public PrplMiddleware(RequestDelegate next, string root, IOptions <PrplConfiguration> options, IHostingEnvironment env)
{
_next = next;
_root = Path.Combine(env.ContentRootPath, root);
_config = options.Value;
_builds = LoadBuilds();
}
static Build[] LoadBuilds(string root, PrplConfiguration config)
{
return(config.Builds.Select((b, i) => new Build(Path.Combine(root, b.Name), root)
{
ConfigOrder = i,
Name = b.Name,
Requirements = new HashSet <BrowserCapability>(b.BrowserCapabilities ?? new BrowserCapability[] { }),
EntryPoint = b.EntryPoint,
}).OrderBy(bb => bb).ToArray());
}
static Action <StaticFileResponseContext> PrepareStaticFiles(PrplConfiguration config, Build build)
{
return((StaticFileResponseContext ctx) =>
{
if (ctx.File.Name.EndsWith("service-worker.js", StringComparison.Ordinal))
{
// A service worker may only register with a scope above its own path if
// permitted by this header.
// https://www.w3.org/TR/service-workers-1/#service-worker-allowed
ctx.Context.Response.Headers["service-worker-allowed"] = "/";
}
// Don't set the Cache-Control header if it's already set. This way another
// middleware can control caching, and we won't touch it.
if (!ctx.Context.Response.Headers["Cache-Control"].Any())
{
ctx.Context.Response.Headers["Cache-Control"] = ctx.File.Name == build.EntryPoint ? "max-age=0"
: config.CacheControl;
}
if (build.PushManifest != null)
{
var urlPath = ctx.Context.Request.Path;
var linkHeaders = new List <string>();
var appRouteFeature = ctx.Context.Features.Get <ApplicationRouteFeature>();
if (appRouteFeature != null && !string.IsNullOrEmpty(appRouteFeature.Path))
{
// Also check the filename against the push manifest. In the case of
// the entrypoint, these will be different (e.g. "/my/app/route" vs
// "/es2015/index.html"), and we want to support configuring pushes in
// terms of both.
linkHeaders.AddRange(build.PushManifest.LinkHeaders(appRouteFeature.Path));
}
linkHeaders.AddRange(build.PushManifest.LinkHeaders(urlPath));
ctx.Context.Response.Headers.Add("Link", linkHeaders.ToArray());
}
});
}
