66 lines
2.1 KiB
Go
66 lines
2.1 KiB
Go
package middleware
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import (
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"github.com/gin-gonic/gin"
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"strings"
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"time"
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)
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// StaticCacheMiddleware add embed file static cache
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func StaticCacheMiddleware() gin.HandlerFunc {
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return func(c *gin.Context) {
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path := c.Request.URL.Path
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// 对静态资源应用缓存策略
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if strings.HasPrefix(path, "/assets/") || strings.Contains(path, "/assets/") {
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// 检查文件类型
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if isVersionedAsset(path) {
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// 带版本号的资源（如 index-Bw4BKttg.js）可以长期缓存
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// 使用 immutable 指令，浏览器在缓存期内不会重新验证
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c.Header("Cache-Control", "public, max-age=31536000, immutable")
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} else {
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// 其他静态资源使用较短的缓存时间
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c.Header("Cache-Control", "public, max-age=86400")
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}
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// 添加 ETag 支持
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c.Header("ETag", `"`+path+`"`)
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// 添加 Expires 头（兼容旧浏览器）
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expires := time.Now().Add(24 * time.Hour).UTC().Format(time.RFC1123)
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c.Header("Expires", expires)
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// 添加 Vary 头，告诉缓存服务器根据这些头部区分缓存
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c.Header("Vary", "Accept-Encoding")
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} else if path == "/" || strings.HasSuffix(path, ".html") {
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// HTML 文件不缓存或使用协商缓存
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c.Header("Cache-Control", "no-cache, must-revalidate")
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c.Header("Pragma", "no-cache")
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c.Header("Expires", "0")
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}
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// Continue to the next middleware or handler
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c.Next()
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}
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}
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// isVersionedAsset 检查是否是带版本号的资源文件
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// Vite 构建的文件通常包含 hash，如：index-Bw4BKttg.js
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func isVersionedAsset(path string) bool {
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// 检查是否包含 hash 模式（通常是 -[hash].js 或 -[hash].css）
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return strings.Contains(path, "-") &&
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(strings.HasSuffix(path, ".js") ||
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strings.HasSuffix(path, ".css") ||
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strings.HasSuffix(path, ".woff") ||
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strings.HasSuffix(path, ".woff2") ||
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strings.HasSuffix(path, ".ttf") ||
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strings.HasSuffix(path, ".eot") ||
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strings.HasSuffix(path, ".svg") ||
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strings.HasSuffix(path, ".png") ||
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strings.HasSuffix(path, ".jpg") ||
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strings.HasSuffix(path, ".jpeg") ||
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strings.HasSuffix(path, ".gif") ||
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strings.HasSuffix(path, ".webp") ||
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strings.HasSuffix(path, ".ico"))
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}
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