feat: new openid connect authentication layer

internal/proxy/director/layer/authn/authenticator.go

@@ -0,0 +1,26 @@
+package authn
+
+import (
+	"net/http"
+
+	"forge.cadoles.com/cadoles/bouncer/internal/store"
+	"github.com/pkg/errors"
+)
+
+var (
+	ErrUnauthorized = errors.New("unauthorized")
+	ErrForbidden    = errors.New("forbidden")
+	ErrSkipRequest  = errors.New("skip request")
+)
+
+type Authenticator interface {
+	Authenticate(w http.ResponseWriter, r *http.Request, layer *store.Layer) (*User, error)
+}
+
+type PreAuthentication interface {
+	PreAuthentication(w http.ResponseWriter, r *http.Request, layer *store.Layer) error
+}
+
+type PostAuthentication interface {
+	PostAuthentication(w http.ResponseWriter, r *http.Request, layer *store.Layer, user *User) error
+}