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1 | from twisted.web import resource, server, static | |
2 | from twisted.names import client | |
3 | from twisted.internet import reactor | |
4 | from authgateengine import login_optional, getSessionData | |
5 | import simplejson, md5, sys, os, ircclient, time, config, weakref, traceback | |
6 | ||
7 | Sessions = {} | |
8 | ||
9 | def get_session_id(): | |
10 | return md5.md5(os.urandom(16)).hexdigest() | |
11 | ||
12 | class BufferOverflowException(Exception): | |
13 | pass | |
14 | ||
15 | class AJAXException(Exception): | |
16 | pass | |
17 | ||
18 | class IDGenerationException(Exception): | |
19 | pass | |
20 | ||
21 | NOT_DONE_YET = None | |
22 | ||
23 | def jsondump(fn): | |
24 | def decorator(*args, **kwargs): | |
25 | try: | |
26 | x = fn(*args, **kwargs) | |
27 | if x is None: | |
28 | return server.NOT_DONE_YET | |
29 | x = (True, x) | |
30 | except AJAXException, e: | |
31 | x = (False, e[0]) | |
32 | ||
33 | return simplejson.dumps(x) | |
34 | return decorator | |
35 | ||
36 | def cleanupSession(id): | |
37 | try: | |
38 | del Sessions[id] | |
39 | except KeyError: | |
40 | pass | |
41 | ||
42 | class IRCSession: | |
43 | def __init__(self, id): | |
44 | self.id = id | |
45 | self.subscriptions = [] | |
46 | self.buffer = [] | |
47 | self.throttle = 0 | |
48 | self.schedule = None | |
49 | self.closed = False | |
50 | self.cleanupschedule = None | |
51 | ||
52 | def subscribe(self, channel): | |
53 | if len(self.subscriptions) >= config.MAXSUBSCRIPTIONS: | |
54 | self.subscriptions.pop(0).close() | |
55 | ||
56 | self.subscriptions.append(channel) | |
57 | self.flush() | |
58 | ||
59 | def flush(self, scheduled=False): | |
60 | if scheduled: | |
61 | self.schedule = None | |
62 | ||
63 | if not self.buffer or not self.subscriptions: | |
64 | return | |
65 | ||
66 | t = time.time() | |
67 | ||
68 | if t < self.throttle: | |
69 | if not self.schedule: | |
70 | self.schedule = reactor.callLater(self.throttle - t, self.flush, True) | |
71 | return | |
72 | else: | |
73 | # process the rest of the packet | |
74 | if not scheduled: | |
75 | if not self.schedule: | |
76 | self.schedule = reactor.callLater(0, self.flush, True) | |
77 | return | |
78 | ||
79 | self.throttle = t + config.UPDATE_FREQ | |
80 | ||
81 | encdata = simplejson.dumps(self.buffer) | |
82 | self.buffer = [] | |
83 | ||
84 | newsubs = [] | |
85 | for x in self.subscriptions: | |
86 | if x.write(encdata): | |
87 | newsubs.append(x) | |
88 | ||
89 | self.subscriptions = newsubs | |
90 | if self.closed and not self.subscriptions: | |
91 | cleanupSession(self.id) | |
92 | ||
93 | def event(self, data): | |
94 | bufferlen = sum(map(len, self.buffer)) | |
95 | if bufferlen + len(data) > config.MAXBUFLEN: | |
96 | self.buffer = [] | |
97 | self.client.error("Buffer overflow") | |
98 | return | |
99 | ||
100 | self.buffer.append(data) | |
101 | self.flush() | |
102 | ||
103 | def push(self, data): | |
104 | if not self.closed: | |
105 | self.client.write(data) | |
106 | ||
107 | def disconnect(self): | |
108 | # keep the session hanging around for a few seconds so the | |
109 | # client has a chance to see what the issue was | |
110 | self.closed = True | |
111 | ||
112 | reactor.callLater(5, cleanupSession, self.id) | |
113 | ||
114 | class Channel: | |
115 | def __init__(self, request): | |
116 | self.request = request | |
117 | ||
118 | class SingleUseChannel(Channel): | |
