K8s: Refactor config/options for aggregation (#81739)

pkg/services/apiserver/auth/authorizer/stack_id.go

@@ -0,0 +1,56 @@
+package authorizer
+
+import (
+	"context"
+	"fmt"
+
+	"k8s.io/apiserver/pkg/authorization/authorizer"
+
+	"github.com/grafana/grafana/pkg/infra/appcontext"
+	"github.com/grafana/grafana/pkg/infra/log"
+	grafanarequest "github.com/grafana/grafana/pkg/services/apiserver/endpoints/request"
+	"github.com/grafana/grafana/pkg/setting"
+)
+
+var _ authorizer.Authorizer = &stackIDAuthorizer{}
+
+type stackIDAuthorizer struct {
+	log     log.Logger
+	stackID string
+}
+
+func newStackIDAuthorizer(cfg *setting.Cfg) *stackIDAuthorizer {
+	return &stackIDAuthorizer{
+		log:     log.New("grafana-apiserver.authorizer.stackid"),
+		stackID: cfg.StackID, // this lets a single tenant grafana validate stack id (rather than orgs)
+	}
+}
+
+func (auth stackIDAuthorizer) Authorize(ctx context.Context, a authorizer.Attributes) (authorized authorizer.Decision, reason string, err error) {
+	signedInUser, err := appcontext.User(ctx)
+	if err != nil {
+		return authorizer.DecisionDeny, fmt.Sprintf("error getting signed in user: %v", err), nil
+	}
+
+	info, err := grafanarequest.ParseNamespace(a.GetNamespace())
+	if err != nil {
+		return authorizer.DecisionDeny, fmt.Sprintf("error reading namespace: %v", err), nil
+	}
+
+	// No opinion when the namespace is arbitrary
+	if info.OrgID == -1 {
+		return authorizer.DecisionNoOpinion, "", nil
+	}
+
+	if info.StackID != auth.stackID {
+		return authorizer.DecisionDeny, "wrong stack id is selected", nil
+	}
+	if info.OrgID != 1 {
+		return authorizer.DecisionDeny, "cloud instance requires org 1", nil
+	}
+	if signedInUser.OrgID != 1 {
+		return authorizer.DecisionDeny, "user must be in org 1", nil
+	}
+
+	return authorizer.DecisionNoOpinion, "", nil
+}