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httphandler.go
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httphandler.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 httphandler
import (
"errors"
"net/http"
"github.com/das08/line-bot-sdk-go/v7/linebot"
)
// EventsHandlerFunc type
type EventsHandlerFunc func([]*linebot.Event, *http.Request)
// ErrorHandlerFunc type
type ErrorHandlerFunc func(error, *http.Request)
// WebhookHandler type
type WebhookHandler struct {
channelSecret string
channelToken string
handleEvents EventsHandlerFunc
handleError ErrorHandlerFunc
}
// New returns a new WebhookHandler instance.
func New(channelSecret, channelToken string) (*WebhookHandler, error) {
if channelSecret == "" {
return nil, errors.New("missing channel secret")
}
if channelToken == "" {
return nil, errors.New("missing channel access token")
}
h := &WebhookHandler{
channelSecret: channelSecret,
channelToken: channelToken,
}
return h, nil
}
// HandleEvents method
func (wh *WebhookHandler) HandleEvents(f EventsHandlerFunc) {
wh.handleEvents = f
}
// HandleError method
func (wh *WebhookHandler) HandleError(f ErrorHandlerFunc) {
wh.handleError = f
}
// NewClient method
func (wh *WebhookHandler) NewClient(options ...linebot.ClientOption) (*linebot.Client, error) {
return linebot.New(wh.channelSecret, wh.channelToken, options...)
}
func (wh *WebhookHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
events, err := linebot.ParseRequest(wh.channelSecret, r)
if err != nil {
if wh.handleError != nil {
wh.handleError(err, r)
}
if err == linebot.ErrInvalidSignature {
w.WriteHeader(400)
} else {
w.WriteHeader(500)
}
return
}
wh.handleEvents(events, r)
}