Reduced OpenShift scopes and enhanced documentation

Documentation/connectors/openshift.md

@@ -6,9 +6,37 @@ Dex can make use of users and groups defined within OpenShift by querying the pl
 
 ## Configuration
 
-Create a new OAuth Client by following the steps described in the documentation for [Registering Additional OAuth Clients](https://docs.openshift.com/container-platform/latest/authentication/configuring-internal-oauth.html#oauth-register-additional-client_configuring-internal-oauth)
 
-This involves creating a resource similar the following
+### Creating an OAuth Client
+
+Two forms of OAuth Clients can be utilized:
+
+* [Using a Service Account as an OAuth Client](https://docs.openshift.com/container-platform/latest/authentication/using-service-accounts-as-oauth-client.html) (Recommended)
+* [Registering An Additional OAuth Client](https://docs.openshift.com/container-platform/latest/authentication/configuring-internal-oauth.html#oauth-register-additional-client_configuring-internal-oauth)
+
+#### Using a Service Account as an OAuth Client
+
+OpenShift Service Accounts can be used as a constrained form of OAuth client. Making use of a Service Account to represent an OAuth Client is the recommended option as it does not require elevated privileged within the OpenShift cluster. Create a new Service Account or make use of an existing Service Account.
+
+Patch the Service Account to add an annotation for location of the Redirect URI
+
+```
+oc patch serviceaccount <name> --type='json' -p='[{"op": "add", "path": "/metadata/annotations/serviceaccounts.openshift.io~1oauth-redirecturi.dex", "value":"https:///<dex_url>/callback"}]'
+```
+
+The Client ID for a Service Account representing an OAuth Client takes the form `
+
+The Client Secret for a Service Account representing an OAuth Client is the long lived OAuth Token that is configued for the Service Account. Execute the following command to retrieve the OAuth Token.
+
+```
+oc serviceaccounts get-token <name>
+```
+
+#### Registering An Additional OAuth Client
+
+Instead of using a constrained form of Service Account to represent an OAuth Client, an additional OAuthClient resource can be created.
+
+Create a new OAuthClient resource similar to the following:
 
 ```yaml
 kind: OAuthClient
@@ -23,6 +51,8 @@ redirectURIs:
 grantMethod: prompt
 ```
 
+### Dex Configuration
+
 The following is an example of a configuration for `examples/config-dev.yaml`:
 
 ```yaml
@@ -46,5 +76,4 @@ connectors:
       # Optional list of required groups a user mmust be a member of
       groups:
         - users
-
 ```