summary refs log tree commit diff
path: root/docs/admin_api/user_admin_api.rst
blob: 8d4ec5a6f913379654c9ece2d81347859369d420 (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
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
.. contents::

Query User Account
==================

This API returns information about a specific user account.

The api is::

    GET /_synapse/admin/v2/users/<user_id>

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

It returns a JSON body like the following:

.. code:: json

    {
        "displayname": "User",
        "threepids": [
            {
                "medium": "email",
                "address": "<user_mail_1>"
            },
            {
                "medium": "email",
                "address": "<user_mail_2>"
            }
        ],
        "avatar_url": "<avatar_url>",
        "admin": 0,
        "deactivated": 0,
        "shadow_banned": 0,
        "password_hash": "$2b$12$p9B4GkqYdRTPGD",
        "creation_ts": 1560432506,
        "appservice_id": null,
        "consent_server_notice_sent": null,
        "consent_version": null
    }

URL parameters:

- ``user_id``: fully-qualified user id: for example, ``@user:server.com``.

Create or modify Account
========================

This API allows an administrator to create or modify a user account with a
specific ``user_id``.

This api is::

    PUT /_synapse/admin/v2/users/<user_id>

with a body of:

.. code:: json

    {
        "password": "user_password",
        "displayname": "User",
        "threepids": [
            {
                "medium": "email",
                "address": "<user_mail_1>"
            },
            {
                "medium": "email",
                "address": "<user_mail_2>"
            }
        ],
        "avatar_url": "<avatar_url>",
        "admin": false,
        "deactivated": false
    }

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

URL parameters:

- ``user_id``: fully-qualified user id: for example, ``@user:server.com``.

Body parameters:

- ``password``, optional. If provided, the user's password is updated and all
  devices are logged out.

- ``displayname``, optional, defaults to the value of ``user_id``.

- ``threepids``, optional, allows setting the third-party IDs (email, msisdn)
  belonging to a user.

- ``avatar_url``, optional, must be a
  `MXC URI <https://matrix.org/docs/spec/client_server/r0.6.0#matrix-content-mxc-uris>`_.

- ``admin``, optional, defaults to ``false``.

- ``deactivated``, optional. If unspecified, deactivation state will be left
  unchanged on existing accounts and set to ``false`` for new accounts.
  A user cannot be erased by deactivating with this API. For details on deactivating users see
  `Deactivate Account <#deactivate-account>`_.

If the user already exists then optional parameters default to the current value.

In order to re-activate an account ``deactivated`` must be set to ``false``. If
users do not login via single-sign-on, a new ``password`` must be provided.

List Accounts
=============

This API returns all local user accounts.

The api is::

    GET /_synapse/admin/v2/users?from=0&limit=10&guests=false

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

The parameter ``from`` is optional but used for pagination, denoting the
offset in the returned results. This should be treated as an opaque value and
not explicitly set to anything other than the return value of ``next_token``
from a previous call.

The parameter ``limit`` is optional but is used for pagination, denoting the
maximum number of items to return in this call. Defaults to ``100``.

The parameter ``user_id`` is optional and filters to only return users with user IDs
that contain this value. This parameter is ignored when using the ``name`` parameter.

The parameter ``name`` is optional and filters to only return users with user ID localparts
**or** displaynames that contain this value.

The parameter ``guests`` is optional and if ``false`` will **exclude** guest users.
Defaults to ``true`` to include guest users.

The parameter ``deactivated`` is optional and if ``true`` will **include** deactivated users.
Defaults to ``false`` to exclude deactivated users.

A JSON body is returned with the following shape:

.. code:: json

    {
        "users": [
            {
                "name": "<user_id1>",
                "is_guest": 0,
                "admin": 0,
                "user_type": null,
                "deactivated": 0,
                "shadow_banned": 0,
                "displayname": "<User One>",
                "avatar_url": null
            }, {
                "name": "<user_id2>",
                "is_guest": 0,
                "admin": 1,
                "user_type": null,
                "deactivated": 0,
                "shadow_banned": 0,
                "displayname": "<User Two>",
                "avatar_url": "<avatar_url>"
            }
        ],
        "next_token": "100",
        "total": 200
    }

To paginate, check for ``next_token`` and if present, call the endpoint again
with ``from`` set to the value of ``next_token``. This will return a new page.

