/// <summary>
/// Looks for newer versions of the software than the currently known version.
/// </summary>
/// <returns>Returns an AvailableSoftware instance with the information
/// that was retrieved from the net.</returns>
public override AvailableSoftware searchForNewer()
{
logger.Debug("Searching for newer version of Thunderbird (" + languageCode + ")...");
string newerVersion = determineNewestVersion();
if (string.IsNullOrWhiteSpace(newerVersion))
{
return(null);
}
var currentInfo = knownInfo();
var newTriple = new versions.Triple(newerVersion);
var currentTriple = new versions.Triple(currentInfo.newestVersion);
if (newerVersion == currentInfo.newestVersion || newTriple < currentTriple)
{
// fallback to known information
return(currentInfo);
}
string[] newerChecksums = determineNewestChecksums(newerVersion);
if (null == newerChecksums || newerChecksums.Length != 2 ||
string.IsNullOrWhiteSpace(newerChecksums[0]) ||
string.IsNullOrWhiteSpace(newerChecksums[1]))
{
return(null);
}
// replace all stuff
string oldVersion = currentInfo.newestVersion;
currentInfo.newestVersion = newerVersion;
currentInfo.install32Bit.downloadUrl = currentInfo.install32Bit.downloadUrl.Replace(oldVersion, newerVersion);
currentInfo.install32Bit.checksum = newerChecksums[0];
currentInfo.install64Bit.downloadUrl = currentInfo.install64Bit.downloadUrl.Replace(oldVersion, newerVersion);
currentInfo.install64Bit.checksum = newerChecksums[1];
return(currentInfo);
}
/// <summary>
/// Looks for newer versions of the software than the currently known version.
/// </summary>
/// <returns>Returns an AvailableSoftware instance with the information
/// that was retrieved from the net.</returns>
public override AvailableSoftware searchForNewer()
{
logger.Debug("Searching for newer version of WinSCP...");
string htmlCode = null;
using (var client = new WebClient())
{
try
{
htmlCode = client.DownloadString("https://winscp.net/eng/download.php");
}
catch (Exception ex)
{
logger.Warn("Exception occurred while checking for newer version of WinSCP: " + ex.Message);
return(null);
}
client.Dispose();
}
Regex reExe = new Regex("WinSCP\\-[1-9]+\\.[0-9]+\\.[0-9]+\\-Setup\\.exe");
Match matchExe = reExe.Match(htmlCode);
if (!matchExe.Success)
{
return(null);
}
// extract new version number
string newVersion = matchExe.Value.Replace("WinSCP-", "").Replace("-Setup.exe", "");
versions.Triple newTriple = new versions.Triple(newVersion);
versions.Triple oldTriple = new versions.Triple(knownInfo().newestVersion);
if (newTriple < oldTriple)
{
return(null);
}
// version number should match usual scheme, e.g. 5.x.y, where x and y are digits
Regex version = new Regex("^[1-9]+\\.[0-9]+\\.[0-9]+$");
if (!version.IsMatch(newVersion))
{
return(null);
}
// Readme (e.g. https://winscp.net/download/WinSCP-5.9.5-ReadMe.txt) contains hash.
htmlCode = null;
using (var client = new WebClient())
{
try
{
htmlCode = client.DownloadString("https://winscp.net/download/WinSCP-" + newVersion + "-ReadMe.txt");
}
catch (Exception ex)
{
logger.Warn("Exception occurred while checking for newer version of WinSCP: " + ex.Message);
return(null);
}
client.Dispose();
} // using
// extract hash - .exe occurs first, so first hash is the one we want
Regex hash = new Regex("SHA\\-256\\: [0-9a-f]{64}");
Match matchHash = hash.Match(htmlCode);
if (!matchHash.Success)
{
return(null);
}
string newHash = matchHash.Value.Replace("SHA-256: ", "").Trim();
// The "file" https://winscp.net/download/WinSCP-5.9.5-Setup.exe or
// similar is just a HTML page that starts the download of the real
// file after a few seconds, so we have to parse the direct link of
// the download and use that.
htmlCode = null;
using (var client = new WebClient())
{
try
{
htmlCode = client.DownloadString("https://winscp.net/download/WinSCP-" + newVersion + "-Setup.exe");
}
catch (Exception ex)
{
logger.Warn("Exception occurred while checking for newer version of WinSCP: " + ex.Message);
return(null);
}
client.Dispose();
} // using
// URL for direct download is something like
// https://winscp.net/download/files/201704212143f42467fc64e4c84259bce4a07a98edbd/WinSCP-5.9.5-Setup.exe,
// where the middle part (date plus random MD5 hash?) varies.
Regex downloadUrl = new Regex(Regex.Escape("https://winscp.net/download/files/")
+ "[0-9]{12}[0-9a-f]{32}" + "/WinSCP\\-" + Regex.Escape(newVersion)
+ "\\-Setup\\.exe");
Match matchUrl = downloadUrl.Match(htmlCode);
if (!matchUrl.Success)
{
return(null);
}
// construct new version information
var newInfo = knownInfo();
// replace version number - both as newest version and in URL for download
newInfo.newestVersion = newVersion;
newInfo.install32Bit.downloadUrl = matchUrl.Value;
newInfo.install32Bit.checksum = newHash;
return(newInfo);
}
/// <summary>
/// Determines whether the detected software is older than the newest known software.
/// </summary>
/// <param name="detected">the corresponding detected software</param>
/// <returns>Returns true, if the detected software version is older
/// than the newest software version, thus needing an update.
/// Returns false, if no update is necessary.</returns>
public override bool needsUpdate(DetectedSoftware detected)
{
versions.Triple verDetected = new versions.Triple(detected.displayVersion);
versions.Triple verNewest = new versions.Triple(info().newestVersion);
return(verNewest.CompareTo(verDetected) > 0);
}
