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Http11IProtocolHandler.cs
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Http11IProtocolHandler.cs
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using Microsoft.Extensions.Logging;
using MiniWebServer.Abstractions;
using MiniWebServer.Server.Abstractions;
using MiniWebServer.Server.Abstractions.Http;
using MiniWebServer.Server.Abstractions.Parsers;
using MiniWebServer.Server.Abstractions.Parsers.Http11;
using System.Buffers;
using System.IO.Pipelines;
using System.Text;
using HttpMethod = MiniWebServer.Abstractions.Http.HttpMethod;
namespace MiniWebServer.Server.ProtocolHandlers.Http11
{
public class Http11IProtocolHandler : IProtocolHandler // should we use PipeLines to make the code simpler?
{
public const string HttpVersionString = "HTTP/1.1";
public const int HttpMaxHeaderLineLength = 8 * 1024; // max 8KB each line
protected readonly ProtocolHandlerConfiguration config;
protected readonly ILoggerFactory loggerFactory;
protected readonly IHttpComponentParser httpComponentParser;
private readonly ICookieValueParser cookieValueParser;
protected readonly IHeaderValidator[] headerValidators;
private readonly ILogger<Http11IProtocolHandler> logger;
public Http11IProtocolHandler(ProtocolHandlerConfiguration config, ILoggerFactory loggerFactory, IHttpComponentParser httpComponentParser, ICookieValueParser cookieValueParser)
{
this.config = config ?? throw new ArgumentNullException(nameof(config));
this.loggerFactory = loggerFactory ?? throw new ArgumentNullException(nameof(loggerFactory));
this.httpComponentParser = httpComponentParser ?? throw new ArgumentNullException(nameof(httpComponentParser));
this.cookieValueParser = cookieValueParser ?? throw new ArgumentNullException(nameof(cookieValueParser));
logger = loggerFactory.CreateLogger<Http11IProtocolHandler>();
headerValidators = [
new Http11StandardHeaderValidators.ContentLengthHeaderValidator(config.MaxRequestBodySize, loggerFactory),
new Http11StandardHeaderValidators.TransferEncodingHeaderValidator(loggerFactory),
];
}
public int ProtocolVersion => 101;
public async Task<bool> ReadRequestAsync(PipeReader reader, IHttpRequestBuilder requestBuilder, CancellationToken cancellationToken)
{
long contentLength = 0;
string contentType = string.Empty;
try
{
ReadResult readResult = await reader.ReadAsync(cancellationToken);
ReadOnlySequence<byte> buffer = readResult.Buffer;
requestBuilder.SetBodyPipeline(new Pipe());
var httpMethod = HttpMethod.Get;
// read request line
if (TryReadLine(ref buffer, out ReadOnlySequence<byte> line))
{
var requestLine = httpComponentParser.ParseRequestLine(line);
if (requestLine != null)
{
logger.LogDebug("Parsed request line: {requestLine}", requestLine);
// when implementing as a sequence of octets, if method length exceeds method buffer length, you should return 501 Not Implemented
// if Url length exceeds Url buffer length, you should return 414 URI Too Long
// todo: parse the Url with percent-encoding (https://www.rfc-editor.org/rfc/rfc3986)
httpMethod = requestLine.Method;
requestBuilder
.SetMethod(requestLine.Method)
.SetUrl(requestLine.Url)
.SetParameters(requestLine.Parameters)
.SetQueryString(requestLine.QueryString)
.SetHash(requestLine.Hash)
.SetSegments(requestLine.Segments);
}
else
{
logger.LogError("Invalid request line");
return false;
}
reader.AdvanceTo(buffer.Start); // after a successful TryReadLine, buffer.Start advanced to the byte after '\n'
}
else
{
// we could not read header line
return false;
}
// now we read headers
while (TryReadLine(ref buffer, out line))
{
if (line.Length > HttpMaxHeaderLineLength)
{
logger.LogError("Header line too long");
return false;
}
var sb = new StringBuilder();
sb.Append(Encoding.ASCII.GetString(line).Replace("\r", ""));
if (sb.Length == 0) // found an empty line
{
if (!ValidateRequestHeader(httpMethod, contentLength, contentType))
{
return false; // reject request for whatever reason
}
reader.AdvanceTo(buffer.Start);
break;
}
else
{
var headerLineText = sb.ToString();
var headerLine = httpComponentParser.ParseHeaderLine(line);
logger.LogDebug("Found header: {headerLine}", headerLine);
if (headerLine != null)
{
if (!IsValidHeader(headerLine.Name, headerLine.Value))
{
logger.LogError("Header line rejected: {line}", headerLineText);
return false;
}
requestBuilder.AddHeader(headerLine.Name, headerLine.Value);
// here we have some checks for important headers
if ("Host".Equals(headerLine.Name, StringComparison.OrdinalIgnoreCase))
{
var host = headerLine.Value;
int idx = host.IndexOf(':');
if (idx != -1)
{
host = host[..idx];
}
requestBuilder.SetHost(host);
}
else if ("Content-Length".Equals(headerLine.Name, StringComparison.OrdinalIgnoreCase))
{
if (long.TryParse(headerLine.Value, out long length) && length >= 0)
{
contentLength = length;
requestBuilder.SetContentLength(length);
}
else
{
return false;
}
}
else if ("Content-Type".Equals(headerLine.Name, StringComparison.OrdinalIgnoreCase))
{
contentType = headerLine.Value;
requestBuilder.SetContentType(contentType);
}
else if ("Cookie".Equals(headerLine.Name, StringComparison.OrdinalIgnoreCase))
{
var cookies = cookieValueParser.ParseCookieHeader(headerLine.Value);
if (cookies == null)
