From: addshore <addshorewiki@gmail.com>
Date: Wed, 26 Feb 2014 19:49:12 +0000 (+0100)
Subject: Split the rest of Action.php into /actions/
X-Git-Tag: 1.31.0-rc.0~16767
X-Git-Url: https://git.cyclocoop.org/%27.%24link.%27?a=commitdiff_plain;h=58884580ebf1deac384ba6511ffa6668f3e23aff;p=lhc%2Fweb%2Fwiklou.git

Split the rest of Action.php into /actions/

Change-Id: I071ac5778af63a5cffffd59d804c99b2c799d4e5
---

diff --git a/includes/Action.php b/includes/Action.php
deleted file mode 100644
index 72be46f0bb..0000000000
--- a/includes/Action.php
+++ /dev/null
@@ -1,600 +0,0 @@
-<?php
-/**
- * Base classes for actions done on pages.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
- *
- * @file
- */
-
-/**
- * @defgroup Actions Action done on pages
- */
-
-/**
- * Actions are things which can be done to pages (edit, delete, rollback, etc).  They
- * are distinct from Special Pages because an action must apply to exactly one page.
- *
- * To add an action in an extension, create a subclass of Action, and add the key to
- * $wgActions.  There is also the deprecated UnknownAction hook
- *
- * Actions generally fall into two groups: the show-a-form-then-do-something-with-the-input
- * format (protect, delete, move, etc), and the just-do-something format (watch, rollback,
- * patrol, etc). The FormAction and FormlessAction classes represent these two groups.
- */
-abstract class Action {
-
-	/**
-	 * Page on which we're performing the action
-	 * @var WikiPage|Article|ImagePage|CategoryPage|Page $page
-	 */
-	protected $page;
-
-	/**
-	 * IContextSource if specified; otherwise we'll use the Context from the Page
-	 * @var IContextSource $context
-	 */
-	protected $context;
-
-	/**
-	 * The fields used to create the HTMLForm
-	 * @var Array $fields
-	 */
-	protected $fields;
-
-	/**
-	 * Get the Action subclass which should be used to handle this action, false if
-	 * the action is disabled, or null if it's not recognised
-	 * @param $action String
-	 * @param $overrides Array
-	 * @return bool|null|string|callable
-	 */
-	final private static function getClass( $action, array $overrides ) {
-		global $wgActions;
-		$action = strtolower( $action );
-
-		if ( !isset( $wgActions[$action] ) ) {
-			return null;
-		}
-
-		if ( $wgActions[$action] === false ) {
-			return false;
-		} elseif ( $wgActions[$action] === true && isset( $overrides[$action] ) ) {
-			return $overrides[$action];
-		} elseif ( $wgActions[$action] === true ) {
-			return ucfirst( $action ) . 'Action';
-		} else {
-			return $wgActions[$action];
-		}
-	}
-
-	/**
-	 * Get an appropriate Action subclass for the given action
-	 * @param $action String
-	 * @param $page Page
-	 * @param $context IContextSource
-	 * @return Action|bool|null false if the action is disabled, null
-	 *     if it is not recognised
-	 */
-	final public static function factory( $action, Page $page, IContextSource $context = null ) {
-		$classOrCallable = self::getClass( $action, $page->getActionOverrides() );
-
-		if ( is_string( $classOrCallable ) ) {
-			$obj = new $classOrCallable( $page, $context );
-			return $obj;
-		}
-
-		if ( is_callable( $classOrCallable ) ) {
-			return call_user_func_array( $classOrCallable, array( $page, $context ) );
-		}
-
-		return $classOrCallable;
-	}
-
-	/**
-	 * Get the action that will be executed, not necessarily the one passed
-	 * passed through the "action" request parameter. Actions disabled in
-	 * $wgActions will be replaced by "nosuchaction".
-	 *
-	 * @since 1.19
-	 * @param $context IContextSource
-	 * @return string: action name
-	 */
-	final public static function getActionName( IContextSource $context ) {
-		global $wgActions;
-
-		$request = $context->getRequest();
-		$actionName = $request->getVal( 'action', 'view' );
-
-		// Check for disabled actions
-		if ( isset( $wgActions[$actionName] ) && $wgActions[$actionName] === false ) {
-			$actionName = 'nosuchaction';
-		}
-
-		// Workaround for bug #20966: inability of IE to provide an action dependent
-		// on which submit button is clicked.
-		if ( $actionName === 'historysubmit' ) {
-			if ( $request->getBool( 'revisiondelete' ) ) {
-				$actionName = 'revisiondelete';
-			} else {
-				$actionName = 'view';
-			}
-		} elseif ( $actionName == 'editredlink' ) {
-			$actionName = 'edit';
-		}
-
-		// Trying to get a WikiPage for NS_SPECIAL etc. will result
-		// in WikiPage::factory throwing "Invalid or virtual namespace -1 given."
