Added [user_perm()] support to medusa system

src/Nadeko.Medusa/Attributes/user_permAttribute.cs

@@ -0,0 +1,24 @@
+using Discord;
+
+namespace Nadeko.Snake;
+
+[AttributeUsage(AttributeTargets.Method)]
+public sealed class user_permAttribute : Attribute
+{
+    public GuildPermission? GuildPerm { get; }
+    public ChannelPermission? ChannelPerm { get; }
+    
+
+    public user_permAttribute(GuildPermission perm)
+    {
+        GuildPerm = perm;
+        ChannelPerm = null;
+    }
+
+    public user_permAttribute(ChannelPermission perm)
+    {
+        ChannelPerm = perm;
+        GuildPerm = null;
+    }
+}
+

src/NadekoBot/Common/Medusa/MedusaLoaderService.cs

@@ -418,6 +418,14 @@ public sealed class MedusaLoaderService : IMedusaLoaderService, IReadyExecutor,
             foreach (var f in cmd.Filters)
                 cb.AddPrecondition(new FilterAdapter(f, strings));
 
+            foreach (var up in cmd.UserPerms)
+            {
+                if (up.GuildPerm is { } gp)
+                    cb.AddPrecondition(new UserPermAttribute(gp));
+                else if (up.ChannelPerm is { } cp)
+                    cb.AddPrecondition(new UserPermAttribute(cp));
+            }
+
             cb.WithPriority(cmd.Priority);
             
             // using summary to save method name
@@ -760,6 +768,7 @@ public sealed class MedusaLoaderService : IMedusaLoaderService, IReadyExecutor,
         foreach (var method in methodInfos)
         {
             var filters = method.GetCustomAttributes<FilterAttribute>(true).ToArray();
+            var userPerms = method.GetCustomAttributes<user_permAttribute>(false).ToArray();
             var prio = method.GetCustomAttribute<prioAttribute>(true)?.Priority ?? 0;
 
             var paramInfos = method.GetParameters();
@@ -847,6 +856,7 @@ public sealed class MedusaLoaderService : IMedusaLoaderService, IReadyExecutor,
                 method,
                 instance,
                 filters,
+                userPerms,
                 cmdContext,
                 diParams,
                 cmdParams,

src/NadekoBot/Common/Medusa/Models/SnekCommandData.cs

@@ -11,6 +11,7 @@ public sealed class SnekCommandData
         MethodInfo methodInfo,
         Snek module,
         FilterAttribute[] filters,
+        user_permAttribute[] userPerms,
         CommandContextType contextType,
         IReadOnlyList<Type> injectedParams,
         IReadOnlyList<ParamData> parameters,
@@ -21,6 +22,7 @@ public sealed class SnekCommandData
         MethodInfo = methodInfo;
         Module = module;
         Filters = filters;
+        UserPerms = userPerms;
         ContextType = contextType;
         InjectedParams = injectedParams;
         Parameters = parameters;
@@ -28,6 +30,8 @@ public sealed class SnekCommandData
         OptionalStrings = strings;
     }
 
+    public user_permAttribute[] UserPerms { get; set; }
+
     public CommandStrings OptionalStrings { get; set; }
 
     public IReadOnlyCollection<string> Aliases { get; }