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package rockethook
import (
"crypto/tls"
"encoding/json"
"io/ioutil"
"log"
"net"
"net/http"
"regexp"
)
// Message for rocketchat outgoing webhook.
type Message struct {
Token string `json:"token"`
ChannelID string `json:"channel_id"`
ChannelName string `json:"channel_name"`
Timestamp string `json:"timestamp"`
UserID string `json:"user_id"`
UserName string `json:"user_name"`
Text string `json:"text"`
}
// Client for Rocketchat.
type Client struct {
In chan Message
httpclient *http.Client
Config
}
// Config for client.
type Config struct {
BindAddress string // Address to listen on
Token string // Only allow this token from Rocketchat. (Allow everything when empty)
InsecureSkipVerify bool // disable certificate checking
}
// New Rocketchat client.
func New(url string, config Config) *Client {
c := &Client{In: make(chan Message), Config: config}
tr := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: config.InsecureSkipVerify}, //nolint:gosec
}
c.httpclient = &http.Client{Transport: tr}
_, _, err := net.SplitHostPort(c.BindAddress)
if err != nil {
log.Fatalf("incorrect bindaddress %s", c.BindAddress)
}
go c.StartServer()
return c
}
// StartServer starts a webserver listening for incoming mattermost POSTS.
func (c *Client) StartServer() {
mux := http.NewServeMux()
mux.Handle("/", c)
log.Printf("Listening on http://%v...\n", c.BindAddress)
if err := http.ListenAndServe(c.BindAddress, mux); err != nil {
log.Fatal(err)
}
}
// ServeHTTP implementation.
func (c *Client) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
log.Println("invalid " + r.Method + " connection from " + r.RemoteAddr)
http.NotFound(w, r)
return
}
msg := Message{}
body, err := ioutil.ReadAll(r.Body)
if err != nil {
log.Println(err)
http.NotFound(w, r)
return
}
defer r.Body.Close()
err = json.Unmarshal(body, &msg)
if err != nil {
log.Println(err)
http.NotFound(w, r)
return
}
if msg.Token == "" {
log.Println("no token from " + r.RemoteAddr)
http.NotFound(w, r)
return
}
msg.ChannelName = "#" + msg.ChannelName
if c.Token != "" {
if msg.Token != c.Token {
if regexp.MustCompile(`[^a-zA-Z0-9]+`).MatchString(msg.Token) {
log.Println("invalid token " + msg.Token + " from " + r.RemoteAddr)
} else {
log.Println("invalid token from " + r.RemoteAddr)
}
http.NotFound(w, r)
return
}
}
c.In <- msg
}
// Receive returns an incoming message from mattermost outgoing webhooks URL.
func (c *Client) Receive() Message {
var msg Message
for msg = range c.In {
return msg
}
return msg
}
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