middleware.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 middleware

import (
	"context"
	"errors"
	"fmt"
	"net/http"
	"time"

	"github.com/go-kit/kit/endpoint"
	transporthttp "github.com/go-kit/kit/transport/http"

	apiv1 "k8c.io/kubermatic/v2/pkg/api/v1"
	kubermaticv1 "k8c.io/kubermatic/v2/pkg/apis/kubermatic/v1"
	"k8c.io/kubermatic/v2/pkg/handler/auth"
	"k8c.io/kubermatic/v2/pkg/handler/v1/common"
	"k8c.io/kubermatic/v2/pkg/provider"
	kubermaticcontext "k8c.io/kubermatic/v2/pkg/util/context"
	utilerrors "k8c.io/kubermatic/v2/pkg/util/errors"

	apierrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/sets"
)

const (
	datacenterContextKey kubermaticcontext.Key = "datacenter"

	// RawTokenContextKey key under which the current token (OpenID ID Token) is kept in the ctx.
	RawTokenContextKey kubermaticcontext.Key = "raw-auth-token"

	// TokenExpiryContextKey key under which the current token expiry (OpenID ID Token) is kept in the ctx.
	TokenExpiryContextKey kubermaticcontext.Key = "auth-token-expiry"

	// noTokenFoundKey key under which an error is kept when no suitable token has been found in a request.
	noTokenFoundKey kubermaticcontext.Key = "no-token-found"

	// ClusterProviderContextKey key under which the current ClusterProvider is kept in the ctx.
	ClusterProviderContextKey kubermaticcontext.Key = "cluster-provider"

	// PrivilegedClusterProviderContextKey key under which the current PrivilegedClusterProvider is kept in the ctx.
	PrivilegedClusterProviderContextKey kubermaticcontext.Key = "privileged-cluster-provider"

	// UserInfoContextKey key under which the current UserInfoExtractor is kept in the ctx.
	UserInfoContextKey kubermaticcontext.Key = "user-info"

	// AuthenticatedUserContextKey key under which the current User (from OIDC provider) is kept in the ctx.
	AuthenticatedUserContextKey kubermaticcontext.Key = "authenticated-user"

	// AddonProviderContextKey key under which the current AddonProvider is kept in the ctx.
	AddonProviderContextKey kubermaticcontext.Key = "addon-provider"

	// PrivilegedAddonProviderContextKey key under which the current PrivilegedAddonProvider is kept in the ctx.
	PrivilegedAddonProviderContextKey kubermaticcontext.Key = "privileged-addon-provider"

	// ConstraintProviderContextKey key under which the current ConstraintProvider is kept in the ctx.
	ConstraintProviderContextKey kubermaticcontext.Key = "constraint-provider"

	// PrivilegedConstraintProviderContextKey key under which the current PrivilegedConstraintProvider is kept in the ctx.
	PrivilegedConstraintProviderContextKey kubermaticcontext.Key = "privileged-constraint-provider"

	// AlertmanagerProviderContextKey key under which the current AlertmanagerProvider is kept in the ctx.
	AlertmanagerProviderContextKey kubermaticcontext.Key = "alertmanager-provider"

	// PrivilegedAlertmanagerProviderContextKey key under which the current PrivilegedAlertmanagerProvider is kept in the ctx.
	PrivilegedAlertmanagerProviderContextKey kubermaticcontext.Key = "privileged-alertmanager-provider"

	// RuleGroupProviderContextKey key under which the current RuleGroupProvider is kept in the ctx.
	RuleGroupProviderContextKey kubermaticcontext.Key = "rulegroup-provider"

	// PrivilegedRuleGroupProviderContextKey key under which the current PrivilegedRuleGroupProvider is kept in the ctx.
	PrivilegedRuleGroupProviderContextKey kubermaticcontext.Key = "privileged-rulegroup-provider"

	// EtcdBackupConfigProviderContextKey key under which the current EtcdBackupConfigProvider is kept in the ctx.
	EtcdBackupConfigProviderContextKey kubermaticcontext.Key = "etcdbackupconfig-provider"

	// PrivilegedEtcdBackupConfigProviderContextKey key under which the current PrivilegedEtcdBackupConfigProvider is kept in the ctx.
	PrivilegedEtcdBackupConfigProviderContextKey kubermaticcontext.Key = "privileged-etcdbackupconfig-provider"

	// EtcdRestoreProviderContextKey key under which the current EtcdRestoreProvider is kept in the ctx.
	EtcdRestoreProviderContextKey kubermaticcontext.Key = "etcdbrestore-provider"

	// PrivilegedEtcdRestoreProviderContextKey key under which the current PrivilegedEtcdRestoreProvider is kept in the ctx.
	PrivilegedEtcdRestoreProviderContextKey kubermaticcontext.Key = "privileged-etcdrestore-provider"

