aboutsummaryrefslogtreecommitdiff
path: root/xmpp-vala/src/core/xmpp_stream.vala
blob: aff0b216c2c1e9ab928cbf75eb2b3c032cc1fb03 (plain) (blame)
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
using Gee;

namespace Xmpp {

public errordomain IOStreamError {
    READ,
    WRITE,
    CONNECT,
    DISCONNECT,
    TLS
}

public class XmppStream {
    public const string NS_URI = "http://etherx.jabber.org/streams";

    public Jid remote_name;
    public XmppLog log = new XmppLog();
    public StanzaNode? features { get; private set; default = new StanzaNode.build("features", NS_URI); }

    private IOStream? stream;
    private StanzaReader? reader;
    private StanzaWriter? writer;

    public Gee.List<XmppStreamFlag> flags { get; private set; default=new ArrayList<XmppStreamFlag>(); }
    public Gee.List<XmppStreamModule> modules { get; private set; default=new ArrayList<XmppStreamModule>(); }
    private Gee.List<ConnectionProvider> connection_providers = new ArrayList<ConnectionProvider>();
    public bool negotiation_complete { get; set; default=false; }
    private bool setup_needed = false;
    private bool non_negotiation_modules_attached = false;

    public signal void received_node(XmppStream stream, StanzaNode node);
    public signal void received_root_node(XmppStream stream, StanzaNode node);
    public signal void received_features_node(XmppStream stream);
    public signal void received_message_stanza(XmppStream stream, StanzaNode node);
    public signal void received_presence_stanza(XmppStream stream, StanzaNode node);
    public signal void received_iq_stanza(XmppStream stream, StanzaNode node);
    public signal void received_nonza(XmppStream stream, StanzaNode node);
    public signal void stream_negotiated(XmppStream stream);
    public signal void attached_modules(XmppStream stream);

    public XmppStream() {
        register_connection_provider(new StartTlsConnectionProvider());
    }

    public async void connect(string? remote_name = null) throws IOStreamError {
        if (remote_name != null) this.remote_name = Jid.parse(remote_name);
        attach_negotation_modules();
        try {
            int min_priority = -1;
            ConnectionProvider? best_provider = null;
            foreach (ConnectionProvider connection_provider in connection_providers) {
                int? priority = yield connection_provider.get_priority(this.remote_name);
                if (priority != null && (priority < min_priority || min_priority == -1)) {
                    min_priority = priority;
                    best_provider = connection_provider;
                }
            }
            IOStream? stream = null;
            if (best_provider != null) {
                stream = yield best_provider.connect(this);
            }
            if (stream == null) {
                stream = yield (new SocketClient()).connect_async(new NetworkService("xmpp-client", "tcp", this.remote_name.to_string()));
            }
            if (stream == null) {
                throw new IOStreamError.CONNECT("client.connect() returned null");
            }
            reset_stream((!)stream);
        } catch (Error e) {
            debug("[%p] Could not connect to server", this);
            throw new IOStreamError.CONNECT(e.message);
        }
        yield loop();
    }

    public void disconnect() throws IOStreamError {
        StanzaWriter? writer = this.writer;
        StanzaReader? reader = this.reader;
        IOStream? stream = this.stream;
        if (writer == null || reader == null || stream == null) throw new IOStreamError.DISCONNECT("trying to disconnect, but no stream open");
        log.str("OUT", "</stream:stream>");
        ((!)writer).write.begin("</stream:stream>");
        ((!)reader).cancel();
        ((!)stream).close_async.begin();
    }

    public void reset_stream(IOStream stream) {
        this.stream = stream;
        reader = new StanzaReader.for_stream(stream.input_stream);
        writer = new StanzaWriter.for_stream(stream.output_stream);
        require_setup();
    }

    public void require_setup() {
        setup_needed = true;
    }

    public bool is_setup_needed() {
        return setup_needed;
    }

    public async StanzaNode read() throws IOStreamError {
        StanzaReader? reader = this.reader;
        if (reader == null) throw new IOStreamError.READ("trying to read, but no stream open");
        try {
            StanzaNode node = yield ((!)reader).read_node();
            log.node("IN", node);
            return node;
        } catch (XmlError e) {
            throw new IOStreamError.READ(e.message);
        }
    }

