ApiOptions.php

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<?php
class ApiOptions extends ApiBase {

        public function __construct( $main, $action ) {
                parent::__construct( $main, $action );
        }

        public function execute() {
                $user = $this->getUser();

                if ( $user->isAnon() ) {
                        $this->dieUsage( 'Anonymous users cannot change preferences', 'notloggedin' );
                }

                $params = $this->extractRequestParams();
                $changed = false;

                if ( isset( $params['optionvalue'] ) && !isset( $params['optionname'] ) ) {
                        $this->dieUsageMsg( array( 'missingparam', 'optionname' ) );
                }

                if ( $params['reset'] ) {
                        $user->resetOptions();
                        $changed = true;
                }

                $changes = array();
                if ( count( $params['change'] ) ) {
                        foreach ( $params['change'] as $entry ) {
                                $array = explode( '=', $entry, 2 );
                                $changes[$array[0]] = isset( $array[1] ) ? $array[1] : null;
                        }
                }
                if ( isset( $params['optionname'] ) ) {
                        $newValue = isset( $params['optionvalue'] ) ? $params['optionvalue'] : null;
                        $changes[$params['optionname']] = $newValue;
                }
                if ( !$changed && !count( $changes ) ) {
                        $this->dieUsage( 'No changes were requested', 'nochanges' );
                }

                $prefs = Preferences::getPreferences( $user, $this->getContext() );
                foreach ( $changes as $key => $value ) {
                        if ( !isset( $prefs[$key] ) ) {
                                $this->setWarning( "Not a valid preference: $key" );
                                continue;
                        }
                        $field = HTMLForm::loadInputFromParameters( $key, $prefs[$key] );
                        $validation = $field->validate( $value, $user->getOptions() );
                        if ( $validation === true ) {
                                $user->setOption( $key, $value );
                                $changed = true;
                        } else {
                                $this->setWarning( "Validation error for '$key': $validation" );
                        }
                }

                if ( $changed ) {
                        // Commit changes
                        $user->saveSettings();
                }

                $this->getResult()->addValue( null, $this->getModuleName(), 'success' );
        }

        public function mustBePosted() {
                return true;
        }

        public function isWriteMode() {
                return true;
        }

        public function getAllowedParams() {
                return array(
                        'token' => array(
                                ApiBase::PARAM_TYPE => 'string',
                                ApiBase::PARAM_REQUIRED => true
                        ),
                        'reset' => false,
                        'change' => array(
                                ApiBase::PARAM_ISMULTI => true,
                        ),
                        'optionname' => array(
                                ApiBase::PARAM_TYPE => 'string',
                        ),
                        'optionvalue' => array(
                                ApiBase::PARAM_TYPE => 'string',
                        ),
                );
        }

        public function getResultProperties() {
                return array(
                        '' => array(
                                '*' => array(
                                        ApiBase::PROP_TYPE => array(
                                                'success'
                                        )
                                )
                        )
                );
        }

        public function getParamDescription() {
                return array(
                        'token' => 'An options token previously obtained through the action=tokens',
                        'reset' => 'Resets all preferences to the site defaults',
                        'change' => 'List of changes, formatted name=value (e.g. skin=vector), value cannot contain pipe characters',
                        'optionname' => 'A name of a option which should have an optionvalue set',
                        'optionvalue' => 'A value of the option specified by the optionname, can contain pipe characters',
                );
        }

        public function getDescription() {
                return 'Change preferences of the current user';
        }

        public function getPossibleErrors() {
                return array_merge( parent::getPossibleErrors(), array(
                        array( 'code' => 'notloggedin', 'info' => 'Anonymous users cannot change preferences' ),
                        array( 'code' => 'nochanges', 'info' => 'No changes were requested' ),
                ) );
        }

        public function needsToken() {
                return true;
        }

        public function getTokenSalt() {
                return '';
        }

        public function getHelpUrls() {
                return 'https://www.mediawiki.org/wiki/API:Options';
        }

        public function getExamples() {
                return array(
                        'api.php?action=options&reset=&token=123ABC',
                        'api.php?action=options&change=skin=vector|hideminor=1&token=123ABC',
                        'api.php?action=options&reset=&change=skin=monobook&optionname=nickname&optionvalue=[[User:Beau|Beau]]%20([[User_talk:Beau|talk]])&token=123ABC',
                );
        }

        public function getVersion() {
                return __CLASS__ . ': $Id$';
        }
}