feat(custom properties): naive implementation

`satisfies` no longer ignores unknown properties in the SGL query.

examples/principals/grandma_extra.json

@@ -1,4 +1,4 @@
 {
   "roles": ["grandparent"],
   "extra": "something"
-}
+}

examples/rules/extra.json

@@ -0,0 +1,4 @@
+{
+  "grant": ["extra"],
+  "when": {"extra": "something"}
+}

sgl.js

@@ -65,7 +65,18 @@ function checkSatisfies(group, c, disjoint) {
             }
             return true;
         }
-    }
+    } else {
+        const customProperty = Object.keys(c)[0]
+        for (var i = 0; i < group.length; ++i) {
+            var p = group[i];
+            if (Array.isArray(p[customProperty])) {
+              return p[customProperty].includes(c[customProperty])
+            } else {
+              return p[customProperty] === c[customProperty]
+            }
+        }
+      }
+
     return false;
 }
 

test.js

@@ -68,6 +68,11 @@ describe('sgl', function() {
         it('multirole_satisfies_1', function() {
             assert(sgl.satisfies(p.employee_and_investor, r.enter_to_employee));
         });
+
+        it('grandma_extra_satisfies_extra', function() {
+            assert(sgl.satisfies([p.grandma_extra, p.employee_and_investor], r.extra));
+        })
+
     });
 });