feat: adds getRolesForPermissionAPI function

src/main/java/io/supertokens/storage/postgresql/Start.java

@@ -1498,8 +1498,11 @@ public String[] getPermissionsForRole(String role) throws StorageQueryException
 
     @Override
     public String[] getRolesThatHavePermission(String permission) throws StorageQueryException {
-        // TODO
-        return new String[0];
+        try {
+            return UserRolesQueries.getRolesThatHavePermission(this, permission);
+        } catch (SQLException e) {
+            throw new StorageQueryException(e);
+        }
     }
 
     @Override

src/main/java/io/supertokens/storage/postgresql/queries/UserRolesQueries.java

@@ -210,4 +210,20 @@ public static int deleteAllPermissionsForRole_Transaction(Start start, Connectio
 
     }
 
+    public static String[] getRolesThatHavePermission(Start start, String permission)
+            throws SQLException, StorageQueryException {
+
+        String QUERY = "SELECT role FROM " + getConfig(start).getUserRolesPermissionsTable() + " WHERE permission = ? ";
+
+        return execute(start, QUERY, pst -> pst.setString(1, permission), result -> {
+            ArrayList<String> roles = new ArrayList<>();
+
+            while (result.next()) {
+                roles.add(result.getString("role"));
+            }
+
+            return roles.toArray(String[]::new);
+        });
+    }
+
 }