summary refs log tree commit diff
path: root/synapse/types.py
blob: cc7c182a78f476ec8a038ea7f9e28d230c67963c (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
392
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import string

from synapse.api.errors import SynapseError

from collections import namedtuple


class Requester(namedtuple("Requester", [
    "user", "access_token_id", "is_guest", "device_id", "app_service",
])):
    """
    Represents the user making a request

    Attributes:
        user (UserID):  id of the user making the request
        access_token_id (int|None):  *ID* of the access token used for this
            request, or None if it came via the appservice API or similar
        is_guest (bool):  True if the user making this request is a guest user
        device_id (str|None):  device_id which was set at authentication time
        app_service (ApplicationService|None):  the AS requesting on behalf of the user
    """

    def serialize(self):
        """Converts self to a type that can be serialized as JSON, and then
        deserialized by `deserialize`

        Returns:
            dict
        """
        return {
            "user_id": self.user.to_string(),
            "access_token_id": self.access_token_id,
            "is_guest": self.is_guest,
            "device_id": self.device_id,
            "app_server_id": self.app_service.id if self.app_service else None,
        }

    @staticmethod
    def deserialize(store, input):
        """Converts a dict that was produced by `serialize` back into a
        Requester.

        Args:
            store (DataStore): Used to convert AS ID to AS object
            input (dict): A dict produced by `serialize`

        Returns:
            Requester
        """
        appservice = None
        if input["app_server_id"]:
            appservice = store.get_app_service_by_id(input["app_server_id"])

        return Requester(
            user=UserID.from_string(input["user_id"]),
            access_token_id=input["access_token_id"],
            is_guest=input["is_guest"],
            device_id=input["device_id"],
            app_service=appservice,
        )


def create_requester(user_id, access_token_id=None, is_guest=False,
                     device_id=None, app_service=None):
    """
    Create a new ``Requester`` object

    Args:
        user_id (str|UserID):  id of the user making the request
        access_token_id (int|None):  *ID* of the access token used for this
            request, or None if it came via the appservice API or similar
        is_guest (bool):  True if the user making this request is a guest user
        device_id (str|None):  device_id which was set at authentication time
        app_service (ApplicationService|None):  the AS requesting on behalf of the user

    Returns:
        Requester
    """
    if not isinstance(user_id, UserID):
        user_id = UserID.from_string(user_id)
    return Requester(user_id, access_token_id, is_guest, device_id, app_service)


def get_domain_from_id(string):
    idx = string.find(":")
    if idx == -1:
        raise SynapseError(400, "Invalid ID: %r" % (string,))
    return string[idx + 1:]


def get_localpart_from_id(string):
    idx = string.find(":")
    if idx == -1:
        raise SynapseError(400, "Invalid ID: %r" % (string,))
    return string[1:idx]


class DomainSpecificString(
        namedtuple("DomainSpecificString", ("localpart", "domain"))
):
    """Common base class among ID/name strings that have a local part and a
    domain name, prefixed with a sigil.

    Has the fields:

        'localpart' : The local part of the name (without the leading sigil)
        'domain' : The domain part of the name
    """

    # Deny iteration because it will bite you if you try to create a singleton
    # set by:
    #    users = set(user)
    def __iter__(self):
        raise ValueError("Attempted to iterate a %s" % (type(self).__name__,))

    # Because this class is a namedtuple of strings and booleans, it is deeply
    # immutable.
    def __copy__(self):
        return self

    def __deepcopy__(self, memo):
        return self

    @classmethod
    def from_string(cls, s):
        """Parse the string given by 's' into a structure object."""
        if len(s) < 1 or s[0] != cls.SIGIL:
            raise SynapseError(400, "Expected %s string to start with '%s'" % (
                cls.__name__, cls.SIGIL,
            ))

        parts = s[1:].split(':', 1)
        if len(parts) != 2:
            raise SynapseError(
                400, "Expected %s of the form '%slocalname:domain'" % (
                    cls.__name__, cls.SIGIL,
                )
            )

        domain = parts[1]

        # This code will need changing if we want to support multiple domain
        # names on one HS
        return cls(localpart=parts[0], domain=domain)

    def to_string(self):
        """Return a string encoding the fields of the structure object."""
        return "%s%s:%s" % (self.SIGIL, self.localpart, self.domain)

    @classmethod
    def is_valid(cls, s):
        try:
            cls.from_string(s)
            return True
        except Exception:
            return False

    __repr__ = to_string


class UserID(DomainSpecificString):
    """Structure representing a user ID."""
    SIGIL = "@"


class RoomAlias(DomainSpecificString):
    """Structure representing a room name."""
    SIGIL = "#"


class RoomID(DomainSpecificString):
    """Structure representing a room id. """
    SIGIL = "!"


class EventID(DomainSpecificString):
    """Structure representing an event id. """
    SIGIL = "$"


class GroupID(DomainSpecificString):
    """Structure representing a group ID."""
    SIGIL = "+"

    @classmethod
    def from_string(cls, s):
        group_id = super(GroupID, cls).from_string(s)
        if not group_id.localpart:
            raise SynapseError(
                400,
                "Group ID cannot be empty",
            )

        if contains_invalid_mxid_characters(group_id.localpart):
            raise SynapseError(
                400,
                "Group ID can only contain characters a-z, 0-9, or '=_-./'",
            )

        return group_id


mxid_localpart_allowed_characters = set("_-./=" + string.ascii_lowercase + string.digits)


def contains_invalid_mxid_characters(localpart):
    """Check for characters not allowed in an mxid or groupid localpart

