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package middleware
import (
"fmt"
"time"
gltime "code.crute.us/mcrute/golib/time"
"github.com/labstack/echo/v4"
)
var (
CacheNeverMiddleware = CacheHeadersMiddleware(0)
CacheOneHourMiddleware = CacheHeadersMiddleware(1 * time.Hour)
CacheOneDayMiddleware = CacheHeadersMiddleware(1 * gltime.Day)
CacheOneMonthMiddleware = CacheHeadersMiddleware(30 * gltime.Day)
)
func setHeaderMissing(c echo.Context, name string, value string) {
h := c.Response().Header()
if v := h.Get(name); v == "" {
h.Set(name, value)
}
}
func CacheHeadersMiddleware(d time.Duration) echo.MiddlewareFunc {
ds := int(d.Seconds())
return func(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
c.Response().Header().Add(echo.HeaderVary, "Accept-Encoding")
if ds == 0 {
setHeaderMissing(c, "Cache-Control", "private, max-age=0, no-cache, no-store")
setHeaderMissing(c, "Expires", time.Now().Add(-time.Hour).Format(time.RFC1123))
} else {
setHeaderMissing(c, "Cache-Control", fmt.Sprintf("public, max-age=%d", ds))
setHeaderMissing(c, "Expires", time.Now().Add(d).Format(time.RFC1123))
}
return next(c)
}
}
}
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