Wednesday, 1 November 2017

Using a CDN for Custom User Actions

Problem:  I need to inject JavaScript into a couple of hundred thousand site collections and sub sites using a Custom User Action.  I want to used a CDN.  Governance will not let me add to the layouts folder on the WFE's.  Using a CDN for a CUA is causing the blank page.

Initial Hypothesis:  I don't want to deploy the same JS file hundreds of thousands of times into the local site collections.  As updating and storage is crazy.  I want a CDN like behaviour and the closest I can get is to modify the hive directory on each SharePoint on-prem. farm that allows me to reference the JS.  I do have several farms and IT governance won't allow me to modify the WFE's.

Tobias Lekman has a good comprehensive overview of the CUA issue:
https://blog.lekman.com/2013/01/scriptlink-registration-in-sharepoint.html

Doing the usual testing, bizarrely I can use anonymous https://radimaging.sharepoint.com/_layouts/15/guestaccess.aspx?docid=55529eccf4555d698555cb26108fb555&authkey=555-6M9555zF555g555 for my CUA JS file.
When I allow external access on my personal public O365 E3 tenant, I can use this url, the CUA works perfectly.  My client does not have a Office 365 external public tenant I can use so an Akamai (or another CDN)CDN and fake the validation.  It's either SP url validated or I need to load it differently if I want to use a CDN.  I used an Akamai CDN and added /_layouts/15/ into the url using folders and the CDN started working for my CUA. e.g. https://cdn.domain.com/sharepoint/_layouts/15/cuatest.js

Possible Resolution:

  1. Local Site Collection uploaded files
  2. CDN assuming the JS location has: 

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