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<?php
/**
* The Attogram Router for PHP 7 - small, flexible, and surprisingly powerful
*
* @see https://github.com/attogram/router
* @see https://getitdaily.com/attogram-router/
*
* @license MIT
*/
declare(strict_types = 1);
namespace Attogram\Router;
use function array_pop;
use function array_shift;
use function count;
use function explode;
use function header;
use function in_array;
use function preg_match;
use function preg_replace;
use function rtrim;
use function strtr;
/**
* Class Router
* @package Attogram\Router
*/
class Router
{
const VERSION = '4.1.1-pre.1';
private $control = null;
private $forceSlash = false;
private $routesExact = [];
private $routesVariable = [];
private $uri = [];
private $uriBase = '';
private $uriCount = 0;
private $uriRelative = '';
private $vars = [];
/**
* Router constructor.
*/
public function __construct()
{
// Get the Base of the URI, without 'index.php'
$this->uriBase = strtr($this->getServer('SCRIPT_NAME'), ['index.php' => '']);
// make Relative URI - remove query string from the request (everything after ?)
$this->uriRelative = preg_replace('/\?.*/', '', $this->getServer('REQUEST_URI'));
// make Relative URI - remove the Base URI
$this->uriRelative = strtr($this->uriRelative, [$this->uriBase => '/']);
// remove trailing slash from Base URI
$this->uriBase = rtrim($this->uriBase, '/');
// make array from Relative URI
$this->uri = $this->getUriArray($this->uriRelative);
// directory depth of current request
$this->uriCount = count($this->uri);
// If needed, Bypass directive auto_globals_jit
if (!isset($GLOBALS['_SERVER'])) {
/** @noinspection PhpExpressionResultUnusedInspection */
$_SERVER; // force compiler to populate _SERVER into GLOBALS
}
}
/**
* Allow a route
*
* $router->allow($route, $control);
*
* route = a string with the URI list, forward-slash delimited
*
* Exact routing:
* Home: '/'
* Page: '/foo/bar'
* - preceding and trailing slashes are optional, except for top level '/'
*
* Variable routing:
* - use a question mark to denote a URI segment as a variable
* - variables are retrieved via: $router->getVar(int $index)
* - Examples:
* '/id/?' - retrieve with getVar(0)
* '/book/?/chapter/?' - retrieve with getVar(0) and getVar(1)
* '/foo/?/?/?' - retrieve with getVar(0), getVar(1) and getVar(2)
*
* control = anything you want, a string, a closure, an array, an object, an int, a float, whatever!
*
* @param string $route
* @param mixed $control
*/
public function allow(string $route, $control)
{
// make an array of the route
$routeUri = $this->getUriArray($route);
// Is this route not the same size as the current URI?
if ($this->uriCount !== count($routeUri)) {
return; // Do not add route
}
// Single Question Mark denotes a variable routing
if (in_array('?', $routeUri)) {
$this->routesVariable[$route] = ['c' => $control, 'u' => $routeUri]; // add variable route
return; // Variable route found
}
$this->routesExact[$route] = ['c' => $control, 'u' => $routeUri]; // add exact route
}
/**
* Get the matching control for the current request
* - optionally, force a trailing slash on current request
*
* @return mixed|null
*/
public function match()
{
// if forceSlash is ON, and there is no trailing slash on current request
if ($this->forceSlash && !$this->hasTrailingSlash($this->uriRelative)) {
$this->forceSlash();
}
// Find control for current request, first with exact matching, then with variable matching
if ($this->matchExact() || $this->matchVariable()) {
return $this->control; // Match found
}
return null; // No match found
}
/**
* @return string
*/
public function getHome(): string
{
return $this->uriBase . ($this->hasTrailingSlash($this->uriBase) ? '' : '/');
}
/**
* @return string
*/
public function getHomeFull(): string
{
return$this->getHostFull() . $this->getHome();
}
/**
* @return string
*/
public function getCurrent(): string
{
return $this->uriBase . $this->uriRelative;
}
/**
* @return string
*/
public function getCurrentFull(): string
{
return $this->getHostFull() . $this->getCurrent();
}
/**
* @return string
*/
public function getHost(): string
{
$serverName = $this->getServer('SERVER_NAME');
$serverPort = $this->getServer('SERVER_PORT');
return $serverName . (!in_array((int) $serverPort, [80, 443]) ? ':' . $serverPort : '');
}
/**
* @return string
*/
public function getHostFull(): string
{
