734 lines
26 KiB
PHP
734 lines
26 KiB
PHP
<?php defined('BASEPATH') or exit('No direct script access allowed');
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/**
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* REST_controller V 2.5.x
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*
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* @see https://github.com/philsturgeon/codeigniter-restserver
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*
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*/
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class REST_Controller extends CI_Controller
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{
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protected $rest_format = null; // Set this in a controller to use a default format
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protected $methods = array(); // contains a list of method properties such as limit, log and level
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protected $request = null; // Stores accept, language, body, headers, etc
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protected $response = null; // What is gonna happen in output?
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public $rest = null; // Stores DB, keys, key level, etc
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protected $_get_args = array();
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protected $_post_args = array();
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protected $_put_args = array();
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protected $_delete_args = array();
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protected $_args = array();
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protected $_allow = true;
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// List all supported methods, the first will be the default format
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protected $_supported_formats = array(
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'xml' => 'application/xml',
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'rawxml' => 'application/xml',
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'json' => 'application/json',
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'jsonp' => 'application/javascript',
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'serialized' => 'application/vnd.php.serialized',
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'php' => 'text/plain',
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'html' => 'text/html',
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'csv' => 'application/csv',
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);
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// Constructor function
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public function __construct()
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{
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parent::__construct();
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// Lets grab the config and get ready to party
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$this->load->config('rest');
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if (empty($this->request)) {
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$this->request = new stdClass;
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}
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if (empty($this->rest)) {
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$this->rest = new stdClass;
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}
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// How is this request being made? POST, DELETE, GET, PUT?
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$this->request->method = $this->_detect_method();
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// Set up our GET variables
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$this->_get_args = array_merge($this->_get_args, $this->uri->ruri_to_assoc());
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//$this->load->library('security');
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// This library is bundled with REST_Controller 2.5+, but will eventually be part of CodeIgniter itself
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$this->load->library('format');
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// Try to find a format for the request (means we have a request body)
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$this->request->format = $this->_detect_input_format();
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// Some Methods cant have a body
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$this->request->body = null;
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switch ($this->request->method) {
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case 'get':
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// Grab proper GET variables
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parse_str(parse_url($_SERVER['REQUEST_URI'], PHP_URL_QUERY), $get);
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// If there are any, populate $this->_get_args
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empty($get) or $this->_get_args = $get;
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break;
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case 'post':
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$this->_post_args = $_POST;
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$this->request->format and $this->request->body = file_get_contents('php://input');
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break;
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case 'put':
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// It might be a HTTP body
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if ($this->request->format) {
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$this->request->body = file_get_contents('php://input');
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}
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// If no file type is provided, this is probably just arguments
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else {
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parse_str(file_get_contents('php://input'), $this->_put_args);
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}
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break;
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case 'delete':
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// Set up out DELETE variables (which shouldn't really exist, but sssh!)
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parse_str(file_get_contents('php://input'), $this->_delete_args);
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break;
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}
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// Now we know all about our request, let's try and parse the body if it exists
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if ($this->request->format and $this->request->body) {
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$this->request->body = $this->format->factory($this->request->body, $this->request->format)->to_data();
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}
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// Merge both for one mega-args variable
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$this->_args = array_merge($this->_get_args, $this->_put_args, $this->_post_args, $this->_delete_args);
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// Which format should the data be returned in?
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if (empty($this->response)) {
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$this->response = new stdClass;
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}
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$this->response->format = $this->_detect_output_format();
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// Which format should the data be returned in?
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$this->response->lang = $this->_detect_lang();
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// Check if there is a specific auth type for the current class/method
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$this->auth_override = $this->_auth_override_check();
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// When there is no specific override for the current class/method, use the default auth value set in the config
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if ($this->auth_override !== true) {
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if ($this->config->item('rest_auth') == 'basic') {
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$this->_prepare_basic_auth();
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} elseif ($this->config->item('rest_auth') == 'digest') {
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$this->_prepare_digest_auth();
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}
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}
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// Load DB if its enabled
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// if (config_item('rest_database_group') AND (config_item('rest_enable_keys') OR config_item('rest_enable_logging')))
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// {
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$this->rest->db = $this->load->database(config_item('rest_database_group'), true);
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// }
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// Checking for keys? GET TO WORK!
