overleaf-registration-be/recaptcha.go

package main

import (
	"bytes"
	"encoding/json"
	"errors"
	"net/http"
	"os"
)

func validateRecaptcha(token string) (bool, error) {
	secret := os.Getenv("CAPTCHA_SERVER_KEY")
	if secret == "" {
		return false, errors.New("missing CAPTCHA_SERVER_KEY")
	}

	url := "https://www.google.com/recaptcha/api/siteverify"
	payload := map[string]string{
		"secret":   secret,
		"response": token,
	}
	jsonPayload, _ := json.Marshal(payload)

	resp, err := http.Post(url, "application/json", bytes.NewBuffer(jsonPayload))
	if err != nil {
		return false, err
	}
	defer resp.Body.Close()

	var result map[string]interface{}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return false, err
	}

	success, ok := result["success"].(bool)
	if !ok {
		return false, errors.New("invalid reCAPTCHA response format")
	}

	return success, nil
}