diff --git a/pkg/thumb/ffmpeg.go b/pkg/thumb/ffmpeg.go
index d98f107..45814b3 100644
--- a/pkg/thumb/ffmpeg.go
+++ b/pkg/thumb/ffmpeg.go
@@ -4,14 +4,15 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	model "github.com/cloudreve/Cloudreve/v3/models"
-	"github.com/cloudreve/Cloudreve/v3/pkg/util"
-	"github.com/gofrs/uuid"
 	"io"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
+
+	model "github.com/cloudreve/Cloudreve/v3/models"
+	"github.com/cloudreve/Cloudreve/v3/pkg/util"
+	"github.com/gofrs/uuid"
 )
 
 func init() {
@@ -24,10 +25,18 @@ type FfmpegGenerator struct {
 }
 
 func (f *FfmpegGenerator) Generate(ctx context.Context, file io.Reader, src, name string, options map[string]string) (*Result, error) {
-	ffmpegOpts := model.GetSettingByNames("thumb_ffmpeg_path", "thumb_ffmpeg_exts", "thumb_ffmpeg_seek", "thumb_encode_method", "temp_path")
+	const (
+		thumbFFMpegPath   = "thumb_ffmpeg_path"
+		thumbFFMpegExts   = "thumb_ffmpeg_exts"
+		thumbFFMpegSeek   = "thumb_ffmpeg_seek"
+		thumbEncodeMethod = "thumb_encode_method"
+		tempPath          = "temp_path"
+	)
+	ffmpegOpts := model.GetSettingByNames(thumbFFMpegPath, thumbFFMpegExts, thumbFFMpegSeek, thumbEncodeMethod, tempPath)
 
-	if f.lastRawExts != ffmpegOpts["thumb_ffmpeg_exts"] {
-		f.exts = strings.Split(ffmpegOpts["thumb_ffmpeg_exts"], ",")
+	if f.lastRawExts != ffmpegOpts[thumbFFMpegExts] {
+		f.exts = strings.Split(ffmpegOpts[thumbFFMpegExts], ",")
+		f.lastRawExts = ffmpegOpts[thumbFFMpegExts]
 	}
 
 	if !util.IsInExtensionList(f.exts, name) {
@@ -35,16 +44,16 @@ func (f *FfmpegGenerator) Generate(ctx context.Context, file io.Reader, src, nam
 	}
 
 	tempOutputPath := filepath.Join(
-		util.RelativePath(ffmpegOpts["temp_path"]),
+		util.RelativePath(ffmpegOpts[tempPath]),
 		"thumb",
-		fmt.Sprintf("thumb_%s.%s", uuid.Must(uuid.NewV4()).String(), ffmpegOpts["thumb_encode_method"]),
+		fmt.Sprintf("thumb_%s.%s", uuid.Must(uuid.NewV4()).String(), ffmpegOpts[thumbEncodeMethod]),
 	)
 
 	tempInputPath := src
 	if tempInputPath == "" {
 		// If not local policy files, download to temp folder
 		tempInputPath = filepath.Join(
-			util.RelativePath(ffmpegOpts["temp_path"]),
+			util.RelativePath(ffmpegOpts[tempPath]),
 			"thumb",
 			fmt.Sprintf("ffmpeg_%s%s", uuid.Must(uuid.NewV4()).String(), filepath.Ext(name)),
 		)
@@ -68,7 +77,7 @@ func (f *FfmpegGenerator) Generate(ctx context.Context, file io.Reader, src, nam
 	// Invoke ffmpeg
 	scaleOpt := fmt.Sprintf("scale=%s:%s:force_original_aspect_ratio=decrease", options["thumb_width"], options["thumb_height"])
 	cmd := exec.CommandContext(ctx,
-		ffmpegOpts["thumb_ffmpeg_path"], "-ss", ffmpegOpts["thumb_ffmpeg_seek"], "-i", tempInputPath,
+		ffmpegOpts[thumbFFMpegPath], "-ss", ffmpegOpts[thumbFFMpegSeek], "-i", tempInputPath,
 		"-vf", scaleOpt, "-vframes", "1", tempOutputPath)
 
