apiVersion: v1
kind: ConfigMap
metadata:
  name: varnish-config
  namespace: magento
data:
  VARNISH_LISTEN_HOST: varnish-service.magento.svc.cluster.local
  VARNISH_LISTEN_PORT: "8081"
  VARNISH_BACKEND_HOST: magento-service.magento.svc.cluster.local
  VARNISH_BACKEND_PORT: "8080"
  VARNISH_STORAGE: "malloc,512M"
  default.vcl: |
    # VCL version 5.0 is not supported so it should be 4.0 even though actually used Varnish version is 6
    vcl 4.0;

    import std;
    # The minimal Varnish version is 6.0
    # For SSL offloading, pass the following header in your proxy server or load balancer: 'X-Forwarded-Proto: https'

    backend default {
        .host = "magento-service.magento.svc.cluster.local";
        .port = "8080";
        .first_byte_timeout = 600s;
    }

    acl purge {
        "varnish-service.magento.svc.cluster.local";
    }

    sub vcl_recv {
        if (req.restarts > 0) {
            set req.hash_always_miss = true;
        }

        if (req.method == "PURGE") {
            if (client.ip !~ purge) {
                return (synth(405, "Method not allowed"));
            }
            # To use the X-Pool header for purging varnish during automated deployments, make sure the X-Pool header
            # has been added to the response in your backend server config. This is used, for example, by the
            # capistrano-magento2 gem for purging old content from varnish during its deploy routine.
            if (!req.http.X-Magento-Tags-Pattern && !req.http.X-Pool) {
                return (synth(400, "X-Magento-Tags-Pattern or X-Pool header required"));
            }
            if (req.http.X-Magento-Tags-Pattern) {
            ban("obj.http.X-Magento-Tags ~ " + req.http.X-Magento-Tags-Pattern);
            }
            if (req.http.X-Pool) {
            ban("obj.http.X-Pool ~ " + req.http.X-Pool);
            }
            return (synth(200, "Purged"));
        }

        if (req.method != "GET" &&
            req.method != "HEAD" &&
            req.method != "PUT" &&
            req.method != "POST" &&
            req.method != "TRACE" &&
            req.method != "OPTIONS" &&
            req.method != "DELETE") {
            /* Non-RFC2616 or CONNECT which is weird. */
            return (pipe);
        }

        # We only deal with GET and HEAD by default
        if (req.method != "GET" && req.method != "HEAD") {
            return (pass);
        }

        # Bypass search requests, shopping cart, checkout
        if (req.url ~ "/catalogsearch" || req.url ~ "/checkout") {
            return (pass);
        }

        # Bypass health check requests
        if (req.url ~ "^/(pub/)?(health_check.php)$") {
            return (pass);
        }

        # Set initial grace period usage status
        set req.http.grace = "none";

        # normalize url in case of leading HTTP scheme and domain
        set req.url = regsub(req.url, "^http[s]?://", "");

        # collect all cookies
        std.collect(req.http.Cookie);

        # Compression filter. See https://www.varnish-cache.org/trac/wiki/FAQ/Compression
        if (req.http.Accept-Encoding) {
            if (req.url ~ "\.(jpg|jpeg|png|gif|gz|tgz|bz2|tbz|mp3|ogg|swf|flv|svg)$") {
                # No point in compressing these
                unset req.http.Accept-Encoding;
            } elsif (req.http.Accept-Encoding ~ "gzip") {
                set req.http.Accept-Encoding = "gzip";
            } elsif (req.http.Accept-Encoding ~ "deflate" && req.http.user-agent !~ "MSIE") {
                set req.http.Accept-Encoding = "deflate";
            } else {
                # unknown algorithm
                unset req.http.Accept-Encoding;
            }
        }

        # Remove all marketing get parameters to minimize the cache objects
        if (req.url ~ "(\?|&)(gclid|cx|ie|cof|siteurl|zanpid|origin|fbclid|mc_[a-z]+|utm_[a-z]+|_bta_[a-z]+)=") {
            set req.url = regsuball(req.url, "(gclid|cx|ie|cof|siteurl|zanpid|origin|fbclid|mc_[a-z]+|utm_[a-z]+|_bta_[a-z]+)=[-_A-z0-9+()%.]+&?", "");
            set req.url = regsub(req.url, "[?|&]+$", "");
        }

        # Static files caching
        if (req.url ~ "^/(pub/)?(media|static)/") {
            # Static files should not be cached by default
            return (pass);

            # But if you use a few locales and dont use CDN you can enable caching static files by commenting previous line (#return (pass);) and uncommenting next 3 lines
            #unset req.http.Https;
            #unset req.http.X-Forwarded-Proto;
            #unset req.http.Cookie;
        }

        # Bypass authenticated GraphQL requests without a X-Magento-Cache-Id
        if (req.url ~ "/graphql" && !req.http.X-Magento-Cache-Id && req.http.Authorization ~ "^Bearer") {
            return (pass);
        }

        return (hash);
    }

    sub vcl_hash {
        if ((req.url !~ "/graphql" || !req.http.X-Magento-Cache-Id) && req.http.cookie ~ "X-Magento-Vary=") {
            hash_data(regsub(req.http.cookie, "^.*?X-Magento-Vary=([^;]+);*.*$", "\1"));
        }

