main.go

/*
Copyright 2020 The Kubermatic Kubernetes Platform 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 docs Kubermatic Kubernetes Platform API
//
// This OpenAPI 2.0 specification describes the REST APIs used by the Kubermatic Kubernetes Platform Dashboard.
//
// KKP API is an **internal API** that is built primarily to complement the KKP dashboard. Our users are strongly advised to use Kubernetes APIs i.e. [KKP CRDs](https://docs.kubermatic.com/kubermatic/v2.22/references/crds/) to interact with and integrate KKP into their own platforms.
//
// Since KKP API is **not a public API**, users can expect breaking changes without any formal announcements.
//
//	Schemes: https
//	Version: 2.23
//
//	Consumes:
//	- application/json
//
//	Produces:
//	- application/json
//
//	Security:
//	- api_key:
//
//	SecurityDefinitions:
//	api_key:
//	     type: apiKey
//	     name: Authorization
//	     in: header
//
// swagger:meta
package main

import (
	"bufio"
	"bytes"
	"context"
	"errors"
	"flag"
	"fmt"
	"io"
	"net"
	"net/http"
	"os"
	"time"

	"github.com/go-logr/zapr"
	"github.com/gorilla/handlers"
	"github.com/gorilla/mux"
	gatekeeperconfigv1alpha1 "github.com/open-policy-agent/gatekeeper/v3/apis/config/v1alpha1"
	prometheusapi "github.com/prometheus/client_golang/api"
	velerov1 "github.com/vmware-tanzu/velero/pkg/apis/velero/v1"
	"go.uber.org/zap"

	clusterv1alpha1 "github.com/kubermatic/machine-controller/pkg/apis/cluster/v1alpha1"
	"k8c.io/dashboard/v2/pkg/handler"
	"k8c.io/dashboard/v2/pkg/handler/auth"
	"k8c.io/dashboard/v2/pkg/handler/v1/common"
	v2 "k8c.io/dashboard/v2/pkg/handler/v2"
	"k8c.io/dashboard/v2/pkg/provider"
	auth2 "k8c.io/dashboard/v2/pkg/provider/auth"
	authtypes "k8c.io/dashboard/v2/pkg/provider/auth/types"
	kubernetesprovider "k8c.io/dashboard/v2/pkg/provider/kubernetes"
	"k8c.io/dashboard/v2/pkg/serviceaccount"
	kuberneteswatcher "k8c.io/dashboard/v2/pkg/watcher/kubernetes"
	kubermaticv1 "k8c.io/kubermatic/v2/pkg/apis/kubermatic/v1"
	"k8c.io/kubermatic/v2/pkg/cluster/client"
	"k8c.io/kubermatic/v2/pkg/controller/master-controller-manager/rbac"
	"k8c.io/kubermatic/v2/pkg/features"
	kubermaticlog "k8c.io/kubermatic/v2/pkg/log"
	metricspkg "k8c.io/kubermatic/v2/pkg/metrics"
	"k8c.io/kubermatic/v2/pkg/resources/certificates"
	"k8c.io/kubermatic/v2/pkg/util/cli"
	"k8c.io/kubermatic/v2/pkg/util/flagopts"
	osmv1alpha1 "k8c.io/operating-system-manager/pkg/crd/osm/v1alpha1"

	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/meta"
	"k8s.io/apimachinery/pkg/util/wait"
	"k8s.io/client-go/informers"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/kubernetes/scheme"
	"k8s.io/client-go/rest"
	"k8s.io/klog/v2"
	"k8s.io/metrics/pkg/apis/metrics/v1beta1"
	ctrlruntime "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/cache"
	ctrlruntimelog "sigs.k8s.io/controller-runtime/pkg/log"
	"sigs.k8s.io/controller-runtime/pkg/manager"
	"sigs.k8s.io/controller-runtime/pkg/manager/signals"
	metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"
)

func main() {
	klog.InitFlags(nil)
	pprofOpts := &flagopts.PProf{}
	pprofOpts.AddFlags(flag.CommandLine)
	options, err := newServerRunOptions()
	if err != nil {
		fmt.Printf("failed to create server run options: %v\n", err)
		os.Exit(1)
	}
	if err := options.validate(); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	rawLog := kubermaticlog.New(options.log.Debug, options.log.Format)
	log := rawLog.Sugar()
	kubermaticlog.Logger = log

