101 lines
3.2 KiB
C++
101 lines
3.2 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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ircd::string_view
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ircd::m::display_name(const mutable_buffer &out,
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const room &room)
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{
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const room::state state
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{
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room
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};
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// 1. If the room has an m.room.name state event with a non-empty name
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// field, use the name given by that field.
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string_view ret;
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{
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const event::idx event_idx
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{
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state.get(std::nothrow, "m.room.name", "")
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};
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m::get(std::nothrow, event_idx, "content", [&out, &ret]
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(const json::object &content)
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{
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const json::string &name
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{
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content.get("name")
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};
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ret = strlcpy
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{
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out, name
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};
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});
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}
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// 2. If the room has an m.room.canonical_alias state event with a
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// non-empty alias field, use the alias given by that field as the name.
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if(!ret)
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{
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const event::idx event_idx
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{
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state.get(std::nothrow, "m.room.canonical_alias", "")
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};
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m::get(std::nothrow, event_idx, "content", [&out, &ret]
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(const json::object &content)
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{
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const json::string &alias
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{
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content.get("alias")
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};
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ret = strlcpy
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{
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out, alias
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};
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});
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}
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// 3. If neither of the above conditions are met, the client can optionally
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// guess an alias from the m.room.alias events in the room. This is a
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// temporary measure while clients do not promote canonical aliases as
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// prominently. This step may be removed in a future version of the
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// specification.
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// 4. If none of the above conditions are met, a name should be composed
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// based on the members of the room. Clients should consider m.room.member
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// events for users other than the logged-in user, as defined below.
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// i. If the number of m.heroes for the room are greater or equal to
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// m.joined_member_count + m.invited_member_count - 1, then use the
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// membership events for the heroes to calculate display names for the
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// users (disambiguating them if required) and concatenating them. For
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// example, the client may choose to show "Alice, Bob, and Charlie
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// (@charlie:example.org)" as the room name. The client may optionally
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// limit the number of users it uses to generate a room name.
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// ii. If there are fewer heroes than m.joined_member_count +
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// m.invited_member_count - 1, and m.joined_member_count +
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// m.invited_member_count is greater than 1, the client should use the
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// heroes to calculate display names for the users (disambiguating them if
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// required) and concatenating them alongside a count of the remaining
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// users. For example, "Alice, Bob, and 1234 others".
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// iii. If m.joined_member_count + m.invited_member_count is less than or
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// equal to 1 (indicating the member is alone), the client should use the
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// rules above to indicate that the room was empty. For example, "Empty Room
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// (was Alice)", "Empty Room (was Alice and 1234 others)", or "Empty Room"
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// if there are no heroes.
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return ret;
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}
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