mirror of
https://github.com/steveiliop56/tinyauth.git
synced 2025-12-27 02:22:27 +00:00
117 lines
2.6 KiB
Go
117 lines
2.6 KiB
Go
package service
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import (
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"context"
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"crypto/rand"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"strings"
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"time"
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"github.com/steveiliop56/tinyauth/internal/config"
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"golang.org/x/oauth2"
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"golang.org/x/oauth2/endpoints"
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)
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var GoogleOAuthScopes = []string{"openid", "email", "profile"}
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type GoogleOAuthService struct {
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config oauth2.Config
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context context.Context
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token *oauth2.Token
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verifier string
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name string
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}
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func NewGoogleOAuthService(config config.OAuthServiceConfig) *GoogleOAuthService {
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return &GoogleOAuthService{
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config: oauth2.Config{
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ClientID: config.ClientID,
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ClientSecret: config.ClientSecret,
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RedirectURL: config.RedirectURL,
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Scopes: GoogleOAuthScopes,
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Endpoint: endpoints.Google,
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},
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name: config.Name,
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}
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}
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func (google *GoogleOAuthService) Init() error {
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httpClient := &http.Client{
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Timeout: 30 * time.Second,
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}
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ctx := context.Background()
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ctx = context.WithValue(ctx, oauth2.HTTPClient, httpClient)
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google.context = ctx
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return nil
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}
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func (oauth *GoogleOAuthService) GenerateState() string {
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b := make([]byte, 128)
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_, err := rand.Read(b)
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if err != nil {
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return base64.RawURLEncoding.EncodeToString(fmt.Appendf(nil, "state-%d", time.Now().UnixNano()))
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}
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state := base64.RawURLEncoding.EncodeToString(b)
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return state
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}
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func (google *GoogleOAuthService) GenerateVerifier() string {
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verifier := oauth2.GenerateVerifier()
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google.verifier = verifier
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return verifier
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}
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func (google *GoogleOAuthService) GetAuthURL(state string) string {
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return google.config.AuthCodeURL(state, oauth2.AccessTypeOffline, oauth2.S256ChallengeOption(google.verifier))
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}
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func (google *GoogleOAuthService) VerifyCode(code string) error {
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token, err := google.config.Exchange(google.context, code, oauth2.VerifierOption(google.verifier))
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if err != nil {
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return err
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}
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google.token = token
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return nil
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}
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func (google *GoogleOAuthService) Userinfo() (config.Claims, error) {
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var user config.Claims
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client := google.config.Client(google.context, google.token)
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res, err := client.Get("https://openidconnect.googleapis.com/v1/userinfo")
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if err != nil {
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return config.Claims{}, err
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}
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defer res.Body.Close()
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if res.StatusCode < 200 || res.StatusCode >= 300 {
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return user, fmt.Errorf("request failed with status: %s", res.Status)
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}
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body, err := io.ReadAll(res.Body)
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if err != nil {
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return config.Claims{}, err
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}
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err = json.Unmarshal(body, &user)
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if err != nil {
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return config.Claims{}, err
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}
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user.PreferredUsername = strings.SplitN(user.Email, "@", 2)[0]
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return user, nil
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}
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func (google *GoogleOAuthService) GetName() string {
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return google.name
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}
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