feat: add oidc option for sso (#77)

## Description

...

## Related Issue

Fixes #
<!-- or -->
Relates to #

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Other (security config, docs update, etc)

## Checklist before merging

- [ ] Test, docs, adr added or updated as needed
- [ ] [Contributor Guide
Steps](https://github.com/defenseunicorns/uds-package-mattermost/blob/main/CONTRIBUTING.md#developer-workflow)
followed

---------

Co-authored-by: Wayne Starr <[email protected]>

chart/templates/uds-package.yaml

@@ -12,18 +12,34 @@ spec:
         - "https://{{ .Values.subdomain }}.{{ .Values.domain }}/*"
       defaultClientScopes:
         - "openid"
+        {{ if eq .Values.sso.protocol "gitlab" }}
         - "mapper-oidc-username-username"
         - "mapper-oidc-mattermostid-id"
-        - "mapper-oidc-email-email" 
+        - "mapper-oidc-email-email"
+        {{ end }}
+        {{ if eq .Values.sso.protocol "openid_connect" }}
+        - "profile"
+        - "email"
+        {{ end }}
 
       secretName: {{ .Values.sso.secretName }}
       secretTemplate:
+        {{ if eq .Values.sso.protocol "gitlab" }}
         MM_GITLABSETTINGS_ENABLE: "{{ .Values.sso.enabled | toString }}"
         MM_GITLABSETTINGS_ID: "clientField(clientId)"
         MM_GITLABSETTINGS_SECRET: "clientField(secret)"
         MM_GITLABSETTINGS_AUTHENDPOINT: "https://sso.{{ .Values.domain }}/realms/uds/protocol/openid-connect/auth"
         MM_GITLABSETTINGS_TOKENENDPOINT: "http://keycloak-http.keycloak.svc.cluster.local:8080/realms/uds/protocol/openid-connect/token"
         MM_GITLABSETTINGS_USERAPIENDPOINT: "https://sso.{{ .Values.domain }}/realms/uds/protocol/openid-connect/userinfo"
+        {{ end }}
+        {{ if eq .Values.sso.protocol "openid_connect" }}
+        MM_OPENIDSETTINGS_ENABLE: "{{ .Values.sso.enabled | toString }}"
+        MM_OPENIDSETTINGS_BUTTONTEXT: "{{ .Values.sso.login_button_text }}"
+        MM_OPENIDSETTINGS_BUTTONCOLOR: "{{ .Values.sso.login_button_color }}"
+        MM_OPENIDSETTINGS_DISCOVERYENDPOINT: "https://sso.{{ .Values.domain }}/realms/uds/.well-known/openid-configuration"
+        MM_OPENIDSETTINGS_ID: "clientField(clientId)"
+        MM_OPENIDSETTINGS_SECRET: "clientField(secret)"
+        {{ end }}
         MM_EMAILSETTINGS_ENABLESIGNUPWITHEMAIL: "{{ .Values.sso.enable_sign_up_with_email | toString }}"
         MM_EMAILSETTINGS_ENABLESIGNINWITHEMAIL: "{{ .Values.sso.enable_sign_in_with_email | toString }}"
         MM_EMAILSETTINGS_ENABLESIGNINWITHUSERNAME: "{{ .Values.sso.enable_sign_in_with_username | toString }}"

chart/values.yaml

@@ -29,13 +29,19 @@ postgres:
 
 sso:
   enabled: true
+  # Options: "gitlab", "openid_connect"
+  protocol: "gitlab"
   secretName: mattermost-sso
 
   # These should typically be disabled if SSO is enabled
   enable_sign_up_with_email: false
   enable_sign_in_with_email: false
   enable_sign_in_with_username: false
 
+  # Config for OIDC/SAML
+  login_button_text: "Login with SSO"
+  login_button_color: "#144A8F"
+
 # The subdomain for the mattermost server, will be prefixed to your domain (ex: mattermost.example.com)
 subdomain: "chat"