Develop Reference

Received invalid response from Lambda: Unrecognized field

i am working on Amazon lex. when i give input to amazon lex its gives me following error
i add lambda function in Fulfillment and from lambda i am getting customer information from MySQL Database
here is my lambda function
const mysql = require('mysql');
var pool = mysql.createPool({ // a connection pool is a cache of database connections maintained so that the connections can be reused when future requests to the database are required
host: process.env.RDS_HOSTNAME,
user: process.env.RDS_USERNAME,
password: process.env.RDS_PASSWORD,
port: process.env.RDS_PORT,
database: process.env.RDS_DATABASE
});
exports.handler = (event, context, callback) => {
let MembershipNumber = event.currentIntent.slots.MembershipNumber;
// allows for using callbacks as finish/error-handlers
context.callbackWaitsForEmptyEventLoop = false;
pool.getConnection(function(err, connection) {
if (err) throw err;
let sql = "select * from Sales.CustomerTable where MembershipNumber= ? LIMIT 1";
let field = [MembershipNumber];
connection.query(sql,field, function (err, result, fields) {
if (err) {
console.log(err); // an error occurred
context.fail(buildResponse(false));
}
else {
if (result.length === 1) {
//console.log(data.Items[0].Arrival_city);
var FirstName = result[0].FirstName;
var LastName = result[0].LastName;
var Address = result[0].Address;
var PrimaryPhone = result[0].PrimaryPhone;
var SecondaryPhone = result[0].SecondaryPhone;
var Email = result[0].Email;
var Type = result[0].Type;
var MembershipNumber = result[0].MembershipNumber;
var Pin = result[0].Pin;
callback(null, {
"dialogAction": {
"type": "ConfirmIntent",
"fulfillmentState": "Fulfilled",
"message": {
"contentType": "PlainText",
"content": FirstName,LastName,Address,PrimaryPhone,SecondaryPhone,Email,Type,MembershipNumber,Pin
}
}
});
}
else {
console.log("Membership Number not found");
callback(null, buildResponse(true, "none"));
}
}
});
});
};
function buildResponse(isSuccess, FirstName, LastName, Address, PrimaryPhone, SecondaryPhone, Email, Type, MembershipNumber, Pin) {
if (isSuccess) {
return {
FirstName: FirstName,
LastName: LastName,
Address: Address,
PrimaryPhone: PrimaryPhone,
SecondaryPhone: SecondaryPhone,
Email:Email,
Type:Type,
MembershipNumber:MembershipNumber,
Pin:Pin,
lambdaResult: "success"
};
}
else {
console.log("Lambda returned error to Connect");
return { lambdaResult: "Error" };
}
}
here is the test event object
{
"messageVersion": "1.0",
"invocationSource": "FulfillmentCodeHook",
"userId": "user-1",
"sessionAttributes": {},
"bot": {
"name": "Sales",
"alias": "sales",
"version": "$LATEST"
},
"outputDialogMode": "Text",
"currentIntent": {
"name": "iamamember",
"slots": {
"MembershipNumber": "78541258"
},
"confirmationStatus": "None"
}
}
i want to integrate this with my contact flow. i don't what is this error about. If anyone of you know help me. Thanks

From the error message, the response JSON from lambda is not matching with what Lex expects. As per the error message, it appears that this line has the problem:
"content": FirstName,LastName,Address,PrimaryPhone,SecondaryPhone,Email,Type,MembershipNumber,Pin
The value of content needs to be a string. However, from your screenshot, this is getting resolved as "content": "alys", "Lastname",...
I believe what you want to do is a concatenation of FirstName, LastName and all the other things you want to return in the content. Use a correct function that will do concatenation of these fields and then put them as comma-separated.
Reference: https://docs.aws.amazon.com/lex/latest/dg/lambda-input-response-format.html