	// EtcdBackupConfigProjectProviderContextKey key under which the current EtcdBackupConfigProjectProvider is kept in the ctx.
	EtcdBackupConfigProjectProviderContextKey kubermaticcontext.Key = "etcdbackupconfig-project-provider"

	// PrivilegedEtcdBackupConfigProjectProviderContextKey key under which the current PrivilegedEtcdBackupConfigProjectProvider is kept in the ctx.
	PrivilegedEtcdBackupConfigProjectProviderContextKey kubermaticcontext.Key = "privileged-etcdbackupconfig-project-provider"

	// EtcdRestoreProjectProviderContextKey key under which the current EtcdRestoreProjectProvider is kept in the ctx.
	EtcdRestoreProjectProviderContextKey kubermaticcontext.Key = "etcdbrestore-project-provider"

	// PrivilegedEtcdRestoreProjectProviderContextKey key under which the current PrivilegedEtcdRestoreProjectProvider is kept in the ctx.
	PrivilegedEtcdRestoreProjectProviderContextKey kubermaticcontext.Key = "privileged-etcdrestore-project-provider"

	// BackupCredentialsProviderContextKey key under which the current BackupCredentialsProvider is kept in the ctx.
	BackupCredentialsProviderContextKey kubermaticcontext.Key = "backupcredentials-provider"

	// PrivilegedMLAAdminSettingProviderContextKey key under which the current PrivilegedMLAAdminSettingProvider is kept in the ctx.
	PrivilegedMLAAdminSettingProviderContextKey kubermaticcontext.Key = "privileged-mla-admin-setting-provider"

	// PrivilegedIPAMPoolProviderContextKey key under which the current PrivilegedIPAMPoolProvider is kept in the ctx.
	PrivilegedIPAMPoolProviderContextKey kubermaticcontext.Key = "privileged-ipampool-provider"

	// PrivilegedOperatingSystemProfileProviderContextKey key under which the current PrivilegedOperatingSystemProfileProvider is kept in the ctx.
	PrivilegedOperatingSystemProfileProviderContextKey kubermaticcontext.Key = "privileged-operatingsystemprofile-provider"

	UserCRContextKey                            = kubermaticcontext.UserCRContextKey
	SeedsGetterContextKey kubermaticcontext.Key = "seeds-getter"
)

// Now stubbed out to allow testing.
var Now = time.Now

// seedClusterGetter defines functionality to retrieve a seed name.
type seedClusterGetter interface {
	GetSeedCluster() apiv1.SeedCluster
}

// SetClusterProvider is a middleware that injects the current ClusterProvider into the ctx.
func SetClusterProvider(clusterProviderGetter provider.ClusterProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			clusterProvider, ctx, err := GetClusterProvider(ctx, request, seedsGetter, clusterProviderGetter)
			if err != nil {
				return nil, err
			}

			ctx = context.WithValue(ctx, ClusterProviderContextKey, clusterProvider)
			return next(ctx, request)
		}
	}
}

// SetPrivilegedClusterProvider is a middleware that injects the current ClusterProvider into the ctx.
func SetPrivilegedClusterProvider(clusterProviderGetter provider.ClusterProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			clusterProvider, ctx, err := GetClusterProvider(ctx, request, seedsGetter, clusterProviderGetter)
			if err != nil {
				return nil, err
			}

			privilegedClusterProvider := clusterProvider.(provider.PrivilegedClusterProvider)
			ctx = context.WithValue(ctx, ClusterProviderContextKey, clusterProvider)
			ctx = context.WithValue(ctx, PrivilegedClusterProviderContextKey, privilegedClusterProvider)
			return next(ctx, request)
		}
	}
}

// UserSaver is a middleware that checks if authenticated user already exists in the database
// next it creates/retrieve an internal object (kubermaticv1.User) and stores it the ctx under UserCRContextKey.
func UserSaver(userProvider provider.UserProvider) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			rawAuthenticatesUser := ctx.Value(AuthenticatedUserContextKey)
			if rawAuthenticatesUser == nil {
				return nil, utilerrors.New(http.StatusInternalServerError, "no user in context found")
			}
			authenticatedUser := rawAuthenticatesUser.(apiv1.User)

			user, err := userProvider.UserByEmail(ctx, authenticatedUser.Email)
			if err != nil {
				if !errors.Is(err, provider.ErrNotFound) {
					return nil, common.KubernetesErrorToHTTPError(err)
				}
				// handling ErrNotFound

				user, err = userProvider.CreateUser(ctx, authenticatedUser.Name,
					authenticatedUser.Email, authenticatedUser.Groups)
				if err != nil {
					if !apierrors.IsAlreadyExists(err) {
						return nil, common.KubernetesErrorToHTTPError(err)
					}
					if user, err = userProvider.UserByEmail(ctx, authenticatedUser.Email); err != nil {
						return nil, common.KubernetesErrorToHTTPError(err)
					}
				}
			}

			now := Now().UTC()