	// Set the logger used by sigs.k8s.io/controller-runtime
	ctrlruntimelog.SetLogger(zapr.NewLogger(rawLog.WithOptions(zap.AddCallerSkip(1))))

	ctx := signals.SetupSignalHandler()
	cli.Hello(log, "API", options.log.Debug, &options.versions)

	if err := clusterv1alpha1.AddToScheme(scheme.Scheme); err != nil {
		log.Fatalw("failed to register scheme", zap.Stringer("api", clusterv1alpha1.SchemeGroupVersion), zap.Error(err))
	}
	if err := v1beta1.AddToScheme(scheme.Scheme); err != nil {
		log.Fatalw("failed to register scheme", zap.Stringer("api", v1beta1.SchemeGroupVersion), zap.Error(err))
	}
	if err := gatekeeperconfigv1alpha1.AddToScheme(scheme.Scheme); err != nil {
		log.Fatalw("failed to register scheme", zap.Stringer("api", gatekeeperconfigv1alpha1.GroupVersion), zap.Error(err))
	}
	if err := osmv1alpha1.AddToScheme(scheme.Scheme); err != nil {
		log.Fatalw("failed to register scheme", zap.Stringer("api", osmv1alpha1.SchemeGroupVersion), zap.Error(err))
	}

	if err := velerov1.AddToScheme(scheme.Scheme); err != nil {
		log.Fatalw("failed to register scheme", zap.Stringer("api", velerov1.SchemeGroupVersion), zap.Error(err))
	}
	masterCfg, err := ctrlruntime.GetConfig()
	if err != nil {
		log.Fatalw("unable to build client configuration from kubeconfig", zap.Error(err))
	}

	// We use the manager only to get a lister-backed ctrlruntimeclient.Client. We can not use it for most
	// other actions, because it doesn't support impersonation (and can't be changed to do that as that would mean it has to replicate the apiservers RBAC for the lister)
	mgr, err := manager.New(masterCfg, manager.Options{
		Cache: cache.Options{
			DefaultNamespaces: map[string]cache.Config{
				options.namespace: {},
			},
		},
		BaseContext: func() context.Context {
			return ctx
		},
		Metrics: metricsserver.Options{
			BindAddress: "0",
		},
		PprofBindAddress: pprofOpts.ListenAddress,
	})
	if err != nil {
		log.Fatalw("failed to construct manager", zap.Error(err))
	}
	if err := mgr.GetFieldIndexer().IndexField(ctx, &corev1.Event{}, common.EventFieldIndexerKey, common.EventIndexer()); err != nil {
		log.Fatalw("failed to add index on Event involvedObject name", zap.Error(err))
	}

	providers, err := createInitProviders(ctx, options, masterCfg, mgr, log)
	if err != nil {
		log.Fatalw("failed to create and initialize providers", zap.Error(err))
	}

	tokenVerifiers, tokenExtractors, err := createAuthClients(options, providers)
	if err != nil {
		log.Fatalw("failed to create auth clients", zap.Error(err))
	}
	apiHandler, err := createAPIHandler(options, providers, tokenVerifiers, tokenExtractors, mgr, log)
	if err != nil {
		log.Fatalw("failed to create API Handler", zap.Error(err))
	}

	go metricspkg.ServeForever(options.internalAddr, "/metrics")
	log.Infow("the API server listening", "listenAddress", options.listenAddress)

	handler := handlers.CustomLoggingHandler(os.Stdout, apiHandler, func(writer io.Writer, params handlers.LogFormatterParams) {
		// skip spamming the log with k8s health requests
		if params.URL.Path == "/api/v1/healthz" {
			return
		}

		log.
			With("method", params.Request.Method).
			With("uri", params.URL.Path).
			With("status", params.StatusCode).
			With("size", params.Size).
			With("userAgent", params.Request.Header.Get("User-Agent")).
			Debugw("request received")
	})

	if err := http.ListenAndServe(options.listenAddress, handler); err != nil {
		log.Fatalw("failed to start API server", zap.Error(err))
	}
}

func createInitProviders(ctx context.Context, options serverRunOptions, masterCfg *rest.Config, mgr manager.Manager, log *zap.SugaredLogger) (providers, error) {
	// create other providers
	kubeMasterClient := kubernetes.NewForConfigOrDie(masterCfg)
	kubeMasterInformerFactory := informers.NewSharedInformerFactory(kubeMasterClient, 30*time.Minute)

	client := mgr.GetClient()

	defaultImpersonationClient := kubernetesprovider.NewImpersonationClient(masterCfg, mgr.GetRESTMapper())

