From bf262a9674c4ea0b43ab1c3345af93d7b6614f55 Mon Sep 17 00:00:00 2001
From: Fraenkiman <frank.pcn@gmail.com>
Date: Thu, 20 Jun 2024 23:22:05 +0200
Subject: [PATCH] FavIcon plugin fine-tuning

In some cases, especially with shared hosts, there is already a favicon.ico file in the HTTP root directory.
However, a development document at Googledocs describes that there should only be one icon per HTTP host/website.

My observation over several weeks in the Google Searchconsole is that the crawler is irritated if either several favicon.ico files are present in the website (http host) or the crawler is fobbed off with 404.

The effect is that no favicon file is displayed in the search results during indexing.

A temporary redirection (http_response_code 307) when the plugin is active seems more elegant -> implemented here.
When the plugin is active, the user agent and the crawler also receive a message (?v=2) that the HTTP host is equipped with new favicons.

In addition, some FlatPress icons have been given a final polish. This is particularly noticeable on mobile devices and search engines, but also when creating a FlatPress link in social media.

You can use https://realfavicongenerator.net/favicon_checker for testing.
---
 fp-plugins/favicon/doc_favicon.txt            |   4 +-
 .../imgs/apple-touch-icon-precomposed.png     | Bin 0 -> 5447 bytes
 ...-icon-180x180.png => apple-touch-icon.png} | Bin
 fp-plugins/favicon/imgs/browserconfig.xml.php |  12 ++-
 fp-plugins/favicon/imgs/favicon-16x16.ico     | Bin 1150 -> 0 bytes
 fp-plugins/favicon/imgs/favicon-32x32.ico     | Bin 4286 -> 0 bytes
 fp-plugins/favicon/imgs/favicon-48x48.ico     | Bin 9662 -> 0 bytes
 .../favicon/imgs/site.webmanifest.json.php    |   8 +-
 fp-plugins/favicon/plugin.favicon.php         |  95 +++++++++++-------
 9 files changed, 74 insertions(+), 45 deletions(-)
 create mode 100644 fp-plugins/favicon/imgs/apple-touch-icon-precomposed.png
 rename fp-plugins/favicon/imgs/{apple-touch-icon-180x180.png => apple-touch-icon.png} (100%)
 delete mode 100644 fp-plugins/favicon/imgs/favicon-16x16.ico
 delete mode 100644 fp-plugins/favicon/imgs/favicon-32x32.ico
 delete mode 100644 fp-plugins/favicon/imgs/favicon-48x48.ico

diff --git a/fp-plugins/favicon/doc_favicon.txt b/fp-plugins/favicon/doc_favicon.txt
index 7d28e936..5bcb1aa5 100644
--- a/fp-plugins/favicon/doc_favicon.txt
+++ b/fp-plugins/favicon/doc_favicon.txt
@@ -9,7 +9,7 @@ If you want to use your own favicon, please make sure that the favicon is a mult
 The favicon.ico file should be a multi-layered icon with the sizes 16x16, 32x32 and 48x48.
 
 To display the favicon correctly on mobile Android devices, the path in the site.webmanifest.json.php file must refer to the favicon.
-The same applies to Windows 10 devices or higher.  The path to the matching icons is specified in the browserconfig.xml.php file.
+The same applies to Windows 10 devices or higher. The path to the matching icons is specified in the browserconfig.xml.php file.
 
 Google Search, for example, only supports one favicon per website, whereby a website is defined by the host name.
-If you activate the FavIcon plugin, a request for the favicon in the main directory will be answered with 404.
+If you activate the FavIcon plugin, a request for the favicon in the main directory will be answered with 307, temporary redirect.
diff --git a/fp-plugins/favicon/imgs/apple-touch-icon-precomposed.png b/fp-plugins/favicon/imgs/apple-touch-icon-precomposed.png
new file mode 100644
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diff --git a/fp-plugins/favicon/imgs/apple-touch-icon-180x180.png b/fp-plugins/favicon/imgs/apple-touch-icon.png
similarity index 100%
rename from fp-plugins/favicon/imgs/apple-touch-icon-180x180.png
rename to fp-plugins/favicon/imgs/apple-touch-icon.png
diff --git a/fp-plugins/favicon/imgs/browserconfig.xml.php b/fp-plugins/favicon/imgs/browserconfig.xml.php
index 5526d5f2..e99eb7ab 100644
--- a/fp-plugins/favicon/imgs/browserconfig.xml.php
+++ b/fp-plugins/favicon/imgs/browserconfig.xml.php
@@ -3,15 +3,19 @@
 
