From 84e2b2be6f7537e0a4a9f0c323555404d2682a8a Mon Sep 17 00:00:00 2001
From: Thomas Lange <code@nerdmind.de>
Date: Thu, 29 Aug 2019 18:45:48 +0200
Subject: Add HTTP class

This class was written in 2015 and originally had it's own repository. I decided to include it to the snippets repository because this piece of code does not need it's own repository.
---
 PHP/HTTP-Class/include/HTTP.php | 221 ++++++++++++++++++++++++++++++++++++++++
 PHP/HTTP-Class/index.php        |  71 +++++++++++++
 2 files changed, 292 insertions(+)
 create mode 100755 PHP/HTTP-Class/include/HTTP.php
 create mode 100755 PHP/HTTP-Class/index.php

diff --git a/PHP/HTTP-Class/include/HTTP.php b/PHP/HTTP-Class/include/HTTP.php
new file mode 100755
index 0000000..5d609ff
--- /dev/null
+++ b/PHP/HTTP-Class/include/HTTP.php
@@ -0,0 +1,221 @@
+<?php
+#%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#
+# HTTP class                                                                   #
+#%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#
+#                                                                              #
+# Simple static class with more or less useful methods to simplify some checks #
+# for the current HTTP request which was sent by the client.                   #
+#                                                                              #
+#%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#
+class HTTP {
+	private static $GET  = NULL;
+	private static $POST = NULL;
+	private static $FILE = NULL;
+
+	#===============================================================================
+	# HTTP protocol versions
+	#===============================================================================
+	const HTTP_VERSION_1_0 = 'HTTP/1.0';
+	const HTTP_VERSION_1_1 = 'HTTP/1.1';
+	const HTTP_VERSION_2_0 = 'HTTP/2.0';
+
+	#===============================================================================
+	# HTTP header fields
+	#===============================================================================
+	const HEADER_CONTENT_TYPE      = 'Content-Type';
+	const HEADER_TRANSFER_ENCODING = 'Transfer-Encoding';
+	const HEADER_ACCESS_CONTROL    = 'Access-Control-Allow-Origin';
+
+	#===============================================================================
+	# Values for HTTP header fields
+	#===============================================================================
+	const CONTENT_TYPE_JSCRIPT = 'application/x-javascript; charset=UTF-8';
+	const CONTENT_TYPE_TEXT    = 'text/plain; charset=UTF-8';
+	const CONTENT_TYPE_HTML    = 'text/html; charset=UTF-8';
+	const CONTENT_TYPE_JSON    = 'application/json; charset=UTF-8';
+	const CONTENT_TYPE_XML     = 'text/xml; charset=UTF-8';
+
+	#===============================================================================
+	# Initialize $GET, $POST and $FILE
+	#===============================================================================
+	public static function init($trimValues = TRUE) {
+		self::$GET  = ($trimValues === TRUE ? self::trim($_GET)  : $_GET );
+		self::$POST = ($trimValues === TRUE ? self::trim($_POST) : $_POST);
+		self::$FILE = $_FILES;
+	}
+
+	#===============================================================================
+	# Return a HTTP status code header description
+	#===============================================================================
+	private static function getStatuscode($code) {
+		return [
+			200 => 'OK',
+			301 => 'Moved Permanently',
+			302 => 'Found',
+			303 => 'See Other',
+			307 => 'Temporary Redirect',
+			400 => 'Bad Request',
+			401 => 'Authorization Required',
+			403 => 'Forbidden',
+			404 => 'Not Found',
+			500 => 'Internal Server Error',
+			503 => 'Service Temporarily Unavailable',
+		][$code];
+	}
+
+	#===============================================================================
+	# Trim all strings in argument
+	#===============================================================================
+	private static function trim($mixed) {
+		if(is_array($mixed)) {
+			return array_map('self::trim', $mixed);
+		}
+
+		return trim($mixed);
+	}
+
+	#===============================================================================
+	# Check if all elements of $arguments are set as key of $data
+	#===============================================================================
+	private static function issetData($data, $arguments) {
+		foreach($arguments as $key) {
+			if(is_array($key)) {
+				if(!isset($data[key($key)]) OR $data[key($key)] !== $key[key($key)]) {
+					return FALSE;
+				}
+			}
+
+			else if(!isset($data[$key]) OR !is_string($data[$key])) {
+				return FALSE;
+			}
+		}
+
+		return TRUE;
+	}
+
+	#===============================================================================
+	# Return null or the value (if set) from one of the three requests attributes
+	#===============================================================================
+	public static function returnKey($data, Array $paths) {
+		$current = &$data;
+
+		foreach($paths as $path) {
+			if(!isset($current[$path]) OR (!is_string($current[$path]) AND !is_array($current[$path]))) {
+				return NULL;
+			}
+			$current = &$current[$path];
+		}
+
+		return $current;
+	}
+
+	#===============================================================================
+	# Return GET value
+	#===============================================================================
+	public static function GET() {
+		return self::returnKey(self::$GET, func_get_args());
+	}
+
+	#===============================================================================
+	# Return POST value
+	#===============================================================================
+	public static function POST() {
+		return self::returnKey(self::$POST, func_get_args());
+	}
+
+	#===============================================================================
+	# Return FILE value
+	#===============================================================================
+	public static function FILE() {
+		return self::returnKey(self::$FILE, func_get_args());
+	}
+
+	#===============================================================================
+	# Check if all elements of func_get_args() are set key of self::$POST
+	#===============================================================================
+	public static function issetPOST() {
+		return self::issetData(self::$POST, func_get_args());
+	}
+
+	#===============================================================================
+	# Check if all elements of func_get_args() are set key of self::$GET
+	#===============================================================================
+	public static function issetGET() {
+		return self::issetData(self::$GET, func_get_args());
