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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Routing;
namespace Microsoft.AspNetCore.Localization.Routing;
/// <summary>
/// Determines the culture information for a request via values in the route data.
/// </summary>
public class RouteDataRequestCultureProvider : RequestCultureProvider
{
/// <summary>
/// The key that contains the culture name.
/// Defaults to "culture".
/// </summary>
public string RouteDataStringKey { get; set; } = "culture";
/// <summary>
/// The key that contains the UI culture name. If not specified or no value is found,
/// <see cref="RouteDataStringKey"/> will be used.
/// Defaults to "ui-culture".
/// </summary>
public string UIRouteDataStringKey { get; set; } = "ui-culture";
/// <inheritdoc />
public override Task<ProviderCultureResult?> DetermineProviderCultureResult(HttpContext httpContext)
{
ArgumentNullException.ThrowIfNull(httpContext);
string? culture = null;
string? uiCulture = null;
if (!string.IsNullOrEmpty(RouteDataStringKey))
{
culture = httpContext.GetRouteValue(RouteDataStringKey)?.ToString();
}
if (!string.IsNullOrEmpty(UIRouteDataStringKey))
{
uiCulture = httpContext.GetRouteValue(UIRouteDataStringKey)?.ToString();
}
if (culture == null && uiCulture == null)
{
// No values specified for either so no match
return NullProviderCultureResult;
}
if (culture != null && uiCulture == null)
{
// Value for culture but not for UI culture so default to culture value for both
uiCulture = culture;
}
else if (culture == null && uiCulture != null)
{
// Value for UI culture but not for culture so default to UI culture value for both
culture = uiCulture;
}
var providerResultCulture = new ProviderCultureResult(culture, uiCulture);
return Task.FromResult<ProviderCultureResult?>(providerResultCulture);
}
}
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