Rip albums from khinsider's collection

music-get.cs

using HtmlAgilityPack;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;

namespace music_get
{
    static class Program
    {
        // Consts
        const string requiredURL = "http://downloads.khinsider.com";

        static int Main(string[] args)
        {
            // Options
            bool createDirectory = false;
            bool verboseOutput = false;

            if (args.Length < 1)
            {
                Console.WriteLine("Usage:\nmusic-get url -[options]\nOptions:\n-d : Create enclosing directory\n-v : Verbose output");
                return 1;
            }

            Console.WriteLine("music-get v0.3");

            // Check if our argument is a valid url
            if (!args[0].Contains(requiredURL))
            {
                Console.WriteLine("Bad URL provided.  Must be a khinsider album page.");
                return 1;
            }

            // See if we have any options set
            if (args.Length == 2)
            {
                if (args[1].StartsWith("-"))
                {
                    verboseOutput = args[1].Contains("v");
                    createDirectory = args[1].Contains("d");
                }
                else
                {
                    Console.WriteLine("Options block must begin with a dash.");
                    return 1;
                }
            }

            // Get html of album listing page
            string pageHTML;
            using (var client = new WebClient())
            {
                pageHTML = client.DownloadString(args[0]);
            }

            HtmlDocument albumpageDog = new HtmlDocument();
            albumpageDog.LoadHtml(pageHTML);


            // Get list of urls for song pages
            List<string> songPageURLs = new List<string>();
            foreach (var node in albumpageDog.DocumentNode.SelectNodes("//a[.='Download']"))
            {
                songPageURLs.Add(node.Attributes["href"].Value);
                if (verboseOutput)
                    Console.WriteLine(node.Attributes["href"].Value);
            }

            // Download the HTML for each song page
            // Then pluck the URL for the actual mp3 out of the page and toss it in our list
            List<string> mp3urls = new List<string>();
            using (var client = new WebClient())
            {
                foreach (string pageURL in songPageURLs)
                {
                    HtmlDocument doc = new HtmlDocument();
                    doc.LoadHtml(client.DownloadString(pageURL));
                    mp3urls.Add(doc.DocumentNode.SelectSingleNode("//a[.='Click here to download']").Attributes["href"].Value);
                }
            }

            // Create directory (if option is set)
            if (createDirectory)
            {
                // Use last part of URL slug as folder name
                string albumName = args[0].LastSlice();
                if (verboseOutput)
                {
                    Console.WriteLine("Creating directory " + albumName);
                }
                Directory.CreateDirectory(albumName);
                Directory.SetCurrentDirectory(albumName);
            }

            // Download individual tracks

            Console.WriteLine("album: " + args[0].LastSlice() + "\nsongs: " + songPageURLs.Count);
            using (var client = new WebClient())
            {
                foreach (string song in mp3urls)
                {
                    string songName = song.LastSlice();
                    Console.Write(songName + "...");
                    client.DownloadFile(song, songName);
                    Console.WriteLine("done");
                }
            }

            return 0;
        }

        // Quick extension method to grab the final segment of a url
        private static string LastSlice(this string url)
        {
            var slices = url.Split('/');
            return slices[slices.Length - 1];
        }
    }
}