add m.location support

Needs cross-platform testing. Currently only tested on Android.

android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 	<uses-permission android:name="android.permission.INTERNET" />
+	<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+	<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
 	<uses-permission
 		android:name="android.permission.READ_EXTERNAL_STORAGE"
 		android:maxSdkVersion="32" />

ios/Runner/Info.plist

@@ -76,5 +76,7 @@
 		<string>UIInterfaceOrientationLandscapeLeft</string>
 		<string>UIInterfaceOrientationLandscapeRight</string>
 	</array>
+	<key>NSLocationWhenInUseUsageDescription</key>
+	<string>Nexus uses your location only when you choose to share it in a message.</string>
 </dict>
 </plist>

lib/controllers/room_chat.dart

@@ -20,6 +20,7 @@ import "package:nexus/models/direction.dart";
 import "package:nexus/models/event.dart";
 import "package:nexus/models/requests/redact_event.dart";
 import "package:nexus/models/relation_type.dart";
+import "package:nexus/models/content/message.dart";
 import "package:nexus/models/requests/send_message.dart";
 import "package:nexus/models/room.dart";
 import "package:nexus/models/room_chat.dart";
@@ -415,6 +416,17 @@ class RoomChatController(final ChatParams info)
     repliedEventRowId: repliedEventRowId,
   );
 
+  Future<void> sendLocation(
+    LocationMessageContent location, {
+    bool shouldMention = true,
+    int? repliedEventRowId,
+  }) => sendWithReply(
+    .message,
+    location,
+    shouldMention: shouldMention,
+    repliedEventRowId: repliedEventRowId,
+  );
+
   /// Completes once the event has come down sync.
   Future<void> sendPollReference(
     Event poll,

lib/helpers/current_location_helper.dart

@@ -0,0 +1,82 @@
+import "dart:async";
+import "dart:io";
+
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:geolocator/geolocator.dart";
+import "package:latlong2/latlong.dart";
+import "package:nexus/controllers/portal.dart";
+import "package:nexus/models/location_exception.dart";
+
+class CurrentLocationHelper(final Ref ref) {
+  static const _timeLimit = Duration(seconds: 10);
+
+  /// The user's location and its accuracy in meters, or null if [askPermission]
+  /// is off and they haven't allowed it.
+  Future<(LatLng, double?)?> get({required bool askPermission}) async {
+    // geolocator talks to GeoClue directly, which Flatpak's sandbox blocks, so
+    // Linux uses the location portal, which also asks the user for permission
+    if (Platform.isLinux) {
+      // The portal can't say whether it's allowed without asking
+      if (!askPermission) return null;
+
+      try {
+        final portal = await ref.read(PortalController.provider.future);
+        final location = await portal.location
+            .createSession(accuracy: .exact)
+            .first
+            .timeout(_timeLimit);
+
+        return switch ((location.latitude, location.longitude)) {
+          (final latitude?, final longitude?) => (
+            LatLng(latitude, longitude),
+            location.accuracy,
+          ),
+          _ => throw LocationException.failed,
+        };
+      } on TimeoutException {
+        throw LocationException.timedOut;
+      } catch (_) {
+        throw LocationException.failed;
+      }
+    }
+
+    if (!await Geolocator.isLocationServiceEnabled()) {
+      if (!askPermission) return null;
+      throw LocationException.servicesOff;
+    }
+
+    var permission = await Geolocator.checkPermission();
+    if (permission == .denied && askPermission) {
+      permission = await Geolocator.requestPermission();
+    }
+    if (permission == .denied || permission == .deniedForever) {
+      if (!askPermission) return null;
+      throw LocationException.denied;
+    }
+
+    Position? position;
+    try {
+      position = await Geolocator.getCurrentPosition(
+        locationSettings: Platform.isAndroid
+            // Play services' location can hang without Google, like on microG,
+            // so this uses Android's own, as other apps do
+            ? AndroidSettings(forceLocationManager: true, timeLimit: _timeLimit)
+            : const LocationSettings(timeLimit: _timeLimit),
+      );
+    } on TimeoutException {
+      // A fix can take long indoors, but another app may have a recent one
+      position = await Geolocator.getLastKnownPosition(
+        forceAndroidLocationManager: true,
+      );
+    } catch (_) {
+      throw LocationException.failed;
+    }
+    if (position == null) throw LocationException.timedOut;
+
+    return (LatLng(position.latitude, position.longitude), position.accuracy);
+  }
+
+  static final provider = Provider<CurrentLocationHelper>(
+    CurrentLocationHelper.new,
+  );
+}

