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using System;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Rewrite;
namespace StardewModdingAPI.Web.Framework.RewriteRules
{
/// <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 ConditionalRewriteSubdomainRule : IRule
{
/*********
** Accessors
*********/
/// <summary>A predicate which indicates when the rule should be applied.</summary>
private readonly Func<HttpRequest, bool> ShouldRewrite;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="shouldRewrite">A predicate which indicates when the rule should be applied.</param>
public ConditionalRewriteSubdomainRule(Func<HttpRequest, bool> shouldRewrite = null)
{
this.ShouldRewrite = shouldRewrite ?? (req => true);
}
/// <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)
{
HttpRequest request = context.HttpContext.Request;
// check condition
if (!this.ShouldRewrite(request))
return;
// get host parts
string host = request.Host.Host;
string[] parts = host.Split('.');
if (parts.Length < 2)
return;
// prepend to path
request.Path = $"/{parts[0]}{request.Path}";
}
}
}
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