Integration with Netlify for purging the CDN (assets) cache.
When specific actions happen (for now the image style flush hook is implemented) that could affect resources (for example images) which are stored on netlify, and they are tagged with specific cache tags, then those cache tags get invalidated.
As mentioned, this module, out of the box, provides an implementation for the image style flush hook in netlify_cdn_image_style_flush(), which is also a very good example on how possibly other custom code could flag specific tags to be invalidated.
There is no particular configuration form for this module, everything gets configured through environment variables because the only things needed at the moment for this module are netlify credentials.
To validate resources on a netlify site, we need two types of credentials: an auth token and a site id. For the same auth token, we can have also multiple site ids.
This module is able to purge cache on multiple site ids which can use different auth tokens a well.
Each individual auth token needs to have an env variable which has the "NETLIFYCDN_AUTH_TOKEN" prefix, for example: "NETLIFY_CDN_AUTH_TOKEN_ANIMALS". Then, each of the site ids which belong to the above-mentioned token needs to have the env variable name prefixed with "NETLIFYCDN_SITE_ID_ANIMALS", for example: "NETLIFY_CDN_SITE_ID_ANIMALS_CAT", "NETLIFY_CDN_SITE_ID_ANIMALS_DOG".
As a summary, here is how a possible configuration of env variables would look like for multiple tokens and multiple sites:
- NETLIFY_CDN_AUTH_TOKEN_ANIMALS
- NETLIFY_CDN_SITE_ID_ANIMALS_CAT
- NETLIFY_CDN_SITE_ID_ANIMALS_DOG
- NETLIFY_CDN_AUTH_TOKEN_TREES
- NETLIFY_CDN_SITE_ID_TREES_OAK
- NETLIFY_CDN_SITE_ID_TREES_PINE