-		// For SpecialPages et al, default to action=view.
-		if ( !$context->canUseWikiPage() ) {
-			return 'view';
-		}
-
-		$action = Action::factory( $actionName, $context->getWikiPage(), $context );
-		if ( $action instanceof Action ) {
-			return $action->getName();
-		}
-
-		return 'nosuchaction';
-	}
-
-	/**
-	 * Check if a given action is recognised, even if it's disabled
-	 *
-	 * @param string $name name of an action
-	 * @return Bool
-	 */
-	final public static function exists( $name ) {
-		return self::getClass( $name, array() ) !== null;
-	}
-
-	/**
-	 * Get the IContextSource in use here
-	 * @return IContextSource
-	 */
-	final public function getContext() {
-		if ( $this->context instanceof IContextSource ) {
-			return $this->context;
-		} elseif ( $this->page instanceof Article ) {
-			// NOTE: $this->page can be a WikiPage, which does not have a context.
-			wfDebug( __METHOD__ . ': no context known, falling back to Article\'s context.' );
-			return $this->page->getContext();
-		}
-
-		wfWarn( __METHOD__ . ': no context known, falling back to RequestContext::getMain().' );
-		return RequestContext::getMain();
-	}
-
-	/**
-	 * Get the WebRequest being used for this instance
-	 *
-	 * @return WebRequest
-	 */
-	final public function getRequest() {
-		return $this->getContext()->getRequest();
-	}
-
-	/**
-	 * Get the OutputPage being used for this instance
-	 *
-	 * @return OutputPage
-	 */
-	final public function getOutput() {
-		return $this->getContext()->getOutput();
-	}
-
-	/**
-	 * Shortcut to get the User being used for this instance
-	 *
-	 * @return User
-	 */
-	final public function getUser() {
-		return $this->getContext()->getUser();
-	}
-
-	/**
-	 * Shortcut to get the Skin being used for this instance
-	 *
-	 * @return Skin
-	 */
-	final public function getSkin() {
-		return $this->getContext()->getSkin();
-	}
-
-	/**
-	 * Shortcut to get the user Language being used for this instance
-	 *
-	 * @return Language
-	 */
-	final public function getLanguage() {
-		return $this->getContext()->getLanguage();
-	}
-
-	/**
-	 * Shortcut to get the user Language being used for this instance
-	 *
-	 * @deprecated since 1.19 Use getLanguage instead
-	 * @return Language
-	 */
-	final public function getLang() {
-		wfDeprecated( __METHOD__, '1.19' );
-		return $this->getLanguage();
-	}
-
-	/**
-	 * Shortcut to get the Title object from the page
-	 * @return Title
-	 */
-	final public function getTitle() {
-		return $this->page->getTitle();
-	}
-
-	/**
-	 * Get a Message object with context set
-	 * Parameters are the same as wfMessage()
-	 *
-	 * @return Message object
-	 */
-	final public function msg() {
-		$params = func_get_args();
-		return call_user_func_array( array( $this->getContext(), 'msg' ), $params );
-	}
-
-	/**
-	 * Constructor.
-	 *
-	 * Only public since 1.21
-	 *
-	 * @param $page Page
-	 * @param $context IContextSource
-	 */
-	public function __construct( Page $page, IContextSource $context = null ) {
-		if ( $context === null ) {
-			wfWarn( __METHOD__ . ' called without providing a Context object.' );
-			// NOTE: We could try to initialize $context using $page->getContext(),
-			//      if $page is an Article. That however seems to not work seamlessly.
-		}
-
-		$this->page = $page;
-		$this->context = $context;
-	}
-
-	/**
-	 * Return the name of the action this object responds to
-	 * @return String lowercase
-	 */
-	abstract public function getName();
-
-	/**
-	 * Get the permission required to perform this action.  Often, but not always,
-	 * the same as the action name
-	 * @return String|null
-	 */
-	public function getRestriction() {
-		return null;
-	}
-
-	/**
-	 * Checks if the given user (identified by an object) can perform this action.  Can be
-	 * overridden by sub-classes with more complicated permissions schemes.  Failures here
-	 * must throw subclasses of ErrorPageError
-	 *
-	 * @param $user User: the user to check, or null to use the context user
-	 * @throws UserBlockedError|ReadOnlyError|PermissionsError
-	 * @return bool True on success
-	 */
-	protected function checkCanExecute( User $user ) {
-		$right = $this->getRestriction();
-		if ( $right !== null ) {
-			$errors = $this->getTitle()->getUserPermissionsErrors( $right, $user );
-			if ( count( $errors ) ) {
-				throw new PermissionsError( $right, $errors );
-			}
-		}
-
-		if ( $this->requiresUnblock() && $user->isBlocked() ) {
-			$block = $user->getBlock();
-			throw new UserBlockedError( $block );
-		}
-
-		// This should be checked at the end so that the user won't think the
-		// error is only temporary when he also don't have the rights to execute
-		// this action
-		if ( $this->requiresWrite() && wfReadOnly() ) {
-			throw new ReadOnlyError();
-		}
-		return true;
-	}
-
-	/**
-	 * Whether this action requires the wiki not to be locked
-	 * @return Bool
-	 */
-	public function requiresWrite() {
-		return true;
-	}
-
-	/**
-	 * Whether this action can still be executed by a blocked user
-	 * @return Bool
-	 */
-	public function requiresUnblock() {
-		return true;
-	}
-
-	/**
-	 * Set output headers for noindexing etc.  This function will not be called through
-	 * the execute() entry point, so only put UI-related stuff in here.
