// Copyright (c) 2015-2021 MinIO, Inc.//// This file is part of MinIO Object Storage stack//// This program is free software: you can redistribute it and/or modify// it under the terms of the GNU Affero General Public License as published by// the Free Software Foundation, either version 3 of the License, or// (at your option) any later version.//// This program is distributed in the hope that it will be useful// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the// GNU Affero General Public License for more details.//// You should have received a copy of the GNU Affero General Public License// along with this program.  If not, see <http://www.gnu.org/licenses/>. package cmd import (	"context"	"errors"	"net/http" 	"github.com/minio/kes"	"github.com/minio/madmin-go"	"github.com/minio/minio/internal/auth"	"github.com/minio/minio/internal/config"	iampolicy "github.com/minio/pkg/iam/policy") func validateAdminReq(ctx context.Context, w http.ResponseWriter, r *http.Request, actions ...iampolicy.AdminAction) (ObjectLayer, auth.Credentials) {	// Get current object layer instance.	objectAPI := newObjectLayerFn()	if objectAPI == nil || globalNotificationSys == nil {		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)		return nil, auth.Credentials{}	} 	for _, action := range actions {		// Validate request signature.		cred, adminAPIErr := checkAdminRequestAuth(ctx, r, action, "")		if adminAPIErr != ErrNone {			writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(adminAPIErr), r.URL)			return nil, cred		}		return objectAPI, cred	}	writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrAccessDenied), r.URL)	return nil, auth.Credentials{}} // AdminError - is a generic error for all admin APIs.type AdminError struct {	Code       string	Message    string	StatusCode int} func (ae AdminError) Error() string {	return ae.Message} func toAdminAPIErr(ctx context.Context, err error) APIError {	if err == nil {		return noError	} 	var apiErr APIError	switch e := err.(type) {	case iampolicy.Error:		apiErr = APIError{			Code:           "XMinioMalformedIAMPolicy",			Description:    e.Error(),			HTTPStatusCode: http.StatusBadRequest,		}	case config.Error:		apiErr = APIError{			Code:           "XMinioConfigError",			Description:    e.Error(),			HTTPStatusCode: http.StatusBadRequest,		}	case AdminError:		apiErr = APIError{			Code:           e.Code,			Description:    e.Message,			HTTPStatusCode: e.StatusCode,		}	case SRError:		apiErr = errorCodes.ToAPIErrWithErr(e.Code, e.Cause)	case decomError:		apiErr = APIError{			Code:           "XMinioDecommissionNotAllowed",			Description:    e.Err,			HTTPStatusCode: http.StatusBadRequest,		}	default:		switch {		case errors.Is(err, errDecommissionAlreadyRunning):			apiErr = APIError{				Code:           "XMinioDecommissionNotAllowed",				Description:    err.Error(),				HTTPStatusCode: http.StatusBadRequest,			}		case errors.Is(err, errDecommissionComplete):			apiErr = APIError{				Code:           "XMinioDecommissionNotAllowed",				Description:    err.Error(),				HTTPStatusCode: http.StatusBadRequest,			}		case errors.Is(err, errConfigNotFound):			apiErr = APIError{				Code:           "XMinioConfigError",				Description:    err.Error(),				HTTPStatusCode: http.StatusNotFound,			}		case errors.Is(err, errIAMActionNotAllowed):			apiErr = APIError{				Code:           "XMinioIAMActionNotAllowed",				Description:    err.Error(),				HTTPStatusCode: http.StatusForbidden,			}		case errors.Is(err, errIAMServiceAccount):			apiErr = APIError{				Code:           "XMinioIAMServiceAccount",				Description:    err.Error(),				HTTPStatusCode: http.StatusBadRequest,			}		case errors.Is(err, errIAMServiceAccountUsed):			apiErr = APIError{				Code:           "XMinioIAMServiceAccountUsed",				Description:    err.Error(),				HTTPStatusCode: http.StatusBadRequest,			}		case errors.Is(err, errIAMNotInitialized):			apiErr = APIError{				Code:           "XMinioIAMNotInitialized",				Description:    err.Error(),				HTTPStatusCode: http.StatusServiceUnavailable,			}		case errors.Is(err, errPolicyInUse):			apiErr = APIError{				Code:           "XMinioAdminPolicyInUse",				Description:    "The policy cannot be removed, as it is in use",				HTTPStatusCode: http.StatusBadRequest,			}		case errors.Is(err, kes.ErrKeyExists):			apiErr = APIError{				Code:           "XMinioKMSKeyExists",				Description:    err.Error(),				HTTPStatusCode: http.StatusConflict,			} 		// Tier admin API errors		case errors.Is(err, madmin.ErrTierNameEmpty):			apiErr = APIError{				Code:           "XMinioAdminTierNameEmpty",				Description:    err.Error(),				HTTPStatusCode: http.StatusBadRequest,			}		case errors.Is(err, madmin.ErrTierInvalidConfig):			apiErr = APIError{				Code:           "XMinioAdminTierInvalidConfig",				Description:    err.Error(),				HTTPStatusCode: http.StatusBadRequest,			}		case errors.Is(err, madmin.ErrTierInvalidConfigVersion):			apiErr = APIError{				Code:           "XMinioAdminTierInvalidConfigVersion",				Description:    err.Error(),				HTTPStatusCode: http.StatusBadRequest,			}		case errors.Is(err, madmin.ErrTierTypeUnsupported):			apiErr = APIError{				Code:           "XMinioAdminTierTypeUnsupported",				Description:    err.Error(),				HTTPStatusCode: http.StatusBadRequest,			}		case errors.Is(err, errTierBackendInUse):			apiErr = APIError{				Code:           "XMinioAdminTierBackendInUse",				Description:    err.Error(),				HTTPStatusCode: http.StatusConflict,			}		case errors.Is(err, errTierBackendNotEmpty):			apiErr = APIError{				Code:           "XMinioAdminTierBackendNotEmpty",				Description:    err.Error(),				HTTPStatusCode: http.StatusBadRequest,			}		case errors.Is(err, errTierInsufficientCreds):			apiErr = APIError{				Code:           "XMinioAdminTierInsufficientCreds",				Description:    err.Error(),				HTTPStatusCode: http.StatusBadRequest,			}		case errIsTierPermError(err):			apiErr = APIError{				Code:           "XMinioAdminTierInsufficientPermissions",				Description:    err.Error(),				HTTPStatusCode: http.StatusBadRequest,			}		default:			apiErr = errorCodes.ToAPIErrWithErr(toAdminAPIErrCode(ctx, err), err)		}	}	return apiErr} // toAdminAPIErrCode - converts errErasureWriteQuorum error to admin API// specific error.func toAdminAPIErrCode(ctx context.Context, err error) APIErrorCode {	switch err {	case errErasureWriteQuorum:		return ErrAdminConfigNoQuorum	default:		return toAPIErrorCode(ctx, err)	}}