chore: Added start of IGDBClient to grab game data

CFDiscordBot/IGDBClient.cs

@@ -0,0 +1,71 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace CFDiscordBot
+{
+    public class IGDBClient
+    {
+        HttpClient _hc;
+        string _clientId;
+        string _clientSecret;
+
+        AccessToken token;
+
+        public IGDBClient(string client_id, string client_secret, HttpClient client)
+        {
+            _clientId = client_id;
+            _clientSecret = client_secret;
+
+            _hc = client;
+            _hc.BaseAddress = new Uri("https://api.igdb.com/");
+        }
+
+        public async Task<JsonElement> SearchGamesAsync(string query)
+        {
+            await GetTwitchToken();
+
+            var response = await _hc.PostAsync("/v4/games/", new StringContent(query));
+
+            return JsonSerializer.Deserialize<JsonElement>(await response.Content.ReadAsStringAsync());
+        }
+
+        private async Task GetTwitchToken()
+        {
+            if (token == null || (token.Expires - DateTimeOffset.Now).TotalMinutes < 5)
+            {
+                var response = await _hc.PostAsync($"https://id.twitch.tv/oauth2/token?client_id={_clientId}&client_secret={_clientSecret}&grant_type=client_credentials", null);
+                var str = await response.Content.ReadAsStringAsync();
+                token = JsonSerializer.Deserialize<AccessToken>(str);
+            }
+
+            _hc.DefaultRequestHeaders.Remove("Authorization");
+            _hc.DefaultRequestHeaders.Remove("Client-ID");
+
+            _hc.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", $"Bearer {token.Token}");
+            _hc.DefaultRequestHeaders.TryAddWithoutValidation("Client-ID", _clientId);
+        }
+
+        private class AccessToken
+        {
+            [JsonPropertyName("access_token")]
+            public string Token { get; set; }
+            [JsonPropertyName("token_type")]
+            public string Type { get; set; }
+            [JsonPropertyName("expires_in")]
+            public long ExpiresIn { get; set; }
+            private DateTimeOffset? _expires { get; set; }
+            public DateTimeOffset Expires
+            {
+                get
+                {
+                    if (_expires == null)
+                    {
+                        _expires = DateTimeOffset.Now.AddSeconds(ExpiresIn);
+                    }
+
+                    return _expires.Value;
+                }
+            }
+        }
+    }
+}