From 4b099fba41e7ed56016a56d7f7aceb7082c0264c Mon Sep 17 00:00:00 2001
From: bodqhrohro <bodqhrohro@gmail.com>
Date: Sun, 8 Dec 2019 15:58:17 +0200
Subject: [PATCH] Add /kick command

---
 telegram/commands.go | 58 +++++++++++++++++++++++++++++++++-----------
 1 file changed, 44 insertions(+), 14 deletions(-)

diff --git a/telegram/commands.go b/telegram/commands.go
index 5f02c26..26f6b0d 100644
--- a/telegram/commands.go
+++ b/telegram/commands.go
@@ -112,6 +112,26 @@ func parseCommand(cmdline string) (string, []string) {
 	return bodyFields[0][1:], bodyFields[1:]
 }
 
+func (c *Client) usernameOrIdToId(username string) (int32, error) {
+	userID, err := strconv.ParseInt(username, 10, 32)
+	// couldn't parse the id, try to lookup as a username
+	if err != nil {
+		chat, err := c.client.SearchPublicChat(&client.SearchPublicChatRequest{
+			Username: username,
+		})
+		if err != nil {
+			return 0, err
+		}
+
+		userID = chat.Id
+		if userID <= 0 || userID > math.MaxInt32 {
+			return 0, errors.New("Not a user")
+		}
+	}
+
+	return int32(userID), nil
+}
+
 // ProcessTransportCommand executes a command sent directly to the component
 // and returns a response
 func (c *Client) ProcessTransportCommand(cmdline string) string {
@@ -451,25 +471,35 @@ func (c *Client) ProcessChatCommand(chatID int64, cmdline string) (string, bool)
 		}
 
 		if chatID < 0 {
-			userID, err := strconv.ParseInt(args[0], 10, 32)
-			// couldn't parse the id, try to lookup as a username
+			userID, err := c.usernameOrIdToId(args[0])
 			if err != nil {
-				chat, err := c.client.SearchPublicChat(&client.SearchPublicChatRequest{
-					Username: args[0],
-				})
-				if err != nil {
-					return err.Error(), true
-				}
-
-				userID = chat.Id
-				if userID <= 0 || userID > math.MaxInt32 {
-					return "Not a user", true
-				}
+				return err.Error(), true
 			}
 
 			_, err = c.client.AddChatMember(&client.AddChatMemberRequest{
 				ChatId: chatID,
-				UserId: int32(userID),
+				UserId: userID,
+			})
+			if err != nil {
+				return err.Error(), true
+			}
+		}
+	// kick @username from current group chat
+	case "kick":
+		if len(args) < 1 {
+			return notEnoughArguments, true
+		}
+
+		if chatID < 0 {
+			userID, err := c.usernameOrIdToId(args[0])
+			if err != nil {
+				return err.Error(), true
+			}
+
+			_, err = c.client.SetChatMemberStatus(&client.SetChatMemberStatusRequest{
+				ChatId: chatID,
+				UserId: userID,
+				Status: &client.ChatMemberStatusLeft{},
 			})
 			if err != nil {
 				return err.Error(), true