feat: delete chat room

server/routes/chat.ts

@@ -128,6 +128,65 @@ const router = new Hono()
       }
     },
   )
+  /**
+   * Delete a chat room and all its associated data
+   *
+   * This endpoint allows a room member to delete the entire chat room.
+   * It will:
+   * 1. Verify the requesting user is a member of the room
+   * 2. Delete the room (which cascades to messages and memberships due to foreign key constraints)
+   * 3. Broadcast a DeleteRoom event to all room members
+   *
+   * @route DELETE /rooms/:room
+   * @param room - The ID of the room to delete
+   * @returns {Object} Success status
+   * @throws {HTTPException} 404 - If room not found or user is not a member
+   * @throws {HTTPException} 500 - If room deletion fails
+   */
+  .delete(
+    "/rooms/:room",
+    zValidator("param", z.object({ room: z.string() })),
+    zValidator("header", z.object({ Authorization: z.string() })),
+    async (c) => {
+      const userId = await getUserID(c);
+      const { room: roomId } = c.req.valid("param");
+
+      // Verify user is a member of the room to prevent unauthorized deletion
+      const membership = await prisma.belongs.findUnique({
+        where: { userId_roomId: { userId, roomId } },
+        select: { roomId: true },
+      });
+
+      if (!membership) {
+        throw new HTTPException(404, { message: "Room not found or access denied" });
+      }
+
+      // Get all room members before deletion so we can notify them
+      const roomMembers = await prisma.belongs.findMany({
+        where: { roomId },
+        select: { userId: true },
+      });
+      const memberIds = roomMembers.map((member) => member.userId);
+
+      try {
+        // Delete the room - this will cascade to messages and memberships
+        await prisma.room.delete({
+          where: { id: roomId },
+        });
+
+        // Notify all room members that the room was deleted
+        broadcast(memberIds, {
+          event: "DeleteRoom",
+          data: devalue({ roomId }),
+        });
+
+        return c.json({ ok: true }, 200);
+      } catch (err) {
+        console.error("Failed to delete room:", err);
+        throw new HTTPException(500, { message: "Failed to delete room" });
+      }
+    },
+  )
   // ## room preview
   .get("/rooms/preview", zValidator("header", z.object({ Authorization: z.string() })), async (c) => {
     const requester = await getUserID(c);
@@ -540,6 +599,12 @@ type BroadcastEvents =
         id: string;
       }>;
     }
+  | {
+      event: "DeleteRoom";
+      data: Devalue<{
+        roomId: string;
+      }>;
+    }
   | {
       event: "Ping";
       data: "";

web/src/actions/room.ts

@@ -0,0 +1,15 @@
+"use server";
+
+import { deleteRoom as deleteRoomApi } from "@/data/room.server";
+import { revalidatePath } from "next/cache";
+
+export async function deleteRoom(roomId: string) {
+  try {
+    await deleteRoomApi(roomId);
+    revalidatePath("/chat");
+    return { success: true };
+  } catch (error) {
+    console.error("Failed to delete room:", error);
+    return { error: "Failed to delete room" };
+  }
+}

