Look up tile server info in homeserver's .well-known area

src/components/views/location/LocationPicker.tsx

@@ -18,15 +18,17 @@ import React, { SyntheticEvent } from 'react';
 import maplibregl from 'maplibre-gl';
 import { logger } from "matrix-js-sdk/src/logger";
 import { RoomMember } from 'matrix-js-sdk/src/models/room-member';
+import { IClientWellKnown } from 'matrix-js-sdk/src/client';
 
-import SdkConfig from '../../../SdkConfig';
 import DialogButtons from "../elements/DialogButtons";
 import { _t } from '../../../languageHandler';
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 import MemberAvatar from '../avatars/MemberAvatar';
 import MatrixClientContext from '../../../contexts/MatrixClientContext';
 import Modal from '../../../Modal';
 import ErrorDialog from '../dialogs/ErrorDialog';
+import { findMapStyleUrl } from '../messages/MLocationBody';
+import { tileServerFromWellKnown } from '../../../utils/WellKnownUtils';
 
 interface IProps {
     sender: RoomMember;
@@ -51,9 +53,9 @@ interface IState {
 class LocationPicker extends React.Component<IProps, IState> {
     public static contextType = MatrixClientContext;
     public context!: React.ContextType<typeof MatrixClientContext>;
-    private map: maplibregl.Map;
-    private geolocate: maplibregl.GeolocateControl;
-    private marker: maplibregl.Marker;
+    private map?: maplibregl.Map= null;
+    private geolocate?: maplibregl.GeolocateControl = null;
+    private marker?: maplibregl.Marker = null;
 
     constructor(props: IProps) {
         super(props);
@@ -69,15 +71,16 @@ class LocationPicker extends React.Component<IProps, IState> {
     };
 
     componentDidMount() {
-        const config = SdkConfig.get();
-        this.map = new maplibregl.Map({
-            container: 'mx_LocationPicker_map',
-            style: config.map_style_url,
-            center: [0, 0],
-            zoom: 1,
-        });
+        this.context.on("WellKnown.client", this.updateStyleUrl);
 
         try {
+            this.map = new maplibregl.Map({
+                container: 'mx_LocationPicker_map',
+                style: findMapStyleUrl(),
+                center: [0, 0],
+                zoom: 1,
+            });
+
             // Add geolocate control to the map.
             this.geolocate = new maplibregl.GeolocateControl({
                 positionOptions: {
@@ -124,18 +127,26 @@ class LocationPicker extends React.Component<IProps, IState> {
 
             this.geolocate.on('geolocate', this.onGeolocate);
         } catch (e) {
-            logger.error("Failed to render map", e.error);
-            this.setState({ error: e.error });
+            logger.error("Failed to render map", e);
+            this.setState({ error: e });
         }
     }
 
     componentWillUnmount() {
         this.geolocate?.off('geolocate', this.onGeolocate);
+        this.context.off("WellKnown.client", this.updateStyleUrl);
     }
 
+    private updateStyleUrl = (clientWellKnown: IClientWellKnown) => {
+        const style = tileServerFromWellKnown(clientWellKnown)?.["map_style_url"];
+        if (style) {
+            this.map?.setStyle(style);
+        }
+    };
+
     private onGeolocate = (position: GeolocationPosition) => {
         this.setState({ position });
-        this.marker.setLngLat(
+        this.marker?.setLngLat(
             new maplibregl.LngLat(
                 position.coords.longitude,
                 position.coords.latitude,

src/components/views/location/LocationViewDialog.tsx

@@ -16,13 +16,16 @@ limitations under the License.
 
 import React from 'react';
 import { MatrixEvent } from 'matrix-js-sdk/src/models/event';
+import { IClientWellKnown, MatrixClient } from 'matrix-js-sdk/src/client';
 
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 import BaseDialog from "../dialogs/BaseDialog";
 import { IDialogProps } from "../dialogs/IDialogProps";
 import { createMap, LocationBodyContent, locationEventGeoUri, parseGeoUri } from '../messages/MLocationBody';
+import { tileServerFromWellKnown } from '../../../utils/WellKnownUtils';
 
 interface IProps extends IDialogProps {
+    matrixClient: MatrixClient;
     mxEvent: MatrixEvent;
 }
 
