Encode auth parameters into authParams property

- Replace `authParamsMap` with `authentication`

Fixes #95

spring-pulsar-docs/src/main/asciidoc/authentication.adoc

@@ -0,0 +1,91 @@
+[appendix]
+[[appendix.authentication]]
+= Authentication
+
+[[Athenz]]
+== Athenz
+====
+[source, yaml]
+----
+spring.pulsar.client.auth-plugin-class-name: org.apache.pulsar.client.impl.auth.AuthenticationAthenz
+spring.pulsar.client.authentication.tenant-domain: ...
+spring.pulsar.client.authentication.tenant-service: ...
+spring.pulsar.client.authentication.provider-domain: ...
+spring.pulsar.client.authentication.private-key: ...
+spring.pulsar.client.authentication.private-key-path: ...
+spring.pulsar.client.authentication.key-id: ...
+spring.pulsar.client.authentication.auto-prefetch-enabled: ...
+spring.pulsar.client.authentication.athenz-conf-path: ...
+spring.pulsar.client.authentication.principal-header: ...
+spring.pulsar.client.authentication.role-header: ...
+spring.pulsar.client.authentication.zts-url: ...
+----
+====
+
+[[Basic]]
+== Basic
+====
+[source, yaml]
+----
+spring.pulsar.client.auth-plugin-class-name: org.apache.pulsar.client.impl.auth.AuthenticationBasic
+spring.pulsar.client.authentication.user-id: ...
+spring.pulsar.client.authentication.password: ...
+----
+====
+
+[[KeyStoreTls]]
+== KeyStoreTls
+====
+[source, yaml]
+----
+spring.pulsar.client.auth-plugin-class-name: org.apache.pulsar.client.impl.auth.AuthenticationKeyStoreTls
+spring.pulsar.client.authentication.key-store-type: ...
+spring.pulsar.client.authentication.key-store-path: ...
+spring.pulsar.client.authentication.key-store-password: ...
+----
+====
+
+[[OAuth2]]
+== OAuth2
+====
+[source, yaml]
+----
+spring.pulsar.client.auth-plugin-class-name: ...
+spring.pulsar.client.authentication.issuer-url: ...
+spring.pulsar.client.authentication.private-key: ...
+spring.pulsar.client.authentication.audience: ...
+spring.pulsar.client.authentication.scope: ...
+----
+====
+
+[[Sasl]]
+== Sasl
+====
+[source, yaml]
+----
+spring.pulsar.client.auth-plugin-class-name: org.apache.pulsar.client.impl.auth.AuthenticationSasl
+spring.pulsar.client.authentication.sasl-jaas-client-section-name: ...
+spring.pulsar.client.authentication.server-type: ...
+----
+====
+
+[[Tls]]
+== Tls
+====
+[source, yaml]
+----
+spring.pulsar.client.auth-plugin-class-name: org.apache.pulsar.client.impl.auth.AuthenticationTls
+spring.pulsar.client.authentication.tls-cert-file: ...
+spring.pulsar.client.authentication.tls-key-file: ...
+----
+====
+
+[[Token]]
+== Token
+====
+[source, yaml]
+----
+spring.pulsar.client.auth-plugin-class-name: org.apache.pulsar.client.impl.auth.AuthenticationToken
+spring.pulsar.client.authentication.token: ...
+----
+====

spring-pulsar-docs/src/main/asciidoc/pulsar.adoc

@@ -19,6 +19,40 @@ This is done through a factory bean called `PulsarClientFactoryBean`, which take
 include::application-properties/pulsar-client.adoc[lines=3..-1]
 ====
 
+To connect against a Pulsar cluster requiring authentication, you need to set the `authPluginClassName` and parameters for your authentication scheme.
+To set the authentication parameters you can either pass them as a json-encoded string or as a nested map. Please see the examples below for each option:
+
+====
+[source, yaml]
+----
+# using json-encoded string
+spring:
+  pulsar:
+    client:
+      auth-plugin-class-name: org.apache.pulsar.client.impl.auth.oauth2.AuthenticationOAuth2
+      auth-params: "{\"privateKey\":\"file:///Users/some-key.json\",\"issuerUrl\":\"https://auth.server.cloud/", \"audience\":\"urn:sn:acme:dev:my-instance"}"
+----
+====
+
+====
+[source, yaml]
+----
+# using nested parameter map
+spring:
+  pulsar:
+    client:
+      auth-plugin-class-name: org.apache.pulsar.client.impl.auth.oauth2.AuthenticationOAuth2
+      authentication.issuer-url: https://auth.server.cloud/
+      authentication.private-key: file:///Users/some-key.json
+      authentication.audience: urn:sn:acme:dev:my-instance
+----
+====
+
+.[.underline]#Click ##here## to view how to configure the different **authentication schemes**#.
+[%collapsible]
+====
+include::authentication.adoc[lines=3..-1]
+====
 
 [[pulsar-producer]]
 ==== Pulsar Producer