[Admin, Base] Add theme colors to different environments

[loetie]

To quickly distinguish if a user is on acceptance or production (or developers on dev and test)

[mworrell]

For discerning the live/testing/staging, maybe we could add a colored bar at the top or one of the sides? Another option is to add a 'theme' class to the admin, so that we always echo that configured class name in the body tag (within the admin). Then you can add some css to change colors and/or some texts.

[ddeboer]

To make the environment (i.e. theme) selection more generic, we could base it on a server configuration variable (in zotonic.config).

[mworrell]

Yes, that is a good idea. At least something that can completely overruled by the server configuration.

We can then fetch it using m.site.environment.

In this way it is still possible to have a not-yet-live site on a production server, and switch it to production in a very visible way.

[mworrell]

In the code I see the following possible stages:

• dev
• test
• acceptance
• production

Checking DTAP (https://en.wikipedia.org/wiki/Development,_testing,_acceptance_and_production) I see:

• Development
• Test
• Acceptance
• Production
• Education (for learning the environment by new users)
• Backup (a backup site for disaster recovery)

Shall we use these names for possible values?

[mworrell]

Proposal:

1. Add zotonic.config setting environment (possible values, see above)
2. Add optional site configuration environment (overrules 1, so is possible to have a backup or education site on production server)
3. Add m.site.environment which echos the current environment, defaults to production
4. Set a class environment-{{ m.site.environment }} on the html tag in admin and other Zotonic base templates (idem for Ginger base templates)
5. Set a HTTP response header: X-DTAP-Environment: ... reflecting the current environment.

[mworrell]

I added an issue for Zotonic here: https://github.com/zotonic/zotonic/issues/2120

[mworrell]

See the merge request here: https://github.com/zotonic/zotonic/pull/2137

[mworrell]

The merge request in Zotonic is awaiting acceptance.