How to fix "Error: Can't set headers after they are sent" in Express

I have recently been developing a MERN application and I have recently came into the trouble that express is saying that I am setting headers after they are sent.
I am using mongo db and trying to update a user profile.
I have tried to comment out my res.send points to find the issue but I have failed to do so.
Here is my post method for updating the user profile:
app.post("/api/account/update", (req, res) => {
const { body } = req;
// Validating and Checking Email
if (body.email) {
var email = body.email;
email = email.toLowerCase();
email = email.trim();
body.email = email;
User.find(
{
email: body.email
},
(err, previousUsers) => {
if (previousUsers.length > 0) {
return res.send({
success: false,
message:
"Error: There is already another account with that email address"
});
} else {
}
}
);
}
// Validating Names Function
function checkName(name) {
var alphaExp = /^[a-zA-Z]+$/;
if (!name.match(alphaExp)) {
return res.send({
success: false,
message: "Error: Names cannot contain special characters or numbers"
});
}
}
checkName(body.firstName);
checkName(body.lastName);
// Making sure that all fields cannot be empty
if (!body.email && !body.firstName && !body.lastName) {
return res.send({
success: false,
message: "Error: You cannot submit nothing"
});
}
// Getting User ID from the current session
UserSession.findById(body.tokenID, function(err, userData) {
// Finding User ID using the current users session token
if (userData.isDeleted) {
return res.send({
success: false,
message:
"Error: Session token is no longer valid, please login to recieve a new one"
});
}
// Deleting the token ID from the body object as user table entry doesnt store tokens
delete body.tokenID;
// Finding the user profile and updating fields that are present
User.findByIdAndUpdate(userData.userId, body, function(err, userInfo) {
if (!err) {
return res.send({
success: true,
message: "Success: User was updated successfully"
});
}
});
});
});
This is the call that I am doing to the backend of the site:
onUpdateProfile: function(fieldsObj) {
return new Promise(function(resolve, reject) {
// Get Session Token
const obj = getFromStorage("the_main_app");
// Defining what fields are getting updated
fieldsObj.tokenID = obj.token;
// Post request to backend
fetch("/api/account/update", {
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify(fieldsObj)
})
.then(res => {
console.log("Verify Token - Res");
return res.json();
})
.then(json => {
console.log("Verify Token JSON", json);
if (json.success) {
window.location.href = `/manage-account?success=${json.success}`;
} else {
window.location.href = `/manage-account?success=${json.success}`;
}
});
});
}
Here is my error message that I am getting:
Error: Can't set headers after they are sent.
at validateHeader (_http_outgoing.js:491:11)
at ServerResponse.setHeader (_http_outgoing.js:498:3)
at ServerResponse.header (C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\node_modules\express\lib\response.js:767:10)
at ServerResponse.send (C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\node_modules\express\lib\response.js:170:12)
at ServerResponse.json (C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\node_modules\express\lib\response.js:267:15)
at ServerResponse.send (C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\node_modules\express\lib\response.js:158:21)
at C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\routes\api\account.js:270:22
at C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\node_modules\mongoose\lib\model.js:4641:16
at process.nextTick (C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\node_modules\mongoose\lib\query.js:2624:28)
at _combinedTickCallback (internal/process/next_tick.js:131:7)
at process._tickCallback (internal/process/next_tick.js:180:9)
[nodemon] app crashed - waiting for file changes before starting...
Can anyone help me with this?
EDIT
I have changed my code, this seems to now work however I feel like its a little messy when put together. Any refactoring tips?
Code:
app.post("/api/account/update", (req, res) => {
// Preform checks on data that is passed through
const { body } = req;
var messages = {
ExistedUser:
"Error: There is already another account with that email address",
NameFormat: "Error: Names cannot contain special characters or numbers",
BlankInputs: "Error: You cannot submit nothing",
accountLoggedOut:
"Error: Session token is no longer valid, please login to recieve a new one",
successfullyUpdated: "Success: User was updated successfully"
};
var usersFound;
if (body.email) {
var email = body.email;
email = email.toLowerCase();
email = email.trim();
body.email = email;
User.find(
{
email: body.email
},
(err, UserCount) => {
usersFound = UserCount;
}
);
}
function capitalize(text) {
return text.replace(/\b\w/g, function(m) {
return m.toUpperCase();
});
}
if (body.firstName) {
body.firstName = capitalize(body.firstName);
}
if (body.lastName) {
body.lastName = capitalize(body.lastName);
}
//Making sure that all fields cannot be empty
if (!body.email && !body.firstName && !body.lastName) {
return res.send({
success: false,
message: messages.BlankInputs
});
}
// Getting User ID from the current session
UserSession.findById(body.tokenID, function(err, userData) {
// Finding User ID using the current users session token
if (userData.isDeleted) {
return res.end({
success: false,
message: messages.accountLoggedOut
});
}
if (userData) {
// Deleting the token ID from the body object as user table entry doesnt store tokens
delete body.tokenID;
// Finding the user profile and updating fields that are present
User.findByIdAndUpdate(userData.userId, body, function(err, userInfo) {
if (userInfo) {
if (!usersFound.length > 0) {
return res.send({
success: true,
message: messages.successfullyUpdated
});
} else {
return res.send({
success: false,
message: messages.ExistedUser
});
}
}
});
}
});
});

