private async Task InvokeTokenEndpointAsync()
{
DateTimeOffset currentUtc = Options.SystemClock.UtcNow;
// remove milliseconds in case they don't round-trip
currentUtc = currentUtc.Subtract(TimeSpan.FromMilliseconds(currentUtc.Millisecond));
IFormCollection form = await Request.ReadFormAsync();
var clientContext = new OAuthValidateClientAuthenticationContext(
Context,
Options,
form);
await Options.Provider.ValidateClientAuthenticationAsync(clientContext);
if (!clientContext.IsValidated)
{
_logger.WriteError("clientID is not valid.");
if (!clientContext.HasError)
{
clientContext.SetError(Constants.Errors.InvalidClient);
}
await SendErrorAsJsonAsync(clientContext);
return;
}
var tokenEndpointRequest = new TokenEndpointRequest(form);
var validatingContext = new OAuthValidateTokenRequestContext(Context, Options, tokenEndpointRequest, clientContext);
AuthenticationTicket ticket = null;
if (tokenEndpointRequest.IsAuthorizationCodeGrantType)
{
// Authorization Code Grant http://tools.ietf.org/html/rfc6749#section-4.1
// Access Token Request http://tools.ietf.org/html/rfc6749#section-4.1.3
ticket = await InvokeTokenEndpointAuthorizationCodeGrantAsync(validatingContext, currentUtc);
}
else if (tokenEndpointRequest.IsResourceOwnerPasswordCredentialsGrantType)
{
// Resource Owner Password Credentials Grant http://tools.ietf.org/html/rfc6749#section-4.3
// Access Token Request http://tools.ietf.org/html/rfc6749#section-4.3.2
ticket = await InvokeTokenEndpointResourceOwnerPasswordCredentialsGrantAsync(validatingContext, currentUtc);
}
else if (tokenEndpointRequest.IsClientCredentialsGrantType)
{
// Client Credentials Grant http://tools.ietf.org/html/rfc6749#section-4.4
// Access Token Request http://tools.ietf.org/html/rfc6749#section-4.4.2
ticket = await InvokeTokenEndpointClientCredentialsGrantAsync(validatingContext, currentUtc);
}
else if (tokenEndpointRequest.IsRefreshTokenGrantType)
{
// Refreshing an Access Token
// http://tools.ietf.org/html/rfc6749#section-6
ticket = await InvokeTokenEndpointRefreshTokenGrantAsync(validatingContext, currentUtc);
}
else if (tokenEndpointRequest.IsCustomExtensionGrantType)
{
// Defining New Authorization Grant Types
// http://tools.ietf.org/html/rfc6749#section-8.3
ticket = await InvokeTokenEndpointCustomGrantAsync(validatingContext, currentUtc);
}
else
{
// Error Response http://tools.ietf.org/html/rfc6749#section-5.2
// The authorization grant type is not supported by the
// authorization server.
_logger.WriteError("grant type is not recognized");
validatingContext.SetError(Constants.Errors.UnsupportedGrantType);
}
if (ticket == null)
{
await SendErrorAsJsonAsync(validatingContext);
return;
}
ticket.Properties.IssuedUtc = currentUtc;
ticket.Properties.ExpiresUtc = currentUtc.Add(Options.AccessTokenExpireTimeSpan);
var tokenEndpointContext = new OAuthTokenEndpointContext(
Context,
Options,
ticket,
tokenEndpointRequest);
await Options.Provider.TokenEndpoint(tokenEndpointContext);
if (tokenEndpointContext.TokenIssued)
{
ticket = new AuthenticationTicket(
tokenEndpointContext.Identity,
tokenEndpointContext.Properties);
}
else
{
_logger.WriteError("Token was not issued to tokenEndpointContext");
validatingContext.SetError(Constants.Errors.InvalidGrant);
await SendErrorAsJsonAsync(validatingContext);
return;
}
var accessTokenContext = new AuthenticationTokenCreateContext(
Context,
Options.AccessTokenFormat,
ticket);
await Options.AccessTokenProvider.CreateAsync(accessTokenContext);
string accessToken = accessTokenContext.Token;
if (string.IsNullOrEmpty(accessToken))
{
accessToken = accessTokenContext.SerializeTicket();
}
DateTimeOffset?accessTokenExpiresUtc = ticket.Properties.ExpiresUtc;
var refreshTokenCreateContext = new AuthenticationTokenCreateContext(
Context,
Options.RefreshTokenFormat,
accessTokenContext.Ticket);
await Options.RefreshTokenProvider.CreateAsync(refreshTokenCreateContext);
string refreshToken = refreshTokenCreateContext.Token;
var tokenEndpointResponseContext = new OAuthTokenEndpointResponseContext(
Context,
Options,
ticket,
tokenEndpointRequest,
accessToken,
tokenEndpointContext.AdditionalResponseParameters);
await Options.Provider.TokenEndpointResponse(tokenEndpointResponseContext);
var memory = new MemoryStream();
byte[] body;
using (var writer = new JsonTextWriter(new StreamWriter(memory)))
{
writer.WriteStartObject();
writer.WritePropertyName(Constants.Parameters.AccessToken);
writer.WriteValue(accessToken);
writer.WritePropertyName(Constants.Parameters.TokenType);
writer.WriteValue(Constants.TokenTypes.Bearer);
if (accessTokenExpiresUtc.HasValue)
{
TimeSpan?expiresTimeSpan = accessTokenExpiresUtc - currentUtc;
var expiresIn = (long)expiresTimeSpan.Value.TotalSeconds;
if (expiresIn > 0)
{
writer.WritePropertyName(Constants.Parameters.ExpiresIn);
writer.WriteValue(expiresIn);
}
}
if (!String.IsNullOrEmpty(refreshToken))
{
writer.WritePropertyName(Constants.Parameters.RefreshToken);
writer.WriteValue(refreshToken);
}
foreach (var additionalResponseParameter in tokenEndpointResponseContext.AdditionalResponseParameters)
{
writer.WritePropertyName(additionalResponseParameter.Key);
writer.WriteValue(additionalResponseParameter.Value);
}
writer.WriteEndObject();
writer.Flush();
body = memory.ToArray();
}
Response.ContentType = "application/json;charset=UTF-8";
Response.Headers.Set("Cache-Control", "no-cache");
Response.Headers.Set("Pragma", "no-cache");
Response.Headers.Set("Expires", "-1");
Response.ContentLength = body.Length;
await Response.WriteAsync(body, Request.CallCancelled);
}
/// <summary>
/// Called at the final stage of a successful Token endpoint request. 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 Token endpoint's json response body.
/// </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 TokenEndpoint(OAuthTokenEndpointContext context)
{
return(OnTokenEndpoint.Invoke(context));
}
