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.. Copyright 2018 New Vector Ltd.
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..
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.. Licensed under the Apache License, Version 2.0 (the "License");
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.. you may not use this file except in compliance with the License.
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.. You may obtain a copy of the License at
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..
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.. http://www.apache.org/licenses/LICENSE-2.0
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..
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.. Unless required by applicable law or agreed to in writing, software
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.. distributed under the License is distributed on an "AS IS" BASIS,
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.. WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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.. See the License for the specific language governing permissions and
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.. limitations under the License.
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User, room, and group mentions
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==============================
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.. _module:mentions:
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This module allows users to mention other users, rooms, and groups within
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a room message. This is achieved by including a `matrix.to URI`_ in the HTML
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body of an `m.room.message`_ event. This module does not have any server-specific
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behaviour to it.
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Mentions apply only to `m.room.message`_ events where the ``msgtype`` is ``m.text``,
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``m.emote``, or ``m.notice``. The ``format`` for the event must be ``org.matrix.custom.html``
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and therefore requires a ``formatted_body``.
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To make a mention, reference the entity being mentioned in the ``formatted_body``
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using an anchor, like so::
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{
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"body": "Hello Alice!",
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"msgtype": "m.text",
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"format": "org.matrix.custom.html",
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"formatted_body": "Hello <a href='https://matrix.to/#/@alice:example.org'>Alice</a>!"
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}
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Client behaviour
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----------------
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In addition to using the appropriate ``matrix.to URI`` for the mention,
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clients should use the following guidelines when making mentions in events
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to be sent:
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* When mentioning users, use the user's potentially ambigious display name for
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the anchor's text. If the user does not have a display name, use the user's
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ID.
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* When mentioning rooms, use the canonical alias for the room. If the room
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does not have a canonical alias, prefer one of the aliases listed on the
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room. If no alias can be found, fall back to the room ID. In all cases,
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use the alias/room ID being linked to as the anchor's text.
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* When referencing groups, use the group ID as the anchor's text.
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The text component of the anchor should be used in the event's ``body`` where
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the mention would normally be represented, as shown in the example above.
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Clients should display mentions differently from other elements. For example,
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this may be done by changing the background color of the mention to indicate
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that it is different from a normal link.
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If the current user is mentioned in a message (either by a mention as defined
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in this module or by a push rule), the client should show that mention differently
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from other mentions, such as by using a red background color to signify to the
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user that they were mentioned.
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When clicked, the mention should navigate the user to the appropriate room, group,
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or user information.
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.. _`matrix.to URI`: ../appendices.html#matrix-to-navigation
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