	seedsGetter, err := seedsGetterFactory(ctx, client, options)
	if err != nil {
		return providers{}, err
	}
	seedKubeconfigGetter, err := seedKubeconfigGetterFactory(ctx, client, options)
	if err != nil {
		return providers{}, err
	}

	var configGetter provider.KubermaticConfigurationGetter
	if options.kubermaticConfiguration != nil {
		configGetter, err = kubernetesprovider.StaticKubermaticConfigurationGetterFactory(options.kubermaticConfiguration)
	} else {
		configGetter, err = kubernetesprovider.DynamicKubermaticConfigurationGetterFactory(client, options.namespace)
	}
	if err != nil {
		return providers{}, err
	}

	// Make sure the manager creates a cache for Seeds by requesting an informer
	if _, err := mgr.GetCache().GetInformer(ctx, &kubermaticv1.Seed{}); err != nil {
		return providers{}, fmt.Errorf("failed to get seed informer: %w", err)
	}
	// mgr.Start() is blocking
	go func() {
		if err := mgr.Start(ctx); err != nil {
			log.Fatalw("failed to start the mgr", zap.Error(err))
		}
	}()
	mgrSyncCtx, cancel := context.WithTimeout(ctx, 30*time.Second)
	defer cancel()
	if synced := mgr.GetCache().WaitForCacheSync(mgrSyncCtx); !synced {
		return providers{}, errors.New("failed to sync mgr cache")
	}

	seedClientGetter := kubernetesprovider.SeedClientGetterFactory(seedKubeconfigGetter)
	clusterProviderGetter := clusterProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter, seedClientGetter, options)

	presetProvider, err := kubernetesprovider.NewPresetProvider(client)
	if err != nil {
		return providers{}, err
	}
	admissionPluginProvider := kubernetesprovider.NewAdmissionPluginsProvider(client)
	// Warm up the restMapper cache. Log but ignore errors encountered here, maybe there are stale seeds
	go func() {
		seeds, err := seedsGetter()
		if err != nil {
			log.Infow("failed to get seeds when trying to warm up restMapper cache", zap.Error(err))
			return
		}
		for _, seed := range seeds {
			if _, err := clusterProviderGetter(seed); err != nil {
				log.Infow("failed to get clusterProvider when trying to warm up restMapper cache", zap.Error(err), "seed", seed.Name)
			}
		}
	}()

	sshKeyProvider := kubernetesprovider.NewSSHKeyProvider(defaultImpersonationClient.CreateImpersonatedClient, client)
	privilegedSSHKeyProvider, err := kubernetesprovider.NewPrivilegedSSHKeyProvider(client)
	if err != nil {
		return providers{}, fmt.Errorf("failed to create privileged SSH key provider: %w", err)
	}
	userProvider := kubernetesprovider.NewUserProvider(client)
	settingsProvider := kubernetesprovider.NewSettingsProvider(client)
	addonConfigProvider := kubernetesprovider.NewAddonConfigProvider(client)
	adminProvider := kubernetesprovider.NewAdminProvider(client)
	resourceQuotaProvider := resourceQuotaProviderFactory(defaultImpersonationClient.CreateImpersonatedClient, client)
	groupProjectBindingProvider := groupProjectBindingFactory(defaultImpersonationClient.CreateImpersonatedClient, client)

	serviceAccountTokenProvider, err := kubernetesprovider.NewServiceAccountTokenProvider(defaultImpersonationClient.CreateImpersonatedClient, client)
	if err != nil {
		return providers{}, fmt.Errorf("failed to create service account token provider: %w", err)
	}

	serviceAccountProvider := kubernetesprovider.NewServiceAccountProvider(defaultImpersonationClient.CreateImpersonatedClient, client, options.domain)
	projectMemberProvider := kubernetesprovider.NewProjectMemberProvider(defaultImpersonationClient.CreateImpersonatedClient, client)
	projectProvider, err := kubernetesprovider.NewProjectProvider(defaultImpersonationClient.CreateImpersonatedClient, client)
	if err != nil {
		return providers{}, fmt.Errorf("failed to create project provider: %w", err)
	}

	privilegedProjectProvider, err := kubernetesprovider.NewPrivilegedProjectProvider(client)
	if err != nil {
		return providers{}, fmt.Errorf("failed to create privileged project provider: %w", err)
	}

	userInfoGetter, err := provider.UserInfoGetterFactory(projectMemberProvider)
	if err != nil {
		return providers{}, fmt.Errorf("failed to create user info getter: %w", err)
	}

