Initial Commit
This commit is contained in:
Michael Nolan
@@ -0,0 +1,357 @@
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using System;
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using System.Net;
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using System.Net.Sockets;
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using System.Threading.Tasks;
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using System.IO;
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using System.Threading;
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using System.Text;
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using System.Collections.Generic;
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using System.Linq;
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using HeyRed.Mime;
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using Newtonsoft.Json;
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namespace Tesses.WebServer
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{
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public static class Extensions
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{
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const string BYTES_RANGE_HEADER = "Range";
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private static async Task WriteHeadersAsync(this ServerContext ctx)
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{
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string status_line = $"HTTP/1.1 {ctx.StatusCode} {StatusCodeMap.GetStatusString(ctx.StatusCode)}\r\n";
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StringBuilder b = new StringBuilder(status_line);
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foreach (var hdr in ctx.ResponseHeaders)
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{
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foreach (var v in hdr.Value)
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{
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b.Append($"{hdr.Key}: {v}\r\n");
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}
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}
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b.Append("\r\n");
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var data = Encoding.UTF8.GetBytes(b.ToString());
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await ctx.NetworkStream.WriteAsync(data, 0, data.Length);
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}
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public static async Task SendFileAsync(this ServerContext ctx, string file)
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{
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using (var strm = File.OpenRead(file))
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{
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await ctx.SendStreamAsync( strm, MimeTypesMap.GetMimeType(file));
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}
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}
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public static async Task SendExceptionAsync(this ServerContext ctx, Exception ex)
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{
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string name = ex.GetType().FullName;
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string j = $"<html><head><title>{WebUtility.HtmlEncode(name)} thrown</title></head><body><h1>{WebUtility.HtmlEncode(name)} thrown</h1><h3>Description: {WebUtility.HtmlEncode(ex.Message)}</h3></body></html>";
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ctx.StatusCode = 500;
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await ctx.SendTextAsync(j);
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}
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public static async Task SendJsonAsync(this ServerContext ctx,object value)
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{
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await ctx.SendTextAsync(JsonConvert.SerializeObject(value), "application/json");
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}
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public static async Task SendTextAsync(this ServerContext ctx, string data, string content_type = "text/html")
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{
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await ctx.SendBytesAsync(Encoding.UTF8.GetBytes(data), content_type);
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}
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public static async Task SendBytesAsync(this ServerContext ctx, byte[] array, string content_type = "application/octet-stream")
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{
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using (var ms = new MemoryStream(array))
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{
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await ctx.SendStreamAsync( ms, content_type);
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}
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}
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public static async Task SendStreamAsync(this ServerContext ctx, Stream strm, string content_type = "application/octet-stream")
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{
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//ctx.StatusCode = 200;
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int start = 0, end = (int)strm.Length - 1;
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if (ctx.RequestHeaders.ContainsKey(BYTES_RANGE_HEADER))
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{
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if (ctx.RequestHeaders[BYTES_RANGE_HEADER].Count > 1)
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{
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throw new NotSupportedException("Multiple 'Range' headers are not supported.");
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}
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var range = ctx.RequestHeaders[BYTES_RANGE_HEADER][0].Replace("bytes=", String.Empty)
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.Split(new string[] { "-" }, StringSplitOptions.RemoveEmptyEntries)
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.Select(x => Int32.Parse(x))
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.ToArray();
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start = (range.Length > 0) ? range[0] : 0;
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end = (range.Length > 1) ? range[1] : (int)(strm.Length - 1);
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var hdrs = ctx.ResponseHeaders;
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hdrs.Add("Accept-Ranges", "bytes");
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hdrs.Add("Content-Range", "bytes " + start + "-" + end + "/" + strm.Length);
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ctx.StatusCode = 206;
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}
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ctx.ResponseHeaders.Add("Content-Length", (end - start + 1).ToString());
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ctx.ResponseHeaders.Add("Content-Type", content_type);
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await WriteHeadersAsync(ctx);
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if (!ctx.Method.Equals("HEAD",StringComparison.Ordinal))
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{
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try
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{
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strm.Position = start;
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strm.CopyTo(ctx.NetworkStream, Math.Min(8 * 1024 * 1024, end - start + 1));
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}
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finally
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{
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strm.Close();
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ctx.NetworkStream.Close();
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}
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}
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}
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public static T2 GetFirst<T1,T2>(this Dictionary<T1,List<T2>> args,T1 key)
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{
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return args[key][0];
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}
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public static void Add<T1,T2>(this Dictionary<T1,List<T2>> list,T1 key,T2 item)
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{
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if (list.ContainsKey(key))
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{
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list[key].Add(item);
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}
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else
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{
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List<T2> items = new List<T2>();
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items.Add(item);
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list.Add(key, items);
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}
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}
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public static void AddRange<T1,T2>(this Dictionary<T1,List<T2>> list,T1 key,IEnumerable<T2> items)
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{
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if (list.ContainsKey(key))
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{
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list[key].AddRange(items);
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}
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else
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{
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List<T2> items2 = new List<T2>();
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items2.AddRange(items);
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list.Add(key, items2);
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}
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}
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public static bool EndsWith(this StringBuilder sb, string test,
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StringComparison comparison)
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{
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if (sb.Length < test.Length)
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return false;
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string end = sb.ToString(sb.Length - test.Length, test.Length);
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return end.Equals(test, comparison);
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}
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}
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public class NotFoundServer : Server
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{
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public NotFoundServer(string html)
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{
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_html = html;
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}
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public NotFoundServer()
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{
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_html = "<html><head><title>File {url} not found</title></head><body><h1>404 Not Found</h1><h4>{url}</h4></body></html>";
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}
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string _html;
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public override async Task GetAsync(ServerContext ctx)
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{
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ctx.StatusCode = 404;
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await ctx.SendTextAsync( _html.Replace("{url}", WebUtility.HtmlEncode(ctx.UrlPath)));
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}
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}
