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refactor(api): cache api responses

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Collin Barrett 2025-05-31 21:11:17 -05:00 committed by Collin Barrett
parent ec1e006dc8
commit d5a755f2ba
2 changed files with 49 additions and 0 deletions
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48
services/Directory/FilterLists.Directory.Api/CacheMiddleware.cs Normal file
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@ -0,0 +1,48 @@
namespace FilterLists.Directory.Api;
internal class CachingMiddleware(RequestDelegate next, CachingMiddlewareOptions options)
{
public async Task InvokeAsync(HttpContext context)
{
await next(context);
if (ShouldApplyCachingHeaders(context))
{
context.Response.Headers.CacheControl =
$"public, s-maxage={options.SharedCacheMaxAgeSeconds}, max-age={options.ClientCacheMaxAgeSeconds}";
if (options.AddExpiresHeader)
context.Response.Headers.Expires =
DateTime.UtcNow.AddSeconds(options.SharedCacheMaxAgeSeconds).ToString("R");
}
}
private bool ShouldApplyCachingHeaders(HttpContext context)
{
return context.Request.Path.StartsWithSegments(options.ApiPathPrefix) &&
context.Request.Method == HttpMethods.Get &&
context.Response.StatusCode >= 200 &&
context.Response.StatusCode < 300 &&
!context.Response.Headers.ContainsKey("Cache-Control");
}
}
internal record CachingMiddlewareOptions
{
public string ApiPathPrefix { get; set; } = "/api";
public int SharedCacheMaxAgeSeconds { get; set; } = 24 * 60 * 60; // Default 1 day
public int ClientCacheMaxAgeSeconds { get; set; } = 1 * 60 * 60; // Default 1 hour
public bool AddExpiresHeader { get; set; }
}
internal static class CachingMiddlewareExtensions
{
public static IApplicationBuilder UseCustomApiCaching(
this IApplicationBuilder builder,
Action<CachingMiddlewareOptions>? configureOptions = null)
{
var options = new CachingMiddlewareOptions();
configureOptions?.Invoke(options);
return builder.UseMiddleware<CachingMiddleware>(options);
}
}

1
services/Directory/FilterLists.Directory.Api/Program.cs
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@ -16,6 +16,7 @@
app.UseExceptionHandler();
app.UseCors();
app.UseCustomApiCaching();
app.MapEndpoints();
app.MapDefaultEndpoints();
app.UseSwagger(o => o.RouteTemplate = "{documentName}/openapi.json");