Initial commit

2026-06-02 10:51:14 +02:00
commit d19092c84e
182 changed files with 13757 additions and 0 deletions
@@ -0,0 +1,42 @@
+using System.Text.Json;
+
+namespace SharepointToolbox.Web.Services.Auth;
+
+public class TokenRefreshService : ITokenRefreshService
+{
+    private readonly HttpClient _http;
+
+    public TokenRefreshService(HttpClient http) { _http = http; }
+
+    public async Task<TokenRefreshResult> RefreshAsync(
+        string refreshToken, string tenantId, string clientId, string scope)
+    {
+        var body = new Dictionary<string, string>
+        {
+            ["grant_type"]    = "refresh_token",
+            ["client_id"]     = clientId,
+            ["refresh_token"] = refreshToken,
+            ["scope"]         = scope,
+        };
+
+        var url  = $"https://login.microsoftonline.com/{tenantId}/oauth2/v2.0/token";
+        var resp = await _http.PostAsync(url, new FormUrlEncodedContent(body));
+        var json = await resp.Content.ReadAsStringAsync();
+
+        if (!resp.IsSuccessStatusCode)
+            throw new InvalidOperationException($"Token refresh failed ({resp.StatusCode}): {json}");
+
+        using var doc = JsonDocument.Parse(json);
+        var root      = doc.RootElement;
+        var expiresIn = root.GetProperty("expires_in").GetInt32();
+
+        return new TokenRefreshResult
+        {
+            AccessToken  = root.GetProperty("access_token").GetString()!,
+            RefreshToken = root.TryGetProperty("refresh_token", out var rt)
+                           ? rt.GetString()!
+                           : refreshToken,
+            ExpiresAt    = DateTimeOffset.UtcNow.AddSeconds(expiresIn - 30),
+        };
+    }
+}