-	 */
-	protected function setHeaders() {
-		$out = $this->getOutput();
-		$out->setRobotPolicy( "noindex,nofollow" );
-		$out->setPageTitle( $this->getPageTitle() );
-		$this->getOutput()->setSubtitle( $this->getDescription() );
-		$out->setArticleRelated( true );
-	}
-
-	/**
-	 * Returns the name that goes in the \<h1\> page title
-	 *
-	 * @return String
-	 */
-	protected function getPageTitle() {
-		return $this->getTitle()->getPrefixedText();
-	}
-
-	/**
-	 * Returns the description that goes below the \<h1\> tag
-	 *
-	 * @return String
-	 */
-	protected function getDescription() {
-		return $this->msg( strtolower( $this->getName() ) )->escaped();
-	}
-
-	/**
-	 * The main action entry point.  Do all output for display and send it to the context
-	 * output.  Do not use globals $wgOut, $wgRequest, etc, in implementations; use
-	 * $this->getOutput(), etc.
-	 * @throws ErrorPageError
-	 */
-	abstract public function show();
-
-	/**
-	 * Execute the action in a silent fashion: do not display anything or release any errors.
-	 * @return Bool whether execution was successful
-	 */
-	abstract public function execute();
-}
-
-/**
- * An action which shows a form and does something based on the input from the form
- */
-abstract class FormAction extends Action {
-
-	/**
-	 * Get an HTMLForm descriptor array
-	 * @return Array
-	 */
-	abstract protected function getFormFields();
-
-	/**
-	 * Add pre- or post-text to the form
-	 * @return String HTML which will be sent to $form->addPreText()
-	 */
-	protected function preText() {
-		return '';
-	}
-
-	/**
-	 * @return string
-	 */
-	protected function postText() {
-		return '';
-	}
-
-	/**
-	 * Play with the HTMLForm if you need to more substantially
-	 * @param $form HTMLForm
-	 */
-	protected function alterForm( HTMLForm $form ) {
-	}
-
-	/**
-	 * Get the HTMLForm to control behavior
-	 * @return HTMLForm|null
-	 */
-	protected function getForm() {
-		$this->fields = $this->getFormFields();
-
-		// Give hooks a chance to alter the form, adding extra fields or text etc
-		wfRunHooks( 'ActionModifyFormFields', array( $this->getName(), &$this->fields, $this->page ) );
-
-		$form = new HTMLForm( $this->fields, $this->getContext(), $this->getName() );
-		$form->setSubmitCallback( array( $this, 'onSubmit' ) );
-
-		// Retain query parameters (uselang etc)
-		$form->addHiddenField( 'action', $this->getName() ); // Might not be the same as the query string
-		$params = array_diff_key(
-			$this->getRequest()->getQueryValues(),
-			array( 'action' => null, 'title' => null )
-		);
-		$form->addHiddenField( 'redirectparams', wfArrayToCgi( $params ) );
-
-		$form->addPreText( $this->preText() );
-		$form->addPostText( $this->postText() );
-		$this->alterForm( $form );
-
-		// Give hooks a chance to alter the form, adding extra fields or text etc
-		wfRunHooks( 'ActionBeforeFormDisplay', array( $this->getName(), &$form, $this->page ) );
-
-		return $form;
-	}
-
-	/**
-	 * Process the form on POST submission.  If you return false from getFormFields(),
-	 * this will obviously never be reached.  If you don't want to do anything with the
-	 * form, just return false here
-	 * @param  $data Array
-	 * @return Bool|Array true for success, false for didn't-try, array of errors on failure
-	 */
-	abstract public function onSubmit( $data );
-
-	/**
-	 * Do something exciting on successful processing of the form.  This might be to show
-	 * a confirmation message (watch, rollback, etc) or to redirect somewhere else (edit,
-	 * protect, etc).