			// Throttle the last seen update to once a minute not to pressure the K8S API too much.
			if !user.Status.LastSeen.IsZero() && now.Sub(user.Status.LastSeen.Time).Minutes() < 1.0 {
				return next(context.WithValue(ctx, kubermaticcontext.UserCRContextKey, user), request)
			}

			updatedUser := user.DeepCopy()
			updatedUser.Status.LastSeen = metav1.NewTime(now)
			updatedUser.Spec.Groups = authenticatedUser.Groups
			updatedUser, err = userProvider.UpdateUser(ctx, updatedUser)

			// Ignore conflict error during update of the lastSeen field as it is not super important.
			// It can be updated next time.
			if apierrors.IsConflict(err) {
				return next(context.WithValue(ctx, kubermaticcontext.UserCRContextKey, user), request)
			}

			if err != nil {
				return nil, common.KubernetesErrorToHTTPError(err)
			}

			return next(context.WithValue(ctx, kubermaticcontext.UserCRContextKey, updatedUser), request)
		}
	}
}

// UserInfoUnauthorized tries to build userInfo for not authenticated (token) user
// instead it reads the user_id from the request and finds the associated user in the database.
func UserInfoUnauthorized(userProjectMapper provider.ProjectMemberMapper, userProvider provider.UserProvider) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			userIDGetter, ok := request.(common.UserIDGetter)
			if !ok {
				return nil, utilerrors.NewBadRequest("you can only use userInfoMiddlewareUnauthorized for endpoints that accepts user ID")
			}
			prjIDGetter, ok := request.(common.ProjectIDGetter)
			if !ok {
				return nil, utilerrors.NewBadRequest("you can only use userInfoMiddlewareUnauthorized for endpoints that accepts project ID")
			}
			userID := userIDGetter.GetUserID()
			projectID := prjIDGetter.GetProjectID()
			user, err := userProvider.UserByID(ctx, userID)
			if err != nil {
				return nil, common.KubernetesErrorToHTTPError(err)
			}

			if user.Spec.IsAdmin {
				uInfo := &provider.UserInfo{Email: user.Spec.Email, IsAdmin: true}
				return next(context.WithValue(ctx, UserInfoContextKey, uInfo), request)
			}
			uInfo, err := createUserInfo(ctx, user, projectID, userProjectMapper)
			if err != nil {
				return nil, common.KubernetesErrorToHTTPError(err)
			}
			return next(context.WithValue(ctx, UserInfoContextKey, uInfo), request)
		}
	}
}

// TokenVerifier knows how to verify a token from the incoming request.
func TokenVerifier(tokenVerifier auth.TokenVerifier, userProvider provider.UserProvider) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			if rawTokenNotFoundErr := ctx.Value(noTokenFoundKey); rawTokenNotFoundErr != nil {
				tokenNotFoundErr, ok := rawTokenNotFoundErr.(error)
				if !ok {
					return nil, utilerrors.NewNotAuthorized()
				}
				return nil, utilerrors.NewWithDetails(http.StatusUnauthorized, "not authorized", []string{tokenNotFoundErr.Error()})
			}

			t := ctx.Value(RawTokenContextKey)
			token, ok := t.(string)
			if !ok || token == "" {
				return nil, utilerrors.NewNotAuthorized()
			}

			verifyCtx, cancel := context.WithTimeout(ctx, 10*time.Second)
			defer cancel()
			claims, err := tokenVerifier.Verify(verifyCtx, token)
			if err != nil {
				return nil, utilerrors.New(http.StatusUnauthorized, fmt.Sprintf("access denied, invalid token: %v", err))
			}

			if claims.Subject == "" {
				return nil, utilerrors.NewNotAuthorized()
			}

			user := apiv1.User{
				ObjectMeta: apiv1.ObjectMeta{
					Name: claims.Name,
				},
				Email:  claims.Email,
				Groups: claims.Groups,
			}

			if err := checkBlockedTokens(ctx, claims.Email, token, userProvider); err != nil {
				return nil, err
			}

			ctx = context.WithValue(ctx, TokenExpiryContextKey, claims.Expiry)
			return next(context.WithValue(ctx, AuthenticatedUserContextKey, user), request)
		}
	}
}

// Addons is a middleware that injects the current AddonProvider into the ctx.
func Addons(clusterProviderGetter provider.ClusterProviderGetter, addonProviderGetter provider.AddonProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()

			addonProvider, err := getAddonProvider(ctx, clusterProviderGetter, addonProviderGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			ctx = context.WithValue(ctx, AddonProviderContextKey, addonProvider)
			return next(ctx, request)
		}
	}
}

