IDM 7.4.1

Create custom endpoints to launch scripts

Custom endpoints let you run arbitrary scripts through the REST API.

A custom endpoint configuration includes an inline script or script file reference in JavaScript or Groovy. The script provides the endpoint functionality.

Sample Custom Endpoint Configuration 
{
    "type" : "text/javascript",
    "source" : "<script>",
    "apiDescription" : {
        "title" : "Echo",
        "description" : "Service that echo's your HTTP requests.",
        "mvccSupported" : false,
        "create" : {
            "description" : "Echo a CREATE request.",
            "mode" : "ID_FROM_SERVER",
            "singleton" : false
        },
        "read" : { "description" : "Echo a READ request." },
        "update" : { "description" : "Echo an UPDATE request." },
        "delete" : { "description" : "Echo a DELETE request." },
        "patch" : {
            "description" : "Echo a PATCH request.",
            "operations" : [ "ADD", "REMOVE", "REPLACE", "INCREMENT", "COPY", "MOVE", "TRANSFORM" ]
        },
        "actions" : [
            {
                "description" : "Echo an ACTION request.",
                "name" : "echo",
                "request" : { "type" : "object" },
                "response" : {
                    "title" : "Echo action response",
                    "type" : "object",
                    "properties" : {
                        "method" : {
                            "type" : "string",
                            "enum" : [ "action" ]
                        },
                        "action" : { "type" : "string" },
                        "content" : { "type" : "object" },
                        "parameters" : { "type" : "object" },
                        "context" : { "type" : "object" }
                    }
                }
            }
        ],
        "queries" : [
            {
                "description" : "Echo a query-filter request.",
                "type" : "FILTER",
                "queryableFields" : [ "*" ]
            },
            {
                "description" : "Echo a query-all request.",
                "type" : "ID",
                "queryId" : "query-all"
            },
            {
                "description" : "Echo a query-all-ids request.",
                "type" : "ID",
                "queryId" : "query-all-ids"
            }
        ],
        "resourceSchema" : {
            "title" : "Echo resource",
            "type" : "object",
            "properties" : {
                "method" : {
                    "title" : "CREST method",
                    "type" : "string"
                },
                "resourceName" : { "type" : "string" },
                "parameters" : { "type" : "object" },
                "context" : { "type" : "object" }
            }
        }
    }
}
Sample Custom Endpoint Script 
(function(){
    if (request.method === "create") {
        return {
            method: "create",
            resourceName: request.resourcePath,
            newResourceId: request.newResourceId,
            parameters: request.additionalParameters,
            content: request.content,
            context: context.current
        };
    } else if (request.method === "read") {
        return {
            method: "read",
            resourceName: request.resourcePath,
            parameters: request.additionalParameters,
            context: context.current
        };
    } else if (request.method === "update") {
        return {
            method: "update",
            resourceName: request.resourcePath,
            revision: request.revision,
            parameters: request.additionalParameters,
            content: request.content,
            context: context.current
        };
    } else if (request.method === "patch") {
        return {
            method: "patch",
            resourceName: request.resourcePath,
            revision: request.revision,
            parameters: request.additionalParameters,
            patch: request.patchOperations,
            context: context.current
        };
    } else if (request.method === "query") {
        // query results must be returned as a list of maps
        return [ {
            method: "query",
            resourceName: request.resourcePath,
            pagedResultsCookie: request.pagedResultsCookie,
            pagedResultsOffset: request.pagedResultsOffset,
            pageSize: request.pageSize,
            queryId: request.queryId,
            queryFilter: request.queryFilter.toString(),
            parameters: request.additionalParameters,
            content: request.content,
            context: context.current
        } ];
    } else if (request.method === "delete") {
        return {
            method: "delete",
            resourceName: request.resourcePath,
            revision: request.revision,
            parameters: request.additionalParameters,
            context: context.current
        };
    } else if (request.method === "action") {
        return {
            method: "action",
            action: request.action,
            content: request.content,
            parameters: request.additionalParameters,
            context: context.current
        };
    } else {
        throw { code : 500, message : "Unknown request type " + request.method };
    }
})();

A sample custom endpoint configuration is provided in the openidm/samples/example-configurations/custom-endpoint directory. The sample includes three files:

conf/endpoint-echo.json

Provides the configuration for the endpoint.

script/echo.js

Provides the endpoint functionality in JavaScript.

script/echo.groovy

Provides the endpoint functionality in Groovy.

