Finished enqueue site

SpotiParty.Web/Services/AuthorizationHandler.cs

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+using System.Net.Http.Headers;
+using System.Security.Authentication;
+using System.Text;
+using System.Text.Json.Serialization;
+using SpotifyAPI.Web;
+
+namespace SpotiParty.Web.Services;
+
+public sealed class AuthorizationHandler {
+
+    private AuthResponse? _token;
+    
+    private class AuthResponse {
+        [JsonPropertyName("access_token")]
+        public string AccessToken { get; set; }
+        
+        [JsonPropertyName("token_type")]
+        public string TokenType { get; set; }
+        
+        [JsonPropertyName("expires_in")]
+        public int ExpiresIn { get; set; }
+    }
+
+    public async Task<SpotifyClient> ConfigureClient() {
+        if (_token is null) {
+            var fileLines = await File.ReadAllLinesAsync(Path.Combine(Environment.CurrentDirectory, ".dev-token"));
+            var clientId = fileLines[0];
+            var clientSecret = fileLines[1];
+
+            var basicAuthToken = Convert.ToBase64String(Encoding.UTF8.GetBytes($"{clientId}:{clientSecret}"));
+            var httpClient = new HttpClient();
+            httpClient.DefaultRequestHeaders.Authorization = AuthenticationHeaderValue.Parse($"Basic {basicAuthToken}");
+
+            var response = await httpClient.PostAsync("https://accounts.spotify.com/api/token", new FormUrlEncodedContent(new[] {
+                new KeyValuePair<string, string>("grant_type", "client_credentials")
+            }));
+            response.EnsureSuccessStatusCode();
+            _token = await response.Content.ReadFromJsonAsync<AuthResponse>();
+
+            if (_token is null) throw new AuthenticationException("Spotify auth failed!");
+        }
+
+        return new SpotifyClient(_token.AccessToken, _token.TokenType);
+    }
+    
+}