feat: v2alpha user service idp endpoints (#5879)

* feat: v2alpha user service idp endpoints

* feat: v2alpha user service intent endpoints

* begin idp intents (callback)

* some cleanup

* runnable idp authentication

* cleanup

* proto cleanup

* retrieve idp info

* improve success and failure handling

* some unit tests

* grpc unit tests

* add permission check AddUserIDPLink

* feat: v2alpha intent writemodel refactoring

* feat: v2alpha intent writemodel refactoring

* feat: v2alpha intent writemodel refactoring

* provider from write model

* fix idp type model and add integration tests

* proto cleanup

* fix integration test

* add missing import

* add more integration tests

* auth url test

* feat: v2alpha intent writemodel refactoring

* remove unused functions

* check token on RetrieveIdentityProviderInformation

* feat: v2alpha intent writemodel refactoring

* fix TestServer_RetrieveIdentityProviderInformation

* fix test

* i18n and linting

* feat: v2alpha intent review changes

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>
Co-authored-by: Tim Möhlmann <tim+github@zitadel.com>

internal/command/idp.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/zitadel/zitadel/internal/api/authz"
 	"github.com/zitadel/zitadel/internal/command/preparation"
+	"github.com/zitadel/zitadel/internal/errors"
 	"github.com/zitadel/zitadel/internal/repository/idp"
 )
 
@@ -139,3 +140,37 @@ func ExistsIDP(ctx context.Context, filter preparation.FilterToQueryReducer, id,
 	}
 	return instanceWriteModel.State.Exists(), nil
 }
+
+func IDPProviderWriteModel(ctx context.Context, filter preparation.FilterToQueryReducer, id string) (_ *AllIDPWriteModel, err error) {
+	writeModel := NewIDPTypeWriteModel(id)
+	events, err := filter(ctx, writeModel.Query())
+	if err != nil {
+		return nil, err
+	}
+	if len(events) == 0 {
+		return nil, errors.ThrowPreconditionFailed(nil, "COMMAND-as02jin", "Errors.IDPConfig.NotExisting")
+	}
+	writeModel.AppendEvents(events...)
+	if err := writeModel.Reduce(); err != nil {
+		return nil, err
+	}
+	allWriteModel, err := NewAllIDPWriteModel(
+		writeModel.ResourceOwner,
+		writeModel.ResourceOwner == writeModel.InstanceID,
+		writeModel.ID,
+		writeModel.Type,
+	)
+	if err != nil {
+		return nil, err
+	}
+	events, err = filter(ctx, allWriteModel.Query())
+	if err != nil {
+		return nil, err
+	}
+	allWriteModel.AppendEvents(events...)
+	if err := allWriteModel.Reduce(); err != nil {
+		return nil, err
+	}
+
+	return allWriteModel, err
+}