private ICultureExpression ExtractLanguageFromUrl(HttpContext context, ICultureContext cultureContext, out string urlSpecifier, out string action)
{
ICultureOption cultureOption = cultureContext.CultureOption;
string path = context.Request.Path.Value;
if (UrlComponents.TryParse(path, out UrlComponents urlComponents))
{
action = urlComponents.Action;
context.Request.Path = new PathString(action);
urlSpecifier = urlComponents.CultureSpecifier ?? "";
if (urlSpecifier.Length > 0)
{
context.Request.PathBase = context.Request.PathBase.Add(new PathString(urlSpecifier));
}
if (urlComponents.Culture != null && checkCultureSupported && !cultureContext.CultureOption.IsCultureSupported(urlComponents.Culture))
{
return(null);
}
return(urlComponents.Culture);
}
else
{
urlSpecifier = "";
action = path;
return(null);
}
}
public Task Invoke(HttpContext context, ICultureContext cultureContext)
{
if (filter == null)
{
InvokeMiddleware(context, cultureContext);
}
else
{
UrlFilterResult filterResult = filter(context.Request.Path);
if (filterResult is InvokeMiddlewareFilterResult)
{
InvokeMiddleware(context, cultureContext);
}
else if (filterResult is SetCultureFilterResult setCultureResult)
{
cultureContext.UrlCultureSpecifier = setCultureResult.CultureSpecifier;
cultureContext.CurrentCulture = setCultureResult.Culture;
cultureContext.Action = setCultureResult.Action;
context.Request.Path = new PathString(cultureContext.Action);
context.Request.PathBase = new PathString(setCultureResult.PathBase);
}
else if (filterResult is CheckHeaderFilterResult)
{
cultureContext.UrlCultureSpecifier = "";
ICultureExpression cultureExpression = ExtractLanguageFromHeader(context, cultureContext);
if (cultureExpression == null)
{
cultureExpression = cultureContext.CultureOption.DefaultCulture;
}
cultureContext.Action = context.Request.Path;
cultureContext.CurrentCulture = cultureExpression;
}
else
{
ICultureExpression cultureExpression = cultureContext.CultureOption.DefaultCulture;
cultureContext.Action = context.Request.Path;
cultureContext.CurrentCulture = cultureExpression;
return(next(context));
}
}
string urlSpecifier = cultureContext.UrlCultureSpecifier;
if (urlSpecifier.Length <= 0)
{
return(next(context));
}
else
{
return(next(context).ContinueWith(tsk =>
{
if ((context.Response.StatusCode == 301 || context.Response.StatusCode == 302) &&
context.Response.Headers.TryGetValue("Location", out StringValues locationValue) &&
locationValue.Count > 0)
{
string location = locationValue[0];
if (UrlComponents.TryParse(location, out UrlComponents urlComponents))
{
if (urlComponents.IsRelative)
{
if (!string.IsNullOrEmpty(urlComponents.CultureSpecifier))
{
// dose not change the location
// context.Response.Headers["Location"] = urlSpecifier + context.Response.Headers["Location"];
return;
}
else
{
urlComponents.TrySetCulture(urlSpecifier);
context.Response.Headers["Location"] = urlComponents.FullActionWithQuery;
return;
}
}
else
{
string host = context.Request.Host.Value;
string requestedHost = urlComponents.FullHost;
if (requestedHost != null && requestedHost.Equals(host, StringComparison.CurrentCultureIgnoreCase))
{
if (!string.IsNullOrEmpty(urlComponents.CultureSpecifier))
{
// dose not change the location
// context.Response.Headers["Location"] = urlSpecifier + context.Response.Headers["Location"];
return;
}
else
{
urlComponents.TrySetCulture(urlSpecifier);
context.Response.Headers["Location"] = urlComponents.FullActionWithQuery;
return;
}
}
else
{
// dose not change the location
// context.Response.Headers["Location"] = urlSpecifier + context.Response.Headers["Location"];
return;
}
}
}
else
{
// dose not change the location
// context.Response.Headers["Location"] = urlSpecifier + context.Response.Headers["Location"];
}
}
}));
}
}