public static DownloadData Create(string url, string destFolder)
{
DownloadData downloadData = new DownloadData();
WebRequest request = GetRequest(url);
try
{
if (request is FtpWebRequest)
{
request.Method = "SIZE";
downloadData.response = request.GetResponse();
downloadData.GetFileSize();
request = GetRequest(url);
downloadData.response = request.GetResponse();
}
else
{
downloadData.response = request.GetResponse();
downloadData.GetFileSize();
}
}
catch (Exception ex)
{
throw new Exception($"Error downloading \"{url}\": {ex.Message}", ex);
}
ValidateResponse(downloadData.response, url);
string text = downloadData.response.Headers["Content-Disposition"];
if (text != null)
{
int num = text.IndexOf("filename=", StringComparison.OrdinalIgnoreCase);
if (num != -1)
{
num += 9;
if (text.Length > num)
{
int num2 = text.IndexOf(';', num);
num2 = ((num2 != -1) ? (num2 - num) : (text.Length - num));
text = text.Substring(num, num2).Trim();
}
else
{
text = null;
}
}
else
{
text = null;
}
}
if (string.IsNullOrEmpty(text))
{
text = Path.GetFileName(downloadData.response.ResponseUri.LocalPath);
}
if (!string.IsNullOrEmpty(text) && text.IndexOfAny(invalidFilenameChars.ToArray()) != -1)
{
StringBuilder stringBuilder = new StringBuilder(text.Length - 1);
for (int i = 0; i < text.Length; i++)
{
if (invalidFilenameChars.IndexOf(text[i]) == -1)
{
stringBuilder.Append(text[i]);
}
}
text = stringBuilder.ToString().Trim();
}
if (string.IsNullOrEmpty(text))
{
text = Path.GetFileName(Path.GetTempFileName());
}
string text2 = downloadData.Filename = Path.Combine(destFolder, text);
if (!downloadData.IsProgressKnown && File.Exists(text2))
{
File.Delete(text2);
}
if (downloadData.IsProgressKnown && File.Exists(text2))
{
if (!(downloadData.Response is HttpWebResponse))
{
File.Delete(text2);
}
else
{
downloadData.start = new FileInfo(text2).Length;
if (downloadData.start > downloadData.size)
{
File.Delete(text2);
}
else if (downloadData.start < downloadData.size)
{
downloadData.response.Close();
request = GetRequest(url);
((HttpWebRequest)request).AddRange((int)downloadData.start);
downloadData.response = request.GetResponse();
if (((HttpWebResponse)downloadData.Response).StatusCode != HttpStatusCode.PartialContent)
{
File.Delete(text2);
downloadData.start = 0L;
}
}
}
}
return(downloadData);
}
public static DownloadData Create(string url, string destFolder)
{
DownloadData downloadData = new DownloadData();
WebRequest req = GetRequest(url);
try
{
if (req is FtpWebRequest)
{
// get the file size for FTP files
req.Method = WebRequestMethods.Ftp.GetFileSize;
downloadData.response = req.GetResponse();
downloadData.GetFileSize();
// new request for downloading the FTP file
req = GetRequest(url);
downloadData.response = req.GetResponse();
}
else
{
downloadData.response = req.GetResponse();
downloadData.GetFileSize();
}
}
catch (Exception e)
{
throw new Exception(string.Format("Error downloading \"{0}\": {1}", url, e.Message), e);
}
// Check to make sure the response isn't an error. If it is this method
// will throw exceptions.
ValidateResponse(downloadData.response, url);
// Take the name of the file given to use from the web server.
string fileName = downloadData.response.Headers["Content-Disposition"];
if (fileName != null)
{
int fileLoc = fileName.IndexOf("filename=", StringComparison.OrdinalIgnoreCase);
if (fileLoc != -1)
{
// go past "filename="
fileLoc += 9;
if (fileName.Length > fileLoc)
{
// trim off an ending semicolon if it exists
int end = fileName.IndexOf(';', fileLoc);
if (end == -1)
{
end = fileName.Length - fileLoc;
}
else
{
end -= fileLoc;
}
fileName = fileName.Substring(fileLoc, end).Trim();
}
else
{
fileName = null;
}
}
else
{
fileName = null;
}
}
if (string.IsNullOrEmpty(fileName))
{
// brute force the filename from the url
fileName = Path.GetFileName(downloadData.response.ResponseUri.LocalPath);
}
// trim out non-standard filename characters
if (!string.IsNullOrEmpty(fileName) && fileName.IndexOfAny(invalidFilenameChars.ToArray()) != -1)
{
//make a new string builder (with at least one bad character)
StringBuilder newText = new StringBuilder(fileName.Length - 1);
//remove the bad characters
for (int i = 0; i < fileName.Length; i++)
{
if (invalidFilenameChars.IndexOf(fileName[i]) == -1)
{
newText.Append(fileName[i]);
}
}
fileName = newText.ToString().Trim();
}
// if filename *still* is null or empty, then generate some random temp filename
if (string.IsNullOrEmpty(fileName))
{
fileName = Path.GetFileName(Path.GetTempFileName());
}
string downloadTo = Path.Combine(destFolder, fileName);
downloadData.Filename = downloadTo;
// If we don't know how big the file is supposed to be,
// we can't resume, so delete what we already have if something is on disk already.
