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.ValidateClientAuthentication(clientContext);
if (!clientContext.IsValidated)
{
Logger.LogError("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.LogError("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.Principal, tokenEndpointContext.Properties, tokenEndpointContext.Options.AuthenticationScheme);
}
else
{
Logger.LogError("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);
MemoryStream stream, memoryStream = null;
string body;
try
{
stream = memoryStream = new MemoryStream();
using (var writer = new JsonTextWriter(new StreamWriter(memoryStream)))
{
memoryStream = null;
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 = Encoding.UTF8.GetString(stream.ToArray());
Response.ContentType = "application/json;charset=UTF-8";
Response.Headers["Cache-Control"] = "no-cache";
Response.Headers["Pragma"] = "no-cache";
Response.Headers["Expires"] = "-1";
Response.ContentLength = Encoding.UTF8.GetByteCount(body);
}
}
finally
{
if (memoryStream != null)
{
memoryStream.Dispose();
}
}
await Response.WriteAsync(body, Encoding.UTF8, Context.RequestAborted);
}
/// <summary>
/// Called before the TokenEndpoint redirects its response to the caller.
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public virtual Task TokenEndpointResponse(OAuthTokenEndpointResponseContext context)
{
return OnTokenEndpointResponse.Invoke(context);
}
/// <summary>
/// Called before the TokenEndpoint redirects its response to the caller.
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public virtual Task TokenEndpointResponse(OAuthTokenEndpointResponseContext context)
{
return(OnTokenEndpointResponse.Invoke(context));
}