最近有個客戶要求開發一套短網址網站，小編現在都使用.net core進行網站開發了，以是厘厘思路，想想使用.net core 的中間件應該很容易實現。

using Microsoft.AspNetCore.Builder;

using Microsoft.AspNetCore.Http;

using Microsoft.Extensions.Logging;

using NetCoreTFCMS.Domain.DbModel;

using System.Text.RegularExpressions;

using System.Threading.Tasks;

using TianFeng.FrameworkCore.DapperEx;

namespace NetCoreTFCMS.MiddleWare

{

public static class RequestIPExtensions

{

public static IApplicationBuilder UseWatchNoFound(this IApplicationBuilder builder)

{

return builder.UseMiddleware<WatchNoFoundMiddleWare>();

}

}

public class WatchNoFoundMiddleWare

{

private readonly RequestDelegate _next;

private readonly ILogger logger;

public WatchNoFoundMiddleWare(RequestDelegate next, ILoggerFactory loggerFactory)

{

_next = next;

logger = loggerFactory.CreateLogger<WatchNoFoundMiddleWare>();

}

public async Task Invoke(HttpContext context)

{

await _next.Invoke(context);

var path = context.Request.Path.ToString().Trim();

if (path.LastIndexOf("/") == 0)

{

var salt = path.Replace("/", "");

if (Regex.IsMatch(salt, @"^[a-zA-Z0-9]{6}$"))

{

var db = (IDbService)context.RequestServices.GetService(typeof(IDbService));

var model = await db.GetModelAsync<Link>(new { Salt = salt });

if (model != null)

{

if (!Regex.IsMatch(model.SiteUrl, "(file|gopher|news|nntp|telnet|http|ftp|https|ftps|sftp)://", RegexOptions.IgnoreCase))

{

model.SiteUrl = "http://" + model.SiteUrl;

}

context.Response.Redirect(model.SiteUrl, true);

}

else

{

logger.LogInformation(salt + "無匹配網址");

}

}

}

}

}

}

app.UseWatchNoFound();

這樣該中間件就會響應短網址的六位字符串，如果匹配則重定向至對應的網址。

具體的短網址生成，我想就很簡單，這里就不多說了，如果有需要，大家可以咨詢我。

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