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NegotiateProtocol.cs
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NegotiateProtocol.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Buffers;
using System.Collections.Generic;
using System.IO;
using Microsoft.AspNetCore.Internal;
using Newtonsoft.Json;
namespace Microsoft.AspNetCore.Http.Connections
{
public static class NegotiateProtocol
{
private const string ConnectionIdPropertyName = "connectionId";
private const string UrlPropertyName = "url";
private const string AccessTokenPropertyName = "accessToken";
private const string AvailableTransportsPropertyName = "availableTransports";
private const string TransportPropertyName = "transport";
private const string TransferFormatsPropertyName = "transferFormats";
public static void WriteResponse(NegotiationResponse response, IBufferWriter<byte> output)
{
var textWriter = Utf8BufferTextWriter.Get(output);
try
{
using (var jsonWriter = JsonUtils.CreateJsonTextWriter(textWriter))
{
jsonWriter.WriteStartObject();
if (!string.IsNullOrEmpty(response.Url))
{
jsonWriter.WritePropertyName(UrlPropertyName);
jsonWriter.WriteValue(response.Url);
}
if (!string.IsNullOrEmpty(response.AccessToken))
{
jsonWriter.WritePropertyName(AccessTokenPropertyName);
jsonWriter.WriteValue(response.AccessToken);
}
if (!string.IsNullOrEmpty(response.ConnectionId))
{
jsonWriter.WritePropertyName(ConnectionIdPropertyName);
jsonWriter.WriteValue(response.ConnectionId);
}
jsonWriter.WritePropertyName(AvailableTransportsPropertyName);
jsonWriter.WriteStartArray();
foreach (var availableTransport in response.AvailableTransports)
{
jsonWriter.WriteStartObject();
jsonWriter.WritePropertyName(TransportPropertyName);
jsonWriter.WriteValue(availableTransport.Transport);
jsonWriter.WritePropertyName(TransferFormatsPropertyName);
jsonWriter.WriteStartArray();
foreach (var transferFormat in availableTransport.TransferFormats)
{
jsonWriter.WriteValue(transferFormat);
}
jsonWriter.WriteEndArray();
jsonWriter.WriteEndObject();
}
jsonWriter.WriteEndArray();
jsonWriter.WriteEndObject();
jsonWriter.Flush();
}
}
finally
{
Utf8BufferTextWriter.Return(textWriter);
}
}
public static NegotiationResponse ParseResponse(Stream content)
{
try
{
using (var reader = JsonUtils.CreateJsonTextReader(new StreamReader(content)))
{
JsonUtils.CheckRead(reader);
JsonUtils.EnsureObjectStart(reader);
string connectionId = null;
string url = null;
string accessToken = null;
List<AvailableTransport> availableTransports = null;
var completed = false;
while (!completed && JsonUtils.CheckRead(reader))
{
switch (reader.TokenType)
{
case JsonToken.PropertyName:
var memberName = reader.Value.ToString();
switch (memberName)
{
case UrlPropertyName:
url = JsonUtils.ReadAsString(reader, UrlPropertyName);
break;
case AccessTokenPropertyName:
accessToken = JsonUtils.ReadAsString(reader, AccessTokenPropertyName);
break;
case ConnectionIdPropertyName:
connectionId = JsonUtils.ReadAsString(reader, ConnectionIdPropertyName);
break;
case AvailableTransportsPropertyName:
JsonUtils.CheckRead(reader);
JsonUtils.EnsureArrayStart(reader);
availableTransports = new List<AvailableTransport>();
while (JsonUtils.CheckRead(reader))
{
if (reader.TokenType == JsonToken.StartObject)
{
availableTransports.Add(ParseAvailableTransport(reader));
}
else if (reader.TokenType == JsonToken.EndArray)
{
break;
}
}
break;
default:
reader.Skip();
break;
}
break;
case JsonToken.EndObject:
completed = true;
break;
default:
throw new InvalidDataException($"Unexpected token '{reader.TokenType}' when reading negotiation response JSON.");
}
}
if (url == null)
{
// if url isn't specified, connectionId and available transports are required
if (connectionId == null)
{
throw new InvalidDataException($"Missing required property '{ConnectionIdPropertyName}'.");
}
if (availableTransports == null)
{
throw new InvalidDataException($"Missing required property '{AvailableTransportsPropertyName}'.");
}
}
return new NegotiationResponse
{
ConnectionId = connectionId,
Url = url,
AccessToken = accessToken,
AvailableTransports = availableTransports
};
}
}
catch (Exception ex)
{
throw new InvalidDataException("Invalid negotiation response received.", ex);
}
}
private static AvailableTransport ParseAvailableTransport(JsonTextReader reader)
{
var availableTransport = new AvailableTransport();
while (JsonUtils.CheckRead(reader))
{
switch (reader.TokenType)
{
case JsonToken.PropertyName:
var memberName = reader.Value.ToString();
switch (memberName)
{
case TransportPropertyName:
availableTransport.Transport = JsonUtils.ReadAsString(reader, TransportPropertyName);
break;
case TransferFormatsPropertyName:
JsonUtils.CheckRead(reader);
JsonUtils.EnsureArrayStart(reader);
var completed = false;
availableTransport.TransferFormats = new List<string>();
while (!completed && JsonUtils.CheckRead(reader))
{
switch (reader.TokenType)
{
case JsonToken.String:
availableTransport.TransferFormats.Add(reader.Value.ToString());
break;
case JsonToken.EndArray:
completed = true;
break;
default:
throw new InvalidDataException($"Unexpected token '{reader.TokenType}' when reading transfer formats JSON.");
}
}
break;
default:
reader.Skip();
break;
}
break;
case JsonToken.EndObject:
if (availableTransport.Transport == null)
{
throw new InvalidDataException($"Missing required property '{TransportPropertyName}'.");
}
if (availableTransport.TransferFormats == null)
{
throw new InvalidDataException($"Missing required property '{TransferFormatsPropertyName}'.");
}
return availableTransport;
default:
throw new InvalidDataException($"Unexpected token '{reader.TokenType}' when reading available transport JSON.");
}
}
throw new InvalidDataException("Unexpected end when reading JSON.");
}
}
}