-	 */
-	abstract public function onSuccess();
-
-	/**
-	 * The basic pattern for actions is to display some sort of HTMLForm UI, maybe with
-	 * some stuff underneath (history etc); to do some processing on submission of that
-	 * form (delete, protect, etc) and to do something exciting on 'success', be that
-	 * display something new or redirect to somewhere.  Some actions have more exotic
-	 * behavior, but that's what subclassing is for :D
-	 */
-	public function show() {
-		$this->setHeaders();
-
-		// This will throw exceptions if there's a problem
-		$this->checkCanExecute( $this->getUser() );
-
-		$form = $this->getForm();
-		if ( $form->show() ) {
-			$this->onSuccess();
-		}
-	}
-
-	/**
-	 * @see Action::execute()
-	 *
-	 * @param $data array|null
-	 * @param $captureErrors bool
-	 * @throws ErrorPageError|Exception
-	 * @return bool
-	 */
-	public function execute( array $data = null, $captureErrors = true ) {
-		try {
-			// Set a new context so output doesn't leak.
-			$this->context = clone $this->getContext();
-
-			// This will throw exceptions if there's a problem
-			$this->checkCanExecute( $this->getUser() );
-
-			$fields = array();
-			foreach ( $this->fields as $key => $params ) {
-				if ( isset( $data[$key] ) ) {
-					$fields[$key] = $data[$key];
-				} elseif ( isset( $params['default'] ) ) {
-					$fields[$key] = $params['default'];
-				} else {
-					$fields[$key] = null;
-				}
-			}
-			$status = $this->onSubmit( $fields );
-			if ( $status === true ) {
-				// This might do permanent stuff
-				$this->onSuccess();
-				return true;
-			} else {
-				return false;
-			}
-		}
-		catch ( ErrorPageError $e ) {
-			if ( $captureErrors ) {
-				return false;
-			} else {
-				throw $e;
-			}
-		}
-	}
-}
-
-/**
- * An action which just does something, without showing a form first.
- */
-abstract class FormlessAction extends Action {
-
-	/**
-	 * Show something on GET request.
-	 * @return String|null will be added to the HTMLForm if present, or just added to the
-	 *     output if not.  Return null to not add anything
-	 */
-	abstract public function onView();
-
-	/**
-	 * We don't want an HTMLForm
-	 * @return bool
-	 */
-	protected function getFormFields() {
-		return false;
-	}
-
-	/**
-	 * @param $data Array
-	 * @return bool
-	 */
-	public function onSubmit( $data ) {
-		return false;
-	}
-
-	/**
-	 * @return bool
-	 */
-	public function onSuccess() {
-		return false;
-	}
-
-	public function show() {
-		$this->setHeaders();
-
-		// This will throw exceptions if there's a problem
-		$this->checkCanExecute( $this->getUser() );
-
-		$this->getOutput()->addHTML( $this->onView() );
-	}
-
-	/**
-	 * Execute the action silently, not giving any output.  Since these actions don't have
-	 * forms, they probably won't have any data, but some (eg rollback) may do
-	 * @param array $data values that would normally be in the GET request
-	 * @param bool $captureErrors whether to catch exceptions and just return false
-	 * @throws ErrorPageError|Exception
-	 * @return Bool whether execution was successful
-	 */
-	public function execute( array $data = null, $captureErrors = true ) {
-		try {
-			// Set a new context so output doesn't leak.
-			$this->context = clone $this->getContext();
-			if ( is_array( $data ) ) {
-				$this->context->setRequest( new FauxRequest( $data, false ) );
-			}
-
-			// This will throw exceptions if there's a problem
-			$this->checkCanExecute( $this->getUser() );
-
-			$this->onView();
-			return true;
-		}
-		catch ( ErrorPageError $e ) {
-			if ( $captureErrors ) {
-				return false;
-			} else {
-				throw $e;
-			}
-		}
-	}
-}
diff --git a/includes/AutoLoader.php b/includes/AutoLoader.php
index c511b4b2b1..a6733ad021 100644
--- a/includes/AutoLoader.php
+++ b/includes/AutoLoader.php
@@ -29,7 +29,6 @@ global $wgAutoloadLocalClasses;
 
 $wgAutoloadLocalClasses = array(
 	# Includes
-	'Action' => 'includes/Action.php',
 	'AjaxDispatcher' => 'includes/AjaxDispatcher.php',
 	'AjaxResponse' => 'includes/AjaxResponse.php',
 	'AlphabeticPager' => 'includes/Pager.php',
@@ -80,8 +79,6 @@ $wgAutoloadLocalClasses = array(
 	'FeedUtils' => 'includes/FeedUtils.php',
 	'FileDeleteForm' => 'includes/FileDeleteForm.php',
 	'ForkController' => 'includes/ForkController.php',
-	'FormlessAction' => 'includes/Action.php',
-	'FormAction' => 'includes/Action.php',
 	'FormOptions' => 'includes/FormOptions.php',
