In MediaWikiTestCase::stashMwGlobals(), prefer shallow copies

[mediawiki.git] / includes / Status.php

<?php
/**
 * Generic operation result.
 *
 * 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
 */

/**
 * Generic operation result class
 * Has warning/error list, boolean status and arbitrary value
 *
 * "Good" means the operation was completed with no warnings or errors.
 *
 * "OK" means the operation was partially or wholly completed.
 *
 * An operation which is not OK should have errors so that the user can be
 * informed as to what went wrong. Calling the fatal() function sets an error
 * message and simultaneously switches off the OK flag.
 *
 * The recommended pattern for Status objects is to return a Status object
 * unconditionally, i.e. both on success and on failure -- so that the
 * developer of the calling code is reminded that the function can fail, and
 * so that a lack of error-handling will be explicit.
 */
class Status {
        /** @var StatusValue */
        protected $sv;

        /** @var mixed */
        public $value;
        /** @var array Map of (key => bool) to indicate success of each part of batch operations */
        public $success = [];
        /** @var int Counter for batch operations */
        public $successCount = 0;
        /** @var int Counter for batch operations */
        public $failCount = 0;

        /** @var callable */
        public $cleanCallback = false;

        /**
         * @param StatusValue $sv [optional]
         */
        public function __construct( StatusValue $sv = null ) {
                $this->sv = ( $sv === null ) ? new StatusValue() : $sv;
                // B/C field aliases
                $this->value =& $this->sv->value;
                $this->successCount =& $this->sv->successCount;
                $this->failCount =& $this->sv->failCount;
                $this->success =& $this->sv->success;
        }

        /**
         * Succinct helper method to wrap a StatusValue
         *
         * This is is useful when formatting StatusValue objects:
         * @code
         *     $this->getOutput()->addHtml( Status::wrap( $sv )->getHTML() );
         * @endcode
         *
         * @param StatusValue|Status $sv
         * @return Status
         */
        public static function wrap( $sv ) {
                return $sv instanceof Status ? $sv : new self( $sv );
        }

        /**
         * Factory function for fatal errors
         *
         * @param string|Message $message Message name or object
         * @return Status
         */
        public static function newFatal( $message /*, parameters...*/ ) {
                return new self( call_user_func_array(
                        [ 'StatusValue', 'newFatal' ], func_get_args()
                ) );
        }

        /**
         * Factory function for good results
         *
         * @param mixed $value
         * @return Status
         */
        public static function newGood( $value = null ) {
                $sv = new StatusValue();
                $sv->value = $value;

                return new self( $sv );
        }

        /**
         * Change operation result
         *
         * @param bool $ok Whether the operation completed
         * @param mixed $value
         */
        public function setResult( $ok, $value = null ) {
                $this->sv->setResult( $ok, $value );
        }

        /**
         * Returns the wrapped StatusValue object
         * @return StatusValue
         */
        public function getStatusValue() {
                return $this->sv;
        }

        /**
         * Returns whether the operation completed and didn't have any error or
         * warnings
         *
         * @return bool
         */
        public function isGood() {
                return $this->sv->isGood();
        }

        /**
         * Returns whether the operation completed
         *
         * @return bool
         */
        public function isOK() {
                return $this->sv->isOK();
        }

        /**
         * Add a new warning
         *
         * @param string|Message $message Message name or object
         */
        public function warning( $message /*, parameters... */ ) {
                call_user_func_array( [ $this->sv, 'warning' ], func_get_args() );
        }

        /**
         * Add an error, do not set fatal flag
         * This can be used for non-fatal errors
         *
         * @param string|Message $message Message name or object
         */
        public function error( $message /*, parameters... */ ) {
                call_user_func_array( [ $this->sv, 'error' ], func_get_args() );
        }

