mirror of
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768 lines
33 KiB
C#
768 lines
33 KiB
C#
/*
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* Copyright (c) Citrix Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1) Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Net;
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using System.Net.Sockets;
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using System.Text;
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using System.Net.Security;
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using System.Security.Authentication;
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using System.Security.Cryptography;
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using System.Security.Cryptography.X509Certificates;
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using System.Runtime.Serialization;
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namespace XenAPI
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{
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public partial class HTTP
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{
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[Serializable]
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public class TooManyRedirectsException : Exception
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{
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private readonly int redirect;
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private readonly Uri uri;
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public TooManyRedirectsException(int redirect, Uri uri)
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{
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this.redirect = redirect;
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this.uri = uri;
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}
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public TooManyRedirectsException() : base() { }
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public TooManyRedirectsException(string message) : base(message) { }
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public TooManyRedirectsException(string message, Exception exception) : base(message, exception) { }
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protected TooManyRedirectsException(SerializationInfo info, StreamingContext context)
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: base(info, context)
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{
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redirect = info.GetInt32("redirect");
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uri = (Uri)info.GetValue("uri", typeof(Uri));
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}
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public override void GetObjectData(SerializationInfo info, StreamingContext context)
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{
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if (info == null)
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{
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throw new ArgumentNullException("info");
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}
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info.AddValue("redirect", redirect);
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info.AddValue("uri", uri, typeof(Uri));
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base.GetObjectData(info, context);
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}
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}
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[Serializable]
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public class BadServerResponseException : Exception
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{
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public BadServerResponseException() : base() { }
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public BadServerResponseException(string message) : base(message) { }
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public BadServerResponseException(string message, Exception exception) : base(message, exception) { }
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protected BadServerResponseException(SerializationInfo info, StreamingContext context) : base(info, context) { }
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}
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[Serializable]
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public class CancelledException : Exception
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{
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public CancelledException() : base() { }
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public CancelledException(string message) : base(message) { }
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public CancelledException(string message, Exception exception) : base(message, exception) { }
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protected CancelledException(SerializationInfo info, StreamingContext context) : base(info, context) { }
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}
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[Serializable]
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public class ProxyServerAuthenticationException : Exception
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{
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public ProxyServerAuthenticationException() : base() { }
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public ProxyServerAuthenticationException(string message) : base(message) { }
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public ProxyServerAuthenticationException(string message, Exception exception) : base(message, exception) { }
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protected ProxyServerAuthenticationException(SerializationInfo info, StreamingContext context) : base(info, context) { }
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}
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public delegate bool FuncBool();
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public delegate void UpdateProgressDelegate(int percent);
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public delegate void DataCopiedDelegate(long bytes);
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// Size of byte buffer used for GETs and PUTs
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// (not the socket rx buffer)
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public const int BUFFER_SIZE = 32 * 1024;
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public const int MAX_REDIRECTS = 10;
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public const int DEFAULT_HTTPS_PORT = 443;
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public enum ProxyAuthenticationMethod
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{
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Basic = 0,
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Digest = 1
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}
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/// <summary>
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/// The authentication scheme to use for authenticating to a proxy server.
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/// Defaults to Digest.
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/// </summary>
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public static ProxyAuthenticationMethod CurrentProxyAuthenticationMethod = ProxyAuthenticationMethod.Digest;
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#region Helper functions
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private static void WriteLine(String txt, Stream stream)
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{
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byte[] bytes = System.Text.Encoding.ASCII.GetBytes(String.Format("{0}\r\n", txt));
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stream.Write(bytes, 0, bytes.Length);
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}
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private static void WriteLine(Stream stream)
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{
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WriteLine("", stream);
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}
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// Stream.ReadByte() is used because using StreamReader in its place causes the reading to become stuck,
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// as it seems the Stream object has trouble recognizing the end of the stream. This seems to be a common
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// problem, of which a common solution is to read each byte until an EndOfStreamException is thrown, as is
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// done here.