if (!downloadData.IsProgressKnown && File.Exists(downloadTo))
{
File.Delete(downloadTo);
}
if (downloadData.IsProgressKnown && File.Exists(downloadTo))
{
// We only support resuming on http requests
if (!(downloadData.Response is HttpWebResponse))
{
File.Delete(downloadTo);
}
else
{
// Try and start where the file on disk left off
downloadData.start = new FileInfo(downloadTo).Length;
// If we have a file that's bigger than what is online, then something
// strange happened. Delete it and start again.
if (downloadData.start > downloadData.size)
{
File.Delete(downloadTo);
}
else if (downloadData.start < downloadData.size)
{
// Try and resume by creating a new request with a new start position
downloadData.response.Close();
req = GetRequest(url);
((HttpWebRequest)req).AddRange((int)downloadData.start);
downloadData.response = req.GetResponse();
if (((HttpWebResponse)downloadData.Response).StatusCode != HttpStatusCode.PartialContent)
{
// They didn't support our resume request.
File.Delete(downloadTo);
downloadData.start = 0;
}
}
}
}
return(downloadData);
}
public static DownloadData Create(string url, string destFolder)
{
DownloadData downloadData = new DownloadData();
WebRequest req = GetRequest(url);
try
{
if (req is FtpWebRequest)
{
// get the file size for FTP files
req.Method = WebRequestMethods.Ftp.GetFileSize;
downloadData.response = req.GetResponse();
downloadData.GetFileSize();
// new request for downloading the FTP file
req = GetRequest(url);
downloadData.response = req.GetResponse();
}
else
{
downloadData.response = req.GetResponse();
downloadData.GetFileSize();
}
}
catch (Exception e)
{
throw new Exception(string.Format("Error downloading \"{0}\": {1}", url, e.Message), e);
}
// Check to make sure the response isn't an error. If it is this method
// will throw exceptions.
ValidateResponse(downloadData.response, url);
// Take the name of the file given to use from the web server.
string fileName = downloadData.response.Headers["Content-Disposition"];
if (fileName != null)
{
int fileLoc = fileName.IndexOf("filename=", StringComparison.OrdinalIgnoreCase);
if (fileLoc != -1)
{
// go past "filename="
fileLoc += 9;
if (fileName.Length > fileLoc)
{
// trim off an ending semicolon if it exists
int end = fileName.IndexOf(';', fileLoc);
if (end == -1)
end = fileName.Length - fileLoc;
else
end -= fileLoc;
fileName = fileName.Substring(fileLoc, end).Trim();
}
else
fileName = null;
}
else
fileName = null;
}
if (string.IsNullOrEmpty(fileName))
{
// brute force the filename from the url
fileName = Path.GetFileName(downloadData.response.ResponseUri.LocalPath);
}
// trim out non-standard filename characters
if (!string.IsNullOrEmpty(fileName) && fileName.IndexOfAny(invalidFilenameChars.ToArray()) != -1)
{
//make a new string builder (with at least one bad character)
StringBuilder newText = new StringBuilder(fileName.Length - 1);
//remove the bad characters
for (int i = 0; i < fileName.Length; i++)
{
if (invalidFilenameChars.IndexOf(fileName[i]) == -1)
newText.Append(fileName[i]);
}
fileName = newText.ToString().Trim();
}
// if filename *still* is null or empty, then generate some random temp filename
if (string.IsNullOrEmpty(fileName))
fileName = Path.GetFileName(Path.GetTempFileName());
string downloadTo = Path.Combine(destFolder, fileName);
downloadData.Filename = downloadTo;
// If we don't know how big the file is supposed to be,
// we can't resume, so delete what we already have if something is on disk already.
if (!downloadData.IsProgressKnown && File.Exists(downloadTo))
File.Delete(downloadTo);
if (downloadData.IsProgressKnown && File.Exists(downloadTo))
{
// We only support resuming on http requests
if (!(downloadData.Response is HttpWebResponse))
{
File.Delete(downloadTo);
}
else
{
// Try and start where the file on disk left off
downloadData.start = new FileInfo(downloadTo).Length;
// If we have a file that's bigger than what is online, then something
// strange happened. Delete it and start again.
if (downloadData.start > downloadData.size)
File.Delete(downloadTo);
else if (downloadData.start < downloadData.size)
{
// Try and resume by creating a new request with a new start position
downloadData.response.Close();
req = GetRequest(url);
((HttpWebRequest)req).AddRange((int)downloadData.start);
downloadData.response = req.GetResponse();
if (((HttpWebResponse)downloadData.Response).StatusCode != HttpStatusCode.PartialContent)
{
// They didn't support our resume request.
File.Delete(downloadTo);
downloadData.start = 0;
}
}
}
}
return downloadData;
}