Backend half

SerpentRace_Backend/src/RouterFunctions/Users/checkUserExists.ts

@@ -0,0 +1,34 @@
+import { Request, Response } from 'express';
+import { UserQueryDispatcher } from '../../functions/Users/Queries/UserQueryDispatcher';
+import { UserCommandDispatcher } from '../../functions/Users/Commands/UserCommandDispatcher';
+import { UserExistsQuery } from '../../functions/Users/Queries/UserQuery';
+
+export async function checkUserExists(
+  req: Request, 
+  res: Response, 
+  queryDispatcher: UserQueryDispatcher, 
+  commandDispatcher: UserCommandDispatcher
+): Promise<void> {
+  try {
+    if(!req.user || !req.user.id) {
+      res.status(401).json({
+        success: false,
+        message: 'Unauthorized access - user not authenticated'
+      });
+      return;
+    }
+    const id = req.user.id.toString();
+    const query = new UserExistsQuery(parseInt(id));
+    const exists = await queryDispatcher.dispatch(query);
+
+    res.status(200).json({
+      success: true,
+      exists
+    });
+  } catch (error: any) {
+    res.status(500).json({
+      success: false,
+      message: error.message || 'Failed to check user existence'
+    });
+  }
+}