protected virtual async Task <SteamWebAccessRequest> ConstructLoginRequest(LoginCredentials credentials)
{
// Get a RSA public key for password encryption
var serverResponse = await SteamWebAccess.FetchString(
new SteamWebAccessRequest(
WebLoginRSAUrl,
SteamWebAccessRequestMethod.Post,
new QueryStringBuilder
{
{ "donotcache", (DateTime.UtcNow - Epoch).TotalMilliseconds },
{ "username", credentials.UserName }
}
)
).ConfigureAwait(false);
if (string.IsNullOrWhiteSpace(serverResponse) ||
serverResponse.Contains("<BODY>\nAn error occurred while processing your request."))
{
throw new UserLoginException(UserLoginErrorCode.GeneralFailure, this);
}
var rsaResponse = JsonConvert.DeserializeObject <RSAResponse>(serverResponse);
if (rsaResponse?.Success != true)
{
throw new UserLoginException(UserLoginErrorCode.BadRSAResponse, this);
}
// Sleep for a bit to give Steam a chance to catch up??
await Task.Delay(350).ConfigureAwait(false);
string encryptedPassword;
using (var rsaEncrypt = new RSACryptoServiceProvider())
{
rsaEncrypt.ImportParameters(new RSAParameters
{
Exponent = HexStringToByteArray(rsaResponse.Exponent),
Modulus = HexStringToByteArray(rsaResponse.Modulus)
});
encryptedPassword =
Convert.ToBase64String(
rsaEncrypt.Encrypt(
Encoding.UTF8.GetBytes(credentials.Password)
, false)
);
}
return(new SteamWebAccessRequest(
WebLoginUrl,
SteamWebAccessRequestMethod.Post,
new QueryStringBuilder
{
{ "donotcache", (DateTime.UtcNow - Epoch).TotalMilliseconds },
{ "rsatimestamp", rsaResponse.Timestamp },
{ "password", encryptedPassword },
{ "username", credentials.UserName },
{ "twofactorcode", credentials.TwoFactorAuthenticationCode ?? "" },
{ "emailauth", RequiresEmailVerification ? (credentials.EmailVerificationCode ?? "") : "" },
{ "loginfriendlyname", "" },
{ "captchagid", RequiresCaptchaCode ? (CaptchaGID ?? "-1") : "-1" },
{ "captcha_text", RequiresCaptchaCode ? (credentials.CaptchaCode ?? "") : "" },
{
"emailsteamid",
RequiresTwoFactorAuthenticationCode || RequiresEmailVerification
? (SteamId?.ToString() ?? "")
: ""
},
{ "rsatimestamp", rsaResponse.Timestamp },
{ "remember_login", "true" }
}
));
}