	externalClusterProvider, err := kubernetesprovider.NewExternalClusterProvider(defaultImpersonationClient.CreateImpersonatedClient, mgr.GetClient())
	if err != nil {
		return providers{}, fmt.Errorf("failed to create external cluster provider: %w", err)
	}

	defaultConstraintProvider, err := kubernetesprovider.NewDefaultConstraintProvider(defaultImpersonationClient.CreateImpersonatedClient, mgr.GetClient(), options.namespace)
	if err != nil {
		return providers{}, fmt.Errorf("failed to create default constraint provider: %w", err)
	}

	constraintTemplateProvider, err := kubernetesprovider.NewConstraintTemplateProvider(defaultImpersonationClient.CreateImpersonatedClient, mgr.GetClient())
	if err != nil {
		return providers{}, fmt.Errorf("failed to create constraint template provider: %w", err)
	}

	clusterTemplateProvider, err := kubernetesprovider.NewClusterTemplateProvider(defaultImpersonationClient.CreateImpersonatedClient, client)
	if err != nil {
		return providers{}, fmt.Errorf("failed to create cluster template provider: %w", err)
	}

	privilegedAllowedRegistryProvider, err := kubernetesprovider.NewAllowedRegistryPrivilegedProvider(mgr.GetClient())
	if err != nil {
		return providers{}, fmt.Errorf("failed to create allowed registry provider: %w", err)
	}

	constraintProviderGetter := kubernetesprovider.ConstraintProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter)

	kubeMasterInformerFactory.Start(wait.NeverStop)
	kubeMasterInformerFactory.WaitForCacheSync(wait.NeverStop)

	eventRecorderProvider := kubernetesprovider.NewEventRecorder()

	addonProviderGetter := kubernetesprovider.AddonProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter, configGetter)

	alertmanagerProviderGetter := kubernetesprovider.AlertmanagerProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter)

	ruleGroupProviderGetter := kubernetesprovider.RuleGroupProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter)

	clusterTemplateInstanceProviderGetter := kubernetesprovider.ClusterTemplateInstanceProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter)

	etcdBackupConfigProviderGetter := kubernetesprovider.EtcdBackupConfigProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter)

	etcdRestoreProviderGetter := kubernetesprovider.EtcdRestoreProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter)

	etcdBackupConfigProjectProviderGetter := kubernetesprovider.EtcdBackupConfigProjectProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter)

	etcdRestoreProjectProviderGetter := kubernetesprovider.EtcdRestoreProjectProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter)

	backupCredentialsProviderGetter := kubernetesprovider.BackupCredentialsProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter)

	privilegedMLAAdminSettingProviderGetter := kubernetesprovider.PrivilegedMLAAdminSettingProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter)

	privilegedIPAMPoolProviderGetter := kubernetesprovider.PrivilegedIPAMPoolProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter)

	seedProvider := kubernetesprovider.NewSeedProvider(mgr.GetClient())

	applicationDefinitionProvider := kubernetesprovider.NewApplicationDefinitionProvider(client)

	privilegedOperatingSystemProfileProviderGetter := kubernetesprovider.PrivilegedOperatingSystemProfileProviderFactory(mgr.GetRESTMapper(), seedKubeconfigGetter)

	oidcIssuerVerifier, err := createOIDCClients(options.oidcIssuerConfiguration, options.oidcIssuerRedirectURI, options.caBundle)
	if err != nil {
		log.Fatalw("failed to create an openid authenticator", zap.Any("issuer", options.oidcURL), zap.Any("oidcClientID", options.oidcAuthenticatorClientID), zap.Error(err))
	}

	oidcIssuerVerifierProviderGetter := auth2.OIDCIssuerVerifierProviderFactory(
		oidcIssuerVerifier,
		options.oidcIssuerRedirectURI,
		options.caBundle,
	)

	userWatcher, err := kuberneteswatcher.NewUserWatcher(ctx, log)
	if err != nil {
		return providers{}, fmt.Errorf("failed to setup user-watcher: %w", err)
	}

	userInformer, err := mgr.GetCache().GetInformer(ctx, &kubermaticv1.User{})
	if err != nil {
		return providers{}, fmt.Errorf("failed to setup user informer: %w", err)
	}