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if (config_item('rest_enable_keys')) {
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$this->_allow = $this->_detect_api_key();
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}
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// only allow ajax requests
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if (!$this->input->is_ajax_request() and config_item('rest_ajax_only')) {
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$this->response(array('status' => false, 'error' => 'Only AJAX requests are accepted.'), 505);
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}
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}
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/*
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* Remap
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*
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* Requests are not made to methods directly The request will be for an "object".
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* this simply maps the object and method to the correct Controller method.
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*/
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public function _remap($object_called, $arguments)
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{
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$pattern = '/^(.*)\.(' . implode('|', array_keys($this->_supported_formats)) . ')$/';
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if (preg_match($pattern, $object_called, $matches)) {
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$object_called = $matches[1];
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}
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$controller_method = $object_called . '_' . $this->request->method;
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// Do we want to log this method (if allowed by config)?
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$log_method = !(isset($this->methods[$controller_method]['log']) and $this->methods[$controller_method]['log'] == false);
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// Use keys for this method?
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$use_key = !(isset($this->methods[$controller_method]['key']) and $this->methods[$controller_method]['key'] == false);
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// Get that useless shitty key out of here
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if (config_item('rest_enable_keys') and $use_key and $this->_allow === false) {
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if (config_item('rest_enable_logging') and $log_method) {
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$this->_log_request();
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}
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$this->response(array('status' => false, 'error' => 'Invalid API Key.'), 403);
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}
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// Sure it exists, but can they do anything with it?
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if (!method_exists($this, $controller_method)) {
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$this->response(array('status' => false, 'error' => 'Unknown method.'), 404);
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}
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// Doing key related stuff? Can only do it if they have a key right?
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if (config_item('rest_enable_keys') and !empty($this->rest->key)) {
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// Check the limit
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if (config_item('rest_enable_limits') and !$this->_check_limit($controller_method)) {
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$this->response(array('status' => false, 'error' => 'This API key has reached the hourly limit for this method.'), 401);
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}
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// If no level is set use 0, they probably aren't using permissions
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$level = isset($this->methods[$controller_method]['level']) ? $this->methods[$controller_method]['level'] : 0;
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// If no level is set, or it is lower than/equal to the key's level
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$authorized = $level <= $this->rest->level;
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// IM TELLIN!
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if (config_item('rest_enable_logging') and $log_method) {
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$this->_log_request($authorized);
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}
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// They don't have good enough perms
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$authorized or $this->response(array('status' => false, 'error' => 'This API key does not have enough permissions.'), 401);
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}
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// No key stuff, but record that stuff is happening
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else if (config_item('rest_enable_logging') and $log_method) {
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$this->_log_request($authorized = true);
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}
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// And...... GO!
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call_user_func_array(array($this, $controller_method), $arguments);
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}
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/*
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* response
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*
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* Takes pure data and optionally a status code, then creates the response
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*/
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public function response($data = array(), $http_code = null)
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{
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// If data is empty and not code provide, error and bail
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if (empty($data) && $http_code === null) {
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$http_code = 404;
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}
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// Otherwise (if no data but 200 provided) or some data, carry on camping!