        /**
         * Add an error and set OK to false, indicating that the operation
         * as a whole was fatal
         *
         * @param string|Message $message Message name or object
         */
        public function fatal( $message /*, parameters... */ ) {
                call_user_func_array( [ $this->sv, 'fatal' ], func_get_args() );
        }

        /**
         * @param array $params
         * @return array
         */
        protected function cleanParams( array $params ) {
                if ( !$this->cleanCallback ) {
                        return $params;
                }
                $cleanParams = [];
                foreach ( $params as $i => $param ) {
                        $cleanParams[$i] = call_user_func( $this->cleanCallback, $param );
                }
                return $cleanParams;
        }

        /**
         * @param string|Language|null $lang Language to use for processing
         *  messages, or null to default to the user language.
         * @return Language
         */
        protected function languageFromParam( $lang ) {
                global $wgLang;

                if ( $lang === null ) {
                        // @todo: Use RequestContext::getMain()->getLanguage() instead
                        return $wgLang;
                } elseif ( $lang instanceof Language || $lang instanceof StubUserLang ) {
                        return $lang;
                } else {
                        return Language::factory( $lang );
                }
        }

        /**
         * Get the error list as a wikitext formatted list
         *
         * @param string|bool $shortContext A short enclosing context message name, to
         *        be used when there is a single error
         * @param string|bool $longContext A long enclosing context message name, for a list
         * @param string|Language $lang Language to use for processing messages
         * @return string
         */
        public function getWikiText( $shortContext = false, $longContext = false, $lang = null ) {
                $lang = $this->languageFromParam( $lang );

                $rawErrors = $this->sv->getErrors();
                if ( count( $rawErrors ) == 0 ) {
                        if ( $this->sv->isOK() ) {
                                $this->sv->fatal( 'internalerror_info',
                                        __METHOD__ . " called for a good result, this is incorrect\n" );
                        } else {
                                $this->sv->fatal( 'internalerror_info',
                                        __METHOD__ . ": Invalid result object: no error text but not OK\n" );
                        }
                        $rawErrors = $this->sv->getErrors(); // just added a fatal
                }
                if ( count( $rawErrors ) == 1 ) {
                        $s = $this->getErrorMessage( $rawErrors[0], $lang )->plain();
                        if ( $shortContext ) {
                                $s = wfMessage( $shortContext, $s )->inLanguage( $lang )->plain();
                        } elseif ( $longContext ) {
                                $s = wfMessage( $longContext, "* $s\n" )->inLanguage( $lang )->plain();
                        }
                } else {
                        $errors = $this->getErrorMessageArray( $rawErrors, $lang );
                        foreach ( $errors as &$error ) {
                                $error = $error->plain();
                        }
                        $s = '* ' . implode( "\n* ", $errors ) . "\n";
                        if ( $longContext ) {
                                $s = wfMessage( $longContext, $s )->inLanguage( $lang )->plain();
                        } elseif ( $shortContext ) {
                                $s = wfMessage( $shortContext, "\n$s\n" )->inLanguage( $lang )->plain();
                        }
                }
                return $s;
        }

        /**
         * Get the error list as a Message object
         *
         * @param string|string[] $shortContext A short enclosing context message name (or an array of
         * message names), to be used when there is a single error.
         * @param string|string[] $longContext A long enclosing context message name (or an array of
         * message names), for a list.
         * @param string|Language $lang Language to use for processing messages
         * @return Message
         */
        public function getMessage( $shortContext = false, $longContext = false, $lang = null ) {
                $lang = $this->languageFromParam( $lang );

