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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package auth
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"strings"
)
type TokenResponse struct {
AccessToken string `json:"access_token"`
IDToken string `json:"id_token"`
TokenType string `json:"token_type"`
ExpiresIn int `json:"expires_in"`
}
type TokenRetriever struct {
Authenticator *Authenticator
Secrets SecretStore
Client *http.Client
}
// Delete deletes the given system from the secrets' storage.
func (t *TokenRetriever) Delete(system string) error {
return t.Secrets.Delete(SecretsNamespace, system)
}
// Refresh gets a new access token from the provided refresh token,
// The request is used the default client_id and endpoint for device authentication.
func (t *TokenRetriever) Refresh(ctx context.Context, system string) (TokenResponse, error) {
// get stored refresh token:
refreshToken, err := t.Secrets.Get(SecretsNamespace, system)
if err != nil {
return TokenResponse{}, fmt.Errorf("cannot get the stored refresh token: %w", err)
}
if refreshToken == "" {
return TokenResponse{}, errors.New("cannot use the stored refresh token: the token is empty")
}
// get access token:
r, err := t.Client.PostForm(t.Authenticator.OauthTokenEndpoint, url.Values{
"grant_type": {"refresh_token"},
"client_id": {t.Authenticator.ClientID},
"refresh_token": {refreshToken},
})
if err != nil {
return TokenResponse{}, fmt.Errorf("cannot get a new access token from the refresh token: %w", err)
}
defer r.Body.Close()
if r.StatusCode != http.StatusOK {
b, _ := io.ReadAll(r.Body)
res := struct {
Description string `json:"error_description"`
}{}
if json.Unmarshal(b, &res) == nil {
return TokenResponse{}, errors.New(strings.ToLower(strings.TrimSuffix(res.Description, ".")))
}
return TokenResponse{}, fmt.Errorf("cannot get a new access token from the refresh token: %s", string(b))
}
var res TokenResponse
err = json.NewDecoder(r.Body).Decode(&res)
if err != nil {
return TokenResponse{}, fmt.Errorf("cannot decode response: %w", err)
}
return res, nil
}
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