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else {
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is_numeric($http_code) or $http_code = 200;
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// If the format method exists, call and return the output in that format
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if (method_exists($this, '_format_' . $this->response->format)) {
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// Set the correct format header
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header('Content-Type: ' . $this->_supported_formats[$this->response->format]);
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$output = $this->{'_format_' . $this->response->format}($data);
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}
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// If the format method exists, call and return the output in that format
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elseif (method_exists($this->format, 'to_' . $this->response->format)) {
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// Set the correct format header
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header('Content-Type: ' . $this->_supported_formats[$this->response->format]);
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$output = $this->format->factory($data)->{'to_' . $this->response->format}();
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}
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// Format not supported, output directly
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else {
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$output = $data;
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}
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}
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header('HTTP/1.1: ' . $http_code);
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header('Status: ' . $http_code);
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header('Content-Length: ' . strlen($output));
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exit($output);
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}
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protected function res($code = 200, $message = 'Success', $data = null)
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{
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$this->response(array('code' => $code, 'message' => $message, 'data' => $data), 200);
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}
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/*
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* Detect input format
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*
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* Detect which format the HTTP Body is provided in
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*/
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protected function _detect_input_format()
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{
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if ($this->input->server('CONTENT_TYPE')) {
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// Check all formats against the HTTP_ACCEPT header
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foreach ($this->_supported_formats as $format => $mime) {
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if (strpos($match = $this->input->server('CONTENT_TYPE'), ';')) {
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$match = current(explode(';', $match));
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}
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if ($match == $mime) {
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return $format;
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}
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}
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}
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return null;
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}
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/*
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* Detect format
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*
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* Detect which format should be used to output the data
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*/
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protected function _detect_output_format()
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{
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$pattern = '/\.(' . implode('|', array_keys($this->_supported_formats)) . ')$/';
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// Check if a file extension is used
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if (preg_match($pattern, $this->uri->uri_string(), $matches)) {
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return $matches[1];
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}
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// Check if a file extension is used
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elseif ($this->_get_args and !is_array(end($this->_get_args)) and preg_match($pattern, end($this->_get_args), $matches)) {
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// The key of the last argument
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$last_key = end(array_keys($this->_get_args));
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// Remove the extension from arguments too
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$this->_get_args[$last_key] = preg_replace($pattern, '', $this->_get_args[$last_key]);
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$this->_args[$last_key] = preg_replace($pattern, '', $this->_args[$last_key]);
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return $matches[1];
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}
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// A format has been passed as an argument in the URL and it is supported
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if (isset($this->_get_args['format']) and array_key_exists($this->_get_args['format'], $this->_supported_formats)) {
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return $this->_get_args['format'];
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}
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// Otherwise, check the HTTP_ACCEPT (if it exists and we are allowed)
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if ($this->config->item('rest_ignore_http_accept') === false and $this->input->server('HTTP_ACCEPT')) {
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// Check all formats against the HTTP_ACCEPT header
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foreach (array_keys($this->_supported_formats) as $format) {
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// Has this format been requested?
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if (strpos($this->input->server('HTTP_ACCEPT'), $format) !== false) {
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// If not HTML or XML assume its right and send it on its way
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if ($format != 'html' and $format != 'xml') {
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return $format;
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}
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// HTML or XML have shown up as a match
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else {
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// If it is truely HTML, it wont want any XML
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if ($format == 'html' and strpos($this->input->server('HTTP_ACCEPT'), 'xml') === false) {
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return $format;
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}
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// If it is truely XML, it wont want any HTML
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elseif ($format == 'xml' and strpos($this->input->server('HTTP_ACCEPT'), 'html') === false) {
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return $format;
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}
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}
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}
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}
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} // End HTTP_ACCEPT checking
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// Well, none of that has worked! Let's see if the controller has a default
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if (!empty($this->rest_format)) {
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return $this->rest_format;
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}
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// Just use the default format
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return config_item('rest_default_format');
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}
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/*
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* Detect method
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*
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* Detect which method (POST, PUT, GET, DELETE) is being used
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*/
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protected function _detect_method()
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{
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$method = strtolower($this->input->server('REQUEST_METHOD'));
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if ($this->config->item('enable_emulate_request') && $this->input->post('_method')) {
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$method = $this->input->post('_method');
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}
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if (in_array($method, array('get', 'delete', 'post', 'put'))) {
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return $method;
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}
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return 'get';
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}
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/*
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* Detect API Key
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*
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* See if the user has provided an API key
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*/
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protected function _detect_api_key()
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{
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// Get the api key name variable set in the rest config file
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$api_key_variable = config_item('rest_key_name');
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// Work out the name of the SERVER entry based on config
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$key_name = 'HTTP_' . strtoupper(str_replace('-', '_', $api_key_variable));
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$this->rest->key = null;
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$this->rest->level = null;
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$this->rest->ignore_limits = false;
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// Find the key from server or arguments
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if ($key = isset($this->_args[$api_key_variable]) ? $this->_args[$api_key_variable] : $this->input->server($key_name)) {
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if (!$row = $this->rest->db->where('key', $key)->get(config_item('rest_keys_table'))->row()) {
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return false;
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}
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$this->rest->key = $row->key;
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isset($row->level) and $this->rest->level = $row->level;
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isset($row->ignore_limits) and $this->rest->ignore_limits = $row->ignore_limits;
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return true;
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}
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// No key has been sent
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return false;
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}
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/*
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* Detect language(s)
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*
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* What language do they want it in?