 require_once('../../../defaults.php');
 $blogBaseUrl = BLOG_BASEURL;
+
+// Indicates the version of the symbol. Increase it by one when you change the image ($v = '?v=3', $v = '?v=4', etc.).
+// The browser will then immediately display the latest version.
+$v = '?v=2';
 ?>
 <?xml version="1.0" encoding="utf-8"?>
 <browserconfig>
 	<msapplication>
 		<tile>
-			<square70x70logo src="<?php echo $blogBaseUrl;?>mstile-70x70.png"/>
-			<square150x150logo src="<?php echo $blogBaseUrl;?>mstile-150x150.png"/>
-			<square310x310logo src="<?php echo $blogBaseUrl;?>mstile-310x310.png"/>
-			<wide310x150logo src="<?php echo $blogBaseUrl;?>mstile-310x150.png"/>
+			<square70x70logo src="<?php echo $blogBaseUrl;?>mstile-70x70.png<?php echo $v;?>"/>
+			<square150x150logo src="<?php echo $blogBaseUrl;?>mstile-150x150.png<?php echo $v;?>"/>
+			<square310x310logo src="<?php echo $blogBaseUrl;?>mstile-310x310.png<?php echo $v;?>"/>
+			<wide310x150logo src="<?php echo $blogBaseUrl;?>mstile-310x150.png<?php echo $v;?>"/>
 			<TileColor>#b77b7b</TileColor>
 		</tile>
 	</msapplication>
diff --git a/fp-plugins/favicon/imgs/favicon-16x16.ico b/fp-plugins/favicon/imgs/favicon-16x16.ico
deleted file mode 100644
index 44ad541ccb36cb39d820ff4d53f4f8019a4e10ac..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/fp-plugins/favicon/imgs/favicon-32x32.ico b/fp-plugins/favicon/imgs/favicon-32x32.ico
deleted file mode 100644
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diff --git a/fp-plugins/favicon/imgs/site.webmanifest.json.php b/fp-plugins/favicon/imgs/site.webmanifest.json.php
index ff660559..160b925b 100644
--- a/fp-plugins/favicon/imgs/site.webmanifest.json.php
+++ b/fp-plugins/favicon/imgs/site.webmanifest.json.php
@@ -3,16 +3,20 @@
 
 require_once('../../../defaults.php');
 $blogBaseUrl = BLOG_BASEURL;
+
+// Indicates the version of the symbol. Increase it by one when you change the image ($v = '?v=3', $v = '?v=4', etc.).
+// The browser will then immediately display the latest version.
+$v = '?v=2';
 ?>
 {
 	"icons": [
 		{
-			"src": "<?php echo $blogBaseUrl;?>android-chrome-192x192.png",
+			"src": "<?php echo $blogBaseUrl;?>android-chrome-192x192.png<?php echo $v;?>",
 			"sizes": "192x192",
 			"type": "image/png"
 		},
 		{
-			"src": "<?php echo $blogBaseUrl;?>android-chrome-256x256.png",
+			"src": "<?php echo $blogBaseUrl;?>android-chrome-256x256.png<?php echo $v;?>",
 			"sizes": "256x256",
 			"type": "image/png"
 		}
diff --git a/fp-plugins/favicon/plugin.favicon.php b/fp-plugins/favicon/plugin.favicon.php
index fe7dabae..7f184b05 100755
--- a/fp-plugins/favicon/plugin.favicon.php
+++ b/fp-plugins/favicon/plugin.favicon.php
@@ -8,49 +8,70 @@
  * Description: Adds favicons for search engines, mobile devices or browsers to FlatPress. Part of the standard distribution. <a href="./fp-plugins/favicon/doc_favicon.txt" title="More information" target="_blank">[More information]</a>
  */
 