lib/helpers/extensions/build_event_options.dart

@@ -173,7 +173,9 @@ extension BuildEventOptions on Event {
           ),
         ),
 
-      if (content is MessageContent && sender == userId)
+      if (content is MessageContent &&
+          content is! LocationMessageContent &&
+          sender == userId)
         PopupMenuItem(
           onTap: () => onRelation(rowId, .edit),
           child: const ListTile(leading: Icon(Icons.edit), title: Text("Edit")),

lib/helpers/extensions/show_adaptive_sheet.dart

@@ -4,7 +4,10 @@ import "package:nexus/helpers/extensions/is_desktop.dart";
 extension ShowAdaptiveSheet on BuildContext {
   /// Shows the widget from [builder] in a dialog on desktop, or a bottom sheet
   /// on mobile. Use the context passed to [builder] to close it.
-  Future<T?> showAdaptiveSheet<T>(WidgetBuilder builder) => isDesktop
+  Future<T?> showAdaptiveSheet<T>(
+    WidgetBuilder builder, {
+    bool enableDrag = true,
+  }) => isDesktop
       ? showDialog<T>(
           context: this,
           builder: (context) => Dialog(
@@ -18,6 +21,7 @@ extension ShowAdaptiveSheet on BuildContext {
       : showModalBottomSheet<T>(
           context: this,
           isScrollControlled: true,
+          enableDrag: enableDrag,
           constraints: .new(maxHeight: MediaQuery.sizeOf(this).height - 80),
           builder: (context) => SafeArea(child: builder(context)),
         );

lib/models/content/message.dart

@@ -4,6 +4,7 @@ import "package:nexus/models/content/content.dart";
 import "package:nexus/models/info/file.dart";
 import "package:nexus/models/info/image.dart";
 import "package:nexus/models/info/video.dart";
+import "package:nexus/models/location.dart";
 part "message.freezed.dart";
 part "message.g.dart";
 
@@ -90,8 +91,12 @@ sealed class MessageContent extends Content with _$MessageContent {
   }) = VideoMessageContent;
 
   @FreezedUnionValue("m.location")
-  factory MessageContent.location({required String body, required Uri geoUri}) =
-      LocationMessageContent;
+  factory MessageContent.location({
+    required String body,
+    required Uri geoUri,
+    @JsonKey(name: "m.location", includeIfNull: false) LocationInfo? location,
+    @JsonKey(name: "m.asset", includeIfNull: false) LocationAsset? asset,
+  }) = LocationMessageContent;
 
   factory MessageContent.fromJson(Map<String, Object?> json) =>
       _$MessageContentFromJson(json);

