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using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text.RegularExpressions;
using Microsoft.AspNetCore.Rewrite;
namespace StardewModdingAPI.Web.Framework.RedirectRules
{
/// <summary>Redirect paths to URLs if they match a condition.</summary>
internal class RedirectPathsToUrlsRule : RedirectMatchRule
{
/*********
** Fields
*********/
/// <summary>Regex patterns matching the current URL mapped to the resulting redirect URL.</summary>
private readonly IDictionary<Regex, string> Map;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="map">Regex patterns matching the current URL mapped to the resulting redirect URL.</param>
public RedirectPathsToUrlsRule(IDictionary<string, string> map)
{
this.StatusCode = HttpStatusCode.RedirectKeepVerb;
this.Map = map.ToDictionary(
p => new Regex(p.Key, RegexOptions.IgnoreCase | RegexOptions.Compiled),
p => p.Value
);
}
/*********
** Protected methods
*********/
/// <summary>Get the new redirect URL.</summary>
/// <param name="context">The rewrite context.</param>
/// <returns>Returns the redirect URL, or <c>null</c> if the redirect doesn't apply.</returns>
protected override string? GetNewUrl(RewriteContext context)
{
string? path = context.HttpContext.Request.Path.Value;
if (!string.IsNullOrWhiteSpace(path))
{
foreach ((Regex pattern, string url) in this.Map)
{
if (pattern.IsMatch(path))
return pattern.Replace(path, url);
}
}
return null;
}
}
}
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