Delete the cache entry when the post is changed or deleted

database.sql

@@ -1012,10 +1012,13 @@ CREATE TABLE IF NOT EXISTS `openwebauth-token` (
 --
 CREATE TABLE IF NOT EXISTS `pagecache` (
 	`page` varbinary(255) NOT NULL COMMENT 'Page',
+	`uri-id` int unsigned COMMENT 'Id of the item-uri table that contains the uri the page belongs to',
 	`content` mediumtext COMMENT 'Page content',
 	`fetched` datetime COMMENT 'date when the page had been fetched',
 	 PRIMARY KEY(`page`),
-	 INDEX `fetched` (`fetched`)
+	 INDEX `fetched` (`fetched`),
+	 INDEX `uri-id` (`uri-id`),
+	FOREIGN KEY (`uri-id`) REFERENCES `item-uri` (`id`) ON UPDATE RESTRICT ON DELETE CASCADE
 ) DEFAULT COLLATE utf8mb4_general_ci COMMENT='Stores temporary data';
 
 --

doc/database/db_pagecache.md

@@ -7,8 +7,9 @@ Fields
 ------
 
 | Field   | Description                                                        | Type           | Null | Key | Default | Extra |
-| ------- | ----------------------------------- | -------------- | ---- | --- | ------- | ----- |
+| ------- | ------------------------------------------------------------------ | -------------- | ---- | --- | ------- | ----- |
 | page    | Page                                                               | varbinary(255) | NO   | PRI | NULL    |       |
+| uri-id  | Id of the item-uri table that contains the uri the page belongs to | int unsigned   | YES  |     | NULL    |       |
 | content | Page content                                                       | mediumtext     | YES  |     | NULL    |       |
 | fetched | date when the page had been fetched                                | datetime       | YES  |     | NULL    |       |
 
@@ -19,6 +20,13 @@ Indexes
 | ------- | ------- |
 | PRIMARY | page    |
 | fetched | fetched |
+| uri-id  | uri-id  |
 
+Foreign Keys
+------------
+
+| Field | Target Table | Target Field |
+|-------|--------------|--------------|
+| uri-id | [item-uri](help/database/db_item-uri) | id |
 
 Return to [database documentation](help/database)

src/Model/Item.php

@@ -196,6 +196,8 @@ class Item
 		$notify_items = [];
 
 		while ($item = DBA::fetch($items)) {
+			ActivityPub\PageCache::deleteByUriId($item['uri-id']);
+
 			if (!empty($fields['body'])) {
 				Post\Media::insertFromAttachmentData($item['uri-id'], $fields['body']);
 
@@ -319,6 +321,8 @@ class Item
 		// clean up categories and tags so they don't end up as orphans
 		Post\Category::deleteByURIId($item['uri-id'], $item['uid']);
 
+		ActivityPub\PageCache::deleteByUriId($item['uri-id']);
+
 		/*
 		 * If item is a link to a photo resource, nuke all the associated photos
 		 * (visitors will not have photo resources)

src/Module/ActivityPub/Objects.php

@@ -136,7 +136,7 @@ class Objects extends BaseModule
 		}
 
 		if (in_array($item['private'], [Item::PUBLIC, Item::UNLISTED])) {
-			PageCache::add($_SERVER['REQUEST_URI'], $data);
+			PageCache::add($_SERVER['REQUEST_URI'], $item['uri-id'], $data);
 		}
 
 		// Relaxed CORS header for public items

src/Protocol/ActivityPub/PageCache.php

@@ -36,17 +36,18 @@ class PageCache
 	 * Add content to the page cache
 	 *
 	 * @param string $page
+	 * @param int    $uriid
 	 * @param mixed $content
 	 * @return void
 	 */
-	public static function add(string $page, $content)
+	public static function add(string $page, int $uriid, $content)
 	{
 		if (!DI::config()->get('system', 'pagecache')) {
 			return;
 		}
 
 		DBA::delete('pagecache', ["`fetched` < ?", DateTimeFormat::utc('now - 5 minutes')]);
-		DBA::insert('pagecache', ['page' => $page, 'content' => serialize($content), 'fetched' => DateTimeFormat::utcNow()], Database::INSERT_UPDATE);
+		DBA::insert('pagecache', ['page' => $page, 'uri-id' => $uriid, 'content' => serialize($content), 'fetched' => DateTimeFormat::utcNow()], Database::INSERT_UPDATE);
 
 		Logger::debug('Page added', ['page' => $page]);
 	}
@@ -70,4 +71,15 @@ class PageCache
 
 		return unserialize($pagecache['content']);
 	}
+
+	/**
+	 * Delete the pagecache via its connected uri-id
+	 *
+	 * @param integer $uriid
+	 * @return void
+	 */
+	public static function deleteByUriId(int $uriid)
+	{
+		DBA::delete('pagecache', ['uri-id' => $uriid]);
+	}
 }

static/dbstructure.config.php

@@ -1055,12 +1055,14 @@ return [
 		"comment" => "Stores temporary data",
 		"fields" => [
 			"page" => ["type" => "varbinary(255)", "not null" => "1", "primary" => "1", "comment" => "Page"],
+			"uri-id" => ["type" => "int unsigned", "foreign" => ["item-uri" => "id"], "comment" => "Id of the item-uri table that contains the uri the page belongs to"],
 			"content" => ["type" => "mediumtext", "comment" => "Page content"],
 			"fetched" => ["type" => "datetime", "comment" => "date when the page had been fetched"],
 		],
 		"indexes" => [
 			"PRIMARY" => ["page"],
 			"fetched" => ["fetched"],
+			"uri-id" => ["uri-id"],
 		],
 	],
 	"parsed_url" => [