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private static string ReadLine(Stream stream)
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{
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System.Text.StringBuilder result = new StringBuilder();
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while (true)
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{
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int b = stream.ReadByte();
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if (b == -1)
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throw new EndOfStreamException();
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char c = Convert.ToChar(b);
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result.Append(c);
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if (c == '\n')
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return result.ToString();
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}
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}
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/// <summary>
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/// Read HTTP headers, doing any redirects as necessary
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/// </summary>
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/// <returns>True if a redirect has occurred - headers will need to be resent.</returns>
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private static bool ReadHttpHeaders(ref Stream stream, IWebProxy proxy, bool nodelay, int timeout_ms, List<string> headers = null)
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{
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// read headers/fields
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string line = ReadLine(stream), initialLine = line, transferEncodingField = null;
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if (string.IsNullOrEmpty(initialLine)) // sanity check
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return false;
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if (headers == null)
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headers = new List<string>();
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while (!string.IsNullOrWhiteSpace(line)) // IsNullOrWhiteSpace also checks for empty string
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{
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line = line.TrimEnd('\r', '\n');
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headers.Add(line);
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if (line == "Transfer-Encoding: Chunked")
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transferEncodingField = line;
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line = ReadLine(stream);
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}
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// read chunks
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string entityBody = "";
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if (!string.IsNullOrEmpty(transferEncodingField))
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{
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int lastChunkSize = -1;
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do
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{
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// read chunk size
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string chunkSizeStr = ReadLine(stream);
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chunkSizeStr = chunkSizeStr.TrimEnd('\r', '\n');
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int chunkSize = 0;
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int.TryParse(chunkSizeStr, System.Globalization.NumberStyles.HexNumber,
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System.Globalization.CultureInfo.InvariantCulture, out chunkSize);
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// read <chunkSize> number of bytes from the stream
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int totalNumberOfBytesRead = 0;
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int numberOfBytesRead;
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byte[] bytes = new byte[chunkSize];
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do
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{
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numberOfBytesRead = stream.Read(bytes, totalNumberOfBytesRead, chunkSize - totalNumberOfBytesRead);
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totalNumberOfBytesRead += numberOfBytesRead;
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} while (numberOfBytesRead > 0 && totalNumberOfBytesRead < chunkSize);
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string str = System.Text.Encoding.ASCII.GetString(bytes);
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string[] split = str.Split(new string[] {"\r\n"}, StringSplitOptions.RemoveEmptyEntries);
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headers.AddRange(split);
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entityBody += str;
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line = ReadLine(stream); // empty line in the end of chunk
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lastChunkSize = chunkSize;
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} while (lastChunkSize != 0);
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entityBody = entityBody.TrimEnd('\r', '\n');
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headers.Add(entityBody); // keep entityBody if it's needed for Digest authentication (when qop="auth-int")
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}
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else
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{
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// todo: handle other transfer types, in case "Transfer-Encoding: Chunked" isn't used
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}
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// handle server response
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int code = getResultCode(initialLine);
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switch (code)
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{
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case 407: // authentication error; caller must handle this case
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case 200:
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break;
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case 302:
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string url = "";
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foreach (string header in headers)
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{
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if (header.StartsWith("Location: "))
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{
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url = header.Substring(10);
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break;
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}
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}
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Uri redirect = new Uri(url.Trim());
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stream.Close();
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stream = ConnectStream(redirect, proxy, nodelay, timeout_ms);
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return true; // headers need to be sent again
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default:
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stream.Close();
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throw new BadServerResponseException(string.Format("Received error code {0} from the server", initialLine));
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}
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return false;
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}
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private static int getResultCode(string line)
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{
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string[] bits = line.Split(new char[] { ' ' });
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return (bits.Length < 2 ? 0 : Int32.Parse(bits[1]));
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}
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public static bool UseSSL(Uri uri)
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{
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return uri.Scheme == "https" || uri.Port == DEFAULT_HTTPS_PORT;
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}
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private static bool ValidateServerCertificate(
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object sender,
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X509Certificate certificate,
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X509Chain chain,
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SslPolicyErrors sslPolicyErrors)
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{
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return true;
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}
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/// <summary>
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/// Returns a secure MD5 hash of the given input string.