If the endpoint does not return a ``next_token`` then there are no more users
to paginate through.

Query current sessions for a user
=================================

This API returns information about the active sessions for a specific user.

The api is::

    GET /_synapse/admin/v1/whois/<user_id>

and::

    GET /_matrix/client/r0/admin/whois/<userId>

See also: `Client Server API Whois
<https://matrix.org/docs/spec/client_server/r0.6.1#get-matrix-client-r0-admin-whois-userid>`_

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

It returns a JSON body like the following:

.. code:: json

    {
        "user_id": "<user_id>",
        "devices": {
            "": {
                "sessions": [
                    {
                        "connections": [
                            {
                                "ip": "1.2.3.4",
                                "last_seen": 1417222374433,
                                "user_agent": "Mozilla/5.0 ..."
                            },
                            {
                                "ip": "1.2.3.10",
                                "last_seen": 1417222374500,
                                "user_agent": "Dalvik/2.1.0 ..."
                            }
                        ]
                    }
                ]
            }
        }
    }

``last_seen`` is measured in milliseconds since the Unix epoch.

Deactivate Account
==================

This API deactivates an account. It removes active access tokens, resets the
password, and deletes third-party IDs (to prevent the user requesting a
password reset).

It can also mark the user as GDPR-erased. This means messages sent by the
user will still be visible by anyone that was in the room when these messages
were sent, but hidden from users joining the room afterwards.

The api is::

    POST /_synapse/admin/v1/deactivate/<user_id>

with a body of:

.. code:: json

    {
        "erase": true
    }

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

The erase parameter is optional and defaults to ``false``.
An empty body may be passed for backwards compatibility.

The following actions are performed when deactivating an user:

- Try to unpind 3PIDs from the identity server
- Remove all 3PIDs from the homeserver
- Delete all devices and E2EE keys
- Delete all access tokens
- Delete the password hash
- Removal from all rooms the user is a member of
- Remove the user from the user directory
- Reject all pending invites
- Remove all account validity information related to the user

The following additional actions are performed during deactivation if ``erase``
is set to ``true``:

- Remove the user's display name
- Remove the user's avatar URL
- Mark the user as erased


Reset password
==============

Changes the password of another user. This will automatically log the user out of all their devices.

The api is::

    POST /_synapse/admin/v1/reset_password/<user_id>

with a body of:

.. code:: json

   {
       "new_password": "<secret>",
       "logout_devices": true
   }

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

The parameter ``new_password`` is required.
The parameter ``logout_devices`` is optional and defaults to ``true``.

Get whether a user is a server administrator or not
===================================================


The api is::

    GET /_synapse/admin/v1/users/<user_id>/admin

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

A response body like the following is returned:

.. code:: json

    {
        "admin": true
    }


Change whether a user is a server administrator or not
======================================================

Note that you cannot demote yourself.

The api is::

    PUT /_synapse/admin/v1/users/<user_id>/admin

with a body of:

.. code:: json

    {
        "admin": true
    }

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.


List room memberships of an user
================================
Gets a list of all ``room_id`` that a specific ``user_id`` is member.

The API is::

  GET /_synapse/admin/v1/users/<user_id>/joined_rooms

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

A response body like the following is returned:

.. code:: json

    {
        "joined_rooms": [
            "!DuGcnbhHGaSZQoNQR:matrix.org",
            "!ZtSaPCawyWtxfWiIy:matrix.org"
        ],
        "total": 2
    }

The server returns the list of rooms of which the user and the server
are member. If the user is local, all the rooms of which the user is
member are returned.

**Parameters**

The following parameters should be set in the URL:

- ``user_id`` - fully qualified: for example, ``@user:server.com``.

**Response**

The following fields are returned in the JSON response body:

- ``joined_rooms`` - An array of ``room_id``.
- ``total`` - Number of rooms.


