mirror of
https://github.com/vector-im/element-call.git
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Robin
53a0e273d6
A transport with only a LiveKit SFU `url` has to be authenticated through our own homeserver, which needs to know the name of the server owning the SFU. Carry that name alongside the transport as a TransportLocator, derived from the member's user ID for remote transports and from the client's domain for our own, and key the connection map on the SFU URL, the service URL and the server name together so that `url`, service URL and combined transport shapes are deduplicated consistently.
107 lines
2.8 KiB
TypeScript
107 lines
2.8 KiB
TypeScript
/*
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Copyright 2025 Element Creations Ltd.
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SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
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Please see LICENSE in the repository root for full details.
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*/
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import {
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type CallMembership,
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type MatrixRTCSession,
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MatrixRTCSessionEvent,
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isUnstableLivekitTransport,
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} from "matrix-js-sdk/lib/matrixrtc";
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import { fromEvent } from "rxjs";
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import {
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Epoch,
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mapEpoch,
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trackEpoch,
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type ObservableScope,
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} from "./ObservableScope";
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import { type Behavior } from "./Behavior";
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import { type TransportLocator } from "../livekit/auth";
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/**
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* Tracks the transports used by ourselves, plus all other MatrixRTC session
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* members.
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*/
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export const membershipsAndTransports$ = (
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scope: ObservableScope,
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memberships$: Behavior<Epoch<CallMembership[]>>,
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): {
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membershipsWithTransport$: Behavior<
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Epoch<
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{ membership: CallMembership; transport: TransportLocator | undefined }[]
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>
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>;
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transports$: Behavior<Epoch<TransportLocator[]>>;
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} => {
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const membershipsWithTransport$: Behavior<
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Epoch<
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{ membership: CallMembership; transport: TransportLocator | undefined }[]
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>
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> = scope.behavior(
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memberships$.pipe(
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mapEpoch((memberships) => {
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return memberships.map((membership) => {
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const transport = membership.getTransport();
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return {
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membership,
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transport: isUnstableLivekitTransport(transport)
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? {
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transport,
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serverName: membership.userId.replace(/^.*?:/, ""),
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}
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: undefined,
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};
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});
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}),
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),
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);
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const transports$: Behavior<Epoch<TransportLocator[]>> = scope.behavior(
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membershipsWithTransport$.pipe(
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mapEpoch((mts) => mts.flatMap(({ transport: t }) => (t ? [t] : []))),
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),
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);
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return {
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membershipsWithTransport$,
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transports$,
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};
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};
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export const createMemberships$ = (
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scope: ObservableScope,
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matrixRTCSession: MatrixRTCSession,
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): Behavior<Epoch<CallMembership[]>> => {
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return scope.behavior(
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fromEvent(
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matrixRTCSession,
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MatrixRTCSessionEvent.MembershipsChanged,
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(_, memberships: CallMembership[]) => memberships,
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).pipe(trackEpoch()),
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new Epoch(matrixRTCSession.memberships),
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);
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};
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/**
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* Whether the session has grown large enough that MatrixRTC has stopped rotating the media
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* encryption key. While this is true the key in use is still shared with new joiners, but no new
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* key is generated when someone joins or leaves.
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*/
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export const createKeyRotationSuppressed$ = (
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scope: ObservableScope,
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matrixRTCSession: MatrixRTCSession,
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): Behavior<boolean> => {
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return scope.behavior(
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fromEvent(
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matrixRTCSession,
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MatrixRTCSessionEvent.KeyRotationSuppressedChanged,
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(suppressed: boolean) => suppressed,
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),
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matrixRTCSession.isKeyRotationSuppressed,
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);
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};
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