From 86e6f6d9c9c0340d32fb9fbf93fdc938bef75bcf Mon Sep 17 00:00:00 2001
From: Jacek Kowalski <Jacek@jacekk.info>
Date: Sun, 20 Jun 2021 20:01:20 +0000
Subject: [PATCH] Update bus types: DN001, PA100-PA101, BR564-BR568, PR767-PR768, PR777

---
 lib/Fetch.php |   80 +++++++++++++++++++++++++++++++++-------
 1 files changed, 66 insertions(+), 14 deletions(-)

diff --git a/lib/Fetch.php b/lib/Fetch.php
index 78e5bfe..3b8d540 100644
--- a/lib/Fetch.php
+++ b/lib/Fetch.php
@@ -20,7 +20,7 @@
 		if(!isset($url['pass'])) {
 			$url['pass'] = 'anonymous@mpk.jacekk.net';
 		}
-		if($file == NULL) {
+		if($file === NULL) {
 			$file = basename($url['path']);
 		}
 		
@@ -37,34 +37,86 @@
 		
 		$updated = FALSE;
 		
-		if($localTime < $remoteTime || ($localTime == $remoteTime && $localSize != $remoteSize)) {
-			if(file_exists($file.'.tmp')) {
-				unlink($file.'.tmp');
-			}
-			$ftp->get($file.'.tmp', $url['path'], FTP_BINARY);
-			touch($file.'.tmp', $remoteTime);
-			if(!rename($file.'.tmp', $file)) {
-				throw new Exception('Temporary file rename failed');
-			}
-			$updated = TRUE;
+		if($localTime >= $remoteTime && $localSize == $remoteSize) {
+			return FALSE;
 		}
 		
-		return $updated;
+		if(file_exists($file.'.tmp')) {
+			unlink($file.'.tmp');
+		}
+		$ftp->get($file.'.tmp', $url['path'], FTP_BINARY);
+		touch($file.'.tmp', $remoteTime);
+		if(!rename($file.'.tmp', $file)) {
+			throw new Exception('Temporary file rename failed');
+		}
+		
+		return TRUE;
+	}
+	
+	static function parse_http_headers($headers) {
+		$hasHeader = FALSE;
+		foreach($headers as $header) {
+			if(substr($header, 0, 5) === 'HTTP/') {
+				$code = substr($header, 9, 3);
+				if($code === '304') {
+					return NULL;
+				} elseif(substr($code, 0, 1) == '2') {
+					$hasHeader = TRUE;
+				}
+			} elseif($hasHeader && strtolower(substr($header, 0, 15)) === 'last-modified: ') {
+				return strptime(substr($header, 15), 'D, d M Y H:i:s T');
+			}
+		}
+		return FALSE;
 	}
 	
 	static function generic($url, $file = NULL) {
-		if($file == NULL) {
+		if($file === NULL) {
 			$file = basename($url['url']);
 		}
-		$data = file_get_contents($url);
+		
+		$context = [];
+		if(is_file($file)) {
+			$file_date = filemtime($file);
+			$context['http'] = [
+				'header' => [
+					'If-Modified-Since: '.gmdate('D, d M Y H:i:s T', $file_date),
+				],
+			];
+		}
+		
+		$data = file_get_contents($url, FALSE, stream_context_create($context));
+		$remoteTime = FALSE;
+		if(isset($http_response_header) && is_array($http_response_header)) {
+			$remoteTime = self::parse_http_headers($http_response_header);
+			if($remoteTime === NULL) {
+				return FALSE;
+			}
+		}
+		
 		if($data === FALSE) {
 			throw new Exception('URL fetch failed');
 		}
 		if(file_put_contents($file.'.tmp', $data) === FALSE) {
 			throw new Exception('Temporary file creation failed');
 		}
+		if($remoteTime !== FALSE) {
+			touch($file.'.tmp', $remoteTime);
+		}
 		if(!rename($file.'.tmp', $file)) {
 			throw new Exception('Temporary file rename failed');
 		}
+		
+		return TRUE;
+	}
+	
+	static function auto($url, $file = NULL) {
+		if($file === NULL) {
+			$file = basename($url['url']);
+		}
+		if(substr($url, 0, 4) == 'ftp:') {
+			return self::ftp($url, $file);
+		}
+		return self::generic($url, $file);
 	}
 }

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