Js lib getting

[hypesystem]

This adds an endpoint /lib/:projectId/openlytics.js which exposes a javascript script.

If the script is included in a page as <script src="{{ openlyticsUrl }}/lib/:projectId/openlytics.js"></script>, it registers an object openlytics with a single method pageview(), which sends off a pageview.

Eg., this code could be included on a client page:

<script src="https://myopenlytics.example.com/lib/my-project/openlytics.js"></script>
<script>
openlytics.pageview();
</script>

The script automatically gets the right URL (although I didn't know how to guess http/https for now) for openlytics, and includes the project ID in the script. This gives us a much neater JS interface than Google Analytics on the client side 😄

cc @Arth101 because this might interest you.

[hypesystem]

I have realized that we can do somewhat better than this.

No need for userId in frontend. We will always be sending user agent and IP anyway. So let's hash those as a userId upon reception, together with the source host and forget them. (Save only the hash.)