lib/models/location.dart

@@ -0,0 +1,84 @@
+import "package:freezed_annotation/freezed_annotation.dart";
+import "package:latlong2/latlong.dart";
+import "package:nexus/models/content/message.dart";
+
+part "location.freezed.dart";
+part "location.g.dart";
+
+/// A location message's `m.location` block.
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable(includeIfNull: false)
+class const LocationInfo({required final Uri uri, final String? description})
+    with _$LocationInfo {
+  Map<String, Object?> toJson() => _$LocationInfoToJson(this);
+
+  factory LocationInfo.fromJson(Map<String, Object?> json) =>
+      _$LocationInfoFromJson(json);
+}
+
+/// A location message's `m.asset` block.
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable()
+class const LocationAsset({
+  @JsonKey(unknownEnumValue: LocationAssetType.pin)
+  final LocationAssetType type = .self,
+}) with _$LocationAsset {
+  Map<String, Object?> toJson() => _$LocationAssetToJson(this);
+
+  factory LocationAsset.fromJson(Map<String, Object?> json) =>
+      _$LocationAssetFromJson(json);
+}
+
+enum LocationAssetType {
+  @JsonValue("m.self")
+  self,
+
+  @JsonValue("m.pin")
+  pin,
+}
+
+extension LocationMessagePoint on LocationMessageContent {
+  LatLng? get point => location?.uri.latLng ?? geoUri.latLng;
+
+  String? get description => switch (location?.description?.trim()) {
+    final description? when description.isNotEmpty => description,
+    _ => null,
+  };
+
+  LocationAssetType get assetType => asset?.type ?? .self;
+}
+
+extension FormatLatLng on LatLng {
+  String get formatted =>
+      "${latitude.toStringAsFixed(5)}, ${longitude.toStringAsFixed(5)}";
+}
+
+extension GeoUri on Uri {
+  /// The coordinates of a geo: URI, like `geo:51.5,-0.12;u=35`.
+  LatLng? get latLng {
+    if (scheme != "geo") return null;
+    final coordinates = path.split(";").first.split(",");
+    if (coordinates.length < 2) return null;
+
+    return switch ((
+      double.tryParse(coordinates[0]),
+      double.tryParse(coordinates[1]),
+    )) {
+      (final latitude?, final longitude?)
+          when latitude.abs() <= 90 && longitude.abs() <= 180 =>
+        LatLng(latitude, longitude),
+      _ => null,
+    };
+  }
+
+  static Uri openStreetMap(LatLng point) => Uri.https(
+    "www.openstreetmap.org",
+    "/",
+    {"mlat": "${point.latitude}", "mlon": "${point.longitude}"},
+  ).replace(fragment: "map=16/${point.latitude}/${point.longitude}");
+
+  static Uri fromLatLng(LatLng point, {double? uncertainty}) => Uri.parse(
+    "geo:${point.latitude},${point.longitude}"
+    "${uncertainty == null ? "" : ";u=${uncertainty.round()}"}",
+  );
+}

lib/models/location_exception.dart

@@ -0,0 +1,11 @@
+enum LocationException(final String message) implements Exception {
+  servicesOff("Location services are turned off."),
+  denied("Nexus doesn't have permission to see your location."),
+  timedOut("Couldn't get your location in time."),
+  failed(
+    "Couldn't get your location. Check that location services are on, and that Nexus is allowed to use them.",
+  );
+
+  @override
+  String toString() => message;
+}

lib/widgets/composer/composer.dart

@@ -25,6 +25,8 @@ import "package:nexus/models/image_pack.dart";
 import "package:nexus/widgets/mxc_emoji.dart";
 import "package:nexus/widgets/sticker_picker.dart";
 import "package:nexus/widgets/create_poll_sheet.dart";
+import "package:nexus/widgets/location_picker_sheet.dart";
+import "package:nexus/models/location.dart";
 import "package:nexus/models/relation_type.dart";
 import "package:nexus/widgets/composer/overlays/tagger_overlay.dart";
 import "package:nexus/widgets/composer/paste_files_action.dart";
@@ -57,6 +59,11 @@ class const Composer(
     required bool shouldMention,
   })
   onSendPoll,
+  required final Future<void> Function(
+    LocationMessageContent location, {
+    required bool shouldMention,
+  })
+  onSendLocation,
   final FocusNode? node,
   super.key,
 }) extends HookConsumerWidget {
@@ -110,13 +117,16 @@ class const Composer(
     final sticker = useState<(String, PackImage)?>(null);
 
     final poll = useState<PollStart?>(null);
+    final location = useState<LocationMessageContent?>(null);
     useEffect(() {
       sticker.value = null;
       poll.value = null;
+      location.value = null;
       return null;
     }, [roomId]);
 
