class CfnFunction (construct)

Language	Type name
.NET	`Amazon.CDK.AWS.CloudFront.CfnFunction`
Java	`software.amazon.awscdk.services.cloudfront.CfnFunction`
Python	`aws_cdk.aws_cloudfront.CfnFunction`
TypeScript	`@aws-cdk/aws-cloudfront` » `CfnFunction`

Implements IConstruct, IConstruct, IDependable, IInspectable

A CloudFormation AWS::CloudFront::Function.

Creates a CloudFront function.

To create a function, you provide the function code and some configuration information about the function. The response contains an Amazon Resource Name (ARN) that uniquely identifies the function, and the function’s stage.

By default, when you create a function, it’s in the DEVELOPMENT stage. In this stage, you can test the function in the CloudFront console (or with TestFunction in the CloudFront API).

When you’re ready to use your function with a CloudFront distribution, publish the function to the LIVE stage. You can do this in the CloudFront console, with PublishFunction in the CloudFront API, or by updating the AWS::CloudFront::Function resource with the AutoPublish property set to true . When the function is published to the LIVE stage, you can attach it to a distribution’s cache behavior, using the function’s ARN.

To automatically publish the function to the LIVE stage when it’s created, set the AutoPublish property to true .

Example

// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import * as cloudfront from '@aws-cdk/aws-cloudfront';
const cfnFunction = new cloudfront.CfnFunction(this, 'MyCfnFunction', {
  functionCode: 'functionCode',
  functionConfig: {
    comment: 'comment',
    runtime: 'runtime',
  },
  name: 'name',

  // the properties below are optional
  autoPublish: false,
  functionMetadata: {
    functionArn: 'functionArn',
  },
});

Initializer

new CfnFunction(scope: Construct, id: string, props: CfnFunctionProps)

Parameters

scope Construct — - scope in which this resource is defined.
id string — - scoped id of the resource.
props CfnFunctionProps — - resource properties.

Create a new AWS::CloudFront::Function.

Construct Props

Name	Type	Description
functionCode	`string`	The function code.
functionConfig	`IResolvable` `\|` `FunctionConfigProperty`	Contains configuration information about a CloudFront function.
name	`string`	A name to identify the function.
autoPublish?	`boolean \|` `IResolvable`	A flag that determines whether to automatically publish the function to the `LIVE` stage when it’s created.
functionMetadata?	`IResolvable` `\|` `FunctionMetadataProperty`	Contains metadata about a CloudFront function.

functionCode

Type: string

The function code.

For more information about writing a CloudFront function, see Writing function code for CloudFront Functions in the Amazon CloudFront Developer Guide .

functionConfig

Type: IResolvable | FunctionConfigProperty

Contains configuration information about a CloudFront function.

name

Type: string

A name to identify the function.

autoPublish?

Type: boolean | IResolvable (optional)

A flag that determines whether to automatically publish the function to the LIVE stage when it’s created.

To automatically publish to the LIVE stage, set this property to true .

functionMetadata?

Type: IResolvable | FunctionMetadataProperty (optional)

Contains metadata about a CloudFront function.

Properties

Name	Type	Description
attrFunctionArn	`string`	The ARN of the function. For example:.
attrFunctionMetadataFunctionArn	`string`	The Amazon Resource Name (ARN) of the function.
attrStage	`string`
cfnOptions	`ICfnResourceOptions`	Options for this resource, such as condition, update policy etc.
cfnProperties	`{ [string]: any }`
cfnResourceType	`string`	AWS resource type.
creationStack	`string[]`
functionCode	`string`	The function code.
functionConfig	`IResolvable` `\|` `FunctionConfigProperty`	Contains configuration information about a CloudFront function.
logicalId	`string`	The logical ID for this CloudFormation stack element.
name	`string`	A name to identify the function.
node	`ConstructNode`	The construct tree node associated with this construct.
ref	`string`	Return a string that will be resolved to a CloudFormation `{ Ref }` for this element.
stack	`Stack`	The stack in which this element is defined.
autoPublish?	`boolean \|` `IResolvable`	A flag that determines whether to automatically publish the function to the `LIVE` stage when it’s created.
functionMetadata?	`IResolvable` `\|` `FunctionMetadataProperty`	Contains metadata about a CloudFront function.
static CFN_RESOURCE_TYPE_NAME	`string`	The CloudFormation resource type name for this resource class.

attrFunctionArn

Type: string

The ARN of the function. For example:.

arn:aws:cloudfront::123456789012:function/ExampleFunction .

