private async Task <AuthenticationTicket> InvokeTokenEndpointAuthorizationCodeGrantAsync(OAuthValidateTokenRequestContext validatingContext, DateTimeOffset currentUtc)
{
TokenEndpointRequest tokenEndpointRequest = validatingContext.TokenRequest;
var authorizationCodeContext = new AuthenticationTokenReceiveContext(Context, Options.AuthorizationCodeFormat, tokenEndpointRequest.AuthorizationCodeGrant.Code);
await Options.AuthorizationCodeProvider.ReceiveAsync(authorizationCodeContext);
AuthenticationTicket ticket = authorizationCodeContext.Ticket;
if (ticket == null)
{
Logger.LogError("invalid authorization code");
validatingContext.SetError(Constants.Errors.InvalidGrant);
return(null);
}
if (!ticket.Properties.ExpiresUtc.HasValue ||
ticket.Properties.ExpiresUtc < currentUtc)
{
Logger.LogError("expired authorization code");
validatingContext.SetError(Constants.Errors.InvalidGrant);
return(null);
}
string clientId;
if (!ticket.Properties.Items.TryGetValue(Constants.Extra.ClientId, out clientId) ||
!string.Equals(clientId, validatingContext.ClientContext.ClientId, StringComparison.Ordinal))
{
Logger.LogError("authorization code does not contain matching client_id");
validatingContext.SetError(Constants.Errors.InvalidGrant);
return(null);
}
string redirectUri;
if (ticket.Properties.Items.TryGetValue(Constants.Extra.RedirectUri, out redirectUri))
{
ticket.Properties.Items.Remove(Constants.Extra.RedirectUri);
if (!string.Equals(redirectUri, tokenEndpointRequest.AuthorizationCodeGrant.RedirectUri, StringComparison.Ordinal))
{
Logger.LogError("authorization code does not contain matching redirect_uri");
validatingContext.SetError(Constants.Errors.InvalidGrant);
return(null);
}
}
await Options.Provider.ValidateTokenRequest(validatingContext);
var grantContext = new OAuthGrantAuthorizationCodeContext(
Context, Options, ticket);
if (validatingContext.IsValidated)
{
await Options.Provider.GrantAuthorizationCode(grantContext);
}
return(ReturnOutcome(validatingContext, grantContext, grantContext.Ticket, Constants.Errors.InvalidGrant));
}
private async Task <AuthenticationTicket> InvokeTokenEndpointRefreshTokenGrantAsync(OAuthValidateTokenRequestContext validatingContext, DateTimeOffset currentUtc)
{
TokenEndpointRequest tokenEndpointRequest = validatingContext.TokenRequest;
var refreshTokenContext = new AuthenticationTokenReceiveContext(Context, Options.RefreshTokenFormat, tokenEndpointRequest.RefreshTokenGrant.RefreshToken);
await Options.RefreshTokenProvider.ReceiveAsync(refreshTokenContext);
AuthenticationTicket ticket = refreshTokenContext.Ticket;
if (ticket == null)
{
Logger.LogError("invalid refresh token");
validatingContext.SetError(Constants.Errors.InvalidGrant);
return(null);
}
if (!ticket.Properties.ExpiresUtc.HasValue || ticket.Properties.ExpiresUtc < currentUtc)
{
Logger.LogError("expired refresh token");
validatingContext.SetError(Constants.Errors.InvalidGrant);
return(null);
}
await Options.Provider.ValidateTokenRequest(validatingContext);
var grantContext = new OAuthGrantRefreshTokenContext(Context, Options, ticket, validatingContext.ClientContext.ClientId);
if (validatingContext.IsValidated)
{
await Options.Provider.GrantRefreshToken(grantContext);
}
return(ReturnOutcome(validatingContext, grantContext, grantContext.Ticket, Constants.Errors.InvalidGrant));
}
private static AuthenticationTicket ReturnOutcome(OAuthValidateTokenRequestContext validatingContext, BaseValidatingContext <OAuthAuthorizationServerOptions> grantContext, AuthenticationTicket ticket, string defaultError)
{
if (!validatingContext.IsValidated)
{
return(null);
}
if (!grantContext.IsValidated)
{
if (grantContext.HasError)
{
validatingContext.SetError(grantContext.Error, grantContext.ErrorDescription, grantContext.ErrorUri);
}
else
{
validatingContext.SetError(defaultError);
}
return(null);
}
if (ticket == null)
{
validatingContext.SetError(defaultError);
return(null);
}
return(ticket);
}
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);
}