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//-----------------------------------------------------------------------
// <copyright file="UriHelper.cs" company="Microsoft">
// Copyright (c) Microsoft. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.AspNet {
using System;
using System.Text.RegularExpressions;
using System.Web;
using DotNetOpenAuth.Messaging;
/// <summary>
/// The uri helper.
/// </summary>
internal static class UriHelper {
#region Public Methods and Operators
/// <summary>
/// The attach query string parameter.
/// </summary>
/// <param name="url">
/// The url.
/// </param>
/// <param name="parameterName">
/// The parameter name.
/// </param>
/// <param name="parameterValue">
/// The parameter value.
/// </param>
/// <returns>
/// </returns>
public static Uri AttachQueryStringParameter(this Uri url, string parameterName, string parameterValue) {
UriBuilder builder = new UriBuilder(url);
string query = builder.Query;
if (query.Length > 1) {
// remove the '?' character in front of the query string
query = query.Substring(1);
}
string parameterPrefix = parameterName + "=";
string encodedParameterValue = Uri.EscapeDataString(parameterValue);
string newQuery = Regex.Replace(query, parameterPrefix + "[^\\&]*", parameterPrefix + encodedParameterValue);
if (newQuery == query) {
if (newQuery.Length > 0) {
newQuery += "&";
}
newQuery = newQuery + parameterPrefix + encodedParameterValue;
}
builder.Query = newQuery;
return builder.Uri;
}
/// <summary>
/// Converts an app-relative url, e.g. ~/Content/Return.cshtml, to a full-blown url, e.g. http://mysite.com/Content/Return.cshtml
/// </summary>
/// <param name="returnUrl">
/// The return URL.
/// </param>
/// <param name="context">
/// The context.
/// </param>
/// <returns>
/// </returns>
public static Uri ConvertToAbsoluteUri(string returnUrl, HttpContextBase context) {
if (Uri.IsWellFormedUriString(returnUrl, UriKind.Absolute)) {
return new Uri(returnUrl, UriKind.Absolute);
}
if (!VirtualPathUtility.IsAbsolute(returnUrl)) {
returnUrl = VirtualPathUtility.ToAbsolute(returnUrl);
}
Uri publicUrl = context.Request.GetPublicFacingUrl();
return new Uri(publicUrl, returnUrl);
}
#endregion
}
}
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