190 lines
6.5 KiB
C#
190 lines
6.5 KiB
C#
using HttpContext = Microsoft.AspNetCore.Http.HttpContext;
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namespace System.Web;
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public static class HttpRequestExtensions
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{
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public static readonly string UrlRewriterHeader = "X-REWRITER-URL";
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public static Uri GetUrlRewriter(this HttpRequest request)
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{
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return request != null ? GetUrlRewriter(request.Headers, request) : null;
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}
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public static Uri Url(this HttpRequest request)
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{
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return request != null ? new Uri(request.GetDisplayUrl()) : null;
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}
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/*public static Uri GetUrlRewriter(this HttpRequestBase request)
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{
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return request != null ? GetUrlRewriter(request.Headers, request.Url) : null;
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}*/
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public static Uri GetUrlRewriter(IHeaderDictionary headers, HttpRequest request)
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{
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if (headers != null)
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{
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var h = headers[UrlRewriterHeader];
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var rewriterUri = !string.IsNullOrEmpty(h) ? ParseRewriterUrl(h) : null;
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if (request != null && rewriterUri != null)
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{
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var result = new UriBuilder()
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{
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Scheme = rewriterUri.Scheme,
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Host = rewriterUri.Host,
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Port = rewriterUri.Port
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};
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result.Query = request.QueryString.Value;
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result.Path = request.Path.Value;
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return result.Uri;
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}
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}
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if (request != null && request.Query != null)
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{
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var h = request.Query[UrlRewriterHeader];
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var rewriterUri = !string.IsNullOrEmpty(h) ? ParseRewriterUrl(h) : null;
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if (rewriterUri != null)
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{
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var result = new UriBuilder()
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{
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Scheme = rewriterUri.Scheme,
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Host = rewriterUri.Host,
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Port = rewriterUri.Port
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};
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result.Query = request.QueryString.Value;
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result.Path = request.Path.Value;
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return result.Uri;
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}
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}
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return request.Url();
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}
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public static Uri PushRewritenUri(this HttpContext context)
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{
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return context != null ? PushRewritenUri(context, GetUrlRewriter(context.Request)) : null;
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}
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public static Uri PushRewritenUri(this HttpContext context, Uri rewrittenUri)
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{
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Uri oldUri = null;
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if (context != null)
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{
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var request = context.Request;
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var url = new Uri(request.GetDisplayUrl());
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if (url != rewrittenUri)
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{
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var requestUri = url;
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try
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{
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//Push it
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request.Headers.SetCommaSeparatedValues("HTTPS", rewrittenUri.Scheme.Equals("https", StringComparison.OrdinalIgnoreCase) ? "on" : "off");
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request.Headers.SetCommaSeparatedValues("SERVER_NAME", rewrittenUri.Host);
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request.Headers.SetCommaSeparatedValues("SERVER_PORT",
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rewrittenUri.Port.ToString(CultureInfo.InvariantCulture));
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if (rewrittenUri.IsDefaultPort)
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{
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request.Headers.SetCommaSeparatedValues("HTTP_HOST",
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rewrittenUri.Host);
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}
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else
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{
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request.Headers.SetCommaSeparatedValues("HTTP_HOST",
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rewrittenUri.Host + ":" + requestUri.Port);
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}
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//Hack:
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typeof(HttpRequest).InvokeMember("_url",
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BindingFlags.NonPublic | BindingFlags.SetField |
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BindingFlags.Instance,
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null, request,
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new object[] { null });
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oldUri = requestUri;
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context.Items["oldUri"] = oldUri;
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}
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catch (Exception) { }
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}
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}
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return oldUri;
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}
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public static Uri PopRewritenUri(this HttpContext context)
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{
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if (context != null && context.Items["oldUri"] != null)
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{
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var rewriteTo = context.Items["oldUri"] as Uri;
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if (rewriteTo != null)
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{
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return PushRewritenUri(context, rewriteTo);
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}
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}
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return null;
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}
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public static bool DesktopApp(this HttpRequest request)
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{
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return request != null
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&& (!string.IsNullOrEmpty(request.Query["desktop"])
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|| !string.IsNullOrEmpty(request.Headers[HeaderNames.UserAgent]) && request.Headers[HeaderNames.UserAgent].ToString().Contains("AscDesktopEditor"));
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}
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public static bool SailfishApp(this HttpRequest request)
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{
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return request != null
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&& (!string.IsNullOrEmpty(request.Headers["sailfish"])
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|| !string.IsNullOrEmpty(request.Headers[HeaderNames.UserAgent]) && request.Headers[HeaderNames.UserAgent].ToString().Contains("SailfishOS"));
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}
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public static string GetUserHostAddress(this HttpRequest request)
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{
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return request.HttpContext.Features.Get<IHttpConnectionFeature>()?.RemoteIpAddress.ToString();
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}
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private static Uri ParseRewriterUrl(string s)
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{
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if (string.IsNullOrEmpty(s))
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{
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return null;
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}
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const StringComparison cmp = StringComparison.OrdinalIgnoreCase;
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if (0 < s.Length && s.StartsWith('0'))
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{
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s = Uri.UriSchemeHttp + s.Substring(1);
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}
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else if (3 < s.Length && s.StartsWith("OFF", cmp))
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{
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s = Uri.UriSchemeHttp + s.Substring(3);
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}
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else if (0 < s.Length && s.StartsWith('1'))
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{
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s = Uri.UriSchemeHttps + s.Substring(1);
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}
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else if (2 < s.Length && s.StartsWith("ON", cmp))
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{
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s = Uri.UriSchemeHttps + s.Substring(2);
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}
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else if (s.StartsWith(Uri.UriSchemeHttp + "%3A%2F%2F", cmp) || s.StartsWith(Uri.UriSchemeHttps + "%3A%2F%2F", cmp))
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{
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s = HttpUtility.UrlDecode(s);
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}
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Uri.TryCreate(s, UriKind.Absolute, out var result);
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return result;
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}
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}
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