//go:build e2e
// +build e2e

/*
Copyright 2019 The Knative Authors

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 runtime

import (
	"testing"

	corev1 "k8s.io/api/core/v1"
	"knative.dev/serving/test"

	. "knative.dev/serving/pkg/testing/v1"
)

const (
	securityContextUserID = 2020
	unprivilegedUserID    = 65532
)

// TestMustRunAsUser verifies that a supplied runAsUser through securityContext takes
// effect as declared by "MUST" in the runtime-contract.
func TestMustRunAsUser(t *testing.T) {
	if test.ServingFlags.DisableOptionalAPI {
		t.Skip("Container.securityContext is not required by Knative Serving API Specification")
	}

	t.Parallel()
	clients := test.Setup(t)

	runAsUser := int64(securityContextUserID)
	securityContext := &corev1.SecurityContext{
		RunAsUser: &runAsUser,
	}

	// We need to modify the working dir because the specified user cannot access the
	// default user's working dir.
	_, ri, err := fetchRuntimeInfo(t, clients, WithSecurityContext(securityContext), WithWorkingDir("/"))
	if err != nil {
		t.Fatal("Error fetching runtime info:", err)
	}

	if ri.Host == nil {
		t.Fatal("Missing host information from runtime info.")
	}

	if ri.Host.User == nil {
		t.Fatal("Missing user information from runtime info.")
	}

	if got, want := ri.Host.User.UID, securityContextUserID; got != want {
		t.Errorf("uid = %d, want: %d", got, want)
	}

	// We expect the effective userID to match the userID as we
	// did not use setuid.
	if got, want := ri.Host.User.EUID, securityContextUserID; got != want {
		t.Errorf("euid = %d, want: %d", got, want)
	}
}

// TestShouldRunAsUserContainerDefault verifies that a container that sets runAsUser
// in the Dockerfile is respected when executed in Knative as declared by "SHOULD"
// in the runtime-contract.
func TestShouldRunAsUserContainerDefault(t *testing.T) {
	if test.ServingFlags.DisableOptionalAPI {
		t.Skip("Container.securityContext is not required by Knative Serving API Specification")
	}

	t.Parallel()
	clients := test.Setup(t)
	_, ri, err := fetchRuntimeInfo(t, clients)

	if err != nil {
		t.Fatal("Error fetching runtime info:", err)
	}

	if ri.Host == nil {
		t.Fatal("Missing host information from runtime info.")
	}

	if ri.Host.User == nil {
		t.Fatal("Missing user information from runtime info.")
	}

	if got, want := ri.Host.User.UID, unprivilegedUserID; got != want {
		t.Errorf("uid = %d, want: %d", got, want)
	}

	// We expect the effective userID to match the userID as we
	// did not use setuid.
	if got, want := ri.Host.User.EUID, unprivilegedUserID; got != want {
		t.Errorf("euid = %d, want: %d", got, want)
	}

}