 	// Redirect IO
diff --git a/pkg/thumb/libreoffice.go b/pkg/thumb/libreoffice.go
index 75e871b..7492613 100644
--- a/pkg/thumb/libreoffice.go
+++ b/pkg/thumb/libreoffice.go
@@ -4,14 +4,15 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	model "github.com/cloudreve/Cloudreve/v3/models"
-	"github.com/cloudreve/Cloudreve/v3/pkg/util"
-	"github.com/gofrs/uuid"
 	"io"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
+
+	model "github.com/cloudreve/Cloudreve/v3/models"
+	"github.com/cloudreve/Cloudreve/v3/pkg/util"
+	"github.com/gofrs/uuid"
 )
 
 func init() {
@@ -24,10 +25,17 @@ type LibreOfficeGenerator struct {
 }
 
 func (l *LibreOfficeGenerator) Generate(ctx context.Context, file io.Reader, src string, name string, options map[string]string) (*Result, error) {
-	sofficeOpts := model.GetSettingByNames("thumb_libreoffice_path", "thumb_libreoffice_exts", "thumb_encode_method", "temp_path")
+	const (
+		thumbLibreOfficePath = "thumb_libreoffice_path"
+		thumbLibreOfficeExts = "thumb_libreoffice_exts"
+		thumbEncodeMethod    = "thumb_encode_method"
+		tempPath             = "temp_path"
+	)
+	sofficeOpts := model.GetSettingByNames(thumbLibreOfficePath, thumbLibreOfficeExts, thumbEncodeMethod, tempPath)
 
-	if l.lastRawExts != sofficeOpts["thumb_libreoffice_exts"] {
-		l.exts = strings.Split(sofficeOpts["thumb_libreoffice_exts"], ",")
+	if l.lastRawExts != sofficeOpts[thumbLibreOfficeExts] {
+		l.exts = strings.Split(sofficeOpts[thumbLibreOfficeExts], ",")
+		l.lastRawExts = sofficeOpts[thumbLibreOfficeExts]
 	}
 
 	if !util.IsInExtensionList(l.exts, name) {
@@ -35,7 +43,7 @@ func (l *LibreOfficeGenerator) Generate(ctx context.Context, file io.Reader, src
 	}
 
 	tempOutputPath := filepath.Join(
-		util.RelativePath(sofficeOpts["temp_path"]),
+		util.RelativePath(sofficeOpts[tempPath]),
 		"thumb",
 		fmt.Sprintf("soffice_%s", uuid.Must(uuid.NewV4()).String()),
 	)
@@ -44,7 +52,7 @@ func (l *LibreOfficeGenerator) Generate(ctx context.Context, file io.Reader, src
 	if tempInputPath == "" {
 		// If not local policy files, download to temp folder
 		tempInputPath = filepath.Join(
-			util.RelativePath(sofficeOpts["temp_path"]),
+			util.RelativePath(sofficeOpts[tempPath]),
 			"thumb",
 			fmt.Sprintf("soffice_%s%s", uuid.Must(uuid.NewV4()).String(), filepath.Ext(name)),
 		)
@@ -66,9 +74,9 @@ func (l *LibreOfficeGenerator) Generate(ctx context.Context, file io.Reader, src
 	}
 
 	// Convert the document to an image
-	cmd := exec.CommandContext(ctx, sofficeOpts["thumb_libreoffice_path"], "--headless",
+	cmd := exec.CommandContext(ctx, sofficeOpts[thumbLibreOfficePath], "--headless",
 		"-nologo", "--nofirststartwizard", "--invisible", "--norestore", "--convert-to",
-		sofficeOpts["thumb_encode_method"], "--outdir", tempOutputPath, tempInputPath)
+		sofficeOpts[thumbEncodeMethod], "--outdir", tempOutputPath, tempInputPath)
 
