help request: authz-keycloak with authorization_code

[SKDragon18]

Description

Hi i use authz-keycloak for getting token from keycloak use grant_type default "urn:ietf:params:oauth:grant-type:uma-ticket", it support password. I want to know what else option grant_type or api create route for getting token by authorization_code

Environment

• APISIX version (run apisix version):
• Operating system (run uname -a):
• OpenResty / Nginx version (run openresty -V or nginx -V):
• etcd version, if relevant (run curl http://127.0.0.1:9090/v1/server_info):
• APISIX Dashboard version, if relevant:
• Plugin runner version, for issues related to plugin runners:
• LuaRocks version, for installation issues (run luarocks --version):

[SKDragon18]

This is my curl to create route in apisix:

curl -X PUT "http://127.0.0.1:9180/apisix/admin/routes/keycloak-authen" \
     -H "X-API-KEY: xxx" \ 
     -H "Content-Type: application/json" \
     -d '{
       "uri": "/auth/token",
       "plugins": {
         "authz-keycloak": {
           "token_endpoint": "http://host.docker.internal:8080/realms/apisix_test_realm/protocol/openid-connect/token",
           "client_id": "xxx", 
           "client_secret": "xxx", 
           "password_grant_token_generation_incoming_uri": "/auth/token"
         }
       },
       "upstream": {
         "type": "roundrobin",
         "nodes": {
           "host.docker.internal:8080": 1
         }
       }
     }'

[SKDragon18]

i found solution, i use route with proxy-rewrite instead of authz-keycloak. The goal is for Access_Token to keep Issuer - the domain of Keycloak instead of returning Apisix's domain when encrypted.
Curl like that:

curl -X PUT "http://127.0.0.1:9180/apisix/admin/routes/keycloak-authen" \
     -H "X-API-KEY: xxx" \
     -H "Content-Type: application/json" \
     -d '{
        "id": "keycloak-authen",
        "uri": "/auth/token",
        "methods": ["POST"],
        "plugins": {
          "proxy-rewrite": {
            "regex_uri": ["/auth/token", "/realms/apisix_test_realm/protocol/openid-connect/token"]
          }
        },
        "upstream": {
          "type": "roundrobin",
          "nodes": {
            "host.docker.internal:8080": 1
          },
          "scheme": "http",
          "pass_host": "rewrite",
          "upstream_host": "host.docker.internal:8080"
        }
      }'