-// Google Search, for example, only supports one favicon per website, whereby a website is defined by the host name.
-// If an icon in the main directory, do not load!!!
-$httpHost = $_SERVER ['HTTP_HOST'];
-$requestUri = $_SERVER ['REQUEST_URI'];
-if (strpos($httpHost, 'favicon') || strpos($requestUri, 'favicon')) {
-	http_response_code(404);
-}
+function plugin_favicon_head() {
 
-if (strpos($httpHost, 'apple-touch-icon') || strpos($requestUri, 'apple-touch-icon')) {
-	http_response_code(404);
-}
+	// Google Search, for example, only supports one favicon per website, whereby a website is defined by the host name.
+	// If an icon is in the main directory, do not load it, but redirect it temporarily!!!
+	redir_favicon();
+
+	// Indicates the version of the symbol. Increase it by one when you change the image ($v = '?v=3', $v = '?v=4', etc.).
+	// The browser will then immediately display the latest version.
+	$v = '?v=2';
 
-function plugin_favicon_head() {
-	// FlatPress icon set
 	echo '
-		<!-- BOF FavIcon -->
-		' . // Smartphone iOS Safari
-		'<link rel="apple-touch-icon" sizes="180x180" href="' . plugin_geturl('favicon') . 'imgs/apple-touch-icon-180x180.png">' . //
-		'<link rel="apple-touch-icon" sizes="152x152" href="' . plugin_geturl('favicon') . 'imgs/apple-touch-icon-152x152.png">' . //
-		'<link rel="apple-touch-icon" sizes="120x120" href="' . plugin_geturl('favicon') . 'imgs/apple-touch-icon-120x120.png">' . //
-		'<link rel="apple-touch-icon" sizes="76x76" href="' . plugin_geturl('favicon') . 'imgs/apple-touch-icon-76x76.png">' . //
-		'<link rel="apple-touch-icon" sizes="60x60" href="' . plugin_geturl('favicon') . 'imgs/apple-touch-icon-60x60.png">' . //
-			// Smartphone Android Chrome
-		'<link rel="icon" type="image/png" sizes="256x256" href="' . plugin_geturl('favicon') . 'imgs/android-chrome-256x256.png">' . // For Android home screen
-		'<link rel="icon" type="image/png" sizes="192x192" href="' . plugin_geturl('favicon') . 'imgs/android-chrome-192x192.png">' . //
-		'<link rel="icon" type="image/png" sizes="32x32" href="' . plugin_geturl('favicon') . 'imgs/favicon-32x32.png">' . //
-		'<link rel="icon" type="image/png" sizes="16x16" href="' . plugin_geturl('favicon') . 'imgs/favicon-16x16.png">' . //
-		'<link rel="manifest" href="' . plugin_geturl('favicon') . 'imgs/site.webmanifest.json.php">' . // This file must be located in the imgs directory!
-			// Mac OS Safari
-		'<link rel="mask-icon" href="' . plugin_geturl('favicon') . 'imgs/safari-pinned-tab.svg" color="#aa4142">' . // Mask icon for Safari pinned tabs
-			// Classic/, desktop browsers
-		'<link rel="icon" sizes="16x16 32x32 48x48" href="' . plugin_geturl('favicon') . 'imgs/favicon.ico">' . // Multilayer icon
-		'<link rel="icon" sizes="48x48" href="' . plugin_geturl('favicon') . 'imgs/favicon-48x48.ico">' . // Highest resolution icon
-		'<link rel="icon" sizes="32x32" href="' . plugin_geturl('favicon') . 'imgs/favicon-32x32.ico">' . //
-		'<link rel="icon" sizes="16x16" href="' . plugin_geturl('favicon') . 'imgs/favicon-16x16.ico">' . //
-			// Windows 10 or higher
+		<!-- BOF FavIcon -->' . //
+
+		// Smartphone iOS Safari
+		'<link rel="apple-touch-icon" sizes="180x180" href="' . plugin_geturl('favicon') . 'imgs/apple-touch-icon.png' . $v . '">' . //
