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includes/actions/SpecialPageAction.php (1 issue)

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<?php
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/**
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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 *
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 * @file
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 * @ingroup Actions
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 */
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/**
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 * An action that just passes the request to the relevant special page
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 *
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 * @ingroup Actions
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 * @since 1.25
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 */
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class SpecialPageAction extends FormlessAction {
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	/**
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	 * @var array A mapping of action names to special page names.
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	 */
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	public static $actionToSpecialPageMapping = [
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		'revisiondelete' => 'Revisiondelete',
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		'editchangetags' => 'EditTags',
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	];
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	public function getName() {
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		$request = $this->getRequest();
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		$actionName = $request->getVal( 'action', 'view' );
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		// TODO: Shouldn't need to copy-paste this code from Action::getActionName!
40 View Code Duplication
		if ( $actionName === 'historysubmit' ) {
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			if ( $request->getBool( 'revisiondelete' ) ) {
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				$actionName = 'revisiondelete';
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			} elseif ( $request->getBool( 'editchangetags' ) ) {
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				$actionName = 'editchangetags';
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			}
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		}
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		if ( isset( self::$actionToSpecialPageMapping[$actionName] ) ) {
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			return $actionName;
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		}
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		return 'nosuchaction';
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	}
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	public function requiresUnblock() {
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		return false;
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	}
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	public function getDescription() {
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		return '';
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	}
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	public function onView() {
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		return '';
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	}
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	public function show() {
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		$special = $this->getSpecialPage();
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		if ( !$special ) {
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			throw new ErrorPageError(
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				$this->msg( 'nosuchaction' ), $this->msg( 'nosuchactiontext' ) );
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		}
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		$special->setContext( $this->getContext() );
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		$special->getContext()->setTitle( $special->getPageTitle() );
0 ignored issues
show
It seems like you code against a concrete implementation and not the interface IContextSource as the method setTitle() does only exist in the following implementations of said interface: DerivativeContext, EditWatchlistNormalHTMLForm, HTMLForm, OOUIHTMLForm, OutputPage, PreferencesForm, RequestContext, UploadForm, VFormHTMLForm.

Let’s take a look at an example:

interface User
{
    /** @return string */
    public function getPassword();
}

class MyUser implements User
{
    public function getPassword()
    {
        // return something
    }

    public function getDisplayName()
    {
        // return some name.
    }
}

class AuthSystem
{
    public function authenticate(User $user)
    {
        $this->logger->info(sprintf('Authenticating %s.', $user->getDisplayName()));
        // do something.
    }
}

In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.

Available Fixes

  1. Change the type-hint for the parameter:

    class AuthSystem
    {
        public function authenticate(MyUser $user) { /* ... */ }
    }
    
  2. Add an additional type-check:

    class AuthSystem
    {
        public function authenticate(User $user)
        {
            if ($user instanceof MyUser) {
                $this->logger->info(/** ... */);
            }
    
            // or alternatively
            if ( ! $user instanceof MyUser) {
                throw new \LogicException(
                    '$user must be an instance of MyUser, '
                   .'other instances are not supported.'
                );
            }
    
        }
    }
    
Note: PHP Analyzer uses reverse abstract interpretation to narrow down the types inside the if block in such a case.
  1. Add the method to the interface:

    interface User
    {
        /** @return string */
        public function getPassword();
    
        /** @return string */
        public function getDisplayName();
    }
    
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		$special->run( '' );
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	}
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	public function doesWrites() {
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		$special = $this->getSpecialPage();
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		return $special ? $special->doesWrites() : false;
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	}
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	/**
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	 * @return SpecialPage|null
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	 */
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	protected function getSpecialPage() {
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		$action = $this->getName();
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		if ( $action === 'nosuchaction' ) {
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			return null;
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		}
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		// map actions to (whitelisted) special pages
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		return SpecialPageFactory::getPage( self::$actionToSpecialPageMapping[$action] );
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	}
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}
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