sbt-downloader/Program.cs

using PowerArgs;
using Newtonsoft.Json.Linq;
using System.Net;

namespace SBT_Downloader
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Welcome to the Sound Booth Theater Personal Archiving Tool!");
            try
            {
                var parsed = Args.Parse<MyArgs>(args);
                Console.WriteLine("Downloading book now...");
                DownloadBook(parsed.Har);
            }
            catch (ArgException ex)
            {
                Console.WriteLine(ex.Message);
                Console.WriteLine(ArgUsage.GenerateUsageFromTemplate<MyArgs>());
            }
        }

        static void DownloadBook(string fileName)
        {
            string harContents = LoadHar(fileName);
            JObject harObject = JObject.Parse(harContents);
            List<string> mp3Urls = ParseUrls(harObject);
            _ = DownloadMp3sAsync(mp3Urls);
        }

        private static async Task DownloadMp3sAsync(List<string> mp3Urls)
        {
            int fileNumber = 1;
            foreach (string url in mp3Urls)
            {
                using var client = new WebClient();
                client.DownloadFile(url, "file" + fileNumber + ".mp3");
                Console.WriteLine("Downloading  file #" +  fileNumber);
                fileNumber++;
            }
        }

        static string LoadHar(string harFileName)
        {
            string harContents;
            try
            {
                using StreamReader streamReader = new(harFileName);
                harContents = streamReader.ReadToEnd();
                return harContents;
            }
            catch (Exception e)
            {
                Console.WriteLine("The file could not be read:");
                Console.WriteLine(e.Message);
                Environment.Exit(0);
                return string.Empty;
            }
        }

        static List<string> ParseUrls(JObject harObject)
        {
            List<string> urls = harObject["log"]["entries"]
                .Where(x => x.SelectToken("_resourceType").ToString() == "media")
                .Select(y => y.SelectToken("request"))
                .DistinctBy(z => z.SelectToken("url"))
                .Select(x => x.SelectToken("url").ToString()).ToList();

            Console.WriteLine(urls.Count + " total requests");

            return urls;
        }

    }
}