	_, err = userInformer.AddEventHandler(userWatcher)
	if err != nil {
		return providers{}, fmt.Errorf("failed to setup event handler for user informer: %w", err)
	}

	settingsWatcher, err := kuberneteswatcher.NewSettingsWatcher(ctx, log)
	if err != nil {
		return providers{}, fmt.Errorf("failed to setup settings-watcher: %w", err)
	}

	settingsInformer, err := mgr.GetCache().GetInformer(ctx, &kubermaticv1.KubermaticSetting{})
	if err != nil {
		return providers{}, fmt.Errorf("failed to setup settings informer: %w", err)
	}

	_, err = settingsInformer.AddEventHandler(settingsWatcher)
	if err != nil {
		return providers{}, fmt.Errorf("failed to setup event handler for settings informer: %w", err)
	}

	featureGatesProvider := kubernetesprovider.NewFeatureGatesProvider(options.featureGates)

	backupStorageProvider := backupStorageProviderFactory(defaultImpersonationClient.CreateImpersonatedClient, client)

	return providers{
		sshKey:                                         sshKeyProvider,
		privilegedSSHKeyProvider:                       privilegedSSHKeyProvider,
		user:                                           userProvider,
		serviceAccountProvider:                         serviceAccountProvider,
		privilegedServiceAccountProvider:               serviceAccountProvider,
		serviceAccountTokenProvider:                    serviceAccountTokenProvider,
		privilegedServiceAccountTokenProvider:          serviceAccountTokenProvider,
		project:                                        projectProvider,
		privilegedProject:                              privilegedProjectProvider,
		projectMember:                                  projectMemberProvider,
		privilegedProjectMemberProvider:                projectMemberProvider,
		memberMapper:                                   projectMemberProvider,
		eventRecorderProvider:                          eventRecorderProvider,
		clusterProviderGetter:                          clusterProviderGetter,
		seedsGetter:                                    seedsGetter,
		seedClientGetter:                               seedClientGetter,
		configGetter:                                   configGetter,
		addons:                                         addonProviderGetter,
		addonConfigProvider:                            addonConfigProvider,
		userInfoGetter:                                 userInfoGetter,
		settingsProvider:                               settingsProvider,
		adminProvider:                                  adminProvider,
		presetProvider:                                 presetProvider,
		admissionPluginProvider:                        admissionPluginProvider,
		settingsWatcher:                                settingsWatcher,
		featureGatesProvider:                           featureGatesProvider,
		userWatcher:                                    userWatcher,
		externalClusterProvider:                        externalClusterProvider,
		privilegedExternalClusterProvider:              externalClusterProvider,
		constraintTemplateProvider:                     constraintTemplateProvider,
		defaultConstraintProvider:                      defaultConstraintProvider,
		constraintProviderGetter:                       constraintProviderGetter,
		alertmanagerProviderGetter:                     alertmanagerProviderGetter,
		clusterTemplateProvider:                        clusterTemplateProvider,
		ruleGroupProviderGetter:                        ruleGroupProviderGetter,
		clusterTemplateInstanceProviderGetter:          clusterTemplateInstanceProviderGetter,
		privilegedAllowedRegistryProvider:              privilegedAllowedRegistryProvider,
		etcdBackupConfigProviderGetter:                 etcdBackupConfigProviderGetter,
		etcdRestoreProviderGetter:                      etcdRestoreProviderGetter,
		etcdBackupConfigProjectProviderGetter:          etcdBackupConfigProjectProviderGetter,
		etcdRestoreProjectProviderGetter:               etcdRestoreProjectProviderGetter,
		backupStorageProvider:                          backupStorageProvider,
		backupCredentialsProviderGetter:                backupCredentialsProviderGetter,
		privilegedMLAAdminSettingProviderGetter:        privilegedMLAAdminSettingProviderGetter,
		seedProvider:                                   seedProvider,
		resourceQuotaProvider:                          resourceQuotaProvider,
		groupProjectBindingProvider:                    groupProjectBindingProvider,
		privilegedIPAMPoolProviderGetter:               privilegedIPAMPoolProviderGetter,
		applicationDefinitionProvider:                  applicationDefinitionProvider,
		privilegedOperatingSystemProfileProviderGetter: privilegedOperatingSystemProfileProviderGetter,
		oidcIssuerVerifierProviderGetter:               oidcIssuerVerifierProviderGetter,
	}, nil
}