List media of a user
====================
Gets a list of all local media that a specific ``user_id`` has created.
By default, the response is ordered by descending creation date and ascending media ID.
The newest media is on top. You can change the order with parameters
``order_by`` and ``dir``.

The API is::

  GET /_synapse/admin/v1/users/<user_id>/media

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

A response body like the following is returned:

.. code:: json

    {
      "media": [
        {
          "created_ts": 100400,
          "last_access_ts": null,
          "media_id": "qXhyRzulkwLsNHTbpHreuEgo",
          "media_length": 67,
          "media_type": "image/png",
          "quarantined_by": null,
          "safe_from_quarantine": false,
          "upload_name": "test1.png"
        },
        {
          "created_ts": 200400,
          "last_access_ts": null,
          "media_id": "FHfiSnzoINDatrXHQIXBtahw",
          "media_length": 67,
          "media_type": "image/png",
          "quarantined_by": null,
          "safe_from_quarantine": false,
          "upload_name": "test2.png"
        }
      ],
      "next_token": 3,
      "total": 2
    }

To paginate, check for ``next_token`` and if present, call the endpoint again
with ``from`` set to the value of ``next_token``. This will return a new page.

If the endpoint does not return a ``next_token`` then there are no more
reports to paginate through.

**Parameters**

The following parameters should be set in the URL:

- ``user_id`` - string - fully qualified: for example, ``@user:server.com``.
- ``limit``: string representing a positive integer - Is optional but is used for pagination,
  denoting the maximum number of items to return in this call. Defaults to ``100``.
- ``from``: string representing a positive integer - Is optional but used for pagination,
  denoting the offset in the returned results. This should be treated as an opaque value and
  not explicitly set to anything other than the return value of ``next_token`` from a previous call.
  Defaults to ``0``.
- ``order_by`` - The method by which to sort the returned list of media.
  If the ordered field has duplicates, the second order is always by ascending ``media_id``,
  which guarantees a stable ordering. Valid values are:

  - ``media_id`` - Media are ordered alphabetically by ``media_id``.
  - ``upload_name`` - Media are ordered alphabetically by name the media was uploaded with.
  - ``created_ts`` - Media are ordered by when the content was uploaded in ms.
    Smallest to largest. This is the default.
  - ``last_access_ts`` - Media are ordered by when the content was last accessed in ms.
    Smallest to largest.
  - ``media_length`` - Media are ordered by length of the media in bytes.
    Smallest to largest.
  - ``media_type`` - Media are ordered alphabetically by MIME-type.
  - ``quarantined_by`` - Media are ordered alphabetically by the user ID that
    initiated the quarantine request for this media.
  - ``safe_from_quarantine`` - Media are ordered by the status if this media is safe
    from quarantining.

- ``dir`` - Direction of media order. Either ``f`` for forwards or ``b`` for backwards.
  Setting this value to ``b`` will reverse the above sort order. Defaults to ``f``.

If neither ``order_by`` nor ``dir`` is set, the default order is newest media on top
(corresponds to ``order_by`` = ``created_ts`` and ``dir`` = ``b``).

Caution. The database only has indexes on the columns ``media_id``,
``user_id`` and ``created_ts``. This means that if a different sort order is used
(``upload_name``, ``last_access_ts``, ``media_length``, ``media_type``,
``quarantined_by`` or ``safe_from_quarantine``), this can cause a large load on the
database, especially for large environments.

**Response**

The following fields are returned in the JSON response body:

- ``media`` - An array of objects, each containing information about a media.
  Media objects contain the following fields:

  - ``created_ts`` - integer - Timestamp when the content was uploaded in ms.
  - ``last_access_ts`` - integer - Timestamp when the content was last accessed in ms.
  - ``media_id`` - string - The id used to refer to the media.
  - ``media_length`` - integer - Length of the media in bytes.
  - ``media_type`` - string - The MIME-type of the media.
  - ``quarantined_by`` - string - The user ID that initiated the quarantine request
    for this media.