// PrivilegedAddons is a middleware that injects the current PrivilegedAddonProvider into the ctx.
func PrivilegedAddons(clusterProviderGetter provider.ClusterProviderGetter, addonProviderGetter provider.AddonProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()
			addonProvider, err := getAddonProvider(ctx, clusterProviderGetter, addonProviderGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			privilegedAddonProvider := addonProvider.(provider.PrivilegedAddonProvider)
			ctx = context.WithValue(ctx, PrivilegedAddonProviderContextKey, privilegedAddonProvider)
			return next(ctx, request)
		}
	}
}

func getAddonProvider(ctx context.Context, clusterProviderGetter provider.ClusterProviderGetter, addonProviderGetter provider.AddonProviderGetter, seedsGetter provider.SeedsGetter, seedName, clusterID string) (provider.AddonProvider, error) {
	seeds, err := seedsGetter()
	if err != nil {
		return nil, err
	}

	if clusterID != "" {
		for _, seed := range seeds {
			clusterProvider, err := clusterProviderGetter(seed)
			if err != nil {
				return nil, utilerrors.NewNotFound("cluster-provider", clusterID)
			}
			if clusterProvider.IsCluster(ctx, clusterID) {
				seedName = seed.Name
				break
			}
		}
	}

	seed, found := seeds[seedName]
	if !found {
		return nil, fmt.Errorf("couldn't find seed %q", seedName)
	}

	return addonProviderGetter(seed)
}

// TokenExtractor knows how to extract a token from the incoming request.
func TokenExtractor(o auth.TokenExtractor) transporthttp.RequestFunc {
	return func(ctx context.Context, r *http.Request) context.Context {
		token, err := o.Extract(r)
		if err != nil {
			return context.WithValue(ctx, noTokenFoundKey, err)
		}
		return context.WithValue(ctx, RawTokenContextKey, token)
	}
}

func createUserInfo(ctx context.Context, user *kubermaticv1.User, projectID string, userProjectMapper provider.ProjectMemberMapper) (*provider.UserInfo, error) {
	groups := sets.NewString()
	roles := sets.NewString()

	if projectID != "" {
		var err error
		groups, err = userProjectMapper.MapUserToGroups(ctx, user, projectID)
		if err != nil {
			return nil, err
		}

		roles, err = userProjectMapper.MapUserToRoles(ctx, user, projectID)
		if err != nil {
			return nil, err
		}
	} else {
		groups.Insert(user.Spec.Groups...)
	}

	return &provider.UserInfo{Email: user.Spec.Email, Groups: groups.List(), Roles: roles}, nil
}

func GetClusterProvider(ctx context.Context, request interface{}, seedsGetter provider.SeedsGetter, clusterProviderGetter provider.ClusterProviderGetter) (provider.ClusterProvider, context.Context, error) {
	getter, ok := request.(seedClusterGetter)
	if !ok {
		return nil, nil, fmt.Errorf("request is no dcGetter")
	}
	seeds, err := seedsGetter()
	if err != nil {
		return nil, ctx, utilerrors.New(http.StatusInternalServerError, fmt.Sprintf("failed to list seeds: %v", err))
	}
	if getter.GetSeedCluster().ClusterID != "" {
		return getClusterProviderByClusterID(ctx, seeds, clusterProviderGetter, getter.GetSeedCluster().ClusterID)
	}

	seed, exists := seeds[getter.GetSeedCluster().SeedName]
	if !exists {
		return nil, ctx, utilerrors.NewNotFound("seed", getter.GetSeedCluster().SeedName)
	}
	ctx = context.WithValue(ctx, datacenterContextKey, seed)

	clusterProvider, err := clusterProviderGetter(seed)
	if err != nil {
		return nil, ctx, utilerrors.NewNotFound("cluster-provider", getter.GetSeedCluster().SeedName)
	}

	return clusterProvider, ctx, nil
}

func getClusterProviderByClusterID(ctx context.Context, seeds map[string]*kubermaticv1.Seed, clusterProviderGetter provider.ClusterProviderGetter, clusterID string) (provider.ClusterProvider, context.Context, error) {
	for _, seed := range seeds {
		clusterProvider, err := clusterProviderGetter(seed)
		if err != nil {
			return nil, ctx, utilerrors.NewNotFound("cluster-provider", clusterID)
		}
		if clusterProvider.IsCluster(ctx, clusterID) {
			return clusterProvider, ctx, nil
		}
	}
	return nil, ctx, utilerrors.NewNotFound("cluster-provider", clusterID)
}

func checkBlockedTokens(ctx context.Context, email, token string, userProvider provider.UserProvider) error {
	user, err := userProvider.UserByEmail(ctx, email)
	if err != nil {
		if !errors.Is(err, provider.ErrNotFound) {
			return common.KubernetesErrorToHTTPError(err)
		}
		return nil
	}
	blockedTokens, err := userProvider.GetInvalidatedTokens(ctx, user)
	if err != nil {
		return common.KubernetesErrorToHTTPError(err)
	}
	tokenSet := sets.NewString(blockedTokens...)
	if tokenSet.Has(token) {
		return utilerrors.NewNotAuthorized()
	}

	return nil
}

// SetSeedsGetter injects the current SeedsGetter into the ctx.
func SetSeedsGetter(seedsGetter provider.SeedsGetter) transporthttp.RequestFunc {
	return func(ctx context.Context, r *http.Request) context.Context {
		return context.WithValue(ctx, SeedsGetterContextKey, seedsGetter)
	}
}

