PHP byteserving_send_file函数代码示例

/**
 * Enhanced readfile() with optional acceleration.
 * @param string|stored_file $file
 * @param string $mimetype
 * @param bool $accelerate
 * @return void
 */
function readfile_accel($file, $mimetype, $accelerate)
{
    global $CFG;
    if ($mimetype === 'text/plain') {
        // there is no encoding specified in text files, we need something consistent
        header('Content-Type: text/plain; charset=utf-8');
    } else {
        header('Content-Type: ' . $mimetype);
    }
    $lastmodified = is_object($file) ? $file->get_timemodified() : filemtime($file);
    header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $lastmodified) . ' GMT');
    if (is_object($file)) {
        header('Etag: "' . $file->get_contenthash() . '"');
        if (isset($_SERVER['HTTP_IF_NONE_MATCH']) and trim($_SERVER['HTTP_IF_NONE_MATCH'], '"') === $file->get_contenthash()) {
            header('HTTP/1.1 304 Not Modified');
            return;
        }
    }
    // if etag present for stored file rely on it exclusively
    if (!empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) and (empty($_SERVER['HTTP_IF_NONE_MATCH']) or !is_object($file))) {
        // get unixtime of request header; clip extra junk off first
        $since = strtotime(preg_replace('/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"]));
        if ($since && $since >= $lastmodified) {
            header('HTTP/1.1 304 Not Modified');
            return;
        }
    }
    if ($accelerate and !empty($CFG->xsendfile)) {
        if (empty($CFG->disablebyteserving) and $mimetype !== 'text/plain') {
            header('Accept-Ranges: bytes');
        } else {
            header('Accept-Ranges: none');
        }
        if (is_object($file)) {
            $fs = get_file_storage();
            if ($fs->xsendfile($file->get_contenthash())) {
                return;
            }
        } else {
            require_once "{$CFG->libdir}/xsendfilelib.php";
            if (xsendfile($file)) {
                return;
            }
        }
    }
    $filesize = is_object($file) ? $file->get_filesize() : filesize($file);
    header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $lastmodified) . ' GMT');
    if ($accelerate and empty($CFG->disablebyteserving) and $mimetype !== 'text/plain') {
        header('Accept-Ranges: bytes');
        if (!empty($_SERVER['HTTP_RANGE']) and strpos($_SERVER['HTTP_RANGE'], 'bytes=') !== FALSE) {
            // byteserving stuff - for acrobat reader and download accelerators
            // see: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35
            // inspired by: http://www.coneural.org/florian/papers/04_byteserving.php
            $ranges = false;
            if (preg_match_all('/(\\d*)-(\\d*)/', $_SERVER['HTTP_RANGE'], $ranges, PREG_SET_ORDER)) {
                foreach ($ranges as $key => $value) {
                    if ($ranges[$key][1] == '') {
                        //suffix case
                        $ranges[$key][1] = $filesize - $ranges[$key][2];
                        $ranges[$key][2] = $filesize - 1;
                    } else {
                        if ($ranges[$key][2] == '' || $ranges[$key][2] > $filesize - 1) {
                            //fix range length
                            $ranges[$key][2] = $filesize - 1;
                        }
                    }
                    if ($ranges[$key][2] != '' && $ranges[$key][2] < $ranges[$key][1]) {
                        //invalid byte-range ==> ignore header
                        $ranges = false;
                        break;
                    }
                    //prepare multipart header
                    $ranges[$key][0] = "\r\n--" . BYTESERVING_BOUNDARY . "\r\nContent-Type: {$mimetype}\r\n";
                    $ranges[$key][0] .= "Content-Range: bytes {$ranges[$key][1]}-{$ranges[$key][2]}/{$filesize}\r\n\r\n";
                }
            } else {
                $ranges = false;
            }
            if ($ranges) {
                if (is_object($file)) {
                    $handle = $file->get_content_file_handle();
                } else {
                    $handle = fopen($file, 'rb');
                }
                byteserving_send_file($handle, $mimetype, $ranges, $filesize);
            }
        }
    } else {
        // Do not byteserve
        header('Accept-Ranges: none');
    }
    header('Content-Length: ' . $filesize);
    if ($filesize > 10000000) {
//.........这里部分代码省略.........

/**
 * Serves a file from dataroot.
 *
 * This function checks that the file is inside dataroot, but does not perform
 * any other checks. Authors using this function should make sure that their
 * scripts perform appropriate authentication.
 *
 * As an example: If the file is an artefact, you could ask for an artefact and
 * view ID, and check that the artefact is in the view and that the user can
 * view the view.
 *
 * @param string $path     The file to send. Must include the dataroot path.
 * @param string $filename The name of the file as the browser should use to
 *                         serve it.
 * @param string $mimetype Mime type to be sent in header
 * @param array  $options  Any options to use when serving the file. Currently
 *                         lifetime = 0 for no cache
 *                         forcedownload - force application rather than inline
 *                         overridecontenttype - send this instead of the mimetype
 *                         there are none.
