From 9f95a1b686e0e6f929b47a333e67150a4771a91c Mon Sep 17 00:00:00 2001
From: Tulir Asokan <tulir@maunium.net>
Date: Fri, 27 Jan 2023 23:35:26 +0200
Subject: [PATCH] Add better error message when QR login fails due to captcha

Closes #38
---
 commands.go | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/commands.go b/commands.go
index 186848e..2a22aef 100644
--- a/commands.go
+++ b/commands.go
@@ -17,11 +17,15 @@
 package main
 
 import (
+	"bytes"
 	"context"
+	"errors"
 	"fmt"
+	"net/http"
 	"strconv"
 	"strings"
 
+	"github.com/bwmarrin/discordgo"
 	"github.com/skip2/go-qrcode"
 
 	"maunium.net/go/mautrix"
@@ -142,7 +146,13 @@ func fnLoginQR(ce *WrappedCommandEvent) {
 
 	user, err := client.Result()
 	if err != nil || len(user.Token) == 0 {
-		ce.Reply("Error logging in: %v", err)
+		if restErr := (&discordgo.RESTError{}); errors.As(err, &restErr) &&
+			restErr.Response.StatusCode == http.StatusBadRequest &&
+			bytes.Contains(restErr.ResponseBody, []byte("captcha-required")) {
+			ce.Reply("Error logging in: %v\n\nCAPTCHAs are currently not supported - use token login instead", err)
+		} else {
+			ce.Reply("Error logging in: %v", err)
+		}
 		return
 	} else if err = ce.User.Login(user.Token); err != nil {
 		ce.Reply("Error connecting after login: %v", err)