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package auth
import (
"fmt"
"net/http"
"golang.org/x/oauth2"
)
// Provider is an abstraction of different auth methods.
type Provider interface {
Name() string
StartSession(string, *http.Request) *Session
Exchange(string) (*oauth2.Token, error)
Username(*oauth2.Token) string
Valid(*oauth2.Token) bool
Revoke(*oauth2.Token) error
}
// Session stores authentication state.
type Session struct {
AuthURL string
Token *oauth2.Token
}
// Authorize obtains data from the provider and retains an access token that
// can be stored for later access.
func (s *Session) Authorize(provider Provider, code string) error {
t, err := provider.Exchange(code)
if err != nil {
return err
}
s.Token = t
return nil
}
// Oauth2RedirectURL returns an OAuth redirect_uri for this request.
func Oauth2RedirectURL(r *http.Request) string {
protocol := "http"
if r.TLS != nil {
protocol = "https"
}
return fmt.Sprintf("%s://%s/auth/callback", protocol, r.Host)
}
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