/*
Copyright 2015 The Kubernetes 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 auth

import (
	"errors"
	"fmt"
	"os"
	"testing"
	"time"

	api "k8s.io/api/core/v1"
	networking "k8s.io/api/networking/v1"
	meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/client-go/tools/cache"
	"k8s.io/ingress-nginx/internal/ingress/annotations/parser"
	ing_errors "k8s.io/ingress-nginx/internal/ingress/errors"
	"k8s.io/ingress-nginx/internal/ingress/resolver"
)

//nolint:gosec // Ignore hardcoded credentials error in testing
const (
	authType          = "basic"
	authRealm         = "-realm-"
	defaultDemoSecret = "default/demo-secret"
	othernsDemoSecret = "otherns/demo-secret"
	demoSecret        = "demo-secret"
)

func buildIngress() *networking.Ingress {
	defaultBackend := networking.IngressBackend{
		Service: &networking.IngressServiceBackend{
			Name: "default-backend",
			Port: networking.ServiceBackendPort{
				Number: 80,
			},
		},
	}

	return &networking.Ingress{
		ObjectMeta: meta_v1.ObjectMeta{
			Name:      "foo",
			Namespace: api.NamespaceDefault,
		},
		Spec: networking.IngressSpec{
			DefaultBackend: &networking.IngressBackend{
				Service: &networking.IngressServiceBackend{
					Name: "default-backend",
					Port: networking.ServiceBackendPort{
						Number: 80,
					},
				},
			},
			Rules: []networking.IngressRule{
				{
					Host: "foo.bar.com",
					IngressRuleValue: networking.IngressRuleValue{
						HTTP: &networking.HTTPIngressRuleValue{
							Paths: []networking.HTTPIngressPath{
								{
									Path:    "/foo",
									Backend: defaultBackend,
								},
							},
						},
					},
				},
			},
		},
	}
}

type mockSecret struct {
	resolver.Mock
}

func (m mockSecret) GetSecret(name string) (*api.Secret, error) {
	if name != defaultDemoSecret && name != othernsDemoSecret {
		return nil, fmt.Errorf("there is no secret with name %v", name)
	}

	ns, _, err := cache.SplitMetaNamespaceKey(name)
	if err != nil {
		return nil, err
	}

	return &api.Secret{
		ObjectMeta: meta_v1.ObjectMeta{
			Namespace: ns,
			Name:      demoSecret,
		},
		Data: map[string][]byte{"auth": []byte("foo:$apr1$OFG3Xybp$ckL0FHDAkoXYIlH9.cysT0")},
	}, nil
}

func TestIngressWithoutAuth(t *testing.T) {
	ing := buildIngress()
	_, dir, _ := dummySecretContent(t)
	defer os.RemoveAll(dir)
	_, err := NewParser(dir, &mockSecret{}).Parse(ing)
	if err == nil {
		t.Error("Expected error with ingress without annotations")
	}
}

func TestIngressAuthBadAuthType(t *testing.T) {
	ing := buildIngress()

	data := map[string]string{}
	data[parser.GetAnnotationWithPrefix(authTypeAnnotation)] = "invalid"
	ing.SetAnnotations(data)

	_, dir, _ := dummySecretContent(t)
	defer os.RemoveAll(dir)

	expected := ing_errors.NewValidationError("nginx.ingress.kubernetes.io/auth-type")
	_, err := NewParser(dir, &mockSecret{}).Parse(ing)
	if err.Error() != expected.Error() {
		t.Errorf("expected '%v' but got '%v'", expected, err)
	}
}

func TestIngressInvalidRealm(t *testing.T) {
	ing := buildIngress()

	data := map[string]string{}
	data[parser.GetAnnotationWithPrefix(authTypeAnnotation)] = authType
	data[parser.GetAnnotationWithPrefix(authRealmAnnotation)] = "something weird ; location trying to { break }"
	data[parser.GetAnnotationWithPrefix(AuthSecretAnnotation)] = demoSecret
	ing.SetAnnotations(data)

	_, dir, _ := dummySecretContent(t)
	defer os.RemoveAll(dir)

	expected := ing_errors.NewValidationError("nginx.ingress.kubernetes.io/auth-realm")
	_, err := NewParser(dir, &mockSecret{}).Parse(ing)
	if err.Error() != expected.Error() {
		t.Errorf("expected '%v' but got '%v'", expected, err)
	}
}

func TestIngressInvalidDifferentNamespace(t *testing.T) {
	ing := buildIngress()

	data := map[string]string{}
	data[parser.GetAnnotationWithPrefix(authTypeAnnotation)] = authType
	data[parser.GetAnnotationWithPrefix(AuthSecretAnnotation)] = othernsDemoSecret
	ing.SetAnnotations(data)

	_, dir, _ := dummySecretContent(t)
	defer os.RemoveAll(dir)

	expected := ing_errors.LocationDeniedError{
		Reason: errors.New("cross namespace usage of secrets is not allowed"),
	}
	_, err := NewParser(dir, &mockSecret{}).Parse(ing)
	if err.Error() != expected.Error() {
		t.Errorf("expected '%v' but got '%v'", expected, err)
	}
}

func TestIngressInvalidDifferentNamespaceAllowed(t *testing.T) {
	ing := buildIngress()

	data := map[string]string{}
	data[parser.GetAnnotationWithPrefix(authTypeAnnotation)] = authType
	data[parser.GetAnnotationWithPrefix(AuthSecretAnnotation)] = othernsDemoSecret
	ing.SetAnnotations(data)

