ApiEditPage.php

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<?php
use MediaWiki\Storage\RevisionRecord;

class ApiEditPage extends ApiBase {
    public function execute() {
        $this->useTransactionalTimeLimit();

        $user = $this->getUser();
        $params = $this->extractRequestParams();

        $this->requireAtLeastOneParameter( $params, 'text', 'appendtext', 'prependtext', 'undo' );

        $pageObj = $this->getTitleOrPageId( $params );
        $titleObj = $pageObj->getTitle();
        $apiResult = $this->getResult();

        if ( $params['redirect'] ) {
            if ( $params['prependtext'] === null && $params['appendtext'] === null
                && $params['section'] !== 'new'
            ) {
                $this->dieWithError( 'apierror-redirect-appendonly' );
            }
            if ( $titleObj->isRedirect() ) {
                $oldTitle = $titleObj;

                $titles = Revision::newFromTitle( $oldTitle, false, Revision::READ_LATEST )
                    ->getContent( RevisionRecord::FOR_THIS_USER, $user )
                    ->getRedirectChain();
                // array_shift( $titles );

                $redirValues = [];

                foreach ( $titles as $id => $newTitle ) {
                    if ( !isset( $titles[$id - 1] ) ) {
                        $titles[$id - 1] = $oldTitle;
                    }

                    $redirValues[] = [
                        'from' => $titles[$id - 1]->getPrefixedText(),
                        'to' => $newTitle->getPrefixedText()
                    ];

                    $titleObj = $newTitle;
                }

                ApiResult::setIndexedTagName( $redirValues, 'r' );
                $apiResult->addValue( null, 'redirects', $redirValues );

                // Since the page changed, update $pageObj
                $pageObj = WikiPage::factory( $titleObj );
            }
        }

        if ( !isset( $params['contentmodel'] ) || $params['contentmodel'] == '' ) {
            $contentHandler = $pageObj->getContentHandler();
        } else {
            $contentHandler = ContentHandler::getForModelID( $params['contentmodel'] );
        }
        $contentModel = $contentHandler->getModelID();

        $name = $titleObj->getPrefixedDBkey();
        $model = $contentHandler->getModelID();

        if ( $params['undo'] > 0 ) {
            // allow undo via api
        } elseif ( $contentHandler->supportsDirectApiEditing() === false ) {
            $this->dieWithError( [ 'apierror-no-direct-editing', $model, $name ] );
        }

        if ( !isset( $params['contentformat'] ) || $params['contentformat'] == '' ) {
            $contentFormat = $contentHandler->getDefaultFormat();
        } else {
            $contentFormat = $params['contentformat'];
        }

        if ( !$contentHandler->isSupportedFormat( $contentFormat ) ) {
            $this->dieWithError( [ 'apierror-badformat', $contentFormat, $model, $name ] );
        }

        if ( $params['createonly'] && $titleObj->exists() ) {
            $this->dieWithError( 'apierror-articleexists' );
        }
        if ( $params['nocreate'] && !$titleObj->exists() ) {
            $this->dieWithError( 'apierror-missingtitle' );
        }

        // Now let's check whether we're even allowed to do this
        $this->checkTitleUserPermissions(
            $titleObj,
            $titleObj->exists() ? 'edit' : [ 'edit', 'create' ],
            [ 'autoblock' => true ]
        );

        $toMD5 = $params['text'];
        if ( !is_null( $params['appendtext'] ) || !is_null( $params['prependtext'] ) ) {
            $content = $pageObj->getContent();

            if ( !$content ) {
                if ( $titleObj->getNamespace() == NS_MEDIAWIKI ) {
                    # If this is a MediaWiki:x message, then load the messages
                    # and return the message value for x.
                    $text = $titleObj->getDefaultMessageText();
                    if ( $text === false ) {
                        $text = '';
                    }

                    try {
                        $content = ContentHandler::makeContent( $text, $titleObj );
                    } catch ( MWContentSerializationException $ex ) {
                        $this->dieWithException( $ex, [
                            'wrap' => ApiMessage::create( 'apierror-contentserializationexception', 'parseerror' )
                        ] );
                        return;
                    }
                } else {
                    # Otherwise, make a new empty content.
                    $content = $contentHandler->makeEmptyContent();
                }
            }

