Esempio n. 1
0
        /// <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);
        }