@@ -50,6 +53,8 @@ export default class LocationViewDialog extends React.Component<IProps, IState>
             return;
         }
 
+        this.props.matrixClient.on("WellKnown.client", this.updateStyleUrl);
+
         this.map = createMap(
             this.coords,
             true,
@@ -59,6 +64,17 @@ export default class LocationViewDialog extends React.Component<IProps, IState>
         );
     }
 
+    componentWillUnmount() {
+        this.props.matrixClient.off("WellKnown.client", this.updateStyleUrl);
+    }
+
+    private updateStyleUrl = (clientWellKnown: IClientWellKnown) => {
+        const style = tileServerFromWellKnown(clientWellKnown)?.["map_style_url"];
+        if (style) {
+            this.map?.setStyle(style);
+        }
+    };
+
     private getBodyId = () => {
         return `mx_LocationViewDialog_${this.props.mxEvent.getId()}`;
     };

src/components/views/messages/MLocationBody.tsx

@@ -24,6 +24,7 @@ import {
     ILocationContent,
     LOCATION_EVENT_TYPE,
 } from 'matrix-js-sdk/src/@types/location';
+import { IClientWellKnown } from 'matrix-js-sdk/src/client';
 
 import SdkConfig from '../../../SdkConfig';
 import { replaceableComponent } from "../../../utils/replaceableComponent";
@@ -35,16 +36,21 @@ import LocationViewDialog from '../location/LocationViewDialog';
 import TooltipTarget from '../elements/TooltipTarget';
 import { Alignment } from '../elements/Tooltip';
 import AccessibleButton from '../elements/AccessibleButton';
+import { getTileServerWellKnown, tileServerFromWellKnown } from '../../../utils/WellKnownUtils';
+import MatrixClientContext from '../../../contexts/MatrixClientContext';
 
 interface IState {
     error: Error;
 }
 
 @replaceableComponent("views.messages.MLocationBody")
 export default class MLocationBody extends React.Component<IBodyProps, IState> {
+    public static contextType = MatrixClientContext;
+    public context!: React.ContextType<typeof MatrixClientContext>;
     private coords: GeolocationCoordinates;
     private bodyId: string;
     private markerId: string;
+    private map?: maplibregl.Map = null;
 
     constructor(props: IBodyProps) {
         super(props);
@@ -65,7 +71,9 @@ export default class MLocationBody extends React.Component<IBodyProps, IState> {
             return;
         }
 
-        createMap(
+        this.context.on("WellKnown.client", this.updateStyleUrl);
+
+        this.map = createMap(
             this.coords,
             false,
             this.bodyId,
@@ -74,6 +82,17 @@ export default class MLocationBody extends React.Component<IBodyProps, IState> {
         );
     }
 
+    componentWillUnmount() {
+        this.context.off("WellKnown.client", this.updateStyleUrl);
+    }
+
+    private updateStyleUrl = (clientWellKnown: IClientWellKnown) => {
+        const style = tileServerFromWellKnown(clientWellKnown)?.["map_style_url"];
+        if (style) {
+            this.map?.setStyle(style);
+        }
+    };
+
     private onClick = (
         event: React.MouseEvent<HTMLDivElement, MouseEvent>,
     ) => {
@@ -87,7 +106,10 @@ export default class MLocationBody extends React.Component<IBodyProps, IState> {
             'Location View',
             '',
             LocationViewDialog,
-            { mxEvent: this.props.mxEvent },
+            {
+                matrixClient: this.context,
+                mxEvent: this.props.mxEvent,
+            },
             "mx_LocationViewDialog_wrapper",
             false, // isPriority
             true, // isStatic
@@ -206,42 +228,68 @@ function ZoomButtons(props: IZoomButtonsProps): React.ReactElement<HTMLDivElemen
     </div>;
 }
 
