/// <summary>Returns 'null' if download is not available and caller should keep polling.</summary>
private async Task <XElement> TryDownloadFileAsync(IPackageSearchRemoteControlClient client)
{
_service.LogInfo("Read file from client");
// "ReturnsNull": Only return a file if we have it locally *and* it's not older than our polling time (1 day).
using (var stream = await client.ReadFileAsync(__VsRemoteControlBehaviorOnStale.ReturnsNull).ConfigureAwait(false))
{
if (stream == null)
{
_service.LogInfo("Read file completed. Client returned no data");
return(null);
}
_service.LogInfo("Read file completed. Client returned data");
_service.LogInfo("Converting data to XElement");
// We're reading in our own XML file, but even so, use conservative settings
// just to be on the safe side. First, disallow DTDs entirely (we will never
// have one ourself). And also, prevent any external resolution of files when
// processing the xml.
var settings = new XmlReaderSettings
{
DtdProcessing = DtdProcessing.Prohibit,
XmlResolver = null
};
using (var reader = XmlReader.Create(stream, settings))
{
var result = XElement.Load(reader);
_service.LogInfo("Converting data to XElement completed");
return(result);
}
}
}
/// <summary>Returns 'null' if download is not available and caller should keep polling.</summary>
private async Task<XElement> TryDownloadFileAsync(IPackageSearchRemoteControlClient client)
{
_service.LogInfo("Read file from client");
// "ReturnsNull": Only return a file if we have it locally *and* it's not older than our polling time (1 day).
using (var stream = await client.ReadFileAsync(__VsRemoteControlBehaviorOnStale.ReturnsNull).ConfigureAwait(false))
{
if (stream == null)
{
_service.LogInfo("Read file completed. Client returned no data");
return null;
}
_service.LogInfo("Read file completed. Client returned data");
_service.LogInfo("Converting data to XElement");
// We're reading in our own XML file, but even so, use conservative settings
// just to be on the safe side. First, disallow DTDs entirely (we will never
// have one ourself). And also, prevent any external resolution of files when
// processing the xml.
var settings = new XmlReaderSettings
{
DtdProcessing = DtdProcessing.Prohibit,
XmlResolver = null
};
using (var reader = XmlReader.Create(stream, settings))
{
var result = XElement.Load(reader);
_service.LogInfo("Converting data to XElement completed");
return result;
}
}
}
