feat: update reset thumbnail feature (#2854)

* update reset thumbnail feature

* consolidate supported thumbnail extensions into site config; remove dedicated API

* allow patching thumb ; remove Reset Thumbnail API

* fix code formatting

---------

Co-authored-by: Aaron Liu <abslant.liu@gmail.com>

service/basic/site.go

@@ -1,10 +1,14 @@
 package basic
 
 import (
+	"sort"
+	"strings"
+
 	"github.com/cloudreve/Cloudreve/v4/application/dependency"
 	"github.com/cloudreve/Cloudreve/v4/inventory"
 	"github.com/cloudreve/Cloudreve/v4/inventory/types"
 	"github.com/cloudreve/Cloudreve/v4/pkg/setting"
+	"github.com/cloudreve/Cloudreve/v4/pkg/thumb"
 	"github.com/cloudreve/Cloudreve/v4/service/user"
 	"github.com/gin-gonic/gin"
 	"github.com/mojocn/base64Captcha"
@@ -49,6 +53,9 @@ type SiteConfig struct {
 	ThumbnailHeight   int                       `json:"thumbnail_height,omitempty"`
 	CustomProps       []types.CustomProps       `json:"custom_props,omitempty"`
 
+	// Thumbnail section
+	ThumbExts []string `json:"thumb_exts,omitempty"`
+
 	// App settings
 	AppPromotion bool `json:"app_promotion,omitempty"`
 
@@ -118,6 +125,47 @@ func (s *GetSettingService) GetSiteConfig(c *gin.Context) (*SiteConfig, error) {
 		return &SiteConfig{
 			AppPromotion: appSetting.Promotion,
 		}, nil
+	case "thumb":
+		// Return supported thumbnail extensions from enabled generators.
+		exts := map[string]bool{}
+		if settings.BuiltinThumbGeneratorEnabled(c) {
+			for _, e := range thumb.BuiltinSupportedExts {
+				exts[e] = true
+			}
+		}
+		if settings.FFMpegThumbGeneratorEnabled(c) {
+			for _, e := range settings.FFMpegThumbExts(c) {
+				exts[strings.ToLower(e)] = true
+			}
+		}
+		if settings.VipsThumbGeneratorEnabled(c) {
+			for _, e := range settings.VipsThumbExts(c) {
+				exts[strings.ToLower(e)] = true
+			}
+		}
+		if settings.LibreOfficeThumbGeneratorEnabled(c) {
+			for _, e := range settings.LibreOfficeThumbExts(c) {
+				exts[strings.ToLower(e)] = true
+			}
+		}
+		if settings.MusicCoverThumbGeneratorEnabled(c) {
+			for _, e := range settings.MusicCoverThumbExts(c) {
+				exts[strings.ToLower(e)] = true
+			}
+		}
+		if settings.LibRawThumbGeneratorEnabled(c) {
+			for _, e := range settings.LibRawThumbExts(c) {
+				exts[strings.ToLower(e)] = true
+			}
+		}
+
+		// map -> sorted slice
+		result := make([]string, 0, len(exts))
+		for e := range exts {
+			result = append(result, e)
+		}
+		sort.Strings(result)
+		return &SiteConfig{ThumbExts: result}, nil
 	default:
 		break
 	}