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package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os"
"github.com/slack-go/slack"
"github.com/slack-go/slack/slackevents"
)
// You more than likely want your "Bot User OAuth Access Token" which starts with "xoxb-"
var api = slack.New("TOKEN")
func main() {
signingSecret := os.Getenv("SLACK_SIGNING_SECRET")
http.HandleFunc("/events-endpoint", func(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
return
}
sv, err := slack.NewSecretsVerifier(r.Header, signingSecret)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
return
}
if _, err := sv.Write(body); err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
if err := sv.Ensure(); err != nil {
w.WriteHeader(http.StatusUnauthorized)
return
}
eventsAPIEvent, err := slackevents.ParseEvent(json.RawMessage(body), slackevents.OptionNoVerifyToken())
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
if eventsAPIEvent.Type == slackevents.URLVerification {
var r *slackevents.ChallengeResponse
err := json.Unmarshal([]byte(body), &r)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "text")
w.Write([]byte(r.Challenge))
}
if eventsAPIEvent.Type == slackevents.CallbackEvent {
innerEvent := eventsAPIEvent.InnerEvent
switch ev := innerEvent.Data.(type) {
case *slackevents.AppMentionEvent:
api.PostMessage(ev.Channel, slack.MsgOptionText("Yes, hello.", false))
}
}
})
fmt.Println("[INFO] Server listening")
http.ListenAndServe(":3000", nil)
}
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