Add New Version Check

Source/GrasscutterTools/Github/ReleaseAPI.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Net.Http.Headers;
+using System.Threading.Tasks;
+
+using GrasscutterTools.Utils;
+
+namespace GrasscutterTools.Github
+{
+    public static class ReleaseAPI
+    {
+        public static async Task<ReleaseInfo> GetReleasesLastest(string username, string repo)
+        {
+            var headerValue = new ProductInfoHeaderValue("GrasscutterTools", "1");
+            try
+            {
+                HttpHelper.HttpClient.DefaultRequestHeaders.UserAgent.Add(headerValue);
+                var r = await HttpHelper.GetAsync<dynamic>($"https://api.github.com/repos/{username}/{repo}/releases/latest");
+                return new ReleaseInfo
+                {
+                    TagName = r.tag_name,
+                    Url = r.html_url,
+                    CraeteTime = r.created_at,
+                    Name = r.name,
+                    Body = r.body
+                };
+            }
+            finally
+            {
+                HttpHelper.HttpClient.DefaultRequestHeaders.UserAgent.Remove(headerValue);
+            }
+        }
+
+        public class ReleaseInfo
+        {
+            public string TagName { get; set; }
+
+            public string Url { get; set; }
+
+            public DateTime CraeteTime { get; set; }
+
+            public string Name { get; set; }
+
+            public string Body { get; set; }
+        }
+    }
+}