This sample endpoint is described in detail in the sample: Create a custom endpoint.

Custom endpoint configuration

A custom endpoint configuration has the following structure:

{
    "context" : "context path",
    "type" : "script language",
    "source" : "script source" | "file" : "script file",
    "apiDescription" : "API descriptor object"
}
context

string, optional

The root URL path for the endpoint, in other words, the route to the endpoint. An endpoint with the context endpoint/test is addressable over REST at the URL http://localhost:8080/openidm/endpoint/test or by using a script such as openidm.read("endpoint/test").

Endpoint contexts support wild cards, as shown in the preceding example. The endpoint/linkedview/* route matches the following patterns:

endpoint/linkedView/managed/user/bjensen
endpoint/linkedView/system/ldap/account/bjensen
endpoint/linkedView/
endpoint/linkedView

The context parameter is not mandatory in the endpoint configuration file. If you do not include a context, the route to the endpoint is identified by the name of the file. For example, in the sample endpoint configuration provided in openidm/samples/example-configurations/custom-endpoint/conf/endpoint-echo.json, the route to the endpoint is endpoint/echo.

type

string, required

The script type.

IDM supports "text/javascript" and "groovy".

file or source

The path to the script file, or the script itself, inline.

For example:

"file" : "workflow/gettasksview.js"

or

"source" : "require('linkedView').fetch(request.resourcePath);"
apiDescription

JSON object, optional

Describes the custom endpoint and includes its documentation in the REST API Explorer.

Custom endpoints do not support versioning.

You must set authorization for any custom endpoints that you add, for example, by restricting the methods to the appropriate roles. For more information, refer to Authorization and Roles.

Custom endpoint scripts

The custom endpoint script files in the samples/example-configurations/custom-endpoint/script directory demonstrate all the HTTP operations that can be called by a script.

Each HTTP operation is associated with a method. Allowed methods are:

  • create

  • read

  • update

  • delete

  • patch

  • action

  • query

Requests sent to the custom endpoint return a list of the variables available to each method.

All scripts are invoked with a global request variable in their scope. This request structure carries all the information about the request.

Read requests on custom endpoints must not modify the state of the resource, either on the client or the server, as this can make them susceptible to Cross-Site Request Forgery (CSRF) exploits.

Endpoints which only read data without modifying state are inherently safe from CSRF attacks. This is consistent with the US National Security Agency’s Guidelines for Implementation of REST, which states, "... CSRF protections need only be applied to endpoints that will modify information in some way."

Custom endpoint scripts must return a JSON object. The structure of the return object depends on the method in the request.

The following example shows the create method in the echo.js file:

if (request.method === "create") {
    return {
        method: "create",
        resourceName: request.resourcePath,
        newResourceId: request.newResourceId,
        parameters: request.additionalParameters,
        content: request.content,
        context: context.current
    }
}

The following example shows the query method in the echo.groovy file:

else if (request instanceof QueryRequest) {
    // query results must be returned as a list of maps
    return [
        [
            method: "query",
            resourceName: request.resourcePath,
            pagedResultsCookie: request.pagedResultsCookie,
            pagedResultsOffset: request.pagedResultsOffset,
            pageSize: request.pageSize,
            queryId: request.queryId,
            queryFilter: request.queryFilter.toString(),
            parameters: request.additionalParameters,
            context: context.toJsonValue().getObject()
        ]
    ]
}

Depending on the method, the variables available to the script can include the following:

resourceName

The name of the resource without the endpoint/ prefix, such as echo.

newResourceId

The identifier of the new object available as the results of a create request.

revision

The revision of the object.

parameters

Any additional parameters provided in the request. The sample code returns request parameters from an HTTP GET with ?param=x, as "parameters":{"param":"x"}.

content

Content based on the latest revision of the object, using getObject.

context

The context of the request, including headers and security. For more information, refer to Request context chain.

Paging parameters

The pagedResultsCookie, pagedResultsOffset, and pageSize parameters are specific to query methods. For more information refer to Page Query Results.