// Constraints is a middleware that injects the current ConstraintProvider into the ctx.
func Constraints(clusterProviderGetter provider.ClusterProviderGetter, constraintProviderGetter provider.ConstraintProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()

			constraintProvider, err := getConstraintProvider(ctx, clusterProviderGetter, constraintProviderGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			ctx = context.WithValue(ctx, ConstraintProviderContextKey, constraintProvider)
			return next(ctx, request)
		}
	}
}

// PrivilegedConstraints is a middleware that injects the current PrivilegedConstraintProvider into the ctx.
func PrivilegedConstraints(clusterProviderGetter provider.ClusterProviderGetter, constraintProviderGetter provider.ConstraintProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()
			constraintProvider, err := getConstraintProvider(ctx, clusterProviderGetter, constraintProviderGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			privilegedConstraintProvider := constraintProvider.(provider.PrivilegedConstraintProvider)
			ctx = context.WithValue(ctx, PrivilegedConstraintProviderContextKey, privilegedConstraintProvider)
			return next(ctx, request)
		}
	}
}

func getConstraintProvider(ctx context.Context, clusterProviderGetter provider.ClusterProviderGetter, constraintProviderGetter provider.ConstraintProviderGetter, seedsGetter provider.SeedsGetter, seedName, clusterID string) (provider.ConstraintProvider, error) {
	seeds, err := seedsGetter()
	if err != nil {
		return nil, err
	}

	if clusterID != "" {
		for _, seed := range seeds {
			clusterProvider, err := clusterProviderGetter(seed)
			if err != nil {
				return nil, utilerrors.NewNotFound("cluster-provider", clusterID)
			}
			if clusterProvider.IsCluster(ctx, clusterID) {
				seedName = seed.Name
				break
			}
		}
	}

	seed, found := seeds[seedName]
	if !found {
		return nil, fmt.Errorf("couldn't find seed %q", seedName)
	}

	return constraintProviderGetter(seed)
}

// Alertmanagers is a middleware that injects the current AlertmanagerProvider into the ctx.
func Alertmanagers(clusterProviderGetter provider.ClusterProviderGetter, alertmanagerProviderGetter provider.AlertmanagerProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()

			alertmanagerProvider, err := getAlertmanagerProvider(ctx, clusterProviderGetter, alertmanagerProviderGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			ctx = context.WithValue(ctx, AlertmanagerProviderContextKey, alertmanagerProvider)
			return next(ctx, request)
		}
	}
}

// PrivilegedAlertmanagers is a middleware that injects the current PrivilegedAlertmanagerProvider into the ctx.
func PrivilegedAlertmanagers(clusterProviderGetter provider.ClusterProviderGetter, alertmanagerProviderGetter provider.AlertmanagerProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()
			alertmanagerProvider, err := getAlertmanagerProvider(ctx, clusterProviderGetter, alertmanagerProviderGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			privilegedAlertmanagerProvider := alertmanagerProvider.(provider.PrivilegedAlertmanagerProvider)
			ctx = context.WithValue(ctx, PrivilegedAlertmanagerProviderContextKey, privilegedAlertmanagerProvider)
			return next(ctx, request)
		}
	}
}

func getAlertmanagerProvider(ctx context.Context, clusterProviderGetter provider.ClusterProviderGetter, alertmanagerProviderGetter provider.AlertmanagerProviderGetter, seedsGetter provider.SeedsGetter, seedName, clusterID string) (provider.AlertmanagerProvider, error) {
	seeds, err := seedsGetter()
	if err != nil {
		return nil, err
	}

	if clusterID != "" {
		for _, seed := range seeds {
			clusterProvider, err := clusterProviderGetter(seed)
			if err != nil {
				return nil, common.KubernetesErrorToHTTPError(err)
			}
			if clusterProvider.IsCluster(ctx, clusterID) {
				seedName = seed.Name
				break
			}
		}
	}

	seed, found := seeds[seedName]
	if !found {
		return nil, fmt.Errorf("couldn't find seed %q", seedName)
	}

	return alertmanagerProviderGetter(seed)
}

// RuleGroups is a middleware that injects the current RuleGroupProvider into the ctx.
func RuleGroups(clusterProviderGetter provider.ClusterProviderGetter, ruleGroupProviderGetter provider.RuleGroupProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()

			ruleGroupProvider, err := getRuleGroupProvider(ctx, clusterProviderGetter, ruleGroupProviderGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			ctx = context.WithValue(ctx, RuleGroupProviderContextKey, ruleGroupProvider)
			return next(ctx, request)
		}
	}
}

