418 lines
12 KiB
C#
418 lines
12 KiB
C#
namespace Web12306.Servers.TrainSuggestion
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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.Linq;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Web;
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using System.Web.Hosting;
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using Newtonsoft.Json;
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using Newtonsoft.Json.Serialization;
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public class TrainSuggestionHandler : IHttpHandler
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{
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#region Implementation of IHttpHandler
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/// <summary>
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/// 通过实现 <see cref="T:System.Web.IHttpHandler"/> 接口的自定义 HttpHandler 启用 HTTP Web 请求的处理。
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/// </summary>
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/// <param name="context"><see cref="T:System.Web.HttpContext"/> 对象，它提供对用于为 HTTP 请求提供服务的内部服务器对象（如 Request、Response、Session 和 Server）的引用。</param>
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public void ProcessRequest(HttpContext context)
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{
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var request = context.Request;
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context.Response.StatusCode = 404;
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if (request.UrlReferrer == null || !Regex.IsMatch(request.UrlReferrer.Host, @"^.*?\.(fishlee\.net|liebao\.cn)$"))
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return;
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//check code
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var r = request.QueryString["r"];
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if (string.IsNullOrEmpty(r))
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return;
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var data = request.Form["data"];
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if (string.IsNullOrEmpty(data))
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return;
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var crc = GetTextCrc(data);
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if (!r.EndsWith(crc + ""))
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{
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return;
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}
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var origin = request.Headers["Origin"];
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var callback = request.QueryString["calllback"];
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if (!string.IsNullOrEmpty(origin))
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{
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if (Regex.IsMatch(origin, @"^(https?://.*?\.(fishlee\.net|liebao\.cn)|chrome-extension://.*)$"))
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context.Response.AddHeader("Access-Control-Allow-Origin", origin);
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else
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{
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//非法提交
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return;
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}
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}
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else
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{
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return;
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}
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context.Response.ContentType = string.IsNullOrEmpty(callback) ? "application/json" : "application/javascript";
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context.Response.BufferOutput = true;
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context.Response.StatusCode = 200;
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try
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{
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var ri = JsonConvert.DeserializeObject<RequestInfo>(data);
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var suggestion = GetSuggestionResponseContent(ri);
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if (!string.IsNullOrEmpty(callback))
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{
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context.Response.Write(callback + "(");
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}
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context.Response.Write(suggestion);
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if (!string.IsNullOrEmpty(callback))
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{
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context.Response.Write(callback + ");");
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}
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}
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catch (Exception ex)
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{
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//log error
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var sb = new StringBuilder();
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sb.AppendLine(string.Format("请求URL： {0}", context.Request.Url));
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sb.AppendLine("数据:");
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sb.AppendLine(data);
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sb.AppendLine();
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sb.AppendLine("错误信息:");
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sb.AppendLine(ex.ToString());
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var log = DateTime.Now.Ticks + ".log";
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var path = HostingEnvironment.MapPath("~/errors/tr/");
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path = PathUtility.Combine(path, log);
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Directory.CreateDirectory(Path.GetDirectoryName(path));
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File.WriteAllText(path, sb.ToString());
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}
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}
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int GetTextCrc(string txt)
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{
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var crc = 0;
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for (var i = 0; i < txt.Length - 1; i += 2)
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{
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crc += txt[i] ^ txt[i + 1];
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if (crc > 48360)
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crc -= 36048;
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}
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if (txt.Length % 2 == 1)
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crc += txt[txt.Length - 1];
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if (crc > 48360)
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crc -= 36048;
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crc = crc ^ 5299;
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return crc;
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}
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/// <summary>
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/// 获取一个值，该值指示其他请求是否可以使用 <see cref="T:System.Web.IHttpHandler"/> 实例。
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/// </summary>
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/// <returns>
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/// 如果 <see cref="T:System.Web.IHttpHandler"/> 实例可再次使用，则为 true；否则为 false。
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/// </returns>
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public bool IsReusable { get { return true; } }
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#endregion
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#region 生成建议
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static JsonSerializerSettings _camelJsonSetting = new JsonSerializerSettings
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{
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ContractResolver = new CamelCasePropertyNamesContractResolver()
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};
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string GetSuggestionResponseContent(RequestInfo ri)
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{
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if (ri.CheckIllegal())
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return string.Empty;
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return JsonConvert.SerializeObject(GetSuggestionResponseContentCore(ri), Formatting.None, _camelJsonSetting);
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}
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SuggestionResponse GetSuggestionResponseContentCore(RequestInfo ri)
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{
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//预处理
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PreProcessRequestData(ri);
