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using System;
using System.Linq;
using System.Text.RegularExpressions;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Rewrite;
namespace StardewModdingAPI.Web.Framework
{
/// <summary>Rewrite requests to prepend the subdomain portion (if any) to the path.</summary>
/// <remarks>Derived from <a href="https://stackoverflow.com/a/44526747/262123" />.</remarks>
internal class RewriteSubdomainRule : IRule
{
/*********
** Accessors
*********/
/// <summary>The paths (excluding the hostname portion) to not rewrite.</summary>
public Regex[] ExceptPaths { get; set; }
/*********
** Public methods
*********/
/// <summary>Applies the rule. Implementations of ApplyRule should set the value for <see cref="RewriteContext.Result" /> (defaults to RuleResult.ContinueRules).</summary>
/// <param name="context">The rewrite context.</param>
public void ApplyRule(RewriteContext context)
{
context.Result = RuleResult.ContinueRules;
HttpRequest request = context.HttpContext.Request;
// check ignores
if (this.ExceptPaths?.Any(pattern => pattern.IsMatch(request.Path)) == true)
return;
// get host parts
string host = request.Host.Host;
string[] parts = host.Split('.');
// validate
if (parts.Length < 2)
return;
if (parts.Length < 3 && !"localhost".Equals(parts[1], StringComparison.InvariantCultureIgnoreCase))
return;
// prepend to path
request.Path = $"/{parts[0]}{request.Path}";
}
}
}
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