Add URL class

Author: MGatner

system/HTTP/URL.php

@@ -0,0 +1,177 @@
+<?php
+
+/**
+ * This file is part of the CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\HTTP;
+
+use CodeIgniter\HTTP\IncomingRequest;
+use Config\App;
+use Config\Services;
+use InvalidArgumentException;
+
+/**
+ * URI wrapper to work with complete project URLs.
+ * This class creates immutable instances.
+ */
+class URL
+{
+	/**
+	 * Underlying URI instance
+	 *
+	 * @var URI
+	 */
+	private $uri;
+
+	/**
+	 * Path relative to baseURL
+	 *
+	 * @var string
+	 */
+	protected $relativePath;
+
+	//--------------------------------------------------------------------
+
+	/**
+	 * Returns an instance representing the current URL.
+	 *
+	 * @return static
+	 */
+	final public static function base()
+	{
+		return new static('');
+	}
+
+	/**
+	 * Returns an instance representing the current URL.
+	 *
+	 * @param string $uri
+	 *
+	 * @return static
+	 */
+	final public static function to(string $uri)
+	{
+		// Check for a named or reverse-route
+		if ($route = Services::routes()->reverseRoute($uri))
+		{
+			return new static($route);
+		}
+
+		return new static($uri);
+	}
+
+	/**
+	 * Returns an instance representing the current URL.
+	 *
+	 * @return static
+	 */
+	final public static function current()
+	{
+		return static::fromRequest(Services::request());
+	}
+
+	/**
+	 * Returns an instance representing the URL from
+	 * an Incoming Request (as defined by Config\App).
+	 *
+	 * @param IncomingRequest $request
+	 *
+	 * @return static
+	 */
+	final public static function fromRequest(IncomingRequest $request)
+	{
+		$path  = $request->detectPath($request->config->uriProtocol);
+		$query = isset($_SERVER['QUERY_STRING']) ? '?' . $_SERVER['QUERY_STRING'] : '';
+
+		return new static($path . $query, $request->config);
+	}
+
+	//--------------------------------------------------------------------
+
+	/**
+	 * Store the App configuration and create the URI
+	 * instance from the relative path.
+	 *
+	 * @param string   $relativePath
+	 * @param App|null $config
+	 */
+	final public function __construct(string $relativePath = '', App $config = null)
+	{
+		$config = $config ?? config('App');
+
+		if ($config->baseURL === '')
+		{
+			throw new InvalidArgumentException('URL class requires a valid baseURL.');
+		}
+		if (is_int(strpos($relativePath, '://')))
+		{
+			throw new InvalidArgumentException('URL class only accepts relative paths.');
+		}
+
+		$this->relativePath = ltrim(URI::removeDotSegments($relativePath), '/');
+
+		// Build the full URL based on $config and $relativePath
+		$url = rtrim($config->baseURL, '/ ') . '/';
+
+		// Check for an index page
+		if ($config->indexPage !== '')
+		{
+			$url .= $config->indexPage;
+
+			// If the relative path has anything other than ? (for query) we need a separator
+			if ($this->relativePath !== '' && strncmp($this->relativePath, '?', 1) !== 0)
+			{
+				$url .= '/';
+			}
+		}
+
+		$url .= $this->relativePath;
+
+		$this->uri = new URI($url);
+
+		// Check if the baseURL scheme needs to be coerced into its secure version
+		if ($config->forceGlobalSecureRequests && $this->uri->getScheme() === 'http')
+		{
+			$this->uri->setScheme('https');
+		}
+	}
+
+	/**
+	 * Returns the path relative to baseUrl, loosely
+	 * what was passed to the constructor.
+	 *
+	 * @return string
+	 */
+	public function getPath(): string
+	{
+		return $this->relativePath;
+	}
+
+	/**
+	 * Returns the underlying URI instance.
+	 * In order for this instance to remain
+	 * immutable a clone is returned.
+	 *
+	 * @return URI
+	 */
+	public function getUri(): URI
+	{
+		return clone $this->uri;
+	}
+
+	/**
+	 * Returns this URL as a string.
+	 *
+	 * @return string
+	 */
+	public function __toString(): string
+	{
+		return (string) $this->uri;
+	}
+}