initial commit

lib/rack.php

@@ -0,0 +1,176 @@
+<?php
+/*
+
+   PHP Rack
+
+   Copyright (c) 2010 Jim Myhrberg.
+
+   Permission is hereby granted, free of charge, to any person obtaining
+   a copy of this software and associated documentation files (the
+   'Software'), to deal in the Software without restriction, including
+   without limitation the rights to use, copy, modify, merge, publish,
+   distribute, sublicense, and/or sell copies of the Software, and to
+   permit persons to whom the Software is furnished to do so, subject to
+   the following conditions:
+
+   The above copyright notice and this permission notice shall be
+   included in all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+   IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+   CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+   TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+   SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
+class Rack {
+	
+	public static
+		$middleware = array(),
+		$env = array();
+	
+	private static
+		# default headers
+		$headers = array("Content-Type" => "text/html"),
+		$constructed = false,
+		$ob_started = false;
+	
+	
+	public static function init ($middleware = array()) {
+		
+		// quick initialization
+		if ( !empty($middleware) && is_array($middleware) ) {
+			self::$middleware = array_merge(self::$middleware, $middleware);
+		}
+		
+		// don't output anything before Rack has output it's headers
+		ob_start();
+		self::$ob_started = true;
+	}
+	
+	
+	public static function add ($name, $file = null) {
+		if ( !self::$ob_started ) self::init();
+		if ( !self::$constructed ) {
+			self::$middleware[$name] = true;
+			self::require_file($file);
+			return true;
+		}
+		return false;
+	}
+	
+	
+	public static function insert_before ($target, $name, $file = null) {
+		if ( !self::$ob_started ) self::init();
+		if ( !self::$constructed ) {
+			if ( array_key_exists($target, self::$middleware) ) {
+				$keys = array_keys(self::$middleware);
+				$length = count($keys);
+				$middleware = array();
+				for ( $i=0; $i < $length; $i++ ) {
+					if ( $keys[$i] == $target ) {
+						$middleware[$name] = true;
+					}
+					$middleware[$keys[$i]] =& self::$middleware[$keys[$i]];
+				}
+				self::$middleware = $middleware;
+				self::require_file($file);
+				return true;
+			}
+		}
+		return false;
+	}
+	
+	
+	public static function insert_after ($target, $name, $file = null) {
+		if ( !self::$ob_started ) self::init();
+		if ( !self::$constructed ) {
+			if ( array_key_exists($target, self::$middleware) ) {
+				$keys = array_keys(self::$middleware);
+				$length = count($keys);
+				$middleware = array();
+				for ( $i=0; $i < $length; $i++ ) {
+					$middleware[$keys[$i]] =& self::$middleware[$keys[$i]];
+					if ( $keys[$i] == $target ) {
+						$middleware[$name] = true;
+					}
+				}
+				self::$middleware = $middleware;
+				self::require_file($file);
+				return false;
+			}
+		}
+		return false;
+	}
+	
+	
+	public static function not_found () {
+		return array(404, array("Content-Type" => "text/html"), "Not Found");
+	}
+	
+	
+	public static function run () {
+		
+		// build ENV
+		self::$env =& $_SERVER;
+		if ( strstr($_SERVER['REQUEST_URI'], '?') ) {
+			self::$env["PATH_INFO"] = substr($_SERVER['REQUEST_URI'], 0, strpos($_SERVER['REQUEST_URI'], '?'));
+		} else {	
+			self::$env["PATH_INFO"] = $_SERVER['REQUEST_URI'];
+		}
+		self::$env["request.vars"] =& $_REQUEST;
+		self::$env["request.get"] =& $_GET;
+		self::$env["request.post"] =& $_POST;
+		self::$env["request.files"] =& $_FILES;
+		self::$env["request.method"] =& $_SERVER["REQUEST_METHOD"];
+		self::$env["cookies"] =& $_COOKIE;
+		
+		// construct middlewares
+		self::$constructed = true;
+		$middleware = array_reverse(self::$middleware);
+		$previous = null;
+		foreach( $middleware as $key => $value ) {
+			self::$middleware[$key] = new $key($previous);
+			$previous =& self::$middleware[$key];
+		}
+		
+		// call the middleware stack
+		reset(self::$middleware);
+		$first = current(array_keys(self::$middleware));
+		list($status, $headers, $body) = self::$middleware[$first]->call(self::$env);
+		
+		// send headers
+		header(self::$env["SERVER_PROTOCOL"]." ".$status);
+		$headers = array_merge(self::$headers, $headers);
+		foreach( $headers as $key => $value ) {
+			header($key.": ".$value);
+		}
+		
+		// output any buffered content from middlewares
+		$buffer = ob_get_contents();
+		ob_end_clean();
+		if ( !empty($buffer) ) {
+			echo $buffer;
+		}
+		
+		// output body
+		if ( is_array($body) ) {
+			echo implode("", $body);
+		} else {
+			echo $body;
+		}
+	}
+	
+	
+	private static function require_file ($file = null) {
+		if ( $file != null && is_file($file) ) {
+			require($file);
+		}
+	}
+	
+}
+
+?>