 	'FormSpecialPage' => 'includes/specialpage/FormSpecialPage.php',
 	'GitInfo' => 'includes/GitInfo.php',
@@ -237,10 +234,13 @@ $wgAutoloadLocalClasses = array(
 	'XmlSelect' => 'includes/Xml.php',
 
 	# includes/actions
+	'Action' => 'includes/actions/Action.php',
 	'CachedAction' => 'includes/actions/CachedAction.php',
 	'CreditsAction' => 'includes/actions/CreditsAction.php',
 	'DeleteAction' => 'includes/actions/DeleteAction.php',
 	'EditAction' => 'includes/actions/EditAction.php',
+	'FormlessAction' => 'includes/actions/FormlessAction.php',
+	'FormAction' => 'includes/actions/FormAction.php',
 	'HistoryAction' => 'includes/actions/HistoryAction.php',
 	'HistoryPage' => 'includes/actions/HistoryAction.php',
 	'HistoryPager' => 'includes/actions/HistoryAction.php',
diff --git a/includes/actions/Action.php b/includes/actions/Action.php
new file mode 100644
index 0000000000..1180c5e57a
--- /dev/null
+++ b/includes/actions/Action.php
@@ -0,0 +1,380 @@
+<?php
+/**
+ * Base classes for actions done on pages.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+ *
+ * @file
+ */
+
+/**
+ * @defgroup Actions Action done on pages
+ */
+
+/**
+ * Actions are things which can be done to pages (edit, delete, rollback, etc).  They
+ * are distinct from Special Pages because an action must apply to exactly one page.
+ *
+ * To add an action in an extension, create a subclass of Action, and add the key to
+ * $wgActions.  There is also the deprecated UnknownAction hook
+ *
+ * Actions generally fall into two groups: the show-a-form-then-do-something-with-the-input
+ * format (protect, delete, move, etc), and the just-do-something format (watch, rollback,
+ * patrol, etc). The FormAction and FormlessAction classes represent these two groups.
+ */
+abstract class Action {
+
+	/**
+	 * Page on which we're performing the action
+	 * @var WikiPage|Article|ImagePage|CategoryPage|Page $page
+	 */
+	protected $page;
+
+	/**
+	 * IContextSource if specified; otherwise we'll use the Context from the Page
+	 * @var IContextSource $context
+	 */
+	protected $context;
+
+	/**
+	 * The fields used to create the HTMLForm
+	 * @var Array $fields
+	 */
+	protected $fields;
+
+	/**
+	 * Get the Action subclass which should be used to handle this action, false if
+	 * the action is disabled, or null if it's not recognised
+	 * @param $action String
+	 * @param $overrides Array
+	 * @return bool|null|string|callable
+	 */
+	final private static function getClass( $action, array $overrides ) {
+		global $wgActions;
+		$action = strtolower( $action );
+
+		if ( !isset( $wgActions[$action] ) ) {
+			return null;
+		}
+
+		if ( $wgActions[$action] === false ) {
+			return false;
+		} elseif ( $wgActions[$action] === true && isset( $overrides[$action] ) ) {
+			return $overrides[$action];
+		} elseif ( $wgActions[$action] === true ) {
+			return ucfirst( $action ) . 'Action';
+		} else {
+			return $wgActions[$action];
+		}
+	}
+
+	/**
+	 * Get an appropriate Action subclass for the given action
+	 * @param $action String
+	 * @param $page Page
+	 * @param $context IContextSource
+	 * @return Action|bool|null false if the action is disabled, null
+	 *     if it is not recognised
+	 */
+	final public static function factory( $action, Page $page, IContextSource $context = null ) {
+		$classOrCallable = self::getClass( $action, $page->getActionOverrides() );
+
+		if ( is_string( $classOrCallable ) ) {
+			$obj = new $classOrCallable( $page, $context );
+			return $obj;
+		}
+
+		if ( is_callable( $classOrCallable ) ) {
+			return call_user_func_array( $classOrCallable, array( $page, $context ) );
+		}
+
+		return $classOrCallable;
+	}
+
+	/**
+	 * Get the action that will be executed, not necessarily the one passed
+	 * passed through the "action" request parameter. Actions disabled in
+	 * $wgActions will be replaced by "nosuchaction".
+	 *
+	 * @since 1.19
+	 * @param $context IContextSource
+	 * @return string: action name
+	 */
+	final public static function getActionName( IContextSource $context ) {
+		global $wgActions;
+
+		$request = $context->getRequest();
+		$actionName = $request->getVal( 'action', 'view' );
+
+		// Check for disabled actions
+		if ( isset( $wgActions[$actionName] ) && $wgActions[$actionName] === false ) {
+			$actionName = 'nosuchaction';
+		}
+
+		// Workaround for bug #20966: inability of IE to provide an action dependent
+		// on which submit button is clicked.