 	// Redirect IO
 	var stdErr bytes.Buffer
@@ -83,7 +91,7 @@ func (l *LibreOfficeGenerator) Generate(ctx context.Context, file io.Reader, src
 	return &Result{
 		Path: filepath.Join(
 			tempOutputPath,
-			strings.TrimSuffix(filepath.Base(tempInputPath), filepath.Ext(tempInputPath))+"."+sofficeOpts["thumb_encode_method"],
+			strings.TrimSuffix(filepath.Base(tempInputPath), filepath.Ext(tempInputPath))+"."+sofficeOpts[thumbEncodeMethod],
 		),
 		Continue: true,
 		Cleanup:  []func(){func() { _ = os.RemoveAll(tempOutputPath) }},
diff --git a/pkg/thumb/vips.go b/pkg/thumb/vips.go
index ac43535..b59c13a 100644
--- a/pkg/thumb/vips.go
+++ b/pkg/thumb/vips.go
@@ -4,13 +4,14 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	model "github.com/cloudreve/Cloudreve/v3/models"
-	"github.com/cloudreve/Cloudreve/v3/pkg/util"
-	"github.com/gofrs/uuid"
 	"io"
 	"os/exec"
 	"path/filepath"
 	"strings"
+
+	model "github.com/cloudreve/Cloudreve/v3/models"
+	"github.com/cloudreve/Cloudreve/v3/pkg/util"
+	"github.com/gofrs/uuid"
 )
 
 func init() {
@@ -23,10 +24,18 @@ type VipsGenerator struct {
 }
 
 func (v *VipsGenerator) Generate(ctx context.Context, file io.Reader, src, name string, options map[string]string) (*Result, error) {
-	vipsOpts := model.GetSettingByNames("thumb_vips_path", "thumb_vips_exts", "thumb_encode_quality", "thumb_encode_method", "temp_path")
+	const (
+		thumbVipsPath      = "thumb_vips_path"
+		thumbVipsExts      = "thumb_vips_exts"
+		thumbEncodeQuality = "thumb_encode_quality"
+		thumbEncodeMethod  = "thumb_encode_method"
+		tempPath           = "temp_path"
+	)
+	vipsOpts := model.GetSettingByNames(thumbVipsPath, thumbVipsExts, thumbEncodeQuality, thumbEncodeMethod, tempPath)
 
-	if v.lastRawExts != vipsOpts["thumb_vips_exts"] {
-		v.exts = strings.Split(vipsOpts["thumb_vips_exts"], ",")
+	if v.lastRawExts != vipsOpts[thumbVipsExts] {
+		v.exts = strings.Split(vipsOpts[thumbVipsExts], ",")
+		v.lastRawExts = vipsOpts[thumbVipsExts]
 	}
 
 	if !util.IsInExtensionList(v.exts, name) {
@@ -34,21 +43,21 @@ func (v *VipsGenerator) Generate(ctx context.Context, file io.Reader, src, name
 	}
 
 	outputOpt := ".png"
-	if vipsOpts["thumb_encode_method"] == "jpg" {
-		outputOpt = fmt.Sprintf(".jpg[Q=%s]", vipsOpts["thumb_encode_quality"])
+	if vipsOpts[thumbEncodeMethod] == "jpg" {
+		outputOpt = fmt.Sprintf(".jpg[Q=%s]", vipsOpts[thumbEncodeQuality])
 	}
 
 	cmd := exec.CommandContext(ctx,
-		vipsOpts["thumb_vips_path"], "thumbnail_source", "[descriptor=0]", outputOpt, options["thumb_width"],
+		vipsOpts[thumbVipsPath], "thumbnail_source", "[descriptor=0]", outputOpt, options["thumb_width"],
 		"--height", options["thumb_height"])
 
-	tempPath := filepath.Join(
-		util.RelativePath(vipsOpts["temp_path"]),
+	outTempPath := filepath.Join(
+		util.RelativePath(vipsOpts[tempPath]),
 		"thumb",
 		fmt.Sprintf("thumb_%s", uuid.Must(uuid.NewV4()).String()),
 	)
 
-	thumbFile, err := util.CreatNestedFile(tempPath)
+	thumbFile, err := util.CreatNestedFile(outTempPath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create temp file: %w", err)
 	}
@@ -66,7 +75,7 @@ func (v *VipsGenerator) Generate(ctx context.Context, file io.Reader, src, name
 		return nil, fmt.Errorf("failed to invoke vips: %w", err)
 	}
 
-	return &Result{Path: tempPath}, nil
+	return &Result{Path: outTempPath}, nil
 }
 
 func (v *VipsGenerator) Priority() int {