feat: Permission::is_allowed() as convenience method (#450)

Author: Byron

git-sec/src/permission.rs

@@ -27,6 +27,10 @@ where
 impl<R> std::error::Error for Error<R> where R: std::fmt::Debug {}
 
 impl Permission {
+    /// Return true if this instance is `Permission::Allow`.
+    pub fn is_allowed(&self) -> bool {
+        matches!(self, Permission::Allow)
+    }
     /// Check this permissions and produce a reply to indicate if the `resource` can be used and in which way.
     ///
     /// Only if this permission is set to `Allow` will the resource be usable.

git-sec/tests/sec.rs

@@ -25,6 +25,13 @@ mod permission {
         assert_eq!(Permission::Deny.check_opt("hi"), None);
         assert_eq!(Permission::Forbid.check_opt("hi"), None);
     }
+
+    #[test]
+    fn is_allowed() {
+        assert!(Permission::Allow.is_allowed());
+        assert!(!Permission::Deny.is_allowed());
+        assert!(!Permission::Forbid.is_allowed());
+    }
 }
 
 mod identity;