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[mediawiki.git] / includes / specials / SpecialEmailuser.php

<?php
/**
 * Implements Special:Emailuser
 *
 * 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.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup SpecialPage
 */

/**
 * A special page that allows users to send e-mails to other users
 *
 * @ingroup SpecialPage
 */
class SpecialEmailUser extends UnlistedSpecialPage {
        protected $mTarget;

        /**
         * @var User|string $mTargetObj
         */
        protected $mTargetObj;

        public function __construct() {
                parent::__construct( 'Emailuser' );
        }

        public function getDescription() {
                $target = self::getTarget( $this->mTarget );
                if ( !$target instanceof User ) {
                        return $this->msg( 'emailuser-title-notarget' )->text();
                }

                return $this->msg( 'emailuser-title-target', $target->getName() )->text();
        }

        protected function getFormFields() {
                return array(
                        'From' => array(
                                'type' => 'info',
                                'raw' => 1,
                                'default' => Linker::link(
                                        $this->getUser()->getUserPage(),
                                        htmlspecialchars( $this->getUser()->getName() )
                                ),
                                'label-message' => 'emailfrom',
                                'id' => 'mw-emailuser-sender',
                        ),
                        'To' => array(
                                'type' => 'info',
                                'raw' => 1,
                                'default' => Linker::link(
                                        $this->mTargetObj->getUserPage(),
                                        htmlspecialchars( $this->mTargetObj->getName() )
                                ),
                                'label-message' => 'emailto',
                                'id' => 'mw-emailuser-recipient',
                        ),
                        'Target' => array(
                                'type' => 'hidden',
                                'default' => $this->mTargetObj->getName(),
                        ),
                        'Subject' => array(
                                'type' => 'text',
                                'default' => $this->msg( 'defemailsubject',
                                        $this->getUser()->getName() )->inContentLanguage()->text(),
                                'label-message' => 'emailsubject',
                                'maxlength' => 200,
                                'size' => 60,
                                'required' => true,
                        ),
                        'Text' => array(
                                'type' => 'textarea',
                                'rows' => 20,
                                'cols' => 80,
                                'label-message' => 'emailmessage',
                                'required' => true,
                        ),
                        'CCMe' => array(
                                'type' => 'check',
                                'label-message' => 'emailccme',
                                'default' => $this->getUser()->getBoolOption( 'ccmeonemails' ),
                        ),
                );
        }

        public function execute( $par ) {
                $out = $this->getOutput();
                $out->addModuleStyles( 'mediawiki.special' );

                $this->mTarget = is_null( $par )
                        ? $this->getRequest()->getVal( 'wpTarget', $this->getRequest()->getVal( 'target', '' ) )
                        : $par;

                // This needs to be below assignment of $this->mTarget because
                // getDescription() needs it to determine the correct page title.
                $this->setHeaders();
                $this->outputHeader();

                // error out if sending user cannot do this
                $error = self::getPermissionsError(
                        $this->getUser(),
                        $this->getRequest()->getVal( 'wpEditToken' ),
                        $this->getConfig()
                );

                switch ( $error ) {
                        case null:
                                # Wahey!
                                break;
                        case 'badaccess':
                                throw new PermissionsError( 'sendemail' );
                        case 'blockedemailuser':
                                throw new UserBlockedError( $this->getUser()->mBlock );
                        case 'actionthrottledtext':
                                throw new ThrottledError;
                        case 'mailnologin':
                        case 'usermaildisabled':
                                throw new ErrorPageError( $error, "{$error}text" );
                        default:
                                # It's a hook error
                                list( $title, $msg, $params ) = $error;
                                throw new ErrorPageError( $title, $msg, $params );
                }
                // Got a valid target user name? Else ask for one.
                $ret = self::getTarget( $this->mTarget );
                if ( !$ret instanceof User ) {
                        if ( $this->mTarget != '' ) {
                                // Messages used here: notargettext, noemailtext, nowikiemailtext
                                $ret = ( $ret == 'notarget' ) ? 'emailnotarget' : ( $ret . 'text' );
                                $out->wrapWikiMsg( "<p class='error'>$1</p>", $ret );
                        }
                        $out->addHTML( $this->userForm( $this->mTarget ) );