Query parameters

The queryId and queryFilter parameters are specific to query methods. For more information, refer to Construct Queries.

Script exceptions

Some custom endpoint scripts require exception-handling logic. To return meaningful messages in REST responses and in logs, you must comply with the language-specific method of throwing errors.

A script written in JavaScript should comply with the following exception format:

throw {
    "code": 400, // any valid HTTP error code
    "message": "custom error message",
    "detail" : {
        "var": parameter1,
        "complexDetailObject" : [
            "detail1",
            "detail2"
        ]
    }
}

Exception objects include the specified HTTP error code, the corresponding HTTP error message (such as Bad Request), a custom error message, and additional details that may be helpful to determine what actions need to be taken to fix the error.

A script written in Groovy should comply with the following exception format:

import org.forgerock.json.resource.ResourceException
import org.forgerock.json.JsonValue

throw new ResourceException(404, "Your error message").setDetail(new JsonValue([
    "var": "parameter1",
    "complexDetailObject" : [
        "detail1",
        "detail2"
    ]
]))

Write an API descriptor for a custom endpoint

Most IDM endpoints are described in the REST API Explorer. Documentation is not generated automatically for custom endpoints.

To generate the documentation for your custom endpoint in the API Explorer, add an apiDescription object to your custom endpoint configuration file. The apiDescription object includes the following properties:

title

The endpoint name that expresses its purpose, for example, Audit, or Authentication.

description

A description of the endpoint.

mvccSupported

A Boolean value that indicates whether object versioning is supported. To enable If-None-Match or If-Match headers in read, delete, and patch requests, this property must be true.

Operations

An object that describes each operation supported on that endpoint (create, read, update, delete, patch, actions, and queries).

resourceSchema

The schema for the objects at this endpoint.

To refer to examples of the API descriptors included in IDM, log in to the admin UI, then point your browser to http://localhost:8080/openidm?_crestapi.

Compare the descriptors at that URL with what you refer to in the API Explorer.

In addition, the sample configuration file (openidm/samples/example-configurations/custom-endpoint/conf/endpoint-echo.json) shows how API descriptors must be constructed:

Sample API Descriptor Object 
{
    "apiDescription" : {
        "title" : "Echo",
        "description" : "Service that echo's your HTTP requests.",
        "mvccSupported" : false,
        "create" : {
            "description" : "Echo a CREATE request.",
            "mode" : "ID_FROM_SERVER",
            "singleton" : false
        },
        "read" : { "description" : "Echo a READ request." },
        "update" : { "description" : "Echo an UPDATE request." },
        "delete" : { "description" : "Echo a DELETE request." },
        "patch" : {
            "description" : "Echo a PATCH request.",
            "operations" : [ "ADD", "REMOVE", "REPLACE", "INCREMENT", "COPY", "MOVE", "TRANSFORM" ]
        },
        "actions" : [
            {
                "description" : "Echo an ACTION request.",
                "name" : "echo",
                "request" : { "type" : "object" },
                "response" : {
                    "title" : "Echo action response",
                    "type" : "object",
                    "properties" : {
                        "method" : {
                            "type" : "string",
                            "enum" : [ "action" ]
                        },
                        "action" : { "type" : "string" },
                        "content" : { "type" : "object" },
                        "parameters" : { "type" : "object" },
                        "context" : { "type" : "object" }
                    }
                }
            }
        ],
        "queries" : [
            {
                "description" : "Echo a query-filter request.",
                "type" : "FILTER",
                "queryableFields" : [ "*" ]
            },
            {
                "description" : "Echo a query-all request.",
                "type" : "ID",
                "queryId" : "query-all"
            },
            {
                "description" : "Echo a query-all-ids request.",
                "type" : "ID",
                "queryId" : "query-all-ids"
            }
        ],
        "resourceSchema" : {
            "title" : "Echo resource",
            "type" : "object",
            "properties" : {
                "method" : {
                    "title" : "CREST method",
                    "type" : "string"
                },
                "resourceName" : { "type" : "string" },
                "parameters" : { "type" : "object" },
                "context" : { "type" : "object" }
            }
        }
    }
}

This object generates API documentation in the API explorer that looks like this:

echo-api-descriptor