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1 | from twisted.web import resource, server, static | |
2 | from twisted.names import client | |
3 | from twisted.internet import reactor, error | |
4 | from authgateengine import login_optional, getSessionData | |
5 | import simplejson, md5, sys, os, time, config, weakref, traceback | |
6 | import qwebirc.ircclient as ircclient | |
7 | from adminengine import AdminEngineAction | |
8 | from qwebirc.util import HitCounter | |
9 | ||
10 | Sessions = {} | |
11 | ||
12 | def get_session_id(): | |
13 | return md5.md5(os.urandom(16)).hexdigest() | |
14 | ||
15 | class BufferOverflowException(Exception): | |
16 | pass | |
17 | ||
18 | class AJAXException(Exception): | |
19 | pass | |
20 | ||
21 | class IDGenerationException(Exception): | |
22 | pass | |
23 | ||
24 | NOT_DONE_YET = None | |
25 | ||
26 | def jsondump(fn): | |
27 | def decorator(*args, **kwargs): | |
28 | try: | |
29 | x = fn(*args, **kwargs) | |
30 | if x is None: | |
31 | return server.NOT_DONE_YET | |
32 | x = (True, x) | |
33 | except AJAXException, e: | |
34 | x = (False, e[0]) | |
35 | ||
36 | return simplejson.dumps(x) | |
37 | return decorator | |
38 | ||
39 | def cleanupSession(id): | |
40 | try: | |
41 | del Sessions[id] | |
42 | except KeyError: | |
43 | pass | |
44 | ||
45 | class IRCSession: | |
46 | def __init__(self, id): | |
47 | self.id = id | |
48 | self.subscriptions = [] | |
49 | self.buffer = [] | |
50 | self.throttle = 0 | |
51 | self.schedule = None | |
52 | self.closed = False | |
53 | self.cleanupschedule = None | |
54 | ||
55 | def subscribe(self, channel, notifier): | |
56 | timeout_entry = reactor.callLater(config.HTTP_AJAX_REQUEST_TIMEOUT, self.timeout, channel) | |
57 | def cancel_timeout(result): | |
58 | if channel in self.subscriptions: | |
59 | self.subscriptions.remove(channel) | |
60 | try: | |
61 | timeout_entry.cancel() | |
62 | except error.AlreadyCalled: | |
63 | pass | |
64 | notifier.addCallbacks(cancel_timeout, cancel_timeout) | |
65 | ||
66 | if len(self.subscriptions) >= config.MAXSUBSCRIPTIONS: | |
67 | self.subscriptions.pop(0).close() | |
68 | ||
69 | self.subscriptions.append(channel) | |
70 | self.flush() | |
71 | ||
72 | def timeout(self, channel): | |
73 | if self.schedule: | |
74 | return | |
75 | ||
76 | channel.write(simplejson.dumps([])) | |
77 | if channel in self.subscriptions: | |
78 | self.subscriptions.remove(channel) | |
79 | ||
80 | def flush(self, scheduled=False): | |
81 | if scheduled: | |
82 | self.schedule = None | |
83 | ||
84 | if not self.buffer or not self.subscriptions: | |
85 | return | |
86 | ||
87 | t = time.time() | |
88 | ||
89 | if t < self.throttle: | |
90 | if not self.schedule: | |
91 | self.schedule = reactor.callLater(self.throttle - t, self.flush, True) | |
92 | return | |
93 | else: | |
94 | # process the rest of the packet | |
95 | if not scheduled: | |
96 | if not self.schedule: | |
97 | self.schedule = reactor.callLater(0, self.flush, True) | |
98 | return | |
99 | ||
100 | self.throttle = t + config.UPDATE_FREQ | |
101 | ||
102 | encdata = simplejson.dumps(self.buffer) | |
103 | self.buffer = [] | |
104 | ||
105 | newsubs = [] | |
106 | for x in self.subscriptions: | |
107 | if x.write(encdata): | |
108 | newsubs.append(x) | |
109 | ||
110 | self.subscriptions = newsubs | |
111 | if self.closed and not self.subscriptions: | |
112 | cleanupSession(self.id) | |
113 | ||
114 | def event(self, data): | |
115 | bufferlen = sum(map(len, self.buffer)) | |
116 | if bufferlen + len(data) > config.MAXBUFLEN: | |
117 | self.buffer = [] | |
118 | self.client.error("Buffer overflow") | |
119 | return | |
120 | ||
121 | self.buffer.append(data) | |
122 | self.flush() | |
123 | ||
124 | def push(self, data): | |
125 | if not self.closed: | |
126 | self.client.write(data) | |
127 | ||
128 | def disconnect(self): | |
129 | # keep the session hanging around for a few seconds so the | |
130 | # client has a chance to see what the issue was | |
131 | self.closed = True | |
132 | ||
133 | reactor.callLater(5, cleanupSession, self.id) | |
134 | ||
135 | class Channel: | |
136 | def __init__(self, request): | |