 */
function serve_file($path, $filename, $mimetype, $options = array())
{
    $dataroot = realpath(get_config('dataroot'));
    $path = realpath($path);
    $options = array_merge(array('lifetime' => 86400), $options);
    if (!get_config('insecuredataroot') && substr($path, 0, strlen($dataroot)) != $dataroot) {
        throw new AccessDeniedException();
    }
    if (!file_exists($path)) {
        throw new NotFoundException();
    }
    session_write_close();
    // unlock session during fileserving
    $lastmodified = filemtime($path);
    $filesize = filesize($path);
    if ($mimetype == 'text/html' || $mimetype == 'text/xml' || $mimetype == 'application/xml' || $mimetype == 'application/xhtml+xml' || $mimetype == 'image/svg+xml') {
        if (isset($options['downloadurl']) && $filesize < 1024 * 1024) {
            display_cleaned_html(file_get_contents($path), $filename, $options);
            exit;
        }
        $options['forcedownload'] = true;
        $mimetype = 'application/octet-stream';
    }
    if (!$mimetype) {
        $mimetype = 'application/forcedownload';
    }
    if (ini_get('zlib.output_compression')) {
        ini_set('zlib.output_compression', 'Off');
    }
    // Try to disable automatic sid rewrite in cookieless mode
    @ini_set('session.use_trans_sid', 'false');
    header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $lastmodified) . ' GMT');
    // @todo possibly need addslashes on the filename, but I'm unsure on exactly
    // how the browsers will handle it.
    if ($mimetype == 'application/forcedownload' || isset($options['forcedownload'])) {
        header('Content-Disposition: attachment; filename="' . $filename . '"');
    } else {
        header('Content-Disposition: inline; filename="' . $filename . '"');
    }
    header('X-Content-Type-Options: nosniff');
    if ($options['lifetime'] > 0 && !get_config('nocache')) {
        header('Cache-Control: max-age=' . $options['lifetime']);
        header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $options['lifetime']) . ' GMT');
        header('Pragma: ');
        if ($mimetype != 'text/plain' && $mimetype != 'text/html' && !isset($fileoutput)) {
            @header('Accept-Ranges: bytes');
            if (!empty($_SERVER['HTTP_RANGE']) && strpos($_SERVER['HTTP_RANGE'], 'bytes=') !== FALSE) {
                // Byteserving stuff - for Acrobat Reader and download accelerators
                // see: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35
                // inspired by: http://www.coneural.org/florian/papers/04_byteserving.php
                $ranges = false;
                if (preg_match_all('/(\\d*)-(\\d*)/', $_SERVER['HTTP_RANGE'], $ranges, PREG_SET_ORDER)) {
                    foreach ($ranges as $key => $value) {
                        if ($ranges[$key][1] == '') {
                            // Suffix case
                            $ranges[$key][1] = $filesize - $ranges[$key][2];
                            $ranges[$key][2] = $filesize - 1;
                        } else {
                            if ($ranges[$key][2] == '' || $ranges[$key][2] > $filesize - 1) {
                                // Fix range length
                                $ranges[$key][2] = $filesize - 1;
                            }
                        }
                        if ($ranges[$key][2] != '' && $ranges[$key][2] < $ranges[$key][1]) {
                            // Invalid byte-range ==> ignore header
                            $ranges = false;
                            break;
                        }
                        // Prepare multipart header
                        $ranges[$key][0] = "\r\n--" . BYTESERVING_BOUNDARY . "\r\nContent-Type: {$mimetype}\r\n";
                        $ranges[$key][0] .= "Content-Range: bytes {$ranges[$key][1]}-{$ranges[$key][2]}/{$filesize}\r\n\r\n";
                    }
                } else {
                    $ranges = false;
                }
                if ($ranges) {
                    byteserving_send_file($path, $mimetype, $ranges);
                }
            }
//.........这里部分代码省略.........

//.........这里部分代码省略.........
        header('Pragma: ');
        if (empty($CFG->disablebyteserving) && $mimetype != 'text/plain' && $mimetype != 'text/html') {
            header('Accept-Ranges: bytes');
            if (!empty($_SERVER['HTTP_RANGE']) && strpos($_SERVER['HTTP_RANGE'], 'bytes=') !== FALSE) {
                // byteserving stuff - for acrobat reader and download accelerators
                // see: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35
                // inspired by: http://www.coneural.org/florian/papers/04_byteserving.php
                $ranges = false;
                if (preg_match_all('/(\\d*)-(\\d*)/', $_SERVER['HTTP_RANGE'], $ranges, PREG_SET_ORDER)) {
                    foreach ($ranges as $key => $value) {
                        if ($ranges[$key][1] == '') {
                            //suffix case
                            $ranges[$key][1] = $filesize - $ranges[$key][2];
                            $ranges[$key][2] = $filesize - 1;
                        } else {
                            if ($ranges[$key][2] == '' || $ranges[$key][2] > $filesize - 1) {
                                //fix range length
                                $ranges[$key][2] = $filesize - 1;
                            }
                        }
                        if ($ranges[$key][2] != '' && $ranges[$key][2] < $ranges[$key][1]) {
                            //invalid byte-range ==> ignore header
                            $ranges = false;
                            break;
                        }
                        //prepare multipart header
                        $ranges[$key][0] = "\r\n--" . BYTESERVING_BOUNDARY . "\r\nContent-Type: {$mimetype}\r\n";
                        $ranges[$key][0] .= "Content-Range: bytes {$ranges[$key][1]}-{$ranges[$key][2]}/{$filesize}\r\n\r\n";
                    }
                } else {
                    $ranges = false;
                }
                if ($ranges) {
                    byteserving_send_file($stored_file->get_content_file_handle(), $mimetype, $ranges, $filesize);
                }
            }
        } else {
            /// Do not byteserve (disabled, strings, text and html files).
