Reference: pubsub pulsar OIDC authentication

daprdocs/content/en/reference/components-reference/supported-pubsub/setup-pulsar.md

@@ -73,7 +73,6 @@ The above example uses secrets as plain strings. It is recommended to use a [sec
 |--------------------|:--------:|---------|---------|
 | host               | Y  | Address of the Pulsar broker. Default is `"localhost:6650"` | `"localhost:6650"` OR `"http://pulsar-pj54qwwdpz4b-pulsar.ap-sg.public.pulsar.com:8080"`|
 | enableTLS          | N  | Enable TLS.  Default: `"false"` | `"true"`, `"false"` |
-| token              | N  | Enable Authentication.  | [How to create pulsar token](https://pulsar.apache.org/docs/en/security-jwt/#generate-tokens)|
 | tenant             | N  | The topic tenant within the instance. Tenants are essential to multi-tenancy in Pulsar, and spread across clusters.  Default: `"public"` | `"public"` |
 | consumerID         | N  | Used to set the subscription name or consumer ID.  | `"channel1"`
 | namespace          | N  | The administrative unit of the topic, which acts as a grouping mechanism for related topics.  Default: `"default"` | `"default"`
@@ -91,6 +90,77 @@ The above example uses secrets as plain strings. It is recommended to use a [sec
 | subscribeType | N | Pulsar supports four kinds of [subscription types](https://pulsar.apache.org/docs/3.0.x/concepts-messaging/#subscription-types). Default: `"shared"` | `"shared"`, `"exclusive"`, `"failover"`, `"key_shared"`|
 | partitionKey | N | Sets the key of the message for routing policy. Default: `""` | |
 
+### Authenticate using Token
+
+To authenticate to pulsar using a static [JWT token](https://pulsar.apache.org/docs/en/security-jwt), you can use the following metadata field:
+
+| Field  | Required | Details | Example |
+|--------|:--------:|---------|---------|
+| token | N | Token used for authentication. | [How to create Pulsar token](https://pulsar.apache.org/docs/en/security-jwt/#generate-tokens)|
+
+```yaml
+apiVersion: dapr.io/v1alpha1
+kind: Component
+metadata:
+  name: messagebus
+spec:
+  type: pubsub.pulsar
+  version: v1
+  metadata:
+  - name: host
+    value: "pulsar.example.com:6650"
+  - name: token
+    secretKeyRef:
+      name: pulsar
+      key:  token
+```
+
+### Authenticate using OIDC
+
+Since `v3.0`, [Pulsar supports OIDC authentication](https://pulsar.apache.org/docs/3.0.x/security-openid-connect/).
+To enable OIDC authentication, you need to provide the following OAuth2 parameters to the component spec.
+OAuth2 authentication cannot be used in combination with token authentication.
+It is recommended that you use a secret reference for the client secret.
+The pulsar OAuth2 authenticator is not specifically complaint with OIDC so it is your responsibility to ensure fields are compliant. For example, the issuer URL must use the `https` protocol, the requested scopes include `openid`, etc.
+If the `oauth2TokenCAPEM` field is omitted then the system's certificate pool is used for connecting to the OAuth2 issuer if using `https`.
+
+| Field  | Required | Details | Example |
+|--------|:--------:|---------|---------|
+| oauth2TokenURL | N | URL to request the OIDC client_credentials token from. Must not be empty. | "https://oauth.example.com/o/oauth2/token"` |
+| oauth2TokenCAPEM | N | CA PEM certificate bundle to connect to the OAuth2 issuer. If not defined, the system's certificate pool will be used. | `"---BEGIN CERTIFICATE---\n...\n---END CERTIFICATE---"` |
+| oauth2ClientID | N | OIDC client ID. Must not be empty. | `"my-client-id"` |
+| oauth2ClientSecret | N | OIDC client secret. Must not be empty. | `"my-client-secret"` |
+| oauth2Audiences | N | Comma separated list of audiences to request for. Must not be empty. | `"my-audience-1,my-audience-2"` |
+| oauth2Scopes | N | Comma separated list of scopes to request. Must not be empty. | `"openid,profile,email"` |
+
+
+```yaml
+apiVersion: dapr.io/v1alpha1
+kind: Component
+metadata:
+  name: messagebus
+spec:
+  type: pubsub.pulsar
+  version: v1
+  metadata:
+  - name: host
+    value: "pulsar.example.com:6650"
+  - name: oauth2TokenURL
+    value: https://oauth.example.com/o/oauth2/token
+  - name: oauth2TokenCAPEM
+    value: "---BEGIN CERTIFICATE---\n...\n---END CERTIFICATE---"
+  - name: oauth2ClientID
+    value: my-client-id
+  - name: oauth2ClientSecret
+    secretKeyRef:
+      name: pulsar-oauth2
+      key:  my-client-secret
+  - name: oauth2Audiences
+    value: "my.pulsar.example.com,another.pulsar.example.com"
+  - name: oauth2Scopes
+    value: "openid,profile,email"
+```
+
 ### Enabling message delivery retries
 
 The Pulsar pub/sub component has no built-in support for retry strategies. This means that sidecar sends a message to the service only once and is not retried in case of failures. To make Dapr use more spohisticated retry policies, you can apply a [retry resiliency policy]({{< ref "policies.md#retries" >}}) to the Pulsar pub/sub component. Note that it will be the same Dapr sidecar retrying the redelivery the message to the same app instance and not other instances.