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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`.
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.
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.