Lambda function URLs How to Read Body from Post?

[jeffotoni]

Describe the issue

Ex:
curl -i -XPOST -H "Content-Type: application/json" https://xxxxxxx.lambda-url.us-east-1.on.aws -d '{"input":"ping"}'

type Event struct {
	Input string `json:"input"`
}

func HandleRequest(event Event) (*Response, error) {
	if len(event.Input) > 0 && event.Input == "ping" {
		return &Response{Msg: "pong"}, nil
	}
	return &Response{Msg: "I don't know"}, nil
}

How to read the body coming from a Post ?

Because the example above didn't work for the curl Payload but for the event it works 100%.

Links

https://docs.aws.amazon.com/lambda/latest/dg/lambda-urls.html
https://docs.aws.amazon.com/lambda/latest/dg/lambda-golang.html

[Jonniedev]

https://github.com/aws/aws-lambda-go/blob/main/events/README_Lambda.md

[RanVaknin]

Hi @jeffotoni when making a curl request directly you need to unmarshal the body from event before you can access your input.

package main

import (
	"context"
	"encoding/json"
	"fmt"

	"github.com/aws/aws-lambda-go/lambda"
)

type Body struct {
	Input string `json:"input"`
}

type Event struct {
	Body string `json:"body"`
}

type Response struct {
	StatusCode int    `json:"statusCode"`
	Body       string `json:"body"`
}

func HandleRequest(ctx context.Context, event Event) (Response, error) {
	var body Body

	err := json.Unmarshal([]byte(event.Body), &body)
	if err != nil {
		return Response{StatusCode: 400, Body: `{"msg": "error ready body, Invalid JSON"}`}, err
	}

	if body.Input == "ping" {
		return Response{StatusCode: 200, Body: `{"msg": "pong"}`}, nil
	}
	return Response{StatusCode: 200, Body: `{"msg": "I don't know"}`}, nil
}

func main() {
	lambda.Start(HandleRequest)
}

$ curl -i -XPOST -H "Content-Type: application/json" https://xxxxxxx.lambda-url.us-east-1.on.aws/ -d '{"input":"ping"}'

HTTP/1.1 200 OK
Date: Wed, 19 Jul 2023 00:06:57 GMT
Content-Type: application/json
Content-Length: 15
Connection: keep-alive
x-amzn-RequestId: REDACTED
X-Amzn-Trace-Id: REDACTED

{"msg": "pong"}%    

Hope this helps,
Thanks,
Ran~

[jeffotoni]

I'm going to test it here but it turned out pretty simple lol 😁

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