POST /2015-03-31/functions/{FunctionName}/policy

Grants an Amazon Web Service, Amazon Web Services account, or Amazon Web Services organization permission to use a function. You can apply the policy at the function level, or specify a qualifier to restrict access to a single version or alias. If you use a qualifier, the invoker must use the full Amazon Resource Name (ARN) of that version or alias to invoke the function. Note: Lambda does not support adding policies to version $LATEST.

To grant permission to another account, specify the account ID as the Principal. To grant permission to an organization defined in Organizations, specify the organization ID as the PrincipalOrgID. For Amazon Web Services, the principal is a domain-style identifier that the service defines, such as s3.amazonaws.com or sns.amazonaws.com. For Amazon Web Services, you can also specify the ARN of the associated resource as the SourceArn. If you grant permission to a service principal without specifying the source, other accounts could potentially configure resources in their account to invoke your Lambda function.

This operation adds a statement to a resource-based permissions policy for the function. For more information about function policies, see Using resource-based policies for Lambda.

Servers

https://lambda.{region}.amazonaws.com
https://lambda.{region}.amazonaws.com.cn

Path parameters

Name Type Required Description

Name	Type	Required	Description
`FunctionName`	String	Yes	The name of the Lambda function, version, or alias. Name formats Function name – `my-function` (name-only), `my-function:v1` (with alias). Function ARN – `arn:aws:lambda:us-west-2:123456789012:function:my-function`. Partial ARN – `123456789012:function:my-function`. You can append a version number or alias to any of the formats. The length constraint applies only to the full ARN. If you specify only the function name, it is limited to 64 characters in length.

FunctionName

String

Yes

The name of the Lambda function, version, or alias.

Name formats

Function name – my-function (name-only), my-function:v1 (with alias).
Function ARN – arn:aws:lambda:us-west-2:123456789012:function:my-function.
Partial ARN – 123456789012:function:my-function.

You can append a version number or alias to any of the formats. The length constraint applies only to the full ARN. If you specify only the function name, it is limited to 64 characters in length.

Request headers

Name	Type	Required	Description
`X-Amz-Content-Sha256`	String	No
`X-Amz-Credential`	String	No
`Content-Type`	String	Yes	The media type of the request body. Default value: "application/json"
`X-Amz-Date`	String	No
`X-Amz-Algorithm`	String	No
`X-Amz-SignedHeaders`	String	No
`X-Amz-Security-Token`	String	No
`X-Amz-Signature`	String	No

Query parameters

Name	Type	Required	Description
`Qualifier`	String	No	Specify a version or alias to add permissions to a published version of the function.

Request body fields

Name	Type	Required	Description
`SourceArn`	String	No	For Amazon Web Services, the ARN of the Amazon Web Services resource that invokes the function. For example, an Amazon S3 bucket or Amazon SNS topic. Note that Lambda configures the comparison using the `StringLike` operator.
`SourceAccount`	String	No	For Amazon Web Service, the ID of the Amazon Web Services account that owns the resource. Use this together with `SourceArn` to ensure that the specified account owns the resource. It is possible for an Amazon S3 bucket to be deleted by its owner and recreated by another account.
`StatementId`	String	Yes	A statement identifier that differentiates the statement from others in the same policy.
`Principal`	String	Yes	The Amazon Web Service or Amazon Web Services account that invokes the function. If you specify a service, use `SourceArn` or `SourceAccount` to limit who can invoke the function through that service.
`RevisionId`	String	No	Update the policy only if the revision ID matches the ID that's specified. Use this option to avoid modifying a policy that has changed since you last read it.
`FunctionUrlAuthType`	String	No	The type of authentication that your function URL uses. Set to `AWS_IAM` if you want to restrict access to authenticated users only. Set to `NONE` if you want to bypass IAM authentication to create a public endpoint. For more information, see Security and auth model for Lambda function URLs. Possible values: `"AWS_IAM"` `"NONE"`
`EventSourceToken`	String	No	For Alexa Smart Home functions, a token that the invoker must supply.
`PrincipalOrgID`	String	No	The identifier for your organization in Organizations. Use this to grant permissions to all the Amazon Web Services accounts under this organization.
`Action`	String	Yes	The action that the principal can use on the function. For example, `lambda:InvokeFunction` or `lambda:GetFunction`.

How to start integrating

Add HTTP Task to your workflow definition.
Search for the API you want to integrate with and click on the name.
- This loads the API reference documentation and prepares the Http request settings.
Click Test request to test run your request to the API and see the API's response.