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package mcaptcha
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"strings"
)
// VerifyOpts holds all the information that is need to make a verification request.
type VerifyOpts struct {
Secret string `json:"secret"`
Sitekey string `json:"key"` //nolint:tagliatelle // `Sitekey` is the correct naming, but API expects `key`.
Token string `json:"token"`
InstanceURL string `json:"-"`
}
// GetOpts returns a io.Reader that contains a JSON representation
// of the options.
func (opts *VerifyOpts) GetOpts() (io.Reader, error) {
if opts.Secret == "" {
return nil, ErrMissingSecret
}
if opts.Sitekey == "" {
return nil, ErrMissingSitekey
}
if opts.Token == "" {
return nil, ErrMissingToken
}
body, err := json.Marshal(opts)
if err != nil {
return nil, fmt.Errorf("couldn't marshal options: %w", err)
}
return bytes.NewReader(body), nil
}
type verifyResponse struct {
Valid bool `json:"valid"`
}
// Verify takes in a context and options to make a verification request.
// It will verify if the given token is validated on the given mCaptcha instance.
func Verify(ctx context.Context, opts *VerifyOpts) (bool, error) {
body, err := opts.GetOpts()
if err != nil {
return false, err
}
url := strings.TrimSuffix(opts.InstanceURL, "/")
req, err := http.NewRequestWithContext(ctx, "POST", url+"/api/v1/pow/siteverify", body)
if err != nil {
return false, fmt.Errorf("couldn't create a new request: %w", err)
}
req.Header.Set("Content-Type", "application/json")
res, err := http.DefaultClient.Do(req)
if err != nil {
return false, fmt.Errorf("couldn't execute request: %w", err)
}
defer res.Body.Close()
if res.StatusCode != 200 {
content, _ := io.ReadAll(res.Body)
return false, fmt.Errorf("mCaptcha didn't return 200 OK [content=%q]", string(content))
}
var responseStruct verifyResponse
err = json.NewDecoder(res.Body).Decode(&responseStruct)
if err != nil {
return false, fmt.Errorf("couldn't decode response from mCaptcha: %w", err)
}
return responseStruct.Valid, nil
}
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