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using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Nop.Core;
using Nop.Core.Domain.Localization;
using Nop.Core.Http.Extensions;
using Nop.Data;
using Nop.Services.Localization;
namespace Nop.Web.Framework.Mvc.Filters;
/// <summary>
/// Represents filter attribute that checks SEO friendly URLs for multiple languages and properly redirect if necessary
/// </summary>
public sealed class CheckLanguageSeoCodeAttribute : TypeFilterAttribute
{
#region Ctor
/// <summary>
/// Create instance of the filter attribute
/// </summary>
/// <param name="ignore">Whether to ignore the execution of filter actions</param>
public CheckLanguageSeoCodeAttribute(bool ignore = false) : base(typeof(CheckLanguageSeoCodeFilter))
{
IgnoreFilter = ignore;
Arguments = [ignore];
}
#endregion
#region Properties
/// <summary>
/// Gets a value indicating whether to ignore the execution of filter actions
/// </summary>
public bool IgnoreFilter { get; }
#endregion
#region Nested filter
/// <summary>
/// Represents a filter that checks SEO friendly URLs for multiple languages and properly redirect if necessary
/// </summary>
private class CheckLanguageSeoCodeFilter : IAsyncActionFilter
{
#region Fields
protected readonly bool _ignoreFilter;
protected readonly IWebHelper _webHelper;
protected readonly IWorkContext _workContext;
protected readonly LocalizationSettings _localizationSettings;
#endregion
#region Ctor
public CheckLanguageSeoCodeFilter(bool ignoreFilter,
IWebHelper webHelper,
IWorkContext workContext,
LocalizationSettings localizationSettings)
{
_ignoreFilter = ignoreFilter;
_webHelper = webHelper;
_workContext = workContext;
_localizationSettings = localizationSettings;
}
#endregion
#region Utilities
/// <summary>
/// Called asynchronously before the action, after model binding is complete.
/// </summary>
/// <param name="context">A context for action filters</param>
/// <returns>A task that represents the asynchronous operation</returns>
private async Task CheckLanguageSeoCodeAsync(ActionExecutingContext context)
{
ArgumentNullException.ThrowIfNull(context);
//only in GET requests
if (!context.HttpContext.Request.IsGetRequest())
return;
if (!DataSettingsManager.IsDatabaseInstalled())
return;
//check whether this filter has been overridden for the Action
var actionFilter = context.ActionDescriptor.FilterDescriptors
.Where(filterDescriptor => filterDescriptor.Scope == FilterScope.Action)
.Select(filterDescriptor => filterDescriptor.Filter)
.OfType<CheckLanguageSeoCodeAttribute>()
.FirstOrDefault();
//ignore filter (an action doesn't need to be checked)
if (actionFilter?.IgnoreFilter ?? _ignoreFilter)
return;
//whether SEO friendly URLs are enabled
if (!_localizationSettings.SeoFriendlyUrlsForLanguagesEnabled)
return;
//check whether current page URL is already localized URL
var pageUrl = _webHelper.GetRawUrl(context.HttpContext.Request);
var result = await pageUrl.IsLocalizedUrlAsync(context.HttpContext.Request.PathBase, true);
if (result.IsLocalized)
return;
//not localized yet, so redirect to the page with working language SEO code
var language = await _workContext.GetWorkingLanguageAsync();
pageUrl = pageUrl.AddLanguageSeoCodeToUrl(context.HttpContext.Request.PathBase, true, language);
context.Result = new LocalRedirectResult(pageUrl, false);
}
#endregion
#region Methods
/// <summary>
/// Called asynchronously before the action, after model binding is complete.
/// </summary>
/// <param name="context">A context for action filters</param>
/// <param name="next">A delegate invoked to execute the next action filter or the action itself</param>
/// <returns>A task that represents the asynchronous operation</returns>
public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
{
await CheckLanguageSeoCodeAsync(context);
if (context.Result == null)
await next();
}
#endregion
}
#endregion
}