To get the function ARN, use the following syntax:

!GetAtt *Function_Logical_ID* .FunctionMetadata.FunctionARN

attrFunctionMetadataFunctionArn

Type: string

The Amazon Resource Name (ARN) of the function.

The ARN uniquely identifies the function.

attrStage

Type: string

cfnOptions

Type: ICfnResourceOptions

Options for this resource, such as condition, update policy etc.

cfnProperties

Type: { [string]: any }

cfnResourceType

Type: string

AWS resource type.

creationStack

Type: string[]

functionCode

Type: string

The function code.

For more information about writing a CloudFront function, see Writing function code for CloudFront Functions in the Amazon CloudFront Developer Guide .

functionConfig

Type: IResolvable | FunctionConfigProperty

Contains configuration information about a CloudFront function.

logicalId

Type: string

The logical ID for this CloudFormation stack element.

The logical ID of the element is calculated from the path of the resource node in the construct tree.

To override this value, use overrideLogicalId(newLogicalId).

name

Type: string

A name to identify the function.

node

Type: ConstructNode

The construct tree node associated with this construct.

ref

Type: string

Return a string that will be resolved to a CloudFormation { Ref } for this element.

If, by any chance, the intrinsic reference of a resource is not a string, you could coerce it to an IResolvable through Lazy.any({ produce: resource.ref }).

stack

Type: Stack

The stack in which this element is defined.

CfnElements must be defined within a stack scope (directly or indirectly).

autoPublish?

Type: boolean | IResolvable (optional)

A flag that determines whether to automatically publish the function to the LIVE stage when it’s created.

To automatically publish to the LIVE stage, set this property to true .

functionMetadata?

Type: IResolvable | FunctionMetadataProperty (optional)

Contains metadata about a CloudFront function.

static CFN_RESOURCE_TYPE_NAME

Type: string

The CloudFormation resource type name for this resource class.

Methods

Name	Description
addDeletionOverride(path)	Syntactic sugar for `addOverride(path, undefined)`.
addDependsOn(target)	Indicates that this resource depends on another resource and cannot be provisioned unless the other resource has been successfully provisioned.
addMetadata(key, value)	Add a value to the CloudFormation Resource Metadata.
addOverride(path, value)	Adds an override to the synthesized CloudFormation resource.
addPropertyDeletionOverride(propertyPath)	Adds an override that deletes the value of a property from the resource definition.
addPropertyOverride(propertyPath, value)	Adds an override to a resource property.
applyRemovalPolicy(policy?, options?)	Sets the deletion policy of the resource based on the removal policy specified.
getAtt(attributeName)	Returns a token for an runtime attribute of this resource.
getMetadata(key)	Retrieve a value value from the CloudFormation Resource Metadata.
inspect(inspector)	Examines the CloudFormation resource and discloses attributes.
overrideLogicalId(newLogicalId)	Overrides the auto-generated logical ID with a specific ID.
toString()	Returns a string representation of this construct.
protected renderProperties(props)

addDeletionOverride(path)

public addDeletionOverride(path: string): void

Parameters

path string — The path of the value to delete.

Syntactic sugar for addOverride(path, undefined).

addDependsOn(target)

public addDependsOn(target: CfnResource): void

Parameters

target CfnResource

Indicates that this resource depends on another resource and cannot be provisioned unless the other resource has been successfully provisioned.

This can be used for resources across stacks (or nested stack) boundaries and the dependency will automatically be transferred to the relevant scope.

addMetadata(key, value)

public addMetadata(key: string, value: any): void

Parameters

key string
value any

Add a value to the CloudFormation Resource Metadata.

