i will try to explain my problem clearly.
I have an API who writes something in DynamoDB with a lambda function written in Node.js. When i'm calling it within the AWS console, the API works as expected. I send a body like that:
{
"user-id":"4dz545zd",
"name":"Bush",
"firstname":"Gerard",
}
And that creates the entry within my dynamoDB table. But when i call the same API (freshly deployed) with Postman, i get this error:
{
"statusCode": "400",
"body": "One or more parameter values were invalid: An AttributeValue may not contain an empty string",
"headers": {
"Content-Type": "application/json"
}
}
When i check in cloudwatch why it fails, i see: Method request body before transformations: [Binary Data]
This is weird, because i sent JSON with the two headers:
Content-Type:application/json
Accept:application/json
And then in cloudwatch, i see that being processed is:
{
"user-id":"",
"name":"",
"firstname":"",
}
Thats explains the error, but i don't understand why when i'm sending it with postman, being not empty, with the json format, it still sends it as "binary" data, and so not being processed by my mapping rule (And so lambda processing it with an empty json):
#set($inputRoot = $input.path('$'))
{
"httpMethod": "POST",
"body": {
"TableName": "user",
"Item": {
"user-id":"$inputRoot.get('user-id')",
"name":"$inputRoot.get('name')",
"firstname":"$inputRoot.get('firstname')",
}
}
}
Thank you in advance !
EDIT: I'm adding the lambda code function
'use strict';
console.log('Function Prep');
const doc = require('dynamodb-doc');
const dynamo = new doc.DynamoDB();
exports.handler = (event, context, callback) => {
const done = (err, res) => callback(null, {
statusCode: err ? '400' : '200',
body: err ? err.message : res,
headers: {
'Content-Type': 'application/json'
},
});
switch (event.httpMethod) {
case 'DELETE':
dynamo.deleteItem(event.body, done);
break;
case 'HEAD':
dynamo.getItem(event.body, done);
break;
case 'GET':
if (event.queryStringParameters !== undefined) {
dynamo.scan({ TableName: event.queryStringParameters.TableName }, done);
}
else {
dynamo.getItem(event.body, done);
}
break;
case 'POST':
dynamo.putItem(event.body, done);
break;
case 'PUT':
dynamo.putItem(event.body, done);
break;
default:
done(new Error(`Unsupported method "${event.httpMethod}"`));
}
};
