public static string SignUrl(Action <TokenConfig> configFunc)
{
var config = new TokenConfig();
configFunc(config);
TokenConfigValidator.EnsureValid(config);
var url = AddCountrySettings(config, new Url(config.Url));
var signaturePath = GetSignaturePath(config, url);
var expires = config.ExpiresAt.ToUnixTimestamp();;
var hashableBase = $"{config.SecurityKey}{signaturePath}{expires}{config.UserIp}{url.Query}";
var token = ReplaceChars(GetBase64EncodedHash(hashableBase));
// Overwrite the token_path to urlencode it for the final url
url.SetQueryParam("token_path", config.TokenPath);
// Add expires
url.SetQueryParam("expires", expires);
if (config.IsDirectory)
{
return(url.Root + "/bcdn_token=" + token + "&" + url.Query + url.Path);
}
else
{
return(url.Root + url.Path + "?token=" + token + "&" + url.Query);
}
}
private static string GetSignaturePath(TokenConfig config, Url url)
{
if (config.HasTokenPath)
{
url.SetQueryParam("token_path", config.TokenPath, true);
return(config.TokenPath);
}
else
{
return(url.Path);
}
}
private static Url AddCountrySettings(TokenConfig config, Url url)
{
if (config.CountriesAllowed.Any())
{
url.SetQueryParam("token_countries", string.Join(",", config.CountriesAllowed).ToUpperInvariant(), true);
}
if (config.CountriesBlocked.Any())
{
url.SetQueryParam("token_countries_blocked", string.Join(",", config.CountriesBlocked).ToUpperInvariant(), true);
}
return(url);
}
internal static void EnsureValid(TokenConfig config)
{
if (string.IsNullOrEmpty(config.SecurityKey))
{
throw new ArgumentNullException(nameof(config.SecurityKey), "Please set SecurityKey");
}
if (!config.HasExpiresAt)
{
throw new ArgumentNullException(nameof(config), "Please set ExpiresAt");
}
if (config.CountriesBlocked.Intersect(config.CountriesAllowed).Any())
{
throw new ArgumentException("There are country(s) in BOTH the allowed and blocked country lists.");
}
}
