protected override async Task <AuthenticationTicket> AuthenticateCoreAsync()
{
AuthenticationProperties properties = null;
try
{
string code = null;
string state = null;
IReadableStringCollection query = Request.Query;
IList <string> values = query.GetValues("error");
if (values != null && values.Count >= 1)
{
_logger.WriteVerbose("Remote server returned an error: " + Request.QueryString);
}
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));
}
if (code == null)
{
// Null if the remote server returns an error.
return(new AuthenticationTicket(null, properties));
}
string requestPrefix = Request.Scheme + "://" + Request.Host;
string redirectUri = requestPrefix + Request.PathBase + Options.CallbackPath;
string tokenRequest = "grant_type=authorization_code" +
"&code=" + Uri.EscapeDataString(code) +
"&redirect_uri=" + Uri.EscapeDataString(redirectUri) +
"&client_id=" + Uri.EscapeDataString(Options.AppId) +
"&client_secret=" + Uri.EscapeDataString(Options.AppSecret);
HttpResponseMessage tokenResponse =
await _httpClient.GetAsync(TokenEndpoint + "?" + tokenRequest, Request.CallCancelled);
tokenResponse.EnsureSuccessStatusCode();
string content = await tokenResponse.Content.ReadAsStringAsync();
JObject token = JObject.Parse(content);
string accessToken = token["access_token"].Value <string>();
string expires = token["expires_in"].Value <string>();
// get user info
string graphAddress = UserInfoEndpoint + "?access_token=" + Uri.EscapeDataString(accessToken);
if (Options.SendAppSecretProof)
{
graphAddress += "&appsecret_proof=" + GenerateAppSecretProof(accessToken);
}
HttpResponseMessage graphResponse = await _httpClient.GetAsync(graphAddress, Request.CallCancelled);
graphResponse.EnsureSuccessStatusCode();
content = await graphResponse.Content.ReadAsStringAsync();
JObject user = JObject.Parse(content);
// get permissions
string permissionsAddress = PermissionsEndpoint + "?access_token=" + Uri.EscapeDataString(accessToken);
if (Options.SendAppSecretProof)
{
permissionsAddress += "&appsecret_proof=" + GenerateAppSecretProof(accessToken);
}
HttpResponseMessage permissionsResponse = await _httpClient.GetAsync(permissionsAddress, Request.CallCancelled);
permissionsResponse.EnsureSuccessStatusCode();
content = await permissionsResponse.Content.ReadAsStringAsync();
JObject permissions = JObject.Parse(content);
// parse reponses
var context = new FacebookAuthenticatedContext(Context, user, permissions, accessToken, expires);
context.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.Email))
{
context.Identity.AddClaim(
new Claim(ClaimTypes.Email, context.Email, XmlSchemaString, Options.AuthenticationType));
}
if (!string.IsNullOrEmpty(context.Name))
{
context.Identity.AddClaim(
new Claim("urn:facebook:name", context.Name, XmlSchemaString, Options.AuthenticationType));
// Many Facebook accounts do not set the UserName field. Fall back to the Name field instead.
if (string.IsNullOrEmpty(context.UserName))
{
context.Identity.AddClaim(
new Claim(ClaimsIdentity.DefaultNameClaimType, context.Name, XmlSchemaString, Options.AuthenticationType));
}
}
if (!string.IsNullOrEmpty(context.Link))
{
context.Identity.AddClaim(
new Claim("urn:facebook:link", context.Link, XmlSchemaString, Options.AuthenticationType));
}
context.Properties = properties;
await Options.Provider.Authenticated(context);
return(new AuthenticationTicket(context.Identity, context.Properties));
}
catch (Exception ex)
{
_logger.WriteError("Authentication failed", ex);
return(new AuthenticationTicket(null, properties));
}
}
/// <summary>
/// Invoked whenever Facebook 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(FacebookAuthenticatedContext context)
{
return(OnAuthenticated(context));
}
