resetUserEmail.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class ResetUserEmail extends Maintenance {
    public function __construct() {
        $this->addDescription( "Resets a user's email" );
        $this->addArg( 'user', 'Username or user ID, if starts with #', true );
        $this->addArg( 'email', 'Email to assign' );

        $this->addOption( 'no-reset-password', 'Don\'t reset the user\'s password', false, false );

        parent::__construct();
    }

    public function execute() {
        $userName = $this->getArg( 0 );
        if ( preg_match( '/^#\d+$/', $userName ) ) {
            $user = User::newFromId( substr( $userName, 1 ) );
        } else {
            $user = User::newFromName( $userName );
        }
        if ( !$user || !$user->getId() || !$user->loadFromId() ) {
            $this->error( "Error: user '$userName' does not exist\n", 1 );
        }

        $email = $this->getArg( 1 );
        if ( !Sanitizer::validateEmail( $email ) ) {
            $this->error( "Error: email '$email' is not valid\n", 1 );
        }

        // Code from https://wikitech.wikimedia.org/wiki/Password_reset
        $user->setEmail( $email );
        $user->setEmailAuthenticationTimestamp( wfTimestampNow() );
        $user->saveSettings();

        if ( !$this->hasOption( 'no-reset-password' ) ) {
            // Kick whomever is currently controlling the account off
            $user->setPassword( PasswordFactory::generateRandomPasswordString( 128 ) );
        }
    }
}

$maintClass = 'ResetUserEmail';
require_once RUN_MAINTENANCE_IF_MAIN;