The pgrst.jwt_secret in-database configuration should not interpret a file path

[laurenceisla]

Description of issue

The pgrst.jwt_secret in-database configuration can interpret a file path when it should not. For example:

create or replace function postgrest.pre_config()
returns void as $$
  select set_config('pgrst.jwt_secret', '@/path/to/secret', true);
$$ language sql;

Right now, it reads the values inside /path/to/secret, but it should interpret the secret as is. That is, the secret should be the string "@/path/to/secret".

[wolfgangwalther]

I think @/does/not/exist when given via database configuration should be interpreted as a secret, not as a path. So a secret starting with @.

[laurenceisla]

I think @/does/not/exist when given via database configuration should be interpreted as a secret, not as a path. So a secret starting with @.

Agree, also mentioned here #3634 (comment). I'll change the title and description of the issue since the original one is no longer relevant.