Identity Gateway 2024.3

ScriptableThrottlingPolicy

Uses a script to look up the throttling rates to apply to groups of requests.

The script can store the mapping for the throttling rate in memory, and can use a more complex mapping mechanism than that used in the MappedThrottlingPolicy. For example, the script can map the throttling rate for a range of IP addresses. The script can also query an external database or read the mapping from a file.

For information about script properties, available global objects, and automatically imported classes, refer to Scripts.

Usage

{
  "type": "ThrottlingFilter",
  "config": {
    "requestGroupingPolicy": runtime expression<string>,
    "throttlingRatePolicy": {
      "name": string,
      "type": "ScriptableThrottlingPolicy",
      "config": {
        "type": configuration expression<string>,
        "file": configuration expression<string>, // Use either "file"
        "source": [ string, ... ],                // or "source", but not both
        "args": map,
        "clientHandler": Handler reference
        }
    }
  }
}

Properties

For information about properties for ScriptableThrottlingPolicy, refer to Scripts.

Example of a scriptable throttling policy

In the following example, the DefaultRateThrottlingPolicy delegates the management of throttling to the scriptable throttling policy. For information about how to set up and test this example, refer to Configure scriptable throttling.

{
  "name": "00-throttle-scriptable",
  "baseURI": "http://app.example.com:8081",
  "condition": "${find(request.uri.path, '^/home/throttle-scriptable')}",
  "heap": [
    {
      "name": "SystemAndEnvSecretStore-1",
      "type": "SystemAndEnvSecretStore"
    },
    {
      "name": "AmService-1",
      "type": "AmService",
      "config": {
        "agent": {
          "username": "ig_agent",
          "passwordSecretId": "agent.secret.id"
        },
        "secretsProvider": "SystemAndEnvSecretStore-1",
        "url": "http://am.example.com:8088/openam/"
      }
    }
  ],
  "handler": {
    "type": "Chain",
    "config": {
      "filters": [
        {
          "name": "OAuth2ResourceServerFilter-1",
          "type": "OAuth2ResourceServerFilter",
          "config": {
            "scopes": [
              "mail",
              "employeenumber"
            ],
            "requireHttps": false,
            "realm": "OpenIG",
            "accessTokenResolver": {
              "name": "token-resolver-1",
              "type": "TokenIntrospectionAccessTokenResolver",
              "config": {
                "amService": "AmService-1",
                "providerHandler": {
                  "type": "Chain",
                  "config": {
                    "filters": [
                      {
                        "type": "HttpBasicAuthenticationClientFilter",
                        "config": {
                          "username": "ig_agent",
                          "passwordSecretId": "agent.secret.id",
                          "secretsProvider": "SystemAndEnvSecretStore-1"
                        }
                      }
                    ],
                    "handler": "ForgeRockClientHandler"
                  }
                }
              }
            }
          }
        },
        {
          "name": "ThrottlingFilter-1",
          "type": "ThrottlingFilter",
          "config": {
            "requestGroupingPolicy": "${contexts.oauth2.accessToken.info.mail}",
            "throttlingRatePolicy": {
              "type": "DefaultRateThrottlingPolicy",
              "config": {
                "delegateThrottlingRatePolicy": {
                  "name": "ScriptedPolicy",
                  "type": "ScriptableThrottlingPolicy",
                  "config": {
                    "type": "application/x-groovy",
                    "source": [
                      "if (contexts.oauth2.accessToken.info.status == status) {",
                      "  return new ThrottlingRate(rate, duration)",
                      "} else {",
                      "  return null",
                      "}"
                    ],
                    "args": {
                      "status": "gold",
                      "rate": 6,
                      "duration": "10 seconds"
                    }
                  }
                },
                "defaultRate": {
                  "numberOfRequests": 1,
                  "duration": "10 s"
                }
              }
            }
          }
        }
      ],
      "handler": "ReverseProxyHandler"
    }
  }
}
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