1 files changed, 100 insertions, 0 deletions
diff --git a/Jellyfin.Api/Auth/BaseAuthorizationHandler.cs b/Jellyfin.Api/Auth/BaseAuthorizationHandler.cs
new file mode 100644
index 000000000..953acac80
--- /dev/null
+++ b/Jellyfin.Api/Auth/BaseAuthorizationHandler.cs
@@ -0,0 +1,100 @@
+using System.Net;
+using System.Security.Claims;
+using Jellyfin.Api.Helpers;
+using Jellyfin.Data.Enums;
+using MediaBrowser.Common.Net;
+using MediaBrowser.Controller.Library;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Http;
+
+namespace Jellyfin.Api.Auth
+{
+    /// <summary>
+    /// Base authorization handler.
+    /// </summary>
+    /// <typeparam name="T">Type of Authorization Requirement.</typeparam>
+    public abstract class BaseAuthorizationHandler<T> : AuthorizationHandler<T>
+        where T : IAuthorizationRequirement
+    {
+        private readonly IUserManager _userManager;
+        private readonly INetworkManager _networkManager;
+        private readonly IHttpContextAccessor _httpContextAccessor;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="BaseAuthorizationHandler{T}"/> class.
+        /// </summary>
+        /// <param name="userManager">Instance of the <see cref="IUserManager"/> interface.</param>
+        /// <param name="networkManager">Instance of the <see cref="INetworkManager"/> interface.</param>
+        /// <param name="httpContextAccessor">Instance of the <see cref="IHttpContextAccessor"/> interface.</param>
+        protected BaseAuthorizationHandler(
+            IUserManager userManager,
+            INetworkManager networkManager,
+            IHttpContextAccessor httpContextAccessor)
+        {
+            _userManager = userManager;
+            _networkManager = networkManager;
+            _httpContextAccessor = httpContextAccessor;
+        }
+
+        /// <summary>
+        /// Validate authenticated claims.
+        /// </summary>
+        /// <param name="claimsPrincipal">Request claims.</param>
+        /// <param name="ignoreSchedule">Whether to ignore parental control.</param>
+        /// <param name="localAccessOnly">Whether access is to be allowed locally only.</param>
+        /// <returns>Validated claim status.</returns>
+        protected bool ValidateClaims(
+            ClaimsPrincipal claimsPrincipal,
+            bool ignoreSchedule = false,
+            bool localAccessOnly = false)
+        {
+            // Ensure claim has userId.
+            var userId = ClaimHelpers.GetUserId(claimsPrincipal);
+            if (userId == null)
+            {
+                return false;
+            }
+
+            // Ensure userId links to a valid user.
+            var user = _userManager.GetUserById(userId.Value);
+            if (user == null)
+            {
+                return false;
+            }
+
+            // Ensure user is not disabled.
+            if (user.HasPermission(PermissionKind.IsDisabled))
+            {
+                return false;
+            }
+
+            var ip = NormalizeIp(_httpContextAccessor.HttpContext.Connection.RemoteIpAddress).ToString();
+            var isInLocalNetwork = _networkManager.IsInLocalNetwork(ip);
+            // User cannot access remotely and user is remote
+            if (!user.HasPermission(PermissionKind.EnableRemoteAccess) && !isInLocalNetwork)
+            {
+                return false;
+            }
+
+            if (localAccessOnly && !isInLocalNetwork)
+            {
+                return false;
+            }
+
+            // User attempting to access out of parental control hours.
+            if (!ignoreSchedule
+                && !user.HasPermission(PermissionKind.IsAdministrator)
+                && !user.IsParentalScheduleAllowed())
+            {
+                return false;
+            }
+
+            return true;
+        }
+
+        private static IPAddress NormalizeIp(IPAddress ip)
+        {
+            return ip.IsIPv4MappedToIPv6 ? ip.MapToIPv4() : ip;
+        }
+    }
+}