mirror of
https://github.com/matrix-construct/construct
synced 2024-09-12 03:29:15 +02:00
475 lines
9.5 KiB
JavaScript
475 lines
9.5 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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*******************************************************************************
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* State Function
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*
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* Dictionary of events considered "state events." The state provides context for the
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* event horizon of a timeline (the termination point at the start) to prevent the
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* need for querying indeterminately over the horizon.
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*
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* This class allows the timeline to be the single source of
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* authority for events in the room. So long as the timeline is
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* maintained in order, the state object will always provide
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* an accurate result as to the state of a room. This proxy
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* prevents any race between the timeline and the state object.
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*/
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room.state = class
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{
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constructor(timeline)
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{
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// The state function holds an internal reference to the timeline to make queries
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this.timeline = timeline;
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// The results of queries to the timeline are cached in the backing-object here.
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this.cache = Object.copy(room.state.defaults);
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// Cache timestamps (type => timestamp) is used to find out if the cache data is stale with
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// respect to when the timeline was last modified. This is partitioned by type even though
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// the timeline only has one TS value for now so all types are invalidated at the same time.
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this.ts = {};
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this.content = new room.state.content(this);
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}
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};
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room.state.prototype.set = function(state, type, val)
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{
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mc.abort({message: "illegal"});
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return false;
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};
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room.state.prototype.get = function(state, type)
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{
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if(this.valid(type))
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if((type in state))
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return state[type];
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let query = mc.event.is_type.bind(null, type);
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let idx = this.timeline.query(query);
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let event = this.timeline[idx[0]];
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if(!event || event.state_key === undefined)
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return state[type];
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this.update(type);
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return this._get_aggreg(state, type, idx);
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};
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room.state.prototype._get_aggreg = function(state, type, idx)
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{
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if(typeof(state[type]) != "object")
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state[type] = {};
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// Ensure true chronological order here so events that happen
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// after other events can simply overwrite them in this iteration.
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let present = this.timeline[0];
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idx.reverse().forEach((i) =>
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{
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let event = this.timeline[i];
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state[type][event.state_key] = event;
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});
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return state[type];
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};
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/** Determine if the state function has an up to date cache.
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*/
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room.state.prototype.valid = function(type)
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{
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let time = this.ts[type];
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return time && time >= this.timeline.modified;
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};
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/** Updates the cache timestamp for type
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*/
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room.state.prototype.update = function(type)
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{
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return this.ts[type] = mc.now();
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};
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/** Clears the cache for type
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*
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* After this, access to state will require new queries into the timeline.
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*/
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room.state.prototype.invalidate = function(type)
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{
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Object.clear(this.cache[type]);
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Object.defaults(this.cache[type], room.state.defaults[type]);
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this.ts[type] = 0;
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};
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/**
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**************************************
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*
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* State content tree
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*
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*/
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room.state.content = class
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{
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constructor(state, depth = 0)
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{
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this.state = state;
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}
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};
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room.state.content.prototype.set = function(state, key, val)
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{
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mc.abort({message: "unimplemented"});
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return false;
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};
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room.state.content.prototype.get = function(state, key)
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{
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let ret = {};
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for(let state_key in state[key])
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ret[state_key] = state[key][state_key].content;
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return ret;
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};
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Object.defineProperty(room.state, 'defaults', {
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writable: false,
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enumerable: false,
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configurable: false,
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value:
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{
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// 10.5.1: m.room.aliases - state_key'ed dictionary of aliases
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"m.room.aliases":
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{
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// "server_hostname": content.aliases
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},
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// 10.5.2: m.room.canonical_alias - main event
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"m.room.canonical_alias":
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{
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"":
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{
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content:
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{
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alias: undefined,
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},
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},
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},
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// 10.5.3: m.room.create - main event
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"m.room.create":
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{
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"":
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{
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content:
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{
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creator: undefined,
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},
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},
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},
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// 10.5.4: m.room.join_rules - main event
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"m.room.join_rules":
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{
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"":
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{
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content:
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{
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join_rule: undefined,
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},
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},
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},
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// 10.5.5: m.room.member - state_key'ed dictionary of members
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"m.room.member":
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{
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// "mxid": { membership: "join", displayname: "foo" },
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},
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// 10.5.6: m.room.power_levels - main event
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"m.room.power_levels":
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{
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"":
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{
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content:
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{
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// Defaults
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events_default: 0,
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state_default: 0,
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users_default: 0,
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// Actions (10.5.6: defaults to 50 if unspecified)
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ban: 50,
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invite: 50,
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kick: 50,
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redact: 50,
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// Access maps
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events: {}, // Power level required for event type; { "m.room.type": power }
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users: {}, // Power level available to user; { mxid: power }
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},
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},
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},
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// 11.2.1.3: m.room.name - main event
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"m.room.name":
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{
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"":
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{
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content:
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{
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name: undefined,
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},
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},
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},
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// 11.2.1.4: m.room.topic - main event
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"m.room.topic":
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{
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"":
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{
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content:
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{
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topic: undefined,
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},
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},
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},
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// 11.2.1.5: m.room.avatar - main event
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"m.room.avatar":
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{
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"":
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{
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content:
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{
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info: {},
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url: undefined,
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},
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},
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},
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// 11.9.1.1: m.room.history_visibility - main event
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"m.room.history_visibility":
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{
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"":
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{
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content:
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{
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history_visibility: "shared", // 11.9.3: defaults to 'shared'
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},
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},
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},
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// 11.13.1.1: m.room.guest_access - main event
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"m.room.guest_access":
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{
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"":
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{
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content:
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{
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guest_access: "forbidden",
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}
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},
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},
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}});
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/**
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* State -> Summary
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*
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* Digests a room's state into the format of the matrix rooms
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* directory (i.e. public state).
