Add GenerateAccessTokenForAppAsync

SteamKit2/SteamKit2/Steam/Authentication/AccessTokenGenerateResult.cs

@@ -0,0 +1,31 @@
+/*
+ * This file is subject to the terms and conditions defined in
+ * file 'license.txt', which is part of this source code package.
+ */
+
+using SteamKit2.Internal;
+
+namespace SteamKit2.Authentication
+{
+    /// <summary>
+    /// Represents access token generation result.
+    /// </summary>
+    public sealed class AccessTokenGenerateResult
+    {
+        /// <summary>
+        /// New refresh token.
+        /// This can be provided to <see cref="SteamUser.LogOnDetails.AccessToken"/>.
+        /// </summary>
+        public string RefreshToken { get; }
+        /// <summary>
+        /// New token subordinate to <see cref="RefreshToken"/>.
+        /// </summary>
+        public string AccessToken { get; }
+
+        internal AccessTokenGenerateResult( CAuthentication_AccessToken_GenerateForApp_Response response )
+        {
+            AccessToken = response.access_token;
+            RefreshToken = response.refresh_token;
+        }
+    }
+}

SteamKit2/SteamKit2/Steam/Authentication/SteamAuthentication.cs

@@ -59,6 +59,32 @@ async Task<CAuthentication_GetPasswordRSAPublicKey_Response> GetPasswordRSAPubli
             return response;
         }
 
+        /// <summary>
+        /// Given a refresh token for a client app audience (e.g. desktop client / mobile client), generate an access token.
+        /// </summary>
+        /// <param name="steamID">The SteamID this token belongs to.</param>
+        /// <param name="refreshToken">The refresh token.</param>
+        public async Task<AccessTokenGenerateResult> GenerateAccessTokenForAppAsync( SteamID steamID, string refreshToken )
+        {
+            var request = new CAuthentication_AccessToken_GenerateForApp_Request
+            {
+                refresh_token = refreshToken,
+                steamid = steamID.ConvertToUInt64(),
+                renewal_type = ETokenRenewalType.k_ETokenRenewalType_Allow,
+            };
+
+            var message = await AuthenticationService.SendMessage( api => api.GenerateAccessTokenForApp( request ) );
+
+            if ( message.Result != EResult.OK )
+            {
+                throw new AuthenticationException( "Failed to generate token", message.Result );
+            }
+
+            var response = message.GetDeserializedResponse<CAuthentication_AccessToken_GenerateForApp_Response>();
+
+            return new AccessTokenGenerateResult( response );
+        }
+
         /// <summary>
         /// Start the authentication process using QR codes.
         /// </summary>