Google Analytics script injection

Problem this snippet solves:

Add google analytics script in the html content of the HTTP response. Works also for other Analytics providers like Piwik.

How to use this snippet:

Installation

Files

The code below has to be imported as an ifile.

By default, you must name this ifile google.js but you can change it in the irule if required.

Google Analytics code :

<!-- Google Analytics -->
<script>
window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;
ga('create', '$static::tracking_id', 'auto');
ga('send', 'pageview');
</script>
<script async src='https://www.google-analytics.com/analytics.js'></script>
<!-- End Google Analytics -->

Piwik javascript code :

<!-- Piwik -->
<script type="text/javascript">
  var _paq = _paq || [];
  _paq.push(['trackPageView']);
  _paq.push(['enableLinkTracking']);
  (function() {
    var u="//$static::piwik_url/";
    _paq.push(['setTrackerUrl', u+'piwik.php']);
    _paq.push(['setSiteId', {$static::siteid}]);
    var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
    g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s);
  })();
</script>
<!-- End Piwik Code -->

irule

You need to install the irule on your Virtual Server.

Variables

set static::tracking_id "UA-XXXXX-Y"                            # replace the Google Tracking ID by your own
set static::siteid "UA-XXXXX-Y"                                 # replace the Piwik Site ID by your own
set static::piwik_url "https://www.mypiwik.com/piwik/piwik"     # replace the Piwik URL by your own

Features

Version 1.0

• Insert Google Analytics JS code within html response
• support for Piwik JS insertion
• Manage Multiple TrackingID by hostname (see Multiple "hostname and TrackingID section")

Backlog

• Add logging

External links

Github : https://github.com/e-XpertSolutions/f5

BONUS : Multiple hostname and TrackingID

Prerequisite

You need to add a string based Datagroup named HOST_TRACKING_MAPPING.

ltm data-group internal HOST_TRACKING_MAPPING {
    records {
        blog.e-xpertsolutions.com {
            data UA-XXXXX-Z
        }
        www.e-xpertsolutions.com {
            data UA-XXXXX-Y
        }
    }
    type string
}

The google.js ifile need to be replaced by the following example :

<!-- Google Analytics -->
<script>
    window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;
    ga('create', '$tracking_id', 'auto');
    ga('send', 'pageview');
</script>
<script async src='https://www.google-analytics.com/analytics.js'></script>
<!-- End Google Analytics -->

Irule

when RULE_INIT {
    set static::default_trackingid "UA-XXXXX-Y"
}

when HTTP_REQUEST {
    HTTP::header remove "Accept-Encoding"
    set host [HTTP::host]
}

when HTTP_RESPONSE {
    if { [HTTP::header Content-Type] contains "text/html" } {
        if { [HTTP::header exists "Content-Length"] } {
            set content_length [HTTP::header "Content-Length"]
        } else {
            set content_length 1000000
        }
        if { $content_length > 0 } {
            HTTP::collect $content_length
        }
    }
}
when HTTP_RESPONSE_DATA { 
    set search "</head>"
    set tracking_id [class match -value -- $host equals HOST_TRACKING_MAPPING]
    if { $tracking_id eq "" } {
        set tracking_id $static::default_trackingid
    }
    HTTP::payload replace 0 $content_length [string map [list $search "[subst -nocommands -nobackslashes [ifile get google.js]]</head>"] [HTTP::payload]]
    HTTP::release
}

Code :

when RULE_INIT {
set static::tracking_id "UA-XXXXX-Y"
set static::siteid "XXXXX"
set static::piwik_url "https://www.piwik.url/piwik/piwik"
}

when HTTP_REQUEST {
HTTP::header remove "Accept-Encoding"
}

when HTTP_RESPONSE {
if { [HTTP::header Content-Type] contains "text/html" } {
if { [HTTP::header exists "Content-Length"] } {
set content_length [HTTP::header "Content-Length"]
} else {
set content_length 1000000
}
if { $content_length > 0 } {
HTTP::collect $content_length
}
}
}
when HTTP_RESPONSE_DATA { 
    set search ""
    HTTP::payload replace 0 $content_length [string map [list $search "[subst -nocommands -nobackslashes [ifile get google.js]]"] [HTTP::payload]]
    HTTP::release
}

Tested this on version:

11.5