/// <exception cref="InvalidArgumentException">Fail</exception>
private static IEnumerable <IPAddress> GetRemoteIPAddresses(HttpContext httpContext)
{
var result = new List <IPAddress>();
if (httpContext.Connection.RemoteIpAddress != null)
{
result.Add(httpContext.Connection.RemoteIpAddress);
}
string?failed = null;
if (httpContext.Request.Headers.TryGetValue("X-Forwarded-For", out var ipList) && ipList.Any())
{
var ips = ipList.Select(x => x.Split(",")).SelectMany(x => x).Where(x => !string.IsNullOrWhiteSpace(x));
foreach (var ip in ips)
{
// ISSUE: .NET Core 5 has proper attributes for this pattern `when true than not null` then no warning, but with standard need to `!`
if (CreyIPAddress.TryParse(ip, out var parsed))
{
result.Add(parsed !);
}
else if (failed == null)
{
failed = string.Join(",", ips);
}
}
}
if (!result.Any() && failed != null)
{
throw new InvalidArgumentException($"Failed to parse IP from one of:'{failed}'");
}
return(result);
}
public void Parse()
{
IPAddress _;
Assert.True(CreyIPAddress.TryParse("::ffff:10.65.0.11", out _));
Assert.Equal(_, IPAddress.Parse("10.65.0.11"));
Assert.True(CreyIPAddress.TryParse("1fff:0:a88:85a3::ac1f:42", out _));
Assert.True(CreyIPAddress.TryParse("127.0.0.1", out _));
Assert.Equal(_, IPAddress.Parse("127.0.0.1"));
Assert.True(CreyIPAddress.TryParse("127.0.0.1:42", out _));
Assert.Equal(_, IPAddress.Parse("127.0.0.1"));
Assert.True(CreyIPAddress.TryParse(" 127.0.0.1 ", out _));
Assert.True(CreyIPAddress.TryParse(" 127.0.0.1:42 ", out _));
Assert.Equal(_, IPAddress.Parse("127.0.0.1"));
Assert.True(CreyIPAddress.TryParse("1fff:0:a88:85a3::ac1f", out _));
Assert.Equal(_, IPAddress.Parse("1fff:0:a88:85a3::ac1f"));
Assert.True(CreyIPAddress.TryParse("[1fff:0:a88:85a3::ac1f]", out _));
Assert.Equal(_, IPAddress.Parse("1fff:0:a88:85a3::ac1f"));
Assert.True(CreyIPAddress.TryParse("fe80::1ff:fe23:4567:890a%3", out _));
Assert.True(CreyIPAddress.TryParse("[1fff:0:a88:85a3::ac1f]:42", out _));
Assert.Equal(_, IPAddress.Parse("1fff:0:a88:85a3::ac1f"));
Assert.True(CreyIPAddress.TryParse(" [1fff:0:a88:85a3::ac1f]:42 ", out _));
Assert.Equal(_, IPAddress.Parse("1fff:0:a88:85a3::ac1f"));
}