| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 ( |
| "crypto/hmac" |
| "crypto/sha256" |
| "encoding/base64" |
| "encoding/json" |
| "errors" |
| "strings" |
| ) |
| |
| // Sign |
| // get a signature string with given information, such as metadata or parameters |
| func Sign(metadata, key string) string { |
| return doSign([]byte(metadata), key) |
| } |
| |
| func SignWithParams(params []interface{}, metadata, key string) (string, error) { |
| if params == nil || len(params) == 0 { |
| return Sign(metadata, key), nil |
| } |
| |
| data := append(params, metadata) |
| if bytes, err := toBytes(data); err != nil { |
| // TODO |
| return "", errors.New("data convert to bytes failed") |
| } else { |
| return doSign(bytes, key), nil |
| } |
| } |
| |
| func toBytes(data []interface{}) ([]byte, error) { |
| if bytes, err := json.Marshal(data); err != nil { |
| return nil, errors.New("") |
| } else { |
| return bytes, nil |
| } |
| } |
| |
| func doSign(bytes []byte, key string) string { |
| mac := hmac.New(sha256.New, []byte(key)) |
| mac.Write(bytes) |
| signature := mac.Sum(nil) |
| return base64.URLEncoding.EncodeToString(signature) |
| } |
| |
| func IsEmpty(s string, allowSpace bool) bool { |
| if len(s) == 0 { |
| return true |
| } |
| if !allowSpace { |
| return strings.TrimSpace(s) == "" |
| } |
| return false |
| } |