GatewayHttpApplication (`config.json` )

The GatewayHttpApplication is the entry point for all incoming gateway requests. It is responsible for initializing a heap of objects, described in Heap Objects, and providing the main Handler that receives all the incoming requests.

The configuration is loaded from a JSON-encoded file, expected by default at $HOME/.openig/config/config.json. Objects configured in config.json can be used by config.json and any IG route. They cannot be used by admin.json.

If you provide a config.json, the IG configuration is loaded from that file. If there is no file, the default configuration is loaded. For the default configuration, and the example config.json used in many of the examples in the documentation, see the Examples section of this page.

Routes endpoint

The endpoint is defined by the presence and content of config.json, as follows:

When config.json is not provided, the routes endpoint includes the name of the main router in the default configuration, _router.
When config.json is provided with an unnamed main router, the routes endpoint includes the main router name router-handler.
When config.json is provided with a named main router, the routes endpoint includes the provided name or the transformed, URL-friendly name.

Studio deploys and undeploys routes through a main router named _router, which is the name of the main router in the default configuration. If you use a custom config.json, make sure it contains a main router named _router.

Default objects

IG creates objects by default in config.json. To override a default object, configure an object with the same name in config.json.

Configure default objects in config.json and admin.json seperately. An object configured in config.json with the same name as an object configured in admin.json is not the same object.

BaseUriDecorator: A decorator to override the scheme, host, and port of the existing request URI. The default BaseUriDecorator is named baseURI. For more information, see BaseUriDecorator.

AuditService

Records no audit events. The default AuditService is NoOpAuditService. For more information, refer to NoOpAuditService.

CaptureDecorator

Captures requests and response messages. The default CaptureDecorator is named capture, and uses the default settings given in CaptureDecorator.

When a capture point for the default CaptureDecorator is defined in a route, for example, when "capture: "all" is set as a top-level attribute of the JSON, log messages for requests and responses passing through the route are written to a log file in $HOME/.openig/logs.

When no capture point is defined in a route, only exceptions thrown during request or response processing are logged.

By default, request and response contexts and entities are not captured. Do one of the following to capture information:

Override the default capture decorator declaration, and set captureEntity to true.
Declare another CaptureDecorator object with an appropriate configuration and use it at your capture points.

The capture decorator logs information about the HTTP request and response messages, along with their respective headers.

ClientHandler

Communicates with third-party services. For more information, refer to ClientHandler.

ForgeRockClientHandler

Sends ForgeRock Common Audit transaction IDs when communicating with protected applications. The default ForgeRockClientHandler is a Chain, composed of a TransactionIdOutboundFilter and a ClientHandler.

ProxyOptions

A proxy to which a ClientHandler or ReverseProxyHandler can submit requests, and an AmService can submit Websocket notifications. For more information, refer to ProxyOptions.

ReverseProxyHandler

Communicates with third-party services. For more information, refer to ReverseProxyHandler.

ScheduledExecutorService

Specifies the number of threads in a pool.

SecretsService (deprecated)

Manages a store of secrets from files, system properties, and environment variables, by using ForgeRock Commons Secrets API. The default SecretsService is a SystemAndEnvSecretStore with the default configuration. For more information, refer to Secrets.

TemporaryStorage

Manages temporary buffers. For more information, refer to TemporaryStorage.

TimerDecorator

Records time spent within filters and handlers. The default TimerDecorator is named timer. For more information, refer to TimerDecorator.

TransactionIdOutboundFilter

Inserts the ID of a transaction into the header of a request.

Sessions

When the heap is configured with a JwtSession object named Session, the object is used as the default session producer. Stateless sessions are created for all requests.

When a JwtSession is not configured for a request, session information is stored in the IG cookie, called by default IG_SESSIONID.

For more information, see Sessions and JwtSession.

