问使用云函数进行修复操作安全吗？

EN

CollectionReference users = FirebaseFirestore.instance.collection('users');

Future<void> addUser() {
  // Call the user's CollectionReference to add a new user
  return users
      .add({
        'full_name': fullName, // John Doe
        'company': company, // Stokes and Sons
        'age': age // 42
      })
      .then((value) => print("User Added"))
      .catchError((error) => print("Failed to add user: $error"));
}

exports.createUser = functions.https.onCall(async (data, context) => {
  const uid = context?.auth?.uid
  if (!uid) {
    return {result: 0, message: 'You are not authorized.'}
  }

  const username = data.user
  const email = data.email  
  var result: number 
  var message: string 

  //Check to see if that username already exists
  const doesUserExist = await TS_doesUserExist(username)
  const createUser = await TS_createUser(uid, username, email)

  if (doesUserExist[0] == 0) {
    if (createUser[0] == 1) {
      result = 1
      message = ''
    } else {
      result = 0
      message = createUser[1]
    }
  } else {
    result = 0
    message = doesUserExist[1]
  }

  return {result: result, message: message}

})

async function TS_createUser(uid: string, username: string, email: string): Promise<[number, string]> {
  var result: number = 0
  var message: string = ''

  //Create SECURE_userinfo doc
  const userInfoDoc = await admin.firestore()
                        .collection(usersCollPath)
                        .doc(uid)  // use uid as document ID
                        .collection(secureUserInfoCollPath)
                        .doc()
                        .set({
                          createDate: admin.firestore.FieldValue.serverTimestamp(), //signupdate
                          email: email,
                        })

  //Create stat doc  
  const statDoc = await admin.firestore()
                  .collection(usersCollPath)
                  .doc(uid)
                  .collection(statCollPath)
                  .doc()
                  .set({
                    stat: 1,
                  })

  //Create username doc
  const usernameDoc = await admin.firestore()
                      .collection(usersCollPath)
                      .doc(uid)
                      .collection(usernameCollPath)
                      .doc()
                      .set({
                        username: username,
                      })

  if (userInfoDoc) {
    if (statDoc) {
      if (usernameDoc) {
        result = 1
        message = ''
      } else {
        result = 0
        message = 'Could not create username doc'
      }
    } else {
      result = 0
      message = 'Could not create status doc'
    }
  } else {
    result = 0
    message = 'Could not create user info doc'
  }  

  return [result, message]
}