+	}
+
+	#===============================================================================
+	# Check if all elements of func_get_args() are set key of self::$FILE
+	#===============================================================================
+	public static function issetFILE() {
+		return self::issetData(self::$FILE, func_get_args());
+	}
+
+	#===============================================================================
+	# Return HTTP request method or check if request method equals with $method
+	#===============================================================================
+	public static function requestMethod($method = NULL) {
+		if(!empty($method)) {
+			return ($_SERVER['REQUEST_METHOD'] === $method);
+		}
+
+		return $_SERVER['REQUEST_METHOD'];
+	}
+
+	#===============================================================================
+	# Return REQUEST_URI
+	#===============================================================================
+	public static function requestURI() {
+		return $_SERVER['REQUEST_URI'] ?? FALSE;
+	}
+
+	#===============================================================================
+	# Return HTTP_USER_AGENT
+	#===============================================================================
+	public static function useragent() {
+		return trim($_SERVER['HTTP_USER_AGENT'] ?? '');
+	}
+
+	#===============================================================================
+	# Return HTTP_REFERER
+	#===============================================================================
+	public static function referer() {
+		return trim($_SERVER['HTTP_REFERER'] ?? '');
+	}
+
+	#===============================================================================
+	# Return response status
+	#===============================================================================
+	public static function responseStatus($code = NULL) {
+		if(!empty($code)) {
+			self::sendHeader(sprintf('HTTP/1.1 %d %s', $code, self::getStatuscode($code)));
+		}
+		return http_response_code();
+	}
+
+	#===============================================================================
+	# Send a HTTP header line to the client
+	#===============================================================================
+	public static function responseHeader($field, $value) {
+		self::sendHeader("{$field}: {$value}");
+	}
+
+	#===============================================================================
+	# Send a HTTP redirect to the client
+	#===============================================================================
+	public static function redirect($location, $code = 303, $exit = TRUE) {
+		self::sendHeader(sprintf('HTTP/1.1 %d %s', $code, self::getStatuscode($code)));
+		self::sendHeader("Location: {$location}");
+		$exit AND exit();
+	}
+
+	#===============================================================================
+	# Send a new HTTP header line to the client if headers are not already sent
+	#===============================================================================
+	private static function sendHeader($header) {
+		if(!headers_sent()) {
+			header($header);
+		}
+	}
+}
+?>
\ No newline at end of file
diff --git a/PHP/HTTP-Class/index.php b/PHP/HTTP-Class/index.php
new file mode 100755
index 0000000..cc52561
--- /dev/null
+++ b/PHP/HTTP-Class/index.php
@@ -0,0 +1,71 @@
+<?php
+#==============================================================================
+# Include HTTP class
+#==============================================================================
+require_once 'include/HTTP.php';
+
+#==============================================================================
+# Initialize HTTP class
+#==============================================================================
+HTTP::init();
+
+#==============================================================================
+# Check if GET parameters are set
+#==============================================================================
+if(HTTP::issetGET('parameter_one', 'parameter_two', 'parameter_three')) {
+	$parameter_one = HTTP::GET('parameter_one');
+	$parameter_two = HTTP::GET('parameter_two');
+
+	var_dump($parameter_one, $parameter_two, HTTP::GET('parameter_three'));
+}
+
+#==============================================================================
+# Check if POST parameters are set
+#==============================================================================
+if(HTTP::issetPOST('parameter_one', 'parameter_two', 'parameter_three')) {
+	$parameter_one = HTTP::POST('parameter_one');
+	$parameter_two = HTTP::POST('parameter_two');
+
+	var_dump($parameter_one, $parameter_two, HTTP::POST('parameter_three'));
+}
+
+#==============================================================================
+# Check if POST parameters in conjunction with a specific value are set
+#==============================================================================
+if(HTTP::issetPOST('parameter_one', 'parameter_two', ['parameter_three' => 'value_three'])) {
+	// do something
+}
+
+#==============================================================================
+# Check the HTTP request method
+#==============================================================================
+if(HTTP::requestMethod('GET') OR HTTP::requestMethod('POST') OR HTTP::requestMethod('HEAD')) {
+	// do something
+}
+
+#==============================================================================
+# Get the HTTP request method
+#==============================================================================
+$requestMethod = HTTP::requestMethod();
+
+#==============================================================================
+# Get the HTTP status code of the current request
+#==============================================================================
+$statusCode = HTTP::responseStatus();
+
+#==============================================================================
+# Send a HTTP status code to the client
+#==============================================================================
+HTTP::responseStatus(200);
+
+#==============================================================================
+# Send a custom HTTP response header to the client
+#==============================================================================
+HTTP::responseHeader(HTTP::HEADER_CONTENT_TYPE, HTTP::CONTENT_TYPE_TEXT);
+
+#==============================================================================
+# Send a HTTP redirect to the client and stop script execution
+#==============================================================================
+# HTTP::redirect('https://example.org/');
+# HTTP::redirect('https://example.org/', 303);
+?>
\ No newline at end of file
-- 
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