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HttpUtils.cs
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//Copyright (c) ServiceStack, Inc. All Rights Reserved.
//License: https://raw.github.com/ServiceStack/ServiceStack/master/license.txt
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using ServiceStack.Text;
namespace ServiceStack;
public static partial class HttpUtils
{
public static string UserAgent = "ServiceStack.Text" +
#if NET6_0_OR_GREATER
"/net6"
#elif NETSTANDARD2_0
"/std2.0"
#elif NETFX
"/net472"
#else
"/unknown"
#endif
;
public static Encoding UseEncoding { get; set; } = new UTF8Encoding(false);
public static string AddQueryParam(this string url, string key, object val, bool encode = true)
{
return url.AddQueryParam(key, val?.ToString(), encode);
}
public static string AddQueryParam(this string url, object key, string val, bool encode = true)
{
return AddQueryParam(url, key?.ToString(), val, encode);
}
public static string AddQueryParam(this string url, string key, string val, bool encode = true)
{
if (url == null)
url = "";
if (key == null || val == null)
return url;
var prefix = string.Empty;
if (!url.EndsWith("?") && !url.EndsWith("&"))
{
prefix = url.IndexOf('?') == -1 ? "?" : "&";
}
return url + prefix + key + "=" + (encode ? val.UrlEncode() : val);
}
public static string SetQueryParam(this string url, string key, string val)
{
if (url == null)
url = "";
if (key == null || val == null)
return url;
var qsPos = url.IndexOf('?');
if (qsPos != -1)
{
var existingKeyPos = qsPos + 1 == url.IndexOf(key + "=", qsPos, StringComparison.Ordinal)
? qsPos
: url.IndexOf("&" + key, qsPos, StringComparison.Ordinal);
if (existingKeyPos != -1)
{
var endPos = url.IndexOf('&', existingKeyPos + 1);
if (endPos == -1)
endPos = url.Length;
var newUrl = url.Substring(0, existingKeyPos + key.Length + 1)
+ "="
+ val.UrlEncode()
+ url.Substring(endPos);
return newUrl;
}
}
var prefix = qsPos == -1 ? "?" : "&";
return url + prefix + key + "=" + val.UrlEncode();
}
public static string AddHashParam(this string url, string key, object val)
{
return url.AddHashParam(key, val?.ToString());
}
public static string AddHashParam(this string url, string key, string val)
{
if (url == null)
url = "";
if (key == null || val == null)
return url;
var prefix = url.IndexOf('#') == -1 ? "#" : "/";
return url + prefix + key + "=" + val.UrlEncode();
}
public static string SetHashParam(this string url, string key, string val)
{
if (url == null)
url = "";
if (key == null || val == null)
return url;
var hPos = url.IndexOf('#');
if (hPos != -1)
{
var existingKeyPos = hPos + 1 == url.IndexOf(key + "=", hPos, PclExport.Instance.InvariantComparison)
? hPos
: url.IndexOf("/" + key, hPos, PclExport.Instance.InvariantComparison);
if (existingKeyPos != -1)
{
var endPos = url.IndexOf('/', existingKeyPos + 1);
if (endPos == -1)
endPos = url.Length;
var newUrl = url.Substring(0, existingKeyPos + key.Length + 1)
+ "="
+ val.UrlEncode()
+ url.Substring(endPos);
return newUrl;
}
}
var prefix = url.IndexOf('#') == -1 ? "#" : "/";
return url + prefix + key + "=" + val.UrlEncode();
}
public static bool HasRequestBody(string httpMethod)
{
switch (httpMethod)
{
case HttpMethods.Get:
case HttpMethods.Delete:
case HttpMethods.Head:
case HttpMethods.Options:
return false;
}
return true;
}
public static Task<Stream> GetRequestStreamAsync(this WebRequest request)
{
return GetRequestStreamAsync((HttpWebRequest)request);
}
public static Task<Stream> GetRequestStreamAsync(this HttpWebRequest request)
{
var tcs = new TaskCompletionSource<Stream>();
try
{
request.BeginGetRequestStream(iar =>
{
try
{
var response = request.EndGetRequestStream(iar);
tcs.SetResult(response);
}
catch (Exception exc)
{
tcs.SetException(exc);
}
}, null);
}
catch (Exception exc)
{
tcs.SetException(exc);
}
return tcs.Task;
}
public static Task<TBase> ConvertTo<TDerived, TBase>(this Task<TDerived> task) where TDerived : TBase
{
var tcs = new TaskCompletionSource<TBase>();
task.ContinueWith(t => tcs.SetResult(t.Result), TaskContinuationOptions.OnlyOnRanToCompletion);
task.ContinueWith(t => tcs.SetException(t.Exception.InnerExceptions), TaskContinuationOptions.OnlyOnFaulted);
