本文是介绍aws 作为api gateway，用asp.net core用web应用，.net core作为aws lambda function。

api gateway和asp.net core的用处不废话，直接上操作步骤。

首先在asw的凭据管理中添加操作的用户和角色，步骤如下：

 

注意选择的策略名称

 

下载csv备用

 

 

 

 安装aws的visual studio插件

 

 加载备用csv文件

 

 

 创建asw lambda funcation项目

 

代码如下： 

using System;

using Amazon.Lambda.APIGatewayEvents;

using Amazon.Lambda.Core;

using Microsoft.IdentityModel.Tokens;

using System.Collections.Generic;

using System.IdentityModel.Tokens.Jwt;

using System.Linq;

using System.Security.Claims;

using System.Text;

 

 

[assembly: LambdaSerializer(typeof(Amazon.Lambda.Serialization.Json.JsonSerializer))]

namespace API01AWSLambda

{

    public class Function

    {

 

        /// <summary>

        ///验证Token的Lambda函数

        /// </summary>

        /// <param name="apigAuthRequest">请求</param>

        /// <param name="context">上下文</param>

        /// <returns></returns>

        public APIGatewayCustomAuthorizerResponse FunctionHandler(APIGatewayCustomAuthorizerRequest apigAuthRequest, ILambdaContext context)

        {

            LambdaLogger.Log($"AWS Lambda函数验证Token开始");

            var TokenValidationParameters = new TokenValidationParameters

            {

                ValidateIssuer = true,

                ValidateIssuerSigningKey = true,

                ValidIssuer = SecurityConstants.Issuer,

                ValidateAudience = true,

                ValidAudience = SecurityConstants.Audience,

                ValidateLifetime = true,

                IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(SecurityConstants.SecurityKey)),

                ClockSkew = TimeSpan.Zero,

            };

            var authorized = false;

            //删除Bearer再来验证

            var token = apigAuthRequest.AuthorizationToken?.Replace("Bearer ", "");

            if (!string.IsNullOrWhiteSpace(token))

            {

                try

                {

                    SecurityToken validatedToken;

                    var handler = new JwtSecurityTokenHandler();

                    var user = handler.ValidateToken(token, TokenValidationParameters, out validatedToken);

                    var claim = user.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Name);

                    if (claim != null)

                    {

                        authorized = claim.Value == SecurityConstants.ClaimName;

                    }

                }

                catch (Exception ex)

                {

                    LambdaLogger.Log($"Error occurred validating token: {ex.Message}");

                }

            }

            var policy = new APIGatewayCustomAuthorizerPolicy

            {

                Version = "2012-10-17",

                Statement = new List<APIGatewayCustomAuthorizerPolicy.IAMPolicyStatement>(),

 

            };

            policy.Statement.Add(new APIGatewayCustomAuthorizerPolicy.IAMPolicyStatement

            {

                Action = new HashSet<string>(new string[] { "execute-api:Invoke" }),

                Effect = authorized ? "Allow" : "Deny",

                Resource = new HashSet<string>(new string[] { apigAuthRequest.MethodArn })

 

            });