            // @todo Add support for appending/prepending to the Content interface

            if ( !( $content instanceof TextContent ) ) {
                $modelName = $contentHandler->getModelID();
                $this->dieWithError( [ 'apierror-appendnotsupported', $modelName ] );
            }

            if ( !is_null( $params['section'] ) ) {
                if ( !$contentHandler->supportsSections() ) {
                    $modelName = $contentHandler->getModelID();
                    $this->dieWithError( [ 'apierror-sectionsnotsupported', $modelName ] );
                }

                if ( $params['section'] == 'new' ) {
                    // DWIM if they're trying to prepend/append to a new section.
                    $content = null;
                } else {
                    // Process the content for section edits
                    $section = $params['section'];
                    $content = $content->getSection( $section );

                    if ( !$content ) {
                        $this->dieWithError( [ 'apierror-nosuchsection', wfEscapeWikiText( $section ) ] );
                    }
                }
            }

            if ( !$content ) {
                $text = '';
            } else {
                $text = $content->serialize( $contentFormat );
            }

            $params['text'] = $params['prependtext'] . $text . $params['appendtext'];
            $toMD5 = $params['prependtext'] . $params['appendtext'];
        }

        if ( $params['undo'] > 0 ) {
            if ( $params['undoafter'] > 0 ) {
                if ( $params['undo'] < $params['undoafter'] ) {
                    list( $params['undo'], $params['undoafter'] ) =
                        [ $params['undoafter'], $params['undo'] ];
                }
                $undoafterRev = Revision::newFromId( $params['undoafter'] );
            }
            $undoRev = Revision::newFromId( $params['undo'] );
            if ( is_null( $undoRev ) || $undoRev->isDeleted( RevisionRecord::DELETED_TEXT ) ) {
                $this->dieWithError( [ 'apierror-nosuchrevid', $params['undo'] ] );
            }

            if ( $params['undoafter'] == 0 ) {
                $undoafterRev = $undoRev->getPrevious();
            }
            if ( is_null( $undoafterRev ) || $undoafterRev->isDeleted( RevisionRecord::DELETED_TEXT ) ) {
                $this->dieWithError( [ 'apierror-nosuchrevid', $params['undoafter'] ] );
            }

            if ( $undoRev->getPage() != $pageObj->getId() ) {
                $this->dieWithError( [ 'apierror-revwrongpage', $undoRev->getId(),
                    $titleObj->getPrefixedText() ] );
            }
            if ( $undoafterRev->getPage() != $pageObj->getId() ) {
                $this->dieWithError( [ 'apierror-revwrongpage', $undoafterRev->getId(),
                    $titleObj->getPrefixedText() ] );
            }

            $newContent = $contentHandler->getUndoContent(
                $pageObj->getRevision(),
                $undoRev,
                $undoafterRev
            );

            if ( !$newContent ) {
                $this->dieWithError( 'undo-failure', 'undofailure' );
            }
            if ( empty( $params['contentmodel'] )
                && empty( $params['contentformat'] )
            ) {
                // If we are reverting content model, the new content model
                // might not support the current serialization format, in
                // which case go back to the old serialization format,
                // but only if the user hasn't specified a format/model
                // parameter.
                if ( !$newContent->isSupportedFormat( $contentFormat ) ) {
                    $contentFormat = $undoafterRev->getContentFormat();
                }
                // Override content model with model of undid revision.
                $contentModel = $newContent->getModel();
            }
            $params['text'] = $newContent->serialize( $contentFormat );
            // If no summary was given and we only undid one rev,
            // use an autosummary
            if ( is_null( $params['summary'] ) &&
                $titleObj->getNextRevisionID( $undoafterRev->getId() ) == $params['undo']
            ) {
                $params['summary'] = wfMessage( 'undo-summary' )
                    ->params( $params['undo'], $undoRev->getUserText() )->inContentLanguage()->text();
            }
        }

        // See if the MD5 hash checks out
        if ( !is_null( $params['md5'] ) && md5( $toMD5 ) !== $params['md5'] ) {
            $this->dieWithError( 'apierror-badmd5' );
        }

