ApiOptions.php

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<?php
class ApiOptions extends ApiBase {
    public function execute() {
        $user = $this->getUser();

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

        if ( !$user->isAllowed( 'editmyoptions' ) ) {
            $this->dieUsage( 'You don\'t have permission to edit your options', 'permissiondenied' );
        }

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

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

        if ( $params['reset'] ) {
            $user->resetOptions( $params['resetkinds'], $this->getContext() );
            $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() );
        $prefsKinds = $user->getOptionKinds( $this->getContext(), $changes );

        foreach ( $changes as $key => $value ) {
            switch ( $prefsKinds[$key] ) {
                case 'registered':
                    // Regular option.
                    $field = HTMLForm::loadInputFromParameters( $key, $prefs[$key] );
                    $validation = $field->validate( $value, $user->getOptions() );
                    break;
                case 'registered-multiselect':
                case 'registered-checkmatrix':
                    // A key for a multiselect or checkmatrix option.
                    $validation = true;
                    $value = $value !== null ? (bool)$value : null;
                    break;
                case 'userjs':
                    // Allow non-default preferences prefixed with 'userjs-', to be set by user scripts
                    if ( strlen( $key ) > 255 ) {
                        $validation = "key too long (no more than 255 bytes allowed)";
                    } elseif ( preg_match( "/[^a-zA-Z0-9_-]/", $key ) !== 0 ) {
                        $validation = "invalid key (only a-z, A-Z, 0-9, _, - allowed)";
                    } else {
                        $validation = true;
                    }
                    break;
                case 'special':
                    $validation = "cannot be set by this module";
                    break;
                case 'unused':
                default:
                    $validation = "not a valid preference";
                    break;
            }
            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() {
        $optionKinds = User::listOptionKinds();
        $optionKinds[] = 'all';

        return array(
            'token' => array(
                ApiBase::PARAM_TYPE => 'string',
                ApiBase::PARAM_REQUIRED => true
            ),
            'reset' => false,
            'resetkinds' => array(
                ApiBase::PARAM_TYPE => $optionKinds,
                ApiBase::PARAM_DFLT => 'all',
                ApiBase::PARAM_ISMULTI => true
            ),
            '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 preferences to the site defaults',
            'resetkinds' => 'List of types of options to reset when the "reset" option is set',
            'change' => array( 'List of changes, formatted name=value (e.g. skin=vector), ' .
                'value cannot contain pipe characters. If no value is given (not ',
                'even an equals sign), e.g., optionname|otheroption|..., the ' .
                'option will be reset to its default value'
            ),
            '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 array(
            'Change preferences of the current user.',
            'Only options which are registered in core or in one of installed extensions,',
            'or as options with keys prefixed with \'userjs-\' (intended to be used by user',
            'scripts), can be set.'
        );
    }

    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',
        );
    }
}