后台站点设计UIUX优化

backend/handler/upload.go

@@ -230,3 +230,82 @@ func (h *Handlers) UploadBackground(c *gin.Context) {
 	out["url"] = url
 	c.JSON(http.StatusOK, out)
 }
+
+// UploadBrand 超管上传 Logo / Favicon，只落盘返回 URL，不写站点设置
+func (h *Handlers) UploadBrand(c *gin.Context) {
+	slot := c.PostForm("slot")
+	if _, ok := service.NormalizeBrandSlot(slot); !ok {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请指定 logo_light、logo_dark 或 favicon"})
+		return
+	}
+	maxB := int64(service.BrandLogoMaxBytes)
+	if slot == service.BrandSlotFavicon {
+		maxB = service.BrandFaviconMaxBytes
+	}
+	c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, maxB+4096)
+
+	fh, err := c.FormFile("file")
+	if err != nil {
+		var maxErr *http.MaxBytesError
+		if errors.As(err, &maxErr) {
+			c.JSON(http.StatusRequestEntityTooLarge, gin.H{"error": brandTooLarge(slot)})
+			return
+		}
+		c.JSON(http.StatusBadRequest, gin.H{"error": "图片过大或格式不正确"})
+		return
+	}
+	if fh.Size > maxB {
+		c.JSON(http.StatusRequestEntityTooLarge, gin.H{"error": brandTooLarge(slot)})
+		return
+	}
+	f, err := fh.Open()
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "读取图片失败"})
+		return
+	}
+	defer f.Close()
+
+	url, err := h.Upload.SaveBrand(slot, f)
+	if err != nil {
+		var maxErr *http.MaxBytesError
+		if errors.As(err, &maxErr) {
+			c.JSON(http.StatusRequestEntityTooLarge, gin.H{"error": brandTooLarge(slot)})
+			return
+		}
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"url": url})
+}
+
+type brandFromMediaRequest struct {
+	AttachmentID uint   `json:"attachment_id"`
+	Slot         string `json:"slot"`
+}
+
+// UploadBrandFromMedia 把本人媒体库图片复制进品牌目录，不写站点设置
+func (h *Handlers) UploadBrandFromMedia(c *gin.Context) {
+	var req brandFromMediaRequest
+	if err := c.ShouldBindJSON(&req); err != nil || req.AttachmentID == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "请选择媒体库中的图片"})
+		return
+	}
+	claims := middleware.CurrentUser(c)
+	if claims == nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "请先登录"})
+		return
+	}
+	url, err := h.Upload.CopyBrandFromMedia(claims.ID, req.AttachmentID, req.Slot)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"url": url})
+}
+
+func brandTooLarge(slot string) string {
+	if slot == service.BrandSlotFavicon {
+		return "Favicon 不能超过 512KB"
+	}
+	return "Logo 不能超过 2MB"
+}