private async Task <(string clientId, string redirectUri, OpenIdConnectMessage error)> ValidateClientIdAndRedirectUri(
IDictionary <string, string[]> requestParameters, string state)
{
var(clientId, clientIdError) = RequestParametersHelper.ValidateParameterIsUnique(requestParameters, OpenIdConnectParameterNames.ClientId, _errorProvider);
if (clientIdError != null)
{
clientIdError.State = state;
return(null, null, clientIdError);
}
if (!await _clientIdValidator.ValidateClientIdAsync(clientId))
{
clientIdError = _errorProvider.InvalidClientId(clientId);
clientIdError.State = state;
return(null, null, clientIdError);
}
var(redirectUri, redirectUriError) = RequestParametersHelper.ValidateOptionalParameterIsUnique(requestParameters, OpenIdConnectParameterNames.RedirectUri, _errorProvider);
if (redirectUriError != null)
{
redirectUriError.State = state;
return(null, null, redirectUriError);
}
if (redirectUri != null)
{
if (!Uri.IsWellFormedUriString(redirectUri, UriKind.Absolute))
{
redirectUriError = _errorProvider.InvalidUriFormat(redirectUri);
redirectUriError.State = state;
return(null, null, redirectUriError);
}
var parsedUri = new Uri(redirectUri, UriKind.Absolute);
if (!string.IsNullOrEmpty(parsedUri.Fragment))
{
redirectUriError = _errorProvider.InvalidUriFormat(redirectUri);
redirectUriError.State = state;
return(null, null, redirectUriError);
}
}
var resolvedUriResult = await _redirectUrlValidator.ResolveRedirectUriAsync(clientId, redirectUri);
if (!resolvedUriResult.IsValid)
{
resolvedUriResult.Error.State = state;
return(null, null, resolvedUriResult.Error);
}
return(clientId, resolvedUriResult.Uri, null);
}
private async Task <OpenIdConnectMessage> ValidateAuthorizationCode(
IDictionary <string, string[]> requestParameters,
string clientId,
AuthorizationGrant consentGrant)
{
if (!(consentGrant.Token is AuthorizationCode code))
{
throw new InvalidOperationException("Granted token must be an authorization code.");
}
var(redirectUri, redirectUriError) = RequestParametersHelper.ValidateOptionalParameterIsUnique(requestParameters, OpenIdConnectParameterNames.RedirectUri, _errorProvider);
if (redirectUriError != null)
{
return(redirectUriError);
}
var tokenRedirectUri = code.RedirectUri;
if (redirectUri == null && tokenRedirectUri != null)
{
return(_errorProvider.MissingRequiredParameter(OpenIdConnectParameterNames.RedirectUri));
}
if (!string.Equals(redirectUri, tokenRedirectUri, StringComparison.Ordinal))
{
return(_errorProvider.MismatchedRedirectUrl(redirectUri));
}
var resolution = await _redirectUriValidator.ResolveRedirectUriAsync(clientId, redirectUri);
if (!resolution.IsValid)
{
return(_errorProvider.InvalidRedirectUri(redirectUri));
}
if (code.CodeChallenge != null)
{
if (!ProofOfKeyForCodeExchangeChallengeMethods.SHA256.Equals(code.CodeChallengeMethod, StringComparison.Ordinal))
{
throw new InvalidOperationException("Unsupported code challenge method.");
}
var(verifier, verifierError) = RequestParametersHelper.ValidateParameterIsUnique(requestParameters, ProofOfKeyForCodeExchangeParameterNames.CodeVerifier, _errorProvider);
if (verifierError != null)
{
return(verifierError);
}
// code-verifier = [a-zA-Z0-9\-._~]{43,128}
if (verifier.Length < 43 || verifier.Length > 128)
{
return(_errorProvider.InvalidCodeVerifier());
}
for (var i = 0; i < verifier.Length; i++)
{
if (verifier[i] > 127 || !ValidCodeVerifierCharacters[verifier[i]])
{
return(_errorProvider.InvalidCodeVerifier());
}
}
if (!string.Equals(code.CodeChallenge, GetComputedChallenge(verifier), StringComparison.Ordinal))
{
return(_errorProvider.InvalidCodeVerifier());
}
}
return(null);
}