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*
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* Usage: room.state.summary(myroom.state)
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*
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* This is a static function, as the room's state object proxies the
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* timeline and state.public() will then query the timeline.
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*/
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room.state.summary = function(state)
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{
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let members = state['m.room.member'];
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let is_join = (mxid) => maybe(() => members[mxid].content.membership == "join");
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let aliases = [];
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Object.each(state['m.room.aliases'], (state_key, event) =>
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{
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aliases = aliases.concat(event.content.aliases);
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});
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return {
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room_id: state['m.room.create'][''].room_id,
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name: state['m.room.name'][''].content.name,
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topic: state['m.room.topic'][''].content.topic,
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canonical_alias: state['m.room.canonical_alias'][''].content.alias,
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world_readable: state['m.room.history_visibility'][''].content.history_visibility == "world_readable",
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guest_can_join: state['m.room.guest_access'][''].content.guest_access == "can_join",
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num_joined_members: Array.count(Object.keys(members), is_join),
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aliases: aliases,
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};
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};
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/** Summary -> State (events)
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*
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* Translate summary data into an array of events. The events will not
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* have authentic data other than the essential content but we specify
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* an origin_server_ts of 0 indicating they should be replaced by any
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* timeline algorithm.
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*/
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room.state.summary.parse = function(summary)
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{
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let events = [];
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Object.each(summary, (key, val) =>
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{
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let handler = room.state.summary.parse.on[key];
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if(typeof(handler) == "function") try
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{
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let ret = handler(val);
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if(typeof(ret) != "object")
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return;
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if(Array.isArray(ret))
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events = events.concat(ret);
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else
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events.push(ret);
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}
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catch(error)
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{
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console.error("Room summary parse error: key[" + key + "] " + error);
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}
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else
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{
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console.warn("Unhandled room summary key [" + key + "]");
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}
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});
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return events;
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};
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// Collection of handlers.
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room.state.summary.parse.on = {};
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// 'opts' is not part of the matrix room summary;
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// this stub prevents a console warning for it being unhandled.
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room.state.summary.parse.on["opts"] = function()
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{
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return;
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};
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room.state.summary.parse.on["room_id"] = function(room_id)
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{
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return;
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};
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room.state.summary.parse.on["name"] = function(name)
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{
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return {
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type: "m.room.name",
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origin_server_ts: 0,
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state_key: "",
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content:
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{
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name: name,
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},
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};
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};
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room.state.summary.parse.on["topic"] = function(topic)
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{
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return {
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type: "m.room.topic",
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origin_server_ts: 0,
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state_key: "",
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content:
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{
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topic: topic,
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}
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};
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};
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room.state.summary.parse.on["canonical_alias"] = function(canonical_alias)
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{
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return {
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type: "m.room.canonical_alias",
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origin_server_ts: 0,
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state_key: "",
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content:
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{
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alias: canonical_alias,
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}
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};
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};
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room.state.summary.parse.on["aliases"] = function(aliases)
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{
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let contents = {};
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aliases.forEach((alias) =>
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{
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let [local, domain] = alias.split(":");
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if(!(domain in contents))
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contents[domain] = [];
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contents[domain].push(alias);
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});
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let events = [];
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Object.each(contents, (domain, aliases) =>
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{
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events.push(
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{
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type: "m.room.aliases",
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origin_server_ts: 0,
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state_key: domain,
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content:
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{
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aliases: aliases,
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},
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})
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});
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return events;
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};
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room.state.summary.parse.on["guest_can_join"] = function(bool)
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{
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return {
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type: "m.room.guest_access",
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origin_server_ts: 0,
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state_key: "",
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content:
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{
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guest_access: bool? "can_join" : "forbidden",
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},
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};
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};
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room.state.summary.parse.on["world_readable"] = function(bool)
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{
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return {
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type: "m.room.history_visibility",
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origin_server_ts: 0,
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state_key: "",
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content:
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{
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history_visibility: bool? "world_readable" : undefined,
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},
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};
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};
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room.state.summary.parse.on["num_joined_members"] = function(num_joined_members)
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{
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// TODO: XXX
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return
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};
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/* TODO: XXX
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room.state.summary.parse.on["avatar_url"] = function(avatar_url)
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{
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};
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*/
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