-    final hasReplacement = sticker.value != null || poll.value != null;
+    final hasReplacement =
+        sticker.value != null || poll.value != null || location.value != null;
 
     // The relation type stays as edit after cancelling an edit
     final isEditing = relationType == .edit && relatedEvent != null;
@@ -126,6 +136,7 @@ class const Composer(
         textBefore.value ??= controller.text;
         sticker.value = null;
         poll.value = null;
+        location.value = null;
 
         final text =
             relatedEvent.localContent?.editSource ??
@@ -243,11 +254,14 @@ class const Composer(
           onSendSticker(shortcode, image, shouldMention: shouldMention.value);
         } else if (poll.value case final draft?) {
           onSendPoll(draft, shouldMention: shouldMention.value);
+        } else if (location.value case final draft?) {
+          onSendLocation(draft, shouldMention: shouldMention.value);
         }
         onDismiss();
         // The draft is kept, so it can still be sent after the replacement
         sticker.value = null;
         poll.value = null;
+        location.value = null;
         node?.requestFocus();
         return;
       }
@@ -443,6 +457,22 @@ class const Composer(
                                       leading: Icon(Icons.poll),
                                     ),
                                   ),
+                                PopupMenuItem(
+                                  enabled: !isEditing,
+                                  onTap: () => context.showAdaptiveSheet(
+                                    enableDrag: false,
+                                    (context) => LocationPickerSheet(
+                                      onPick: (picked) {
+                                        Navigator.of(context).pop();
+                                        location.value = picked;
+                                      },
+                                    ),
+                                  ),
+                                  child: ListTile(
+                                    title: Text("Location"),
+                                    leading: Icon(Icons.location_on),
+                                  ),
+                                ),
                               ],
                               icon: Icon(Icons.add),
                             ),
@@ -451,8 +481,12 @@ class const Composer(
                               child: AnimatedSize(
                                 duration: Durations.short4,
                                 alignment: .bottomCenter,
-                                child: switch ((sticker.value, poll.value)) {
-                                  (_, final draft?) => ComposerReplacement(
+                                child: switch ((
+                                  sticker.value,
+                                  poll.value,
+                                  location.value,
+                                )) {
+                                  (_, final draft?, _) => ComposerReplacement(
                                     removeTooltip: "Remove poll",
                                     onRemove: () {
                                       poll.value = null;
@@ -474,7 +508,7 @@ class const Composer(
                                       ),
                                     ),
                                   ),
-                                  ((final shortcode, final image)?, _) =>
+                                  ((final shortcode, final image)?, _, _) =>
                                     ComposerReplacement(
                                       removeTooltip: "Remove sticker",
                                       onRemove: () {
@@ -493,7 +527,35 @@ class const Composer(
                                         ),
                                       ),
                                     ),
-                                  (null, null) => FlutterTagger(
+                                  (_, _, final draft?) => ComposerReplacement(
+                                    removeTooltip: "Remove location",
+                                    onRemove: () {
+                                      location.value = null;
+                                      node?.requestFocus();
+                                    },
+                                    onKeyEvent: sendOnEnter,
+                                    ListTile(
+                                      leading: Icon(
+                                        draft.assetType == .pin
+                                            ? Icons.location_pin
+                                            : Icons.my_location,
+                                        color: theme.colorScheme.primary,
+                                      ),
+                                      title: Text(
+                                        draft.description ??
+                                            (draft.assetType == .pin
+                                                ? "Location"
+                                                : "My location"),
+                                      ),
+                                      subtitle: Text(
+                                        draft.point?.formatted ??
+                                            draft.geoUri.toString(),
+                                        maxLines: 1,
+                                        overflow: .ellipsis,
+                                      ),
+                                    ),
+                                  ),
+                                  (null, null, null) => FlutterTagger(
                                     triggerStrategy: .eager,
                                     // Characters that continue a search, for
                                     // e.g. :+1, :custom_emoji or @user:server