        // EditPage wants to parse its stuff from a WebRequest
        // That interface kind of sucks, but it's workable
        $requestArray = [
            'wpTextbox1' => $params['text'],
            'format' => $contentFormat,
            'model' => $contentModel,
            'wpEditToken' => $params['token'],
            'wpIgnoreBlankSummary' => true,
            'wpIgnoreBlankArticle' => true,
            'wpIgnoreSelfRedirect' => true,
            'bot' => $params['bot'],
            'wpUnicodeCheck' => EditPage::UNICODE_CHECK,
        ];

        if ( !is_null( $params['summary'] ) ) {
            $requestArray['wpSummary'] = $params['summary'];
        }

        if ( !is_null( $params['sectiontitle'] ) ) {
            $requestArray['wpSectionTitle'] = $params['sectiontitle'];
        }

        // TODO: Pass along information from 'undoafter' as well
        if ( $params['undo'] > 0 ) {
            $requestArray['wpUndidRevision'] = $params['undo'];
        }

        // Watch out for basetimestamp == '' or '0'
        // It gets treated as NOW, almost certainly causing an edit conflict
        if ( $params['basetimestamp'] !== null && (bool)$this->getMain()->getVal( 'basetimestamp' ) ) {
            $requestArray['wpEdittime'] = $params['basetimestamp'];
        } else {
            $requestArray['wpEdittime'] = $pageObj->getTimestamp();
        }

        if ( $params['starttimestamp'] !== null ) {
            $requestArray['wpStarttime'] = $params['starttimestamp'];
        } else {
            $requestArray['wpStarttime'] = wfTimestampNow(); // Fake wpStartime
        }

        if ( $params['minor'] || ( !$params['notminor'] && $user->getOption( 'minordefault' ) ) ) {
            $requestArray['wpMinoredit'] = '';
        }

        if ( $params['recreate'] ) {
            $requestArray['wpRecreate'] = '';
        }

        if ( !is_null( $params['section'] ) ) {
            $section = $params['section'];
            if ( !preg_match( '/^((T-)?\d+|new)$/', $section ) ) {
                $this->dieWithError( 'apierror-invalidsection' );
            }
            $content = $pageObj->getContent();
            if ( $section !== '0' && $section != 'new'
                && ( !$content || !$content->getSection( $section ) )
            ) {
                $this->dieWithError( [ 'apierror-nosuchsection', $section ] );
            }
            $requestArray['wpSection'] = $params['section'];
        } else {
            $requestArray['wpSection'] = '';
        }

        $watch = $this->getWatchlistValue( $params['watchlist'], $titleObj );

        // Deprecated parameters
        if ( $params['watch'] ) {
            $watch = true;
        } elseif ( $params['unwatch'] ) {
            $watch = false;
        }

        if ( $watch ) {
            $requestArray['wpWatchthis'] = '';
        }

        // Apply change tags
        if ( $params['tags'] ) {
            $tagStatus = ChangeTags::canAddTagsAccompanyingChange( $params['tags'], $user );
            if ( $tagStatus->isOK() ) {
                $requestArray['wpChangeTags'] = implode( ',', $params['tags'] );
            } else {
                $this->dieStatus( $tagStatus );
            }
        }

        // Pass through anything else we might have been given, to support extensions
        // This is kind of a hack but it's the best we can do to make extensions work
        $requestArray += $this->getRequest()->getValues();

        global $wgTitle, $wgRequest;

        $req = new DerivativeRequest( $this->getRequest(), $requestArray, true );

        // Some functions depend on $wgTitle == $ep->mTitle
        // TODO: Make them not or check if they still do
        $wgTitle = $titleObj;

        $articleContext = new RequestContext;
        $articleContext->setRequest( $req );
        $articleContext->setWikiPage( $pageObj );
        $articleContext->setUser( $this->getUser() );

        $articleObject = Article::newFromWikiPage( $pageObj, $articleContext );

        $ep = new EditPage( $articleObject );

        $ep->setApiEditOverride( true );
        $ep->setContextTitle( $titleObj );
        $ep->importFormData( $req );
        $content = $ep->textbox1;

        // Do the actual save
        $oldRevId = $articleObject->getRevIdFetched();
        $result = null;
        // Fake $wgRequest for some hooks inside EditPage
        // @todo FIXME: This interface SUCKS
        $oldRequest = $wgRequest;
        $wgRequest = $req;

