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wp-content/plugins/file-manager-advanced/application/class_fma_elfinder_connector.php

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+<?php
+/**
+ * Plugin-level elFinder connector override for stream-safe downloads.
+ *
+ * Keeps vendor library untouched while providing host-compatible output
+ * fallback when fpassthru is unavailable/blocked.
+ */
+
+if (!defined('ABSPATH')) {
+	exit;
+}
+
+if (class_exists('class_fma_elfinder_connector')) {
+	return;
+}
+
+class class_fma_elfinder_connector extends elFinderConnector
+{
+	/**
+	 * Host-safe passthrough fallback.
+	 *
+	 * @param resource $fp File pointer.
+	 * @return void
+	 */
+	protected function fma_stream_passthru($fp)
+	{
+		if (function_exists('fpassthru')) {
+			fpassthru($fp);
+			return;
+		}
+
+		while (!feof($fp)) {
+			$chunk = fread($fp, 8192);
+			if ($chunk === false) {
+				break;
+			}
+			echo $chunk;
+		}
+	}
+
+	/**
+	 * Override only to customize stream output fallback.
+	 *
+	 * @param array $data elFinder response.
+	 * @return void
+	 * @throws elFinderAbortException
+	 */
+	protected function output(array $data)
+	{
+		$this->elFinder->getSession()->close();
+		ignore_user_abort(false);
+
+		if ($this->header) {
+			self::sendHeader($this->header);
+		}
+
+		if (isset($data['pointer'])) {
+			elFinder::extendTimeLimit(0);
+
+			if (!empty($data['header'])) {
+				self::sendHeader($data['header']);
+			}
+
+			while (ob_get_level() && ob_end_clean()) {
+			}
+
+			$toEnd = true;
+			$fp = $data['pointer'];
+			$sendData = !($this->reqMethod === 'HEAD' || !empty($data['info']['xsendfile']));
+			$psize = null;
+			if (($this->reqMethod === 'GET' || !$sendData)
+				&& (elFinder::isSeekableStream($fp) || elFinder::isSeekableUrl($fp))
+				&& (array_search('Accept-Ranges: none', headers_list()) === false)) {
+				header('Accept-Ranges: bytes');
+				if (!empty($_SERVER['HTTP_RANGE'])) {
+					$size = $data['info']['size'];
+					$end = $size - 1;
+					if (preg_match('/bytes=(\d*)-(\d*)(,?)/i', $_SERVER['HTTP_RANGE'], $matches)) {
+						if (empty($matches[3])) {
+							if (empty($matches[1]) && $matches[1] !== '0') {
+								$start = $size - $matches[2];
+							} else {
+								$start = intval($matches[1]);
+								if (!empty($matches[2])) {
+									$end = intval($matches[2]);
+									if ($end >= $size) {
+										$end = $size - 1;
+									}
+									$toEnd = ($end == ($size - 1));
+								}
+							}
+							$psize = $end - $start + 1;
+
+							header('HTTP/1.1 206 Partial Content');
+							header('Content-Length: ' . $psize);
+							header('Content-Range: bytes ' . $start . '-' . $end . '/' . $size);
+
+							if (isset($data['info']['xsendfile']) && strtolower($data['info']['xsendfile']) === 'x-sendfile') {
+								if (function_exists('header_remove')) {
+									header_remove($data['info']['xsendfile']);
+								} else {
+									header($data['info']['xsendfile'] . ':');
+								}
+								unset($data['info']['xsendfile']);
+								if ($this->reqMethod !== 'HEAD') {
+									$sendData = true;
+								}
+							}
+
+							$sendData && !elFinder::isSeekableUrl($fp) && fseek($fp, $start);
+						}
+					}
+				}
+				if ($sendData && is_null($psize)) {
+					elFinder::rewind($fp);
+				}
+			} else {
+				header('Accept-Ranges: none');
+				if (isset($data['info']) && !$data['info']['size']) {
+					if (function_exists('header_remove')) {
+						header_remove('Content-Length');
+					} else {
+						header('Content-Length:');
+					}
+				}
+			}
+
+			if ($sendData) {
+				if ($toEnd || elFinder::isSeekableUrl($fp)) {
+					if (version_compare(PHP_VERSION, '5.6', '<')) {
+						file_put_contents('php://output', $fp);
+					} else {
+						$this->fma_stream_passthru($fp);
+					}
+				} else {
+					$out = fopen('php://output', 'wb');
+					stream_copy_to_stream($fp, $out, $psize);
+					fclose($out);
+				}
+			}
+
+			if (!empty($data['volume'])) {
+				$data['volume']->close($fp, $data['info']['hash']);
+			} else {
+				fclose($fp);
+			}
+			exit();
+		}
+
+		self::outputJson($data);
+		exit(0);
+	}
+}