Pick an IP address up off a queue and block it in CloudFlare

BlockIpAtCloudFlare.csx

using System;
using System.Configuration;

public static void Run(string myQueueItem, TraceWriter log)
{
  log.Info($"C# Queue trigger function processed: {myQueueItem}");
  BlockIp(myQueueItem).Wait();
}

static async Task BlockIp(string ipAddress)
{
  var zoneId = ConfigurationManager.AppSettings["ZoneId"];
  var xAuthEmail = ConfigurationManager.AppSettings["X-Auth-Email"];
  var xAuthKey = ConfigurationManager.AppSettings["X-Auth-Key"];

  var path = $"/client/v4/zones/{zoneId}/firewall/access_rules/rules";
  var body = new
  {
    mode = "js_challenge",
    configuration = new
    {
      target = "ip",
      value = ipAddress
    },
    notes = $"rate-limit-abuse-{DateTime.UtcNow.ToString("s")}"
  };

  using (var client = new HttpClient())
  {
    client.BaseAddress = new Uri("https://api.cloudflare.com");
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Add("X-Auth-Email", xAuthEmail);
    client.DefaultRequestHeaders.Add("X-Auth-Key", xAuthKey);

    await client.PostAsJsonAsync(path, body);
  }
}