vector-im-hydrogen-web/src/matrix/room/Invite.js

/*
Copyright 2021 The Matrix.org Foundation C.I.C.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import {EventEmitter} from "../../utils/EventEmitter.js";
import {SummaryData, processStateEvent} from "./RoomSummary.js";
import {Heroes} from "./members/Heroes.js";
import {MemberChange, RoomMember, EVENT_TYPE as MEMBER_EVENT_TYPE} from "./members/RoomMember.js";

export class Invite extends EventEmitter {
    constructor({roomId, user, hsApi, emitCollectionRemove, clock}) {
        super();
        this._roomId = roomId;
        this._user = user;
        this._hsApi = hsApi;
        this._emitCollectionRemove = emitCollectionRemove;
        this._clock = clock;
        this._inviteData = null;
    }

    get id() {
        return this._roomId;
    }

    get name() {
        return this._inviteData.name || this._inviteData.canonicalAlias;
    }

    get isDirectMessage() {
        return this._inviteData.isDirectMessage;
    }

    get avatarUrl() {
        return this._inviteData.avatarUrl;
    }

    get timestamp() {
        return this._inviteData.timestamp;
    }

    get isEncrypted() {
        return this._inviteData.isEncrypted;
    }

    get inviter() {
        return this._inviter;
    }

    get joinRule() {
        return this._inviteData.joinRule;
    }

    async accept() {

    }

    async reject() {

    }

    load(inviteData, log) {
        log.set("id", this.id);
        this._inviteData = inviteData;
        this._inviter = inviteData.inviter ? new RoomMember(inviteData.inviter) : null;
    }

    async writeSync(membership, roomResponse, txn, log) {
        if (membership === "invite") {
            log.set("id", this.id);
            log.set("add", true);
            const inviteState = roomResponse["invite_state"]?.events;
            if (!Array.isArray(inviteState)) {
                return null;
            }
            const summaryData = this._createSummaryData(inviteState);
            let heroes;
            if (!summaryData.name && !summaryData.canonicalAlias) {
                heroes = await this._createHeroes(inviteState);
            }
            const myInvite = this._getMyInvite(inviteState);
            if (!myInvite) {
                return null;
            }
            const inviter = this._getInviter(myInvite, inviteState);
            const inviteData = this._createData(inviteState, myInvite, inviter, summaryData, heroes);
            txn.invites.set(inviteData);
            return {inviteData, inviter};
        } else {
            log.set("id", this.id);
            log.set("membership", membership);
            txn.invites.remove(this.id);
            return null;
        }
    }

    afterSync(changes) {
        if (changes) {
            this._inviteData = changes.inviteData;
            this._inviter = changes.inviter;
            // emit update/add
        } else {
            this._emitCollectionRemove(this);
            this.emit("change");
        }
    }

    _createData(inviteState, myInvite, inviter, summaryData, heroes) {
        const name = heroes ? heroes.roomName : summaryData.name;
        const avatarUrl = heroes ? heroes.roomAvatarUrl : summaryData.avatarUrl;
        return {
            roomId: this.id,
            isEncrypted: !!summaryData.encryption,
            isDirectMessage: this._isDirectMessage(myInvite),
//            type: 
            name,
            avatarUrl,
            canonicalAlias: summaryData.canonicalAlias,
            timestamp: this._clock.now(),
            joinRule: this._getJoinRule(inviteState),
            inviter: inviter?.serialize(),
        };
    }

    _isDirectMessage(myInvite) {
        return !!(myInvite?.content?.is_direct);
    }

    _createSummaryData(inviteState) {
        return inviteState.reduce(processStateEvent, new SummaryData(null, this.id));
    }

    async _createHeroes(inviteState) {
        const members = inviteState.filter(e => e.type === MEMBER_EVENT_TYPE);
        const otherMembers = members.filter(e => e.state_key !== this._user.id);
        const memberChanges = otherMembers.reduce((map, e) => {
            const member = RoomMember.fromMemberEvent(this.id, e);
            map.set(member.userId, new MemberChange(member, null));
            return map;
        }, new Map());
        const otherUserIds = otherMembers.map(e => e.state_key);
        const heroes = new Heroes(this.id);
        const changes = await heroes.calculateChanges(otherUserIds, memberChanges, null);
        // we don't get an actual lazy-loading m.heroes summary on invites,
        // so just count the members by hand
        const countSummary = new SummaryData(null, this.id);
        countSummary.joinCount = members.reduce((sum, e) => sum + (e.content?.membership === "join" ? 1 : 0), 0);
        countSummary.inviteCount = members.reduce((sum, e) => sum + (e.content?.membership === "invite" ? 1 : 0), 0);
        heroes.applyChanges(changes, countSummary);
        return heroes;
    }

    _getMyInvite(inviteState) {
        return inviteState.find(e => e.type === MEMBER_EVENT_TYPE && e.state_key === this._user.id);
    }

