fix: unify panic room code format and validate room join id

src/lib/validation.test.ts

@@ -7,6 +7,7 @@ import {
   validateIdeaContent,
   validateRoomName,
   requireString,
+  validatePanicRoomId,
 } from "@/lib/validation";
 
 describe("validateUsername", () => {
@@ -125,3 +126,16 @@ describe("requireString", () => {
     expect(() => requireString(123, "字段")).toThrow(ApiError);
   });
 });
+
+describe("validatePanicRoomId", () => {
+  it("accepts 6-char alphanumeric room id and normalizes uppercase", () => {
+    expect(validatePanicRoomId("ab12cd")).toBe("AB12CD");
+    expect(validatePanicRoomId("ROOM01")).toBe("ROOM01");
+  });
+
+  it("rejects invalid room id format", () => {
+    expect(() => validatePanicRoomId("1234")).toThrow(ApiError);
+    expect(() => validatePanicRoomId("1234567")).toThrow(ApiError);
+    expect(() => validatePanicRoomId("12-45a")).toThrow(ApiError);
+  });
+});

src/lib/validation.ts

@@ -48,3 +48,16 @@ export function requireString(value: unknown, fieldName: string): string {
   }
   return value;
 }
+
+const PANIC_ROOM_ID_REGEX = /^[A-Z0-9]{6}$/;
+
+export function validatePanicRoomId(raw: unknown): string {
+  if (!raw || typeof raw !== "string") {
+    throw new ApiError("roomId 不能为空");
+  }
+  const roomId = raw.trim().toUpperCase();
+  if (!PANIC_ROOM_ID_REGEX.test(roomId)) {
+    throw new ApiError("房间号格式无效，应为 6 位字母数字", 400);
+  }
+  return roomId;
+}