        $status = $ep->attemptSave( $result );
        $wgRequest = $oldRequest;

        switch ( $status->value ) {
            case EditPage::AS_HOOK_ERROR:
            case EditPage::AS_HOOK_ERROR_EXPECTED:
                if ( isset( $status->apiHookResult ) ) {
                    $r = $status->apiHookResult;
                    $r['result'] = 'Failure';
                    $apiResult->addValue( null, $this->getModuleName(), $r );
                    return;
                }
                if ( !$status->getErrors() ) {
                    // This appears to be unreachable right now, because all
                    // code paths will set an error.  Could change, though.
                    $status->fatal( 'hookaborted' ); //@codeCoverageIgnore
                }
                $this->dieStatus( $status );

            // These two cases will normally have been caught earlier, and will
            // only occur if something blocks the user between the earlier
            // check and the check in EditPage (presumably a hook).  It's not
            // obvious that this is even possible.
            // @codeCoverageIgnoreStart
            case EditPage::AS_BLOCKED_PAGE_FOR_USER:
                $this->dieBlocked( $user->getBlock() );

            case EditPage::AS_READ_ONLY_PAGE:
                $this->dieReadOnly();
            // @codeCoverageIgnoreEnd

            case EditPage::AS_SUCCESS_NEW_ARTICLE:
                $r['new'] = true;
                // fall-through

            case EditPage::AS_SUCCESS_UPDATE:
                $r['result'] = 'Success';
                $r['pageid'] = (int)$titleObj->getArticleID();
                $r['title'] = $titleObj->getPrefixedText();
                $r['contentmodel'] = $articleObject->getContentModel();
                $newRevId = $articleObject->getLatest();
                if ( $newRevId == $oldRevId ) {
                    $r['nochange'] = true;
                } else {
                    $r['oldrevid'] = (int)$oldRevId;
                    $r['newrevid'] = (int)$newRevId;
                    $r['newtimestamp'] = wfTimestamp( TS_ISO_8601,
                        $pageObj->getTimestamp() );
                }
                break;

            default:
                if ( !$status->getErrors() ) {
                    // EditPage sometimes only sets the status code without setting
                    // any actual error messages. Supply defaults for those cases.
                    switch ( $status->value ) {
                        // Currently needed
                        case EditPage::AS_IMAGE_REDIRECT_ANON:
                            $status->fatal( 'apierror-noimageredirect-anon' );
                            break;
                        case EditPage::AS_IMAGE_REDIRECT_LOGGED:
                            $status->fatal( 'apierror-noimageredirect' );
                            break;
                        case EditPage::AS_CONTENT_TOO_BIG:
                        case EditPage::AS_MAX_ARTICLE_SIZE_EXCEEDED:
                            $status->fatal( 'apierror-contenttoobig', $this->getConfig()->get( 'MaxArticleSize' ) );
                            break;
                        case EditPage::AS_READ_ONLY_PAGE_ANON:
                            $status->fatal( 'apierror-noedit-anon' );
                            break;
                        case EditPage::AS_NO_CHANGE_CONTENT_MODEL:
                            $status->fatal( 'apierror-cantchangecontentmodel' );
                            break;
                        case EditPage::AS_ARTICLE_WAS_DELETED:
                            $status->fatal( 'apierror-pagedeleted' );
                            break;
                        case EditPage::AS_CONFLICT_DETECTED:
                            $status->fatal( 'editconflict' );
                            break;

                        // Currently shouldn't be needed, but here in case
                        // hooks use them without setting appropriate
                        // errors on the status.
                        // @codeCoverageIgnoreStart
                        case EditPage::AS_SPAM_ERROR:
                            $status->fatal( 'apierror-spamdetected', $result['spam'] );
                            break;
                        case EditPage::AS_READ_ONLY_PAGE_LOGGED:
                            $status->fatal( 'apierror-noedit' );
                            break;
                        case EditPage::AS_RATE_LIMITED:
                            $status->fatal( 'apierror-ratelimited' );
                            break;
                        case EditPage::AS_NO_CREATE_PERMISSION:
                            $status->fatal( 'nocreate-loggedin' );
                            break;
                        case EditPage::AS_BLANK_ARTICLE:
                            $status->fatal( 'apierror-emptypage' );
                            break;
                        case EditPage::AS_TEXTBOX_EMPTY:
                            $status->fatal( 'apierror-emptynewsection' );
                            break;
                        case EditPage::AS_SUMMARY_NEEDED:
                            $status->fatal( 'apierror-summaryrequired' );
                            break;
                        default:
                            wfWarn( __METHOD__ . ": Unknown EditPage code {$status->value} with no message" );
                            $status->fatal( 'apierror-unknownerror-editpage', $status->value );
                            break;
                        // @codeCoverageIgnoreEnd
                    }
                }
                $this->dieStatus( $status );
        }
        $apiResult->addValue( null, $this->getModuleName(), $r );
    }

