added application config

Controllers/PlayListController.cs

@@ -1,8 +1,10 @@
-using System.IO;
+using System;
+using System.IO;
 using System.Net.Http;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Configuration;
 
 namespace tv7playlist.Controllers
 {
@@ -10,19 +12,45 @@ namespace tv7playlist.Controllers
     [ApiController]
     public class PlayListController : ControllerBase
     {
-        private const string Tv7OriginUrl = "https://api.init7.net/tvchannels.m3u";
-        private const string UdpxyRootUrl = "http://192.168.15.2:4022/udp";
+        private const string PlayListContentType = "audio/mpegurl";
 
-        private static readonly Regex MulticastRegex = new Regex(@"(udp\:\/\/@)([0-9.:]+)",
+        private static readonly Regex MultiCastRegex = new Regex(@"(udp\:\/\/@)([0-9.:]+)",
             RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.IgnoreCase);
 
+        private readonly string _downloadFileName;
+        private readonly string _proxyUrl;
+
+        private readonly string _tv7Url;
+
+        public PlayListController(IConfiguration configuration)
+        {
+            if (configuration == null) throw new ArgumentNullException(nameof(configuration));
+
+            var appConfig = configuration.Get<AppConfig>();
+
+            _tv7Url = GetTv7Url(appConfig);
+            _proxyUrl = GetProxyUrl(appConfig);
+            _downloadFileName = GetDownloadFileName(appConfig);
+        }
+
         [HttpGet]
         public async Task<FileStreamResult> Get()
         {
-            var httpClient = new HttpClient();
-            var tv7Response = await httpClient.GetAsync(Tv7OriginUrl);
+            using (var httpClient = new HttpClient())
+            {
+                var tv7Response = await httpClient.GetAsync(_tv7Url);
 
+                var modifiedPlaylist = await BuildProxyPlaylist(tv7Response);
 
+                return new FileStreamResult(modifiedPlaylist, PlayListContentType)
+                {
+                    FileDownloadName = _downloadFileName
+                };
+            }
+        }
+
+        private async Task<MemoryStream> BuildProxyPlaylist(HttpResponseMessage tv7Response)
+        {
             var outStream = new MemoryStream();
             var outWriter = new StreamWriter(outStream);
 
@@ -32,7 +60,7 @@ namespace tv7playlist.Controllers
                 while (!reader.EndOfStream)
                 {
                     var line = await reader.ReadLineAsync();
-                    line = MulticastRegex.Replace(line, $"{UdpxyRootUrl}/$2/");
+                    line = MultiCastRegex.Replace(line, $"{_proxyUrl}/$2/");
                     outWriter.WriteLine(line);
                 }
 
@@ -40,7 +68,33 @@ namespace tv7playlist.Controllers
             }
 
             outStream.Seek(0, SeekOrigin.Begin);
-            return new FileStreamResult(outStream, "audio/mpegurl") {FileDownloadName = "PlaylistTV7udpxy.m3u"};
+
+            return outStream;
+        }
+
+        private string GetTv7Url(AppConfig configuration)
+        {
+            var tv7Url = configuration.TV7Url;
+            if (!Uri.IsWellFormedUriString(tv7Url, UriKind.Absolute))
+                throw new ApplicationException($"The TV7Url is set to {tv7Url}. This is not a well formed uri!");
+            return tv7Url;
+        }
+
+        private string GetProxyUrl(AppConfig configuration)
+        {
+            var proxyUrl = configuration.UdpxyUrl;
+            if (!Uri.IsWellFormedUriString(proxyUrl, UriKind.Absolute))
+                throw new ApplicationException($"The proxyUrl is set to {proxyUrl}. This is not a well formed uri!");
+
+            return proxyUrl;
+        }
+
+        private string GetDownloadFileName(AppConfig configuration)
+        {
+            var downloadFileName = configuration.DownloadFileName;
+            if (string.IsNullOrEmpty(downloadFileName)) downloadFileName = "playlist.m3u";
+
+            return downloadFileName;
         }
     }
 }