protected override async Task <AuthenticationTicket> AuthenticateCoreAsync()
{
AuthenticationProperties properties = null;
try
{
string code = null;
string state = null;
var query = Request.Query;
var values = query.GetValues("code");
if (values != null && values.Count == 1)
{
code = values[0];
}
values = query.GetValues("state");
if (values != null && values.Count == 1)
{
state = values[0];
}
properties = Options.StateDataFormat.Unprotect(state);
if (properties == null)
{
return(null);
}
// OAuth2 10.12 CSRF
if (!ValidateCorrelationId(properties, _logger))
{
return(new AuthenticationTicket(null, properties));
}
var requestPrefix = Request.Scheme + "://" + Request.Host;
var redirectUri = requestPrefix + Request.PathBase + Options.CallbackPath;
// Build up the body for the token request
var body = new List <KeyValuePair <string, string> >
{
new KeyValuePair <string, string>("code", code),
new KeyValuePair <string, string>("redirect_uri", redirectUri),
new KeyValuePair <string, string>("client_id", Options.ClientId),
new KeyValuePair <string, string>("client_secret", Options.ClientSecret)
};
// Request the token
var tokenResponse =
await _httpClient.PostAsync(TokenEndpoint, new FormUrlEncodedContent(body));
tokenResponse.EnsureSuccessStatusCode();
var text = await tokenResponse.Content.ReadAsStringAsync();
// Deserializes the token response
//dynamic response = JsonConvert.DeserializeObject<dynamic>(text);
var responseTokens = HttpUtility.ParseQueryString(text);
var accessToken = responseTokens["access_token"];
var expires = responseTokens["expires"];
// Get the StackExchange user
var userRequest = new HttpRequestMessage(HttpMethod.Get, UserInfoEndpoint + "&access_token=" + Uri.EscapeDataString(accessToken) + "&key=" + Uri.EscapeDataString(Options.Key));
var graphResponse = await _httpClient.SendAsync(userRequest, Request.CallCancelled);
graphResponse.EnsureSuccessStatusCode();
//According to http://api.stackexchange.com/docs/compression -
//Responses would always be compressed
//If Accept-Encoding request header is not set, compression would be GZIP
//If Content-Encoding is not specified in response header, assume GZIP
using (var stream = new GZipStream(await graphResponse.Content.ReadAsStreamAsync(), CompressionMode.Decompress))
{
var sr = new StreamReader(stream);
text = sr.ReadToEnd();
}
var userResponse = JObject.Parse(text);
JToken userAccounts;
var user = userResponse.TryGetValue("items", out userAccounts)
? userAccounts.First as JObject
: null;
var context = new StackExchangeAuthenticatedContext(Context, user, accessToken, expires)
{
Identity = new ClaimsIdentity(
Options.AuthenticationType,
ClaimsIdentity.DefaultNameClaimType,
ClaimsIdentity.DefaultRoleClaimType)
};
if (!string.IsNullOrEmpty(context.Id))
{
context.Identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, context.Id, XmlSchemaString, Options.AuthenticationType));
}
if (!string.IsNullOrEmpty(context.UserName))
{
context.Identity.AddClaim(new Claim(ClaimsIdentity.DefaultNameClaimType, context.UserName, XmlSchemaString, Options.AuthenticationType));
}
if (!string.IsNullOrEmpty(context.Name))
{
context.Identity.AddClaim(new Claim("urn:stackexchange:name", context.Name, XmlSchemaString, Options.AuthenticationType));
}
if (!string.IsNullOrEmpty(context.Link))
{
context.Identity.AddClaim(new Claim("urn:stackexchange:url", context.Link, XmlSchemaString, Options.AuthenticationType));
}
if (!string.IsNullOrEmpty(context.AccessToken))
{
context.Identity.AddClaim(new Claim("urn:stackexchange:accesstoken", context.AccessToken, XmlSchemaString, Options.AuthenticationType));
}
if (!string.IsNullOrEmpty(context.ProfileImage))
{
context.Identity.AddClaim(new Claim("urn:stackexchange:profileimage", context.ProfileImage, XmlSchemaString, Options.AuthenticationType));
}
context.Properties = properties;
await Options.Provider.Authenticated(context);
return(new AuthenticationTicket(context.Identity, context.Properties));
}
catch (Exception ex)
{
_logger.WriteError(ex.Message);
}
return(new AuthenticationTicket(null, properties));
}
/// <summary>
/// Invoked whenever StackExchange successfully authenticates a user
/// </summary>
/// <param name="context">Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.</param>
/// <returns>A <see cref="Task"/> representing the completed operation.</returns>
public virtual Task Authenticated(StackExchangeAuthenticatedContext context)
{
return(OnAuthenticated(context));
}
/// <summary>
/// Invoked whenever StackExchange successfully authenticates a user
/// </summary>
/// <param name="context">Contains information about the login session as well as the user <see cref="System.Security.Claims.ClaimsIdentity"/>.</param>
/// <returns>A <see cref="Task"/> representing the completed operation.</returns>
public virtual Task Authenticated(StackExchangeAuthenticatedContext context)
{
return OnAuthenticated(context);
}
public Task ReturnEndpoint(StackExchangeAuthenticatedContext context)
{
return Task.FromResult<object>(null);
}
public override Task Authenticated(StackExchangeAuthenticatedContext context)
{
context.Identity.AddClaim(new Claim("ExternalAccessToken", context.AccessToken));
return Task.FromResult<object>(null);
}
public void ApplyRedirect(StackExchangeAuthenticatedContext context)
{
context.Response.Redirect(context.Properties.RedirectUri);
}