    _getInviter(myInvite, inviteState) {
        const inviterMemberEvent = inviteState.find(e => e.type === MEMBER_EVENT_TYPE && e.state_key === myInvite.sender);
        if (inviterMemberEvent) {
            return RoomMember.fromMemberEvent(this.id, inviterMemberEvent);
        }
    }

    _getJoinRule(inviteState) {
        const event = inviteState.find(e => e.type === "m.room.join_rules");
        if (event) {
            return event.content?.join_rule;
        }
        return null;
    }
}

import {NullLogItem} from "../../logging/NullLogger.js";
import {Clock as MockClock} from "../../mocks/Clock.js";
import {default as roomInviteFixture} from "../../fixtures/matrix/invites/room.js";
import {default as dmInviteFixture} from "../../fixtures/matrix/invites/dm.js";

export function tests() {

    function createStorage() {
        const invitesMap = new Map();
        return {
            invitesMap,
            invites: {
                set(invite) {
                    invitesMap.set(invite.roomId, invite);
                },
                remove(roomId) {
                    invitesMap.delete(roomId);
                }
            }
        }
    }

    const roomId = "!123:hs.tld";
    const aliceAvatarUrl = "mxc://hs.tld/def456";
    const roomAvatarUrl = "mxc://hs.tld/roomavatar";

    return {
        "invite for room has correct fields": async assert => {
            const invite = new Invite({
                roomId,
                clock: new MockClock(1001),
                user: {id: "@bob:hs.tld"}
            });
            const txn = createStorage();
            const changes = await invite.writeSync("invite", roomInviteFixture, txn, new NullLogItem());
            assert.equal(txn.invitesMap.get(roomId).roomId, roomId);
            invite.afterSync(changes);
            assert.equal(invite.name, "Invite example");
            assert.equal(invite.avatarUrl, roomAvatarUrl);
            assert.equal(invite.joinRule, "invite");
            assert.equal(invite.timestamp, 1001);
            assert.equal(invite.isEncrypted, false);
            assert.equal(invite.isDirectMessage, false);
            assert(invite.inviter);
            assert.equal(invite.inviter.userId, "@alice:hs.tld");
            assert.equal(invite.inviter.displayName, "Alice");
            assert.equal(invite.inviter.avatarUrl, aliceAvatarUrl);
        },
        "invite for encrypted DM has correct fields": async assert => {
            const invite = new Invite({
                roomId,
                clock: new MockClock(1003),
                user: {id: "@bob:hs.tld"}
            });
            const txn = createStorage();
            const changes = await invite.writeSync("invite", dmInviteFixture, txn, new NullLogItem());
            assert.equal(txn.invitesMap.get(roomId).roomId, roomId);
            invite.afterSync(changes);
            assert.equal(invite.name, "Alice");
            assert.equal(invite.avatarUrl, aliceAvatarUrl);
            assert.equal(invite.timestamp, 1003);
            assert.equal(invite.isEncrypted, true);
            assert.equal(invite.isDirectMessage, true);
            assert(invite.inviter);
            assert.equal(invite.inviter.userId, "@alice:hs.tld");
            assert.equal(invite.inviter.displayName, "Alice");
            assert.equal(invite.inviter.avatarUrl, aliceAvatarUrl);
        },
        "load persisted invite has correct fields": async assert => {
            const writeInvite = new Invite({
                roomId,
                clock: new MockClock(1003),
                user: {id: "@bob:hs.tld"}
            });
            const txn = createStorage();
            await writeInvite.writeSync("invite", dmInviteFixture, txn, new NullLogItem());
            const invite = new Invite({roomId});
            invite.load(txn.invitesMap.get(roomId), new NullLogItem());
            assert.equal(invite.name, "Alice");
            assert.equal(invite.avatarUrl, aliceAvatarUrl);
            assert.equal(invite.timestamp, 1003);
            assert.equal(invite.isEncrypted, true);
            assert.equal(invite.isDirectMessage, true);
            assert(invite.inviter);
            assert.equal(invite.inviter.userId, "@alice:hs.tld");
            assert.equal(invite.inviter.displayName, "Alice");
            assert.equal(invite.inviter.avatarUrl, aliceAvatarUrl);
        },
        "syncing with membership from invite removes the invite": async assert => {
            let removedEmitted = false;
            const invite = new Invite({
                roomId,
                clock: new MockClock(1003),
                user: {id: "@bob:hs.tld"},
                emitCollectionRemove: emittingInvite => {
                    assert.equal(emittingInvite, invite);
                    removedEmitted = true;
                } 
            });
            const txn = createStorage();
            const changes = await invite.writeSync("invite", dmInviteFixture, txn, new NullLogItem());
            assert.equal(txn.invitesMap.get(roomId).roomId, roomId);
            invite.afterSync(changes);
            const joinChanges = await invite.writeSync("join", null, txn, new NullLogItem());
            assert(!removedEmitted);
            invite.afterSync(joinChanges);
            assert.equal(txn.invitesMap.get(roomId), undefined);
            assert(removedEmitted);
        }
    }
}