Add hook for loading a pad that also gets called when a pad is already initialized

[braadworst]

---

name: Feature request
about: Suggest an idea for this project
title: 'Add hook for loading a pad that also gets called when a pad is already initialized'
labels: enhancement
assignees:

---

Is your feature request related to a problem? Please describe.
If you would like to hook into Etherpad on the server when a pad gets loaded you can use padLoad hook. This runs only once, when the pad is not yet initiated, to my knowledge there is no hook that runs for each time you actually "load" the pad, aka go to the URL of the specific pad.

Describe the solution you'd like
Add an extra hook in the src/node/db/PadManager.js file that gets called both on initial run (like padLoad) and when the pad is already initialized. I am not sure what the best name for this hook should be, or reuse padLoad. As I don't know what the implications are for the padLoad hook getting called multiple times. But here is a possible solution:

From line 135 in src/node/db/PadManager.js

  // return pad if it's already loaded
  if (pad != null) {
    hooks.callAll('padInitialized', {pad});
    return pad;
  }

  // try to load pad
  pad = new Pad.Pad(id);

  // initialize the pad
  await pad.init(text);
  hooks.callAll('padLoad', {pad});
  hooks.callAll('padInitialized', {pad});
  globalPads.set(id, pad);
  padList.addPad(id);

Describe alternatives you've considered
Doesn't apply

Additional context
Doesn't apply

Plugin?
No

[JohnMcLear]

If you still need this let me know, there are loads of ways to solve this problem without a hook so I imagine you don't really need it :)