// PrivilegedRuleGroups is a middleware that injects the current PrivilegedRuleGroupProvider into the ctx.
func PrivilegedRuleGroups(clusterProviderGetter provider.ClusterProviderGetter, ruleGroupProviderGetter provider.RuleGroupProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()
			ruleGroupProvider, err := getRuleGroupProvider(ctx, clusterProviderGetter, ruleGroupProviderGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			privilegedRuleGroupProvider := ruleGroupProvider.(provider.PrivilegedRuleGroupProvider)
			ctx = context.WithValue(ctx, PrivilegedRuleGroupProviderContextKey, privilegedRuleGroupProvider)
			return next(ctx, request)
		}
	}
}

func getRuleGroupProvider(ctx context.Context, clusterProviderGetter provider.ClusterProviderGetter, ruleGroupProviderGetter provider.RuleGroupProviderGetter, seedsGetter provider.SeedsGetter, seedName, clusterID string) (provider.RuleGroupProvider, error) {
	seeds, err := seedsGetter()
	if err != nil {
		return nil, err
	}

	if clusterID != "" {
		for _, seed := range seeds {
			clusterProvider, err := clusterProviderGetter(seed)
			if err != nil {
				return nil, common.KubernetesErrorToHTTPError(err)
			}
			if clusterProvider.IsCluster(ctx, clusterID) {
				seedName = seed.Name
				break
			}
		}
	}

	seed, found := seeds[seedName]
	if !found {
		return nil, fmt.Errorf("couldn't find seed %q", seedName)
	}

	return ruleGroupProviderGetter(seed)
}

// EtcdBackupConfig is a middleware that injects the current EtcdBackupConfigProvider into the ctx.
func EtcdBackupConfig(clusterProviderGetter provider.ClusterProviderGetter, etcdBackupConfigProviderGetter provider.EtcdBackupConfigProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()

			etcdBackupConfigProvider, err := getEtcdBackupConfigProvider(ctx, clusterProviderGetter, etcdBackupConfigProviderGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			ctx = context.WithValue(ctx, EtcdBackupConfigProviderContextKey, etcdBackupConfigProvider)
			return next(ctx, request)
		}
	}
}

// PrivilegedEtcdBackupConfig is a middleware that injects the current PrivilegedEtcdBackupConfigProvider into the ctx.
func PrivilegedEtcdBackupConfig(clusterProviderGetter provider.ClusterProviderGetter, etcdBackupConfigProviderGetter provider.EtcdBackupConfigProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()
			ebcProvider, err := getEtcdBackupConfigProvider(ctx, clusterProviderGetter, etcdBackupConfigProviderGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			privilegedEtcdBackupConfigProvider := ebcProvider.(provider.PrivilegedEtcdBackupConfigProvider)
			ctx = context.WithValue(ctx, PrivilegedEtcdBackupConfigProviderContextKey, privilegedEtcdBackupConfigProvider)
			return next(ctx, request)
		}
	}
}

func getEtcdBackupConfigProvider(ctx context.Context, clusterProviderGetter provider.ClusterProviderGetter, etcdBackupConfigProviderGetter provider.EtcdBackupConfigProviderGetter, seedsGetter provider.SeedsGetter, seedName, clusterID string) (provider.EtcdBackupConfigProvider, error) {
	seeds, err := seedsGetter()
	if err != nil {
		return nil, err
	}

	if clusterID != "" {
		for _, seed := range seeds {
			clusterProvider, err := clusterProviderGetter(seed)
			if err != nil {
				return nil, common.KubernetesErrorToHTTPError(err)
			}
			if clusterProvider.IsCluster(ctx, clusterID) {
				seedName = seed.Name
				break
			}
		}
	}

	seed, found := seeds[seedName]
	if !found {
		return nil, fmt.Errorf("couldn't find seed %q", seedName)
	}

	return etcdBackupConfigProviderGetter(seed)
}

// EtcdRestore is a middleware that injects the current EtcdRestoreProvider into the ctx.
func EtcdRestore(clusterProviderGetter provider.ClusterProviderGetter, etcdRestoreProviderGetter provider.EtcdRestoreProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()

			etcdRestoreProvider, err := getEtcdRestoreProvider(ctx, clusterProviderGetter, etcdRestoreProviderGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			ctx = context.WithValue(ctx, EtcdRestoreProviderContextKey, etcdRestoreProvider)
			return next(ctx, request)
		}
	}
}

