/// <summary>
/// Emits an <see cref="OptionsResult"/> which lists the allowed
/// HTTP verbs.
/// <para>
/// Catches <see cref="ValidationException"/> and converts it to
/// an appropriate <see cref="IActionResult"/>.
/// </para>
/// <para>Requires usage of <see cref="HttpContextProviderAttribute"/>.</para>
/// </summary>
/// <typeparam name="TSource">The type of the value.</typeparam>
/// <param name="observable">The parent observable.</param>
/// <param name="factory">A factory function for the allowed HTTP verbs.</param>
/// <returns>An instance of <see cref="IProviderObservable{IActionResult}"/>.</returns>
public static IProviderObservable <IActionResult> ToOptionsResult <TSource>(
this IProviderObservable <TSource> observable,
Func <AllowedOptionsBuilder <TSource>, AllowedOptionsBuilder <TSource> > factory)
{
Check.IsNull(factory, nameof(factory));
return(observable.ToOptionsResult(s =>
{
var httpContext = observable.ServiceProvider
.GetRequiredService <IScopedStorage <HttpContext> >();
var allowedOptionsBuilder = new AllowedOptionsBuilder <TSource>(
httpContext?.Value.User);
return factory(allowedOptionsBuilder)
.GenerateAllowedVerbs(s);
}));
}