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/// </summary>
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/// <param name="str">The string to hash.</param>
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/// <returns>The secure hash as a hex string.</returns>
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public static string MD5Hash(string str)
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{
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MD5 hasher = MD5.Create();
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ASCIIEncoding enc = new ASCIIEncoding();
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byte[] bytes = enc.GetBytes(str);
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byte[] hash = hasher.ComputeHash(bytes);
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return BitConverter.ToString(hash).Replace("-", "").ToLower();
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}
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public static long CopyStream(Stream inStream, Stream outStream,
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DataCopiedDelegate progressDelegate, FuncBool cancellingDelegate)
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{
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long bytesWritten = 0;
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byte[] buffer = new byte[BUFFER_SIZE];
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DateTime lastUpdate = DateTime.Now;
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while (cancellingDelegate == null || !cancellingDelegate())
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{
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int bytesRead = inStream.Read(buffer, 0, buffer.Length);
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if (bytesRead == 0)
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break;
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outStream.Write(buffer, 0, bytesRead);
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bytesWritten += bytesRead;
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if (progressDelegate != null &&
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DateTime.Now - lastUpdate > TimeSpan.FromMilliseconds(500))
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{
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progressDelegate(bytesWritten);
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lastUpdate = DateTime.Now;
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}
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}
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if (cancellingDelegate != null && cancellingDelegate())
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throw new CancelledException();
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if (progressDelegate != null)
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progressDelegate(bytesWritten);
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return bytesWritten;
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}
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/// <summary>
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/// Build a URI from a hostname, a path, and some query arguments
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/// </summary>
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/// <param name="args">An even-length array, alternating argument names and values</param>
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/// <param name="hostname"></param>
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/// <param name="path"></param>
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public static Uri BuildUri(string hostname, string path, params object[] args)
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{
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// The last argument may be an object[] in its own right, in which case we need
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// to flatten the array.
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List<object> flatargs = new List<object>();
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foreach (object arg in args)
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{
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if (arg is IEnumerable<object>)
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flatargs.AddRange((IEnumerable<object>)arg);
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else
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flatargs.Add(arg);
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}
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UriBuilder uri = new UriBuilder();
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uri.Scheme = "https";
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uri.Port = DEFAULT_HTTPS_PORT;
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uri.Host = hostname;
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uri.Path = path;
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StringBuilder query = new StringBuilder();
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for (int i = 0; i < flatargs.Count - 1; i += 2)
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{
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string kv;
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// If the argument is null, don't include it in the URL
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if (flatargs[i + 1] == null)
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continue;
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// bools are special because some xapi calls use presence/absence and some
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// use "b=true" (not "True") and "b=false". But all accept "b=true" or absent.
