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[mediawiki.git] / includes / upload / UploadFromUrl.php

<?php
/**
 * Backend for uploading files from a HTTP resource.
 *
 * 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 Upload
 */

/**
 * Implements uploading from a HTTP resource.
 *
 * @ingroup Upload
 * @author Bryan Tong Minh
 * @author Michael Dale
 */
class UploadFromUrl extends UploadBase {
        protected $mAsync, $mUrl;
        protected $mIgnoreWarnings = true;

        protected $mTempPath, $mTmpHandle;

        protected static $allowedUrls = array();

        /**
         * Checks if the user is allowed to use the upload-by-URL feature. If the
         * user is not allowed, return the name of the user right as a string. If
         * the user is allowed, have the parent do further permissions checking.
         *
         * @param User $user
         *
         * @return bool|string
         */
        public static function isAllowed( $user ) {
                if ( !$user->isAllowed( 'upload_by_url' ) ) {
                        return 'upload_by_url';
                }

                return parent::isAllowed( $user );
        }

        /**
         * Checks if the upload from URL feature is enabled
         * @return bool
         */
        public static function isEnabled() {
                global $wgAllowCopyUploads;

                return $wgAllowCopyUploads && parent::isEnabled();
        }

        /**
         * Checks whether the URL is for an allowed host
         * The domains in the whitelist can include wildcard characters (*) in place
         * of any of the domain levels, e.g. '*.flickr.com' or 'upload.*.gov.uk'.
         *
         * @param string $url
         * @return bool
         */
        public static function isAllowedHost( $url ) {
                global $wgCopyUploadsDomains;
                if ( !count( $wgCopyUploadsDomains ) ) {
                        return true;
                }
                $parsedUrl = wfParseUrl( $url );
                if ( !$parsedUrl ) {
                        return false;
                }
                $valid = false;
                foreach ( $wgCopyUploadsDomains as $domain ) {
                        // See if the domain for the upload matches this whitelisted domain
                        $whitelistedDomainPieces = explode( '.', $domain );
                        $uploadDomainPieces = explode( '.', $parsedUrl['host'] );
                        if ( count( $whitelistedDomainPieces ) === count( $uploadDomainPieces ) ) {
                                $valid = true;
                                // See if all the pieces match or not (excluding wildcards)
                                foreach ( $whitelistedDomainPieces as $index => $piece ) {
                                        if ( $piece !== '*' && $piece !== $uploadDomainPieces[$index] ) {
                                                $valid = false;
                                        }
                                }
                                if ( $valid ) {
                                        // We found a match, so quit comparing against the list
                                        break;
                                }
                        }
                        /* Non-wildcard test
                        if ( $parsedUrl['host'] === $domain ) {
                                $valid = true;
                                break;
                        }
                        */
                }

                return $valid;
        }

        /**
         * Checks whether the URL is not allowed.
         *
         * @param string $url
         * @return bool
         */
        public static function isAllowedUrl( $url ) {
                if ( !isset( self::$allowedUrls[$url] ) ) {
                        $allowed = true;
                        Hooks::run( 'IsUploadAllowedFromUrl', array( $url, &$allowed ) );
                        self::$allowedUrls[$url] = $allowed;
                }

                return self::$allowedUrls[$url];
        }

        /**
         * Entry point for API upload
         *
         * @param string $name
         * @param string $url
         * @param bool|string $async Whether the download should be performed
         * asynchronous. False for synchronous, async or async-leavemessage for
         * asynchronous download.
         * @throws MWException
         */
        public function initialize( $name, $url, $async = false ) {
                global $wgAllowAsyncCopyUploads;

                $this->mUrl = $url;
                $this->mAsync = $wgAllowAsyncCopyUploads ? $async : false;
                if ( $async ) {
                        throw new MWException( 'Asynchronous copy uploads are no longer possible as of r81612.' );
                }

