Add license restrictions

Signed-off-by: Tamal Saha <[email protected]>

apis/config/v1alpha1/license_constraints_types.go

@@ -0,0 +1,25 @@
+/*
+Copyright AppsCode Inc. and Contributors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1alpha1
+
+type LicenseConstraints map[string]Restrictions
+
+type Restrictions struct {
+	Constraint string `json:"constraint"`
+	// +optional
+	Distributions []string `json:"distributions,omitempty"`
+}

pkg/controller/controller.go

@@ -19,6 +19,7 @@ package controller
 import (
 	"time"
 
+	configapi "kubedb.dev/apimachinery/apis/config/v1alpha1"
 	cs "kubedb.dev/apimachinery/client/clientset/versioned"
 	kubedbinformers "kubedb.dev/apimachinery/client/informers/externalversions"
 
@@ -88,6 +89,7 @@ type Config struct {
 
 	// Only watch or reconcile objects in this namespace (usually for license reasons)
 	RestrictToNamespace    string
+	LicenseConstraints     *configapi.LicenseConstraints
 	ResyncPeriod           time.Duration
 	ReadinessProbeInterval time.Duration
 	MaxNumRequeues         int

pkg/license/lib.go

@@ -0,0 +1,83 @@
+/*
+Copyright AppsCode Inc. and Contributors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package license
+
+import (
+	"context"
+
+	catalogapi "kubedb.dev/apimachinery/apis/catalog/v1alpha1"
+	configapi "kubedb.dev/apimachinery/apis/config/v1alpha1"
+
+	"github.com/Masterminds/semver/v3"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+func MeetsLicenseConstraints(kc client.Client, constraints configapi.LicenseConstraints, dbGK schema.GroupKind, dbVersion string) (bool, error) {
+	if len(constraints) == 0 {
+		return true, nil
+	}
+	restriction, found := constraints[dbGK.Kind]
+	if !found {
+		return false, nil
+	}
+
+	var dbv unstructured.Unstructured
+	dbv.SetGroupVersionKind(catalogapi.SchemeGroupVersion.WithKind(dbGK.Kind + "Version"))
+	err := kc.Get(context.TODO(), client.ObjectKey{Name: dbVersion}, &dbv)
+	if err != nil {
+		return false, err
+	}
+
+	strVer, ok, err := unstructured.NestedString(dbv.UnstructuredContent(), "spec", "version")
+	if err != nil || !ok {
+		return false, err
+	}
+	v, err := semver.NewVersion(strVer)
+	if err != nil {
+		return false, err
+	}
+
+	c, err := semver.NewConstraint(restriction.Constraint)
+	if err != nil {
+		return false, err
+	}
+	if !c.Check(v) {
+		// write reason ?
+		return false, nil
+	}
+	if len(restriction.Distributions) > 0 {
+		strDistro, ok, err := unstructured.NestedString(dbv.UnstructuredContent(), "spec", "distribution")
+		if err != nil || !ok {
+			return false, err
+		}
+		if !contains(restriction.Distributions, strDistro) {
+			return false, nil
+		}
+	}
+	return true, nil
+}
+
+func contains(list []string, str string) bool {
+	for _, v := range list {
+		if v == str {
+			return true
+		}
+	}
+	return false
+}