public async Task <SteamOpenIdState> LinkWithSteamTaskAsync(ulong discordUserId)
{
var a = Guid.NewGuid();
var state = new SteamOpenIdState
{
ReturnTo = new Uri(new Uri(_options.RedirectUri), $"?a={a}"),
Identity = @"http://specs.openid.net/auth/2.0/identifier_select",
ClaimedId = @"http://specs.openid.net/auth/2.0/identifier_select",
Authority = _authority,
DiscordUserId = discordUserId,
};
if (!_states.TryAdd(a, state))
{
return(null);
}
//&openid.realm={state.Realm}
var uri = new Uri(new Uri(await _endpoint), $@"?openid.ns=http://specs.openid.net/auth/2.0&openid.mode=checkid_setup&openid.return_to={state.ReturnTo}&openid.claimed_id={state.ClaimedId}&openid.identity={state.Identity}");
state.StartUrl = uri.ToString();
return(state);
}
private async Task HandleRequestAsync(HttpListenerContext context)
{
var successful = false;
ulong steamId = 0;
SteamOpenIdState state = null;
try
{
var request = context.Request;
var qs = request.QueryString;
Guid a;
if (!Guid.TryParse(qs["a"] ?? "", out a))
{
//request failed
return;
}
if (!_states.TryRemove(a, out state))
{
//failed to get state
return;
}
var query = UriExtensions.ParseQueryString(state.ReturnTo);
if (request.Url.Scheme != state.ReturnTo.Scheme ||
request.Url.Authority != state.ReturnTo.Authority ||
request.Url.AbsolutePath != state.ReturnTo.AbsolutePath ||
query.AllKeys.Any(x => qs[x] == null || qs[x].Equals(query[x], StringComparison.Ordinal) == false) ||
qs["openid.mode"]?.Equals("id_res") != true ||
qs["openid.claimed_id"]?.StartsWith(state.Authority) != true)
{
//assertions failed
return;
}
var r = new Regex(@"/openid/id/(?<steamid>\d+)$", RegexOptions.IgnoreCase | RegexOptions.Singleline);
var m = r.Match(qs["openid.claimed_id"]);
if (!m.Success)
{
//failed to get steamid
return;
}
if (!ulong.TryParse(m.Groups["steamid"].Value, NumberStyles.None, CultureInfo.InvariantCulture, out steamId))
{
return;
}
successful = true;
//openid/
//?openid.ns=http%3A%2F%2Fspecs.openid.net%2Fauth%2F2.0
//&openid.mode=id_res
//&openid.op_endpoint=https%3A%2F%2Fsteamcommunity.com%2Fopenid%2Flogin
//&openid.claimed_id=http%3A%2F%2Fsteamcommunity.com%2Fopenid%2Fid%2F76561198005371608
//&openid.identity=http%3A%2F%2Fsteamcommunity.com%2Fopenid%2Fid%2F76561198005371608
//&openid.return_to=http%3A%2F%2F62.63.229.45%3A7331%2Fopenid%2F
//&openid.response_nonce=2017-02-05T18%3A20%3A46ZwFvmnCumgCkT9IWOoIDpaJLc6%2Bs%3D
//&openid.assoc_handle=1234567890
//&openid.signed=signed%2Cop_endpoint%2Cclaimed_id%2Cidentity%2Creturn_to%2Cresponse_nonce%2Cassoc_handle
//&openid.sig=Cpo83xgHcMqzVOyQqe693s%2FRQO4%3D
}
finally
{
Task task;
_ongoingTasks.TryRemove(context.Request.RequestTraceIdentifier, out task);
if (state != null)
{
OnSteamOpenIdCallback(successful, steamId, state.DiscordUserId);
if (_getHtmlContent != null)
{
var content = await _getHtmlContent(successful, steamId, state.DiscordUserId);
var buffer = Encoding.UTF8.GetBytes(content);
context.Response.ContentLength64 = buffer.Length;
await context.Response.OutputStream.WriteAsync(buffer, 0, buffer.Length);
context.Response.OutputStream.Close();
}
}
}
}