web/src/app/[locale]/(auth)/chat/[id]/page.tsx

@@ -1,5 +1,7 @@
 import Avatar from "@/components/Avatar";
 import Loading from "@/components/Loading.tsx";
+import DeleteRoomButton from "@/components/chat/DeleteRoomButton";
+import { HEADER_HEIGHT_TW } from "@/consts.ts";
 import { getRoomData } from "@/data/room.server.ts";
 import { getMyData } from "@/data/user.server.ts";
 import { Link } from "@/i18n/navigation";
@@ -45,21 +47,26 @@ async function Load({ roomId }: { roomId: string }) {
 function ChatHeader({ room, me }: { room: ContentfulRoom; me: MYDATA }) {
   return (
     <>
-      <div className="invisible h-[56px]" />
-      <div className="fixed top-[56px] z-10 flex w-full items-center bg-stone-200 py-2">
-        <Link href={"/chat"} className="mx-2">
-          <AiOutlineLeft size={25} />
-        </Link>
-        <div className="mr-[33px] w-full text-center text-xl">
-          {room.members
-            .filter((member) => member.user.id !== me.id)
-            .map((member) => (
-              <div key={member.user.id} className=" ml-2 flex items-center gap-2">
-                <Avatar alt={member.user.name || "User"} src={member.user.imageUrl} size={40} />
-                <div>{member.user.name}</div>
-              </div>
-            ))}
+      <div className={`invisible h-${HEADER_HEIGHT_TW}`} />
+      <div
+        className={`fixed top-${HEADER_HEIGHT_TW} z-10 flex w-full items-center justify-between bg-stone-200 px-4 py-2`}
+      >
+        <div className="flex items-center">
+          <Link href={"/chat"} className="mr-2">
+            <AiOutlineLeft size={25} />
+          </Link>
+          <div className="flex items-center text-xl">
+            {room.members
+              .filter((member) => member.user.id !== me.id)
+              .map((member) => (
+                <div key={member.user.id} className="flex items-center gap-2">
+                  <Avatar alt={member.user.name || "User"} src={member.user.imageUrl} size={40} />
+                  <div>{member.user.name}</div>
+                </div>
+              ))}
+          </div>
         </div>
+        <DeleteRoomButton roomId={room.id} />
       </div>
     </>
   );

web/src/app/[locale]/(auth)/users/client.tsx

@@ -5,10 +5,11 @@ import Avatar from "@/components/Avatar";
 import { useAuthContext } from "@/features/auth/providers/AuthProvider";
 import type { FlatUser, MYDATA } from "common/zod/schema";
 import { useTranslations } from "next-intl";
-import router from "next/router";
+import { useRouter } from "next/navigation";
 import { useState } from "react";
 
 export function ClientPage({ me, initUser }: { me: MYDATA; initUser: FlatUser }) {
+  const router = useRouter();
   const [user, setUser] = useState(initUser);
   const { idToken: Authorization } = useAuthContext();
   const t = useTranslations();

web/src/components/Header.tsx

@@ -1,13 +1,15 @@
 "use client";
 
-import { useUserContext } from "@/features/user/userProvider.tsx";
+import { HEADER_HEIGHT_TW } from "@/consts.ts";
 import { useNormalizedPathname } from "@/hooks/useNormalizedPath.ts";
 import { Link } from "@/i18n/navigation.ts";
 import type { MYDATA } from "common/zod/schema";
 import { useTranslations } from "next-intl";
 import { AppIcon } from "./AppIcon.tsx";
 import Avatar from "./Avatar.tsx";
 
+const __HEADER_HEIGHT_CLASSES = `h-${HEADER_HEIGHT_TW} top-${HEADER_HEIGHT_TW}`; // make tailwind compiler happy
+
 export default function Header({ user }: { user: MYDATA | null }) {
   const t = useTranslations();
   const pathname = useNormalizedPathname();
@@ -25,7 +27,7 @@ export default function Header({ user }: { user: MYDATA | null }) {
 
   return (
     <>
-      <header className="fixed top-0 z-10 h-16 w-full bg-tBlue">
+      <header className={`fixed top-0 z-10 h-${HEADER_HEIGHT_TW} w-full bg-tBlue`}>
         <div className="flex h-16 items-center">
           <Link href={user ? "/community" : "/"} passHref className="px-4">
             <AppIcon width={36} height={36} />

