Automatically add font license info for Google fonts

admin/class-manage-fonts.php

@@ -92,6 +92,8 @@ function delete_font_asset( $font_face ) {
 		}
 
 		if ( file_exists( $font_asset_path ) ) {
+			// Remove font license from readme.txt
+			$this->manage_font_license( $font_face['fontFamily'], 'remove' );
 			return unlink( $font_asset_path );
 		}
 
@@ -178,6 +180,10 @@ function save_local_fonts_to_theme() {
 				$new_font_faces = array( $uploaded_font_face );
 
 				$this->add_or_update_theme_font_faces( $_POST['font-name'], $font_slug, $new_font_faces );
+
+				// Add font license to readme.txt
+				$this->manage_font_license( $_POST['font-name'], $file_name );
+
 				return add_action( 'admin_notices', array( 'Font_Form_Messages', 'admin_notice_embed_font_success' ) );
 			}
 			return add_action( 'admin_notices', array( 'Font_Form_Messages', 'admin_notice_embed_font_file_error' ) );
@@ -229,8 +235,11 @@ function save_google_fonts_to_theme() {
 						);
 					}
 				}
+
 				$this->add_or_update_theme_font_faces( $google_font_name, $font_slug, $new_font_faces );
 
+				// Add font license to readme.txt
+				$this->manage_font_license( $font_family['family'], $file_name );
 			}
 
 			add_action( 'admin_notices', array( 'Font_Form_Messages', 'admin_notice_embed_font_success' ) );
@@ -296,7 +305,82 @@ function ( $font_family ) use ( $font_slug ) {
 			get_stylesheet_directory() . '/theme.json',
 			$theme_json_string
 		);
+	}
+
+	function manage_font_license( $font_name, $file_name ) {
+		if ( ! $font_name ) {
+			return;
+		}
+
+		// Get theme readme.txt
+		$readme_file          = get_stylesheet_directory() . '/readme.txt';
+		$readme_file_contents = file_get_contents( $readme_file );
+
+		if ( ! $readme_file ) {
+			return;
+		}
+
+		// Format font name for font source link
+		$google_formatted_font_name = str_replace( ' ', '+', $font_name );
+
+		// If file_name exists, then add font license to readme.txt
+		if ( 'remove' !== $file_name && is_string( $file_name ) ) {
+			// Check that the font is not already credited in readme.txt
+			if ( false === stripos( $readme_file_contents, $font_name ) ) {
+				// Require php-font-lib
+				require_once( __DIR__ . '/../includes/FontLib/Autoloader.php' );
+
+				// Build font source URL
+				$font_source = 'https://www.google.com/fonts/specimen/' . $google_formatted_font_name;
 
+				// Get license info from font file
+				$font = \FontLib\Font::load( get_stylesheet_directory() . '/assets/fonts/' . $file_name );
+				$font->parse();
+				$license_info = $font->getNameTableString( 13 ) ? $font->getNameTableString( 13 ) : '';
+
+				if ( stripos( $font->getNameTableString( 13 ), 'SIL Open Font License' ) ) {
+					// If license is SIL Open Font License, use custom format
+					$license_info = 'Licensed under the SIL Open Font License, Version 1.1';
+				}
+
+				$license_url = $font->getNameTableString( 14 ) ? "({$font->getNameTableString(14)})" : '';
+
+				// Build the font credits string
+				$font_credits = "
+{$font_name} Font
+{$license_info} {$license_url}
+Source: {$font_source}
+";
+
+				// Add font credits to the end of readme.txt
+				file_put_contents(
+					$readme_file,
+					$font_credits,
+					FILE_APPEND
+				);
+			}
+		}
+
+		// If file_name is set to 'remove', then remove font license from readme.txt
+		if ( 'remove' === $file_name ) {
+			// Check if font credits are in readme.txt
+			if ( false !== stripos( $readme_file_contents, $font_name ) ) {
+				// Calculate the start and end positions of the font credits
+				$font_name_strlength        = strlen( $font_name . ' Font' ) + 1;
+				$google_font_name_strlength = strlen( '/' . $google_formatted_font_name ) + 1;
+				$font_start                 = stripos( $readme_file_contents, $font_name . ' Font' ) + $font_name_strlength;
+				$font_end                   = stripos( $readme_file_contents, '/' . $google_formatted_font_name, $font_start );
+
+				// Check if the start and end positions are valid
+				if ( false === $font_start || false === $font_end ) {
+					return;
+				}
+
+				// Remove the font credits from readme.txt
+				$removed_font_credits = substr_replace( $readme_file_contents, '', $font_start - $font_name_strlength, $font_end + $google_font_name_strlength - $font_start + $font_name_strlength );
+				file_put_contents( $readme_file, $removed_font_credits );
+			}
+		}
 	}
 }
 

composer.json

@@ -32,12 +32,16 @@
 		"sirbrillig/phpcs-variable-analysis": "^2.8"
 	},
 	"require": {
-		"composer/installers": "~1.0"
+		"composer/installers": "~1.0",
+		"phenx/php-font-lib": "^0.5.4"
 	},
 	"scripts": {
 		"format": "phpcbf --standard=phpcs.xml.dist --report-summary --report-source",
 		"lint": "phpcs --standard=phpcs.xml.dist",
 		"test": "phpunit",
-		"test:watch": "phpunit-watcher watch < /dev/tty"
+		"test:watch": "phpunit-watcher watch < /dev/tty",
+		"post-autoload-dump": [
+			"cp -r vendor/phenx/php-font-lib/src/FontLib includes"
+		]
 	}
-}
+}