Initial commit

Services/OAuth/AppRegistrationResult.cs

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+namespace SharepointToolbox.Web.Services.OAuth;
+
+public class AppRegistrationResult
+{
+    public string ClientId { get; set; } = string.Empty;
+    public string DisplayName { get; set; } = string.Empty;
+    public string TenantId { get; set; } = string.Empty;
+    public string TenantUrl { get; set; } = string.Empty;
+    public string TenantName { get; set; } = string.Empty;
+}

Services/OAuth/IOAuthFlowCache.cs

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+using SharepointToolbox.Web.Core.Models;
+
+namespace SharepointToolbox.Web.Services.OAuth;
+
+public interface IOAuthFlowCache
+{
+    void StoreFlowState(string state, OAuthFlowState flowState);
+    OAuthFlowState? GetAndRemoveFlowState(string state);
+    void StoreTokens(string tokenKey, SessionTokens tokens);
+    SessionTokens? GetAndRemoveTokens(string tokenKey);
+    void StoreRegistrationResult(string key, AppRegistrationResult result);
+    AppRegistrationResult? GetAndRemoveRegistrationResult(string key);
+}

Services/OAuth/OAuthFlowCache.cs

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+using Microsoft.Extensions.Caching.Memory;
+using SharepointToolbox.Web.Core.Models;
+
+namespace SharepointToolbox.Web.Services.OAuth;
+
+public class OAuthFlowCache : IOAuthFlowCache
+{
+    private readonly IMemoryCache _cache;
+
+    public OAuthFlowCache(IMemoryCache cache) { _cache = cache; }
+
+    public void StoreFlowState(string state, OAuthFlowState flowState) =>
+        _cache.Set($"oauth_state_{state}", flowState, TimeSpan.FromMinutes(10));
+
+    public OAuthFlowState? GetAndRemoveFlowState(string state)
+    {
+        var key = $"oauth_state_{state}";
+        var value = _cache.Get<OAuthFlowState>(key);
+        if (value is not null) _cache.Remove(key);
+        return value;
+    }
+
+    public void StoreTokens(string tokenKey, SessionTokens tokens) =>
+        _cache.Set($"oauth_tokens_{tokenKey}", tokens, TimeSpan.FromMinutes(2));
+
+    public SessionTokens? GetAndRemoveTokens(string tokenKey)
+    {
+        var key = $"oauth_tokens_{tokenKey}";
+        var value = _cache.Get<SessionTokens>(key);
+        if (value is not null) _cache.Remove(key);
+        return value;
+    }
+
+    public void StoreRegistrationResult(string key, AppRegistrationResult result) =>
+        _cache.Set($"oauth_reg_{key}", result, TimeSpan.FromMinutes(5));
+
+    public AppRegistrationResult? GetAndRemoveRegistrationResult(string key)
+    {
+        var cacheKey = $"oauth_reg_{key}";
+        var value = _cache.Get<AppRegistrationResult>(cacheKey);
+        if (value is not null) _cache.Remove(cacheKey);
+        return value;
+    }
+}

Services/OAuth/OAuthFlowState.cs

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+namespace SharepointToolbox.Web.Services.OAuth;
+
+public class OAuthFlowState
+{
+    public string CodeVerifier { get; set; } = string.Empty;
+    public string ProfileId { get; set; } = string.Empty;
+    public string TenantId { get; set; } = string.Empty;
+    public string ClientId { get; set; } = string.Empty;
+    public string SpHost { get; set; } = string.Empty;
+    public string ReturnUrl { get; set; } = "/";
+
+    // Registration flow only
+    public bool IsRegistration { get; set; }
+    public string TenantName { get; set; } = string.Empty;
+    public string TenantUrl { get; set; } = string.Empty;
+}