/// <summary>
/// Retrieves the issuer name of an IClaimsIdentity.
/// The algorithm checks the name claim first, and if no name is found, the first claim.
/// </summary>
/// <param name="identity">The identity.</param>
/// <returns>The issuer name</returns>
public static string GetIssuerName(this IClaimsIdentity identity)
{
Contract.Requires(identity != null);
Contract.Requires(identity.Claims != null);
Contract.Ensures(Contract.Result <string>() != null);
// first try the name claim
var claim = identity.FindClaims(WSIdentityConstants.ClaimTypes.Name).FirstOrDefault();
if (claim != null)
{
if (claim.Issuer != null)
{
return(claim.Issuer);
}
}
// then try the first claim
if (identity.Claims.Count > 0)
{
claim = identity.Claims[0];
if (claim != null)
{
if (claim.Issuer != null)
{
return(claim.Issuer);
}
}
}
// empty or exception?
return("");
}
public static IEnumerable <Claim> FindClaims(this IClaimsIdentity identity, string claimType)
{
Contract.Requires(identity != null);
Contract.Requires(identity.Claims != null);
Contract.Requires(!String.IsNullOrEmpty(claimType));
Contract.Ensures(Contract.Result <IEnumerable <Claim> >() != null);
return(identity.FindClaims(c =>
c.ClaimType.Equals(claimType, StringComparison.OrdinalIgnoreCase)));
}
/// <summary>
/// Checks whether a given claim exists
/// </summary>
/// <param name="identity">The identity.</param>
/// <param name="predicate">The search predicate.</param>
/// <returns>true/false</returns>
public static bool ClaimExists(this IClaimsIdentity identity, Predicate <Claim> predicate)
{
Contract.Requires(identity != null);
Contract.Requires(identity.Claims != null);
Contract.Requires(predicate != null);
Claim claim = identity.FindClaims(predicate).FirstOrDefault();
return(claim != null);
}
public static IEnumerable <Claim> FindClaims(this IClaimsIdentity identity, Claim claim)
{
Contract.Requires(identity != null);
Contract.Requires(identity.Claims != null);
Contract.Requires(claim != null);
Contract.Ensures(Contract.Result <IEnumerable <Claim> >() != null);
return(identity.FindClaims(c =>
c.ClaimType.Equals(claim.ClaimType, StringComparison.OrdinalIgnoreCase) &&
c.Value.Equals(claim.Value, StringComparison.OrdinalIgnoreCase) &&
c.Issuer.Equals(claim.Issuer, StringComparison.OrdinalIgnoreCase)));
}
/// <summary>
/// Tries to retrieve the value of a claim.
/// </summary>
/// <param name="identity">The identity.</param>
/// <param name="claimType">Type of the claim.</param>
/// <param name="claimValue">The claim value.</param>
/// <returns>The value</returns>
public static bool TryGetClaimValue(this IClaimsIdentity identity, string claimType, out string claimValue)
{
Contract.Requires(identity != null);
Contract.Requires(identity.Claims != null);
Contract.Requires(identity.Claims != null);
Contract.Requires(!String.IsNullOrEmpty(claimType));
claimValue = null;
Claim claim = identity.FindClaims(claimType).FirstOrDefault();
if (claim != null)
{
claimValue = claim.Value;
return(true);
}
return(false);
}