  - ``safe_from_quarantine`` - bool - Status if this media is safe from quarantining.
  - ``upload_name`` - string - The name the media was uploaded with.

- ``next_token``: integer - Indication for pagination. See above.
- ``total`` - integer - Total number of media.

Login as a user
===============

Get an access token that can be used to authenticate as that user. Useful for
when admins wish to do actions on behalf of a user.

The API is::

    POST /_synapse/admin/v1/users/<user_id>/login
    {}

An optional ``valid_until_ms`` field can be specified in the request body as an
integer timestamp that specifies when the token should expire. By default tokens
do not expire.

A response body like the following is returned:

.. code:: json

    {
        "access_token": "<opaque_access_token_string>"
    }


This API does *not* generate a new device for the user, and so will not appear
their ``/devices`` list, and in general the target user should not be able to
tell they have been logged in as.

To expire the token call the standard ``/logout`` API with the token.

Note: The token will expire if the *admin* user calls ``/logout/all`` from any
of their devices, but the token will *not* expire if the target user does the
same.


User devices
============

List all devices
----------------
Gets information about all devices for a specific ``user_id``.

The API is::

  GET /_synapse/admin/v2/users/<user_id>/devices

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

A response body like the following is returned:

.. code:: json

    {
      "devices": [
        {
          "device_id": "QBUAZIFURK",
          "display_name": "android",
          "last_seen_ip": "1.2.3.4",
          "last_seen_ts": 1474491775024,
          "user_id": "<user_id>"
        },
        {
          "device_id": "AUIECTSRND",
          "display_name": "ios",
          "last_seen_ip": "1.2.3.5",
          "last_seen_ts": 1474491775025,
          "user_id": "<user_id>"
        }
      ],
      "total": 2
    }

**Parameters**

The following parameters should be set in the URL:

- ``user_id`` - fully qualified: for example, ``@user:server.com``.

**Response**

The following fields are returned in the JSON response body:

- ``devices`` - An array of objects, each containing information about a device.
  Device objects contain the following fields:

  - ``device_id`` - Identifier of device.
  - ``display_name`` - Display name set by the user for this device.
    Absent if no name has been set.
  - ``last_seen_ip`` - The IP address where this device was last seen.
    (May be a few minutes out of date, for efficiency reasons).
  - ``last_seen_ts`` - The timestamp (in milliseconds since the unix epoch) when this
    devices was last seen. (May be a few minutes out of date, for efficiency reasons).
  - ``user_id`` - Owner of  device.

- ``total`` - Total number of user's devices.

Delete multiple devices
------------------
Deletes the given devices for a specific ``user_id``, and invalidates
any access token associated with them.

The API is::

    POST /_synapse/admin/v2/users/<user_id>/delete_devices

    {
      "devices": [
        "QBUAZIFURK",
        "AUIECTSRND"
      ],
    }

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

An empty JSON dict is returned.

**Parameters**

The following parameters should be set in the URL:

- ``user_id`` - fully qualified: for example, ``@user:server.com``.

The following fields are required in the JSON request body:

- ``devices`` - The list of device IDs to delete.

Show a device
---------------
Gets information on a single device, by ``device_id`` for a specific ``user_id``.

The API is::

    GET /_synapse/admin/v2/users/<user_id>/devices/<device_id>

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

A response body like the following is returned:

.. code:: json

    {
      "device_id": "<device_id>",
      "display_name": "android",
      "last_seen_ip": "1.2.3.4",
      "last_seen_ts": 1474491775024,
      "user_id": "<user_id>"
    }

**Parameters**

The following parameters should be set in the URL:

- ``user_id`` - fully qualified: for example, ``@user:server.com``.
- ``device_id`` - The device to retrieve.

**Response**

The following fields are returned in the JSON response body:

- ``device_id`` - Identifier of device.
- ``display_name`` - Display name set by the user for this device.
  Absent if no name has been set.
- ``last_seen_ip`` - The IP address where this device was last seen.
  (May be a few minutes out of date, for efficiency reasons).
- ``last_seen_ts`` - The timestamp (in milliseconds since the unix epoch) when this
  devices was last seen. (May be a few minutes out of date, for efficiency reasons).
- ``user_id`` - Owner of  device.