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if (flatargs[i + 1] is bool)
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{
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if (!((bool)flatargs[i + 1]))
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continue;
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kv = flatargs[i] + "=true";
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}
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else
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kv = flatargs[i] + "=" + Uri.EscapeDataString(flatargs[i + 1].ToString());
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if (query.Length != 0)
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query.Append('&');
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query.Append(kv);
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}
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uri.Query = query.ToString();
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return uri.Uri;
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}
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private static string GetPartOrNull(string str, int partIndex)
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{
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string[] parts = str.Split(new char[] { ' ' }, partIndex + 2, StringSplitOptions.RemoveEmptyEntries);
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return partIndex < parts.Length - 1 ? parts[partIndex] : null;
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}
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#endregion
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private static NetworkStream ConnectSocket(Uri uri, bool nodelay, int timeout_ms)
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{
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AddressFamily addressFamily = uri.HostNameType == UriHostNameType.IPv6
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? AddressFamily.InterNetworkV6
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: AddressFamily.InterNetwork;
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Socket socket =
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new Socket(addressFamily, SocketType.Stream, ProtocolType.Tcp);
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socket.NoDelay = nodelay;
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//socket.ReceiveBufferSize = 64 * 1024;
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socket.ReceiveTimeout = timeout_ms;
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socket.SendTimeout = timeout_ms;
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socket.Connect(uri.Host, uri.Port);
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return new NetworkStream(socket, true);
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}
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/// <summary>
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/// This function will connect a stream to a uri (host and port),
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/// negotiating proxies and SSL
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/// </summary>
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/// <param name="uri"></param>
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/// <param name="proxy"></param>
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/// <param name="nodelay"></param>
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/// <param name="timeout_ms">Timeout, in ms. 0 for no timeout.</param>
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public static Stream ConnectStream(Uri uri, IWebProxy proxy, bool nodelay, int timeout_ms)
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{
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IMockWebProxy mockProxy = proxy != null ? proxy as IMockWebProxy : null;
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if (mockProxy != null)
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return mockProxy.GetStream(uri);
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Stream stream;
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bool useProxy = proxy != null && !proxy.IsBypassed(uri);
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if (useProxy)
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{
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Uri proxyURI = proxy.GetProxy(uri);
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stream = ConnectSocket(proxyURI, nodelay, timeout_ms);
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}
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else
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{
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stream = ConnectSocket(uri, nodelay, timeout_ms);
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}
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try
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{
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if (useProxy)
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{
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string line = String.Format("CONNECT {0}:{1} HTTP/1.0", uri.Host, uri.Port);
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WriteLine(line, stream);
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WriteLine(stream);
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List<string> initialResponse = new List<string>();
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ReadHttpHeaders(ref stream, proxy, nodelay, timeout_ms, initialResponse);
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AuthenticateProxy(ref stream, uri, proxy, nodelay, timeout_ms, initialResponse, line);
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}
