Pad: New `padCheck` hook

CHANGELOG.md

@@ -40,6 +40,7 @@
 
 * New `expressPreSession` server-side hook.
 * Pad server-side hook changes:
+  * `padCheck`: New hook.
   * `padCopy`: New `srcPad` and `dstPad` context properties.
   * `padDefaultContent`: New hook.
   * `padRemove`: New `pad` context property.

doc/api/hooks_server-side.md

@@ -366,6 +366,18 @@ Usage examples:
 
   * https://github.com/ether/ep_comments_page
 
+## `padCheck`
+
+Called from: `src/node/db/Pad.js`
+
+Called when a consistency check is run on a pad, after the core checks have
+completed successfully. An exception should be thrown if the pad is faulty in
+some way.
+
+Context properties:
+
+  * `pad`: The Pad object that is being checked.
+
 ## socketio
 Called from: src/node/hooks/express/socketio.js
 

src/node/db/Pad.js

@@ -738,4 +738,6 @@ Pad.prototype.check = async function () {
     err.message = pfx + err.message;
     throw err;
   }
+
+  await hooks.aCallAll('padCheck', {pad: this});
 };