support password file and improve check auth

main.go

@@ -1,8 +1,10 @@
 package main
 
 import (
+	"bytes"
 	"flag"
 	"log"
+	"os"
 	"time"
 )
 
@@ -13,6 +15,7 @@ func main() {
 	flag.StringVar(&qbitoptions.Uri, "qbittorrent-uri", "http://localhost:8080", "URI of qbittorrent")
 	flag.StringVar(&qbitoptions.Username, "qbittorrent-username", "", "Username of qbittorrent")
 	flag.StringVar(&qbitoptions.Password, "qbittorrent-password", "", "Password of qbittorrent")
+	flag.StringVar(&qbitoptions.PasswordFile, "qbittorrent-password-file", "", "Password file with the password of qbittorrent")
 	flag.StringVar(&qbitoptions.SyncTag, "qbittorrent-sync-tag", "Sync", "Tag of qbittorrent to copy")
 	flag.StringVar(&qbitoptions.SyncedTag, "qbittorrent-synced-tag", "", "Tag of qbittorrent when copy finished")
 	flag.StringVar(&rsyncoptions.Hostname, "rsync-hostname", "", "Rsync host")
@@ -22,6 +25,19 @@ func main() {
 	flag.IntVar(&poolTime, "pool-time", 30, "Number of second to check new files to sync")
 	flag.Parse()
 
+	if qbitoptions.PasswordFile != "" {
+		var b []byte
+		var ok bool
+		var err error
+		if b, err = os.ReadFile(qbitoptions.PasswordFile); err != nil {
+			log.Fatalf("[Qbit] Reading password file failed: %v", err)
+		}
+		if b, ok = bytes.CutSuffix(b, []byte{'\r', '\n'}); !ok {
+			b, _ = bytes.CutSuffix(b, []byte{'\n'})
+		}
+		qbitoptions.Password = string(b)
+	}
+
 	if qbitoptions.Uri == "" ||
 		qbitoptions.Username == "" ||
 		qbitoptions.Password == "" ||

qbittorent.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"bytes"
+	"errors"
 	"fmt"
 	"strings"
 
@@ -11,6 +13,7 @@ type QBitTorrentOptions struct {
 	Uri          string
 	Username     string
 	Password     string
+	PasswordFile string
 	SyncTag      string
 	SyncedTag    string
 }
@@ -32,7 +35,7 @@ type Torrent struct {
 func NewQBittorrentCli(options *QBitTorrentOptions) (*QBittorrentCli, error) {
 	r := resty.New().SetBaseURL(fmt.Sprintf("%s/api/v2", options.Uri))
 
-	_, err := r.
+	result, err := r.
 		R().
 		SetFormData(map[string]string{
 			"username": options.Username,
@@ -44,6 +47,10 @@ func NewQBittorrentCli(options *QBitTorrentOptions) (*QBittorrentCli, error) {
 		return nil, err
 	}
 
+	if !bytes.Equal(result.Body(), []byte("Ok.")) {
+		return nil, errors.New("auth failed")
+	}
+
 	cli := &QBittorrentCli{
 		SyncTag:   options.SyncTag,
 		SyncedTag: options.SyncedTag,