feat(datahub-frontend): add other to supported OIDC providers (#530)

Selecting provider type of `other` will allow using a private
identity provider for OIDC e.g. Keycloak. Fixes !529

Signed-off-by: Daniel Hill <[email protected]>

Author: dan-hill2802

Diff for: charts/datahub/subcharts/datahub-frontend/README.md

@@ -47,6 +47,7 @@ Current chart version is `0.2.0`
 | oidcAuthentication.clientSecret                                             | string                                                                                            | `""`                                 | A shared secret to use for exchange between you and your identity provider                                                                                                                                                                                                                                                       |
 | oidcAuthentication.clientSecretRef.secretRef                                | string                                                                                            | `"nil"`                              | Optional, this is the reference to the shared secret to use for exchange between you and your identity provider                                                                                                                                                                                                                  |
 | oidcAuthentication.clientSecretRef.secretKey                                | string                                                                                            | `"nil"`                              | Optional, this is the key of the shared secret to use for exchange between you and your identity provider                                                                                                                                                                                                                        |
+| oidcAuthentication.discoveryUri                                             | string                                                                                            | `""`                                 | Discovery URI, e.g. `https://my-keycloak.example.com/realms/master/.well-known/openid-configuration`; needed only if `provider` is set to `other`                                                                                                                                                                                |
 | oidcAuthentication.oktaDomain                                               | string                                                                                            | `""`                                 | Okta domain, e.g. `dev-12345.okta.com`; needed only if `provider` is set to `okta`                                                                                                                                                                                                                                               |
 | oidcAuthentication.azureTenantId                                            | string                                                                                            | `""`                                 | Azure directory (tenant) ID; neede only if `provider` is set to `azure`                                                                                                                                                                                                                                                          |
 | oidcAuthentication.user_name_claim                                          | string                                                                                            | `""`                                 | The attribute that will contain the username used on the DataHub platform                                                                                                                                                                                                                                                        |

Diff for: charts/datahub/subcharts/datahub-frontend/templates/deployment.yaml

@@ -244,6 +244,11 @@ spec:
               value: https://login.microsoftonline.com/{{ .azureTenantId }}/v2.0/.well-known/openid-configuration
             - name: AUTH_OIDC_SCOPE
               value: {{ .scope | default "openid profile email" }}
+            {{- else if eq .provider "other" }}
+            - name: AUTH_OIDC_DISCOVERY_URI
+              value: {{ .discoveryUri }}
+            - name: AUTH_OIDC_SCOPE
+              value: {{ .scope | default "openid profile email" }}
             {{- else }}
             {{- fail (printf "unsupported .oidcAuthentication.provider value '%s'" .provider) }}
             {{- end }}

Diff for: charts/datahub/subcharts/datahub-frontend/values.yaml

@@ -85,14 +85,16 @@ auth:
 # OIDC auth based on https://datahubproject.io/docs/authentication/guides/sso/configure-oidc-react
 oidcAuthentication:
   enabled: false
-  # provider: google/okta/azure  <- choose only one
+  # provider: google/okta/azure/other  <- choose only one
 
   # clientId: your-client-id
   # clientSecret: your-client-secret
   # only needed if you would like to store the client secret in secret
   # clientSecretRef:
   #   secretRef: <secret-ref>
   #   secretKey: <secret-key>
+  # only needed if provider is `other`
+  # discoveryUri: https://my-keycloak.example.com/realms/master/.well-known/openid-configuration
   # only needed if provider is `okta`
   # oktaDomain: your-okta-domain.com