/
webhook.go
59 lines (53 loc) · 1.62 KB
/
webhook.go
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// Copyright 2016 LINE Corporation
//
// LINE Corporation 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 linebot
import (
"crypto/hmac"
"crypto/sha256"
"encoding/base64"
"encoding/json"
"io/ioutil"
"net/http"
)
// ParseRequest method
func (client *Client) ParseRequest(r *http.Request) ([]*Event, error) {
return ParseRequest(client.channelSecret, r)
}
// ParseRequest func
func ParseRequest(channelSecret string, r *http.Request) ([]*Event, error) {
defer r.Body.Close()
body, err := ioutil.ReadAll(r.Body)
if err != nil {
return nil, err
}
if !validateSignature(channelSecret, r.Header.Get("X-Line-Signature"), body) {
return nil, ErrInvalidSignature
}
request := &struct {
Events []*Event `json:"events"`
}{}
if err = json.Unmarshal(body, request); err != nil {
return nil, err
}
return request.Events, nil
}
func validateSignature(channelSecret, signature string, body []byte) bool {
decoded, err := base64.StdEncoding.DecodeString(signature)
if err != nil {
return false
}
hash := hmac.New(sha256.New, []byte(channelSecret))
hash.Write(body)
return hmac.Equal(decoded, hash.Sum(nil))
}