// PrivilegedEtcdRestore is a middleware that injects the current PrivilegedEtcdRestoreProvider into the ctx.
func PrivilegedEtcdRestore(clusterProviderGetter provider.ClusterProviderGetter, etcdRestoreProviderGetter provider.EtcdRestoreProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()
			erProvider, err := getEtcdRestoreProvider(ctx, clusterProviderGetter, etcdRestoreProviderGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			privilegedEtcdRestoreProvider := erProvider.(provider.PrivilegedEtcdRestoreProvider)
			ctx = context.WithValue(ctx, PrivilegedEtcdRestoreProviderContextKey, privilegedEtcdRestoreProvider)
			return next(ctx, request)
		}
	}
}

func getEtcdRestoreProvider(ctx context.Context, clusterProviderGetter provider.ClusterProviderGetter, etcdRestoreProviderGetter provider.EtcdRestoreProviderGetter, seedsGetter provider.SeedsGetter, seedName, clusterID string) (provider.EtcdRestoreProvider, error) {
	seeds, err := seedsGetter()
	if err != nil {
		return nil, err
	}

	if clusterID != "" {
		for _, seed := range seeds {
			clusterProvider, err := clusterProviderGetter(seed)
			if err != nil {
				return nil, common.KubernetesErrorToHTTPError(err)
			}
			if clusterProvider.IsCluster(ctx, clusterID) {
				seedName = seed.Name
				break
			}
		}
	}

	seed, found := seeds[seedName]
	if !found {
		return nil, fmt.Errorf("couldn't find seed %q", seedName)
	}

	return etcdRestoreProviderGetter(seed)
}

// EtcdBackupConfigProject is a middleware that injects the current EtcdBackupConfigProjectProvider into the ctx.
func EtcdBackupConfigProject(etcdBackupConfigProjectProviderGetter provider.EtcdBackupConfigProjectProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			etcdBackupConfigProvider, err := getEtcdBackupConfigProjectProvider(etcdBackupConfigProjectProviderGetter, seedsGetter)
			if err != nil {
				return nil, err
			}
			ctx = context.WithValue(ctx, EtcdBackupConfigProjectProviderContextKey, etcdBackupConfigProvider)
			return next(ctx, request)
		}
	}
}

// PrivilegedEtcdBackupConfigProject is a middleware that injects the current PrivilegedEtcdBackupConfigProjectProvider into the ctx.
func PrivilegedEtcdBackupConfigProject(etcdBackupConfigProjectProviderGetter provider.EtcdBackupConfigProjectProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			ebcProvider, err := getEtcdBackupConfigProjectProvider(etcdBackupConfigProjectProviderGetter, seedsGetter)
			if err != nil {
				return nil, err
			}
			privilegedEtcdBackupConfigProvider := ebcProvider.(provider.PrivilegedEtcdBackupConfigProjectProvider)
			ctx = context.WithValue(ctx, PrivilegedEtcdBackupConfigProjectProviderContextKey, privilegedEtcdBackupConfigProvider)
			return next(ctx, request)
		}
	}
}

func getEtcdBackupConfigProjectProvider(etcdBackupConfigProjectProviderGetter provider.EtcdBackupConfigProjectProviderGetter, seedsGetter provider.SeedsGetter) (provider.EtcdBackupConfigProjectProvider, error) {
	seeds, err := seedsGetter()
	if err != nil {
		return nil, err
	}

	return etcdBackupConfigProjectProviderGetter(seeds)
}

// EtcdRestoreProject is a middleware that injects the current EtcdRestoreProjectProvider into the ctx.
func EtcdRestoreProject(etcdRestoreProjectProviderGetter provider.EtcdRestoreProjectProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			etcdRestoreProvider, err := getEtcdRestoreProjectProvider(etcdRestoreProjectProviderGetter, seedsGetter)
			if err != nil {
				return nil, err
			}
			ctx = context.WithValue(ctx, EtcdRestoreProjectProviderContextKey, etcdRestoreProvider)
			return next(ctx, request)
		}
	}
}

// PrivilegedEtcdRestoreProject is a middleware that injects the current PrivilegedEtcdRestoreProjectProvider into the ctx.
func PrivilegedEtcdRestoreProject(etcdRestoreProjectProviderGetter provider.EtcdRestoreProjectProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			ebcProvider, err := getEtcdRestoreProjectProvider(etcdRestoreProjectProviderGetter, seedsGetter)
			if err != nil {
				return nil, err
			}
			privilegedEtcdRestoreProvider := ebcProvider.(provider.PrivilegedEtcdRestoreProjectProvider)
			ctx = context.WithValue(ctx, PrivilegedEtcdRestoreProjectProviderContextKey, privilegedEtcdRestoreProvider)
			return next(ctx, request)
		}
	}
}

func getEtcdRestoreProjectProvider(etcdRestoreProjectProviderGetter provider.EtcdRestoreProjectProviderGetter, seedsGetter provider.SeedsGetter) (provider.EtcdRestoreProjectProvider, error) {
	seeds, err := seedsGetter()
	if err != nil {
		return nil, err
	}

	return etcdRestoreProjectProviderGetter(seeds)
}

// BackupCredentials is a middleware that injects the current BackupCredentialsProvider into the ctx.
func BackupCredentials(backupCredentialsProviderGetter provider.BackupCredentialsProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()

			seeds, err := seedsGetter()
			if err != nil {
				return nil, err
			}

			seed, found := seeds[seedCluster.SeedName]
			if !found {
				return nil, utilerrors.NewBadRequest("couldn't find seed %q", seedCluster.SeedName)
			}

			backupCredentialsProvider, err := backupCredentialsProviderGetter(seed)
			if err != nil {
				return nil, err
			}

			ctx = context.WithValue(ctx, BackupCredentialsProviderContextKey, backupCredentialsProvider)
			return next(ctx, request)
		}
	}
}

