ApiQueryAllMessages.php

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<?php
use MediaWiki\MediaWikiServices;

class ApiQueryAllMessages extends ApiQueryBase {

    public function __construct( ApiQuery $query, $moduleName ) {
        parent::__construct( $query, $moduleName, 'am' );
    }

    public function execute() {
        $params = $this->extractRequestParams();

        if ( is_null( $params['lang'] ) ) {
            $langObj = $this->getLanguage();
        } elseif ( !Language::isValidCode( $params['lang'] ) ) {
            $this->dieWithError(
                [ 'apierror-invalidlang', $this->encodeParamName( 'lang' ) ], 'invalidlang'
            );
        } else {
            $langObj = Language::factory( $params['lang'] );
        }

        if ( $params['enableparser'] ) {
            if ( !is_null( $params['title'] ) ) {
                $title = Title::newFromText( $params['title'] );
                if ( !$title || $title->isExternal() ) {
                    $this->dieWithError( [ 'apierror-invalidtitle', wfEscapeWikiText( $params['title'] ) ] );
                }
            } else {
                $title = Title::newFromText( 'API' );
            }
        }

        $prop = array_flip( (array)$params['prop'] );

        // Determine which messages should we print
        if ( in_array( '*', $params['messages'] ) ) {
            $message_names = Language::getMessageKeysFor( $langObj->getCode() );
            if ( $params['includelocal'] ) {
                $message_names = array_unique( array_merge(
                    $message_names,
                    // Pass in the content language code so we get local messages that have a
                    // MediaWiki:msgkey page. We might theoretically miss messages that have no
                    // MediaWiki:msgkey page but do have a MediaWiki:msgkey/lang page, but that's
                    // just a stupid case.
                    MessageCache::singleton()->getAllMessageKeys( $this->getConfig()->get( 'LanguageCode' ) )
                ) );
            }
            sort( $message_names );
            $messages_target = $message_names;
        } else {
            $messages_target = $params['messages'];
        }

        // Filter messages that have the specified prefix
        // Because we sorted the message array earlier, they will appear in a clump:
        if ( isset( $params['prefix'] ) ) {
            $skip = false;
            $messages_filtered = [];
            foreach ( $messages_target as $message ) {
                // === 0: must be at beginning of string (position 0)
                if ( strpos( $message, $params['prefix'] ) === 0 ) {
                    if ( !$skip ) {
                        $skip = true;
                    }
                    $messages_filtered[] = $message;
                } elseif ( $skip ) {
                    break;
                }
            }
            $messages_target = $messages_filtered;
        }

        // Filter messages that contain specified string
        if ( isset( $params['filter'] ) ) {
            $messages_filtered = [];
            foreach ( $messages_target as $message ) {
                // !== is used because filter can be at the beginning of the string
                if ( strpos( $message, $params['filter'] ) !== false ) {
                    $messages_filtered[] = $message;
                }
            }
            $messages_target = $messages_filtered;
        }

        // Whether we have any sort of message customisation filtering
        $customiseFilterEnabled = $params['customised'] !== 'all';
        if ( $customiseFilterEnabled ) {
            $customisedMessages = AllMessagesTablePager::getCustomisedStatuses(
                array_map(
                    [ $langObj, 'ucfirst' ],
                    $messages_target
                ),
                $langObj->getCode(),
                !$langObj->equals( MediaWikiServices::getInstance()->getContentLanguage() )
            );

            $customised = $params['customised'] === 'modified';
        }

        // Get all requested messages and print the result
        $skip = !is_null( $params['from'] );
        $useto = !is_null( $params['to'] );
        $result = $this->getResult();
        foreach ( $messages_target as $message ) {
            // Skip all messages up to $params['from']
            if ( $skip && $message === $params['from'] ) {
                $skip = false;
            }

            if ( $useto && $message > $params['to'] ) {
                break;
            }

            if ( !$skip ) {
                $a = [
                    'name' => $message,
                    'normalizedname' => MessageCache::normalizeKey( $message ),
                ];

                $args = [];
                if ( isset( $params['args'] ) && count( $params['args'] ) != 0 ) {
                    $args = $params['args'];
                }

                if ( $customiseFilterEnabled ) {
                    $messageIsCustomised = isset( $customisedMessages['pages'][$langObj->ucfirst( $message )] );
                    if ( $customised === $messageIsCustomised ) {
                        if ( $customised ) {
                            $a['customised'] = true;
                        }
                    } else {
                        continue;
                    }
                }

                $msg = wfMessage( $message, $args )->inLanguage( $langObj );

                if ( !$msg->exists() ) {
                    $a['missing'] = true;
                } else {
                    // Check if the parser is enabled:
                    if ( $params['enableparser'] ) {
                        $msgString = $msg->title( $title )->text();
                    } else {
                        $msgString = $msg->plain();
                    }
                    if ( !$params['nocontent'] ) {
                        ApiResult::setContentValue( $a, 'content', $msgString );
                    }
                    if ( isset( $prop['default'] ) ) {
                        $default = wfMessage( $message )->inLanguage( $langObj )->useDatabase( false );
                        if ( !$default->exists() ) {
                            $a['defaultmissing'] = true;
                        } elseif ( $default->plain() != $msgString ) {
                            $a['default'] = $default->plain();
                        }
                    }
                }
                $fit = $result->addValue( [ 'query', $this->getModuleName() ], null, $a );
                if ( !$fit ) {
                    $this->setContinueEnumParameter( 'from', $message );
                    break;
                }
            }
        }
        $result->addIndexedTagName( [ 'query', $this->getModuleName() ], 'message' );
    }

    public function getCacheMode( $params ) {
        if ( is_null( $params['lang'] ) ) {
            // Language not specified, will be fetched from preferences
            return 'anon-public-user-private';
        } elseif ( $params['enableparser'] ) {
            // User-specific parser options will be used
            return 'anon-public-user-private';
        } else {
            // OK to cache
            return 'public';
        }
    }

    public function getAllowedParams() {
        return [
            'messages' => [
                ApiBase::PARAM_DFLT => '*',
                ApiBase::PARAM_ISMULTI => true,
            ],
            'prop' => [
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => [
                    'default'
                ]
            ],
            'enableparser' => false,
            'nocontent' => false,
            'includelocal' => false,
            'args' => [
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_ALLOW_DUPLICATES => true,
            ],
            'filter' => [],
            'customised' => [
                ApiBase::PARAM_DFLT => 'all',
                ApiBase::PARAM_TYPE => [
                    'all',
                    'modified',
                    'unmodified'
                ]
            ],
            'lang' => null,
            'from' => null,
            'to' => null,
            'title' => null,
            'prefix' => null,
        ];
    }

    protected function getExamplesMessages() {
        return [
            'action=query&meta=allmessages&amprefix=ipb-'
                => 'apihelp-query+allmessages-example-ipb',
            'action=query&meta=allmessages&ammessages=august|mainpage&amlang=de'
                => 'apihelp-query+allmessages-example-de',
        ];
    }

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