func createOIDCClients(oidcIssuerConfiguration *authtypes.OIDCConfiguration, oidcIssuerRedirectURI string, caBundle *certificates.CABundle) (authtypes.OIDCIssuerVerifier, error) {
	return auth.NewOpenIDClient(
		oidcIssuerConfiguration,
		oidcIssuerRedirectURI,
		auth.NewCombinedExtractor(
			auth.NewHeaderBearerTokenExtractor("Authorization"),
			auth.NewQueryParamBearerTokenExtractor("token"),
		),
		caBundle.CertPool(),
	)
}

func createAuthClients(options serverRunOptions, prov providers) (authtypes.TokenVerifier, authtypes.TokenExtractor, error) {
	oidcExtractorVerifier, err := auth.NewOpenIDClient(
		options.oidcAuthenticatorConfiguration,
		"",
		auth.NewCombinedExtractor(
			auth.NewHeaderBearerTokenExtractor("Authorization"),
			auth.NewCookieHeaderBearerTokenExtractor("token"),
			auth.NewQueryParamBearerTokenExtractor("token"),
		),
		options.caBundle.CertPool(),
	)

	if err != nil {
		return nil, nil, fmt.Errorf("failed to create OIDC Authenticator: %w", err)
	}

	jwtExtractorVerifier := auth.NewServiceAccountAuthClient(
		auth.NewHeaderBearerTokenExtractor("Authorization"),
		serviceaccount.JWTTokenAuthenticator([]byte(options.serviceAccountSigningKey)),
		prov.privilegedServiceAccountTokenProvider,
	)

	tokenVerifiers := auth.NewTokenVerifierPlugins([]authtypes.TokenVerifier{oidcExtractorVerifier, jwtExtractorVerifier})
	tokenExtractors := auth.NewTokenExtractorPlugins([]authtypes.TokenExtractor{oidcExtractorVerifier, jwtExtractorVerifier})
	return tokenVerifiers, tokenExtractors, nil
}

func createAPIHandler(
	options serverRunOptions, prov providers,
	tokenVerifiers authtypes.TokenVerifier,
	tokenExtractors authtypes.TokenExtractor,
	mgr manager.Manager,
	log *zap.SugaredLogger,
) (http.HandlerFunc, error) {
	var prometheusClient prometheusapi.Client
	if options.featureGates.Enabled(features.PrometheusEndpoint) {
		var err error
		if prometheusClient, err = prometheusapi.NewClient(prometheusapi.Config{
			Address: options.prometheusURL,
		}); err != nil {
			return nil, err
		}
	}

	serviceAccountTokenGenerator, err := serviceaccount.JWTTokenGenerator([]byte(options.serviceAccountSigningKey))
	if err != nil {
		return nil, fmt.Errorf("failed to create service account token generator: %w", err)
	}
	serviceAccountTokenAuth := serviceaccount.JWTTokenAuthenticator([]byte(options.serviceAccountSigningKey))

