采用中间件授权的方式

api/core/middleware/static.go

@@ -0,0 +1,78 @@
+package middleware
+
+import (
+	"bytes"
+	"geekai/utils"
+	"image"
+	"image/jpeg"
+	"net/http"
+	"os"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"github.com/nfnt/resize"
+	"golang.org/x/image/webp"
+)
+
+// 静态资源中间件
+func StaticMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+
+		url := c.Request.URL.String()
+		// 拦截生成缩略图请求
+		if strings.HasPrefix(url, "/static/") && strings.Contains(url, "?imageView2") {
+			r := strings.SplitAfter(url, "imageView2")
+			size := strings.Split(r[1], "/")
+			if len(size) != 8 {
+				c.String(http.StatusNotFound, "invalid thumb args")
+				return
+			}
+			with := utils.IntValue(size[3], 0)
+			height := utils.IntValue(size[5], 0)
+			quality := utils.IntValue(size[7], 75)
+
+			// 打开图片文件
+			filePath := strings.TrimLeft(c.Request.URL.Path, "/")
+			file, err := os.Open(filePath)
+			if err != nil {
+				c.String(http.StatusNotFound, "Image not found")
+				return
+			}
+			defer file.Close()
+
+			// 解码图片
+			img, _, err := image.Decode(file)
+			// for .webp image
+			if err != nil {
+				img, err = webp.Decode(file)
+			}
+			if err != nil {
+				c.String(http.StatusInternalServerError, "Error decoding image")
+				return
+			}
+
+			var newImg image.Image
+			if height == 0 || with == 0 {
+				// 固定宽度，高度自适应
+				newImg = resize.Resize(uint(with), uint(height), img, resize.Lanczos3)
+			} else {
+				// 生成缩略图
+				newImg = resize.Thumbnail(uint(with), uint(height), img, resize.Lanczos3)
+			}
+			var buffer bytes.Buffer
+			err = jpeg.Encode(&buffer, newImg, &jpeg.Options{Quality: quality})
+			if err != nil {
+				c.String(http.StatusInternalServerError, err.Error())
+				return
+			}
+
+			// 设置图片缓存有效期为一年 (365天)
+			c.Header("Cache-Control", "max-age=31536000, public")
+			// 直接输出图像数据流
+			c.Data(http.StatusOK, "image/jpeg", buffer.Bytes())
+			c.Abort() // 中断请求
+
+		}
+		c.Next()
+	}
+}