                $tempPath = $this->mAsync ? null : $this->makeTemporaryFile();
                # File size and removeTempFile will be filled in later
                $this->initializePathInfo( $name, $tempPath, 0, false );
        }

        /**
         * Entry point for SpecialUpload
         * @param WebRequest $request
         */
        public function initializeFromRequest( &$request ) {
                $desiredDestName = $request->getText( 'wpDestFile' );
                if ( !$desiredDestName ) {
                        $desiredDestName = $request->getText( 'wpUploadFileURL' );
                }
                $this->initialize(
                        $desiredDestName,
                        trim( $request->getVal( 'wpUploadFileURL' ) ),
                        false
                );
        }

        /**
         * @param WebRequest $request
         * @return bool
         */
        public static function isValidRequest( $request ) {
                global $wgUser;

                $url = $request->getVal( 'wpUploadFileURL' );

                return !empty( $url )
                        && Http::isValidURI( $url )
                        && $wgUser->isAllowed( 'upload_by_url' );
        }

        /**
         * @return string
         */
        public function getSourceType() {
                return 'url';
        }

        /**
         * Download the file (if not async)
         *
         * @param array $httpOptions Array of options for MWHttpRequest. Ignored if async.
         *   This could be used to override the timeout on the http request.
         * @return Status
         */
        public function fetchFile( $httpOptions = array() ) {
                if ( !Http::isValidURI( $this->mUrl ) ) {
                        return Status::newFatal( 'http-invalid-url' );
                }

                if ( !self::isAllowedHost( $this->mUrl ) ) {
                        return Status::newFatal( 'upload-copy-upload-invalid-domain' );
                }
                if ( !self::isAllowedUrl( $this->mUrl ) ) {
                        return Status::newFatal( 'upload-copy-upload-invalid-url' );
                }
                if ( !$this->mAsync ) {
                        return $this->reallyFetchFile( $httpOptions );
                }

                return Status::newGood();
        }

        /**
         * Create a new temporary file in the URL subdirectory of wfTempDir().
         *
         * @return string Path to the file
         */
        protected function makeTemporaryFile() {
                $tmpFile = TempFSFile::factory( 'URL' );
                $tmpFile->bind( $this );

                return $tmpFile->getPath();
        }

        /**
         * Callback: save a chunk of the result of a HTTP request to the temporary file
         *
         * @param mixed $req
         * @param string $buffer
         * @return int Number of bytes handled
         */
        public function saveTempFileChunk( $req, $buffer ) {
                wfDebugLog( 'fileupload', 'Received chunk of ' . strlen( $buffer ) . ' bytes' );
                $nbytes = fwrite( $this->mTmpHandle, $buffer );

                if ( $nbytes == strlen( $buffer ) ) {
                        $this->mFileSize += $nbytes;
                } else {
                        // Well... that's not good!
                        wfDebugLog(
                                'fileupload',
                                'Short write ' . $this->nbytes . '/' . strlen( $buffer ) .
                                        ' bytes, aborting with '  . $this->mFileSize . ' uploaded so far'
                        );
                        fclose( $this->mTmpHandle );
                        $this->mTmpHandle = false;
                }

                return $nbytes;
        }

        /**
         * Download the file, save it to the temporary file and update the file
         * size and set $mRemoveTempFile to true.
         *
         * @param array $httpOptions Array of options for MWHttpRequest
         * @return Status
         */
        protected function reallyFetchFile( $httpOptions = array() ) {
                global $wgCopyUploadProxy, $wgCopyUploadTimeout;
                if ( $this->mTempPath === false ) {
                        return Status::newFatal( 'tmp-create-error' );
                }

                // Note the temporary file should already be created by makeTemporaryFile()
                $this->mTmpHandle = fopen( $this->mTempPath, 'wb' );
                if ( !$this->mTmpHandle ) {
                        return Status::newFatal( 'tmp-create-error' );
                }
                wfDebugLog( 'fileupload', 'Temporary file created "' . $this->mTempPath . '"' );