lib/widgets/location_map.dart

@@ -0,0 +1,83 @@
+import "package:flutter_map/flutter_map.dart";
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:latlong2/latlong.dart";
+import "package:material_ui/material_ui.dart";
+import "package:nexus/helpers/launch_helper.dart";
+
+class const LocationMap(
+  final LatLng center, {
+  final bool showMarker = true,
+  final bool interactive = false,
+  final double zoom = 15,
+  final MapController? controller,
+  final PositionCallback? onPositionChanged,
+  super.key,
+}) extends ConsumerWidget {
+  /// The marker's icon, which points at the location from its bottom.
+  static Widget markerOf(BuildContext context) => Icon(
+    Icons.location_pin,
+    size: 40,
+    color: Theme.of(context).colorScheme.primary,
+  );
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) => FlutterMap(
+    mapController: controller,
+    options: MapOptions(
+      initialCenter: center,
+      initialZoom: zoom,
+      minZoom: 2,
+      maxZoom: 19,
+      onPositionChanged: onPositionChanged,
+      interactionOptions: InteractionOptions(
+        flags: interactive
+            ? InteractiveFlag.all & ~InteractiveFlag.rotate
+            : InteractiveFlag.none,
+      ),
+    ),
+    children: [
+      TileLayer(
+        urlTemplate: "https://tile.openstreetmap.org/{z}/{x}/{y}.png",
+        // Required by OpenStreetMap's tile usage policy
+        userAgentPackageName: "nexus.federated.nexus",
+      ),
+      if (showMarker)
+        MarkerLayer(
+          markers: [
+            Marker(
+              point: center,
+              width: 40,
+              height: 40,
+              alignment: .topCenter,
+              child: markerOf(context),
+            ),
+          ],
+        ),
+      // Required by OpenStreetMap
+      Align(
+        alignment: .bottomRight,
+        child: Material(
+          color: Theme.of(context).colorScheme.surface.withValues(alpha: 0.8),
+          child: InkWell(
+            onTap: interactive
+                ? () => ref
+                      .read(LaunchHelper.provider)
+                      .launchUrl(
+                        Uri.https("www.openstreetmap.org", "/copyright"),
+                      )
+                : null,
+            child: Padding(
+              padding: const .symmetric(horizontal: 4, vertical: 2),
+              child: Text(
+                "© OpenStreetMap",
+                style: Theme.of(context).textTheme.labelSmall,
+                maxLines: 1,
+                overflow: .ellipsis,
+              ),
+            ),
+          ),
+        ),
+      ),
+    ],
+  );
+}

lib/widgets/location_message.dart

@@ -0,0 +1,68 @@
+import "package:material_ui/material_ui.dart";
+import "package:nexus/helpers/extensions/show_adaptive_sheet.dart";
+import "package:nexus/models/content/message.dart";
+import "package:nexus/models/location.dart";
+import "package:nexus/widgets/location_map.dart";
+import "package:nexus/widgets/location_viewer_sheet.dart";
+
+class const LocationMessage(final LocationMessageContent content, {super.key})
+    extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    final point = content.point;
+    final description = content.description;
+
+    if (point == null) {
+      return Wrap(
+        spacing: 8,
+        children: [
+          Text(
+            "Invalid location:",
+            style: TextStyle(color: theme.colorScheme.error),
+          ),
+          Text(content.body),
+        ],
+      );
+    }
+
+    return Column(
+      crossAxisAlignment: .start,
+      spacing: 8,
+      children: [
+        if (description != null)
+          Text(description, style: theme.textTheme.titleSmall),
+        ConstrainedBox(
+          constraints: const .new(maxWidth: 400),
+          child: AspectRatio(
+            aspectRatio: 3 / 2,
+            child: ClipRRect(
+              borderRadius: .circular(12),
+              child: Stack(
+                children: [
+                  LocationMap(point),
+                  Positioned.fill(
+                    child: Material(
+                      type: .transparency,
+                      child: InkWell(
+                        onTap: () => context.showAdaptiveSheet(
+                          enableDrag: false,
+                          (_) => LocationViewerSheet(
+                            point,
+                            type: content.assetType,
+                            description: description,
+                          ),
+                        ),
+                      ),
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ),
+        ),
+        Text(point.formatted, style: theme.textTheme.labelSmall),
+      ],
+    );
+  }
+}