task.ContinueWith(t => tcs.SetCanceled(), TaskContinuationOptions.OnlyOnCanceled);
return tcs.Task;
}
public static Task<WebResponse> GetResponseAsync(this WebRequest request)
{
return GetResponseAsync((HttpWebRequest)request).ConvertTo<HttpWebResponse, WebResponse>();
}
public static Task<HttpWebResponse> GetResponseAsync(this HttpWebRequest request)
{
var tcs = new TaskCompletionSource<HttpWebResponse>();
try
{
request.BeginGetResponse(iar =>
{
try
{
var response = (HttpWebResponse)request.EndGetResponse(iar);
tcs.SetResult(response);
}
catch (Exception exc)
{
tcs.SetException(exc);
}
}, null);
}
catch (Exception exc)
{
tcs.SetException(exc);
}
return tcs.Task;
}
public static bool IsAny300(this Exception ex)
{
var status = ex.GetStatus();
return status is >= HttpStatusCode.MultipleChoices and < HttpStatusCode.BadRequest;
}
public static bool IsAny400(this Exception ex)
{
var status = ex.GetStatus();
return status is >= HttpStatusCode.BadRequest and < HttpStatusCode.InternalServerError;
}
public static bool IsAny500(this Exception ex)
{
var status = ex.GetStatus();
return status >= HttpStatusCode.InternalServerError && (int)status < 600;
}
public static bool IsNotModified(this Exception ex)
{
return GetStatus(ex) == HttpStatusCode.NotModified;
}
public static bool IsBadRequest(this Exception ex)
{
return GetStatus(ex) == HttpStatusCode.BadRequest;
}
public static bool IsNotFound(this Exception ex)
{
return GetStatus(ex) == HttpStatusCode.NotFound;
}
public static bool IsUnauthorized(this Exception ex)
{
return GetStatus(ex) == HttpStatusCode.Unauthorized;
}
public static bool IsForbidden(this Exception ex)
{
return GetStatus(ex) == HttpStatusCode.Forbidden;
}
public static bool IsInternalServerError(this Exception ex)
{
return GetStatus(ex) == HttpStatusCode.InternalServerError;
}
public static HttpStatusCode? GetStatus(this Exception ex)
{
#if NET6_0_OR_GREATER
if (ex is System.Net.Http.HttpRequestException httpEx)
return GetStatus(httpEx);
#endif
if (ex is WebException webEx)
return GetStatus(webEx);
if (ex is IHasStatusCode hasStatus)
return (HttpStatusCode)hasStatus.StatusCode;
return null;
}
#if NET6_0_OR_GREATER
public static HttpStatusCode? GetStatus(this System.Net.Http.HttpRequestException ex) => ex.StatusCode;
#endif
public static HttpStatusCode? GetStatus(this WebException webEx)
{
var httpRes = webEx?.Response as HttpWebResponse;
return httpRes?.StatusCode;
}
public static bool HasStatus(this Exception ex, HttpStatusCode statusCode)
{
return GetStatus(ex) == statusCode;
}
public static string GetResponseBody(this Exception ex)
{
if (!(ex is WebException webEx) || webEx.Response == null || webEx.Status != WebExceptionStatus.ProtocolError)
return null;
var errorResponse = (HttpWebResponse)webEx.Response;
using var responseStream = errorResponse.GetResponseStream();
return responseStream.ReadToEnd(UseEncoding);
}
public static async Task<string> GetResponseBodyAsync(this Exception ex, CancellationToken token = default)
{
if (!(ex is WebException webEx) || webEx.Response == null || webEx.Status != WebExceptionStatus.ProtocolError)
return null;
var errorResponse = (HttpWebResponse)webEx.Response;
using var responseStream = errorResponse.GetResponseStream();
return await responseStream.ReadToEndAsync(UseEncoding).ConfigAwait();
}
public static string ReadToEnd(this WebResponse webRes)
{
using var stream = webRes.GetResponseStream();
return stream.ReadToEnd(UseEncoding);
}
public static Task<string> ReadToEndAsync(this WebResponse webRes)
{
using var stream = webRes.GetResponseStream();
return stream.ReadToEndAsync(UseEncoding);
}
public static IEnumerable<string> ReadLines(this WebResponse webRes)
{
using var stream = webRes.GetResponseStream();
using var reader = new StreamReader(stream, UseEncoding, true, 1024, leaveOpen: true);
string line;
while ((line = reader.ReadLine()) != null)
{
yield return line;
}
}
}
//Allow Exceptions to Customize HTTP StatusCode and StatusDescription returned
public interface IHasStatusCode
{
int StatusCode { get; }
}
public interface IHasStatusDescription
{
string StatusDescription { get; }
}