/// <summary>
/// Called before the AuthorizationEndpoint redirects its response to the caller. The response could be the
/// token, when using implicit flow or the AuthorizationEndpoint when using authorization code flow.
/// An application may implement this call in order to do any final modification of the claims being used
/// to issue access or refresh tokens. This call may also be used in order to add additional
/// response parameters to the authorization endpoint's response.
/// </summary>
/// <param name="context">The context of the event carries information in and results out.</param>
/// <returns>Task to enable asynchronous execution</returns>
public virtual Task AuthorizationEndpointResponse(OAuthAuthorizationEndpointResponseContext context)
{
return(OnAuthorizationEndpointResponse.Invoke(context));
}
protected override async Task ApplyResponseGrantAsync()
{
// only successful results of an authorize request are altered
if (_clientContext == null ||
_authorizeEndpointRequest == null ||
Response.StatusCode != 200)
{
return;
}
// only apply with signin of matching authentication type
AuthenticationResponseGrant signin = Helper.LookupSignIn(Options.AuthenticationType);
if (signin == null)
{
return;
}
var returnParameter = new Dictionary <string, string>();
if (_authorizeEndpointRequest.IsAuthorizationCodeGrantType)
{
DateTimeOffset currentUtc = Options.SystemClock.UtcNow;
signin.Properties.IssuedUtc = currentUtc;
signin.Properties.ExpiresUtc = currentUtc.Add(Options.AuthorizationCodeExpireTimeSpan);
// associate client_id with all subsequent tickets
signin.Properties.Dictionary[Constants.Extra.ClientId] = _authorizeEndpointRequest.ClientId;
if (!string.IsNullOrEmpty(_authorizeEndpointRequest.RedirectUri))
{
// keep original request parameter for later comparison
signin.Properties.Dictionary[Constants.Extra.RedirectUri] = _authorizeEndpointRequest.RedirectUri;
}
var context = new AuthenticationTokenCreateContext(
Context,
Options.AuthorizationCodeFormat,
new AuthenticationTicket(signin.Identity, signin.Properties));
await Options.AuthorizationCodeProvider.CreateAsync(context);
string code = context.Token;
if (string.IsNullOrEmpty(code))
{
_logger.WriteError("response_type code requires an Options.AuthorizationCodeProvider implementing a single-use token.");
var errorContext = new OAuthValidateAuthorizeRequestContext(Context, Options, _authorizeEndpointRequest, _clientContext);
errorContext.SetError(Constants.Errors.UnsupportedResponseType);
await SendErrorRedirectAsync(_clientContext, errorContext);
return;
}
var authResponseContext = new OAuthAuthorizationEndpointResponseContext(
Context,
Options,
new AuthenticationTicket(signin.Identity, signin.Properties),
_authorizeEndpointRequest,
null,
code);
await Options.Provider.AuthorizationEndpointResponse(authResponseContext);
foreach (var parameter in authResponseContext.AdditionalResponseParameters)
{
returnParameter[parameter.Key] = parameter.Value.ToString();
}
returnParameter[Constants.Parameters.Code] = code;
if (!String.IsNullOrEmpty(_authorizeEndpointRequest.State))
{
returnParameter[Constants.Parameters.State] = _authorizeEndpointRequest.State;
}
string location = string.Empty;
if (_authorizeEndpointRequest.IsFormPostResponseMode)
{
location = Options.FormPostEndpoint.ToString();
returnParameter[Constants.Parameters.RedirectUri] = _clientContext.RedirectUri;
}
else
{
location = _clientContext.RedirectUri;
}
foreach (var key in returnParameter.Keys)
{
location = WebUtilities.AddQueryString(location, key, returnParameter[key]);
}
Response.Redirect(location);
}
else if (_authorizeEndpointRequest.IsImplicitGrantType)
{
string location = _clientContext.RedirectUri;
DateTimeOffset currentUtc = Options.SystemClock.UtcNow;
signin.Properties.IssuedUtc = currentUtc;
signin.Properties.ExpiresUtc = currentUtc.Add(Options.AccessTokenExpireTimeSpan);
// associate client_id with access token
signin.Properties.Dictionary[Constants.Extra.ClientId] = _authorizeEndpointRequest.ClientId;
var accessTokenContext = new AuthenticationTokenCreateContext(
Context,
Options.AccessTokenFormat,
new AuthenticationTicket(signin.Identity, signin.Properties));
await Options.AccessTokenProvider.CreateAsync(accessTokenContext);
string accessToken = accessTokenContext.Token;
if (string.IsNullOrEmpty(accessToken))
{
accessToken = accessTokenContext.SerializeTicket();
}
DateTimeOffset?accessTokenExpiresUtc = accessTokenContext.Ticket.Properties.ExpiresUtc;
var appender = new Appender(location, '#');
appender
.Append(Constants.Parameters.AccessToken, accessToken)
.Append(Constants.Parameters.TokenType, Constants.TokenTypes.Bearer);
if (accessTokenExpiresUtc.HasValue)
{
TimeSpan?expiresTimeSpan = accessTokenExpiresUtc - currentUtc;
var expiresIn = (long)(expiresTimeSpan.Value.TotalSeconds + .5);
appender.Append(Constants.Parameters.ExpiresIn, expiresIn.ToString(CultureInfo.InvariantCulture));
}
if (!String.IsNullOrEmpty(_authorizeEndpointRequest.State))
{
appender.Append(Constants.Parameters.State, _authorizeEndpointRequest.State);
}
var authResponseContext = new OAuthAuthorizationEndpointResponseContext(
Context,
Options,
new AuthenticationTicket(signin.Identity, signin.Properties),
_authorizeEndpointRequest,
accessToken,
null);
await Options.Provider.AuthorizationEndpointResponse(authResponseContext);
foreach (var parameter in authResponseContext.AdditionalResponseParameters)
{
appender.Append(parameter.Key, parameter.Value.ToString());
}
Response.Redirect(appender.ToString());
}
}