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*/
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protected function _detect_lang()
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{
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if (!$lang = $this->input->server('HTTP_ACCEPT_LANGUAGE')) {
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return null;
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}
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// They might have sent a few, make it an array
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if (strpos($lang, ',') !== false) {
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$langs = explode(',', $lang);
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$return_langs = array();
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$i = 1;
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foreach ($langs as $lang) {
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// Remove weight and strip space
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list($lang) = explode(';', $lang);
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$return_langs[] = trim($lang);
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}
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return $return_langs;
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}
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// Nope, just return the string
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return $lang;
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}
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/*
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* Log request
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*
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* Record the entry for awesomeness purposes
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*/
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protected function _log_request($authorized = false)
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{
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return $this->rest->db->insert(config_item('rest_logs_table'), array(
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'uri' => $this->uri->uri_string(),
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'method' => $this->request->method,
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'params' => serialize($this->_args),
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'api_key' => isset($this->rest->key) ? $this->rest->key : '',
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'ip_address' => $this->input->ip_address(),
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'time' => function_exists('now') ? now() : time(),
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'authorized' => $authorized,
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));
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}
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/*
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* Log request
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*
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* Record the entry for awesomeness purposes
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*/
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protected function _check_limit($controller_method)
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{
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// They are special, or it might not even have a limit
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if (!empty($this->rest->ignore_limits) or !isset($this->methods[$controller_method]['limit'])) {
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// On your way sonny-jim.
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return true;
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}
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// How many times can you get to this method an hour?
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$limit = $this->methods[$controller_method]['limit'];
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// Get data on a keys usage
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$result = $this->rest->db
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->where('uri', $this->uri->uri_string())
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->where('api_key', $this->rest->key)
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->get(config_item('rest_limits_table'))
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->row();
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// No calls yet, or been an hour since they called
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if (!$result or $result->hour_started < time() - (60 * 60)) {
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// Right, set one up from scratch
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$this->rest->db->insert(config_item('rest_limits_table'), array(
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'uri' => $this->uri->uri_string(),
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'api_key' => isset($this->rest->key) ? $this->rest->key : '',
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'count' => 1,
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'hour_started' => time(),
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));
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}
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// They have called within the hour, so lets update
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else {
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// Your luck is out, you've called too many times!
