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MediaWiki extensions manual
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Release status: stable

Assert Edit.jpg
Implementation Page action
Description Adds edit assertions, for safer bot edits
Author(s) Steve Sanbeg
MediaWiki 1.13+
PHP 5.3+
Database changes No
License GNU General Public License 2.0 or later


Hooks used


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The AssertEdit extension adds edit assertions, to help bots ensure they stay logged in and are working with the right wiki.

Rationale[edit | edit source]

When I started working with bots, I realised the potential for a simple operator error to make a lot of bad edits; such as a bot intended to run on a test wiki accidently running on wikipedia, because someone forgot to supply the -family option. It also happens that a bot may get logged out, and unknowingly continue editing anonymously, without the bot flag, until it's blocked.

It's not easy for a bot to determine whether it is logged in, without some server side support. Unfortunately, no such support was available, until now.

Usage[edit | edit source]

To use the extension, supply an additional parameter -- either assert or nassert -- when editing a page, whether through the UI (index.php) or API (api.php).

The value of the assert (or nassert) parameter should be the desired assertion. If it succeeds, the extension does nothing, and the edit proceeds as normal; if it fails, an error message is returned. assert ensures that assertion is positive, while nassert ensures it is negative. Unrecognized assertions will always fail, whether assert or nassert is used. Installations may add their own assertions; this can be used to ensure processes intended only for that site do not affect other sites. If both a positive and negative assertion are specified, then both must succeed.

Example[edit | edit source]

Having a 'bot' submit edits to the following URL (plus additional required parameters)

... /api.php?action=edit&assert=bot&nassert=exists

will cause it to fail if the account becomes logged out or loses its bot status, or when trying to edit a page that already exists.

Default assertions[edit | edit source]

keyword meaning
user Verify that bot is logged in, to prevent anonymous edits.
bot Verify that bot is logged in and has a bot flag.
true Always true; nassert=true will fail if the extension is installed.
false Always false; assert=false will fail if the extension is installed.
exists Verify that page exists. Could be useful from other extensions, i.e. adding nassert=exists to the inputbox extension.
test Verify that this wiki allows random testing. Defaults to false, but can be overridden in LocalSettings.php.

Download[edit | edit source]

You can download the extension directly from the MediaWiki source code repository (browse code). You can get:

One of the extension's tags

Not all extensions have tags. Some extensions have tags for each release, in which case those tags have the same stability as the release. To download a tag

  • Go to the tags list
  • Click the name of the tag you want to download
  • Click "snapshot"
The latest version of one of the extension's branches

Each extension has a master branch containing the latest code (might be unstable). Extensions may have further branches as well.

  • Go to the branches list
  • Click the branch name
  • Click "snapshot"
A snapshot made during the release of a MediaWiki version.

This might be unstable and is not guaranteed to work with the associated MediaWiki version.

After you've got the code, save it into the extensions/AssertEdit directory of your wiki.

If you are familiar with git and have shell access to your server, you can obtain the extension, with all its tags and branches, as follows:

cd extensions
git clone https://gerrit.wikimedia.org/r/p/mediawiki/extensions/AssertEdit.git

Installation[edit | edit source]

  • Download and extract the file(s) in a directory called AssertEdit in your extensions/ folder. If you're a developer and this extension is in a Git repository, then instead you should clone the repository.
  • Add the following code at the bottom of your LocalSettings.php:
require_once "$IP/extensions/AssertEdit/AssertEdit.php";
  • Done! Navigate to "Special:Version" on your wiki to verify that the extension is successfully installed.

Configuration[edit | edit source]

New asssertions can then be added with AssertEdit::setAssert(key, value);, where key is the name of the assertion, and value is its value; true means the assertion will succeed, false will fail.

value must either be a boolean (true or false) or a function (as defined by the PHP is_callable() function) which returns a boolean value.

AssertEdit::setAssert will fail if value is of the wrong type, or key corresponds to an assertion that cannot be overridden.

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