mirror of
https://github.com/matrix-construct/construct
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118 lines
3 KiB
JavaScript
118 lines
3 KiB
JavaScript
/*
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// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 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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*/
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'use strict';
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/**************************************
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* Power levels interface
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*
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* This is a category of functions that query the room's state
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* apropos room access control.
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*/
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room.power = {};
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/**
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* Query the room state for the power levels (and the room state
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* provides the proper default content so this is always well defined).
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*/
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room.power.levels = function()
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{
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return this.content['m.room.power_levels'][''];
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};
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/**
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* Get the power level required to issue an event of `type`
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* or the state_default for [anything we explicitly consider stat
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* because we can't see if a type has a state_key] or events_default
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* for any other type not specified.
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*
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* Also accepts the arbitrary transition labels for invite, kick, ban,
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* redact.
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*/
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room.power.event = function(type)
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{
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let levels = this.power.levels();
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switch(type)
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{
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case "invite": return levels.invite;
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case "redact": return levels.redact;
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case "kick": return levels.kick;
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case "ban": return levels.ban;
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default: break;
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}
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if(maybe(() => levels.events[type]) !== undefined)
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return levels.events[type];
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if((type in this.state))
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return levels.state_default;
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return levels.events_default;
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};
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/**
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* Get the power level of an mxid or the users_default if they
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* have no specified power level.
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*/
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room.power.user = function(mxid)
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{
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let levels = this.power.levels();
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let power = maybe(() => levels.users[mxid]);
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return power !== undefined? power : levels.users_default;
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};
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/**
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* Decisional boolean for whether a user has power to issue an event
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* of `type` (or `type` can be a specified arbitrary transition label)
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*/
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room.power.has = function(mxid, type)
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{
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return this.power.user(mxid) >= this.power.event(type);
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};
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/**
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* Determines the power level (this is vanity) for an 'operator' which
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* is someone who can issue at least one type of state event.
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*/
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room.power.op = function()
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{
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let levels = this.power.levels();
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let ret = levels.state_default;
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Object.each(levels.events, (type, level) =>
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{
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if((type in this.state))
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if(level < ret)
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ret = level;
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});
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return ret;
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};
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/**
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* Determines the power level (this is vanity) for 'voice' which
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* is someone who can issue any event -- so someone without voice
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* is read-only to the timeline except for their own membership event.
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*
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* Voice is not specific to m.room.message... should it be?
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*/
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room.power.voice = function()
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{
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let levels = this.power.levels();
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let ret = levels.events_default;
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Object.each(levels.events, (type, level) =>
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{
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if(level < ret)
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ret = level;
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});
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return ret;
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};
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