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File/Folder	Size	Actions
ArrayUtil.php	2.1 KB
BlocksUtil.php	2.28 KB
COTMigrationUtil.php	6.04 KB
DatabaseUtil.php	16.1 KB
FilesystemUtil.php	5.18 KB
HtmlSanitizer.php	3.1 KB
LegacyRestApiStub.php	6.65 KB
PluginInstaller.php	14.01 KB
ProductUtil.php	1.16 KB
Types.php	1.97 KB
URL.php	13.1 KB
URLException.php	191 B
Users.php	9.33 KB
WebhookUtil.php	5.37 KB
error_log	16.09 KB

Edit: URL.php

<?php

namespace Automattic\WooCommerce\Internal\Utilities;

/**
 * Provides an easy method of assessing URLs, including filepaths (which will be silently
 * converted to a file:// URL if provided).
 */
class URL {
	/**
	 * Components of the URL being assessed.
	 *
	 * The keys match those potentially returned by the parse_url() function, except
	 * that they are always defined and 'drive' (Windows drive letter) has been added.
	 *
	 * @var string|null[]
	 */
	private $components = array(
		'drive'    => null,
		'fragment' => null,
		'host'     => null,
		'pass'     => null,
		'path'     => null,
		'port'     => null,
		'query'    => null,
		'scheme'   => null,
		'user'     => null,
	);

/**
	 * If the URL (or filepath) is absolute.
	 *
	 * @var bool
	 */
	private $is_absolute;

/**
	 * If the URL (or filepath) represents a directory other than the root directory.
	 *
	 * This is useful at different points in the process, when deciding whether to re-apply
	 * a trailing slash at the end of processing or when we need to calculate how many
	 * directory traversals are needed to form a (grand-)parent URL.
	 *
	 * @var bool
	 */
	private $is_non_root_directory;

/**
	 * The components of the URL's path.
	 *
	 * For instance, in the case of "file:///srv/www/wp.site" (noting that a file URL has
	 * no host component) this would contain:
	 *
	 *     [ "srv", "www", "wp.site" ]
	 *
	 * In the case of a non-file URL such as "https://example.com/foo/bar/baz" (noting the
	 * host is not part of the path) it would contain:
	 *
	 *    [ "foo", "bar", "baz" ]
	 *
	 * @var array
	 */
	private $path_parts = array();

/**
	 * The URL.
	 *
	 * @var string
	 */
	private $url;

/**
	 * Creates and processes the provided URL (or filepath).
	 *
	 * @throws URLException If the URL (or filepath) is seriously malformed.
	 *
	 * @param string $url The URL (or filepath).
	 */
	public function __construct( string $url ) {
		$this->url = $url;
		$this->preprocess();
		$this->process_path();
	}

/**
	 * Makes all slashes forward slashes, converts filepaths to file:// URLs, and
	 * other processing to help with comprehension of filepaths.
	 *
	 * @throws URLException If the URL is seriously malformed.
	 */
	private function preprocess() {
		// For consistency, all slashes should be forward slashes.
		$this->url = str_replace( '\\', '/', $this->url );

// Windows: capture the drive letter if provided.
		if ( preg_match( '#^(file://)?([a-z]):/(?!/).*#i', $this->url, $matches ) ) {
			$this->components['drive'] = $matches[2];
		}

/*
		 * If there is no scheme, assume and prepend "file://". An exception is made for cases where the URL simply
		 * starts with exactly two forward slashes, which indicates 'any scheme' (most commonly, that is used when
		 * there is freedom to switch between 'http' and 'https').
		 */
		if ( ! preg_match( '#^[a-z]+://#i', $this->url ) && ! preg_match( '#^//(?!/)#', $this->url ) ) {
			$this->url = 'file://' . $this->url;
		}

$parsed_components = wp_parse_url( $this->url );

// If we received a really badly formed URL, let's go no further.
		if ( false === $parsed_components ) {
			throw new URLException(
				sprintf(
				/* translators: %s is the URL. */
					__( '%s is not a valid URL.', 'woocommerce' ),
					$this->url
				)
			);
		}

$this->components = array_merge( $this->components, $parsed_components );

// File URLs cannot have a host. However, the initial path segment *or* the Windows drive letter
		// (if present) may be incorrectly be interpreted as the host name.
		if ( 'file' === $this->components['scheme'] && ! empty( $this->components['host'] ) ) {
			// If we do not have a drive letter, then simply merge the host and the path together.
			if ( null === $this->components['drive'] ) {
				$this->components['path'] = $this->components['host'] . ( $this->components['path'] ?? '' );
			}

// Restore the host to null in this situation.
			$this->components['host'] = null;
		}
	}

