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