web/src/components/chat/DeleteRoomButton.tsx

@@ -0,0 +1,95 @@
+"use client";
+
+import { deleteRoom } from "@/actions/room";
+import { useRouter } from "next/navigation";
+import { useState } from "react";
+
+export default function DeleteRoomButton({ roomId }: { roomId: string }) {
+  const router = useRouter();
+  const [isDeleting, setIsDeleting] = useState(false);
+  const [showConfirm, setShowConfirm] = useState(false);
+
+  const handleDelete = async () => {
+    if (isDeleting) return;
+
+    setIsDeleting(true);
+    try {
+      const result = await deleteRoom(roomId);
+      if (result.error) {
+        throw new Error(result.error);
+      }
+      // The server will broadcast a DeleteRoom event that will be handled by the chat client
+      router.push("/chat");
+    } catch (error) {
+      console.error("Failed to delete room:", error);
+      alert(error instanceof Error ? error.message : "Failed to delete room. Please try again.");
+    } finally {
+      setIsDeleting(false);
+      setShowConfirm(false);
+    }
+  };
+
+  return (
+    <div className="relative">
+      <button
+        type="button"
+        onClick={(e) => {
+          e.preventDefault();
+          setShowConfirm(true);
+        }}
+        className="rounded-full p-2 text-red-600 hover:bg-red-100"
+        title="Delete Room"
+        disabled={isDeleting}
+        aria-label="Delete room"
+      >
+        <svg
+          xmlns="http://www.w3.org/2000/svg"
+          className="h-5 w-5"
+          fill="none"
+          viewBox="0 0 24 24"
+          stroke="currentColor"
+          aria-hidden="true"
+        >
+          <path
+            strokeLinecap="round"
+            strokeLinejoin="round"
+            strokeWidth={2}
+            d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"
+          />
+        </svg>
+      </button>
+
+      {showConfirm && (
+        <div className="absolute right-0 z-50 w-64 rounded-md bg-white p-4 shadow-lg ring-1 ring-black/5">
+          <p className="mb-4 text-gray-700 text-sm">
+            Are you sure you want to delete this chat room? This action cannot be undone.
+          </p>
+          <div className="flex justify-end space-x-2">
+            <button
+              type="button"
+              onClick={(e) => {
+                e.preventDefault();
+                setShowConfirm(false);
+              }}
+              className="rounded px-3 py-1 text-gray-600 text-sm hover:bg-gray-100"
+              disabled={isDeleting}
+            >
+              Cancel
+            </button>
+            <button
+              type="button"
+              onClick={(e) => {
+                e.preventDefault();
+                handleDelete();
+              }}
+              className="rounded bg-red-600 px-3 py-1 text-sm text-white hover:bg-red-700 disabled:opacity-50"
+              disabled={isDeleting}
+            >
+              {isDeleting ? "Deleting..." : "Delete"}
+            </button>
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}

web/src/consts.ts

@@ -5,6 +5,7 @@ export const PATHNAME_LANG_PREFIX_PATTERN = /^\/(ja|en)/;
 export const STEP_1_DATA_SESSION_STORAGE_KEY = "ut_bridge_step_1_data";
 // registration formのimagePreviewUrlをsession storageに保存するkey
 export const IMAGE_PREVIEW_URL_SESSION_STORAGE_KEY = "ut_bridge_image_preview_url";
+export const HEADER_HEIGHT_TW = "16";
 
 export const cookieNames = {
   idToken: "ut-bridge::id-token",

web/src/data/room.server.ts

@@ -21,6 +21,7 @@ export async function getRoomData(roomId: string): Promise<ContentfulRoom> {
       room: roomId,
     },
   });
+  if (!res.ok) throw new Error("Failed to fetch room data");
   const json = await res.json();
   return {
     ...json,
@@ -30,3 +31,19 @@ export async function getRoomData(roomId: string): Promise<ContentfulRoom> {
     })),
   };
 }
+
+export async function deleteRoom(roomId: string): Promise<void> {
+  const idToken = await getIdToken();
+
+  const response = await client.chat.rooms[":room"].$delete({
+    header: { Authorization: idToken },
+    param: { room: roomId },
+  });
+
+  if (!response.ok) {
+    const error = await response.json();
+    throw new Error("Failed to delete room");
+  }
+
+  // Redirect should be handled in the component where this function is called
+}