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use aws_lambda_events::apigw::{ ApiGatewayCustomAuthorizerRequestTypeRequest, ApiGatewayCustomAuthorizerResponse, ApiGatewayCustomAuthorizerPolicy, IamPolicyStatement, }; use lambda_runtime::{run, service_fn, Error, LambdaEvent}; use serde_json::json; #[tokio::main] async fn main() -> Result<(), Error> { tracing_subscriber::fmt() .with_ansi(false) .without_time() .with_max_level(tracing_subscriber::filter::LevelFilter::INFO) .init(); run(service_fn(function_handler)).await } pub async fn function_handler(event: LambdaEvent) -> Result { // do something with the event payload let method_arn = event.payload.method_arn.unwrap(); // for example we could use the authorization header if let Some(token) = event.payload.headers.get("authorization") { // do something with the token // my custom logic return Ok(custom_authorizer_response( "ALLOW", "some_principal", &method_arn, )); } Ok(custom_authorizer_response( &"DENY".to_string(), "", &method_arn)) } pub fn custom_authorizer_response(effect: &str, principal: &str, method_arn: &str) -> ApiGatewayCustomAuthorizerResponse { let stmt = IamPolicyStatement { action: vec!["execute-api:Invoke".to_string()], resource: vec![method_arn.to_owned()], effect: Some(effect.to_owned()), }; let policy = ApiGatewayCustomAuthorizerPolicy { version: Some("2012-10-17".to_string()), statement: vec![stmt], }; ApiGatewayCustomAuthorizerResponse { principal_id: Some(principal.to_owned()), policy_document: policy, context: json!({ "email": principal }), // https://github.com/awslabs/aws-lambda-rust-runtime/discussions/548 usage_identifier_key: None, } }
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