+/**
+ * Look up what map tile server style URL was provided in the homeserver's
+ * .well-known location, or, failing that, in our local config, or, failing
+ * that, defaults to the same tile server listed by matrix.org.
+ */
+export function findMapStyleUrl(): string {
+    const mapStyleUrl = (
+        getTileServerWellKnown()?.map_style_url ??
+        SdkConfig.get().map_style_url
+    );
+
+    if (!mapStyleUrl) {
+        throw new Error(
+            "'map_style_url' missing from homeserver .well-known area, and " +
+            "missing from from config.json.",
+        );
+    }
+
+    return mapStyleUrl;
+}
+
 export function createMap(
     coords: GeolocationCoordinates,
     interactive: boolean,
     bodyId: string,
     markerId: string,
     onError: (error: Error) => void,
 ): maplibregl.Map {
-    const styleUrl = SdkConfig.get().map_style_url;
-    const coordinates = new maplibregl.LngLat(coords.longitude, coords.latitude);
-
-    const map = new maplibregl.Map({
-        container: bodyId,
-        style: styleUrl,
-        center: coordinates,
-        zoom: 15,
-        interactive,
-    });
-
-    new maplibregl.Marker({
-        element: document.getElementById(markerId),
-        anchor: 'bottom',
-        offset: [0, -1],
-    })
-        .setLngLat(coordinates)
-        .addTo(map);
-
-    map.on('error', (e) => {
-        logger.error(
-            "Failed to load map: check map_style_url in config.json has a "
-            + "valid URL and API key",
-            e.error,
-        );
-        onError(e.error);
-    });
-
-    return map;
+    try {
+        const styleUrl = findMapStyleUrl();
+        const coordinates = new maplibregl.LngLat(coords.longitude, coords.latitude);
+
+        const map = new maplibregl.Map({
+            container: bodyId,
+            style: styleUrl,
+            center: coordinates,
+            zoom: 15,
+            interactive,
+        });
+
+        new maplibregl.Marker({
+            element: document.getElementById(markerId),
+            anchor: 'bottom',
+            offset: [0, -1],
+        })
+            .setLngLat(coordinates)
+            .addTo(map);
+
+        map.on('error', (e) => {
+            logger.error(
+                "Failed to load map: check map_style_url in config.json has a "
+                + "valid URL and API key",
+                e.error,
+            );
+            onError(e.error);
+        });
+
+        return map;
+    } catch (e) {
+        logger.error("Failed to render map", e);
+        onError(e);
+    }
 }
 
 /**

src/utils/WellKnownUtils.ts

@@ -14,11 +14,16 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+import { IClientWellKnown } from 'matrix-js-sdk/src/client';
+import { UnstableValue } from 'matrix-js-sdk/src/NamespacedValue';
+
 import { MatrixClientPeg } from '../MatrixClientPeg';
 
 const CALL_BEHAVIOUR_WK_KEY = "io.element.call_behaviour";
 const E2EE_WK_KEY = "io.element.e2ee";
 const E2EE_WK_KEY_DEPRECATED = "im.vector.riot.e2ee";
+const TILE_SERVER_WK_KEY = new UnstableValue(
+    "m.tile_server", "org.matrix.msc3488.tile_server");
 
 /* eslint-disable camelcase */
 export interface ICallBehaviourWellKnown {
@@ -30,6 +35,10 @@ export interface IE2EEWellKnown {
     secure_backup_required?: boolean;
     secure_backup_setup_methods?: SecureBackupSetupMethod[];
 }
+
+export interface ITileServerWellKnown {
+    map_style_url?: string;
+}
 /* eslint-enable camelcase */
 
 export function getCallBehaviourWellKnown(): ICallBehaviourWellKnown {
@@ -48,6 +57,19 @@ export function getE2EEWellKnown(): IE2EEWellKnown {
     return null;
 }
 
+export function getTileServerWellKnown(): ITileServerWellKnown | undefined {
+    return tileServerFromWellKnown(MatrixClientPeg.get().getClientWellKnown());
+}
+
+export function tileServerFromWellKnown(
+    clientWellKnown?: IClientWellKnown | undefined,
+): ITileServerWellKnown {
+    return (
+        clientWellKnown?.[TILE_SERVER_WK_KEY.name] ??
+        clientWellKnown?.[TILE_SERVER_WK_KEY.altName]
+    );
+}
+
 export function isSecureBackupRequired(): boolean {
     const wellKnown = getE2EEWellKnown();
     return wellKnown && wellKnown["secure_backup_required"] === true;