Issue 11472: Store the "edit" history

database.sql

@@ -1,6 +1,6 @@
 -- ------------------------------------------
 -- Friendica 2022.05-rc (Siberian Iris)
--- DB_UPDATE_VERSION 1462
+-- DB_UPDATE_VERSION 1463
 -- ------------------------------------------
 
 
@@ -1155,6 +1155,32 @@ CREATE TABLE IF NOT EXISTS `post-delivery-data` (
 	FOREIGN KEY (`uri-id`) REFERENCES `item-uri` (`id`) ON UPDATE RESTRICT ON DELETE CASCADE
 ) DEFAULT COLLATE utf8mb4_general_ci COMMENT='Delivery data for items';
 
+--
+-- TABLE post-history
+--
+CREATE TABLE IF NOT EXISTS `post-history` (
+	`uri-id` int unsigned NOT NULL COMMENT 'Id of the item-uri table entry that contains the item uri',
+	`edited` datetime NOT NULL DEFAULT '0001-01-01 00:00:00' COMMENT 'Date of edit',
+	`title` varchar(255) NOT NULL DEFAULT '' COMMENT 'item title',
+	`content-warning` varchar(255) NOT NULL DEFAULT '' COMMENT '',
+	`body` mediumtext COMMENT 'item body content',
+	`raw-body` mediumtext COMMENT 'Body without embedded media links',
+	`location` varchar(255) NOT NULL DEFAULT '' COMMENT 'text location where this item originated',
+	`coord` varchar(255) NOT NULL DEFAULT '' COMMENT 'longitude/latitude pair representing location where this item originated',
+	`language` text COMMENT 'Language information about this post',
+	`app` varchar(255) NOT NULL DEFAULT '' COMMENT 'application which generated this item',
+	`rendered-hash` varchar(32) NOT NULL DEFAULT '' COMMENT '',
+	`rendered-html` mediumtext COMMENT 'item.body converted to html',
+	`object-type` varchar(100) NOT NULL DEFAULT '' COMMENT 'ActivityStreams object type',
+	`object` text COMMENT 'JSON encoded object structure unless it is an implied object (normal post)',
+	`target-type` varchar(100) NOT NULL DEFAULT '' COMMENT 'ActivityStreams target type if applicable (URI)',
+	`target` text COMMENT 'JSON encoded target structure if used',
+	`resource-id` varchar(32) NOT NULL DEFAULT '' COMMENT 'Used to link other tables to items, it identifies the linked resource (e.g. photo) and if set must also set resource_type',
+	`plink` varchar(255) NOT NULL DEFAULT '' COMMENT 'permalink or URL to a displayable copy of the message at its source',
+	 PRIMARY KEY(`uri-id`,`edited`),
+	FOREIGN KEY (`uri-id`) REFERENCES `item-uri` (`id`) ON UPDATE RESTRICT ON DELETE CASCADE
+) DEFAULT COLLATE utf8mb4_general_ci COMMENT='Post history';
+
 --
 -- TABLE post-link
 --

doc/database.md

@@ -52,6 +52,7 @@ Database Tables
 | [post-content](help/database/db_post-content) | Content for all posts |
 | [post-delivery](help/database/db_post-delivery) | Delivery data for posts for the batch processing |
 | [post-delivery-data](help/database/db_post-delivery-data) | Delivery data for items |
+| [post-history](help/database/db_post-history) | Post history |
 | [post-link](help/database/db_post-link) | Post related external links |
 | [post-media](help/database/db_post-media) | Attached media |
 | [post-question](help/database/db_post-question) | Question |

doc/database/db_post-history.md

@@ -0,0 +1,44 @@
+Table post-history
+===========
+
+Post history
+
+Fields
+------
+
+| Field           | Description                                                                                                               | Type         | Null | Key | Default             | Extra |
+| --------------- | ------------------------------------------------------------------------------------------------------------------------- | ------------ | ---- | --- | ------------------- | ----- |
+| uri-id          | Id of the item-uri table entry that contains the item uri                                                                 | int unsigned | NO   | PRI | NULL                |       |
+| edited          | Date of edit                                                                                                              | datetime     | NO   | PRI | 0001-01-01 00:00:00 |       |
+| title           | item title                                                                                                                | varchar(255) | NO   |     |                     |       |
+| content-warning |                                                                                                                           | varchar(255) | NO   |     |                     |       |
+| body            | item body content                                                                                                         | mediumtext   | YES  |     | NULL                |       |
+| raw-body        | Body without embedded media links                                                                                         | mediumtext   | YES  |     | NULL                |       |
+| location        | text location where this item originated                                                                                  | varchar(255) | NO   |     |                     |       |
+| coord           | longitude/latitude pair representing location where this item originated                                                  | varchar(255) | NO   |     |                     |       |
+| language        | Language information about this post                                                                                      | text         | YES  |     | NULL                |       |
+| app             | application which generated this item                                                                                     | varchar(255) | NO   |     |                     |       |
+| rendered-hash   |                                                                                                                           | varchar(32)  | NO   |     |                     |       |
+| rendered-html   | item.body converted to html                                                                                               | mediumtext   | YES  |     | NULL                |       |
+| object-type     | ActivityStreams object type                                                                                               | varchar(100) | NO   |     |                     |       |
+| object          | JSON encoded object structure unless it is an implied object (normal post)                                                | text         | YES  |     | NULL                |       |
+| target-type     | ActivityStreams target type if applicable (URI)                                                                           | varchar(100) | NO   |     |                     |       |
+| target          | JSON encoded target structure if used                                                                                     | text         | YES  |     | NULL                |       |
+| resource-id     | Used to link other tables to items, it identifies the linked resource (e.g. photo) and if set must also set resource_type | varchar(32)  | NO   |     |                     |       |
+| plink           | permalink or URL to a displayable copy of the message at its source                                                       | varchar(255) | NO   |     |                     |       |
+
+Indexes
+------------
+
+| Name    | Fields         |
+| ------- | -------------- |
+| PRIMARY | uri-id, edited |
+
+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/Post/History.php

