piyushdubey commented on code in PR #14065:
URL: https://github.com/apache/iceberg/pull/14065#discussion_r2373287868


##########
docs/docs/configuration.md:
##########
@@ -143,6 +143,30 @@ The properties can be manually constructed or passed in 
from a compute engine li
 Spark uses its session properties as catalog properties, see more details in 
the [Spark configuration](spark-configuration.md#catalog-configuration) section.
 Flink passes in catalog properties through `CREATE CATALOG` statement, see 
more details in the [Flink](flink.md#adding-catalogs) section.
 
+### Catalog REST auth properties
+
+The following catalog properties configure authentication for the REST catalog.
+They support Basic, OAuth2, SigV4, and Google authentication, in addition to 
the default none.
+
+### REST auth properties (from `AuthProperties`)
+
+| Property                             | Default          | Description        
                                                                                
                                               |
+|--------------------------------------|------------------|---------------------------------------------------------------------------------------------------------------------------------------------------|
+| `rest.auth.type`                     | none             | Authentication 
mechanism for REST catalog access. Supported values: `none`, `basic`, `oauth2`, 
`sigv4`, `google`.                                 |
+| `rest.auth.basic.username`           | null             | Username for Basic 
authentication. Required if `rest.auth.type` = `basic`.                         
                                               |
+| `rest.auth.basic.password`           | null             | Password for Basic 
authentication. Required if `rest.auth.type` is `basic`.                        
                                               |
+| `rest.auth.credential`               | null             | Credential string 
(client_id:client_secret) exchanged for a token in the OAuth2 
client-credentials flow. Required if `rest.auth.type` = `oauth2`. |
+| `rest.auth.sigv4.delegate-auth-type` | `oauth2`         | Auth type to 
delegate to after SigV4 signing. Defaults to `oauth2`.                          
                                                     |
+| `oauth2-server-uri`                  | null             | OAuth2 token 
endpoint URI. Required if the REST catalog is not the OAuth2 authentication 
server. Required if `rest.auth.type` = `oauth2`.         |

Review Comment:
   Done.



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