/**
	 * Simplifies the path if possible, by resolving directory traversals to the extent possible
	 * without touching the filesystem.
	 */
	private function process_path() {
		$segments                    = explode( '/', $this->components['path'] );
		$this->is_absolute           = substr( $this->components['path'], 0, 1 ) === '/' || ! empty( $this->components['host'] );
		$this->is_non_root_directory = substr( $this->components['path'], -1, 1 ) === '/' && strlen( $this->components['path'] ) > 1;
		$resolve_traversals          = 'file' !== $this->components['scheme'] || $this->is_absolute;
		$retain_traversals           = false;

// Clean the path.
		foreach ( $segments as $part ) {
			// Drop empty segments.
			if ( strlen( $part ) === 0 || '.' === $part ) {
				continue;
			}

// Directory traversals created with percent-encoding syntax should also be detected.
			$is_traversal = str_ireplace( '%2e', '.', $part ) === '..';

// Resolve directory traversals (if allowed: see further comment relating to this).
			if ( $resolve_traversals && $is_traversal ) {
				if ( count( $this->path_parts ) > 0 && ! $retain_traversals ) {
					$this->path_parts = array_slice( $this->path_parts, 0, count( $this->path_parts ) - 1 );
					continue;
				} elseif ( $this->is_absolute ) {
					continue;
				}
			}

/*
			 * Consider allowing directory traversals to be resolved (ie, the process that converts 'foo/bar/../baz' to
			 * 'foo/baz').
			 *
			 * 1. For this decision point, we are only concerned with relative filepaths (in all other cases,
			 *    $resolve_traversals will already be true).
			 * 2. This is a 'one time' and unidirectional operation. We only wish to flip from false to true, and we
			 *    never wish to do this more than once.
			 * 3. We only flip the switch after we have examined all leading '..' traversal segments.
			 */
			if ( false === $resolve_traversals && '..' !== $part && 'file' === $this->components['scheme'] && ! $this->is_absolute ) {
				$resolve_traversals = true;
			}

/*
			 * Set a flag indicating that traversals should be retained. This is done to ensure we don't prematurely
			 * discard traversals at the start of the path.
			 */
			$retain_traversals = $resolve_traversals && '..' === $part;

// Retain this part of the path.
			$this->path_parts[] = $part;
		}

// Protect against empty relative paths.
		if ( count( $this->path_parts ) === 0 && ! $this->is_absolute ) {
			$this->path_parts = array( '.' );
			$this->is_non_root_directory = true;
		}

// Reform the path from the processed segments, appending a leading slash if it is absolute and restoring
		// the Windows drive letter if we have one.
		$this->components['path'] = ( $this->is_absolute ? '/' : '' ) . implode( '/', $this->path_parts ) . ( $this->is_non_root_directory ? '/' : '' );
	}

/**
	 * Returns the processed URL as a string.
	 *
	 * @return string
	 */
	public function __toString(): string {
		return $this->get_url();
	}

/**
	 * Returns all possible parent URLs for the current URL.
	 *
	 * @return string[]
	 */
	public function get_all_parent_urls(): array {
		$max_parent = count( $this->path_parts );
		$parents    = array();

/*
		 * If we are looking at a relative path that begins with at least one traversal (example: "../../foo")
		 * then we should only return one parent URL (otherwise, we'd potentially have to return an infinite
		 * number of parent URLs since we can't know how far the tree extends).
		 */
		if ( $max_parent > 0 && ! $this->is_absolute && '..' === $this->path_parts[0] ) {
			$max_parent = 1;
		}

for ( $level = 1; $level <= $max_parent; $level++ ) {
			$parents[] = $this->get_parent_url( $level );
		}

return $parents;
	}

/**
	 * Outputs the parent URL.
	 *
	 * For example, if $this->get_url() returns "https://example.com/foo/bar/baz" then
	 * this method will return "https://example.com/foo/bar/".
	 *
	 * When a grand-parent is needed, the optional $level parameter can be used. By default
	 * this is set to 1 (parent). 2 will yield the grand-parent, 3 will yield the great
	 * grand-parent, etc.
	 *
	 * If a level is specified that exceeds the number of path segments, this method will
	 * return false.
	 *
	 * @param int $level Used to indicate the level of parent.
	 *
	 * @return string|false
	 */
	public function get_parent_url( int $level = 1 ) {
		if ( $level < 1 ) {
			$level = 1;
		}

$parts_count               = count( $this->path_parts );
		$parent_path_parts_to_keep = $parts_count - $level;