                        return;
                }

                $this->mTargetObj = $ret;

                $context = new DerivativeContext( $this->getContext() );
                $context->setTitle( $this->getPageTitle() ); // Remove subpage
                $form = new HTMLForm( $this->getFormFields(), $context );
                // By now we are supposed to be sure that $this->mTarget is a user name
                $form->addPreText( $this->msg( 'emailpagetext', $this->mTarget )->parse() );
                $form->setSubmitTextMsg( 'emailsend' );
                $form->setSubmitCallback( array( __CLASS__, 'uiSubmit' ) );
                $form->setWrapperLegendMsg( 'email-legend' );
                $form->loadData();

                if ( !wfRunHooks( 'EmailUserForm', array( &$form ) ) ) {
                        return;
                }

                $result = $form->show();

                if ( $result === true || ( $result instanceof Status && $result->isGood() ) ) {
                        $out->setPageTitle( $this->msg( 'emailsent' ) );
                        $out->addWikiMsg( 'emailsenttext', $this->mTarget );
                        $out->returnToMain( false, $this->mTargetObj->getUserPage() );
                }
        }

        /**
         * Validate target User
         *
         * @param string $target Target user name
         * @return User User object on success or a string on error
         */
        public static function getTarget( $target ) {
                if ( $target == '' ) {
                        wfDebug( "Target is empty.\n" );

                        return 'notarget';
                }

                $nu = User::newFromName( $target );
                if ( !$nu instanceof User || !$nu->getId() ) {
                        wfDebug( "Target is invalid user.\n" );

                        return 'notarget';
                } elseif ( !$nu->isEmailConfirmed() ) {
                        wfDebug( "User has no valid email.\n" );

                        return 'noemail';
                } elseif ( !$nu->canReceiveEmail() ) {
                        wfDebug( "User does not allow user emails.\n" );

                        return 'nowikiemail';
                }

                return $nu;
        }

        /**
         * Check whether a user is allowed to send email
         *
         * @param User $user
         * @param string $editToken Edit token
         * @param Config $config optional for backwards compatibility
         * @return string|null Null on success or string on error
         */
        public static function getPermissionsError( $user, $editToken, Config $config = null ) {
                if ( $config === null ) {
                        wfDebug( __METHOD__ . ' called without a Config instance passed to it' );
                        $config = ConfigFactory::getDefaultInstance()->makeConfig( 'main' );
                }
                if ( !$config->get( 'EnableEmail' ) || !$config->get( 'EnableUserEmail' ) ) {
                        return 'usermaildisabled';
                }

                if ( !$user->isAllowed( 'sendemail' ) ) {
                        return 'badaccess';
                }

                if ( !$user->isEmailConfirmed() ) {
                        return 'mailnologin';
                }

                if ( $user->isBlockedFromEmailuser() ) {
                        wfDebug( "User is blocked from sending e-mail.\n" );

                        return "blockedemailuser";
                }

                if ( $user->pingLimiter( 'emailuser' ) ) {
                        wfDebug( "Ping limiter triggered.\n" );

                        return 'actionthrottledtext';
                }

                $hookErr = false;

                wfRunHooks( 'UserCanSendEmail', array( &$user, &$hookErr ) );
                wfRunHooks( 'EmailUserPermissionsErrors', array( $user, $editToken, &$hookErr ) );

                if ( $hookErr ) {
                        return $hookErr;
                }

                return null;
        }

        /**
         * Form to ask for target user name.
         *
         * @param string $name User name submitted.
         * @return string Form asking for user name.
         */
        protected function userForm( $name ) {
                $string = Xml::openElement(
                        'form',
                        array( 'method' => 'get', 'action' => wfScript(), 'id' => 'askusername' )
                ) .
                        Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() ) .
                        Xml::openElement( 'fieldset' ) .
                        Html::rawElement( 'legend', null, $this->msg( 'emailtarget' )->parse() ) .
                        Xml::inputLabel(
                                $this->msg( 'emailusername' )->text(),
                                'target',
                                'emailusertarget',
                                30,
                                $name
                        ) .
                        ' ' .
                        Xml::submitButton( $this->msg( 'emailusernamesubmit' )->text() ) .
                        Xml::closeElement( 'fieldset' ) .
                        Xml::closeElement( 'form' ) . "\n";

