public IEnumerable<Claim> Filter(IdentityProvider provider, IEnumerable<Claim> claims)
{
claims = NormalizeExternalClaimTypes(claims);
claims = TransformSocialClaims(provider, claims);
return claims;
}
protected virtual IEnumerable<Claim> TransformSocialClaims(IdentityProvider provider, IEnumerable<Claim> claims)
{
if (provider.Name == FacebookProviderName)
{
claims = TransformFacebookClaims(claims);
}
else if (provider.Name == TwitterProviderName)
{
claims = TransformTwitterClaims(claims);
}
return claims;
}
ExternalIdentity GetExternalIdentity(IEnumerable<Claim> claims)
{
if (claims == null || !claims.Any())
{
return null;
}
var subClaim = claims.FirstOrDefault(x => x.Type == Constants.ClaimTypes.Subject);
if (subClaim == null)
{
subClaim = claims.FirstOrDefault(x => x.Type == ClaimTypes.NameIdentifier);
if (subClaim == null)
{
return null;
}
}
claims = claims.Except(new Claim[] { subClaim });
var idp = new IdentityProvider { Name = subClaim.Issuer };
if (this.externalClaimsFilter != null)
{
claims = externalClaimsFilter.Filter(idp, claims);
}
claims = claims ?? Enumerable.Empty<Claim>();
return new ExternalIdentity
{
Provider = idp,
ProviderId = subClaim.Value,
Claims = claims
};
}
