/// <summary>
/// Gets the latest release tag from Github.
/// </summary>
/// <returns>Returns an <see cref="UpdateCheck"/>.</returns>
private static UpdateCheck GetLatestVersion()
{
// Somewhere to store the results
UpdateCheck results = new UpdateCheck
{
CheckSuccess = false,
};
try
{
// The API URL to check for the latest release
// Returns a JSON payload containing all the details of the latest release
string releasesUrl = "https://api.github.com/repos/benlye/flash-multi/releases/latest";
// Set TLS1.2, as required by the Github API
System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
// Create the WebRequest
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(releasesUrl);
// Set the UserAgent, as required by the Github API
webRequest.UserAgent = $"flash-multi-{Application.ProductVersion}";
// Disable keepalive so we don't hold a connection open
webRequest.KeepAlive = false;
// Get the response and read it
using (WebResponse myResponse = webRequest.GetResponse())
using (StreamReader sr = new StreamReader(myResponse.GetResponseStream(), System.Text.Encoding.UTF8))
{
// Read all of the output from the StreamReader
string result = sr.ReadToEnd();
// Parse the release tag out of the JSON
// This contains the version string
int tagStart = result.IndexOf("\"tag_name\":");
int tagEnd = result.IndexOf(",", tagStart);
string tagLine = result.Substring(tagStart, tagEnd - tagStart);
string tag = tagLine.Split('"')[3];
// Add the release tag to the results
results.LatestVersion = Version.Parse(tag);
// Parse the release URL out of the JSON
// This is the URL of the Github page containing details of the latest release
int urlStart = result.IndexOf("\"html_url\":");
int urlEnd = result.IndexOf(",", urlStart);
string urlLine = result.Substring(urlStart, urlEnd - urlStart);
string url = urlLine.Split('"')[3];
// Add the release URL to the results
results.ReleaseUrl = url;
}
// Define a regular expression to test the version number looks how we expect it to
Regex versionRegex = new Regex(@"\d+\.\d+\.\d+");
// Check that the URL and version number are as we expect
if (results.ReleaseUrl.StartsWith("https://github.com/benlye/flash-multi/releases/") && versionRegex.Match(results.LatestVersion.ToString()).Success)
{
// All looks good; the check succeeded
Debug.WriteLine($"Update check succeeded. Latest version is {results.LatestVersion}");
results.CheckSuccess = true;
}
}
catch (Exception ex)
{
Debug.WriteLine($"Error getting latest version: {ex.Message}");
}
// Return the results
return(results);
}