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public class StaticServer : Server
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{
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string _path;
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IServer _server;
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public StaticServer(string path)
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{
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_path = path;
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_server = new NotFoundServer();
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_defaultFileNames = new string[] {"index.html","index.htm","default.html","default.htm" };
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}
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string[] _defaultFileNames;
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public StaticServer(string path,string[] defaultFileNames,IServer notfoundserver)
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{
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_path = path;
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_server = notfoundserver;
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_defaultFileNames = defaultFileNames;
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}
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public bool DefaultFileExists(string path,out string name)
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{
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foreach(var def in _defaultFileNames)
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{
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name = Path.Combine(path, def);
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if(File.Exists(name))
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{
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return true;
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}
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}
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name = "";
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return false;
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}
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public override async Task GetAsync(ServerContext ctx)
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{
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string someUrl = Path.Combine(_path,WebUtility.UrlDecode(ctx.UrlPath.Substring(1)).Replace('/', Path.DirectorySeparatorChar));
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Console.WriteLine(someUrl);
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if (Directory.Exists(someUrl))
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{
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string name;
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if(DefaultFileExists(someUrl,out name))
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{
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await ctx.SendFileAsync(name);
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}
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}
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else if (File.Exists(someUrl))
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{
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await ctx.SendFileAsync(someUrl);
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}
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else
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{
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await _server.GetAsync(ctx);
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}
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}
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}
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public abstract class Server : IServer
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{
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public abstract Task GetAsync(ServerContext ctx);
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public virtual async Task PostAsync(ServerContext ctx)
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{
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ctx.StatusCode = (int)HttpStatusCode.MethodNotAllowed;
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await ctx.SendTextAsync("Method Not Supported");
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}
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}
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public interface IServer
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{
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Task GetAsync(ServerContext ctx);
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Task PostAsync(ServerContext ctx);
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}
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public sealed class HttpServerListener
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{
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IServer _server;
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TcpListener _listener;
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public HttpServerListener(IPEndPoint endPoint,IServer server)
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{
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_listener = new TcpListener(endPoint);
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_server = server;
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}
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public async Task ListenAsync(CancellationToken token)
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{
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_listener.Start();
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using (var r = token.Register(() => _listener.Stop())) {
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while (!token.IsCancellationRequested)
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{
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var socket=await _listener.AcceptTcpClientAsync();
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await CommunicateHostAsync(socket);
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}
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}
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}
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private string ReadHeaders(NetworkStream strm)
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{
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StringBuilder s = new StringBuilder();
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var decoder = Encoding.UTF8.GetDecoder();
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var nextChar = new char[1];
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while (!s.EndsWith("\r\n\r\n",StringComparison.Ordinal))
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{
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int data = strm.ReadByte();
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if(data == -1)
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{
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break;
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}
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int charCount=decoder.GetChars(new byte[] { (byte)data }, 0, 1, nextChar, 0);
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if (charCount == 0) continue;
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s.Append(nextChar);
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}
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return s.ToString();
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}
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private Dictionary<string,List<string>> Headers(string s,out string req_line)
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{
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Dictionary<string, List<string>> items = new Dictionary<string, List<string>>();
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string[] lines = s.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
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req_line = lines[0];
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for(int i=1;i<lines.Length;i++)
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{
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var line_split=lines[i].Split(new[] { ": " },2,StringSplitOptions.None);
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if (line_split.Length == 2)
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{
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items.Add(line_split[0], line_split[1]);
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}
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}
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return items;
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}
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private async Task CommunicateHostAsync(TcpClient clt)
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{
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//<METHOD> <PATH> HTTP/1.1\r\n
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//HEADER1\r\n
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//HEADER2\r\n
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//......
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//HEADERN\r\n
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//\r\n
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//OPTIONAL REQUEST BODY
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//RESPONSE
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using (NetworkStream strm = clt.GetStream())
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{
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string request_line = "";
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string res=ReadHeaders(strm);
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var headers=Headers(res,out request_line);
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// {Method} {Path} HTTP/1.1
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ServerContext ctx=null;
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string[] request=request_line.Split(new char[] { ' ' }, 3);
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string method = request[0];
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try
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{
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switch (method)
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{
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case "HEAD":
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case "GET":
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string path = request[1];
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string ver = request[2];
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ctx = new ServerContext(method,strm, path, headers);
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await _server.GetAsync(ctx);
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break;
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case "POST":
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break;
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}
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}catch(Exception ex)
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{
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try
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{
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await ctx.SendExceptionAsync(ex);
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}catch(Exception ex2)
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{
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_ = ex2;
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}
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}
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}
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}
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//protected abstract Task<IResult> Get(string url,Dictionary<string,string> headers);
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//protected abstract Task GetAsync(ServerContext ctx);
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}
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}
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