	_, dir, _ := dummySecretContent(t)
	defer os.RemoveAll(dir)

	r := mockSecret{}
	r.AllowCrossNamespace = true
	_, err := NewParser(dir, r).Parse(ing)
	if err != nil {
		t.Errorf("not expecting an error")
	}
}

func TestIngressInvalidSecretName(t *testing.T) {
	ing := buildIngress()

	data := map[string]string{}
	data[parser.GetAnnotationWithPrefix(authTypeAnnotation)] = authType
	data[parser.GetAnnotationWithPrefix(AuthSecretAnnotation)] = "demo-secret;xpto"
	ing.SetAnnotations(data)

	_, dir, _ := dummySecretContent(t)
	defer os.RemoveAll(dir)

	expected := ing_errors.LocationDeniedError{
		Reason: errors.New("error reading secret name from annotation: annotation nginx.ingress.kubernetes.io/auth-secret contains invalid value"),
	}
	_, err := NewParser(dir, &mockSecret{}).Parse(ing)
	if err.Error() != expected.Error() {
		t.Errorf("expected '%v' but got '%v'", expected, err)
	}
}

func TestInvalidIngressAuthNoSecret(t *testing.T) {
	ing := buildIngress()

	data := map[string]string{}
	data[parser.GetAnnotationWithPrefix(authTypeAnnotation)] = authType
	ing.SetAnnotations(data)

	_, dir, _ := dummySecretContent(t)
	defer os.RemoveAll(dir)

	expected := ing_errors.LocationDeniedError{
		Reason: errors.New("error reading secret name from annotation: ingress rule without annotations"),
	}
	_, err := NewParser(dir, &mockSecret{}).Parse(ing)
	if err.Error() != expected.Reason.Error() {
		t.Errorf("expected '%v' but got '%v'", expected, err)
	}
}

func TestIngressAuth(t *testing.T) {
	ing := buildIngress()

	data := map[string]string{}
	data[parser.GetAnnotationWithPrefix(authTypeAnnotation)] = authType
	data[parser.GetAnnotationWithPrefix(AuthSecretAnnotation)] = demoSecret
	data[parser.GetAnnotationWithPrefix(authRealmAnnotation)] = authRealm
	ing.SetAnnotations(data)

	_, dir, _ := dummySecretContent(t)
	defer os.RemoveAll(dir)

	i, err := NewParser(dir, &mockSecret{}).Parse(ing)
	if err != nil {
		t.Errorf("Unexpected error with ingress: %v", err)
	}
	auth, ok := i.(*Config)
	if !ok {
		t.Errorf("expected a BasicDigest type")
	}
	if auth.Type != authType {
		t.Errorf("Expected basic as auth type but returned %s", auth.Type)
	}
	if auth.Realm != authRealm {
		t.Errorf("Expected -realm- as realm but returned %s", auth.Realm)
	}
	if !auth.Secured {
		t.Errorf("Expected true as secured but returned %v", auth.Secured)
	}
}

func TestIngressAuthWithoutSecret(t *testing.T) {
	ing := buildIngress()

	data := map[string]string{}
	data[parser.GetAnnotationWithPrefix(authTypeAnnotation)] = authType
	data[parser.GetAnnotationWithPrefix(AuthSecretAnnotation)] = "invalid-secret"
	data[parser.GetAnnotationWithPrefix(authRealmAnnotation)] = authRealm
	ing.SetAnnotations(data)

	_, dir, _ := dummySecretContent(t)
	defer os.RemoveAll(dir)

	_, err := NewParser(dir, mockSecret{}).Parse(ing)
	if err == nil {
		t.Errorf("expected an error with invalid secret name")
	}
}

func TestIngressAuthInvalidSecretKey(t *testing.T) {
	ing := buildIngress()

	data := map[string]string{}
	data[parser.GetAnnotationWithPrefix(authTypeAnnotation)] = authType
	data[parser.GetAnnotationWithPrefix(AuthSecretAnnotation)] = demoSecret
	data[parser.GetAnnotationWithPrefix(authSecretTypeAnnotation)] = "invalid-type"
	data[parser.GetAnnotationWithPrefix(authRealmAnnotation)] = authRealm
	ing.SetAnnotations(data)

	_, dir, _ := dummySecretContent(t)
	defer os.RemoveAll(dir)

	_, err := NewParser(dir, mockSecret{}).Parse(ing)
	if err == nil {
		t.Errorf("expected an error with invalid secret name")
	}
}

func dummySecretContent(t *testing.T) (fileName, dir string, s *api.Secret) {
	dir, err := os.MkdirTemp("", fmt.Sprintf("%v", time.Now().Unix()))
	if err != nil {
		t.Error(err)
	}

	tmpfile, err := os.CreateTemp("", "example-")
	if err != nil {
		t.Error(err)
	}
	defer tmpfile.Close()
	s, err = mockSecret{}.GetSecret(defaultDemoSecret)
	if err != nil {
		t.Errorf("unexpected error: %v", err)
	}
	return tmpfile.Name(), dir, s
}

func TestDumpSecretAuthFile(t *testing.T) {
	tmpfile, dir, s := dummySecretContent(t)
	defer os.RemoveAll(dir)

	sd := s.Data
	s.Data = nil

	err := dumpSecretAuthFile(tmpfile, s)
	if err == nil {
		t.Errorf("Expected error with secret without auth")
	}

	s.Data = sd
	err = dumpSecretAuthFile(tmpfile, s)
	if err != nil {
		t.Errorf("Unexpected error creating htpasswd file %v: %v", tmpfile, err)
	}
}

func TestDumpSecretAuthMap(t *testing.T) {
	tmpfile, dir, s := dummySecretContent(t)
	defer os.RemoveAll(dir)

	err := dumpSecretAuthMap(tmpfile, s)
	if err != nil {
		t.Errorf("Unexpected error creating htpasswd file %v: %v", tmpfile, err)
	}
}