Add view functions to Proxy pallet for runtime-specific type configuration #7297 (#7320)

Solves https://github.com/paritytech/polkadot-sdk/issues/7297

I added a ProxyApi runtime API to the Proxy pallet with two methods:

check_permissions: Checks if a RuntimeCall passes a ProxyType's
InstanceFilter.
is_superset: Verifies if one ProxyType includes another.




Polkadot address: 121HJWZtD13GJQPD82oEj3gSeHqsRYm1mFgRALu4L96kfPD1

---------

Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: Bastian Köcher <info@kchr.de>

.gitignore

@@ -41,3 +41,4 @@ substrate.code-workspace
 target/
 *.scale
 justfile
+rustc-ice-*

prdoc/pr_7320.prdoc

+title: Add view functions to Proxy pallet for runtime-specific type configuration.
+
+doc:
+- audience: Runtime User
+  description: |-
+    Adds two view functions to `pallet-proxy`:
+    `check_permissions`: Checks if a given RuntimeCall is allowed for a specific ProxyType
+    using the InstanceFilter trait.
+    `is_superset`: Checks if one ProxyType is a superset of another ProxyType by comparing
+    them using the PartialOrd trait.
+
+crates:
+  - name: pallet-proxy
+    bump: minor 

substrate/frame/proxy/src/lib.rs

@@ -37,7 +37,7 @@ extern crate alloc;
 use alloc::{boxed::Box, vec};
 use frame::{
 	prelude::*,
-	traits::{Currency, ReservableCurrency},
+	traits::{Currency, InstanceFilter, ReservableCurrency},
 };
 pub use pallet::*;
 pub use weights::WeightInfo;
@@ -590,6 +590,22 @@ pub mod pallet {
 		),
 		ValueQuery,
 	>;
+
+	#[pallet::view_functions_experimental]
+	impl<T: Config> Pallet<T> {
+		/// Check if a `RuntimeCall` is allowed for a given `ProxyType`.
+		pub fn check_permissions(
+			call: <T as Config>::RuntimeCall,
+			proxy_type: T::ProxyType,
+		) -> bool {
+			proxy_type.filter(&call)
+		}
+
+		/// Check if one `ProxyType` is a subset of another `ProxyType`.
+		pub fn is_superset(to_check: T::ProxyType, against: T::ProxyType) -> bool {
+			to_check.is_superset(&against)
+		}
+	}
 }
 
 impl<T: Config> Pallet<T> {