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gomez.go
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gomez.go
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package main
import (
"encoding/json"
"net/http"
"fmt"
"html"
"log"
"bytes"
"flag"
"io/ioutil"
)
var conf Config
// Config is a struct for storing the parsed config.json
type Config struct {
FbToken string `json:"fb_token"`
PageToken string `json:"page_token"`
CertFile string `json:"cert_file"`
KeyFile string `json:"key_file"`
}
// MessageJSON is the message that is sent back to the user
type MessageJSON struct {
AccessToken string `json:"access_token"`
Recipient struct {
ID int64 `json:"id"`
} `json:"recipient"`
Message struct {
Text string `json:"text"`
} `json:"message"`
}
// Response is the message that is sent from from Facebook
type Response struct {
Object string `json:"object"`
Entry []struct {
ID int64 `json:"id"`
Time int64 `json:"time"`
Messaging []struct {
Sender struct {
ID int64 `json:"id"`
} `json:"sender"`
Recipient struct {
ID int64 `json:"id"`
} `json:"recipient"`
Timestamp int64 `json:"timestamp"`
Message struct {
Mid string `json:"mid"`
Seq int `json:"seq"`
Text string `json:"text"`
} `json:"message"`
} `json:"messaging"`
} `json:"entry"`
}
func sendMessage(sender int64, messageData string) {
m := MessageJSON{}
m.AccessToken = conf.PageToken
m.Recipient.ID = sender
m.Message.Text = messageData
b := new(bytes.Buffer)
json.NewEncoder(b).Encode(m)
resp, err := http.Post("https://graph.facebook.com/v2.6/me/messages","application/json",b)
if err != nil {
log.Println(err)
}
log.Println(resp)
defer resp.Body.Close()
}
func webhook(w http.ResponseWriter, r *http.Request) {
method := r.Method
if method == "GET" {
q := r.URL.Query()
if q.Get("hub.verify_token") == conf.FbToken {
fmt.Fprintf(w,q.Get("hub.challenge"))
} else {
fmt.Fprintf(w, html.EscapeString("Error wrong token"))
}
}
if method == "POST" {
res := Response{}
err := json.NewDecoder(r.Body).Decode(&res)
if err != nil {
log.Println(err)
}
log.Println(res)
if res.Entry[0].Messaging[0].Message.Text != "" {
sendMessage(res.Entry[0].Messaging[0].Sender.ID,"hey")
}
}
}
func config(file string) {
content, err := ioutil.ReadFile(file)
if err != nil {
log.Println(err)
}
err=json.Unmarshal(content, &conf)
if err != nil {
log.Println(err)
}
}
func main() {
var confFile = flag.String("config", "", "This is the path to the config file")
flag.Parse()
config(*confFile)
http.HandleFunc("/", webhook)
http.ListenAndServeTLS(":443",conf.CertFile,conf.KeyFile, nil)
}