vcl 4.1;

backend default {
    .host = "ghost";
    .port = "2368";
}

sub vcl_recv {
    # Normalize the Host header
    if (req.http.host ~ "^www\.") {
        return (synth(750, ""));
    }

    # Don't cache the admin panel or API
    if (req.url ~ "^/ghost/" || req.url ~ "^/ghost-api/") {
        return (pass);
    }
}

sub vcl_synth {
    if (resp.status == 750) {
        set resp.status = 301;
        set resp.http.Location = "https://speedyweedyops.org" + req.url;
        return(deliver);
    }
}

sub vcl_backend_response {
    # Cache everything for 1 hour by default
    set beresp.ttl = 1h;

    # Don't cache responses with these headers
    if (beresp.http.Set-Cookie || beresp.http.Vary == "*") {
        set beresp.uncacheable = true;
        return (deliver);
    }

    # Don't cache responses for authenticated users
    if (beresp.http.Cache-Control ~ "private") {
        set beresp.uncacheable = true;
        return (deliver);
    }
}

sub vcl_deliver {
    # Add a custom header to indicate cache hit/miss
    if (obj.hits > 0) {
        set resp.http.X-Cache = "HIT";
    } else {
        set resp.http.X-Cache = "MISS";
    }
}