	routingParams := handler.RoutingParams{
		Log:                                            kubermaticlog.New(options.log.Debug, options.log.Format).Sugar(),
		PresetProvider:                                 prov.presetProvider,
		SeedsGetter:                                    prov.seedsGetter,
		SeedsClientGetter:                              prov.seedClientGetter,
		KubermaticConfigurationGetter:                  prov.configGetter,
		SSHKeyProvider:                                 prov.sshKey,
		PrivilegedSSHKeyProvider:                       prov.privilegedSSHKeyProvider,
		UserProvider:                                   prov.user,
		ServiceAccountProvider:                         prov.serviceAccountProvider,
		PrivilegedServiceAccountProvider:               prov.privilegedServiceAccountProvider,
		ServiceAccountTokenProvider:                    prov.serviceAccountTokenProvider,
		PrivilegedServiceAccountTokenProvider:          prov.privilegedServiceAccountTokenProvider,
		ProjectProvider:                                prov.project,
		PrivilegedProjectProvider:                      prov.privilegedProject,
		TokenVerifiers:                                 tokenVerifiers,
		TokenExtractors:                                tokenExtractors,
		ClusterProviderGetter:                          prov.clusterProviderGetter,
		AddonProviderGetter:                            prov.addons,
		AddonConfigProvider:                            prov.addonConfigProvider,
		PrometheusClient:                               prometheusClient,
		ProjectMemberProvider:                          prov.projectMember,
		PrivilegedProjectMemberProvider:                prov.privilegedProjectMemberProvider,
		UserProjectMapper:                              prov.memberMapper,
		SATokenAuthenticator:                           serviceAccountTokenAuth,
		SATokenGenerator:                               serviceAccountTokenGenerator,
		EventRecorderProvider:                          prov.eventRecorderProvider,
		ExposeStrategy:                                 options.exposeStrategy,
		UserInfoGetter:                                 prov.userInfoGetter,
		SettingsProvider:                               prov.settingsProvider,
		AdminProvider:                                  prov.adminProvider,
		AdmissionPluginProvider:                        prov.admissionPluginProvider,
		SettingsWatcher:                                prov.settingsWatcher,
		UserWatcher:                                    prov.userWatcher,
		ExternalClusterProvider:                        prov.externalClusterProvider,
		PrivilegedExternalClusterProvider:              prov.privilegedExternalClusterProvider,
		FeatureGatesProvider:                           prov.featureGatesProvider,
		DefaultConstraintProvider:                      prov.defaultConstraintProvider,
		ConstraintTemplateProvider:                     prov.constraintTemplateProvider,
		ConstraintProviderGetter:                       prov.constraintProviderGetter,
		AlertmanagerProviderGetter:                     prov.alertmanagerProviderGetter,
		ClusterTemplateProvider:                        prov.clusterTemplateProvider,
		ClusterTemplateInstanceProviderGetter:          prov.clusterTemplateInstanceProviderGetter,
		RuleGroupProviderGetter:                        prov.ruleGroupProviderGetter,
		PrivilegedAllowedRegistryProvider:              prov.privilegedAllowedRegistryProvider,
		EtcdBackupConfigProviderGetter:                 prov.etcdBackupConfigProviderGetter,
		EtcdRestoreProviderGetter:                      prov.etcdRestoreProviderGetter,
		EtcdBackupConfigProjectProviderGetter:          prov.etcdBackupConfigProjectProviderGetter,
		EtcdRestoreProjectProviderGetter:               prov.etcdRestoreProjectProviderGetter,
		BackupStorageProvider:                          prov.backupStorageProvider,
		BackupCredentialsProviderGetter:                prov.backupCredentialsProviderGetter,
		PrivilegedMLAAdminSettingProviderGetter:        prov.privilegedMLAAdminSettingProviderGetter,
		SeedProvider:                                   prov.seedProvider,
		ResourceQuotaProvider:                          prov.resourceQuotaProvider,
		GroupProjectBindingProvider:                    prov.groupProjectBindingProvider,
		PrivilegedIPAMPoolProviderGetter:               prov.privilegedIPAMPoolProviderGetter,
		ApplicationDefinitionProvider:                  prov.applicationDefinitionProvider,
		PrivilegedOperatingSystemProfileProviderGetter: prov.privilegedOperatingSystemProfileProviderGetter,
		OIDCIssuerVerifierProviderGetter:               prov.oidcIssuerVerifierProviderGetter,
		Versions:                                       options.versions,
		CABundle:                                       options.caBundle.CertPool(),
		Features:                                       options.featureGates,
	}

	r := handler.NewRouting(routingParams, mgr.GetClient())
	rv2 := v2.NewV2Routing(routingParams)

	registerMetrics()

	mainRouter := mux.NewRouter()
	mainRouter.Use(setSecureHeaders)

	if options.log.Debug {
		mainRouter.Use(func(next http.Handler) http.Handler {
			return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				dummyWriter := newResponseLogger(w)
				next.ServeHTTP(dummyWriter, r)

				log.Debugw("response", "body", dummyWriter.buf.String(), "status", dummyWriter.statusCode, "uri", r.RequestURI)
			})
		})
	}
	v1Router := mainRouter.PathPrefix("/api/v1").Subrouter()
	v2Router := mainRouter.PathPrefix("/api/v2").Subrouter()
	r.RegisterV1(v1Router, metrics)
	r.RegisterV1Optional(v1Router, options.featureGates.Enabled(features.OIDCKubeCfgEndpoint))
	r.RegisterV1Admin(v1Router)
	r.RegisterV1Websocket(v1Router)
	rv2.RegisterV2(v2Router, options.featureGates.Enabled(features.OIDCKubeCfgEndpoint))

	mainRouter.Methods(http.MethodGet).
		Path("/api/swagger.json").
		HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			http.ServeFile(w, r, options.swaggerFile)
		})

	lookupRoute := func(r *http.Request) string {
		var match mux.RouteMatch
		ok := mainRouter.Match(r, &match)
		if !ok {
			return ""
		}

