feat: extract auth into provider (#663)

* extract auth into provider

* bump go version

* use pointer

* rebase

backend/app/api/providers/local.go

@@ -0,0 +1,30 @@
+package providers
+
+import (
+	"net/http"
+
+	"github.com/hay-kot/homebox/backend/internal/core/services"
+)
+
+type LocalProvider struct {
+	service *services.UserService
+}
+
+func NewLocalProvider(service *services.UserService) *LocalProvider {
+	return &LocalProvider{
+		service: service,
+	}
+}
+
+func (p *LocalProvider) Name() string {
+	return "local"
+}
+
+func (p *LocalProvider) Authenticate(w http.ResponseWriter, r *http.Request) (services.UserAuthTokenDetail, error) {
+	loginForm, err := getLoginForm(r)
+	if err != nil {
+		return services.UserAuthTokenDetail{}, err
+	}
+
+	return p.service.Login(r.Context(), loginForm.Username, loginForm.Password, loginForm.StayLoggedIn)
+}