<?php
//////////////////////////////////////////////////////////////////////////////80
// Atheos Terminal
//////////////////////////////////////////////////////////////////////////////80
// Copyright (c) 2020 Liam Siira (liam@siira.io), distributed as-is and without
// warranty under the MIT License. See [root]/docs/LICENSE.md for more.
// This information must remain intact.
//////////////////////////////////////////////////////////////////////////////80
// Copyright (c) 2013 Codiad & Kent Safranski
// Source: https://github.com/Fluidbyte/Codiad-Terminal
//////////////////////////////////////////////////////////////////////////////80
require_once("../../common.php");

//////////////////////////////////////////////////////////////////////////////80
// Verify Session or Key
//////////////////////////////////////////////////////////////////////////////80
Common::checkSession();

//////////////////////////////////////////////////////////////////////////////80
// Globals
//////////////////////////////////////////////////////////////////////////////80
$project = SESSION("project");

define("PASSWORD", "terminal");
define("ROOT", Common::getWorkspacePath($project));
define("BLOCKED", "ssh,telnet");
// define("ENABLED", "java,ls,cd,echo,javac");
define("ENABLED", false);

//////////////////////////////////////////////////////////////////////////////80
// Terminal Class
//////////////////////////////////////////////////////////////////////////////80

class Terminal {

	//////////////////////////////////////////////////////////////////////////80
	// Constructor
	//////////////////////////////////////////////////////////////////////////80
	public function __construct() {
		if (!isset($_SESSION["activeDir"]) || !isset($_SESSION["activeDir"][$_SESSION["project"]]) || empty($_SESSION["activeDir"][$_SESSION["project"]])) {
			if (ROOT === "") {
				$output = Common::raw_execute("pwd");
				$_SESSION["activeDir"] = array([$_SESSION["project"]] => implode("\n", (array)$output["output"]));
			} else {
				$this->changeDir(ROOT);
			}
		} else {
			$this->changeDir($_SESSION["activeDir"][$_SESSION["project"]]);
		}
	}

	//////////////////////////////////////////////////////////////////////////80
	// Primary call
	//////////////////////////////////////////////////////////////////////////80
	public function process($str) {
		$cmd = $this->parseCommand($str);
		if ($cmd === "") return;
		$output = Common::raw_execute($cmd);
		return implode("\n", (array)$output["output"]);
	}

	//////////////////////////////////////////////////////////////////////////80
	// Parse command for special functions, blocks
	//////////////////////////////////////////////////////////////////////////80
	public function parseCommand($str) {

		// Explode command
		$command_parts = explode(" ", $str);

		// Handle "cd" command
		if (in_array("cd", $command_parts)) {
			$cd_key = array_search("cd", $command_parts);
			$cd_key++;

			$dir = $command_parts[$cd_key];

			$this->changeDir($dir);
			// Remove from command
			$str = str_replace("cd $dir", "", $str);
		}

		// Replace text editors with cat
		$editors = array("vim", "vi", "nano");
		$str = preg_replace("/^(".join("|", $editors).")/", "cat", trim($str));


		if (ENABLED) {
			// Handle enabled commands
			$enabled = explode(",", ENABLED);
			if (in_array($command_parts[0], $enabled) === false) {
				$str = "echo ERROR: Command not allowed";
			}
		} else {
			// Handle blocked commands
			$blocked = explode(",", BLOCKED === true);
			if (in_array($command_parts[0], $blocked)) {
				$str = "echo ERROR: Command not allowed";
			}
		}


		// Update exec command
		return $str . " 2>&1";
	}

	//////////////////////////////////////////////////////////////////////////80
	// Chnage Directory
	//////////////////////////////////////////////////////////////////////////80
	public function changeDir($dir) {
		chdir($dir);
		// Store new directory
		$_SESSION["activeDir"][$_SESSION["project"]] = exec("pwd");
	}
}

//////////////////////////////////////////////////////////////////////////////80
// Processing
//////////////////////////////////////////////////////////////////////////////80

$activeUser = SESSION("user");
$command = POST("command");

if (strtolower($command === "exit")) {
	$_SESSION["term_auth"] = false;
	$output = "[EXIT]";

} else if (!isset($_SESSION["term_auth"]) || $_SESSION["term_auth"] !== true) {
	if ($command === PASSWORD) {
		$_SESSION["term_auth"] = true;
		$output = "[AUTHENTICATED]";
	} else {
		$output = "Enter Password:";
	}

} else {
	$Terminal = new Terminal();
	$output = "";
	$command = explode(" && ", $command);
	debug($command);
	foreach ($command as $c) {
		$output .= $Terminal->process($c);
		// $output .= implode("\n",$Terminal->process($c));
	}
}

$output = array(
	"data" => htmlentities($output),
	"dir" => htmlentities(exec("pwd")),
	"prompt" => "<span class=\"user\">$activeUser</span>:<span class=\"path\">" . exec("pwd") . "</span>$ "
);

Common::send("success", $output);

?>