IncludingFileSniff: add property of custom keywords to not trigger sniff

WordPressVIPMinimum/Sniffs/Files/IncludingFileSniff.php

@@ -13,8 +13,7 @@
 /**
  * WordPressVIPMinimum_Sniffs_Files_IncludingFileSniff.
  *
- * Checks that __DIR__, dirname( __FILE__ ) or plugin_dir_path( __FILE__ )
- * is used when including or requiring files.
+ * Checks for custom variables, functions and constants, and external URLs used in file inclusion.
  *
  * @package VIPCS\WordPressVIPMinimum
  */
@@ -55,6 +54,17 @@ class IncludingFileSniff extends AbstractFunctionRestrictionsSniff {
 		'WP_PLUGIN_DIR',
 	];
 
+	/**
+	 * List of keywords allowed for use in custom constants.
+	 * Note: Customizing this property will overwrite current default values.
+	 *
+	 * @var array
+	 */
+	public $allowedKeywords = [
+		'PATH',
+		'DIR',
+	];
+
 	/**
 	 * Functions used for modify slashes.
 	 *
@@ -122,6 +132,11 @@ public function process_token( $stackPtr ) {
 				return;
 			}
 
+			if ( $this->has_custom_path( $this->tokens[ $nextToken ]['content'] ) === true ) {
+				// The construct is using a constant with an allowed keyword.
+				return;
+			}
+
 			if ( array_key_exists( $this->tokens[ $nextToken ]['content'], $this->restrictedConstants ) === true ) {
 				// The construct is using one of the restricted constants.
 				$message = '`%s` constant might not be defined or available. Use `%s()` instead.';
@@ -172,4 +187,21 @@ public function process_token( $stackPtr ) {
 		$message = 'Absolute include path must be used. Use `get_template_directory()`, `get_stylesheet_directory()` or `plugin_dir_path()`.';
 		$this->phpcsFile->addError( $message, $nextToken, 'NotAbsolutePath' );
 	}
+
+	/**
+	 * Check if a content string contains a keyword in custom paths.
+	 *
+	 * @param string $content  Content string.
+	 *
+	 * @return bool True if the string partially matches a keyword in $allowedCustomKeywords, false otherwise.
+	 */
+	private function has_custom_path( $content ) {
+		foreach ( $this->allowedKeywords as $keyword ) {
+			if ( strpos( $content, $keyword ) !== false ) {
+				return true;
+			}
+		}
+
+		return false;
+	}
 }

WordPressVIPMinimum/Tests/Files/IncludingFileUnitTest.inc

@@ -25,4 +25,13 @@ require_once "my_file.php"; // Not absolute path.
 require '../my_file.php'; // Not absolute path.
 require '../../my_file.php'; // Not absolute path.
 include( 'http://www.google.com/bad_file.php' ); // External URL.
-include_once("http://www.google.com/bad_file.php"); // External URL.
+include_once("http://www.google.com/bad_file.php"); // External URL.
+
+// Allowed keywords
+include 'https://path.com/bad_file.php'; // Error - external URL with keyword from $allowedKeywords.
+require   $path; // Warning - custom variable with keyword from $allowedKeywords.
+include_once   dir_function(); // Error - custom functionm with keyword from $allowedKeywords.
+require CUSTOM_CONSTANT_DIR . 'file.php'; // OK.
+require_once ( VIPCS_PATH ) . 'file.php'; // OK.
+include_once      
+  DIR_CUSTOM , 'file.php'; // OK.

WordPressVIPMinimum/Tests/Files/IncludingFileUnitTest.php

@@ -29,6 +29,7 @@ public function getErrorList() {
 			26 => 1,
 			27 => 1,
 			28 => 1,
+			31 => 1,
 		];
 	}
 
@@ -43,6 +44,8 @@ public function getWarningList() {
 			19 => 1,
 			20 => 1,
 			21 => 1,
+			32 => 1,
+			33 => 1,
 		];
 	}