                return $string;
        }

        /**
         * Submit callback for an HTMLForm object, will simply call submit().
         *
         * @since 1.20
         * @param array $data
         * @param HTMLForm $form
         * @return Status|string|bool
         */
        public static function uiSubmit( array $data, HTMLForm $form ) {
                return self::submit( $data, $form->getContext() );
        }

        /**
         * Really send a mail. Permissions should have been checked using
         * getPermissionsError(). It is probably also a good
         * idea to check the edit token and ping limiter in advance.
         *
         * @param array $data
         * @param IContextSource $context
         * @return Status|string|bool Status object, or potentially a String on error
         * or maybe even true on success if anything uses the EmailUser hook.
         */
        public static function submit( array $data, IContextSource $context ) {
                $config = $context->getConfig();

                $target = self::getTarget( $data['Target'] );
                if ( !$target instanceof User ) {
                        // Messages used here: notargettext, noemailtext, nowikiemailtext
                        return $context->msg( $target . 'text' )->parseAsBlock();
                }

                $to = MailAddress::newFromUser( $target );
                $from = MailAddress::newFromUser( $context->getUser() );
                $subject = $data['Subject'];
                $text = $data['Text'];

                // Add a standard footer and trim up trailing newlines
                $text = rtrim( $text ) . "\n\n-- \n";
                $text .= $context->msg( 'emailuserfooter',
                        $from->name, $to->name )->inContentLanguage()->text();

                $error = '';
                if ( !wfRunHooks( 'EmailUser', array( &$to, &$from, &$subject, &$text, &$error ) ) ) {
                        return $error;
                }

                if ( $config->get( 'UserEmailUseReplyTo' ) ) {
                        // Put the generic wiki autogenerated address in the From:
                        // header and reserve the user for Reply-To.
                        //
                        // This is a bit ugly, but will serve to differentiate
                        // wiki-borne mails from direct mails and protects against
                        // SPF and bounce problems with some mailers (see below).
                        $mailFrom = new MailAddress( $config->get( 'PasswordSender' ),
                                wfMessage( 'emailsender' )->inContentLanguage()->text() );
                        $replyTo = $from;
                } else {
                        // Put the sending user's e-mail address in the From: header.
                        //
                        // This is clean-looking and convenient, but has issues.
                        // One is that it doesn't as clearly differentiate the wiki mail
                        // from "directly" sent mails.
                        //
                        // Another is that some mailers (like sSMTP) will use the From
                        // address as the envelope sender as well. For open sites this
                        // can cause mails to be flunked for SPF violations (since the
                        // wiki server isn't an authorized sender for various users'
                        // domains) as well as creating a privacy issue as bounces
                        // containing the recipient's e-mail address may get sent to
                        // the sending user.
                        $mailFrom = $from;
                        $replyTo = null;
                }

                $status = UserMailer::send( $to, $mailFrom, $subject, $text, $replyTo );

                if ( !$status->isGood() ) {
                        return $status;
                } else {
                        // if the user requested a copy of this mail, do this now,
                        // unless they are emailing themselves, in which case one
                        // copy of the message is sufficient.
                        if ( $data['CCMe'] && $to != $from ) {
                                $cc_subject = $context->msg( 'emailccsubject' )->rawParams(
                                        $target->getName(), $subject )->text();
                                wfRunHooks( 'EmailUserCC', array( &$from, &$from, &$cc_subject, &$text ) );
                                $ccStatus = UserMailer::send( $from, $from, $cc_subject, $text );
                                $status->merge( $ccStatus );
                        }

                        wfRunHooks( 'EmailUserComplete', array( $to, $from, $subject, $text ) );

                        return $status;
                }
        }

        protected function getGroupName() {
                return 'users';
        }
}