lib/widgets/location_picker_sheet.dart

@@ -0,0 +1,157 @@
+import "package:flutter_hooks/flutter_hooks.dart";
+import "package:flutter_map/flutter_map.dart";
+import "package:hooks_riverpod/hooks_riverpod.dart";
+import "package:latlong2/latlong.dart";
+import "package:material_ui/material_ui.dart";
+import "package:nexus/helpers/current_location_helper.dart";
+import "package:nexus/models/content/message.dart";
+import "package:nexus/models/location.dart";
+import "package:nexus/widgets/location_map.dart";
+import "package:nexus/widgets/sheet_layout.dart";
+
+/// Chooses a location to share, either the user's own or a pin dropped on the
+/// map.
+class const LocationPickerSheet({
+  required final void Function(LocationMessageContent location) onPick,
+  super.key,
+}) extends HookConsumerWidget {
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final mapController = useMemoized(MapController.new);
+    useEffect(() => mapController.dispose, [mapController]);
+
+    // Not state, as it changes every frame while the map moves
+    final center = useRef(const LatLng(0, 0));
+
+    // Until the map is moved or the user is located, it's an arbitrary spot
+    final placed = useState(false);
+    // Whether the map is on the user's location, and its accuracy in meters
+    final own = useState<({double? accuracy})?>(null);
+    final locating = useState(false);
+    final error = useState<String?>(null);
+    final descriptionController = useTextEditingController();
+
+    Future<void> locate({bool askPermission = true}) async {
+      locating.value = true;
+      error.value = null;
+      try {
+        final found = await ref
+            .read(CurrentLocationHelper.provider)
+            .get(askPermission: askPermission);
+        // Doesn't move away from a spot the user chose while it was finding them
+        if (found == null ||
+            !context.mounted ||
+            (!askPermission && placed.value)) {
+          return;
+        }
+
+        final (point, accuracy) = found;
+        center.value = point;
+        mapController.move(point, 16);
+        own.value = (accuracy: accuracy);
+        placed.value = true;
+      } catch (caught) {
+        if (context.mounted && askPermission) error.value = caught.toString();
+      } finally {
+        if (context.mounted) locating.value = false;
+      }
+    }
+
+    // Starts at the user's location if they've already allowed it, except on
+    // Linux, where checking would ask
+    useEffect(() {
+      locate(askPermission: false);
+      return null;
+    }, []);
+
+    void share() {
+      final description = descriptionController.text.trim();
+      final self = own.value != null;
+      final geoUri = GeoUri.fromLatLng(
+        center.value,
+        uncertainty: own.value?.accuracy,
+      );
+
+      onPick(
+        .new(
+          body:
+              "${description.isEmpty ? (self ? "My location" : "Location") : description}: $geoUri",
+          geoUri: geoUri,
+          location: .new(
+            uri: geoUri,
+            description: description.isEmpty ? null : description,
+          ),
+          asset: .new(type: self ? .self : .pin),
+        ),
+      );
+    }
+
+    return SheetLayout(
+      title: const Text("Share Location"),
+      actions: [
+        TextButton(
+          onPressed: Navigator.of(context).pop,
+          child: const Text("Cancel"),
+        ),
+        TextButton(
+          onPressed: placed.value ? share : null,
+          child: const Text("Share"),
+        ),
+      ],
+      children: [
+        SizedBox(
+          height: 300,
+          child: ClipRRect(
+            borderRadius: .circular(12),
+            child: Stack(
+              children: [
+                LocationMap(
+                  center.value,
+                  zoom: 2,
+                  interactive: true,
+                  showMarker: false,
+                  controller: mapController,
+                  onPositionChanged: (camera, hasGesture) {
+                    center.value = camera.center;
+                    if (hasGesture) {
+                      own.value = null;
+                      placed.value = true;
+                    }
+                  },
+                ),
+                IgnorePointer(
+                  child: Center(
+                    child: Transform.translate(
+                      offset: const .new(0, -20),
+                      child: LocationMap.markerOf(context),
+                    ),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+        OutlinedButton.icon(
+          onPressed: locating.value ? null : locate,
+          icon: locating.value
+              ? const SizedBox.square(
+                  dimension: 18,
+                  child: CircularProgressIndicator(strokeWidth: 2),
+                )
+              : const Icon(Icons.my_location),
+          label: const Text("Use current location"),
+        ),
+        if (error.value case final error?)
+          Text(
+            error,
+            style: TextStyle(color: Theme.of(context).colorScheme.error),
+          ),
+        TextField(
+          controller: descriptionController,
+          textCapitalization: .sentences,
+          decoration: const .new(labelText: "Description (optional)"),
+        ),
+      ],
+    );
+  }
+}