    Args:
        localpart (basestring): the localpart to be checked

    Returns:
        bool: True if there are any naughty characters
    """
    return any(c not in mxid_localpart_allowed_characters for c in localpart)


class StreamToken(
    namedtuple("Token", (
        "room_key",
        "presence_key",
        "typing_key",
        "receipt_key",
        "account_data_key",
        "push_rules_key",
        "to_device_key",
        "device_list_key",
        "groups_key",
    ))
):
    _SEPARATOR = "_"

    @classmethod
    def from_string(cls, string):
        try:
            keys = string.split(cls._SEPARATOR)
            while len(keys) < len(cls._fields):
                # i.e. old token from before receipt_key
                keys.append("0")
            return cls(*keys)
        except Exception:
            raise SynapseError(400, "Invalid Token")

    def to_string(self):
        return self._SEPARATOR.join([str(k) for k in self])

    @property
    def room_stream_id(self):
        # TODO(markjh): Awful hack to work around hacks in the presence tests
        # which assume that the keys are integers.
        if type(self.room_key) is int:
            return self.room_key
        else:
            return int(self.room_key[1:].split("-")[-1])

    def is_after(self, other):
        """Does this token contain events that the other doesn't?"""
        return (
            (other.room_stream_id < self.room_stream_id)
            or (int(other.presence_key) < int(self.presence_key))
            or (int(other.typing_key) < int(self.typing_key))
            or (int(other.receipt_key) < int(self.receipt_key))
            or (int(other.account_data_key) < int(self.account_data_key))
            or (int(other.push_rules_key) < int(self.push_rules_key))
            or (int(other.to_device_key) < int(self.to_device_key))
            or (int(other.device_list_key) < int(self.device_list_key))
            or (int(other.groups_key) < int(self.groups_key))
        )

    def copy_and_advance(self, key, new_value):
        """Advance the given key in the token to a new value if and only if the
        new value is after the old value.
        """
        new_token = self.copy_and_replace(key, new_value)
        if key == "room_key":
            new_id = new_token.room_stream_id
            old_id = self.room_stream_id
        else:
            new_id = int(getattr(new_token, key))
            old_id = int(getattr(self, key))
        if old_id < new_id:
            return new_token
        else:
            return self

    def copy_and_replace(self, key, new_value):
        return self._replace(**{key: new_value})


StreamToken.START = StreamToken(
    *(["s0"] + ["0"] * (len(StreamToken._fields) - 1))
)


class RoomStreamToken(namedtuple("_StreamToken", "topological stream")):
    """Tokens are positions between events. The token "s1" comes after event 1.

            s0    s1
            |     |
        [0] V [1] V [2]

    Tokens can either be a point in the live event stream or a cursor going
    through historic events.

    When traversing the live event stream events are ordered by when they
    arrived at the homeserver.

    When traversing historic events the events are ordered by their depth in
    the event graph "topological_ordering" and then by when they arrived at the
    homeserver "stream_ordering".

    Live tokens start with an "s" followed by the "stream_ordering" id of the
    event it comes after. Historic tokens start with a "t" followed by the
    "topological_ordering" id of the event it comes after, followed by "-",
    followed by the "stream_ordering" id of the event it comes after.
    """
    __slots__ = []

    @classmethod
    def parse(cls, string):
        try:
            if string[0] == 's':
                return cls(topological=None, stream=int(string[1:]))
            if string[0] == 't':
                parts = string[1:].split('-', 1)
                return cls(topological=int(parts[0]), stream=int(parts[1]))
        except Exception:
            pass
        raise SynapseError(400, "Invalid token %r" % (string,))

    @classmethod
    def parse_stream_token(cls, string):
        try:
            if string[0] == 's':
                return cls(topological=None, stream=int(string[1:]))
        except Exception:
            pass
        raise SynapseError(400, "Invalid token %r" % (string,))

    def __str__(self):
        if self.topological is not None:
            return "t%d-%d" % (self.topological, self.stream)
        else:
            return "s%d" % (self.stream,)


class ThirdPartyInstanceID(
        namedtuple("ThirdPartyInstanceID", ("appservice_id", "network_id"))
):
    # Deny iteration because it will bite you if you try to create a singleton
    # set by:
    #    users = set(user)
    def __iter__(self):
        raise ValueError("Attempted to iterate a %s" % (type(self).__name__,))

    # Because this class is a namedtuple of strings, it is deeply immutable.
    def __copy__(self):
        return self

    def __deepcopy__(self, memo):
        return self

    @classmethod
    def from_string(cls, s):
        bits = s.split("|", 2)
        if len(bits) != 2:
            raise SynapseError(400, "Invalid ID %r" % (s,))

        return cls(appservice_id=bits[0], network_id=bits[1])

    def to_string(self):
        return "%s|%s" % (self.appservice_id, self.network_id,)

    __str__ = to_string

    @classmethod
    def create(cls, appservice_id, network_id,):
        return cls(appservice_id=appservice_id, network_id=network_id)