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// Package recaptcha interacts with the reCaptcha verification API
package recaptcha
import (
"errors"
"net/http"
"net/url"
"encoding/json"
)
const (
verifyURL = "https://www.google.com/recaptcha/api/siteverify"
)
var (
ErrSecretMissing = errors.New("The secret parameter is missing.")
ErrSecretInvalid = errors.New("The secret parameter is invalid or malformed.")
ErrResponseMissing = errors.New("The response parameter is missing.")
ErrResponseInvalid = errors.New("The response parameter is invalid or malformed.")
)
type Response struct {
Success bool `json:"success"`
// Errors from reCaptcha service
ErrorCodes []string `json:"error-codes"`
// Our errors to caller
Errors []error `json:"-"`
}
// Translate error code into error
func (r *Response) getErrorFromCode(code string) error {
switch code {
case "missing-input-secret":
return ErrSecretMissing
case "invalid-input-secret":
return ErrSecretInvalid
case "missing-input-response":
return ErrResponseMissing
case "invalid-input-response":
return ErrResponseInvalid
default:
return nil
}
}
// Translate reCaptcha error codes into errors
func (r *Response) populateErrors() {
for _, code := range r.ErrorCodes {
r.Errors = append(r.Errors, r.getErrorFromCode(code))
}
}
// Public verfication function
// It requires the reCaptcha secret, the response from the widget.
// It returns the reCaptcha response as a struct.
func Verify(secret string, response string, remoteip string) (*Response, error) {
values := make(url.Values)
values.Set("secret", secret)
values.Set("response", response)
values.Set("remoteip", remoteip)
resp, err := http.PostForm(verifyURL, values)
if err != nil {
return nil, err
}
defer resp.Body.Close()
// Collect the response into struct
recaptchaResponse := new(Response)
err = json.NewDecoder(resp.Body).Decode(recaptchaResponse); if err != nil {
return nil, err
}
recaptchaResponse.populateErrors()
return recaptchaResponse, nil
}
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