+		if ( $actionName === 'historysubmit' ) {
+			if ( $request->getBool( 'revisiondelete' ) ) {
+				$actionName = 'revisiondelete';
+			} else {
+				$actionName = 'view';
+			}
+		} elseif ( $actionName == 'editredlink' ) {
+			$actionName = 'edit';
+		}
+
+		// Trying to get a WikiPage for NS_SPECIAL etc. will result
+		// in WikiPage::factory throwing "Invalid or virtual namespace -1 given."
+		// For SpecialPages et al, default to action=view.
+		if ( !$context->canUseWikiPage() ) {
+			return 'view';
+		}
+
+		$action = Action::factory( $actionName, $context->getWikiPage(), $context );
+		if ( $action instanceof Action ) {
+			return $action->getName();
+		}
+
+		return 'nosuchaction';
+	}
+
+	/**
+	 * Check if a given action is recognised, even if it's disabled
+	 *
+	 * @param string $name name of an action
+	 * @return Bool
+	 */
+	final public static function exists( $name ) {
+		return self::getClass( $name, array() ) !== null;
+	}
+
+	/**
+	 * Get the IContextSource in use here
+	 * @return IContextSource
+	 */
+	final public function getContext() {
+		if ( $this->context instanceof IContextSource ) {
+			return $this->context;
+		} elseif ( $this->page instanceof Article ) {
+			// NOTE: $this->page can be a WikiPage, which does not have a context.
+			wfDebug( __METHOD__ . ': no context known, falling back to Article\'s context.' );
+			return $this->page->getContext();
+		}
+
+		wfWarn( __METHOD__ . ': no context known, falling back to RequestContext::getMain().' );
+		return RequestContext::getMain();
+	}
+
+	/**
+	 * Get the WebRequest being used for this instance
+	 *
+	 * @return WebRequest
+	 */
+	final public function getRequest() {
+		return $this->getContext()->getRequest();
+	}
+
+	/**
+	 * Get the OutputPage being used for this instance
+	 *
+	 * @return OutputPage
+	 */
+	final public function getOutput() {
+		return $this->getContext()->getOutput();
+	}
+
+	/**
+	 * Shortcut to get the User being used for this instance
+	 *
+	 * @return User
+	 */
+	final public function getUser() {
+		return $this->getContext()->getUser();
+	}
+
+	/**
+	 * Shortcut to get the Skin being used for this instance
+	 *
+	 * @return Skin
+	 */
+	final public function getSkin() {
+		return $this->getContext()->getSkin();
+	}
+
+	/**
+	 * Shortcut to get the user Language being used for this instance
+	 *
+	 * @return Language
+	 */
+	final public function getLanguage() {
+		return $this->getContext()->getLanguage();
+	}
+
+	/**
+	 * Shortcut to get the user Language being used for this instance
+	 *
+	 * @deprecated since 1.19 Use getLanguage instead
+	 * @return Language
+	 */
+	final public function getLang() {
+		wfDeprecated( __METHOD__, '1.19' );
+		return $this->getLanguage();
+	}
+
+	/**
+	 * Shortcut to get the Title object from the page
+	 * @return Title
+	 */
+	final public function getTitle() {
+		return $this->page->getTitle();
+	}
+
+	/**
+	 * Get a Message object with context set
+	 * Parameters are the same as wfMessage()
+	 *
+	 * @return Message object
+	 */
+	final public function msg() {
+		$params = func_get_args();
+		return call_user_func_array( array( $this->getContext(), 'msg' ), $params );
+	}
+
+	/**
+	 * Constructor.
+	 *
+	 * Only public since 1.21
+	 *
+	 * @param $page Page
+	 * @param $context IContextSource
+	 */
+	public function __construct( Page $page, IContextSource $context = null ) {
+		if ( $context === null ) {
+			wfWarn( __METHOD__ . ' called without providing a Context object.' );
+			// NOTE: We could try to initialize $context using $page->getContext(),
+			//      if $page is an Article. That however seems to not work seamlessly.
