Cannot create multiple namespaces using "file:///" source

[cvolante54]

Describe the bug

When using a file as the source to configure the namespaces, the interface is limited to only one file, and the file itself is limited to only allow for one namespace to be created (source code: https://github.com/ory/keto/blob/master/internal/driver/config/namespace_watcher.go#L152)

Reproducing the bug

Steps to reproduce the behavior:

1. Run keto version v0.6
2. Configure the namespaces parameter in the configuration file to be "namespaces: file:///etc/extra/config/keto_namespaces.json"
3. Inside the keto_namespaces.json only one namespace definition is allowed (ex. { "id": 0, "name": "sample" })

Server logs
When an array of namespaces is passed into the file:

level=error msg=could not parse namespace file audience=application error=map[message:json: cannot unmarshal array into Go value of type namespace.Namespace] file_name=/etc/extra/config/keto_namespaces.json service_name=ORY Keto service_version=master

Server configuration
The only relevant section:

namespaces: file:///etc/extra/config/keto_namespaces.json

Expected behavior

I expect that multiple namespaces can be passed through a file namespaces source just like multiple namespaces can be defined in the configuration file itself.

Environment

• Version: v0.6
• Environment: Docker/Kubernetes

[zepatrik]

To specify multiple files, use an array of paths:

namespaces:
  - file:///path1
  - file:///path2
  - file:///path3

or alternatively, point the path to the directory that contains all namespace files:

namespaces: file:///keto-namespaces

[zepatrik]

The relevant code for that is here:

keto/internal/driver/config/namespace_watcher.go

Lines 60 to 69 in f53d3eb

	info, err := os.Stat(u.Path)
	if err != nil {
	return nil, errors.WithStack(err)
	}
	if info.IsDir() {
	nw.w, err = watcherx.WatchDirectory(ctx, u.Path, nw.ec)
	} else {
	nw.w, err = watcherx.Watch(ctx, u, nw.ec)
	}

[zepatrik]

@cvolante54 can you confirm this is working now?

[cvolante54]

@zepatrik Yes, using a directory path and multiple files worked!

[zepatrik]

Awesome 👍