/*
		 * With the exception of file URLs, we do not allow obtaining (grand-)parent directories that require
		 * us to describe them using directory traversals. For example, given "http://hostname/foo/bar/baz.png" we do
		 * not permit determining anything more than 2 levels up (we cannot go beyond "http://hostname/").
		 */
		if ( 'file' !== $this->components['scheme'] && $parent_path_parts_to_keep < 0 ) {
			return false;
		}

// In the specific case of an absolute filepath describing the root directory, there can be no parent.
		if ( 'file' === $this->components['scheme'] && $this->is_absolute && empty( $this->path_parts ) ) {
			return false;
		}

// Handle cases where the path starts with one or more 'dot segments'. Since the path has already been
		// processed, we can be confident that any such segments are at the start of the path.
		if ( $parts_count > 0 && ( '.' === $this->path_parts[0] || '..' === $this->path_parts[0] ) ) {
			// Determine the index of the last dot segment (ex: given the path '/../../foo' it would be 1).
			$single_dots   = array_keys( $this->path_parts, '.', true );
			$double_dots   = array_keys( $this->path_parts, '..', true );
			$max_dot_index = max( array_merge( $single_dots, $double_dots ) );

// Prepend the required number of traversals and discard unnecessary trailing segments.
			$last_traversal = $max_dot_index + ( $this->is_non_root_directory ? 1 : 0 );
			$parent_path    = str_repeat( '../', $level ) . join( '/', array_slice( $this->path_parts, 0, $last_traversal ) );
		} elseif ( $parent_path_parts_to_keep < 0 ) {
			// For relative filepaths only, we use traversals to describe the requested parent.
			$parent_path = untrailingslashit( str_repeat( '../', $parent_path_parts_to_keep * -1 ) );
		} else {
			// Otherwise, in a very simple case, we just remove existing parts.
			$parent_path = implode( '/', array_slice( $this->path_parts, 0, $parent_path_parts_to_keep ) );
		}

if ( $this->is_relative() && '' === $parent_path ) {
			$parent_path = '.';
		}

// Append a trailing slash, since a parent is always a directory. The only exception is the current working directory.
		$parent_path .= '/';

// For absolute paths, apply a leading slash (does not apply if we have a root path).
		if ( $this->is_absolute && 0 !== strpos( $parent_path, '/' ) ) {
			$parent_path = '/' . $parent_path;
		}

// Form the parent URL (ditching the query and fragment, if set).
		$parent_url = $this->get_url(
			array(
				'path'     => $parent_path,
				'query'    => null,
				'fragment' => null,
			)
		);

// We process the parent URL through a fresh instance of this class, for consistency.
		return ( new self( $parent_url ) )->get_url();
	}

/**
	 * Outputs the processed URL.
	 *
	 * Borrows from https://www.php.net/manual/en/function.parse-url.php#106731
	 *
	 * @param array $component_overrides If provided, these will override values set in $this->components.
	 *
	 * @return string
	 */
	public function get_url( array $component_overrides = array() ): string {
		$components = array_merge( $this->components, $component_overrides );

$scheme = null !== $components['scheme'] ? $components['scheme'] . '://' : '//';
		$host   = null !== $components['host'] ? $components['host'] : '';
		$port   = null !== $components['port'] ? ':' . $components['port'] : '';
		$path   = $this->get_path( $components['path'] );

// Special handling for hostless URLs (typically, filepaths) referencing the current working directory.
		if ( '' === $host && ( '' === $path || '.' === $path ) ) {
			$path = './';
		}

$user      = null !== $components['user'] ? $components['user'] : '';
		$pass      = null !== $components['pass'] ? ':' . $components['pass'] : '';
		$user_pass = ( ! empty( $user ) || ! empty( $pass ) ) ? $user . $pass . '@' : '';

$query    = null !== $components['query'] ? '?' . $components['query'] : '';
		$fragment = null !== $components['fragment'] ? '#' . $components['fragment'] : '';

return $scheme . $user_pass . $host . $port . $path . $query . $fragment;
	}

/**
	 * Outputs the path. Especially useful if it was a a regular filepath that was passed in originally.
	 *
	 * @param string|null $path_override If provided this will be used as the URL path. Does not impact drive letter.
	 *
	 * @return string
	 */
	public function get_path( ?string $path_override = null ): string {
		return ( $this->components['drive'] ? $this->components['drive'] . ':' : '' ) . ( $path_override ?? $this->components['path'] );
	}

/**
	 * Indicates if the URL or filepath was absolute.
	 *
	 * @return bool True if absolute, else false.
	 */
	public function is_absolute(): bool {
		return $this->is_absolute;
	}

/**
	 * Indicates if the URL or filepath was relative.
	 *
	 * @return bool True if relative, else false.
	 */
	public function is_relative(): bool {
		return ! $this->is_absolute;
	}
}