AWS::ApiGateway::Authorizer

The AWS::ApiGateway::Authorizer resource creates an authorization layer that API Gateway activates for methods that have authorization enabled. API Gateway activates the authorizer when a client calls those methods.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{
  "Type" : "AWS::ApiGateway::Authorizer",
  "Properties" : {
      "AuthorizerCredentials" : String,
      "AuthorizerResultTtlInSeconds" : Integer,
      "AuthorizerUri" : String,
      "AuthType" : String,
      "IdentitySource" : String,
      "IdentityValidationExpression" : String,
      "Name" : String,
      "ProviderARNs" : [ String, ... ],
      "RestApiId" : String,
      "Type" : String
    }
}

YAML

Type: AWS::ApiGateway::Authorizer
Properties:
  AuthorizerCredentials: String
  AuthorizerResultTtlInSeconds: Integer
  AuthorizerUri: String
  AuthType: String
  IdentitySource: String
  IdentityValidationExpression: String
  Name: String
  ProviderARNs: 
    - String
  RestApiId: String
  Type: String

Properties

AuthorizerCredentials

Specifies the required credentials as an IAM role for API Gateway to invoke the authorizer. To specify an IAM role for API Gateway to assume, use the role's Amazon Resource Name (ARN). To use resource-based permissions on the Lambda function, specify null.

Required: No

Type: String

Update requires: No interruption

AuthorizerResultTtlInSeconds

The TTL in seconds of cached authorizer results. If it equals 0, authorization caching is disabled. If it is greater than 0, API Gateway will cache authorizer responses. If this field is not set, the default value is 300. The maximum value is 3600, or 1 hour.

Required: No

Type: Integer

Update requires: No interruption

AuthorizerUri

Specifies the authorizer's Uniform Resource Identifier (URI). For TOKEN or REQUEST authorizers, this must be a well-formed Lambda function URI, for example, arn:aws:apigateway:us-west-2:lambda:path/2015-03-31/functions/arn:aws:lambda:us-west-2:{account_id}:function:{lambda_function_name}/invocations. In general, the URI has this form arn:aws:apigateway:{region}:lambda:path/{service_api}, where {region} is the same as the region hosting the Lambda function, path indicates that the remaining substring in the URI should be treated as the path to the resource, including the initial /. For Lambda functions, this is usually of the form /2015-03-31/functions/[FunctionARN]/invocations.

Required: No

Type: String

Update requires: No interruption

AuthType

Optional customer-defined field, used in OpenAPI imports and exports without functional impact.

Required: No

Type: String

Update requires: No interruption

IdentitySource

The identity source for which authorization is requested. For a TOKEN or COGNITO_USER_POOLS authorizer, this is required and specifies the request header mapping expression for the custom header holding the authorization token submitted by the client. For example, if the token header name is Auth, the header mapping expression is method.request.header.Auth. For the REQUEST authorizer, this is required when authorization caching is enabled. The value is a comma-separated string of one or more mapping expressions of the specified request parameters. For example, if an Auth header, a Name query string parameter are defined as identity sources, this value is method.request.header.Auth, method.request.querystring.Name. These parameters will be used to derive the authorization caching key and to perform runtime validation of the REQUEST authorizer by verifying all of the identity-related request parameters are present, not null and non-empty. Only when this is true does the authorizer invoke the authorizer Lambda function, otherwise, it returns a 401 Unauthorized response without calling the Lambda function. The valid value is a string of comma-separated mapping expressions of the specified request parameters. When the authorization caching is not enabled, this property is optional.

Required: No

Type: String

Update requires: No interruption

IdentityValidationExpression

A validation expression for the incoming identity token. For TOKEN authorizers, this value is a regular expression. For COGNITO_USER_POOLS authorizers, API Gateway will match the aud field of the incoming token from the client against the specified regular expression. It will invoke the authorizer's Lambda function when there is a match. Otherwise, it will return a 401 Unauthorized response without calling the Lambda function. The validation expression does not apply to the REQUEST authorizer.

Required: No

Type: String

Update requires: No interruption

Name

The name of the authorizer.

Required: Yes

Type: String

Update requires: No interruption

ProviderARNs

A list of the Amazon Cognito user pool ARNs for the COGNITO_USER_POOLS authorizer. Each element is of this format: arn:aws:cognito-idp:{region}:{account_id}:userpool/{user_pool_id}. For a TOKEN or REQUEST authorizer, this is not defined.

Required: No

Type: Array of String

Update requires: No interruption

RestApiId

The string identifier of the associated RestApi.

Required: Yes

Type: String

Update requires: Replacement

Type

The authorizer type. Valid values are TOKEN for a Lambda function using a single authorization token submitted in a custom header, REQUEST for a Lambda function using incoming request parameters, and COGNITO_USER_POOLS for using an Amazon Cognito user pool.

Required: Yes

Type: String

Update requires: No interruption

Return values

Ref

When you pass the logical ID of this resource to the intrinsic Ref function, Ref returns the authorizer's ID, such as abcde1.

For more information about using the Ref function, see Ref.

Fn::GetAtt

The Fn::GetAtt intrinsic function returns a value for a specified attribute of this type. The following are the available attributes and sample return values.

For more information about using the Fn::GetAtt intrinsic function, see Fn::GetAtt.

AuthorizerId

The ID for the authorizer. For example: abc123.

Examples

Create authorizer

The following examples create a custom authorizer that is an AWS Lambda function.

JSON

{
    "Authorizer": {
        "Type": "AWS::ApiGateway::Authorizer",
        "Properties": {
            "AuthorizerCredentials": {
                "Fn::GetAtt": [
                    "LambdaInvocationRole",
                    "Arn"
                ]
            },
            "AuthorizerResultTtlInSeconds": "300",
            "AuthorizerUri": {
                "Fn::Join": [
                    "",
                    [
                        "arn:aws:apigateway:",
                        {
                            "Ref": "AWS::Region"
                        },
                        ":lambda:path/2015-03-31/functions/",
                        {
                            "Fn::GetAtt": [
                                "LambdaAuthorizer",
                                "Arn"
                            ]
                        },
                        "/invocations"
                    ]
                ]
            },
            "Type": "TOKEN",
            "IdentitySource": "method.request.header.Auth",
            "Name": "DefaultAuthorizer",
            "RestApiId": {
                "Ref": "RestApi"
            }
        }
    }
}

YAML

Authorizer:
  Type: 'AWS::ApiGateway::Authorizer'
  Properties:
    AuthorizerCredentials: !GetAtt 
      - LambdaInvocationRole
      - Arn
    AuthorizerResultTtlInSeconds: '300'
    AuthorizerUri: !Join 
      - ''
      - - 'arn:aws:apigateway:'
        - !Ref 'AWS::Region'
        - ':lambda:path/2015-03-31/functions/'
        - !GetAtt 
          - LambdaAuthorizer
          - Arn
        - /invocations
    Type: TOKEN
    IdentitySource: method.request.header.Auth
    Name: DefaultAuthorizer
    RestApiId: !Ref RestApi

See also

• authorizer:create in the Amazon API Gateway REST API Reference