Update a device
---------------
Updates the metadata on the given ``device_id`` for a specific ``user_id``.

The API is::

    PUT /_synapse/admin/v2/users/<user_id>/devices/<device_id>

    {
      "display_name": "My other phone"
    }

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

An empty JSON dict is returned.

**Parameters**

The following parameters should be set in the URL:

- ``user_id`` - fully qualified: for example, ``@user:server.com``.
- ``device_id`` - The device to update.

The following fields are required in the JSON request body:

- ``display_name`` - The new display name for this device. If not given,
  the display name is unchanged.

Delete a device
---------------
Deletes the given ``device_id`` for a specific ``user_id``,
and invalidates any access token associated with it.

The API is::

    DELETE /_synapse/admin/v2/users/<user_id>/devices/<device_id>

    {}

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

An empty JSON dict is returned.

**Parameters**

The following parameters should be set in the URL:

- ``user_id`` - fully qualified: for example, ``@user:server.com``.
- ``device_id`` - The device to delete.

List all pushers
================
Gets information about all pushers for a specific ``user_id``.

The API is::

  GET /_synapse/admin/v1/users/<user_id>/pushers

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

A response body like the following is returned:

.. code:: json

    {
      "pushers": [
        {
          "app_display_name":"HTTP Push Notifications",
          "app_id":"m.http",
          "data": {
            "url":"example.com"
          },
          "device_display_name":"pushy push",
          "kind":"http",
          "lang":"None",
          "profile_tag":"",
          "pushkey":"a@example.com"
        }
      ],
      "total": 1
    }

**Parameters**

The following parameters should be set in the URL:

- ``user_id`` - fully qualified: for example, ``@user:server.com``.

**Response**

The following fields are returned in the JSON response body:

- ``pushers`` - An array containing the current pushers for the user

  - ``app_display_name`` - string - A string that will allow the user to identify
    what application owns this pusher.

  - ``app_id`` - string - This is a reverse-DNS style identifier for the application.
    Max length, 64 chars.

  - ``data`` - A dictionary of information for the pusher implementation itself.

    - ``url`` - string - Required if ``kind`` is ``http``. The URL to use to send
      notifications to.

    - ``format`` - string - The format to use when sending notifications to the
      Push Gateway.

  - ``device_display_name`` - string -  A string that will allow the user to identify
    what device owns this pusher.

  - ``profile_tag`` - string - This string determines which set of device specific rules
    this pusher executes.

  - ``kind`` - string -  The kind of pusher. "http" is a pusher that sends HTTP pokes.
  - ``lang`` - string - The preferred language for receiving notifications
    (e.g. 'en' or 'en-US')

  - ``profile_tag`` - string - This string determines which set of device specific rules
    this pusher executes.

  - ``pushkey`` - string - This is a unique identifier for this pusher.
    Max length, 512 bytes.

- ``total`` - integer - Number of pushers.

See also `Client-Server API Spec <https://matrix.org/docs/spec/client_server/latest#get-matrix-client-r0-pushers>`_

Shadow-banning users
====================

Shadow-banning is a useful tool for moderating malicious or egregiously abusive users.
A shadow-banned users receives successful responses to their client-server API requests,
but the events are not propagated into rooms. This can be an effective tool as it
(hopefully) takes longer for the user to realise they are being moderated before
pivoting to another account.

Shadow-banning a user should be used as a tool of last resort and may lead to confusing
or broken behaviour for the client. A shadow-banned user will not receive any
notification and it is generally more appropriate to ban or kick abusive users.
A shadow-banned user will be unable to contact anyone on the server.

The API is::

  POST /_synapse/admin/v1/users/<user_id>/shadow_ban

To use it, you will need to authenticate by providing an ``access_token`` for a
server admin: see `README.rst <README.rst>`_.

An empty JSON dict is returned.

**Parameters**

The following parameters should be set in the URL:

- ``user_id`` - The fully qualified MXID: for example, ``@user:server.com``. The user must
  be local.