feat: fileshare custom password support (#2493)

* feat: fileshare custom password support

* fix: blank password check

* feat: backend share link password check

* Revert "feat: backend share link password check"

This reverts commit 22c7bb0b355235b48b29938eb995b3986b1122f1.

* feat: use go-playground/validator binding rule

pkg/filemanager/manager/manager.go

@@ -111,6 +111,7 @@ type (
 	CreateShareArgs struct {
 		ExistedShareID  int
 		IsPrivate       bool
+		Password        string
 		RemainDownloads int
 		Expire          *time.Time
 		ShareView       bool

pkg/filemanager/manager/operation.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/gob"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/cloudreve/Cloudreve/v4/application/constants"
@@ -259,7 +260,10 @@ func (l *manager) CreateOrUpdateShare(ctx context.Context, path *fs.URI, args *C
 
 	password := ""
 	if args.IsPrivate {
-		password = util.RandString(8, util.RandomLowerCases)
+		password = args.Password
+		if strings.TrimSpace(password) == "" {
+			password = util.RandString(8, util.RandomLowerCases)
+		}
 	}
 
 	props := &types.ShareProps{