    public function mustBePosted() {
        return true;
    }

    public function isWriteMode() {
        return true;
    }

    public function getAllowedParams() {
        return [
            'title' => [
                ApiBase::PARAM_TYPE => 'string',
            ],
            'pageid' => [
                ApiBase::PARAM_TYPE => 'integer',
            ],
            'section' => null,
            'sectiontitle' => [
                ApiBase::PARAM_TYPE => 'string',
            ],
            'text' => [
                ApiBase::PARAM_TYPE => 'text',
            ],
            'summary' => null,
            'tags' => [
                ApiBase::PARAM_TYPE => 'tags',
                ApiBase::PARAM_ISMULTI => true,
            ],
            'minor' => false,
            'notminor' => false,
            'bot' => false,
            'basetimestamp' => [
                ApiBase::PARAM_TYPE => 'timestamp',
            ],
            'starttimestamp' => [
                ApiBase::PARAM_TYPE => 'timestamp',
            ],
            'recreate' => false,
            'createonly' => false,
            'nocreate' => false,
            'watch' => [
                ApiBase::PARAM_DFLT => false,
                ApiBase::PARAM_DEPRECATED => true,
            ],
            'unwatch' => [
                ApiBase::PARAM_DFLT => false,
                ApiBase::PARAM_DEPRECATED => true,
            ],
            'watchlist' => [
                ApiBase::PARAM_DFLT => 'preferences',
                ApiBase::PARAM_TYPE => [
                    'watch',
                    'unwatch',
                    'preferences',
                    'nochange'
                ],
            ],
            'md5' => null,
            'prependtext' => [
                ApiBase::PARAM_TYPE => 'text',
            ],
            'appendtext' => [
                ApiBase::PARAM_TYPE => 'text',
            ],
            'undo' => [
                ApiBase::PARAM_TYPE => 'integer',
                ApiBase::PARAM_MIN => 0,
                ApiBase::PARAM_RANGE_ENFORCE => true,
            ],
            'undoafter' => [
                ApiBase::PARAM_TYPE => 'integer',
                ApiBase::PARAM_MIN => 0,
                ApiBase::PARAM_RANGE_ENFORCE => true,
            ],
            'redirect' => [
                ApiBase::PARAM_TYPE => 'boolean',
                ApiBase::PARAM_DFLT => false,
            ],
            'contentformat' => [
                ApiBase::PARAM_TYPE => ContentHandler::getAllContentFormats(),
            ],
            'contentmodel' => [
                ApiBase::PARAM_TYPE => ContentHandler::getContentModels(),
            ],
            'token' => [
                // Standard definition automatically inserted
                ApiBase::PARAM_HELP_MSG_APPEND => [ 'apihelp-edit-param-token' ],
            ],
        ];
    }

    public function needsToken() {
        return 'csrf';
    }

    protected function getExamplesMessages() {
        return [
            'action=edit&title=Test&summary=test%20summary&' .
                'text=article%20content&basetimestamp=2007-08-24T12:34:54Z&token=123ABC'
                => 'apihelp-edit-example-edit',
            'action=edit&title=Test&summary=NOTOC&minor=&' .
                'prependtext=__NOTOC__%0A&basetimestamp=2007-08-24T12:34:54Z&token=123ABC'
                => 'apihelp-edit-example-prepend',
            'action=edit&title=Test&undo=13585&undoafter=13579&' .
                'basetimestamp=2007-08-24T12:34:54Z&token=123ABC'
                => 'apihelp-edit-example-undo',
        ];
    }

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