WithLocalURL.php
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	<?php

	namespace Keruald\OmniTools\HTTP\Requests;

	use RuntimeException;

	trait WithLocalURL {

	///
	/// Properties from configuration
	///

	private string $baseUrl = "";

	private ?string $siteUrl = null;

	///
	/// Properties
	///

	private function getSiteUrl () : string {
	return $this->siteUrl ?? Request::getServerURL();
	}

	public function withBaseUrl (string $url) : static {
	$this->baseUrl = $url;

	return $this;
	}

	public function withSiteUrl (string $url) : static {
	$this->siteUrl = $url;

	return $this;
	}

	///
	/// Methods to get or build URLs
	///

	/**
	* Gets the URL matching the specified resource.
	*
	* Example:
	* <code>
	* $ship = new Ship();
	* $ship->id = "S00001";
	*
	* $request = new Request();
	* $url = $request->buildUrl("ship", $ship->id);
	* echo $url; // This should print "/ship/S00001"
	* </code>
	*
	* @param string ...$parts The URL parts
	* @return string the URL matching the specified resource
	*/
	public function buildUrl (string ...$parts) : string {
	if (self::hasParts($parts)) {
	$baseUrl = $this->baseUrl;
	if (!str_ends_with($baseUrl, "/")) {
	$baseUrl .= "/";
	}

	return $baseUrl . implode("/", $parts);
	}

	if ($this->baseUrl == "" \|\| $this->baseUrl == $_SERVER["PHP_SELF"]) {
	return "/";
	}

	return $this->baseUrl;
	}

	private static function hasParts (array $parts) : bool {
	if (count($parts) == 0) {
	return false;
	}

	if (count($parts) == 1 && $parts[0] == "") {
	return false;
	}

	return true;
	}

	/**
	* Gets $_SERVER["PATH_INFO"] or computes the equivalent if not defined.
	*
	* This function allows the entry point controllers to get the current URL
	* consistently, for any redirection configuration.
	*
	* So with /foo/bar, /index.php/foo/bar, /zed/index.php/foo/bar or /zed/foo/bar
	* `Request::getCurrentUrl()` will return /foo/bar each time.
	*
	* @return string the relevant URL part
	*/
	public function getCurrentUrl () : string {
	// CASE 1. PATH_INFO is defined.
	// This is a straightforward case, we just return it, server configuration
	// is responsible for properly cut the URL.
	if (array_key_exists("PATH_INFO", $_SERVER)) {
	return $_SERVER["PATH_INFO"];
	}

	// Useful parts of the URL
	$siteUrl = $this->getSiteUrl();
	$serverUrl = $this->getServerURL();
	$currentUrl = $serverUrl . $_SERVER["REQUEST_URI"];

	$server_len = strlen($serverUrl);
	$len = $server_len + strlen($this->baseUrl); // Relevant URL part starts after the site URL

	// Allow configuration to add an extraneous trailing slash from base URL
	if (str_ends_with($this->baseUrl, "/")) {
	$len--;
	}

	// Throw an exception if the site URL is not the beginning of the URL
	// because in that case, we can't determine where to cut the URL.
	if (substr($currentUrl, 0, $server_len) != $siteUrl) {
	throw new RuntimeException(
	"Site URL mismatch: a value starting by $serverUrl is expected, but got $siteUrl."
	);
	}

	// CASE 2. REDIRECT_URL is defined.
	//
	// A popular legacy configuration is Apache + mod_rewrite
	// to redirect content clean URLs to an entry point script.
	//
	// In that case, we take the part after this entry point script.
	if (array_key_exists("REDIRECT_URL", $_SERVER)) {
	return substr($serverUrl . $_SERVER["REDIRECT_URL"], $len);
	}

	// CASE 3. Use REQUEST_URI but remove QUERY_STRING
	$url = substr($currentUrl, $len);
	if (array_key_exists("QUERY_STRING", $_SERVER) && $_SERVER["QUERY_STRING"] != "") {
	return substr($url, 0, strlen($url) - strlen($_SERVER["QUERY_STRING"]) - 1);
	}

	return $url;
	}

	/**
	* Gets an array of url fragments to be processed by controller
	* @see self::getCurrentUrl()
	*
	* This method is used by the controllers' entry points to know the URL and
	* call relevant subcontrollers.
	*
	* @return string[] an array of string, one for each URL fragment
	*/
	public function getCurrentUrlFragments () : array {
	$source = $this->getCurrentUrl();

	if ($source == $_SERVER["PHP_SELF"]) {
	return [];
	}

	return explode("/", substr($source, 1));
	}

	}

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