    public void write(StanzaNode node) {
        write_async.begin(node);
    }

    public async void write_async(StanzaNode node) throws IOStreamError {
        StanzaWriter? writer = this.writer;
        if (writer == null) throw new IOStreamError.WRITE("trying to write, but no stream open");
        try {
            log.node("OUT", node);
            yield ((!)writer).write_node(node);
        } catch (XmlError e) {
            throw new IOStreamError.WRITE(e.message);
        }
    }

    internal IOStream? get_stream() {
        return stream;
    }

    public void add_flag(XmppStreamFlag flag) {
        flags.add(flag);
    }

    public bool has_flag<T>(FlagIdentity<T>? identity) {
        return get_flag(identity) != null;
    }

    public T? get_flag<T>(FlagIdentity<T>? identity) {
        if (identity == null) return null;
        foreach (var flag in flags) {
            if (((!)identity).matches(flag)) return ((!)identity).cast(flag);
        }
        return null;
    }

    public void remove_flag(XmppStreamFlag flag) {
        flags.remove(flag);
    }

    public XmppStream add_module(XmppStreamModule module) {
        foreach (XmppStreamModule m in modules) {
            if (m.get_ns() == module.get_ns() && m.get_id() == module.get_id()) {
                warning("[%p] Adding already added module: %s\n", this, module.get_id());
                return this;
            }
        }
        modules.add(module);
        if (negotiation_complete) module.attach(this);
        return this;
    }

    public void detach_modules() {
        foreach (XmppStreamModule module in modules) {
            if (!(module is XmppStreamNegotiationModule) && !negotiation_complete) continue;
            module.detach(this);
        }
    }

    public T? get_module<T>(ModuleIdentity<T>? identity) {
        if (identity == null) return null;
        foreach (var module in modules) {
            if (((!)identity).matches(module)) return ((!)identity).cast(module);
        }
        return null;
    }

    public void register_connection_provider(ConnectionProvider connection_provider) {
        connection_providers.add(connection_provider);
    }

    public bool is_negotiation_active() {
        foreach (XmppStreamModule module in modules) {
            if (module is XmppStreamNegotiationModule) {
                XmppStreamNegotiationModule negotiation_module = (XmppStreamNegotiationModule) module;
                if (negotiation_module.negotiation_active(this)) return true;
            }
        }
        return false;
    }

    private async void setup() throws IOStreamError {
        StanzaNode outs = new StanzaNode.build("stream", "http://etherx.jabber.org/streams")
                            .put_attribute("to", remote_name.to_string())
                            .put_attribute("version", "1.0")
                            .put_attribute("xmlns", "jabber:client")
                            .put_attribute("stream", "http://etherx.jabber.org/streams", XMLNS_URI);
        outs.has_nodes = true;
        log.node("OUT ROOT", outs);
        write(outs);
        received_root_node(this, yield read_root());
    }

    private async void loop() throws IOStreamError {
        while (true) {
            if (setup_needed) {
                yield setup();
                setup_needed = false;
            }

            StanzaNode node = yield read();

            Idle.add(loop.callback);
            yield;

            received_node(this, node);

            if (node.ns_uri == NS_URI && node.name == "features") {
                features = node;
                received_features_node(this);
            } else if (node.ns_uri == NS_URI && node.name == "stream" && node.pseudo) {
                debug("[%p] Server closed stream", this);
                disconnect();
                return;
            } else if (node.ns_uri == JABBER_URI) {
                if (node.name == "message") {
                    received_message_stanza(this, node);
                } else if (node.name == "presence") {
                    received_presence_stanza(this, node);
                } else if (node.name == "iq") {
                    received_iq_stanza(this, node);
                } else {
                    received_nonza(this, node);
                }
            } else {
                received_nonza(this, node);
            }

            if (!non_negotiation_modules_attached && negotiation_modules_done()) {
                attach_non_negotation_modules();
                non_negotiation_modules_attached = true;
                if (!negotiation_complete) {
                    stream_negotiated(this);
                    negotiation_complete = true;
                }
            }
        }
    }

