/// <summary>
/// If the check returns <c>false</c>, <see cref="ValidationException"/>
/// is emitted as an error with the status code 403 (Forbidden).
/// Otherwise the given value is emitted.
/// <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="claimType">The claim type.</param>
/// <param name="claimFactory">The claim factory.</param>
/// <param name="error">The error to be used on a failed check.</param>
/// <returns>An instance of <see cref="IProviderObservable{TSource}"/>.</returns>
public static IProviderObservable <TSource> CurrentUserHasClaim <TSource>(
this IProviderObservable <TSource> observable,
string claimType,
Func <TSource, string> claimFactory,
object error) =>
observable.CurrentUserHas(
(p, s) => p.HasClaim(claimType, claimFactory(s)), s => error);
/// <summary>
/// If the check returns <c>false</c>, <see cref="ValidationException"/>
/// is emitted as an error with the status code 403 (Forbidden).
/// Otherwise the given value is emitted.
/// <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="principalCheck">The principal check function.</param>
/// <param name="error">The error to be used on a failed check.</param>
/// <returns>An instance of <see cref="IProviderObservable{TSource}"/>.</returns>
public static IProviderObservable <TSource> CurrentUserHas <TSource>(
this IProviderObservable <TSource> observable,
Func <ClaimsPrincipal, bool> principalCheck,
object error) =>
observable.CurrentUserHas((p, s) => principalCheck(p), s => error);
/// <summary>
/// If the check returns <c>false</c>, <see cref="ValidationException"/>
/// is emitted as an error with the status code 403 (Forbidden).
/// Otherwise the given value is emitted.
/// <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="claimType">The claim type.</param>
/// <param name="claim">The claim.</param>
/// <param name="errorFactory">The error factory method.</param>
/// <returns>An instance of <see cref="IProviderObservable{TSource}"/>.</returns>
public static IProviderObservable <TSource> CurrentUserHasClaim <TSource>(
this IProviderObservable <TSource> observable,
string claimType,
string claim,
Func <TSource, object> errorFactory = null) =>
observable.CurrentUserHas((p, s) => p.HasClaim(claimType, claim), errorFactory);
/// <summary>
/// If the check returns <c>false</c>, <see cref="ValidationException"/>
/// is emitted as an error with the status code 403 (Forbidden).
/// Otherwise the given value is emitted.
/// <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="principalCheck">The principal check function.</param>
/// <param name="errorFactory">The error factory method.</param>
/// <returns>An instance of <see cref="IProviderObservable{TSource}"/>.</returns>
public static IProviderObservable <TSource> CurrentUserHas <TSource>(
this IProviderObservable <TSource> observable,
Func <ClaimsPrincipal, bool> principalCheck,
Func <TSource, object> errorFactory = null) =>
observable.CurrentUserHas((p, s) => principalCheck(p), errorFactory);