+		}
+
+		$this->page = $page;
+		$this->context = $context;
+	}
+
+	/**
+	 * Return the name of the action this object responds to
+	 * @return String lowercase
+	 */
+	abstract public function getName();
+
+	/**
+	 * Get the permission required to perform this action.  Often, but not always,
+	 * the same as the action name
+	 * @return String|null
+	 */
+	public function getRestriction() {
+		return null;
+	}
+
+	/**
+	 * Checks if the given user (identified by an object) can perform this action.  Can be
+	 * overridden by sub-classes with more complicated permissions schemes.  Failures here
+	 * must throw subclasses of ErrorPageError
+	 *
+	 * @param $user User: the user to check, or null to use the context user
+	 * @throws UserBlockedError|ReadOnlyError|PermissionsError
+	 * @return bool True on success
+	 */
+	protected function checkCanExecute( User $user ) {
+		$right = $this->getRestriction();
+		if ( $right !== null ) {
+			$errors = $this->getTitle()->getUserPermissionsErrors( $right, $user );
+			if ( count( $errors ) ) {
+				throw new PermissionsError( $right, $errors );
+			}
+		}
+
+		if ( $this->requiresUnblock() && $user->isBlocked() ) {
+			$block = $user->getBlock();
+			throw new UserBlockedError( $block );
+		}
+
+		// This should be checked at the end so that the user won't think the
+		// error is only temporary when he also don't have the rights to execute
+		// this action
+		if ( $this->requiresWrite() && wfReadOnly() ) {
+			throw new ReadOnlyError();
+		}
+		return true;
+	}
+
+	/**
+	 * Whether this action requires the wiki not to be locked
+	 * @return Bool
+	 */
+	public function requiresWrite() {
+		return true;
+	}
+
+	/**
+	 * Whether this action can still be executed by a blocked user
+	 * @return Bool
+	 */
+	public function requiresUnblock() {
+		return true;
+	}
+
+	/**
+	 * Set output headers for noindexing etc.  This function will not be called through
+	 * the execute() entry point, so only put UI-related stuff in here.
+	 */
+	protected function setHeaders() {
+		$out = $this->getOutput();
+		$out->setRobotPolicy( "noindex,nofollow" );
+		$out->setPageTitle( $this->getPageTitle() );
+		$this->getOutput()->setSubtitle( $this->getDescription() );
+		$out->setArticleRelated( true );
+	}
+
+	/**
+	 * Returns the name that goes in the \<h1\> page title
+	 *
+	 * @return String
+	 */
+	protected function getPageTitle() {
+		return $this->getTitle()->getPrefixedText();
+	}
+
+	/**
+	 * Returns the description that goes below the \<h1\> tag
+	 *
+	 * @return String
+	 */
+	protected function getDescription() {
+		return $this->msg( strtolower( $this->getName() ) )->escaped();
+	}
+
+	/**
+	 * The main action entry point.  Do all output for display and send it to the context
+	 * output.  Do not use globals $wgOut, $wgRequest, etc, in implementations; use
+	 * $this->getOutput(), etc.
+	 * @throws ErrorPageError
+	 */
+	abstract public function show();
+
+	/**
+	 * Execute the action in a silent fashion: do not display anything or release any errors.
+	 * @return Bool whether execution was successful
+	 */
+	abstract public function execute();
+}
diff --git a/includes/actions/FormAction.php b/includes/actions/FormAction.php
new file mode 100644
index 0000000000..974ee94f52
--- /dev/null
+++ b/includes/actions/FormAction.php
@@ -0,0 +1,168 @@
+<?php
+/**
+ * Base classes for actions done on pages.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+ *
+ * @file
+ */
+
+/**
+ * @defgroup Actions Action done on pages
+ */
+
+/**
+ * An action which shows a form and does something based on the input from the form
+ */
+abstract class FormAction extends Action {
+
+	/**
+	 * Get an HTMLForm descriptor array
+	 * @return Array
+	 */
+	abstract protected function getFormFields();
+
+	/**
+	 * Add pre- or post-text to the form
+	 * @return String HTML which will be sent to $form->addPreText()
+	 */
+	protected function preText() {
+		return '';
+	}
+
+	/**
+	 * @return string
+	 */
+	protected function postText() {
+		return '';
+	}
+
+	/**
+	 * Play with the HTMLForm if you need to more substantially
+	 * @param $form HTMLForm
+	 */
+	protected function alterForm( HTMLForm $form ) {
+	}
+
+	/**
+	 * Get the HTMLForm to control behavior
+	 * @return HTMLForm|null
+	 */
+	protected function getForm() {
+		$this->fields = $this->getFormFields();
+
+		// Give hooks a chance to alter the form, adding extra fields or text etc
+		wfRunHooks( 'ActionModifyFormFields', array( $this->getName(), &$this->fields, $this->page ) );
+
+		$form = new HTMLForm( $this->fields, $this->getContext(), $this->getName() );
+		$form->setSubmitCallback( array( $this, 'onSubmit' ) );
+
+		// Retain query parameters (uselang etc)
+		$form->addHiddenField( 'action', $this->getName() ); // Might not be the same as the query string
+		$params = array_diff_key(
+			$this->getRequest()->getQueryValues(),
+			array( 'action' => null, 'title' => null )
+		);
+		$form->addHiddenField( 'redirectparams', wfArrayToCgi( $params ) );
+
+		$form->addPreText( $this->preText() );
+		$form->addPostText( $this->postText() );
+		$this->alterForm( $form );
+
+		// Give hooks a chance to alter the form, adding extra fields or text etc
+		wfRunHooks( 'ActionBeforeFormDisplay', array( $this->getName(), &$form, $this->page ) );
+
+		return $form;
+	}
+
+	/**
+	 * Process the form on POST submission.  If you return false from getFormFields(),
+	 * this will obviously never be reached.  If you don't want to do anything with the
+	 * form, just return false here
+	 * @param  $data Array
+	 * @return Bool|Array true for success, false for didn't-try, array of errors on failure
+	 */
+	abstract public function onSubmit( $data );
+
+	/**
+	 * Do something exciting on successful processing of the form.  This might be to show
+	 * a confirmation message (watch, rollback, etc) or to redirect somewhere else (edit,
+	 * protect, etc).
