If the configuration yaml is poorly indented or special values are not appropriately escaped Authelia attempts to load said configuration and fails.
This attempts to unmarshal the config into an empty interface to catch and warn on malformed yaml.
Using the example from issue https://github.com/authelia/authelia/issues/1053#issuecomment-634791662
```yaml
host: 0.0.0.0
port: 9091
log_level: debug
jwt_secret: RUtG9TnbXrOl1XLLmDgySw1DGgx9QcrtepIf1uDDBlBVKFZxkVBruYKBi32PvaU
default_redirection_url: example.com
totp:
issuer: example.com
period: 30
skew: 1
authentication_backend:
file:
path: /etc/authelia/users_database.yml
access_control:
default_policy: deny
rules:
- domain: example.com
policy: bypass
- domain: "*.example.com"
policy: one_factor
session:
name: authelia_session
secret: TVPMIcDFbBwhnW3kLJzKhdjeHhtqisr7m28FgRY8oLh2A4lwuV2jV2ZGdGbh4aa
expiration: 3600
inactivity: 300
domain: example.com
regulation:
max_retries: 3
find_time: 120
ban_time: 300
storage:
mysql:
host: example.com
port: 3306
database: authelia
username: authelia
password: example.com
notifier:
smtp:
username: example.com
password: example.com
host: smtp.gmail.com
port: 465
sender: example.com
```
We would actually get a more meaningful error which helps pinpoint the issue:
`Error malformed yaml: line 23: did not find expected alphabetic or numeric character`
* [FEATURE] Config Validation
* check configuration for invalid keys on startup
* allow users to manually trigger all configuration validation on a file using a cmd
* setup all defaults in config template and run tests against it to prevent accidents
* use tests to check bad configuration values are caught
* use tests to check old configuration values are caught
* add tests for specific key errors
* resolve merge conflicts
* nolint prealloc for test
* [FEATURE] File Secret Loading
* add a validator for secrets
* run the secrets validator before the main config validator
* only allow a secret to be defined in one of: config, env, file env
* remove LF if found in file
* update configuration before main config validation
* fix unit tests
* implement secret testing
* refactor the secrets validator
* make check os agnostic
* update docs
* add warning when user attempts to use ENV instead of ENV file
* discourage ENV in docs
* update config template
* oxford comma
* apply suggestions from code review
* rename Validate to ValidateConfiguration
* add k8s example
* add deprecation notice in docs and warning
* style changes
* added support for listing multiple domains and multiple subjects
* updated documentation to show use of multiple domains and subjects
* updated config.template.yml to display multiple domains as a list
* updated config.template.yml to display multiple subjects as a list
* updated docs/configuration/access-control.md to display multiple domains as a list
* updated docs/configuration/access-control.md to display multiple subjects as a list
* removed redundant check that always returned true
* Commentary definition for `weak`
* [FEATURE] Support writing logs in a file.
* Add documentation about logs file path.
* Rename logs_level and logs_file_path into log_level and log_file_path.
* Update BREAKING.md
Fixes#338
Co-authored-by: Amir Zarrinkafsh <nightah@me.com>
