = dict(nick=nick, ident=ident, ip=ip, realname=realname, perform=perform, hostname=hostname) | |
226 | if password is not None: | |
227 | kwargs["password"] = password | |
228 | ||
229 | client = ircclient.createIRC(session, **kwargs) | |
230 | session.client = client | |
231 | ||
232 | if not hasattr(config, "WEBIRC_MODE") or config.WEBIRC_MODE == "hmac": | |
233 | proceed(None) | |
234 | elif config.WEBIRC_MODE != "hmac": | |
235 | notice = lambda x: session.event(connect_notice(x)) | |
236 | notice("Looking up your hostname...") | |
237 | def callback(hostname): | |
238 | notice("Found your hostname.") | |
239 | proceed(hostname) | |
240 | def errback(failure): | |
241 | notice("Couldn't look up your hostname!") | |
242 | proceed(ip) | |
243 | qdns.lookupAndVerifyPTR(ip, timeout=[config.DNS_TIMEOUT]).addCallbacks(callback, errback) | |
244 | ||
245 | Sessions[id] = session | |
246 | ||
247 | return id | |
248 | ||
249 | def getSession(self, request): | |
250 | bad_session_message = "Invalid session, this most likely means the server has restarted; close this dialog and then try refreshing the page." | |
251 | ||
252 | sessionid = request.args.get("s") | |
253 | if sessionid is None: | |
254 | raise AJAXException, bad_session_message | |
255 | ||
256 | session = Sessions.get(sessionid[0]) | |
257 | if not session: | |
258 | raise AJAXException, bad_session_message | |
259 | return session | |
260 | ||
261 | def subscribe(self, request): | |
262 | request.channel.cancelTimeout() | |
263 | self.getSession(request).subscribe(SingleUseChannel(request), request.notifyFinish()) | |
264 | return NOT_DONE_YET | |
265 | ||
266 | def push(self, request): | |
267 | command = request.args.get("c") | |
268 | if command is None: | |
269 | raise AJAXException, "No command specified." | |
270 | self.__total_hit() | |
271 | ||
272 | decoded = ircclient.irc_decode(command[0]) | |
273 | ||
274 | session = self.getSession(request) | |
275 | ||
276 | if len(decoded) > config.MAXLINELEN: | |
277 | session.disconnect() | |
278 | raise AJAXException, "Line too long." | |
279 | ||
280 | try: | |
281 | session.push(decoded) | |
282 | except AttributeError: # occurs when we haven't noticed an error | |
283 | session.disconnect() | |
284 | raise AJAXException, "Connection closed by server; try reconnecting by reloading the page." | |
285 | except Exception, e: # catch all | |
286 | session.disconnect() | |
287 | traceback.print_exc(file=sys.stderr) | |
288 | raise AJAXException, "Unknown error." | |
289 | ||
290 | return True | |
291 | ||
292 | def closeById(self, k): | |
293 | s = Sessions.get(k) | |
294 | if s is None: | |
295 | return | |
296 | s.client.client.error("Closed by admin interface") | |
297 | ||
298 | @property | |
299 | def adminEngine(self): | |
300 | return { | |
301 | "Sessions": [(str(v.client.client), AdminEngineAction("close", self.closeById, k)) for k, v in Sessions.iteritems() if not v.closed], | |
302 | "Connections": [(self.__connect_hit,)], | |
303 | "Total hits": [(self.__total_hit,)], | |
304 | } | |
305 | ||
306 | COMMANDS = dict(p=push, n=newConnection, s=subscribe) | |
307 |