From 18776bd8cb5680560bceba18309d0c5c04d59268 Mon Sep 17 00:00:00 2001
From: Alejandro Pinar Ruiz <alejandropinarruiz@gmail.com>
Date: Wed, 1 Jun 2022 20:33:02 +0200
Subject: [PATCH] Add CheckItemVisibility util templated from
 CheckSectionVisibility

---
 src/utils/CheckItemVisibility.js | 84 ++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 src/utils/CheckItemVisibility.js

diff --git a/src/utils/CheckItemVisibility.js b/src/utils/CheckItemVisibility.js
new file mode 100644
index 00000000..4a1c0be3
--- /dev/null
+++ b/src/utils/CheckItemVisibility.js
@@ -0,0 +1,84 @@
+/**
+ * A helper function that checks if an item is visible based on current users permissions
+ * Checks an item displayData for hideForUsers, showForUsers and hideForGuests
+ * Returns a boolean that determines if the user has the required permissions
+ */
+
+// Import helper functions from auth, to get current user, and check if guest
+import { getCurrentUser, isLoggedInAsGuest } from '@/utils/Auth';
+import { localStorageKeys } from '@/utils/defaults';
+
+/* Helper function, checks if a given testValue is found in the visibility list */
+const determineVisibility = (visibilityList, testValue) => {
+  let isFound = false;
+  visibilityList.forEach((visibilityItem) => {
+    if (visibilityItem.toLowerCase() === testValue.toLowerCase()) isFound = true;
+  });
+  return isFound;
+};
+
+/* Helper function, determines if two arrays have any intersecting elements
+   (one or more items that are the same) */
+const determineIntersection = (source = [], target = []) => {
+  const intersections = source.filter(item => target.indexOf(item) !== -1);
+  return intersections.length > 0;
+};
+
+/* Returns false if this item should not be rendered for the current user/ guest */
+const isItemVisibleToUser = (displayData, currentUser, isGuest) => {
+  // Checks if user explicitly has access to a certain item
+  const checkVisibility = () => {
+    if (!currentUser) return true;
+    const hideForUsers = displayData.hideForUsers || [];
+    const cUsername = currentUser.user.toLowerCase();
+    return !determineVisibility(hideForUsers, cUsername);
+  };
+  // Checks if user is explicitly prevented from viewing a certain item
+  const checkHiddenability = () => {
+    if (!currentUser) return true;
+    const cUsername = currentUser.user.toLowerCase();
+    const showForUsers = displayData.showForUsers || [];
+    if (showForUsers.length < 1) return true;
+    return determineVisibility(showForUsers, cUsername);
+  };
+  const checkKeycloakVisibility = () => {
+    if (!displayData.hideForKeycloakUsers) return true;
+
+    const { groups, roles } = JSON.parse(localStorage.getItem(localStorageKeys.KEYCLOAK_INFO) || '{}');
+    const hideForGroups = displayData.hideForKeycloakUsers.groups || [];
+    const hideForRoles = displayData.hideForKeycloakUsers.roles || [];
+
+    return !(determineIntersection(hideForRoles, roles)
+      || determineIntersection(hideForGroups, groups));
+  };
+  const checkKeycloakHiddenability = () => {
+    if (!displayData.showForKeycloakUsers) return true;
+
+    const { groups, roles } = JSON.parse(localStorage.getItem(localStorageKeys.KEYCLOAK_INFO) || '{}');
+    const showForGroups = displayData.showForKeycloakUsers.groups || [];
+    const showForRoles = displayData.showForKeycloakUsers.roles || [];
+
+    return determineIntersection(showForRoles, roles)
+      || determineIntersection(showForGroups, groups);
+  };
+  // Checks if the current user is a guest, and if item allows for guests
+  const checkIfHideForGuest = () => {
+    const hideForGuest = displayData.hideForGuests;
+    return !(hideForGuest && isGuest);
+  };
+  return checkVisibility()
+    && checkHiddenability()
+    && checkIfHideForGuest()
+    && checkKeycloakVisibility()
+    && checkKeycloakHiddenability();
+};
+
+/* Putting it all together, the function to export */
+const checkItemVisibility = (item) => {
+  const currentUser = getCurrentUser(); // Get current user object
+  const isGuest = isLoggedInAsGuest(); // Check if current user is a guest
+  const displayData = item.displayData || {};
+  return isItemVisibleToUser(displayData, currentUser, isGuest);
+};
+
+export default checkItemVisibility;