@@ -0,0 +1,65 @@
+<?php
+/**
+ * @copyright Copyright (C) 2010-2022, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Model\Post;
+
+use Friendica\Core\Logger;
+use Friendica\Database\DBA;
+use Friendica\Database\Database;
+use Friendica\Database\DBStructure;
+use Friendica\Model\Post;
+
+class History
+{
+	/**
+	 * Add a post to the history before it is changed
+	 *
+	 * @param integer $uri_id
+	 * @param array   $item
+	 */
+	public static function add(int $uri_id, array $item)
+	{
+		$allfields = DBStructure::definition('', false);
+		$fields = array_keys($allfields['post-history']['fields']);
+
+		$post = Post::selectFirstPost($fields, ['uri-id' => $uri_id]);
+		if (empty($post)) {
+			return;
+		}
+
+		$update = false;
+		$changed = DBStructure::getFieldsForTable('post-history', $item);
+		unset($changed['uri-id']);
+		unset($changed['edited']);
+		foreach ($changed as $field => $content) {
+			if ($content != $post[$field]) {
+				$update = true;
+			}
+		}
+
+		if ($update) {
+			DBA::insert('post-history', $post, Database::INSERT_IGNORE);
+			Logger::info('Added history', ['uri-id' => $uri_id, 'edited' => $post['edited']]);
+		} else {
+			Logger::info('No content fields had been changed', ['uri-id' => $uri_id, 'edited' => $post['edited']]);
+		}
+	}
+}

src/Model/Post/Thread.php

@@ -22,11 +22,9 @@
 namespace Friendica\Model\Post;
 
 use \BadMethodCallException;
-use Friendica\Core\Protocol;
 use Friendica\Database\Database;
 use Friendica\Database\DBA;
 use Friendica\Database\DBStructure;
-use Friendica\Model\Post;
 
 class Thread
 {

src/Protocol/ActivityPub/Processor.php

@@ -215,6 +215,7 @@ class Processor
 			return;
 		}
 
+		Post\History::add($item['uri-id'], $item);
 		Item::update($item, ['uri' => $activity['id']]);
 
 		if ($activity['object_type'] == 'as:Event') {

static/dbstructure.config.php

@@ -55,7 +55,7 @@
 use Friendica\Database\DBA;
 
 if (!defined('DB_UPDATE_VERSION')) {
-	define('DB_UPDATE_VERSION', 1462);
+	define('DB_UPDATE_VERSION', 1463);
 }
 
 return [
@@ -1193,6 +1193,32 @@ return [
 			"PRIMARY" => ["uri-id"],
 		]
 	],
+	"post-history" => [
+		"comment" => "Post history",
+		"fields" => [
+			"uri-id" => ["type" => "int unsigned", "not null" => "1", "primary" => "1", "foreign" => ["item-uri" => "id"], "comment" => "Id of the item-uri table entry that contains the item uri"],
+			"edited" => ["type" => "datetime", "not null" => "1", "default" => DBA::NULL_DATETIME, "primary" => "1", "comment" => "Date of edit"],
+			"title" => ["type" => "varchar(255)", "not null" => "1", "default" => "", "comment" => "item title"],
+			"content-warning" => ["type" => "varchar(255)", "not null" => "1", "default" => "", "comment" => ""],
+			"body" => ["type" => "mediumtext", "comment" => "item body content"],
+			"raw-body" => ["type" => "mediumtext", "comment" => "Body without embedded media links"],
+			"location" => ["type" => "varchar(255)", "not null" => "1", "default" => "", "comment" => "text location where this item originated"],
+			"coord" => ["type" => "varchar(255)", "not null" => "1", "default" => "", "comment" => "longitude/latitude pair representing location where this item originated"],
+			"language" => ["type" => "text", "comment" => "Language information about this post"],
+			"app" => ["type" => "varchar(255)", "not null" => "1", "default" => "", "comment" => "application which generated this item"],
+			"rendered-hash" => ["type" => "varchar(32)", "not null" => "1", "default" => "", "comment" => ""],
+			"rendered-html" => ["type" => "mediumtext", "comment" => "item.body converted to html"],
+			"object-type" => ["type" => "varchar(100)", "not null" => "1", "default" => "", "comment" => "ActivityStreams object type"],
+			"object" => ["type" => "text", "comment" => "JSON encoded object structure unless it is an implied object (normal post)"],
+			"target-type" => ["type" => "varchar(100)", "not null" => "1", "default" => "", "comment" => "ActivityStreams target type if applicable (URI)"],
+			"target" => ["type" => "text", "comment" => "JSON encoded target structure if used"],
+			"resource-id" => ["type" => "varchar(32)", "not null" => "1", "default" => "", "comment" => "Used to link other tables to items, it identifies the linked resource (e.g. photo) and if set must also set resource_type"],
+			"plink" => ["type" => "varchar(255)", "not null" => "1", "default" => "", "comment" => "permalink or URL to a displayable copy of the message at its source"]
+		],
+		"indexes" => [
+			"PRIMARY" => ["uri-id", "edited"],
+		]
+	],
 	"post-link" => [
 		"comment" => "Post related external links",
 		"fields" => [