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//获得所有的可替换站点
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var alllines = ri.Stops.Values.SelectMany(s => GetAlternativeLines(s, ri.Date) ?? new List<AlternativeLine>()).Where(s => s != null).ToArray();
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//对线路进行分组排序
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var lineGrouped = alllines.GroupBy(s => s.LineName).Select(s =>
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{
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var list = s.ToList();
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var f = list[0];
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return new AlternativeLineGroup(f.From.Name, f.To.Name, f.Date, list, f.IsCrossDate);
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}).ToList();
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//过滤
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FilteAlternativeLine(ri, lineGrouped);
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//填充数据
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FillExtraInfo(ri, lineGrouped);
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//排序
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SortLineRecommand(ri, lineGrouped);
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return new SuggestionResponse()
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{
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Key = "盗用可耻，鄙视无耻的各个国产IT同行！",
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Accepted = true,
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Groups = lineGrouped
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};
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}
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void PreProcessRequestData(RequestInfo ri)
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{
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ri.PreprocessData();
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}
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void FilteAlternativeLine(RequestInfo ri, List<AlternativeLineGroup> line)
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{
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for (var i = line.Count - 1; i >= 0; i--)
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{
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var train = ri.Stops[line[i].Lines[0].TrainCode];
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var maxAllowElapsedTime = train.TrainInfo.elapsedTime.Value.Add(train.TrainInfo.elapsedTime.MaxAddTime);
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for (var j = line[i].Lines.Count - 1; j >= 0; j--)
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{
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var current = line[i].Lines[j];
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//如果同时是发站和到站，则删除不推荐
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if (current.From.IsOriginal && current.To.IsOriginal)
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line[i].Lines.RemoveAt(j);
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//如果时间会超过原来最大的允许值，则排除
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else if (current.ElapsedTime > maxAllowElapsedTime)
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line[i].Lines.RemoveAt(j);
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}
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if (line[i].Lines.Count == 0)
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{
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line.RemoveAt(i);
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}
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}
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}
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/// <summary>
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/// 根据停靠站获得权重
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/// </summary>
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/// <param name="lineList"></param>
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/// <returns></returns>
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int GetLineStationEndpointWeight(List<AlternativeLine> lineList)
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{
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var point = 0;
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foreach (var line in lineList)
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{
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if (line.From.IsEndPoint && line.To.IsEndPoint)
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point += 2;
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else if (line.From.IsEndPoint || line.To.IsEndPoint)
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point += 1;
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}
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return point;
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}
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void SortLineRecommand(RequestInfo ri, List<AlternativeLineGroup> line)
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{
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line.Sort((x, y) =>
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{
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var ceo1 = GetLineStationEndpointWeight(x.Lines);
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var ceo2 = GetLineStationEndpointWeight(y.Lines);
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if (ceo1 != ceo2)
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return ceo2 - ceo1;
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if (x.Lines.Count != y.Lines.Count)
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return y.Lines.Count - x.Lines.Count;
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//再看停靠时间
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var ep1 = (int)x.Lines.Min(s => s.From.StopTime + s.To.StopTime).TotalSeconds;
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var ep2 = (int)y.Lines.Min(s => s.From.StopTime + s.To.StopTime).TotalSeconds;
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if (ep1 != ep2)
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return ep2 - ep1;
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//再看价格
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var ap1 = x.Lines.Min(s => s.Radio);
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var ap2 = y.Lines.Min(s => s.Radio);
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if (ap1 != ap2)
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return ap1 - ap2;
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return 0;
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});
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//最多推荐5条线路
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if (line.Count > 5)
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line.RemoveRange(5, line.Count - 5);
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//再对组内排序
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foreach (var current in line)
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{
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current.Lines.Sort((x, y) =>
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{
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//再看停靠时间
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var ep1 = (int)(x.From.StopTime + x.To.StopTime).TotalSeconds;
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var ep2 = (int)(y.From.StopTime + y.To.StopTime).TotalSeconds;
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if (ep1 != ep2)
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return ep2 - ep1;
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//再看价格
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var ap1 = (int)x.ExtraPrice;
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var ap2 = (int)y.ExtraPrice;
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if (ap1 != ap2)
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return ap1 - ap2;
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return 0;
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});
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}
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}
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void FillExtraInfo(RequestInfo ri, List<AlternativeLineGroup> line)
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{
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for (var i = line.Count - 1; i >= 0; i--)
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{
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for (var j = line[i].Lines.Count - 1; j >= 0; j--)
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{
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var train = ri.Stops[line[i].Lines[j].TrainCode];
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var current = line[i].Lines[j];
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var originalTime = train.TrainInfo.elapsedTime.Value;
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//如果时间会超过原来最大的允许值，则排除
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var priceExtraRadio = ((current.ElapsedTime - originalTime).TotalSeconds / (1.0 * originalTime.TotalSeconds));
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current.BasePriceSeat = Cn12306SuggestionUtility.BaseSeatCodes.First(s => train.TrainInfo.ticketMap.ContainsKey(s));