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if ($result->count >= $limit) {
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return false;
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}
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$this->rest->db
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->where('uri', $this->uri->uri_string())
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->where('api_key', $this->rest->key)
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->set('count', 'count + 1', false)
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->update(config_item('rest_limits_table'));
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}
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return true;
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}
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/*
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* Auth override check
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*
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* Check if there is a specific auth type set for the current class/method being called
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*/
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|
|
protected function _auth_override_check()
|
|
{
|
|
|
|
// Assign the class/method auth type override array from the config
|
|
$this->overrides_array = $this->config->item('auth_override_class_method');
|
|
|
|
// Check to see if the override array is even populated, otherwise return false
|
|
if (empty($this->overrides_array)) {
|
|
return false;
|
|
}
|
|
|
|
// Check to see if there's an override value set for the current class/method being called
|
|
if (empty($this->overrides_array[$this->router->class][$this->router->method])) {
|
|
return false;
|
|
}
|
|
|
|
// None auth override found, prepare nothing but send back a true override flag
|
|
if ($this->overrides_array[$this->router->class][$this->router->method] == 'none') {
|
|
return true;
|
|
}
|
|
|
|
// Basic auth override found, prepare basic
|
|
if ($this->overrides_array[$this->router->class][$this->router->method] == 'basic') {
|
|
$this->_prepare_basic_auth();
|
|
return true;
|
|
}
|
|
|
|
// Digest auth override found, prepare digest
|
|
if ($this->overrides_array[$this->router->class][$this->router->method] == 'digest') {
|
|
$this->_prepare_digest_auth();
|
|
return true;
|
|
}
|
|
|
|
// Return false when there is an override value set but it doesn't match 'basic', 'digest', or 'none'. (the value was misspelled)
|
|
return false;
|
|
}
|
|
|
|
// INPUT FUNCTION --------------------------------------------------------------
|
|
|
|
public function get($key = null, $xss_clean = true)
|
|
{
|
|
if ($key === null) {
|
|
return $this->_get_args;
|
|
}
|
|
|
|
return array_key_exists($key, $this->_get_args) ? $this->_xss_clean($this->_get_args[$key], $xss_clean) : false;
|
|
}
|
|
|
|
public function post($key = null, $xss_clean = true)
|
|
{
|
|
if ($key === null) {
|
|
return $this->_post_args;
|
|
}
|
|
|
|
return $this->input->post($key, $xss_clean);
|
|
}
|
|
|
|
public function put($key = null, $xss_clean = true)
|
|
{
|
|
if ($key === null) {
|
|
return $this->_put_args;
|
|
}
|
|
|
|
return array_key_exists($key, $this->_put_args) ? $this->_xss_clean($this->_put_args[$key], $xss_clean) : false;
|
|
}
|
|
|
|
public function delete($key = null, $xss_clean = true)
|
|
{
|
|
if ($key === null) {
|
|
return $this->_delete_args;
|
|
}
|
|
|
|
return array_key_exists($key, $this->_delete_args) ? $this->_xss_clean($this->_delete_args[$key], $xss_clean) : false;
|
|
}
|
|
|
|
protected function _xss_clean($val, $bool)
|
|
{
|
|
if (CI_VERSION < 2) {
|
|
return $bool ? $this->input->xss_clean($val) : $val;
|
|
} else {
|
|
return $bool ? $this->security->xss_clean($val) : $val;
|
|
}
|
|
}
|
|
|
|
public function validation_errors()
|
|
{
|
|
$string = strip_tags($this->form_validation->error_string());
|
|
|
|
return explode("\n", trim($string, "\n"));
|
|
}
|
|
|
|
// SECURITY FUNCTIONS ---------------------------------------------------------
