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#if NETFX
using Apewer.Network;
using System;
using System.Collections.Generic;
using System.IO;
using System.Web;
namespace Apewer.Web
{
/// <summary>用于网站的服务程序。</summary>
public class WebsiteProvider : ApiProvider<HttpContext>
{
private HttpContext context;
private HttpRequest request;
private HttpResponse response;
/// <summary>HttpContext</summary>
public override HttpContext Context { get => context; }
/// <summary>创建服务程序实例。</summary>
/// <exception cref="ArgumentNullException"></exception>
public WebsiteProvider(HttpContext context)
{
if (context == null) throw new ArgumentNullException(nameof(context));
this.context = context;
request = context.Request;
response = context.Response;
}
#region Implement
/// <summary>写入响应前的检查,返回错误信息。</summary>
public override string PreWrite()
{
// 从 Response 头中移除 Server 和 X-Powered-By 属性。
#if NETFX
var keys = new List<string>(response.Headers.AllKeys);
#else
var keys = new List<string>(response.Headers.Keys);
#endif
if (keys.Contains("Server")) response.Headers.Remove("Server");
if (keys.Contains("X-Powered-By")) response.Headers.Remove("X-Powered-By");
return null;
}
/// <summary></summary>
public override void Sent() => response.Flush();
/// <summary>停止并关闭响应流。</summary>
public override void End() => End(false);
#endregion
#region Request
/// <summary>获取 HTTP 方法。</summary>
public override Network.HttpMethod GetMethod() => ApiUtility.Method(request.HttpMethod);
/// <summary>获取客户端的 IP 地址。</summary>
public override string GetClientIP() => request.UserHostAddress;
/// <summary>获取请求的 URL。</summary>
public override Uri GetUrl() => request.Url;
/// <summary>获取请求的 Referrer。</summary>
public override string GetReferrer() => request.UrlReferrer == null ? null : request.UrlReferrer.OriginalString;
/// <summary>获取请求的头。</summary>
public override HttpHeaders GetHeaders() => new HttpHeaders(request.Headers);
/// <summary>获取请求的内容类型。</summary>
public override string GetContentType() => request.ContentType;
/// <summary>获取请求的内容长度。</summary>
public override long GetContentLength() => request.ContentLength;
/// <summary>获取请求的内容。</summary>
public override Stream RequestBody() => request.InputStream;
#endregion
#region Response
/// <summary>设置 HTTP 状态。</summary>
public override void SetStatus(int status, int subStatus = 0)
{
response.StatusCode = status;
if (subStatus > 0) response.SubStatusCode = subStatus;
}
/// <summary>设置响应的头。</summary>
public override string SetHeader(string name, string value)
{
if (response == null || string.IsNullOrEmpty(name) || string.IsNullOrEmpty(value)) return "参数无效。";
try
{
#if NET20
response.AddHeader(name, value);
#else
response.Headers.Add(name, value);
#endif
return null;
}
catch (Exception ex) { return ex.Message; }
}
/// <summary>设置响应的缓存秒数,设置为 0 即不允许缓存。</summary>
public override void SetCache(int seconds)
{
if (seconds > 0)
{
response.CacheControl = "public";
response.Cache.SetCacheability(HttpCacheability.Public);
response.Cache.SetMaxAge(TimeSpan.FromSeconds(seconds));
response.Cache.SetProxyMaxAge(TimeSpan.FromSeconds(seconds));
response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
}
else
{
response.CacheControl = "no-cache";
response.Cache.SetCacheability(HttpCacheability.NoCache);
response.Cache.SetNoStore();
SetHeader("Pragma", "no-cache");
}
}
/// <summary>设置响应的缓存秒数。</summary>
public override void SetContentType(string value) => response.ContentType = value;
/// <summary>设置响应的内容长度。</summary>
public override void SetContentLength(long value) => SetHeader("Content-Length", value.ToString());
/// <summary>设置响应重定向。</summary>
/// <remarks>响应 302 状态。</remarks>
public override void SetRedirect(string location)
{
try { response.Redirect(location, true); } catch { }
}
/// <summary>获取 Response 流。</summary>
public override Stream ResponseBody() => response.OutputStream;
#endregion
#region This
/// <summary>停止并关闭响应流。可指定向发送缓冲区的数据。</summary>
public void End(bool flush)
{
try { if (flush) response.Flush(); } catch { }
try { response.Close(); } catch { }
// try { response.End(); } catch { }
}
/// <summary>获取 Cookies。</summary>
public StringPairs GetCookies()
{
var sp = new StringPairs();
if (request != null && request.Cookies != null)
{
#if NETFX
foreach (var key in request.Cookies.AllKeys)
{
try
{
var cookie = request.Cookies[key];
var value = cookie.Value ?? "";
sp.Add(new KeyValuePair<string, string>(key, value));
}
catch { }
}
#else
foreach (var key in request.Cookies.Keys)
{
try
{
var value = request.Cookies[key] ?? "";
sp.Add(new KeyValuePair<string, string>(key, value));
}
catch { }
}
#endif
}
return sp;
}
/// <summary>设置响应的 Cookie。</summary>
public static string SetCookie(HttpResponse response, string key, string value)
{
if (response == null) return null;
var k = key.ToTrim();
var v = value.ToTrim();
if (k.IsEmpty()) return "参数 Key 无效。";
try
{
#if NETFX
var cookie = new HttpCookie(k, v);
var now = DateTime.Now;
cookie.Expires = v.IsEmpty() ? now.AddDays(-1) : now.AddYears(1);
response.SetCookie(cookie);
#else
// var options = new CookieOptions();
// response.Cookies.Append(key, value, options);
response.Cookies.Append(key, value);
#endif
return null;
}
catch (Exception ex)
{
return ex.Message;
}
}
internal static void TrimHeaders(HttpApplication context)
{
context.PreSendRequestHeaders += (s, e) =>
{
var context = HttpContext.Current;
if (context == null) return;
var response = context.Response;
// 从 Response 头中移除 Server 和 X-Powered-By 属性。
var keys = new List<string>(response.Headers.AllKeys);
if (keys.Contains("Server")) response.Headers.Remove("Server");
if (keys.Contains("X-Powered-By")) response.Headers.Remove("X-Powered-By");
};
}
#endregion
}
}
#endif