| 1 | package rockethook |
| 2 | |
| 3 | import ( |
| 4 | "crypto/tls" |
| 5 | "encoding/json" |
| 6 | "io" |
| 7 | "log" |
| 8 | "net" |
| 9 | "net/http" |
| 10 | "regexp" |
| 11 | ) |
| 12 | |
| 13 | // Message for rocketchat outgoing webhook. |
| 14 | type Message struct { |
| 15 | Token string `json:"token"` |
| 16 | ChannelID string `json:"channel_id"` |
| 17 | ChannelName string `json:"channel_name"` |
| 18 | Timestamp string `json:"timestamp"` |
| 19 | UserID string `json:"user_id"` |
| 20 | UserName string `json:"user_name"` |
| 21 | Text string `json:"text"` |
| 22 | } |
| 23 | |
| 24 | // Client for Rocketchat. |
| 25 | type Client struct { |
| 26 | In chan Message |
| 27 | httpclient *http.Client |
| 28 | Config |
| 29 | } |
| 30 | |
| 31 | // Config for client. |
| 32 | type Config struct { |
| 33 | BindAddress string // Address to listen on |
| 34 | Token string // Only allow this token from Rocketchat. (Allow everything when empty) |
| 35 | InsecureSkipVerify bool // disable certificate checking |
| 36 | } |
| 37 | |
| 38 | // New Rocketchat client. |
| 39 | func New(url string, config Config) *Client { |
| 40 | c := &Client{In: make(chan Message), Config: config} |
| 41 | tr := &http.Transport{ |
| 42 | TLSClientConfig: &tls.Config{InsecureSkipVerify: config.InsecureSkipVerify}, //nolint:gosec |
| 43 | } |
| 44 | c.httpclient = &http.Client{Transport: tr} |
| 45 | _, _, err := net.SplitHostPort(c.BindAddress) |
| 46 | if err != nil { |
| 47 | log.Fatalf("incorrect bindaddress %s", c.BindAddress) |
| 48 | } |
| 49 | go c.StartServer() |
| 50 | return c |
| 51 | } |
| 52 | |
| 53 | // StartServer starts a webserver listening for incoming mattermost POSTS. |
| 54 | func (c *Client) StartServer() { |
| 55 | mux := http.NewServeMux() |
| 56 | mux.Handle("/", c) |
| 57 | log.Printf("Listening on http://%v...\n", c.BindAddress) |
| 58 | if err := http.ListenAndServe(c.BindAddress, mux); err != nil { |
| 59 | log.Fatal(err) |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | // ServeHTTP implementation. |
| 64 | func (c *Client) ServeHTTP(w http.ResponseWriter, r *http.Request) { |
| 65 | if r.Method != "POST" { |
| 66 | log.Println("invalid " + r.Method + " connection from " + r.RemoteAddr) |
| 67 | http.NotFound(w, r) |
| 68 | return |
| 69 | } |
| 70 | msg := Message{} |
| 71 | |
| 72 | body, err := io.ReadAll(r.Body) |
| 73 | if err != nil { |
| 74 | log.Println(err) |
| 75 | http.NotFound(w, r) |
| 76 | return |
| 77 | } |
| 78 | defer r.Body.Close() |
| 79 | err = json.Unmarshal(body, &msg) |
| 80 | if err != nil { |
| 81 | log.Println(err) |
| 82 | http.NotFound(w, r) |
| 83 | return |
| 84 | } |
| 85 | if msg.Token == "" { |
| 86 | log.Println("no token from " + r.RemoteAddr) |
| 87 | http.NotFound(w, r) |
| 88 | return |
| 89 | } |
| 90 | msg.ChannelName = "#" + msg.ChannelName |
| 91 | if c.Token != "" { |
| 92 | if msg.Token != c.Token { |
| 93 | if regexp.MustCompile(`[^a-zA-Z0-9]+`).MatchString(msg.Token) { |
| 94 | log.Println("invalid token " + msg.Token + " from " + r.RemoteAddr) |
| 95 | } else { |
| 96 | log.Println("invalid token from " + r.RemoteAddr) |
| 97 | } |
| 98 | http.NotFound(w, r) |
| 99 | return |
| 100 | } |
| 101 | } |
| 102 | c.In <- msg |
| 103 | } |
| 104 | |
| 105 | // Receive returns an incoming message from mattermost outgoing webhooks URL. |
| 106 | func (c *Client) Receive() Message { |
| 107 | var msg Message |
| 108 | for msg = range c.In { |
| 109 | return msg |
| 110 | } |
| 111 | return msg |
| 112 | } |
| 113 | |