+	 */
+	abstract public function onSuccess();
+
+	/**
+	 * The basic pattern for actions is to display some sort of HTMLForm UI, maybe with
+	 * some stuff underneath (history etc); to do some processing on submission of that
+	 * form (delete, protect, etc) and to do something exciting on 'success', be that
+	 * display something new or redirect to somewhere.  Some actions have more exotic
+	 * behavior, but that's what subclassing is for :D
+	 */
+	public function show() {
+		$this->setHeaders();
+
+		// This will throw exceptions if there's a problem
+		$this->checkCanExecute( $this->getUser() );
+
+		$form = $this->getForm();
+		if ( $form->show() ) {
+			$this->onSuccess();
+		}
+	}
+
+	/**
+	 * @see Action::execute()
+	 *
+	 * @param $data array|null
+	 * @param $captureErrors bool
+	 * @throws ErrorPageError|Exception
+	 * @return bool
+	 */
+	public function execute( array $data = null, $captureErrors = true ) {
+		try {
+			// Set a new context so output doesn't leak.
+			$this->context = clone $this->getContext();
+
+			// This will throw exceptions if there's a problem
+			$this->checkCanExecute( $this->getUser() );
+
+			$fields = array();
+			foreach ( $this->fields as $key => $params ) {
+				if ( isset( $data[$key] ) ) {
+					$fields[$key] = $data[$key];
+				} elseif ( isset( $params['default'] ) ) {
+					$fields[$key] = $params['default'];
+				} else {
+					$fields[$key] = null;
+				}
+			}
+			$status = $this->onSubmit( $fields );
+			if ( $status === true ) {
+				// This might do permanent stuff
+				$this->onSuccess();
+				return true;
+			} else {
+				return false;
+			}
+		}
+		catch ( ErrorPageError $e ) {
+			if ( $captureErrors ) {
+				return false;
+			} else {
+				throw $e;
+			}
+		}
+	}
+}
diff --git a/includes/actions/FormlessAction.php b/includes/actions/FormlessAction.php
new file mode 100644
index 0000000000..6cab4d1d04
--- /dev/null
+++ b/includes/actions/FormlessAction.php
@@ -0,0 +1,100 @@
+<?php
+/**
+ * Base classes for actions done on pages.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+ *
+ * @file
+ */
+
+/**
+ * @defgroup Actions Action done on pages
+ */
+
+/**
+ * An action which just does something, without showing a form first.
+ */
+abstract class FormlessAction extends Action {
+
+	/**
+	 * Show something on GET request.
+	 * @return String|null will be added to the HTMLForm if present, or just added to the
+	 *     output if not.  Return null to not add anything
+	 */
+	abstract public function onView();
+
+	/**
+	 * We don't want an HTMLForm
+	 * @return bool
+	 */
+	protected function getFormFields() {
+		return false;
+	}
+
+	/**
+	 * @param $data Array
+	 * @return bool
+	 */
+	public function onSubmit( $data ) {
+		return false;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function onSuccess() {
+		return false;
+	}
+
+	public function show() {
+		$this->setHeaders();
+
+		// This will throw exceptions if there's a problem
+		$this->checkCanExecute( $this->getUser() );
+
+		$this->getOutput()->addHTML( $this->onView() );
+	}
+
+	/**
+	 * Execute the action silently, not giving any output.  Since these actions don't have
+	 * forms, they probably won't have any data, but some (eg rollback) may do
+	 * @param array $data values that would normally be in the GET request
+	 * @param bool $captureErrors whether to catch exceptions and just return false
+	 * @throws ErrorPageError|Exception
+	 * @return Bool whether execution was successful
+	 */
+	public function execute( array $data = null, $captureErrors = true ) {
+		try {
+			// Set a new context so output doesn't leak.
+			$this->context = clone $this->getContext();
+			if ( is_array( $data ) ) {
+				$this->context->setRequest( new FauxRequest( $data, false ) );
+			}
+
+			// This will throw exceptions if there's a problem
+			$this->checkCanExecute( $this->getUser() );
+
+			$this->onView();
+			return true;
+		}
+		catch ( ErrorPageError $e ) {
+			if ( $captureErrors ) {
+				return false;
+			} else {
+				throw $e;
+			}
+		}
+	}
+}