From 7d389d22581cc785005a42d655eb7f9c32aac3ec Mon Sep 17 00:00:00 2001
From: r <r@freesoftwareextremist.com>
Date: Sat, 23 Oct 2021 13:41:41 +0000
Subject: Show signin button in case of an auth error

---
 mastodon/helper.go | 23 +++++++++++++++++++++--
 service/service.go |  3 ++-
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/mastodon/helper.go b/mastodon/helper.go
index 05af20f..cb0013d 100644
--- a/mastodon/helper.go
+++ b/mastodon/helper.go
@@ -3,12 +3,28 @@ package mastodon
 import (
 	"encoding/base64"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"net/http"
 	"os"
 )
 
+type Error struct {
+	code int
+	err  string
+}
+
+func (e Error) Error() string {
+	return e.err
+}
+
+func (e Error) IsAuthError() bool {
+	switch e.code {
+	case http.StatusForbidden, http.StatusUnauthorized:
+		return true
+	}
+	return false
+}
+
 // Base64EncodeFileName returns the base64 data URI format string of the file with the file name.
 func Base64EncodeFileName(filename string) (string, error) {
 	file, err := os.Open(filename)
@@ -51,5 +67,8 @@ func parseAPIError(prefix string, resp *http.Response) error {
 		errMsg = fmt.Sprintf("%s: %s", errMsg, e.Error)
 	}
 
-	return errors.New(errMsg)
+	return Error{
+		code: resp.StatusCode,
+		err:  errMsg,
+	}
 }
diff --git a/service/service.go b/service/service.go
index 03f0ff3..244fd81 100644
--- a/service/service.go
+++ b/service/service.go
@@ -114,7 +114,8 @@ func (s *service) ErrorPage(c *client, err error, retry bool) error {
 	var sessionErr bool
 	if err != nil {
 		errStr = err.Error()
-		if err == errInvalidSession || err == errInvalidCSRFToken {
+		if me, ok := err.(mastodon.Error); ok && me.IsAuthError() ||
+			err == errInvalidSession || err == errInvalidCSRFToken {
 			sessionErr = true
 		}
 	}
-- 
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