Simplified post revision management

src/Controllers/PostController.php

@@ -157,8 +157,8 @@ public function editAction($identifier)
 	{
 		$post = PostModel::getByIdOrName($identifier);
 
-		$editToken = InputHelper::get('edit-token');
-		if ($editToken != $post->getEditToken())
+		$revision = InputHelper::get('revision');
+		if ($revision != $post->getRevision())
 			throw new SimpleException('This post was already edited by someone else in the meantime');
 
 		$jobArgs =

src/Models/Entities/PostEntity.php

@@ -47,6 +47,7 @@ public function fillFromDatabase($row)
 		$this->setCache('comment_count', $row['comment_count']);
 		$this->setCache('fav_count', $row['fav_count']);
 		$this->setCache('score', $row['score']);
+		$this->setCache('revision', $row['revision']);
 		$this->setType(new PostType($row['type']));
 		$this->setSafety(new PostSafety($row['safety']));
 	}
@@ -70,6 +71,7 @@ public function serializeToArray()
 			'tags' => array_map(function($tag) { return $tag->getName(); }, $this->getTags()),
 			'type' => $this->getType()->toInteger(),
 			'safety' => $this->getSafety()->toInteger(),
+			'revision' => $this->getRevision(),
 		];
 	}
 
@@ -145,6 +147,11 @@ public function getFavorites()
 		return $favorites;
 	}
 
+	public function getRevision()
+	{
+		return (int) $this->getColumnWithCache('revision');
+	}
+
 	public function getScore()
 	{
 		return (int) $this->getColumnWithCache('score');
@@ -521,24 +528,4 @@ public function setContentFromUrl($srcUrl)
 				unlink($tmpPath);
 		}
 	}
-
-	public function getEditToken()
-	{
-		$x = [];
-
-		foreach ($this->getTags() as $tag)
-			$x []= TextHelper::reprTag($tag->getName());
-
-		foreach ($this->getRelations() as $relatedPost)
-			$x []= TextHelper::reprPost($relatedPost);
-
-		$x []= $this->getSafety()->toInteger();
-		$x []= $this->getSource();
-		$x []= $this->getFileHash();
-
-		natcasesort($x);
-
-		$x = join(' ', $x);
-		return md5($x);
-	}
 }

src/Models/PostModel.php

@@ -30,6 +30,7 @@ protected static function saveSingle($post)
 				'image_height' => $post->getImageHeight(),
 				'uploader_id' => $post->getUploaderId(),
 				'source' => $post->getSource(),
+				'revision' => $post->getRevision() + 1,
 				];
 
 			$stmt = Sql\Statements::update();

src/Upgrades/mysql/Upgrade16.sql

@@ -0,0 +1 @@
+ALTER TABLE post ADD COLUMN revision INTEGER DEFAULT 1;

src/Upgrades/sqlite/Upgrade16.sql

@@ -0,0 +1 @@
+ALTER TABLE post ADD COLUMN revision INTEGER DEFAULT 1;

src/Views/post/post-edit.phtml

@@ -8,9 +8,9 @@
 	<h1>edit post</h1>
 
 	<input type="hidden"
-		name="edit-token"
-		id="edit-token"
-		value="<?= htmlspecialchars($this->context->transport->post->getEditToken()) ?>"/>
+		name="revision"
+		id="revision"
+		value="<?= htmlspecialchars($this->context->transport->post->getRevision()) ?>"/>
 
 	<?php
 		if (Access::check(new Privilege(

tests/Tests/JobTests/EditPostJobTest.php

@@ -10,6 +10,7 @@ public function testSaving()
 		$this->grantAccess('editPostContent');
 
 		$post = $this->postMocker->mockSingle();
+		$this->assert->areEqual(1, $post->getRevision());
 
 		$args =
 		[
@@ -20,10 +21,12 @@ public function testSaving()
 				new ApiFileInput($this->testSupport->getPath('image.jpg'), 'test.jpg'),
 		];
 
-		$this->assert->doesNotThrow(function() use ($args)
+		$post = $this->assert->doesNotThrow(function() use ($args)
 		{
-			Api::run(new EditPostJob(), $args);
+			return Api::run(new EditPostJob(), $args);
 		});
+
+		$this->assert->areEqual(2, $post->getRevision());
 	}
 
 	public function testPartialPrivilegeFail()