This removes some code which is duplicative and obscure (ie it’s not
very clear why we do `"a" * 73` even though there is a Very Good Reason
for doing so).
We were getting all letter logos from a method in the email branding
client. Since we will be adding more client methods to deal with
letters, it makes things clearer to separate the email and letter
branding clients.
When a user creates a service we can take a pretty good guess at what
organisation they’re from.
For many organisations, especially local councils, GOV.UK branding is
not appropriate for their service. But right now every service:
- gets created with GOV.UK branding
- has to ask us to change it, even if they’ve already done so for other
services they run
This commit starts using the `domain` field on the email branding table
to lookup what email branding to assign to a service automatically,
where we’re sure there’s a sensible default.
If we’re going to be referring to email branding as part of the service
creation journey then we should make sure it doesn’t slow things down
too much by adding an extra API call. Caching things in Redis is a way
of avoiding unneeded API calls.
Currently requests to the API made from the admin app are going from
PaaS admin app to the nginx router ELB, which then routes them back
to the api app on PaaS.
This makes sense for external requests, but for requests made from
the admin app we could skip nginx and go directly to the api PaaS
host, which should reduce load on the nginx instances and
potentially reduce latency of the api requests.
API apps on PaaS are checking the X-Custom-Forwarder header (which
is set by nginx on proxy_pass requests) to only allow requests going
through the proxy.
This adds the custom header to the API client requests, so that they
can pass that header check without going through nginx.
