/// <summary>
/// Update file contents if changed on server
/// </summary>
/// <param name="file"></param>
/// <param name="useRange">Use http range header</param>
/// <returns>true if the file was modified</returns>
public async Task <bool> UpdateFile(WebDAVFile file, bool useRange = true)
{
if (!file.HasContents)
{
file.Contents = (await GET(file.URI)).Contents;
return(true);
}
else
{
var client = GetClient();
var request = new HttpRequestMessage(HttpMethod.Get, file.URI);
if (useRange)
{
request.Headers.Range = new RangeHeaderValue(file.Length, null);
}
if (file.ETag != null)
{
request.Headers.TryAddWithoutValidation("If-None-Match", file.ETag);
}
var result = await client.SendAsync(request);
if (result.StatusCode == HttpStatusCode.NotModified ||
result.StatusCode == HttpStatusCode.RequestedRangeNotSatisfiable)
{
return(false);
}
if (!result.IsSuccessStatusCode && result.StatusCode != HttpStatusCode.NotModified)
{
throw new HttpRequestException("Response does not indicate success: " + result.StatusCode);
}
var body = await result.Content.ReadAsByteArrayAsync();
if (body.Length == 0)
{
return(false);
}
var newContents = new byte[body.Length + file.Contents.Length];
Buffer.BlockCopy(file.Contents, 0, newContents, 0, file.Contents.Length);
Buffer.BlockCopy(body, 0, newContents, file.Contents.Length, body.Length);
file.Contents = newContents;
file.Length = newContents.Length;
return(true);
}
}
private WebDAVFile FileFromXML(XElement element)
{
var prop = element.Element(DAV + "propstat")?.Element(DAV + "prop");
var file = new WebDAVFile
{
URI = element.Element(DAV + "href")?.Value,
Exists = true,
Contents = null,
CreationDate = DateTime.Parse(prop?.Element(DAV + "creationdate")?.Value),
LastModifiedDate = DateTime.Parse(prop?.Element(DAV + "getlastmodified")?.Value),
Filename = prop?.Element(DAV + "displayname")?.Value,
Length = prop?.Element(DAV + "getcontentlength") != null
? Int32.Parse(prop?.Element(DAV + "getcontentlength")?.Value)
: 0,
ContentType = prop?.Element(DAV + "getcontenttype")?.Value,
ETag = prop?.Element(DAV + "getetag")?.Value
};
file.IsFile = prop?.Element(DAV + "resourcetype")?.Element(DAV + "collection") == null;
return(file);
}