Added support proxy-socks5 protocol. It actual for the Russian Internet users because of the lock the Telegram

bot.go

@@ -18,6 +18,7 @@ import (
 	"time"
 
 	"github.com/technoweenie/multipartstreamer"
+	"golang.org/x/net/proxy"
 )
 
 // BotAPI allows you to interact with the Telegram Bot API.
@@ -31,9 +32,36 @@ type BotAPI struct {
 }
 
 // NewBotAPI creates a new BotAPI instance.
+// 'proxyparams' only support socks5 protocol.
+//
+// For example: tgbotapi.NewBotAPI("my:token", "socks5", "192.168.1.1:1080", <nil, *proxy.Auth>
+// *proxy.Auth format see here: https://github.com/golang/net/blob/master/proxy/socks5.go#L17)
 //
 // It requires a token, provided by @BotFather on Telegram.
-func NewBotAPI(token string) (*BotAPI, error) {
+func NewBotAPI(token string, proxyparam ...interface{}) (*BotAPI, error) {
+	// create a socks5 dialer
+
+	if len(proxyparam) > 0 {
+
+		var auth *proxy.Auth
+		if proxyparam[0] == "socks5" {
+			if proxyparam[2] == nil {
+				auth = nil
+			} else {
+				auth = proxyparam[2].(*proxy.Auth)
+			}
+			dialer, err := proxy.SOCKS5("tcp", proxyparam[1].(string), auth, proxy.Direct)
+			if err != nil {
+				return nil, err
+			}
+			// setup a http client
+			httpTransport := &http.Transport{}
+
+			// set our socks5 as the dialer
+			httpTransport.Dial = dialer.Dial
+			return NewBotAPIWithClient(token, &http.Client{Transport: httpTransport})
+		}
+	}
 	return NewBotAPIWithClient(token, &http.Client{})
 }