Usage

{
  "handler": Handler reference,
  "heap": [ object, ... ],
  "properties": object,
  "secrets"^(*): {
    "stores": [ SecretStore reference, ... ]
  },
  "temporaryStorage": TemporaryStorage reference
}

^(*)Deprecated

Properties

"handler": Handler reference, required: The Handler to which IG dispaches requests.

Provide either the name of a Handler object defined in the heap, or an inline Handler configuration object.

"heap": array of objects, optional

The heap object configuration, described in Heap Objects.

You can omit an empty array. If you only have one object in the heap, you can inline it as the handler value.

"properties": object, optional

Configuration parameters declared as property variables for use in the configuration. See also Route properties.

Default: Null

"secrets": SecretStore reference, optional

This property is deprecated; use SecretsProvider instead. For more information, refer to the Deprecated section of the Release Notes.

One or more secret stores, as defined in Secrets object and secret stores.

"temporaryStorage": TemporaryStorage reference, optional

The TemporaryStorage object to buffer content during processing.

Provide the name of a TemporaryStorage object defined in the heap, or an inline TemporaryStorage configuration object.

Incoming requests use the temporary storage buffer as follows:

Used only when streamingEnabled is false.
The request is loaded into the IG storage defined in temporaryStorage, before it enters the chain.
If the content length of the request is more than the buffer limit, IG returns an HTTP 413 Payload Too Large.

Default: Use the heap object named TemporaryStorage. Otherwise use an internally-created TemporaryStorage object that is named TemporaryStorage, and that uses default settings for a TemporaryStorage object.

Example configuration files

Default configuration

When your configuration does not include a config.json file, the following configuration is provided by default.

{
    "heap": [
        {
            "name": "_router",
            "type": "Router",
            "config": {
                "scanInterval": "&{ig.router.scan.interval|10 seconds}",
                "defaultHandler": {
                    "type": "DispatchHandler",
                    "config": {
                        "bindings": [
                            {
                                "condition": "${request.method == 'GET' and request.uri.path == '/'}",
                                "handler": {
                                    "type": "WelcomeHandler"
                                }
                            },
                            {
                                "condition": "${request.uri.path == '/'}",
                                "handler": {
                                    "type": "StaticResponseHandler",
                                    "config": {
                                        "status": 405,
                                        "reason": "Method Not Allowed"
                                    }
                                }
                            },
                            {
                                "handler": {
                                    "type": "StaticResponseHandler",
                                    "config": {
                                        "status": 404,
                                        "reason": "Not Found"
                                    }
                                }
                            }
                        ]
                    }
                }
            }
        }
    ],
    "handler": "_router"
}

Notice the following features of the default configuration:

The handler contains a main router named _router. When IG receives an incoming request, _router routes the request to the first route in the configuration whose condition is satisfied.
If the request doesn’t satisfy the condition of any route, it is routed to the defaultHandler. If the request is to access the IG welcome page, IG dispatches the request. Otherwise, IG returns an HTTP status 404 (Resource not found), because the requested resource does not exist.

Example config.json used in the doc

The following example of config.json is used in many of the examples in the documentation:

{
  "handler": {
    "type": "Router",
    "name": "_router",
    "baseURI": "http://app.example.com:8081",
    "capture": "all"
  },
  "heap": [
    {
      "name": "JwtSession",
      "type": "JwtSession"
    },
    {
      "name": "capture",
      "type": "CaptureDecorator",
      "config": {
        "captureEntity": true,
        "_captureContext": true
      }
    }
  ]
}

Notice the following features of the file:

The handler contains a main router named _router. When IG receives an incoming request, _router routes the request to the first route in the configuration whose condition is satisfied.
The baseURI changes the request URI to point the request to the sample application.
The capture captures the body of the HTTP request and response.
The JwtSession object in the heap can be used in routes to store the session information as JSON Web Tokens (JWT) in a cookie. For more information, refer to JwtSession.

More information

org.forgerock.openig.http.GatewayHttpApplication

IG 2023.2

GatewayHttpApplication (config.json )