        # To make sure http users dont see ssl warning
        if (req.http.X-Forwarded-Proto) {
            hash_data(req.http.X-Forwarded-Proto);
        }
        

        if (req.url ~ "/graphql") {
            call process_graphql_headers;
        }
    }

    sub process_graphql_headers {
        if (req.http.X-Magento-Cache-Id) {
            hash_data(req.http.X-Magento-Cache-Id);

            # When the frontend stops sending the auth token, make sure users stop getting results cached for logged-in users
            if (req.http.Authorization ~ "^Bearer") {
                hash_data("Authorized");
            }
        }

        if (req.http.Store) {
            hash_data(req.http.Store);
        }

        if (req.http.Content-Currency) {
            hash_data(req.http.Content-Currency);
        }
    }

    sub vcl_backend_response {

        set beresp.grace = 3d;

        if (beresp.http.content-type ~ "text") {
            # set beresp.do_esi = true;
        }

        if (bereq.url ~ "\.js$" || beresp.http.content-type ~ "text") {
            set beresp.do_gzip = true;
        }

        if (beresp.http.X-Magento-Debug) {
            set beresp.http.X-Magento-Cache-Control = beresp.http.Cache-Control;
        }

        # cache only successfully responses and 404s
        if (beresp.status != 200 && beresp.status != 404) {
            set beresp.ttl = 0s;
            set beresp.uncacheable = true;
            return (deliver);
        } elsif (beresp.http.Cache-Control ~ "private") {
            set beresp.uncacheable = true;
            set beresp.ttl = 86400s;
            return (deliver);
        }

        # validate if we need to cache it and prevent from setting cookie
        if (beresp.ttl > 0s && (bereq.method == "GET" || bereq.method == "HEAD")) {
            # Collapse beresp.http.set-cookie in order to merge multiple set-cookie headers
            # Although it is not recommended to collapse set-cookie header,
            # it is safe to do it here as the set-cookie header is removed below
            std.collect(beresp.http.set-cookie);
            # Do not cache the response under current cache key (hash),
            # if the response has X-Magento-Vary but the request does not.
            if ((bereq.url !~ "/graphql" || !bereq.http.X-Magento-Cache-Id)
            && bereq.http.cookie !~ "X-Magento-Vary="
            && beresp.http.set-cookie ~ "X-Magento-Vary=") {
            set beresp.ttl = 0s;
            set beresp.uncacheable = true;
            }
            unset beresp.http.set-cookie;
        }

        # If page is not cacheable then bypass varnish for 2 minutes as Hit-For-Pass
        if (beresp.ttl <= 0s ||
            beresp.http.Surrogate-control ~ "no-store" ||
            (!beresp.http.Surrogate-Control &&
            beresp.http.Cache-Control ~ "no-cache|no-store") ||
            beresp.http.Vary == "*") {
            # Mark as Hit-For-Pass for the next 2 minutes
            set beresp.ttl = 120s;
            set beresp.uncacheable = true;
        }

        # If the cache key in the Magento response doesnt match the one that was sent in the request, don't cache under the request's key
        if (bereq.url ~ "/graphql" && bereq.http.X-Magento-Cache-Id && bereq.http.X-Magento-Cache-Id != beresp.http.X-Magento-Cache-Id) {
            set beresp.ttl = 0s;
            set beresp.uncacheable = true;
        }

        return (deliver);
    }

    sub vcl_deliver {
        if (resp.http.X-Magento-Debug) {
            if (resp.http.x-varnish ~ " ") {
                set resp.http.X-Magento-Cache-Debug = "HIT";
                set resp.http.Grace = req.http.grace;
            } else {
                set resp.http.X-Magento-Cache-Debug = "MISS";
            }
        } else {
            unset resp.http.Age;
        }

        # Not letting browser to cache non-static files.
        if (resp.http.Cache-Control !~ "private" && req.url !~ "^/(pub/)?(media|static)/") {
            set resp.http.Pragma = "no-cache";
            set resp.http.Expires = "-1";
            set resp.http.Cache-Control = "no-store, no-cache, must-revalidate, max-age=0";
        }

        if (!resp.http.X-Magento-Debug) {
            unset resp.http.Age;
        }

        unset resp.http.X-Magento-Debug;
        unset resp.http.X-Magento-Tags;
        unset resp.http.X-Powered-By;
        unset resp.http.Server;
        unset resp.http.X-Varnish;
        unset resp.http.Via;
        unset resp.http.Link;
    }

    sub vcl_hit {
        if (obj.ttl >= 0s) {
            # Hit within TTL period
            return (deliver);
        }
        if (std.healthy(req.backend_hint)) {
            if (obj.ttl + 300s > 0s) {
                # Hit after TTL expiration, but within grace period
                set req.http.grace = "normal (healthy server)";
                return (deliver);
            } else {
                # Hit after TTL and grace expiration
                return (restart);
            }
        } else {
            # server is not healthy, retrieve from cache
            set req.http.grace = "unlimited (unhealthy server)";
            return (deliver);
        }
    }