You're calling res.send() twice. res.send() ends the process. You ought to refactor such that you call res.write() and only call res.send() when you're done.
This StackOverflow link describes the difference in more detail. What is the difference between res.send and res.write in express?

I believe this is happening, as you're trying to send a response after the first / initial response has already been sent to the browser. For example:
checkName(body.firstName);
checkName(body.lastName);
Running this function twice is going to try and yield 2 different "response" messages.
The product of a single route, should ultimately be a single response.

Thanks for all your help on this issue.
Here is my final code that allowed it to work.
I have also tried to "refactor" it too. Let me know if you'd do something else.
app.post("/api/account/update", (req, res) => {
const { body } = req;
console.log(body, "Logged body");
// Defining objects to be used at the end of request
var updateUserInfo = {
userInfo: {},
sessionToken: body.tokenID
};
var hasErrors = {
errors: {}
};
// Checking that there is at least one value to update
if (!body.email && !body.firstName && !body.lastName) {
var blankError = {
success: false,
message: "Error: You cannot change your details to nothing"
};
hasErrors.errors = { ...hasErrors.errors, ...blankError };
} else {
console.log("Normal Body", body);
clean(body);
console.log("Cleaned Body", body);
updateUserInfo.userInfo = body;
delete updateUserInfo.userInfo.tokenID;
}
// Function to check if object is empty
function isEmpty(obj) {
if (Object.keys(obj).length === 0) {
return true;
} else {
return false;
}
}
// Function to remove objects from body if blank
function clean(obj) {
for (var propName in obj) {
if (obj[propName] === "" || obj[propName] === null) {
delete obj[propName];
}
}
}
// Checking and Formatting Names Given
function capitalize(text) {
return text.replace(/\b\w/g, function(m) {
return m.toUpperCase();
});
}
if (body.firstName) {
body.firstName = capitalize(body.firstName);
}
if (body.lastName) {
body.lastName = capitalize(body.lastName);
}
// Checking and formatting email
if (body.email) {
body.email = body.email.toLowerCase();
body.email = body.email.trim();
// Checking for email in database
User.find({ email: body.email }, (err, EmailsFound) => {
if (EmailsFound.length > 0) {
var EmailsFoundErr = {
success: false,
message: "There is already an account with that email address"
};
hasErrors.errors = { ...hasErrors.errors, ...EmailsFoundErr };
}
});
}
// Getting User Session Token
UserSession.findById(updateUserInfo.sessionToken, function(err, userData) {
// Finding User ID using the current users session token
if (userData.isDeleted) {
var userDeletedError = {
success: false,
message:
"Your account is currently logged out, you must login to change account details"
};
hasErrors.errors = { ...hasErrors.errors, ...userDeletedError };
} else {
// Finding the user profile and updating fields that are present
User.findByIdAndUpdate(
userData.userId,
updateUserInfo.userInfo,
function(err, userInfo) {
// userInfo varable contains user db entry
if (err) {
var updateUserError = {
success: false,
message: "Error: Server Error"
};
hasErrors.errors = {
...hasErrors.errors,
...updateUserError
};
}
if (isEmpty(hasErrors.errors)) {
res.send({
success: true,
message: "Success: You have updated your profile!"
});
} else {
res.send({
success: false,
message: hasErrors.errors
});
}
}
);
}
});
});

How to check if there's no errors in authentication process in Firebase Web?

