overleaf-registration-be/recaptcha.go

package main

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

func validateRecaptcha(captchaToken string) (bool, error) {
	secret := os.Getenv("CAPTCHA_SERVER_KEY")
	if secret == "" {
		return false, fmt.Errorf("CAPTCHA_SERVER_KEY is not set")
	}

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

	resp, err := http.Post(url, "application/json", bytes.NewBuffer(payloadBytes))
	if err != nil {
		return false, fmt.Errorf("reCAPTCHA API request failed: %v", err)
	}
	defer resp.Body.Close()

	var result map[string]interface{}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return false, fmt.Errorf("failed to parse reCAPTCHA API response: %v", err)
	}

	success, ok := result["success"].(bool)
	if !ok || !success {
		if errors, exists := result["error-codes"]; exists {
			fmt.Printf("reCAPTCHA error codes: %+v\n", errors)
		}
		return false, fmt.Errorf("reCAPTCHA validation failed")
	}

	return true, nil
}