lib/widgets/location_viewer_sheet.dart

@@ -0,0 +1,43 @@
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:latlong2/latlong.dart";
+import "package:material_ui/material_ui.dart";
+import "package:nexus/helpers/launch_helper.dart";
+import "package:nexus/models/location.dart";
+import "package:nexus/widgets/location_map.dart";
+import "package:nexus/widgets/sheet_layout.dart";
+
+class const LocationViewerSheet(
+  final LatLng point, {
+  final LocationAssetType type = .self,
+  final String? description,
+  super.key,
+}) extends ConsumerWidget {
+  @override
+  Widget build(BuildContext context, WidgetRef ref) => SheetLayout(
+    title: Text(
+      description ?? (type == .self ? "Shared Location" : "Location"),
+    ),
+    actions: [
+      TextButton(
+        onPressed: () => ref
+            .read(LaunchHelper.provider)
+            .launchUrl(GeoUri.openStreetMap(point)),
+        child: const Text("Open in OpenStreetMap"),
+      ),
+      TextButton(
+        onPressed: Navigator.of(context).pop,
+        child: const Text("Close"),
+      ),
+    ],
+    children: [
+      SizedBox(
+        height: 400,
+        child: ClipRRect(
+          borderRadius: .circular(12),
+          child: LocationMap(point, interactive: true),
+        ),
+      ),
+      SelectableText(point.formatted),
+    ],
+  );
+}

