add join game auth logic

backend/serverless/Lambda/joingame.js

@@ -32,18 +32,37 @@ exports.handler = async (event, context, callback) => {
         const commandEnv = new GetItemCommand(dynamoDBParamsEnv);
         const responseEnv = await client.send(commandEnv);
 
+        const users = responseEnv.Item.users.L;
+        var found = false
+        for (let i = 0; i < users.length; i++) {
+            let value = users[i]["S"];
+            if (value == email) {
+                found = true;
+                break;
+            }
+
+        }
+        if (found == false) {
+            return {
+                statusCode: 500,
+                body: JSON.stringify('user not in game')
+            };
+            }
+        else{
+
        const command = new GetItemCommand(dynamoDBParams);
        const response = await client.send(command);
+       const anchorid = response.Item.anchorid.S;
 
 
         // Return a response
         return {
             statusCode: 200,
-            body: JSON.stringify('arcore anchor stored success.')
+            body: anchorid
         };
 
 
-
+    }
     //error handleing
     } catch (error) {
         console.error('Error:', error);