{
logger.LogError("Error parsing cookie value: {cookie}", headerLine.Value);
return false;
}
else
{
requestBuilder.AddCookie(cookies);
}
}
}
else
{
logger.LogError("Invalid header line: {line}", headerLineText);
return false;
}
reader.AdvanceTo(buffer.Start);
}
}
return true;
}
catch (OperationCanceledException)
{
logger.LogInformation("Connection expired");
return false;
}
catch (Exception ex)
{
logger.LogError(ex, "Error reading request");
return false;
}
}
public async Task ReadBodyAsync(PipeReader reader, IHttpRequest request, CancellationToken cancellationToken)
{
// we don't read body part in ReadRequestAsync, because:
// 1. a body can be very large, and we want to read/process it only when an app requests
// 2. we want to make it responsive, we can discard a connection right away without reading it's body, there is no reasons to waste our resouces to process an invalid request
// read body part, we read only contentLength bytes
var contentLength = request.ContentLength;
if (contentLength == 0)
{
// nothing to read
await request.BodyPipeline.Writer.CompleteAsync();
return;
}
if (contentLength < 0)
{
throw new InvalidOperationException("Content-Length < 0");
}
logger.LogDebug("Start reading body, contentLength = {contentLength}", contentLength);
ReadResult readResult = await reader.ReadAsync(cancellationToken);
ReadOnlySequence<byte> buffer = readResult.Buffer;
long bytesRead = 0;
while (bytesRead < contentLength)
{
logger.LogDebug("Reading body, bytesRead = {bytesRead}", bytesRead);
long maxBytesToRead = contentLength - bytesRead;
if (buffer.Length >= maxBytesToRead)
{
var writingPart = buffer.Slice(0, maxBytesToRead);
await request.BodyPipeline.Writer.WriteAsync(writingPart.ToArray(), cancellationToken); // todo: use a better way than 'ToArray'
reader.AdvanceTo(buffer.GetPosition(maxBytesToRead));
//logger.LogDebug("Read {b} bytes from body, total {t}", buffer.Length, bytesRead);
break;
}
else if (buffer.Length > 0)
{
await request.BodyPipeline.Writer.WriteAsync(buffer.ToArray(), cancellationToken); // todo: use a better way than 'ToArray'
reader.AdvanceTo(buffer.GetPosition(buffer.Length));
bytesRead += buffer.Length;
//logger.LogDebug("Read {b} bytes from body, total {t}", buffer.Length, bytesRead);
}
readResult = await reader.ReadAsync(cancellationToken);
buffer = readResult.Buffer;
}
logger.LogDebug("Done reading body, bytesRead = {bytesRead}", bytesRead);
await request.BodyPipeline.Writer.FlushAsync(cancellationToken);
await request.BodyPipeline.Writer.CompleteAsync();
}
private static bool TryReadLine(ref ReadOnlySequence<byte> buffer, out ReadOnlySequence<byte> line)
{
SequencePosition? pos = buffer.PositionOf((byte)'\n');
if (pos != null)
{
line = buffer.Slice(0, pos.Value);
buffer = buffer.Slice(buffer.GetPosition(1, pos.Value));
return true;
}
else
{
line = default;
return false;
}
}
private bool ValidateRequestHeader(HttpMethod httpMethod, long contentLength, string contentType)
{
if ((httpMethod == HttpMethod.Post || httpMethod == HttpMethod.Put))
{
if (string.IsNullOrEmpty(contentType))
{
logger.LogError("Content-Type cannot be empty");
return false;
}
}
return true;
}
protected bool IsValidHeader(string name, string value)
{
foreach (var validator in headerValidators)
{
if (validator.Validate(name, value) == false)
{
return false;
}
}
return true;
}
private static void Write(Stream stream, string s)
{
var bytes = Encoding.ASCII.GetBytes(s);
stream.Write(bytes.AsSpan());
}
//public async Task<bool> WriteResponseAsync(PipeWriter writer, IHttpResponse response, CancellationToken cancellationToken)
//{
// Write(writer, $"{HttpVersionString} {((int)response.StatusCode)} {response.ReasonPhrase}\r\n");
// foreach (var header in response.Content.Headers)
// response.Headers.AddOrUpdate(header.Key, header.Value);
// foreach (var header in response.Headers)
// {
// Write(writer, $"{header.Key}: {string.Join(',', header.Value)}\r\n");
// }
// foreach (var cookie in response.Cookies)
// {
// Write(writer, $"Set-Cookie: {cookie.Key}={string.Join("; ", cookie.Value.Value)}\r\n");
// }
// Write(writer, "\r\n");
// var contentWriter = new ByteBufferContentWriter(writer);
// await response.Content.WriteToAsync(contentWriter, cancellationToken); // todo: what if we have an error while sending response content?
// return true;
//}
public async Task<bool> WriteResponseAsync(IHttpResponse response, CancellationToken cancellationToken)
{
var stream = response.Stream ?? throw new InvalidOperationException("response.Body should not be null");
Write(stream, $"{HttpVersionString} {((int)response.StatusCode)} {response.ReasonPhrase}\r\n");
foreach (var header in response.Content.Headers)
response.Headers.AddOrUpdate(header.Key, header.Value);
foreach (var header in response.Headers)
{
Write(stream, $"{header.Key}: {string.Join(',', header.Value)}\r\n");
}
foreach (var cookie in response.Cookies)
{
Write(stream, $"Set-Cookie: {cookie.Key}={string.Join("; ", cookie.Value.Value)}\r\n");
}
Write(stream, "\r\n");
await response.Content.WriteToAsync(stream, cancellationToken); // todo: what if we have an error while sending response content?
await stream.FlushAsync(cancellationToken);
return true;
}
public void Reset()
{
}
}
}