77 lines
1.9 KiB
Go
77 lines
1.9 KiB
Go
package middleware
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"net/http"
|
|
"time"
|
|
|
|
"github.com/mikestefanello/pagoda/pkg/context"
|
|
"github.com/mikestefanello/pagoda/pkg/log"
|
|
"github.com/mikestefanello/pagoda/pkg/services"
|
|
|
|
libstore "github.com/eko/gocache/lib/v4/store"
|
|
"github.com/labstack/echo/v4"
|
|
)
|
|
|
|
// ServeCachedPage attempts to load a page from the cache by matching on the complete request URL
|
|
// If a page is cached for the requested URL, it will be served here and the request terminated.
|
|
// Any request made by an authenticated user or that is not a GET will be skipped.
|
|
func ServeCachedPage(t *services.TemplateRenderer) echo.MiddlewareFunc {
|
|
return func(next echo.HandlerFunc) echo.HandlerFunc {
|
|
return func(ctx echo.Context) error {
|
|
// Skip non GET requests
|
|
if ctx.Request().Method != http.MethodGet {
|
|
return next(ctx)
|
|
}
|
|
|
|
// Skip if the user is authenticated
|
|
if ctx.Get(context.AuthenticatedUserKey) != nil {
|
|
return next(ctx)
|
|
}
|
|
|
|
// Attempt to load from cache
|
|
page, err := t.GetCachedPage(ctx, ctx.Request().URL.String())
|
|
|
|
if err != nil {
|
|
switch {
|
|
case errors.Is(err, &libstore.NotFound{}):
|
|
case context.IsCanceledError(err):
|
|
return nil
|
|
default:
|
|
log.Ctx(ctx).Error("failed getting cached page",
|
|
"error", err,
|
|
)
|
|
}
|
|
|
|
return next(ctx)
|
|
}
|
|
|
|
// Set any headers
|
|
if page.Headers != nil {
|
|
for k, v := range page.Headers {
|
|
ctx.Response().Header().Set(k, v)
|
|
}
|
|
}
|
|
|
|
log.Ctx(ctx).Debug("serving cached page")
|
|
|
|
return ctx.HTMLBlob(page.StatusCode, page.HTML)
|
|
}
|
|
}
|
|
}
|
|
|
|
// CacheControl sets a Cache-Control header with a given max age
|
|
func CacheControl(maxAge time.Duration) echo.MiddlewareFunc {
|
|
return func(next echo.HandlerFunc) echo.HandlerFunc {
|
|
return func(ctx echo.Context) error {
|
|
v := "no-cache, no-store"
|
|
if maxAge > 0 {
|
|
v = fmt.Sprintf("public, max-age=%.0f", maxAge.Seconds())
|
|
}
|
|
ctx.Response().Header().Set("Cache-Control", v)
|
|
return next(ctx)
|
|
}
|
|
}
|
|
}
|