Add `entry_before_update` and `entry_before_add` hooks (#7977)

Discussion: https://github.com/FreshRSS/FreshRSS/discussions/7973

Changes proposed in this pull request:

- Add new extension hook "entry_before_add"
- Add new extension hook "entry_before_update"

How to test the feature manually:

1. Create extension that uses the hooks and confirm they are invoked correctly.

Extension to use for testing
https://github.com/rnkln/freshrss-xExtension-Discord/pull/2

1 files changed, 13 insertions, 0 deletions

diff --git a/app/Controllers/importExportController.php b/app/Controllers/importExportController.php
index 6ecd9b501..9f9f6b2bd 100644
--- a/app/Controllers/importExportController.php
+++ b/app/Controllers/importExportController.php
@@ -485,9 +485,22 @@ class FreshRSS_importExport_Controller extends FreshRSS_ActionController {
 			}
 
 			if (isset($existingHashForGuids['f_' . $feed_id][$entry->guid()])) {
+				$entry = Minz_ExtensionManager::callHook('entry_before_update', $entry);
+				if (!($entry instanceof FreshRSS_Entry)) {
+					// An extension has returned a null value, there is nothing to insert.
+					continue;
+				}
+
 				$ok = $this->entryDAO->updateEntry($entry->toArray());
 			} else {
 				$entry->_lastSeen(time());
+
+				$entry = Minz_ExtensionManager::callHook('entry_before_add', $entry);
+				if (!($entry instanceof FreshRSS_Entry)) {
+					// An extension has returned a null value, there is nothing to insert.
+					continue;
+				}
+
 				$ok = $this->entryDAO->addEntry($entry->toArray());
 			}