		name := match.Route.GetName()
		if name != "" {
			return name
		}

		name, err := match.Route.GetPathTemplate()
		if err != nil {
			return ""
		}

		return name
	}

	return instrumentHandler(mainRouter, lookupRoute), nil
}

func setSecureHeaders(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// ContentSecurityPolicy sets the `Content-Security-Policy` header providing
		// security against cross-site scripting (XSS), clickjacking and other code
		// injection attacks resulting from execution of malicious content in the
		// trusted web page context. Reference: https://w3c.github.io/webappsec-csp/
		w.Header().Set("Content-Security-Policy", "default-src 'self'; script-src 'self'; object-src 'self'; style-src 'self'; img-src 'self'; media-src 'self'; frame-ancestors 'self'; frame-src 'self'; connect-src 'self'")
		// XFrameOptions can be used to indicate whether or not a browser should
		// be allowed to render a page in a <frame>, <iframe> or <object> .
		// Sites can use this to avoid clickjacking attacks, by ensuring that their
		// content is not embedded into other sites.provides protection against
		// clickjacking.
		// Optional. Default value "SAMEORIGIN".
		// Possible values:
		// - "SAMEORIGIN" - The page can only be displayed in a frame on the same origin as the page itself.
		// - "DENY" - The page cannot be displayed in a frame, regardless of the site attempting to do so.
		// - "ALLOW-FROM uri" - The page can only be displayed in a frame on the specified origin.
		w.Header().Set("X-Frame-Options", "DENY")
		// XSSProtection provides protection against cross-site scripting attack (XSS)
		// by setting the `X-XSS-Protection` header.
		// Optional. Default value "1; mode=block".
		w.Header().Set("X-XSS-Protection", "1; mode=block")
		// ContentTypeNosniff provides protection against overriding Content-Type
		// header by setting the `X-Content-Type-Options` header.
		// Optional. Default value "nosniff".
		w.Header().Set("X-Content-Type-Options", "nosniff")
		next.ServeHTTP(w, r)
	})
}

func clusterProviderFactory(mapper meta.RESTMapper, seedKubeconfigGetter provider.SeedKubeconfigGetter, seedClientGetter provider.SeedClientGetter, options serverRunOptions) provider.ClusterProviderGetter {
	return func(seed *kubermaticv1.Seed) (provider.ClusterProvider, error) {
		cfg, err := seedKubeconfigGetter(seed)
		if err != nil {
			return nil, err
		}
		kubeClient, err := kubernetes.NewForConfig(cfg)
		if err != nil {
			return nil, fmt.Errorf("failed to create kubeClient: %w", err)
		}
		defaultImpersonationClientForSeed := kubernetesprovider.NewImpersonationClient(cfg, mapper)

		seedCtrlruntimeClient, err := seedClientGetter(seed)
		if err != nil {
			return nil, fmt.Errorf("failed to create dynamic seed client: %w", err)
		}

		userClusterConnectionProvider, err := client.NewExternal(seedCtrlruntimeClient)
		if err != nil {
			return nil, fmt.Errorf("failed to get userClusterConnectionProvider: %w", err)
		}

		return kubernetesprovider.NewClusterProvider(
			cfg,
			defaultImpersonationClientForSeed.CreateImpersonatedClient,
			userClusterConnectionProvider,
			options.workerName,
			rbac.ExtractGroupPrefix,
			seedCtrlruntimeClient,
			kubeClient,
			options.featureGates.Enabled(features.OIDCKubeCfgEndpoint),
			options.versions,
			seed,
		), nil
	}
}

type responseLogger struct {
	buf            bytes.Buffer
	statusCode     int
	ResponseWriter http.ResponseWriter
}

var _ http.ResponseWriter = &responseLogger{}

func newResponseLogger(upstream http.ResponseWriter) *responseLogger {
	return &responseLogger{
		ResponseWriter: upstream,
	}
}

func (rl *responseLogger) Header() http.Header {
	return rl.ResponseWriter.Header()
}

func (rl *responseLogger) Write(data []byte) (int, error) {
	rl.buf.Write(data)
	return rl.ResponseWriter.Write(data)
}

func (rl *responseLogger) WriteHeader(statusCode int) {
	rl.statusCode = statusCode
	rl.ResponseWriter.WriteHeader(statusCode)
}

func (rl *responseLogger) Hijack() (net.Conn, *bufio.ReadWriter, error) {
	h, ok := rl.ResponseWriter.(http.Hijacker)
	if !ok {
		return nil, nil, errors.New("hijack not supported")
	}

	return h.Hijack()
}