NAME

       vmod_cookie - Varnish Cookie Module

SYNOPSIS

       import cookie [from "path"] ;

DESCRIPTION

       Handle HTTP cookies easier in Varnish VCL. (without regex)

       Parses  a  cookie  header  into  an  internal  data  store, where per-cookie get/set/delete functions are
       available. A filter_except() method removes all but a set comma-separated list  of  cookies.  A  filter()
       method removes a comma- separated list of cookies.

       A  convenience  function  for formatting the Set-Cookie Expires date field is also included. If there are
       multiple Set-Cookie headers vmod-header should be used.

       The state loaded with cookie.parse() has a lifetime of the current request or backend request context. To
       pass variables to the backend request, store the contents as fake bereq headers.

       Filtering example:

          vcl 4.0;

          import cookie;

          backend default { .host = "192.0.2.11"; .port = "8080"; }

          sub vcl_recv {
              if (req.http.cookie) {
                  cookie.parse(req.http.cookie);
                  # Either delete the ones you want to get rid of:
                  cookie.delete("cookie2");
                  # or filter everything but a few:
                  cookie.filter_except("SESSIONID,PHPSESSID");

                  # Store it back into req so it will be passed to the backend.
                  set req.http.cookie = cookie.get_string();

                  # If empty, unset so the builtin VCL can consider it for caching.
                  if (req.http.cookie == "") {
                      unset req.http.cookie;
                  }
              }
          }

CONTENTS

       • VOID clean(PRIV_TASK)

       • VOID delete(PRIV_TASK, STRING)

       • VOID filter(PRIV_TASK, STRING)

       • VOID filter_except(PRIV_TASK, STRING)

       • STRING format_rfc1123(TIME, DURATION)

       • STRING get(PRIV_TASK, STRING)

       • STRING get_string(PRIV_TASK)

       • BOOL isset(PRIV_TASK, STRING)

       • VOID parse(PRIV_TASK, STRING)

       • VOID set(PRIV_TASK, STRING, STRING)

   clean
          VOID clean(PRIV_TASK)

       Description
              Clean up previously parsed cookies. It is not necessary to run clean() in normal operations.

       Example

                 sub vcl_recv {
                         cookie.clean();
                 }

   delete
          VOID delete(PRIV_TASK, STRING cookiename)

       Description
              Delete cookiename from internal vmod storage if it exists.

       Example

                 sub vcl_recv {
                     cookie.parse("cookie1: value1; cookie2: value2;");
                     cookie.delete("cookie2");
                     // get_string() will now yield "cookie1: value1";
                 }

   filter
          VOID filter(PRIV_TASK, STRING filterstring)

       Description
              Delete  all  cookies  from  internal  vmod  storage  that  are  in  the  comma-separated  argument
              cookienames.

       Example

                 sub vcl_recv {
                         cookie.parse("cookie1: value1; cookie2: value2; cookie3: value3");
                         cookie.filter("cookie1,cookie2");
                         // get_string() will now yield
                         // "cookie3: value3";
                 }

   filter_except
          VOID filter_except(PRIV_TASK, STRING filterstring)

       Description
              Delete  all  cookies  from  internal  vmod  storage  that  is  not in the comma-separated argument
              cookienames.

       Example

                 sub vcl_recv {
                         cookie.parse("cookie1: value1; cookie2: value2; cookie3: value3");
                         cookie.filter_except("cookie1,cookie2");
                         // get_string() will now yield
                         // "cookie1: value1; cookie2: value2;";
                 }

   format_rfc1123
          STRING format_rfc1123(TIME now, DURATION timedelta)

       Description
              Get a RFC1123 formatted date string suitable for inclusion in a Set-Cookie response header.

              Care should be taken if the response has multiple Set-Cookie headers.  In  that  case  the  header
              vmod should be used.

       Example

                 sub vcl_deliver {
                         # Set a userid cookie on the client that lives for 5 minutes.
                         set resp.http.Set-Cookie = "userid=" + req.http.userid + "; Expires=" + cookie.format_rfc1123(now, 5m) + "; httpOnly";
                 }

   get
          STRING get(PRIV_TASK, STRING cookiename)

       Description
              Get  the  value of cookiename, as stored in internal vmod storage. If cookiename does not exist an
              empty string is returned.

       Example

                 import std;
                 sub vcl_recv {
                         cookie.parse("cookie1: value1; cookie2: value2;");
                         std.log("cookie1 value is: " + cookie.get("cookie1"));
                 }

   get_string
          STRING get_string(PRIV_TASK)

       Description
              Get a Cookie string value with all cookies in internal vmod  storage.  Does  not  modify  internal
              storage.

       Example

                 sub vcl_recv {
                         cookie.parse(req.http.cookie);
                         cookie.filter_except("SESSIONID,PHPSESSID");
                         set req.http.cookie = cookie.get_string();
                 }

   isset
          BOOL isset(PRIV_TASK, STRING cookiename)

       Description
              Check if cookiename is set in the internal vmod storage.

       Example

                 import std;
                 sub vcl_recv {
                         cookie.parse("cookie1: value1; cookie2: value2;");
                         if (cookie.isset("cookie2")) {
                                 std.log("cookie2 is set.");
                         }
                 }

   parse
          VOID parse(PRIV_TASK, STRING cookieheader)

       Description
              Parse the cookie string in cookieheader. If state already exists, clean() will be run first.

       Example

                 sub vcl_recv {
                         cookie.parse(req.http.Cookie);
                 }

   set
          VOID set(PRIV_TASK, STRING cookiename, STRING value)

       Description
              Set the internal vmod storage for cookiename to value.

       Example

                 sub vcl_recv {
                         cookie.set("cookie1", "value1");
                         std.log("cookie1 value is: " + cookie.get("cookie1"));
                 }

                                                                                                  VMOD_COOKIE(3)