137 | self.request = request | |
138 | ||
139 | class SingleUseChannel(Channel): | |
140 | def write(self, data): | |
141 | self.request.write(data) | |
142 | self.request.finish() | |
143 | return False | |
144 | ||
145 | def close(self): | |
146 | self.request.finish() | |
147 | ||
148 | class MultipleUseChannel(Channel): | |
149 | def write(self, data): | |
150 | self.request.write(data) | |
151 | return True | |
152 | ||
153 | class AJAXEngine(resource.Resource): | |
154 | isLeaf = True | |
155 | ||
156 | def __init__(self, prefix): | |
157 | self.prefix = prefix | |
158 | self.__connect_hit = HitCounter() | |
159 | self.__total_hit = HitCounter() | |
160 | ||
161 | @jsondump | |
162 | def render_POST(self, request): | |
163 | path = request.path[len(self.prefix):] | |
164 | if path[0] == "/": | |
165 | handler = self.COMMANDS.get(path[1:]) | |
166 | if handler is not None: | |
167 | return handler(self, request) | |
168 | raise AJAXException("404") | |
169 | ||
170 | # def render_GET(self, request): | |
171 | # return self.render_POST(request) | |
172 | ||
173 | def newConnection(self, request): | |
174 | ticket = login_optional(request) | |
175 | ||
176 | _, ip, port = request.transport.getPeer() | |
177 | ||
178 | nick = request.args.get("nick") | |
179 | if not nick: | |
180 | raise AJAXException("Nickname not supplied") | |
181 | nick = ircclient.irc_decode(nick[0]) | |
182 | ||
183 | ident, realname = "webchat", config.REALNAME | |
184 | ||
185 | for i in xrange(10): | |
186 | id = get_session_id() | |
187 | if not Sessions.get(id): | |
188 | break | |
189 | else: | |
190 | raise IDGenerationException() | |
191 | ||
192 | session = IRCSession(id) | |
193 | ||
194 | qticket = getSessionData(request).get("qticket") | |
195 | if qticket is None: | |
196 | perform = None | |
197 | else: | |
198 | perform = ["PRIVMSG %s :TICKETAUTH %s" % (config.QBOT, qticket)] | |
199 | ||
200 | self.__connect_hit() | |
201 | client = ircclient.createIRC(session, nick=nick, ident=ident, ip=ip, realname=realname, perform=perform) | |
202 | session.client = client | |
203 | ||
204 | Sessions[id] = session | |
205 | ||
206 | return id | |
207 | ||
208 | def getSession(self, request): | |
209 | sessionid = request.args.get("s") | |
210 | if sessionid is None: | |
211 | raise AJAXException("Bad session ID") | |
212 | ||
213 | session = Sessions.get(sessionid[0]) | |
214 | if not session: | |
215 | raise AJAXException("Bad session ID") | |
216 | return session | |
217 | ||
218 | def subscribe(self, request): | |
219 | request.channel.cancelTimeout() | |
220 | self.getSession(request).subscribe(SingleUseChannel(request), request.notifyFinish()) | |
221 | return NOT_DONE_YET | |
222 | ||
223 | def push(self, request): | |
224 | command = request.args.get("c") | |
225 | if command is None: | |
226 | raise AJAXException("No command specified") | |
227 | self.__total_hit() | |
228 | ||
229 | decoded = ircclient.irc_decode(command[0]) | |
230 | ||
231 | session = self.getSession(request) | |
232 | ||
233 | if len(decoded) > config.MAXLINELEN: | |
234 | session.disconnect() | |
235 | raise AJAXException("Line too long") | |
236 | ||
237 | try: | |
238 | session.push(decoded) | |
239 | except AttributeError: # occurs when we haven't noticed an error | |
240 | session.disconnect() | |
241 | raise AJAXException("Connection closed by server.") | |
242 | except Exception, e: # catch all | |
243 | session.disconnect() | |
244 | traceback.print_exc(file=sys.stderr) | |
245 | raise AJAXException("Unknown error.") | |
246 | ||
247 | return True | |
248 | ||
249 | def closeById(self, k): | |
250 | s = Sessions.get(k) | |
251 | if s is None: | |
252 | return | |
253 | s.client.client.error("Closed by admin interface") | |
254 | ||
255 | @property | |
256 | def adminEngine(self): | |
257 | return { | |
258 | "Sessions": [(str(v.client.client), AdminEngineAction("close", self.closeById, k)) for k, v in Sessions.iteritems() if not v.closed], | |
259 | "Connections": [(self.__connect_hit,)], | |
260 | "Total hits": [(self.__total_hit,)], | |
261 | } | |
262 | ||
263 | COMMANDS = dict(p=push, n=newConnection, s=subscribe) | |
264 |