return $this->getProtocol() . '://' . $this->getHost();
}
/**
* @return string - 'http' or 'https'
*/
public function getProtocol(): string
{
$https = $this->getServer('HTTPS');
$serverPort = $this->getServer('SERVER_PORT');
return (
(!empty($https) && ($https !== 'off'))
|| ($serverPort == 443)
)
? 'https'
: 'http';
}
/**
* Get a URI variable, based on index
*
* @param int $index
* @return string|null
*/
public function getVar(int $index = 0)
{
return isset($this->vars[$index]) ? $this->vars[$index] : null;
}
/**
* Force a trailing slash on all requests? Occurs in match()
*
* @param bool $forceSlash
*/
public function setForceSlash(bool $forceSlash)
{
$this->forceSlash = $forceSlash;
}
/**
* get the value of a global _SERVER variable, or the whole _SERVER array
*
* @param string $name
* @return array|string
*/
public function getServer(string $name = '')
{
return $this->getGlobal('_SERVER', $name);
}
/**
* Redirect to a new URL, and exit
* - optionally set HTTP Response Code (301 = Moved Permanently, 302 = Found)
*
* @param string $url
* @param int $httpResponseCode
* @param bool $exitAfter - default: true
*/
public function redirect(string $url, int $httpResponseCode = 301, bool $exitAfter = true)
{
header('Location: ' . $url, true, $httpResponseCode);
if ($exitAfter) {
exit; // After a redirect, we must exit to halt any further script execution
}
}
/**
* get a value from the global _GET array, or the whole _GET array
*
* @param string $name
* @return array|string
*/
public function getGet(string $name = '')
{
return $this->getGlobal('_GET', $name);
}
/**
* get a value from a global array, or the whole global array
*
* @param string $global
* @param string $name
* @return array|null|string
*/
private function getGlobal(string $global, string $name)
{
if (!isset($GLOBALS[$global]) // Global does not exist
|| !is_array($GLOBALS[$global]) // Global is not an array
|| ($name && !isset($GLOBALS[$global][$name])) // Global variable does not exist
) {
return null;
}
if (!$name) {
return $GLOBALS[$global]; // return entire Global array
}
return $GLOBALS[$global][$name]; // return requested Global variable
}
/**
* @param string $uri
* @return bool
*/
private function hasTrailingSlash(string $uri): bool
{
return (1 === preg_match('#/$#', $uri)) ? true : false;
}
/**
* Force a trailing slash on the current request
*/
private function forceSlash()
{
// add a trailing slash to the current URL
$url = $this->getCurrentFull() . '/';
// if there is a query string in the current request
$queryString = $this->getServer('QUERY_STRING');
if (!empty($queryString)) {
// add the query string to the redirect URL
$url .= '?' . $queryString;
}
$this->redirect($url);
}
/**
* Match URI to an exact route
* @return bool
*/
private function matchExact(): bool
{
foreach ($this->routesExact as $route) {
if ($this->uri === $route['u']) { // compare the current URI array to this route URI array
$this->control = $route['c']; // set control or this exact match
return true; // exact match found
}
}
return false; // exact match not found
}
/**
* Match URI to a variable route
* @return bool
*/
private function matchVariable(): bool
{
foreach ($this->routesVariable as $route) {
$this->matchVariableVars($route['u']); // find variables
if (empty($this->vars)) {
continue; // no variable match yet
}
$this->control = $route['c']; // set control for this variable match
return true; // variable match found
}
return false; // variable match not found
}
/**
* Populate an ordered array of URI segment variables
*
* @param array $routeUri
*/
private function matchVariableVars(array $routeUri)
{
$this->vars = [];
foreach ($routeUri as $index => $route) {
if (!in_array($route, ['?', $this->uri[$index]])) {
$this->vars = [];
return; // match failed - no exact match, no variable match
}
if ($route === '?') { // found a variable
$this->vars[] = $this->uri[$index];
}
}
}
/**
* Build an array from a URI string
*
* @param string $uri
* @return array
*/
private function getUriArray(string $uri): array
{
$array = explode('/', $uri);
if ($array[0] === '') { // If first segment is empty
array_shift($array); // trim off first segment
}
if (count($array) <= 1) { // If array has 1 or less segments
return $array;
}
if ($array[count($array)-1] === '') { // If last segment is empty
array_pop($array); // trim off last segment
}
return $array;
}
}
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