ipgiraffe.com/lambda_test.cs at main · doritoes/ipgiraffe.com · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
using Amazon.Lambda.APIGatewayEvents;
using Amazon.Lambda.Core;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

// Assembly attribute to enable the Lambda function's JSON input to be converted into a .NET class.
[assembly: LambdaSerializer(typeof(Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer))]

namespace myip
{
    public class MyEventInput
    {
        public string sourceIp { get; set; }
        public string xForwardedFor { get; set; }
    }
    public class Function
    {
        public APIGatewayProxyResponse FunctionHandler(MyEventInput input, ILambdaContext context)
        {
            string clientIp = "IP Address Not Found"; // Default

            if (input != null)
            {
                // 1. Prioritize "X-Forwarded-For" header
                if (!string.IsNullOrEmpty(input.xForwardedFor))
                {
                    string[] forwardedIps = input.xForwardedFor.Split(',');
                    clientIp = forwardedIps[0].Trim(); // Extract the first IP
                }
                // 2. Fallback to "sourceIp"
                if (clientIp == "IP Address Not Found" && !string.IsNullOrEmpty(input.sourceIp))
                {
                    clientIp = input.sourceIp;
                }
            }
            // Build the HTML response using string interpolation
            string htmlResponse = $@"
                <html>
                <body>
                    <h1>Your IP Address</h1>
                    <p>{clientIp}</p>
                </body>
                </html>
            ";
            return new APIGatewayProxyResponse
            {
                StatusCode = 200,
                Body = htmlResponse,
                Headers = new Dictionary<string, string> { { "Content-Type", "text/html" } }
            };
        }
    }
}