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if (UseSSL(uri))
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{
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SslStream sslStream = new SslStream(stream, false,
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new RemoteCertificateValidationCallback(ValidateServerCertificate), null);
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sslStream.AuthenticateAsClient("", null, SslProtocols.Tls | SslProtocols.Tls11 | SslProtocols.Tls12, true);
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stream = sslStream;
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}
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return stream;
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}
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catch
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{
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stream.Close();
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throw;
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}
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}
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private static void AuthenticateProxy(ref Stream stream, Uri uri, IWebProxy proxy, bool nodelay, int timeout_ms, List<string> initialResponse, string header)
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{
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// perform authentication only if proxy requires it
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List<string> fields = initialResponse.FindAll(str => str.StartsWith("Proxy-Authenticate:"));
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if (fields.Count > 0)
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{
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// clean up (if initial server response specifies "Proxy-Connection: Close" then stream cannot be re-used)
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string field = initialResponse.Find(str => str.StartsWith("Proxy-Connection: Close", StringComparison.CurrentCultureIgnoreCase));
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if (!string.IsNullOrEmpty(field))
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{
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stream.Close();
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Uri proxyURI = proxy.GetProxy(uri);
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stream = ConnectSocket(proxyURI, nodelay, timeout_ms);
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}
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if (proxy.Credentials == null)
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throw new BadServerResponseException(string.Format("Received error code {0} from the server", initialResponse[0]));
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NetworkCredential credentials = proxy.Credentials.GetCredential(uri, null);
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string basicField = fields.Find(str => str.StartsWith("Proxy-Authenticate: Basic"));
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string digestField = fields.Find(str => str.StartsWith("Proxy-Authenticate: Digest"));
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if (CurrentProxyAuthenticationMethod == ProxyAuthenticationMethod.Basic)
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{
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if (string.IsNullOrEmpty(basicField))
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throw new ProxyServerAuthenticationException("Basic authentication scheme is not supported/enabled by the proxy server.");
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string authenticationFieldReply = string.Format("Proxy-Authorization: Basic {0}",
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Convert.ToBase64String(Encoding.UTF8.GetBytes(credentials.UserName + ":" + credentials.Password)));
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WriteLine(header, stream);
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WriteLine(authenticationFieldReply, stream);
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WriteLine(stream);
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}
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else if (CurrentProxyAuthenticationMethod == ProxyAuthenticationMethod.Digest)
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{
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if (string.IsNullOrEmpty(digestField))
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throw new ProxyServerAuthenticationException("Digest authentication scheme is not supported/enabled by the proxy server.");
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string authenticationFieldReply = string.Format(
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"Proxy-Authorization: Digest username=\"{0}\", uri=\"{1}:{2}\"",
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credentials.UserName, uri.Host, uri.Port);
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string directiveString = digestField.Substring(27, digestField.Length - 27);
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string[] directives = directiveString.Split(new string[] { ", ", "\"" }, StringSplitOptions.RemoveEmptyEntries);
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string algorithm = null; // optional
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string opaque = null; // optional
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string qop = null; // optional
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string realm = null;
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string nonce = null;
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for (int i = 0; i < directives.Length; ++i)