119 | def write(self, data): | |
120 | self.request.write(data) | |
121 | self.request.finish() | |
122 | return False | |
123 | ||
124 | def close(self): | |
125 | self.request.finish() | |
126 | ||
127 | class MultipleUseChannel(Channel): | |
128 | def write(self, data): | |
129 | self.request.write(data) | |
130 | return True | |
131 | ||
132 | class AJAXEngine(resource.Resource): | |
133 | isLeaf = True | |
134 | ||
135 | def __init__(self, prefix): | |
136 | self.prefix = prefix | |
137 | ||
138 | @jsondump | |
139 | def render_POST(self, request): | |
140 | path = request.path[len(self.prefix):] | |
141 | if path[0] == "/": | |
142 | handler = self.COMMANDS.get(path[1:]) | |
143 | if handler is not None: | |
144 | return handler(self, request) | |
145 | raise AJAXException("404") | |
146 | ||
147 | # def render_GET(self, request): | |
148 | # return self.render_POST(request) | |
149 | ||
150 | def newConnection(self, request): | |
151 | ticket = login_optional(request) | |
152 | ||
153 | _, ip, port = request.transport.getPeer() | |
154 | ||
155 | nick, ident, realname = request.args.get("nick"), "webchat", config.REALNAME | |
156 | ||
157 | if not nick: | |
158 | raise AJAXException("Nickname not supplied") | |
159 | ||
160 | nick = nick[0] | |
161 | ||
162 | for i in xrange(10): | |
163 | id = get_session_id() | |
164 | if not Sessions.get(id): | |
165 | break | |
166 | else: | |
167 | raise IDGenerationException() | |
168 | ||
169 | session = IRCSession(id) | |
170 | ||
171 | qticket = getSessionData(request).get("qticket") | |
172 | if qticket is None: | |
173 | perform = None | |
174 | else: | |
175 | perform = ["PRIVMSG %s :TICKETAUTH %s" % (config.QBOT, qticket)] | |
176 | ||
177 | client = ircclient.createIRC(session, nick=nick, ident=ident, ip=ip, realname=realname, perform=perform) | |
178 | session.client = client | |
179 | ||
180 | Sessions[id] = session | |
181 | ||
182 | return id | |
183 | ||
184 | def getSession(self, request): | |
185 | sessionid = request.args.get("s") | |
186 | if sessionid is None: | |
187 | raise AJAXException("Bad session ID") | |
188 | ||
189 | session = Sessions.get(sessionid[0]) | |
190 | if not session: | |
191 | raise AJAXException("Bad session ID") | |
192 | return session | |
193 | ||
194 | def subscribe(self, request): | |
195 | self.getSession(request).subscribe(SingleUseChannel(request)) | |
196 | return NOT_DONE_YET | |
197 | ||
198 | def push(self, request): | |
199 | command = request.args.get("c") | |
200 | if command is None: | |
201 | raise AJAXException("No command specified") | |
202 | ||
203 | command = command[0] | |
204 | ||
205 | session = self.getSession(request) | |
206 | ||
207 | try: | |
208 | decoded = command.decode("utf-8") | |
209 | except UnicodeDecodeError: | |
210 | decoded = command.decode("iso-8859-1", "ignore") | |
211 | ||
212 | if len(decoded) > config.MAXLINELEN: | |
213 | session.disconnect() | |
214 | raise AJAXException("Line too long") | |
215 | ||
216 | try: | |
217 | session.push(decoded) | |
218 | except AttributeError: # occurs when we haven't noticed an error | |
219 | session.disconnect() | |
220 | raise AJAXException("Connection closed by server.") | |
221 | except Exception, e: # catch all | |
222 | session.disconnect() | |
223 | traceback.print_exc(file=sys.stderr) | |
224 | raise AJAXException("Unknown error.") | |
225 | ||
226 | return True | |
227 | ||
228 | COMMANDS = dict(p=push, n=newConnection, s=subscribe) | |
229 |