// PrivilegedMLAAdminSetting is a middleware that injects the current PrivilegedMLAAdminSettingProvider into the ctx.
func PrivilegedMLAAdminSetting(clusterProviderGetter provider.ClusterProviderGetter, mlaAdminSettingProviderGetter provider.PrivilegedMLAAdminSettingProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()
			privilegedMLAAdminSettingProvider, err := getPrivilegedMLAAdminSettingProvider(ctx, clusterProviderGetter, mlaAdminSettingProviderGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			ctx = context.WithValue(ctx, PrivilegedMLAAdminSettingProviderContextKey, privilegedMLAAdminSettingProvider)
			return next(ctx, request)
		}
	}
}

func getPrivilegedMLAAdminSettingProvider(ctx context.Context, clusterProviderGetter provider.ClusterProviderGetter, mlaAdminSettingProviderGetter provider.PrivilegedMLAAdminSettingProviderGetter, seedsGetter provider.SeedsGetter, seedName, clusterID string) (provider.PrivilegedMLAAdminSettingProvider, error) {
	seeds, err := seedsGetter()
	if err != nil {
		return nil, err
	}

	if clusterID != "" {
		for _, seed := range seeds {
			clusterProvider, err := clusterProviderGetter(seed)
			if err != nil {
				return nil, common.KubernetesErrorToHTTPError(err)
			}
			if clusterProvider.IsCluster(ctx, clusterID) {
				seedName = seed.Name
				break
			}
		}
	}

	seed, found := seeds[seedName]
	if !found {
		return nil, fmt.Errorf("couldn't find seed %q", seedName)
	}

	return mlaAdminSettingProviderGetter(seed)
}

// PrivilegedIPAMPool is a middleware that injects the current PrivilegedIPAMPoolProvider into the ctx.
func PrivilegedIPAMPool(ipamPoolProviderGetter provider.PrivilegedIPAMPoolProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()

			seeds, err := seedsGetter()
			if err != nil {
				return nil, err
			}

			seed, found := seeds[seedCluster.SeedName]
			if !found {
				return nil, utilerrors.NewBadRequest("couldn't find seed %q", seedCluster.SeedName)
			}

			privilegedIPAMPoolProvider, err := ipamPoolProviderGetter(seed)
			if err != nil {
				return nil, err
			}

			ctx = context.WithValue(ctx, PrivilegedIPAMPoolProviderContextKey, privilegedIPAMPoolProvider)
			return next(ctx, request)
		}
	}
}

// PrivilegedOperatingSystemProfile is a middleware that injects the current PrivilegedOperatingSystemProfileProvider into the ctx.
func PrivilegedOperatingSystemProfile(clusterProviderGetter provider.ClusterProviderGetter, providerGetter provider.PrivilegedOperatingSystemProfileProviderGetter, seedsGetter provider.SeedsGetter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (response interface{}, err error) {
			seedCluster := request.(seedClusterGetter).GetSeedCluster()
			privilegedOperatingSystemProfileProvider, err := getPrivilegedOperatingSystemProfileProvider(ctx, clusterProviderGetter, providerGetter, seedsGetter, seedCluster.SeedName, seedCluster.ClusterID)
			if err != nil {
				return nil, err
			}
			ctx = context.WithValue(ctx, PrivilegedOperatingSystemProfileProviderContextKey, privilegedOperatingSystemProfileProvider)
			return next(ctx, request)
		}
	}
}

func getPrivilegedOperatingSystemProfileProvider(ctx context.Context, clusterProviderGetter provider.ClusterProviderGetter, providerGetter provider.PrivilegedOperatingSystemProfileProviderGetter, seedsGetter provider.SeedsGetter, seedName, clusterID string) (provider.PrivilegedOperatingSystemProfileProvider, error) {
	seeds, err := seedsGetter()
	if err != nil {
		return nil, err
	}

	if clusterID != "" {
		for _, seed := range seeds {
			clusterProvider, err := clusterProviderGetter(seed)
			if err != nil {
				return nil, common.KubernetesErrorToHTTPError(err)
			}
			if clusterProvider.IsCluster(ctx, clusterID) {
				seedName = seed.Name
				break
			}
		}
	}

	seed, found := seeds[seedName]
	if !found {
		return nil, fmt.Errorf("couldn't find seed %q", seedName)
	}

	return providerGetter(seed)
}