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{
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switch (directives[i])
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{
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case "stale=":
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if (directives[++i].ToLower() == "true")
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throw new ProxyServerAuthenticationException("Stale nonce in Digest authentication attempt.");
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break;
|
|
case "realm=":
|
|
authenticationFieldReply += string.Format(", {0}\"{1}\"", directives[i], directives[++i]);
|
|
realm = directives[i];
|
|
break;
|
|
case "nonce=":
|
|
authenticationFieldReply += string.Format(", {0}\"{1}\"", directives[i], directives[++i]);
|
|
nonce = directives[i];
|
|
break;
|
|
case "opaque=":
|
|
authenticationFieldReply += string.Format(", {0}\"{1}\"", directives[i], directives[++i]);
|
|
opaque = directives[i];
|
|
break;
|
|
case "algorithm=":
|
|
authenticationFieldReply += string.Format(", {0}\"{1}\"", directives[i], directives[++i]);
|
|
algorithm = directives[i];
|
|
break;
|
|
case "qop=":
|
|
List<string> qops = new List<string>(directives[++i].Split(new char[] { ',' }));
|
|
if (qops.Count > 0)
|
|
{
|
|
if (qops.Contains("auth"))
|
|
qop = "auth";
|
|
else if (qops.Contains("auth-int"))
|
|
qop = "auth-int";
|
|
else
|
|
throw new ProxyServerAuthenticationException(
|
|
"Digest authentication's quality-of-protection directive of is not supported.");
|
|
authenticationFieldReply += string.Format(", qop=\"{0}\"", qop);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
string clientNonce = "X3nC3nt3r"; // todo: generate random string
|
|
if (qop != null)
|
|
authenticationFieldReply += string.Format(", cnonce=\"{0}\"", clientNonce);
|
|
|
|
string nonceCount = "00000001"; // todo: track nonces and their corresponding nonce counts
|
|
if (qop != null)
|
|
authenticationFieldReply += string.Format(", nc={0}", nonceCount);
|
|
|
|
string HA1 = "";
|
|
string scratch = string.Format("{0}:{1}:{2}", credentials.UserName, realm, credentials.Password);
|
|
if (algorithm == null || algorithm == "MD5")
|
|
HA1 = MD5Hash(scratch);
|
|
else
|
|
HA1 = MD5Hash(string.Format("{0}:{1}:{2}", MD5Hash(scratch), nonce, clientNonce));
|
|
|
|
string HA2 = "";
|
|
scratch = GetPartOrNull(header, 0);
|
|
scratch = string.Format("{0}:{1}:{2}", scratch ?? "CONNECT", uri.Host, uri.Port);
|
|
if (qop == null || qop == "auth")
|
|
HA2 = MD5Hash(scratch);
|
|
else
|
|
{
|
|
string entityBody = initialResponse[initialResponse.Count - 1]; // entity body should have been stored as last element of initialResponse
|
|
string str = string.Format("{0}:{1}", scratch, MD5Hash(entityBody));
|
|
HA2 = MD5Hash(str);
|
|
}
|
|
|
|
string response = "";
|
|
if (qop == null)
|
|
response = MD5Hash(string.Format("{0}:{1}:{2}", HA1, nonce, HA2));
|
|
else
|
|
response = MD5Hash(string.Format("{0}:{1}:{2}:{3}:{4}:{5}", HA1, nonce, nonceCount, clientNonce, qop, HA2));
|
|
|
|
authenticationFieldReply += string.Format(", response=\"{0}\"", response);
|
|
|
|
WriteLine(header, stream);
|
|
WriteLine(authenticationFieldReply, stream);
|
|
WriteLine(stream);
|
|
}
|
|
else
|
|
{
|
|
string authType = GetPartOrNull(fields[0], 1);
|
|
throw new ProxyServerAuthenticationException(
|
|
string.Format("Proxy server's {0} authentication method is not supported.", authType ?? "chosen"));
|
|
}
|
|
|
|
// handle authentication attempt response
|
|
List<string> authenticatedResponse = new List<string>();
|
|
ReadHttpHeaders(ref stream, proxy, nodelay, timeout_ms, authenticatedResponse);
|
|
if (authenticatedResponse.Count == 0)
|
|
throw new BadServerResponseException("No response from the proxy server after authentication attempt.");
|
|
switch (getResultCode(authenticatedResponse[0]))
|
|
{
|
|
case 200:
|
|
break;
|
|
case 407:
|
|
throw new ProxyServerAuthenticationException("Proxy server denied access due to wrong credentials.");
|
|
default:
|
|
throw new BadServerResponseException(string.Format(
|
|
"Received error code {0} from the server", authenticatedResponse[0]));
|
|
}
|
|
}
|
|
}
|
|
|
|
private static Stream DO_HTTP(Uri uri, IWebProxy proxy, bool nodelay, int timeout_ms, params string[] headers)
|
|
{
|
|
Stream stream = ConnectStream(uri, proxy, nodelay, timeout_ms);
|
|
|
|
int redirects = 0;
|
|
|
|
do
|
|
{
|
|
if (redirects > MAX_REDIRECTS)
|
|
throw new TooManyRedirectsException(redirects, uri);
|
|
|
|
redirects++;
|
|
|
|
foreach (string header in headers)
|
|
WriteLine(header, stream);
|
|
WriteLine(stream);
|
|
|
|
stream.Flush();
|
|
}
|
|
while (ReadHttpHeaders(ref stream, proxy, nodelay, timeout_ms));
|
|
|
|
return stream;
|
|
}
|
|
|
|
//
|
|
// The following functions do all the HTTP headers related stuff
|
|
// returning the stream ready for use
|
|
//
|
|
|
|
public static Stream CONNECT(Uri uri, IWebProxy proxy, String session, int timeout_ms)
|
|
{
|
|
return DO_HTTP(uri, proxy, true, timeout_ms,
|
|
string.Format("CONNECT {0} HTTP/1.0", uri.PathAndQuery),
|
|
string.Format("Host: {0}", uri.Host),
|
|
string.Format("Cookie: session_id={0}", session));
|
|
}
|
|
|
|
public static Stream PUT(Uri uri, IWebProxy proxy, long ContentLength, int timeout_ms)
|
|
{
|
|
return DO_HTTP(uri, proxy, false, timeout_ms,
|
|
string.Format("PUT {0} HTTP/1.0", uri.PathAndQuery),
|
|
string.Format("Host: {0}", uri.Host),
|
|
string.Format("Content-Length: {0}", ContentLength));
|
|
}
|
|
|
|
public static Stream GET(Uri uri, IWebProxy proxy, int timeout_ms)
|
|
{
|
|
return DO_HTTP(uri, proxy, false, timeout_ms,
|
|
string.Format("GET {0} HTTP/1.0", uri.PathAndQuery),
|
|
string.Format("Host: {0}", uri.Host));
|
|
}
|
|
|
|
/// <summary>
|
|
/// A general HTTP PUT method, with delegates for progress and cancelling. May throw various exceptions.
