feat: Add several missing functions and fix file_exists error

src/CI3Compatible/Core/CI_Input.php

@@ -18,6 +18,14 @@
 
 class CI_Input
 {
+
+    /**
+     * IP address of the current user
+     *
+     * @var	string
+     */
+    protected $ip_address = FALSE;
+
     /**
      * Fetch an item from the GET array
      *
@@ -62,6 +70,22 @@ private function checkXssClean(bool $xss_clean)
             );
         }
     }
+
+    /**
+     * Fetch an item from the COOKIE array
+     *
+     * @param	mixed	$index		Index for item to be fetched from $_COOKIE
+     * @param	bool	$xss_clean	Whether to apply XSS filtering
+     * @return	mixed
+     */
+    public function cookie($index = NULL, $xss_clean = false)
+    {
+        $this->checkXssClean($xss_clean);
+
+        $request = Services::request();
+
+        return $request->getCookie($index);
+    }
 
     /**
      * Fetch an item from the SERVER array
@@ -79,4 +103,179 @@ public function server($index = null, bool $xss_clean = false)
 
         return $request->getServer($index);
     }
+
+    /**
+     * Fetch the IP Address
+     *
+     * Determines and validates the visitor's IP address.
+     *
+     * @return	string	IP address
+     */
+    public function ip_address()
+    {
+        if ($this->ip_address !== FALSE)
+        {
+            return $this->ip_address;
+        }
+
+        $config = config('App');
+        $proxy_ips = $config->proxyIPs;
+        if ( ! empty($proxy_ips) && ! is_array($proxy_ips))
+        {
+            $proxy_ips = explode(',', str_replace(' ', '', $proxy_ips));
+        }
+
+        $this->ip_address = $this->server('REMOTE_ADDR');
+
+        if ($proxy_ips)
+        {
+            foreach (array('HTTP_X_FORWARDED_FOR', 'HTTP_CLIENT_IP', 'HTTP_X_CLIENT_IP', 'HTTP_X_CLUSTER_CLIENT_IP') as $header)
+            {
+                if (($spoof = $this->server($header)) !== NULL)
+                {
+                    // Some proxies typically list the whole chain of IP
+                    // addresses through which the client has reached us.
+                    // e.g. client_ip, proxy_ip1, proxy_ip2, etc.
+                    sscanf($spoof, '%[^,]', $spoof);
+
+                    if ( ! $this->valid_ip($spoof))
+                    {
+                        $spoof = NULL;
+                    }
+                    else
+                    {
+                        break;
+                    }
+                }
+            }
+
+            if ($spoof)
+            {
+                for ($i = 0, $c = count($proxy_ips); $i < $c; $i++)
+                {
+                    // Check if we have an IP address or a subnet
+                    if (strpos($proxy_ips[$i], '/') === FALSE)
+                    {
+                        // An IP address (and not a subnet) is specified.
+                        // We can compare right away.
+                        if ($proxy_ips[$i] === $this->ip_address)
+                        {
+                            $this->ip_address = $spoof;
+                            break;
+                        }
+
+                        continue;
+                    }
+
+                    // We have a subnet ... now the heavy lifting begins
+                    isset($separator) OR $separator = $this->valid_ip($this->ip_address, 'ipv6') ? ':' : '.';
+
+                    // If the proxy entry doesn't match the IP protocol - skip it
+                    if (strpos($proxy_ips[$i], $separator) === FALSE)
+                    {
+                        continue;
+                    }
+
+                    // Convert the REMOTE_ADDR IP address to binary, if needed
+                    if ( ! isset($ip, $sprintf))
+                    {
+                        if ($separator === ':')
+                        {
+                            // Make sure we're have the "full" IPv6 format
+                            $ip = explode(':',
+                                str_replace('::',
+                                    str_repeat(':', 9 - substr_count($this->ip_address, ':')),
+                                    $this->ip_address
+                                )
+                            );
+
+                            for ($j = 0; $j < 8; $j++)
+                            {
+                                $ip[$j] = intval($ip[$j], 16);
+                            }
+
+                            $sprintf = '%016b%016b%016b%016b%016b%016b%016b%016b';
+                        }
+                        else
+                        {
+                            $ip = explode('.', $this->ip_address);
+                            $sprintf = '%08b%08b%08b%08b';
+                        }
+
+                        $ip = vsprintf($sprintf, $ip);
+                    }
+
+                    // Split the netmask length off the network address
+                    sscanf($proxy_ips[$i], '%[^/]/%d', $netaddr, $masklen);
+
+                    // Again, an IPv6 address is most likely in a compressed form
+                    if ($separator === ':')
+                    {
+                        $netaddr = explode(':', str_replace('::', str_repeat(':', 9 - substr_count($netaddr, ':')), $netaddr));
+                        for ($j = 0; $j < 8; $j++)
+                        {
+                            $netaddr[$j] = intval($netaddr[$j], 16);
+                        }
+                    }
+                    else
+                    {
+                        $netaddr = explode('.', $netaddr);
+                    }
+
+                    // Convert to binary and finally compare
+                    if (strncmp($ip, vsprintf($sprintf, $netaddr), $masklen) === 0)
+                    {
+                        $this->ip_address = $spoof;
+                        break;
+                    }
+                }
+            }
+        }
+
+        if ( ! $this->valid_ip($this->ip_address))
+        {
+            return $this->ip_address = '0.0.0.0';
+        }
+
+        return $this->ip_address;
+    }
+
+    // --------------------------------------------------------------------
+
+    /**
+     * Validate IP Address
+     *
+     * @param	string	$ip	IP address
+     * @param	string	$which	IP protocol: 'ipv4' or 'ipv6'
+     * @return	bool
+     */
+    public function valid_ip($ip, $which = '')
+    {
+        switch (strtolower($which))
+        {
+            case 'ipv4':
+                $which = FILTER_FLAG_IPV4;
+                break;
+            case 'ipv6':
+                $which = FILTER_FLAG_IPV6;
+                break;
+            default:
+                $which = 0;
+                break;
+        }
+
+        return (bool) filter_var($ip, FILTER_VALIDATE_IP, $which);
+    }
+
+    // --------------------------------------------------------------------
+
+    /**
+     * Fetch User Agent string
+     *
+     * @return	string|null	User Agent string or NULL if it doesn't exist
+     */
+    public function user_agent($xss_clean = false)
+    {
+        return $this->server('HTTP_USER_AGENT', $xss_clean);
+    }
 }

src/CI3Compatible/Core/CI_Loader.php

@@ -169,7 +169,7 @@ protected function _ci_load(array $_ci_data)
         // Set the default data variables
         $_ci_view = $_ci_data['_ci_view'] ?? false;
         $_ci_vars = $_ci_data['_ci_vars'] ?? false;
-        $_ci_path = $_ci_data['_ci_path'] ?? false;
+        $_ci_path = $_ci_data['_ci_path'] ?? '';
         $_ci_return = $_ci_data['_ci_return'] ?? false;
 
         $file_exists = false;

src/CI3Compatible/Core/CI_URI.php

@@ -16,4 +16,9 @@
 class CI_URI
 {
     // @TODO
+
+    public function segment($segmentId, $no_result = ''){
+        $uri = service('uri');
+        return $uri->getSegment($segmentId, $no_result);
+    }
 }