Note that this is a different set of metadata from CDK node metadata; this metadata ends up in the stack template under the resource, whereas CDK node metadata ends up in the Cloud Assembly.](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/metadata-section-structure.html

Note that this is a different set of metadata from CDK node metadata; this metadata ends up in the stack template under the resource, whereas CDK node metadata ends up in the Cloud Assembly.)

addOverride(path, value)

public addOverride(path: string, value: any): void

Parameters

path string — - The path of the property, you can use dot notation to override values in complex types.
value any — - The value.

Adds an override to the synthesized CloudFormation resource.

To add a property override, either use addPropertyOverride or prefix path with "Properties." (i.e. Properties.TopicName).

If the override is nested, separate each nested level using a dot (.) in the path parameter. If there is an array as part of the nesting, specify the index in the path.

To include a literal . in the property name, prefix with a \. In most programming languages you will need to write this as "\\." because the \ itself will need to be escaped.

For example,

cfnResource.addOverride('Properties.GlobalSecondaryIndexes.0.Projection.NonKeyAttributes', ['myattribute']);
cfnResource.addOverride('Properties.GlobalSecondaryIndexes.1.ProjectionType', 'INCLUDE');

would add the overrides

"Properties": {
   "GlobalSecondaryIndexes": [
     {
       "Projection": {
         "NonKeyAttributes": [ "myattribute" ]
         ...
       }
       ...
     },
     {
       "ProjectionType": "INCLUDE"
       ...
     },
   ]
   ...
}

The value argument to addOverride will not be processed or translated in any way. Pass raw JSON values in here with the correct capitalization for CloudFormation. If you pass CDK classes or structs, they will be rendered with lowercased key names, and CloudFormation will reject the template.

addPropertyDeletionOverride(propertyPath)

public addPropertyDeletionOverride(propertyPath: string): void

Parameters

propertyPath string — The path to the property.

Adds an override that deletes the value of a property from the resource definition.

addPropertyOverride(propertyPath, value)

public addPropertyOverride(propertyPath: string, value: any): void

Parameters

propertyPath string — The path of the property.
value any — The value.

Adds an override to a resource property.

Syntactic sugar for addOverride("Properties.<...>", value).

applyRemovalPolicy(policy?, options?)

public applyRemovalPolicy(policy?: RemovalPolicy, options?: RemovalPolicyOptions): void

Parameters

policy RemovalPolicy
options RemovalPolicyOptions

Sets the deletion policy of the resource based on the removal policy specified.

The Removal Policy controls what happens to this resource when it stops being managed by CloudFormation, either because you've removed it from the CDK application or because you've made a change that requires the resource to be replaced.

The resource can be deleted (RemovalPolicy.DESTROY), or left in your AWS account for data recovery and cleanup later (RemovalPolicy.RETAIN).

getAtt(attributeName)

public getAtt(attributeName: string): Reference

Parameters

attributeName string — The name of the attribute.

Returns

Reference

Returns a token for an runtime attribute of this resource.

Ideally, use generated attribute accessors (e.g. resource.arn), but this can be used for future compatibility in case there is no generated attribute.

getMetadata(key)

public getMetadata(key: string): any

Parameters

key string

Returns

any

Retrieve a value value from the CloudFormation Resource Metadata.

Note that this is a different set of metadata from CDK node metadata; this metadata ends up in the stack template under the resource, whereas CDK node metadata ends up in the Cloud Assembly.)

inspect(inspector)

public inspect(inspector: TreeInspector): void

Parameters

inspector TreeInspector — - tree inspector to collect and process attributes.

Examines the CloudFormation resource and discloses attributes.

overrideLogicalId(newLogicalId)

public overrideLogicalId(newLogicalId: string): void

Parameters

newLogicalId string — The new logical ID to use for this stack element.

Overrides the auto-generated logical ID with a specific ID.

toString()

public toString(): string

Returns

string

Returns a string representation of this construct.

protected renderProperties(props)

protected renderProperties(props: { [string]: any }): { [string]: any }

Parameters

props { [string]: any }

Returns

{ [string]: any }