|
|
/// </summary>
|
|
/// <param name="progressDelegate">Delegate called periodically (500ms) with percent complete</param>
|
|
/// <param name="cancellingDelegate">Delegate called periodically to see if need to cancel</param>
|
|
/// <param name="uri">URI to PUT to</param>
|
|
/// <param name="proxy">A proxy to handle the HTTP connection</param>
|
|
/// <param name="path">Path to file to put</param>
|
|
/// <param name="timeout_ms">Timeout for the connection in ms. 0 for no timeout.</param>
|
|
public static void Put(UpdateProgressDelegate progressDelegate, FuncBool cancellingDelegate,
|
|
Uri uri, IWebProxy proxy, string path, int timeout_ms)
|
|
{
|
|
using (Stream fileStream = new FileStream(path, FileMode.Open, FileAccess.Read),
|
|
requestStream = PUT(uri, proxy, fileStream.Length, timeout_ms))
|
|
{
|
|
long len = fileStream.Length;
|
|
DataCopiedDelegate dataCopiedDelegate = delegate(long bytes)
|
|
{
|
|
if (progressDelegate != null && len > 0)
|
|
progressDelegate((int)((bytes * 100) / len));
|
|
};
|
|
|
|
CopyStream(fileStream, requestStream, dataCopiedDelegate, cancellingDelegate);
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// A general HTTP GET method, with delegates for progress and cancelling. May throw various exceptions.
|
|
/// </summary>
|
|
/// <param name="dataCopiedDelegate">Delegate called periodically (500 ms) with the number of bytes transferred</param>
|
|
/// <param name="cancellingDelegate">Delegate called periodically to see if need to cancel</param>
|
|
/// <param name="uri">URI to GET from</param>
|
|
/// <param name="proxy">A proxy to handle the HTTP connection</param>
|
|
/// <param name="path">Path to file to receive the data</param>
|
|
/// <param name="timeout_ms">Timeout for the connection in ms. 0 for no timeout.</param>
|
|
public static void Get(DataCopiedDelegate dataCopiedDelegate, FuncBool cancellingDelegate,
|
|
Uri uri, IWebProxy proxy, string path, int timeout_ms)
|
|
{
|
|
string tmpFile = Path.GetTempFileName();
|
|
try
|
|
{
|
|
using (Stream fileStream = new FileStream(tmpFile, FileMode.Create, FileAccess.Write, FileShare.None),
|
|
downloadStream = GET(uri, proxy, timeout_ms))
|
|
{
|
|
CopyStream(downloadStream, fileStream, dataCopiedDelegate, cancellingDelegate);
|
|
fileStream.Flush();
|
|
}
|
|
|
|
File.Delete(path);
|
|
MoveFileWithRetry(tmpFile, path);
|
|
}
|
|
finally
|
|
{
|
|
File.Delete(tmpFile);
|
|
}
|
|
}
|
|
|
|
private const int FILE_MOVE_MAX_RETRIES = 5;
|
|
private const int FILE_MOVE_SLEEP_BETWEEN_RETRIES = 100;
|
|
|
|
/// <summary>
|
|
/// Move a file, retrying a few times with a short sleep between retries.
|
|
/// If it still fails after these retries, then throw the error.
|
|
/// </summary>
|
|
public static void MoveFileWithRetry(string sourceFileName, string destFileName)
|
|
{
|
|
int retriesRemaining = FILE_MOVE_MAX_RETRIES;
|
|
do
|
|
{
|
|
try
|
|
{
|
|
File.Move(sourceFileName, destFileName);
|
|
break;
|
|
}
|
|
catch (IOException)
|
|
{
|
|
if (retriesRemaining <= 0)
|
|
throw;
|
|
System.Threading.Thread.Sleep(FILE_MOVE_SLEEP_BETWEEN_RETRIES);
|
|
}
|
|
} while (retriesRemaining-- > 0);
|
|
}
|
|
}
|
|
}
|