You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: common.go
    path of file: ./repos/storj/satellite/admin
    
    the code of the file until where you have to start completion: // Copyright (C) 2020 Storj Labs, Inc.
// See LICENSE for copying information.

package admin

import (
	"encoding/hex"
	"encoding/json"
	"net/http"

	"github.com/zeebo/errs"

	"storj.io/common/uuid"
)

// Error is default error class for admin package.
var Error = errs.Class("admin")

func sendJSONError(w http.ResponseWriter, errMsg, detail string, statusCode int) {
	errStr := struct {
		Error  string `json:"error"`
		Detail string `json:"detail"`
	}{
		Error:  errMsg,
		Detail: detail,
	}
	body, err := json.Marshal(errStr)
    
func uuidFromString(uuidString string) (id uuid.UUID, err error) {
	if len(uuidString) == len(uuid.UUID{}.String()) {
		id, err = uuid.FromString(uuidString)
		if err != nil {
			return id, Error.Wrap(err)
		}
	} else {
		// this case means that dashes may not have been included in the ID passed in
		// to parse, decode from hex, and create UUID from bytes
		b, err := hex.DecodeString(uuidString)
		if err != nil {
			return id, Error.Wrap(err)
		}
		id, err = uuid.FromBytes(b)
		if err != nil {
			return id, Error.Wrap(err)
		}
	}
	return id, nil
}