    private bool negotiation_modules_done() throws IOStreamError {
        if (setup_needed) return false;
        if (is_negotiation_active()) return false;

        foreach (XmppStreamModule module in modules) {
            if (module is XmppStreamNegotiationModule) {
                XmppStreamNegotiationModule negotiation_module = (XmppStreamNegotiationModule) module;
                if (negotiation_module.mandatory_outstanding(this)) {
                    throw new IOStreamError.CONNECT("mandatory-to-negotiate feature not negotiated: " + negotiation_module.get_id());
                }
            }
        }
        return true;
    }

    private void attach_non_negotation_modules() {
        foreach (XmppStreamModule module in modules) {
            if (module as XmppStreamNegotiationModule == null) {
                module.attach(this);
            }
        }
        attached_modules(this);
    }

    private void attach_negotation_modules() {
        foreach (XmppStreamModule module in modules) {
            if (module as XmppStreamNegotiationModule != null) {
                module.attach(this);
            }
        }
    }

    private async StanzaNode read_root() throws IOStreamError {
        StanzaReader? reader = this.reader;
        if (reader == null) throw new IOStreamError.READ("trying to read, but no stream open");
        try {
            StanzaNode node = yield ((!)reader).read_root_node();
            log.node("IN ROOT", node);
            return node;
        } catch (XmlError.TLS e) {
            throw new IOStreamError.TLS(e.message);
        } catch (Error e) {
            throw new IOStreamError.READ(e.message);
        }
    }
}

public class FlagIdentity<T> : Object {
    public string ns { get; private set; }
    public string id { get; private set; }

    public FlagIdentity(string ns, string id) {
        this.ns = ns;
        this.id = id;
    }

    public T? cast(XmppStreamFlag flag) {
        return flag.get_type().is_a(typeof(T)) ? (T?) flag : null;
    }

    public bool matches(XmppStreamFlag module) {
        return module.get_ns() == ns && module.get_id() == id;
    }
}

public abstract class XmppStreamFlag : Object {
    public abstract string get_ns();

    public abstract string get_id();
}

public class ModuleIdentity<T> : Object {
    public string ns { get; private set; }
    public string id { get; private set; }

    public ModuleIdentity(string ns, string id) {
        this.ns = ns;
        this.id = id;
    }

    public T? cast(XmppStreamModule module) {
        return module.get_type().is_a(typeof(T)) ? (T?) module : null;
    }

    public bool matches(XmppStreamModule module) {
        return module.get_ns() == ns && module.get_id() == id;
    }
}

public abstract class XmppStreamModule : Object {
    public abstract void attach(XmppStream stream);

    public abstract void detach(XmppStream stream);

    public abstract string get_ns();

    public abstract string get_id();
}

public abstract class XmppStreamNegotiationModule : XmppStreamModule {
    public abstract bool mandatory_outstanding(XmppStream stream);

    public abstract bool negotiation_active(XmppStream stream);
}

public abstract class ConnectionProvider {
    public async abstract int? get_priority(Jid remote_name);
    public async abstract IOStream? connect(XmppStream stream);
    public abstract string get_id();
}

public class StartTlsConnectionProvider : ConnectionProvider {
    private SrvTarget? srv_target;

    public async override int? get_priority(Jid remote_name) {
        GLib.List<SrvTarget>? xmpp_target = null;
        try {
            GLibFixes.Resolver resolver = GLibFixes.Resolver.get_default();
            xmpp_target = yield resolver.lookup_service_async("xmpp-client", "tcp", remote_name.to_string(), null);
        } catch (Error e) {
            return null;
        }
        xmpp_target.sort((a, b) => { return a.get_priority() - b.get_priority(); });
        srv_target = xmpp_target.nth(0).data;
        return xmpp_target.nth(0).data.get_priority();
    }

    public async override IOStream? connect(XmppStream stream) {
        try {
            SocketClient client = new SocketClient();
            return yield client.connect_to_host_async(srv_target.get_hostname(), srv_target.get_port());
        } catch (Error e) {
            return null;
        }
    }

    public override string get_id() { return "start_tls"; }
}

}