private bool DownloadFileFromWeb(string address, string filename, bool allowredirect, bool autounzip, string password = "")
{
// donwloads file from a web resource
try
{
// get web cration time
DateTime webcreationtime = GetWebCreationTimeUtc(address, allowredirect);
// download file and check for errors and uri identical to request
// do not use WebClient.Download for this!
var request = (HttpWebRequest)WebRequest.Create(address);
// allow redirect 2017/12/06 DL2ALF
request.AllowAutoRedirect = allowredirect;
request.Method = "GET";
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
HttpStatusCode status = response.StatusCode;
if ((status == HttpStatusCode.OK) && (response.ResponseUri == new Uri(address)))
{
using (var responseStream = response.GetResponseStream())
{
using (var fileToDownload = new System.IO.FileStream(filename, System.IO.FileMode.Create, System.IO.FileAccess.ReadWrite))
{
responseStream.CopyTo(fileToDownload);
}
}
}
}
// set creation time
if (File.Exists(filename))
{
File.SetCreationTime(filename, webcreationtime);
File.SetLastWriteTime(filename, webcreationtime);
// unzip the file content if enabled
if (autounzip && (Path.GetExtension(filename).ToLower() == ".zip"))
{
Console.WriteLine("[DownloadFileFromWeb] Trying to unzip downloaded file: " + filename);
return(ZIP.UncompressFile(filename, 60, password));
}
Console.WriteLine("[DownloadFileFromWeb] Downloading file from address finished: " + address);
return(true);
}
}
catch (Exception ex)
{
if (ex is WebException)
{
Console.WriteLine("[DownloadFileFromWeb] WebException while reading address: " + address + "\n" + "URI of orginal request=" + address + "\n" + "URI of responding server=" + "\n" + ex.ToString());
}
else
{
Console.WriteLine("[DownloadFileFromWeb] Error while reading address: " + address + "\n" + ex.ToString());
}
}
return(false);
}
private DOWNLOADFILESTATUS DownloadFileFromWebIfNewer(string address, string filename, bool allowredirect, bool autounzip, string password = "")
{
DateTime filecreationtime;
DateTime webcreationtime;
if (File.Exists(filename))
{
filecreationtime = File.GetCreationTimeUtc(filename);
}
else
{
filecreationtime = DateTime.MinValue;
}
webcreationtime = GetWebCreationTimeUtc(address, allowredirect);
// nothing found on web
if (webcreationtime == DateTime.MinValue)
{
return(DOWNLOADFILESTATUS.NOTFOUND);
}
if (webcreationtime > filecreationtime)
{
// web content is newer --> download and do not unzip
if (!DownloadFileFromWeb(address, filename, allowredirect, false, password))
{
return(DOWNLOADFILESTATUS.ERROR);
}
}
// unzip the file if enabled and content is a ZIP-file
if (autounzip && (Path.GetExtension(filename).ToLower() == ".zip"))
{
if (!ZIP.UncompressFile(filename, 60, password))
{
return(DOWNLOADFILESTATUS.ERROR);
}
}
// set the return value
if (webcreationtime > filecreationtime)
{
return(DOWNLOADFILESTATUS.NEWER);
}
else
{
return(DOWNLOADFILESTATUS.NOTNEWER);
}
}