Drupal access Management module
This would deny access to all of your content regardless of any other access control. If it returned NODE_ACCESS_ALLOW it would *allow* access to all of your content! Unless some other module returns NODE_ACCESS_DENY, in which case access would still be denied.
Even worse, your custom hook_node_access function is ignored by Views, Menus, and other content queries on the site. Even though you have denied access to all content, you’ll still see all of your normal menu links, and will see your nodes listed in Views. Only when you click on a node to view it’s full detail page will you then be denied. You might be violating content privacy just by showing that certain content exists!
A “Deny” based approach
Drupal is a “deny-based” access control system. In other words, if anybody denies access to a node, then the node is blocked. This is similar to having multiple locks on your door: you need to open ALL the locks to enter your door. Using hook_node_access to return NODE_ACCESS_ALLOW access violates this convention and is generally a bad idea. Instead you should design your modules to DENY access when needed, and otherwise return NODE_ACCESS_IGNORE to allow other modules to decide if access should be granted. The hook_node_access results are the “last line of defense” for denying access and don’t stop Views or Menus from showing parts of the content anyway.
The correct approach is to use the Drupal “Grant” system. This API existed in previous versions, but in Drupal 7 it was cleaned up and works much better. The key hooks are hook_node_grants($account, $op) and .hook_node_access_records($node). The documentation can be hard to follow and talks about “realms” and “grant ids”. Instead, let me explain this API using the concepts of Locks and Keys.
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