lib/widgets/renderers/message.dart

@@ -8,6 +8,7 @@ import "package:nexus/helpers/extensions/get_filename.dart";
 import "package:nexus/helpers/extensions/linkify_html.dart";
 import "package:nexus/models/content/encrypted.dart";
 import "package:nexus/models/content/message.dart";
+import "package:nexus/models/location.dart";
 import "package:nexus/models/content/poll_start.dart";
 import "package:nexus/models/content/sticker.dart";
 import "package:nexus/models/event.dart";
@@ -16,6 +17,7 @@ import "package:nexus/widgets/html/html.dart";
 import "package:nexus/widgets/lazy_loading/message_avatar.dart";
 import "package:nexus/widgets/lazy_loading/message_displayname.dart";
 import "package:nexus/widgets/linkified_text.dart";
+import "package:nexus/widgets/location_message.dart";
 import "package:nexus/widgets/loading.dart";
 import "package:nexus/widgets/message_image.dart";
 import "package:nexus/widgets/reaction_row.dart";
@@ -64,9 +66,18 @@ class const MessageRenderer(
                 overflow: .ellipsis,
               )
             : PollRenderer(event, poll),
-      // TODO: Handle locations
-      // LocationMessageContent(:final body , :final geoUri) =>
       MessageContent content => switch (content) {
+        final LocationMessageContent location =>
+          textOnly
+              ? Text(
+                  switch (location.description) {
+                    final description? => "Location: $description",
+                    null => "Location",
+                  },
+                  maxLines: maxLines,
+                  overflow: .ellipsis,
+                )
+              : LocationMessage(location),
         TextMessageContent(:final body, :final formattedBody, :final format) ||
         NoticeMessageContent(
           :final body,
@@ -167,7 +178,6 @@ class const MessageRenderer(
             ],
           ],
         ),
-        LocationMessageContent(:final String? body) ||
         UnknownMessageContent(:final body) =>
           body == null
               ? Text("This message is redacted", style: errorStyle)

lib/widgets/room_chat/room_chat.dart

@@ -350,6 +350,16 @@ final class const RoomChat({
                                                       repliedEventRowId,
                                                 )
                                                 .onError(showError),
+                                    onSendLocation:
+                                        (location, {required shouldMention}) =>
+                                            notifier
+                                                .sendLocation(
+                                                  location,
+                                                  shouldMention: shouldMention,
+                                                  repliedEventRowId:
+                                                      repliedEventRowId,
+                                                )
+                                                .onError(showError),
                                     relationType: relationType.value,
                                     relatedEvent: relatedEvent.value,
                                     onDismiss: () {

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -9,6 +9,7 @@ import app_links
 import dynamic_color
 import file_selector_macos
 import flutter_local_notifications
+import geolocator_apple
 import media_kit_libs_macos_video
 import media_kit_video
 import package_info_plus
@@ -22,6 +23,7 @@ func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   DynamicColorPlugin.register(with: registry.registrar(forPlugin: "DynamicColorPlugin"))
   FileSelectorPlugin.register(with: registry.registrar(forPlugin: "FileSelectorPlugin"))
   FlutterLocalNotificationsPlugin.register(with: registry.registrar(forPlugin: "FlutterLocalNotificationsPlugin"))
+  GeolocatorPlugin.register(with: registry.registrar(forPlugin: "GeolocatorPlugin"))
   MediaKitLibsMacosVideoPlugin.register(with: registry.registrar(forPlugin: "MediaKitLibsMacosVideoPlugin"))
   MediaKitVideoPlugin.register(with: registry.registrar(forPlugin: "MediaKitVideoPlugin"))
   FPPPackageInfoPlusPlugin.register(with: registry.registrar(forPlugin: "FPPPackageInfoPlusPlugin"))

macos/Runner/DebugProfile.entitlements

@@ -12,5 +12,7 @@
 	<true/>
 	<key>com.apple.security.files.user-selected.read-only</key>
 	<true/>
+	<key>com.apple.security.personal-information.location</key>
+	<true/>
 </dict>
 </plist>

macos/Runner/Info.plist

@@ -42,5 +42,9 @@
 			</array>
 		</dict>
 	</array>
+	<key>NSLocationUsageDescription</key>
+	<string>Nexus uses your location only when you choose to share it in a message.</string>
+	<key>NSLocationWhenInUseUsageDescription</key>
+	<string>Nexus uses your location only when you choose to share it in a message.</string>
 </dict>
 </plist>

macos/Runner/Release.entitlements

@@ -8,5 +8,7 @@
 	<true/>
 	<key>com.apple.security.files.user-selected.read-only</key>
 	<true/>
+	<key>com.apple.security.personal-information.location</key>
+	<true/>
 </dict>
 </plist>