+		'<link rel="apple-touch-icon" sizes="152x152" href="' . plugin_geturl('favicon') . 'imgs/apple-touch-icon-152x152.png' . $v . '">' . //
+		'<link rel="apple-touch-icon" sizes="120x120" href="' . plugin_geturl('favicon') . 'imgs/apple-touch-icon-120x120.png' . $v . '">' . //
+		'<link rel="apple-touch-icon" sizes="76x76" href="' . plugin_geturl('favicon') . 'imgs/apple-touch-icon-76x76.png' . $v . '">' . //
+		'<link rel="apple-touch-icon" sizes="60x60" href="' . plugin_geturl('favicon') . 'imgs/apple-touch-icon-60x60.png' . $v . '">' . //
+		'<link rel="apple-touch-icon-precomposed" sizes="180x180" href="' . plugin_geturl('favicon') . 'imgs/apple-touch-icon-precomposed.png' . $v . '">' . //
+
+		// Smartphone Android Chrome
+		'<link rel="icon" type="image/png" sizes="256x256" href="' . plugin_geturl('favicon') . 'imgs/android-chrome-256x256.png' . $v . '">' . // For Android home screen
+		'<link rel="icon" type="image/png" sizes="192x192" href="' . plugin_geturl('favicon') . 'imgs/android-chrome-192x192.png' . $v . '">' . //
+		'<link rel="icon" type="image/png" sizes="32x32" href="' . plugin_geturl('favicon') . 'imgs/favicon-32x32.png' . $v . '">' . //
+		'<link rel="icon" type="image/png" sizes="16x16" href="' . plugin_geturl('favicon') . 'imgs/favicon-16x16.png' . $v . '">' . //
+		'<link rel="manifest" href="' . plugin_geturl('favicon') . 'imgs/site.webmanifest.json.php' . $v . '">' . // This file must be located in the imgs directory!
+
+		// Mac OS Safari
+		'<link rel="mask-icon" href="' . plugin_geturl('favicon') . 'imgs/safari-pinned-tab.svg' . $v . '" color="#aa4142">' . // Mask icon for Safari pinned tabs
+
+		// Classic/, desktop browsers
+		'<link rel="icon" sizes="16x16 32x32 48x48" href="' . plugin_geturl('favicon') . 'favicon.ico' . $v . '">' . // FlatPress multilayer icon
+
+		// Windows 10 or higher
 		'<meta name="msapplication-TileColor" content="#b77b7b">' . //
-		'<meta name="msapplication-config" content="' . plugin_geturl('favicon') . 'imgs/browserconfig.xml.php">' . // This file must be located in the imgs directory!
-		'<meta name="msapplication-TileImage" content="' . plugin_geturl('favicon') . 'imgs/mstile-144x144.png">' . //
-		'<meta name="theme-color" content="#b77b7b">
-		<!-- EOF FavIcon -->
+		'<meta name="msapplication-config" content="' . plugin_geturl('favicon') . 'imgs/browserconfig.xml.php' . $v . '">' . // This file must be located in the imgs directory!
+		'<meta name="msapplication-TileImage" content="' . plugin_geturl('favicon') . 'imgs/mstile-144x144.png' . $v . '">' . //
+
+		'<meta name="theme-color" content="#b77b7b">' . // Specify a color for the browser toolbar and the status bar on mobile devices
+		'<!-- EOF FavIcon -->
 		';
 }
 
+function redir_favicon() {
+
+	$requestUri = $_SERVER ['REQUEST_URI'];
+	$favicons = array (
+		'favicon.ico',
+		'apple-touch-icon.png',
+		'apple-touch-icon-precomposed.png'
+	);
+
+	foreach($favicons as $favicon) {
+		if (strpos($requestUri, $favicon) !== false) {
+			http_response_code(307); // Temporary Redirect
+			header('Location: ' . plugin_geturl('favicon') . 'imgs/' . $favicon);
+			return true;
+		}
+	}
+
+	return false;
+}
+
+
 add_action('wp_head', 'plugin_favicon_head');
 ?>