Refactor OAuth handling and add GetAuthorizationUrl method

Entities/DiscordSession.cs

@@ -70,28 +70,6 @@ internal class DiscordSession (IToken token, HttpClient httpClient, ScopesBuilde
         return await _req<DiscordConnection>("users/@me/connections");
     }
 
-    public string GetAuthorizationUrl(string state)
-    {
-
-        NameValueCollection query = new()
-        {
-            ["client_id"] = clientId.ToString(),
-            ["redirect_uri"] = redirectUri,
-            ["response_type"] = "code",
-            ["scope"] = scopes.ToString(),
-            ["state"] = state,
-            ["prompt"] = prompt ? "consent" : "none"
-        };
-
-        var uriBuilder = new UriBuilder("https://discord.com/api/oauth2/authorize")
-        {
-            Query = query.ToString()
-        };
-
-        return uriBuilder.ToString();
-        
-    }
-
     public IToken GetToken(CancellationToken cancellationToken = default)
     {
         if (token.AccessToken is null)

Entities/DiscordUser.cs

@@ -7,7 +7,7 @@ namespace yawaflua.Discord.Net.Entities;
 internal class DiscordUser : IUser
 {
     [JsonPropertyName("id")]
-    public ulong Id { get; set; }
+    public string Id { get; set; }
     
     [JsonPropertyName("username")]
     public string Username { get; set; }

Entities/OAuthToken.cs

@@ -7,15 +7,27 @@ namespace yawaflua.Discord.Net.Entities;
 
 internal class OAuthToken (HttpClient client, ulong ClientId, string ClientSecret) : IToken
 {
-    [JsonPropertyName("access_token")] public string AccessToken { get; set; }
+    public string AccessToken { get; set; }
 
-    [JsonPropertyName("expires_in")] public int ExpiresIn { get; set; }
+    public int ExpiresIn { get; set; }
 
-    [JsonPropertyName("refresh_token")] public string RefreshToken { get; set; }
+    public string RefreshToken { get; set; }
 
-    [JsonPropertyName("scope")] public string Scope { get; set; }
+    public string Scope { get; set; }
 
-    [JsonPropertyName("token_type")] public string TokenType { get; set; }
+    public string TokenType { get; set; }
+
+    public static OAuthToken FromDTO(TokenDto dto, HttpClient client, ulong ClientId, string ClientSecret)
+    {
+        return new(client, ClientId, ClientSecret)
+        {
+            AccessToken = dto.AccessToken,
+            ExpiresIn = dto.ExpiresIn,
+            RefreshToken = dto.RefreshToken,
+            Scope = dto.Scope,
+            TokenType = dto.TokenType
+        };
+    }
     public Task RevokeAsync(CancellationToken cancellationToken = default)
     {
         using var request = new HttpRequestMessage(HttpMethod.Post, "https://discord.com/api/oauth2/token/revoke")

Entities/TokenDto.cs

@@ -0,0 +1,16 @@
+using System.Text.Json.Serialization;
+
+namespace yawaflua.Discord.Net.Entities;
+
+public class TokenDto
+{
+    [JsonPropertyName("access_token")] public string AccessToken { get; set; }
+
+    [JsonPropertyName("expires_in")] public int ExpiresIn { get; set; }
+
+    [JsonPropertyName("refresh_token")] public string RefreshToken { get; set; }
+
+    [JsonPropertyName("scope")] public string Scope { get; set; }
+
+    [JsonPropertyName("token_type")] public string TokenType { get; set; }
+}