Live location share - forward latest location (PSF-1044) (#8860)

* handle beacon location events in ForwardDialog

* add transformer for forwarded events in MessageContextMenu

* remove canForward

* update snapshots for beacon model change

* add comments

* fix bad copy pasted test

* add test for beacon locations

src/events/forward/getForwardableBeacon.ts

@@ -0,0 +1,34 @@
+/*
+Copyright 2022 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 { getBeaconInfoIdentifier } from "matrix-js-sdk/src/matrix";
+
+import { ForwardableEventTransformFunction } from "./types";
+
+/**
+ * Live location beacons should forward their latest location as a static pin location
+ * If the beacon is not live, or doesn't have a location forwarding is not allowed
+ */
+export const getForwardableBeaconEvent: ForwardableEventTransformFunction = (event, cli) => {
+    const room = cli.getRoom(event.getRoomId());
+    const beacon = room.currentState.beacons?.get(getBeaconInfoIdentifier(event));
+    const latestLocationEvent = beacon.latestLocationEvent;
+
+    if (beacon.isLive && latestLocationEvent) {
+        return latestLocationEvent;
+    }
+    return null;
+};

src/events/forward/getForwardableEvent.ts

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+/*
+Copyright 2022 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 { M_POLL_START } from "matrix-events-sdk";
+import { M_BEACON_INFO } from "matrix-js-sdk/src/@types/beacon";
+import { MatrixEvent, MatrixClient } from "matrix-js-sdk/src/matrix";
+
+import { getForwardableBeaconEvent } from "./getForwardableBeacon";
+
+/**
+ * Get forwardable event for a given event
+ * If an event is not forwardable return null
+ */
+export const getForwardableEvent = (event: MatrixEvent, cli: MatrixClient): MatrixEvent | null => {
+    if (M_POLL_START.matches(event.getType())) {
+        return null;
+    }
+    if (M_BEACON_INFO.matches(event.getType())) {
+        return getForwardableBeaconEvent(event, cli);
+    }
+    return event;
+};
+

src/events/forward/types.ts

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+/*
+Copyright 2022 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 { MatrixClient, MatrixEvent } from "matrix-js-sdk/src/matrix";
+
+export type ForwardableEventTransformFunction = (event: MatrixEvent, cli: MatrixClient) => MatrixEvent | null;