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current.BasePrice = train.TrainInfo.ticketMap[current.BasePriceSeat].price / 10.0;
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current.ExtraPrice = Math.Round(priceExtraRadio * current.BasePrice, 2);
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current.Radio = (int)(priceExtraRadio * 100);
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}
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}
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}
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List<AlternativeLine> GetAlternativeLines(TrainInfoItem train, DateTime requestDate)
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{
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var info = train.TrainInfo;
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var stops = train.StopInfos;
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var indexFrom = Array.FindIndex(stops, s => s.station_name == info.from.name);
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var indexTo = Array.FindIndex(stops, indexFrom + 1, s => s.station_name == info.to.name);
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if (indexFrom == -1 || indexTo == -1)
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return null;
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var altFrom = new List<AlternativeStation>();
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var altTo = new List<AlternativeStation>();
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var maxAddTime = train.TrainInfo.elapsedTime.MaxAddTime;
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if (indexFrom != 0)
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{
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var stopTimeFrom = stops[indexFrom].StopTime;
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var arriveTime = stops[indexFrom].ArriveTime;
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for (var i = 0; i < indexFrom; i++)
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{
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//如果isEnabled为true，则说明会停靠这个站点。不能推荐更短的。
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//如果时间过久，则不做推荐
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if (stops[i].isEnabled || stops[i].StartTime - arriveTime > maxAddTime)
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continue;
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var stopTime = i == 0 ? TimeSpan.Zero : stops[i].StopTime;
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if (i != 0)
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{
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//对于非始发站，停靠时间相同或更短，则不做推荐。
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if (stopTime < stopTimeFrom && i < indexFrom - 3)
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continue;
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}
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//添加到推荐列表中
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altFrom.Add(new AlternativeStation()
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{
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ArriveTime = stops[i].StartTime,
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IsEndPoint = i == 0,
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IsFromStation = true,
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Name = stops[i].station_name,
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StopTime = stopTime,
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TrainID = info.id,
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TrainCode = info.code,
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Date = stops[i].StartTime,
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IsCrossDate = requestDate != stops[i].StartTime.Date
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});
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}
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//排序
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altFrom.Sort(new AlternativeStationComparer());
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if (altFrom.Count > 5)
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altFrom.RemoveRange(5, altFrom.Count - 5);
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}
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if (indexTo != stops.Length - 1)
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{
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var stopTimeTo = stops[indexTo].StopTime;
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var startTime = stops[indexTo].StartTime;
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for (var i = stops.Length - 1; i >= indexTo; i--)
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{
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//如果isEnabled为true，则说明会停靠这个站点。不能推荐更短的。
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//如果时间过久，则不做推荐
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if (stops[i].isEnabled || stops[i].ArriveTime - startTime > maxAddTime)
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continue;
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var stopTime = i == 0 ? TimeSpan.Zero : stops[i].StopTime;
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if (i != stops.Length - 1)
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{
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//对于非终到站，停靠时间相同或更短，则不做推荐。
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if (stopTime < stopTimeTo && i > indexTo + 3)
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continue;
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}
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//添加到推荐列表中
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altTo.Add(new AlternativeStation()
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{
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ArriveTime = stops[i].ArriveTime,
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IsEndPoint = i == stops.Length - 1,
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IsFromStation = false,
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Name = stops[i].station_name,
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TrainID = info.id,
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StopTime = stopTime,
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TrainCode = info.code
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});
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}
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altTo.Sort(new AlternativeStationComparer());
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if (altTo.Count > 5)
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altTo.RemoveRange(5, altTo.Count - 5);
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}
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//plus 原始线路
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altFrom.Add(new AlternativeStation
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{
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ArriveTime = stops[indexFrom].StartTime,
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IsEndPoint = indexFrom == 0,
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IsFromStation = true,
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Name = stops[indexFrom].station_name,
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StopTime = indexFrom == 0 ? TimeSpan.Zero : stops[indexFrom].StopTime,
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TrainCode = info.code,
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IsOriginal = true,
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TrainID = info.id,
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IsCrossDate = false,
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Date = stops[indexFrom].StartTime
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});
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altTo.Add(new AlternativeStation
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{
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ArriveTime = stops[indexTo].ArriveTime,
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IsEndPoint = indexTo == stops.Length - 1,
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IsFromStation = false,
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TrainID = info.id,
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Name = stops[indexTo].station_name,
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StopTime = indexTo == stops.Length - 1 ? TimeSpan.Zero : stops[indexFrom].StopTime,
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TrainCode = info.code,
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IsOriginal = true
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});
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var lines = altFrom.CrossJoin(altTo).Where(s => !s.Key.IsOriginal || !s.Value.IsOriginal).Select(s => new AlternativeLine(s.Key, s.Value, s.Key.Date, s.Key.IsCrossDate) { TrainCode = s.Key.TrainCode, TrainId = s.Key.TrainID }).ToList();
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return lines;
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}
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#endregion
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}
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} |