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Custom resource request objects

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Template developer request properties

The template developer uses the AWS CloudFormation resource, AWS::CloudFormation::CustomResource, to specify a custom resource in a template.

AWS::CloudFormation::CustomResource

In `AWS::CloudFormation::CustomResource`, all properties are defined by the custom resource provider. There is only one required property: `ServiceToken`.

ServiceToken

The service token (an Amazon SNS topic or AWS Lambda function Amazon Resource Name) that is obtained from the custom resource provider to access the service. The service token must be in the same region in which you are creating the stack.

• Required*: Yes
• Type*: String

All other fields in the resource properties are optional and are sent, verbatim, to the custom resource provider in the request's `ResourceProperties` field. The provider defines both the names and the valid contents of these fields.

Custom resource provider request fields

These fields are sent in JSON requests from AWS CloudFormation to the custom resource provider in the SNS topic that the provider has configured for this purpose.

RequestType

The request type is set by the AWS CloudFormation stack operation (create-stack, update-stack, or delete-stack) that was initiated by the template developer for the stack that contains the custom resource.

Must be one of: `Create`, `Update`, or `Delete`. For more information, see Custom resource request types.

• Required*: Yes
• Type*: String

Custom resource request types

ResponseURL

The response URL identifies a presigned S3 bucket that receives responses from the custom resource provider to AWS CloudFormation.

• Required*: Yes
• Type*: String

StackId

The Amazon Resource Name (ARN) that identifies the stack that contains the custom resource.

Combining the `StackId` with the `RequestId` forms a value that you can use to uniquely identify a request on a particular custom resource.

• Required*: Yes
• Type*: String

RequestId

A unique ID for the request.

Combining the `StackId` with the `RequestId` forms a value that you can use to uniquely identify a request on a particular custom resource.

• Required*: Yes
• Type*: String

ResourceType

The template developer-chosen resource type of the custom resource in the AWS CloudFormation template. Custom resource type names can be up to 60 characters long and can include alphanumeric and the following characters: `_@-`.

• Required*: Yes
• Type*: String

LogicalResourceId

The template developer-chosen name (logical ID) of the custom resource in the AWS CloudFormation template. This is provided to facilitate communication between the custom resource provider and the template developer.

• Required*: Yes
• Type*: String

PhysicalResourceId

A required custom resource provider-defined physical ID that is unique for that provider.

• Required*: Always sent with `Update` and `Delete` requests; never sent with `Create`.
• Type*: String

ResourceProperties

This field contains the contents of the `Properties` object sent by the template developer. Its contents are defined by the custom resource provider.

• Required*: No
• Type*: JSON object

OldResourceProperties

Used only for `Update` requests. Contains the resource properties that were declared previous to the update request.

• Required*: Yes
• Type*: JSON object