|
|
|
|
protected function _check_login($username = '', $password = null)
|
|
{
|
|
if (empty($username)) {
|
|
return false;
|
|
}
|
|
|
|
$valid_logins = &$this->config->item('rest_valid_logins');
|
|
|
|
if (!array_key_exists($username, $valid_logins)) {
|
|
return false;
|
|
}
|
|
|
|
// If actually NULL (not empty string) then do not check it
|
|
if ($password !== null and $valid_logins[$username] != $password) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
protected function _prepare_basic_auth()
|
|
{
|
|
$username = null;
|
|
$password = null;
|
|
|
|
// mod_php
|
|
if ($this->input->server('PHP_AUTH_USER')) {
|
|
$username = $this->input->server('PHP_AUTH_USER');
|
|
$password = $this->input->server('PHP_AUTH_PW');
|
|
}
|
|
|
|
// most other servers
|
|
elseif ($this->input->server('HTTP_AUTHENTICATION')) {
|
|
if (strpos(strtolower($this->input->server('HTTP_AUTHENTICATION')), 'basic') === 0) {
|
|
list($username, $password) = explode(':', base64_decode(substr($this->input->server('HTTP_AUTHORIZATION'), 6)));
|
|
}
|
|
}
|
|
|
|
if (!$this->_check_login($username, $password)) {
|
|
$this->_force_login();
|
|
}
|
|
}
|
|
|
|
protected function _prepare_digest_auth()
|
|
{
|
|
$uniqid = uniqid(""); // Empty argument for backward compatibility
|
|
// We need to test which server authentication variable to use
|
|
// because the PHP ISAPI module in IIS acts different from CGI
|
|
if ($this->input->server('PHP_AUTH_DIGEST')) {
|
|
$digest_string = $this->input->server('PHP_AUTH_DIGEST');
|
|
} elseif ($this->input->server('HTTP_AUTHORIZATION')) {
|
|
$digest_string = $this->input->server('HTTP_AUTHORIZATION');
|
|
} else {
|
|
$digest_string = "";
|
|
}
|
|
|
|
/* The $_SESSION['error_prompted'] variabile is used to ask
|
|
the password again if none given or if the user enters
|
|
a wrong auth. informations. */
|
|
if (empty($digest_string)) {
|
|
$this->_force_login($uniqid);
|
|
}
|
|
|
|
// We need to retrieve authentication informations from the $auth_data variable
|
|
preg_match_all('@(username|nonce|uri|nc|cnonce|qop|response)=[\'"]?([^\'",]+)@', $digest_string, $matches);
|
|
$digest = array_combine($matches[1], $matches[2]);
|
|
|
|
if (!array_key_exists('username', $digest) or !$this->_check_login($digest['username'])) {
|
|
$this->_force_login($uniqid);
|
|
}
|
|
|
|
$valid_logins = &$this->config->item('rest_valid_logins');
|
|
$valid_pass = $valid_logins[$digest['username']];
|
|
|
|
// This is the valid response expected
|
|
$A1 = md5($digest['username'] . ':' . $this->config->item('rest_realm') . ':' . $valid_pass);
|
|
$A2 = md5(strtoupper($this->request->method) . ':' . $digest['uri']);
|
|
$valid_response = md5($A1 . ':' . $digest['nonce'] . ':' . $digest['nc'] . ':' . $digest['cnonce'] . ':' . $digest['qop'] . ':' . $A2);
|
|
|
|
if ($digest['response'] != $valid_response) {
|
|
header('HTTP/1.0 401 Unauthorized');
|
|
header('HTTP/1.1 401 Unauthorized');
|
|
exit;
|
|
}
|
|
}
|
|
|
|
protected function _force_login($nonce = '')
|
|
{
|
|
if ($this->config->item('rest_auth') == 'basic') {
|
|
header('WWW-Authenticate: Basic realm="' . $this->config->item('rest_realm') . '"');
|
|
} elseif ($this->config->item('rest_auth') == 'digest') {
|
|
header('WWW-Authenticate: Digest realm="' . $this->config->item('rest_realm') . '" qop="auth" nonce="' . $nonce . '" opaque="' . md5($this->config->item('rest_realm')) . '"');
|
|
}
|
|
|
|
$this->response(array('status' => false, 'error' => 'Not authorized'), 401);
|
|
}
|
|
|
|
// Force it into an array
|
|
protected function _force_loopable($data)
|
|
{
|
|
// Force it to be something useful
|
|
if (!is_array($data) and !is_object($data)) {
|
|
$data = (array) $data;
|
|
}
|
|
|
|
return $data;
|
|
}
|
|
|
|
// FORMATING FUNCTIONS ---------------------------------------------------------
|
|
|
|
// Many of these have been moved to the Format class for better separation, but these methods will be checked too
|
|
|
|
// Encode as JSONP
|
|
protected function _format_jsonp($data = array())
|
|
{
|
|
return $this->get('callback') . '(' . json_encode($data) . ')';
|
|
}
|
|
}
|