I'm new to Web Development, especially to Firebase.
I'm trying to check if there are no errors while creating a user in Firebase Authentication system, so I can put this user into Database.
Here's my code:
function register() {
var firebaseRef = firebase.database().ref();
var shaObj = new jsSHA("SHA-256", "TEXT")
shaObj.update(passwordField.value)
//console.log(hash)
var email = emailField.value
var password = shaObj.getHash("HEX")
if (isBarber != null) {
if (email != "" && password != "") {
firebase.auth().createUserWithEmailAndPassword(email, password).catch(function(error) {
$('#errorMsg').show();
$('#errorMsg').text(error.message);
if (error === null) {
var user = firebase.auth().currentUser;
var userID = user.uid;
firebase.database().ref('users/' + userID).set({
userEmail: email,
userPassword: password,
userIsBarber: isBarber
})
}
});
} else {
alert('Email or password fields are empty')
}
} else {
alert('Select your role')
}
}
createUserWithEmailAndPassword works properly and creates a user, but I don't know how to check if there are no errors so I could add this user to database.
Thanks a lot

You can use then() to action on a successful registration as follows:
firebase.auth().createUserWithEmailAndPassword(email, password).then(function(user) {
//Registration is successful
var user = firebase.auth().currentUser;
var userID = user.uid;
firebase.database().ref('users/' + userID).set({
userEmail: email,
userPassword: password,
userIsBarber: isBarber
})
}).catch(error) {
//Registration unsuccessful
$('#errorMsg').show();
$('#errorMsg').text(error.message);
});

Firebase Database Rules read problems

I have problems with read permission.
It will be helpfull if someone help me.
Note: the authentification work the user is loged...
Write permissions work but read permissions are denied.
I have this code:
{
"rules": {
"user":{
"$uid":{
".read": "auth.uid==$uid", // i try with ===
".write": "auth.uid==$uid" // i try with ===
}
}
}
}
This is the javascript code:
var userRef= db.ref().child("user/"+id);
userRef.on('child_added', data=>{
console.log(data.val());
});
userRef.on('child_changed', data=>{
console.log(data.val());
});
userRef.on('child_removed', data=>{
console.log(data.val());
});
function insertUser(){
db.ref("user/"+id).set({
email:email,
name:name
});
}
I also try with:
This make me a error on JavaScript
var userRef= db.ref("user").child(id);
I put ".read": true, but nothing happen yet!
I get the id in that way:
firebase.auth().onAuthStateChanged(
function(user){
if (user) {
if (user != null) {
user.providerData.forEach(function (profile) {
name = profile.displayName;
email = profile.email;
photoUrl = profile.photoURL;
id=user.uid;
var img = document.querySelector('#simg');
var p = document.querySelector('#p');
img.src=photoUrl;
p.innerHTML=name;
pemail.innerHTML=email;
});
}
}
Thanks!

Firebase Writing with Security Rules

I have a Node app with a Firebase db with security like this :
{
"rules": {
".read": true,
"albums": {
".write": "auth != null",
}
}
}
I login like this:
var firebaseTokenGenerator = require('firebase-token-generator'),
firebase = require('firebase');
var tokenGenerator = new firebaseTokenGenerator('my key');
var token = tokenGenerator.createToken();
var albumRef = new firebase('https://glowing-fire-8113.firebaseio.com/albums');
albumRef.auth(token, function(err) {
if(err) {
console.log("Authentication failed!");
} else {
console.log("Login succeeded!");
}
});
I get "Login succeeded!" printed to the console.
Then, later on I call this function:
var addAlbum = function(album, callback) {
if(album["album"] && album["artist"] && album["image"]) {
albumRef.push().set(album);
callback(null);
}
callback(new Error("Album JSON was missing some items"));
};
But, I get this printed out:
FIREBASE WARNING: set at /albums/-JMU95j8W4Vz3kchhNzL failed: permission_denied
What is going on here? Am I doing authentication incorrectly?
For reference, I'm using
"firebase" : "1.0.14",
"firebase-token-generator" : "0.1.4",