mgjam

#set($origin = $input.params(\"Origin\"))
#if($origin == \"\")
    #set($origin = $input.params(\"origin\"))
#end
#if($origin.matches(\"https://my-origin-1.com\") || $origin.matches(\"https://my-origin-2.com\")
	#set($context.responseOverride.header.Access-Control-Allow-Origin = $origin)
#end

mgjam

import { Cors, Resource } from "@aws-cdk/aws-apigateway";

// existing const resource: Resource

resource.addResource('MyCorsResource', { 
    defaultCorsPreflightOptions: {
        allowOrigins: ['https://my-origin-1.com', 'https://my-origin-2.com'],
        allowHeaders: Cors.DEFAULT_HEADERS.concat(['x-api-key'])
    }
});

mgjam

public class LambdaProxyInput
{
    //...other properties

    public Dictionary<string, string[]> multiValueQueryStringParameters { get; set; }
}

public object MyHandler(LambdaProxyInput input, ILambdaContext context)
{
    var myArrayValues = input.multiValueQueryStringParameters["MyQuerystringArray"];

mgjam

{
  ...,
  "multiValueQueryStringParameters": {
    "parameter1": [
      "value1",
      "value2"
    ],
    "parameter2": [
      "value"
    ]

mgjam

// myApiResource: Resource defined

myApiResource.addMethod(
    ...http_method...,
    {
        ...lambda_integration_options...
        requestTemplates: 'application/json': `{
            "MyQueryStringValue": "$input.params('MyQueryStringValue')"
            #if ($input.params('MyQuerystringArray') != '')
            ,"MyQuerystringArray": $input.params('MyQuerystringArray')

mgjam

class MyDto
{
    public string MyQueryStringValue { get; set; }
    public string[] MyQuerystringArray { get; set; }
}

mgjam

var serviceCollection = new ServiceCollection();

serviceCollection.AddTransient<IHttpService, HttpService>();
serviceCollection.AddTransient<IService, LoggingService>();

mgjam

class Processor
{
    // .. dependencies

    void Process(MyInput input)
    {
        if (ValidateInput(input))
        {
            new DatabaseConnection(...).ExecuteSql("...");
        }

mgjam

class EmailValidator
{
    private readonly IEnumerable<IEmailValidation> emailValidations;
    /*...ctor...*/
    bool IsEmailValid(string email) => emailValidations
        .Aggregate(true, (acc, src) => acc ? src.IsEmailValid(email) : acc);
}

interface IEmailValidation
{

mgjam

class EmailValidator
{
    private readonly IEmailLengthValidation emailLengthValidation;
    private readonly IEmailRegexValidation emailRegexValidation;
    private readonly IEmailBlacklistValidation emailBlacklistValidation;

    bool IsEmailValid(string email)
    {
        if (!emailLengthValidation.IsEmailValid(email)) return false;
        if (!emailRegexValidation.IsEmailValid(email)) return false;