Split out invite context, add empty filter constants

2 files changed, 76 insertions, 0 deletions

diff --git a/Utilities/LibMatrix.Utilities.Bot/Interfaces/IRoomInviteHandler.cs b/Utilities/LibMatrix.Utilities.Bot/Interfaces/IRoomInviteHandler.cs
new file mode 100644

index 0000000..a25ca4a
--- /dev/null
+++ b/Utilities/LibMatrix.Utilities.Bot/Interfaces/IRoomInviteHandler.cs
@@ -0,0 +1,5 @@
+namespace LibMatrix.Utilities.Bot.Interfaces;
+
+public interface IRoomInviteHandler {
+    public Task HandleInviteAsync(RoomInviteContext invite);
+}
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diff --git a/Utilities/LibMatrix.Utilities.Bot/Interfaces/RoomInviteContext.cs b/Utilities/LibMatrix.Utilities.Bot/Interfaces/RoomInviteContext.cs
new file mode 100644

index 0000000..380c1c7
--- /dev/null
+++ b/Utilities/LibMatrix.Utilities.Bot/Interfaces/RoomInviteContext.cs
@@ -0,0 +1,71 @@
+using LibMatrix.EventTypes.Spec.State.RoomInfo;
+using LibMatrix.Homeservers;
+using LibMatrix.Responses;
+
+namespace LibMatrix.Utilities.Bot.Interfaces;
+
+public class RoomInviteContext {
+    public required string RoomId { get; init; }
+    public required AuthenticatedHomeserverGeneric Homeserver { get; init; }
+    public required StateEventResponse MemberEvent { get; init; }
+    public required SyncResponse.RoomsDataStructure.InvitedRoomDataStructure InviteData { get; init; }
+
+    public async Task<string> TryGetInviterNameAsync() {
+        var name = InviteData.InviteState?.Events?
+            .FirstOrDefault(evt => evt is { Type: RoomMemberEventContent.EventId } && evt.StateKey == MemberEvent.Sender)?
+            .ContentAs<RoomMemberEventContent>()?.DisplayName;
+
+        if (!string.IsNullOrWhiteSpace(name))
+            return name;
+
+        try {
+            await Homeserver.GetProfileAsync(MemberEvent.Sender!);
+        }
+        catch {
+            //ignored
+        }
+
+        return MemberEvent.Sender!;
+    }
+
+    public async Task<string> TryGetRoomNameAsync() {
+        // try to get room name from invite state
+        var name = InviteData.InviteState?.Events?
+            .FirstOrDefault(evt => evt is { Type: RoomNameEventContent.EventId, StateKey: "" })?
+            .ContentAs<RoomNameEventContent>()?.Name;
+
+        if (!string.IsNullOrWhiteSpace(name))
+            return name;
+
+        // try to get room alias
+        var alias = InviteData.InviteState?.Events?
+            .FirstOrDefault(evt => evt is { Type: RoomCanonicalAliasEventContent.EventId, StateKey: "" })?
+            .ContentAs<RoomCanonicalAliasEventContent>()?.Alias;
+
+        if (!string.IsNullOrWhiteSpace(alias))
+            return alias;
+
+        // try to get room name via public previews
+        try {
+            name = await Homeserver.GetRoom(RoomId).GetNameOrFallbackAsync();
+            if (name != RoomId && !string.IsNullOrWhiteSpace(name))
+                return name;
+        }
+        catch {
+            //ignored
+        }
+
+        // fallback to room alias via public previews
+        try {
+            alias = (await Homeserver.GetRoom(RoomId).GetCanonicalAliasAsync())?.Alias;
+            if (!string.IsNullOrWhiteSpace(alias))
+                return alias;
+        }
+        catch {
+            //ignored
+        }
+
+        // fall back to room ID
+        return RoomId;
+    }
+}
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