            header('Accept-Ranges: none');
        }
    } else {
        // Do not cache files in proxies and browsers
        if (strpos($CFG->wwwroot, 'https://') === 0) {
            //https sites - watch out for IE! KB812935 and KB316431
            header('Cache-Control: max-age=10');
            header('Expires: ' . gmdate('D, d M Y H:i:s', 0) . ' GMT');
            header('Pragma: ');
        } else {
            //normal http - prevent caching at all cost
            header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
            header('Expires: ' . gmdate('D, d M Y H:i:s', 0) . ' GMT');
            header('Pragma: no-cache');
        }
        header('Accept-Ranges: none');
        // Do not allow byteserving when caching disabled
    }
    if (empty($filter)) {
        $filtered = false;
        if ($mimetype == 'text/html' && !empty($CFG->usesid)) {
            //cookieless mode - rewrite links
            header('Content-Type: text/html');
            $text = $stored_file->get_content();
            $text = sid_ob_rewrite($text);
            $filesize = strlen($text);
            $filtered = true;
        } else {

//.........这里部分代码省略.........
        @header('Pragma: ');
        if (empty($CFG->disablebyteserving) && !$pathisstring && $mimetype != 'text/plain' && $mimetype != 'text/html') {
            @header('Accept-Ranges: bytes');
            if (!empty($_SERVER['HTTP_RANGE']) && strpos($_SERVER['HTTP_RANGE'], 'bytes=') !== FALSE) {
                // byteserving stuff - for acrobat reader and download accelerators
                // see: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35
                // inspired by: http://www.coneural.org/florian/papers/04_byteserving.php
                $ranges = false;
                if (preg_match_all('/(\\d*)-(\\d*)/', $_SERVER['HTTP_RANGE'], $ranges, PREG_SET_ORDER)) {
                    foreach ($ranges as $key => $value) {
                        if ($ranges[$key][1] == '') {
                            //suffix case
                            $ranges[$key][1] = $filesize - $ranges[$key][2];
                            $ranges[$key][2] = $filesize - 1;
                        } else {
                            if ($ranges[$key][2] == '' || $ranges[$key][2] > $filesize - 1) {
                                //fix range length
                                $ranges[$key][2] = $filesize - 1;
                            }
                        }
                        if ($ranges[$key][2] != '' && $ranges[$key][2] < $ranges[$key][1]) {
                            //invalid byte-range ==> ignore header
                            $ranges = false;
                            break;
                        }
                        //prepare multipart header
                        $ranges[$key][0] = "\r\n--" . BYTESERVING_BOUNDARY . "\r\nContent-Type: {$mimetype}\r\n";
                        $ranges[$key][0] .= "Content-Range: bytes {$ranges[$key][1]}-{$ranges[$key][2]}/{$filesize}\r\n\r\n";
                    }
                } else {
                    $ranges = false;
                }
                if ($ranges) {
                    byteserving_send_file($path, $mimetype, $ranges);
                }
            }
        } else {
            /// Do not byteserve (disabled, strings, text and html files).
            @header('Accept-Ranges: none');
        }
    } else {
        // Do not cache files in proxies and browsers
        if (strpos($CFG->wwwroot, 'https://') === 0) {
            //https sites - watch out for IE! KB812935 and KB316431
            @header('Cache-Control: max-age=10');
            @header('Expires: ' . gmdate('D, d M Y H:i:s', 0) . ' GMT');
            @header('Pragma: ');
        } else {
            //normal http - prevent caching at all cost
            @header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
            @header('Expires: ' . gmdate('D, d M Y H:i:s', 0) . ' GMT');
            @header('Pragma: no-cache');
        }
        @header('Accept-Ranges: none');
        // Do not allow byteserving when caching disabled
    }
    if (empty($filter)) {
        if ($mimetype == 'text/html' && !empty($CFG->usesid) && empty($_COOKIE['MoodleSession' . $CFG->sessioncookie])) {
            //cookieless mode - rewrite links
            @header('Content-Type: text/html');
            $path = $pathisstring ? $path : implode('', file($path));
            $path = sid_ob_rewrite($path);
            $filesize = strlen($path);
            $pathisstring = true;
        } else {
            if ($mimetype == 'text/plain') {