main.swift

import AWSLambdaEvents
import AWSLambdaRuntime
import NIO

import Foundation
#if canImport(FoundationNetworking)
import FoundationNetworking
#endif

Lambda.run { (context: Lambda.Context, event: APIGateway.Request, callback: @escaping (Result<APIGateway.Response, Error>) -> Void) in
    guard
        let data = event.body?.data(using: .utf8),
        let json = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any],
        var message = json["message"] as? [String: Any]
    else {
        callback(.success(APIGateway.Response(statusCode: .ok)))
        return
    }
    
    // rewrite message's text with redacted version
    message["text"] = redactCreditCardNumbers(from: text)
    
    let body = ["message": message]
    let bodyData = try! JSONSerialization.data(withJSONObject: body)
    let string = String(data: bodyData, encoding: .utf8)
    
    callback(.success(APIGateway.Response(statusCode: .ok, body: string)))
}