Serverless framework on AWS - Post API gives Internal server error - amazon-web-services

Question

My serverless.yml looks like this -
service: books-api-v1
provider:
name: aws
region: eu-west-1
role: arn:aws:iam::298945683355:role/lambda-vpc-role
runtime: nodejs8.10
iamRoleStatements:
- Effect: Allow
Action:
- "ec2:CreateNetworkInterface"
- "ec2:DescribeNetworkInterfaces"
- "ec2:DeleteNetworkInterface"
Resource: "*"
functions:
login:
handler: api/controllers/authController.authenticate
vpc: ${self:custom.vpc}
events:
- http:
path: /v1/users/login
method: post
cors: true
And the actual API function looks this -
'use strict';
var db = require('../../config/db'),
crypt = require('../../helper/crypt.js'),
jwt = require('jsonwebtoken');
exports.authenticate = function(event, context, callback) {
console.log(JSON.parse(event.body));
const data = IsJsonString(event.body) ? JSON.parse(event.body) : event.body;
let myEmailBuff = new Buffer(process.env.EMAIL_ENCRYPTION_KEY);
db.users.find({
where:{
username : crypt.encrypt(data.username)
}
}).then(function(user) {
try {
let res = {
statusCode: 200,
headers: {
'Content-Type': 'application/json',
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Credentials': true,
},
body: JSON.stringify({
message:'ERROR!',
success: false
})
};
if (!user) {
res.body = JSON.stringify({
success: false,
message: 'Authentication failed. User not found.',
authFail:true
});
//res.status(200).json({ success: false, message: 'Authentication failed. User not found.',authFail:true, });
}else if (user) {
// check if password matches
if (crypt.decrypt(user.password) != data.password) {
res.body = JSON.stringify({
success: false,
message: 'Authentication failed. Wrong password.',
authFail:true
});
//res.status(200).json({ success: false, message: 'Authentication failed. Wrong password.',authFail:true, });
} else {
// if user is found and password is right
// create a token with only our given payload
// we don't want to pass in the entire user since that has the password
const payload = {
username: crypt.decrypt(user.username)
};
var token = jwt.sign(payload, process.env.JWT_SIGINING_KEY, {
algorithm: process.env.JWT_ALGORITHM,
expiresIn: 18000,
issuer: process.env.JWT_ISS
});
// return the information including token as JSON
// res.status(200).json({
// success: true,
// message: 'Enjoy your token!',
// token: token
// });
res.body = JSON.stringify({
success: true,
message: 'Enjoy your token!',
token: token
});
}
//callback(null, res);
}
console.log(res);
callback(null, res);
} catch (error) {
console.log('errorsssss: ');
console.log(error);
}
});
};
function IsJsonString(str) {
try {
JSON.parse(str);
} catch (e) {
return false;
}
return true;
}
Works very well on my serverless local, but when I try it on AWS Lambda function, then it gives "Internal server error" Message.
I have looked into my cloudwatch logs and the response looks correct to me. Here is the response that I am sending back to callback.
{
statusCode: 200,
headers: {
'Content-Type': 'application/json',
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Credentials': true
},
body: '{"success":true,"message":"Enjoy your token!","token":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VybmFtZSI6InNhaW1hLm5hc2lyckBnbWFpbC5jb20iLCJpYXQiOjE1NDUwNjE4OTYsImV4cCI6MTU0NTA3OTg5NiwiaXNzIjoiaWFtbm90YWdlZWsuY28udWsifQ.2HyA-wpmkrmbvrYlWOG41W-ezuLCNQnt0Tvrnsy2n3I"}'
}
Any help please?

Answer 1

In this case, it might because of the Api Gateway configurations. Does your api public? Because I have met such problems when the api is not public.