                $rawErrors = $this->sv->getErrors();
                if ( count( $rawErrors ) == 0 ) {
                        if ( $this->sv->isOK() ) {
                                $this->sv->fatal( 'internalerror_info',
                                        __METHOD__ . " called for a good result, this is incorrect\n" );
                        } else {
                                $this->sv->fatal( 'internalerror_info',
                                        __METHOD__ . ": Invalid result object: no error text but not OK\n" );
                        }
                        $rawErrors = $this->sv->getErrors(); // just added a fatal
                }
                if ( count( $rawErrors ) == 1 ) {
                        $s = $this->getErrorMessage( $rawErrors[0], $lang );
                        if ( $shortContext ) {
                                $s = wfMessage( $shortContext, $s )->inLanguage( $lang );
                        } elseif ( $longContext ) {
                                $wrapper = new RawMessage( "* \$1\n" );
                                $wrapper->params( $s )->parse();
                                $s = wfMessage( $longContext, $wrapper )->inLanguage( $lang );
                        }
                } else {
                        $msgs = $this->getErrorMessageArray( $rawErrors, $lang );
                        $msgCount = count( $msgs );

                        if ( $shortContext ) {
                                $msgCount++;
                        }

                        $s = new RawMessage( '* $' . implode( "\n* \$", range( 1, $msgCount ) ) );
                        $s->params( $msgs )->parse();

                        if ( $longContext ) {
                                $s = wfMessage( $longContext, $s )->inLanguage( $lang );
                        } elseif ( $shortContext ) {
                                $wrapper = new RawMessage( "\n\$1\n", [ $s ] );
                                $wrapper->parse();
                                $s = wfMessage( $shortContext, $wrapper )->inLanguage( $lang );
                        }
                }

                return $s;
        }

        /**
         * Return the message for a single error.
         * @param mixed $error With an array & two values keyed by
         * 'message' and 'params', use those keys-value pairs.
         * Otherwise, if its an array, just use the first value as the
         * message and the remaining items as the params.
         * @param string|Language $lang Language to use for processing messages
         * @return Message
         */
        protected function getErrorMessage( $error, $lang = null ) {
                if ( is_array( $error ) ) {
                        if ( isset( $error['message'] ) && $error['message'] instanceof Message ) {
                                $msg = $error['message'];
                        } elseif ( isset( $error['message'] ) && isset( $error['params'] ) ) {
                                $msg = wfMessage( $error['message'],
                                        array_map( 'wfEscapeWikiText', $this->cleanParams( $error['params'] ) ) );
                        } else {
                                $msgName = array_shift( $error );
                                $msg = wfMessage( $msgName,
                                        array_map( 'wfEscapeWikiText', $this->cleanParams( $error ) ) );
                        }
                } else {
                        $msg = wfMessage( $error );
                }

                $msg->inLanguage( $this->languageFromParam( $lang ) );
                return $msg;
        }

        /**
         * Get the error message as HTML. This is done by parsing the wikitext error
         * message.
         * @param string $shortContext A short enclosing context message name, to
         *        be used when there is a single error
         * @param string $longContext A long enclosing context message name, for a list
         * @param string|Language $lang Language to use for processing messages
         * @return string
         */
        public function getHTML( $shortContext = false, $longContext = false, $lang = null ) {
                $lang = $this->languageFromParam( $lang );
                $text = $this->getWikiText( $shortContext, $longContext, $lang );
                $out = MessageCache::singleton()->parse( $text, null, true, true, $lang );
                return $out instanceof ParserOutput ? $out->getText() : $out;
        }

        /**
         * Return an array with a Message object for each error.
         * @param array $errors
         * @param string|Language $lang Language to use for processing messages
         * @return Message[]
         */
        protected function getErrorMessageArray( $errors, $lang = null ) {
                $lang = $this->languageFromParam( $lang );
                return array_map( function ( $e ) use ( $lang ) {
                        return $this->getErrorMessage( $e, $lang );
                }, $errors );
        }

        /**
         * Merge another status object into this one
         *
         * @param Status $other Other Status object
         * @param bool $overwriteValue Whether to override the "value" member
         */
        public function merge( $other, $overwriteValue = false ) {
                $this->sv->merge( $other->sv, $overwriteValue );
        }

