Authn: external identity sync (#73461)

* Authn: Add interface for external identity sync

This interface is implemented by authnimpl.Service and just triggers PostAuthHooks and skipping last seen update by default

* Authn: Add SyncIdentity to fake and add a new mock

pkg/services/authn/authntest/fake.go

@@ -7,6 +7,7 @@ import (
 )
 
 var _ authn.Service = new(FakeService)
+var _ authn.IdentitySynchronizer = new(FakeService)
 
 type FakeService struct {
 	ExpectedErr        error
@@ -67,6 +68,10 @@ func (f *FakeService) RedirectURL(ctx context.Context, client string, r *authn.R
 
 func (f *FakeService) RegisterClient(c authn.Client) {}
 
+func (f *FakeService) SyncIdentity(ctx context.Context, identity *authn.Identity) error {
+	return f.ExpectedErr
+}
+
 var _ authn.ContextAwareClient = new(FakeClient)
 
 type FakeClient struct {

pkg/services/authn/authntest/mock.go

@@ -6,6 +6,44 @@ import (
 	"github.com/grafana/grafana/pkg/services/authn"
 )
 
+var _ authn.Service = new(MockService)
+var _ authn.IdentitySynchronizer = new(MockService)
+
+type MockService struct {
+	SyncIdentityFunc func(ctx context.Context, identity *authn.Identity) error
+}
+
+func (m *MockService) Authenticate(ctx context.Context, r *authn.Request) (*authn.Identity, error) {
+	panic("unimplemented")
+}
+
+func (m *MockService) Login(ctx context.Context, client string, r *authn.Request) (*authn.Identity, error) {
+	panic("unimplemented")
+}
+
+func (m *MockService) RedirectURL(ctx context.Context, client string, r *authn.Request) (*authn.Redirect, error) {
+	panic("unimplemented")
+}
+
+func (m *MockService) RegisterClient(c authn.Client) {
+	panic("unimplemented")
+}
+
+func (m *MockService) RegisterPostAuthHook(hook authn.PostAuthHookFn, priority uint) {
+	panic("unimplemented")
+}
+
+func (m *MockService) RegisterPostLoginHook(hook authn.PostLoginHookFn, priority uint) {
+	panic("unimplemented")
+}
+
+func (m *MockService) SyncIdentity(ctx context.Context, identity *authn.Identity) error {
+	if m.SyncIdentityFunc != nil {
+		return m.SyncIdentityFunc(ctx, identity)
+	}
+	return nil
+}
+
 var _ authn.HookClient = new(MockClient)
 var _ authn.ContextAwareClient = new(MockClient)