/// <summary>
/// Initializes a MultiProxy instance that lazily parses a given WinHTTP configuration string.
/// </summary>
/// <param name="proxyConfig">The WinHTTP proxy config to parse.</param>
/// <param name="secure">If true, return proxies suitable for use with a secure connection. If false, return proxies suitable for an insecure connection.</param>
public static MultiProxy CreateLazy(FailedProxyCache failedProxyCache, string proxyConfig, bool secure)
{
Debug.Assert(failedProxyCache != null);
return(string.IsNullOrEmpty(proxyConfig) == false ?
new MultiProxy(failedProxyCache, proxyConfig, secure) :
MultiProxy.Empty);
}
private MultiProxy(FailedProxyCache failedProxyCache, string proxyConfig, bool secure)
{
_failedProxyCache = failedProxyCache;
_uris = null;
_proxyConfig = proxyConfig;
_secure = secure;
_currentIndex = 0;
_currentUri = null;
}
private MultiProxy(FailedProxyCache failedProxyCache, Uri[] uris)
{
_failedProxyCache = failedProxyCache;
_uris = uris;
_proxyConfig = null;
_secure = default;
_currentIndex = 0;
_currentUri = null;
}
/// <summary>
/// Parses a WinHTTP proxy config into a MultiProxy instance.
/// </summary>
/// <param name="proxyConfig">The WinHTTP proxy config to parse.</param>
/// <param name="secure">If true, return proxies suitable for use with a secure connection. If false, return proxies suitable for an insecure connection.</param>
public static MultiProxy Parse(FailedProxyCache failedProxyCache, string?proxyConfig, bool secure)
{
Debug.Assert(failedProxyCache != null);
Uri[] uris = Array.Empty <Uri>();
ReadOnlySpan <char> span = proxyConfig;
while (TryParseProxyConfigPart(span, secure, out Uri? uri, out int charactersConsumed))
{
int idx = uris.Length;
// Assume that we will typically not have more than 1...3 proxies, so just
// grow by 1. This method is currently only used once per process, so the
// case of an abnormally large config will not be much of a concern anyway.
Array.Resize(ref uris, idx + 1);
uris[idx] = uri;
span = span.Slice(charactersConsumed);
}
return(new MultiProxy(failedProxyCache, uris));
}