                $this->mRemoveTempFile = true;
                $this->mFileSize = 0;

                $options = $httpOptions + array( 'followRedirects' => true );

                if ( $wgCopyUploadProxy !== false ) {
                        $options['proxy'] = $wgCopyUploadProxy;
                }

                if ( $wgCopyUploadTimeout && !isset( $options['timeout'] ) ) {
                        $options['timeout'] = $wgCopyUploadTimeout;
                }
                wfDebugLog(
                        'fileupload',
                        'Starting download from "' . $this->mUrl . '" ' .
                                '<' . implode( ',', array_keys( array_filter( $options ) ) ) . '>'
                );
                $req = MWHttpRequest::factory( $this->mUrl, $options, __METHOD__ );
                $req->setCallback( array( $this, 'saveTempFileChunk' ) );
                $status = $req->execute();

                if ( $this->mTmpHandle ) {
                        // File got written ok...
                        fclose( $this->mTmpHandle );
                        $this->mTmpHandle = null;
                } else {
                        // We encountered a write error during the download...
                        return Status::newFatal( 'tmp-write-error' );
                }

                wfDebugLog( 'fileupload', $status );
                if ( $status->isOk() ) {
                        wfDebugLog( 'fileupload', 'Download by URL completed successfuly.' );
                } else {
                        wfDebugLog(
                                'fileupload',
                                'Download by URL completed with HTTP status ' . $req->getStatus()
                        );
                }

                return $status;
        }

        /**
         * Wrapper around the parent function in order to defer verifying the
         * upload until the file really has been fetched.
         * @return array|mixed
         */
        public function verifyUpload() {
                if ( $this->mAsync ) {
                        return array( 'status' => UploadBase::OK );
                }

                return parent::verifyUpload();
        }

        /**
         * Wrapper around the parent function in order to defer checking warnings
         * until the file really has been fetched.
         * @return array
         */
        public function checkWarnings() {
                if ( $this->mAsync ) {
                        $this->mIgnoreWarnings = false;

                        return array();
                }

                return parent::checkWarnings();
        }

        /**
         * Wrapper around the parent function in order to defer checking protection
         * until we are sure that the file can actually be uploaded
         * @param User $user
         * @return bool|mixed
         */
        public function verifyTitlePermissions( $user ) {
                if ( $this->mAsync ) {
                        return true;
                }

                return parent::verifyTitlePermissions( $user );
        }

        /**
         * Wrapper around the parent function in order to defer uploading to the
         * job queue for asynchronous uploads
         * @param string $comment
         * @param string $pageText
         * @param bool $watch
         * @param User $user
         * @return Status
         */
        public function performUpload( $comment, $pageText, $watch, $user ) {
                if ( $this->mAsync ) {
                        $sessionKey = $this->insertJob( $comment, $pageText, $watch, $user );

                        return Status::newFatal( 'async', $sessionKey );
                }

                return parent::performUpload( $comment, $pageText, $watch, $user );
        }

        /**
         * @param string $comment
         * @param string $pageText
         * @param bool $watch
         * @param User $user
         * @return string
         */
        protected function insertJob( $comment, $pageText, $watch, $user ) {
                $sessionKey = $this->stashSession();
                $job = new UploadFromUrlJob( $this->getTitle(), array(
                        'url' => $this->mUrl,
                        'comment' => $comment,
                        'pageText' => $pageText,
                        'watch' => $watch,
                        'userName' => $user->getName(),
                        'leaveMessage' => $this->mAsync == 'async-leavemessage',
                        'ignoreWarnings' => $this->mIgnoreWarnings,
                        'sessionId' => session_id(),
                        'sessionKey' => $sessionKey,
                ) );
                $job->initializeSessionData();
                JobQueueGroup::singleton()->push( $job );

                return $sessionKey;
        }
}