Varnish Cache Plus (Enterprise) configuration for Gradle HTTP Build Cache

gradle-cache.vcl

vcl 4.1;

import purge;
import std;
import synthbackend;

sub vcl_recv {
    if (req.method != "GET" && req.method != "PUT" && req.method != "DELETE") {
        return (synth(405));
    }
    if (req.url !~ "^/cache/[^/]*$") {
        return (synth(404));
    }
    if (req.method == "PUT") {
        if (req.http.user-agent !~ "^Gradle") {
            return (synth(400));
        }
        if (req.http.content-type !~ "^application/vnd.gradle.build-cache-artifact") {
            return (synth(415));
        }
        if (req.http.content-length) {
            // In later releases
            // if (std.bytes(req.http.content-length) > 10MB) {
            if (std.integer(req.http.content-length, 0) > 10485760) {
                return (synth(413));
            }
        } else if (!std.cache_req_body(10MB)) {
            return (synth(413));
        }

        set req.http.put-method = true;
        return (hash);
    }
    return (hash);
}

sub vcl_synth {
    return (deliver);
}

sub vcl_hit {
    if (req.http.put-method) {
        return (synth(200));
    }
}

sub vcl_miss {
    if (req.method == "GET") {
        return (synth(404));
    }
}

sub vcl_backend_fetch {
    if (bereq.http.put-method) {
        set bereq.method = "PUT";
        set bereq.backend = synthbackend.mirror();
        return (fetch);
    }
}

sub vcl_backend_response {
    set beresp.ttl = 30d;
    set beresp.grace = 0s;
    set beresp.keep = 0s;
    set beresp.http.Content-Type = bereq.http.Content-Type;
}

sub vcl_deliver {
    if (req.http.put-method) {
        return (synth(201));
    }
}