        /**
         * Get the list of errors (but not warnings)
         *
         * @return array A list in which each entry is an array with a message key as its first element.
         *         The remaining array elements are the message parameters.
         * @deprecated 1.25
         */
        public function getErrorsArray() {
                return $this->getStatusArray( 'error' );
        }

        /**
         * Get the list of warnings (but not errors)
         *
         * @return array A list in which each entry is an array with a message key as its first element.
         *         The remaining array elements are the message parameters.
         * @deprecated 1.25
         */
        public function getWarningsArray() {
                return $this->getStatusArray( 'warning' );
        }

        /**
         * Returns a list of status messages of the given type (or all if false)
         *
         * @note: this handles RawMessage poorly
         *
         * @param string|bool $type
         * @return array
         */
        protected function getStatusArray( $type = false ) {
                $result = [];

                foreach ( $this->sv->getErrors() as $error ) {
                        if ( $type === false || $error['type'] === $type ) {
                                if ( $error['message'] instanceof MessageSpecifier ) {
                                        $result[] = array_merge(
                                                [ $error['message']->getKey() ],
                                                $error['message']->getParams()
                                        );
                                } elseif ( $error['params'] ) {
                                        $result[] = array_merge( [ $error['message'] ], $error['params'] );
                                } else {
                                        $result[] = [ $error['message'] ];
                                }
                        }
                }

                return $result;
        }

        /**
         * Returns a list of status messages of the given type, with message and
         * params left untouched, like a sane version of getStatusArray
         *
         * Each entry is a map of:
         *   - message: string message key or MessageSpecifier
         *   - params: array list of parameters
         *
         * @param string $type
         * @return array
         */
        public function getErrorsByType( $type ) {
                return $this->sv->getErrorsByType( $type );
        }

        /**
         * Returns true if the specified message is present as a warning or error
         *
         * @param string|Message $message Message key or object to search for
         *
         * @return bool
         */
        public function hasMessage( $message ) {
                return $this->sv->hasMessage( $message );
        }

        /**
         * If the specified source message exists, replace it with the specified
         * destination message, but keep the same parameters as in the original error.
         *
         * Note, due to the lack of tools for comparing Message objects, this
         * function will not work when using a Message object as the search parameter.
         *
         * @param Message|string $source Message key or object to search for
         * @param Message|string $dest Replacement message key or object
         * @return bool Return true if the replacement was done, false otherwise.
         */
        public function replaceMessage( $source, $dest ) {
                return $this->sv->replaceMessage( $source, $dest );
        }

        /**
         * @return mixed
         */
        public function getValue() {
                return $this->sv->getValue();
        }

        /**
         * Backwards compatibility logic
         *
         * @param string $name
         */
        function __get( $name ) {
                if ( $name === 'ok' ) {
                        return $this->sv->isOK();
                } elseif ( $name === 'errors' ) {
                        return $this->sv->getErrors();
                }
                throw new Exception( "Cannot get '$name' property." );
        }

        /**
         * Backwards compatibility logic
         *
         * @param string $name
         * @param mixed $value
         */
        function __set( $name, $value ) {
                if ( $name === 'ok' ) {
                        $this->sv->setOK( $value );
                } elseif ( !property_exists( $this, $name ) ) {
                        // Caller is using undeclared ad-hoc properties
                        $this->$name = $value;
                } else {
                        throw new Exception( "Cannot set '$name' property." );
                }
        }

        /**
         * @return string
         */
        public function __toString() {
                return $this->sv->__toString();
        }

        /**
         * Don't save the callback when serializing, because Closures can't be
         * serialized and we're going to clear it in __wakeup anyway.
         */
        function __sleep() {
                $keys = array_keys( get_object_vars( $this ) );
                return array_diff( $keys, [ 'cleanCallback' ] );
        }

        /**
         * Sanitize the callback parameter on wakeup, to avoid arbitrary execution.
         */
        function __wakeup() {
                $this->cleanCallback = false;
        }
}