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gump.class.php
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<?php
/**
* GUMP - A fast, extensible PHP input validation class.
*
* @author Sean Nieuwoudt (http://twitter.com/SeanNieuwoudt)
* @author Filis Futsarov (http://twitter.com/FilisCode)
* @copyright Copyright (c) 2017 wixelhq.com
*
* @version 1.5
*/
class GUMP
{
// Singleton instance of GUMP
protected static $instance = null;
// Validation rules for execution
protected $validation_rules = array();
// Filter rules for execution
protected $filter_rules = array();
// Instance attribute containing errors from last run
protected $errors = array();
// Contain readable field names that have been set manually
protected static $fields = array();
// Custom validation methods
protected static $validation_methods = array();
// Custom validation methods error messages and custom ones
protected static $validation_methods_errors = array();
// Customer filter methods
protected static $filter_methods = array();
// ** ------------------------- Instance Helper ---------------------------- ** //
/**
* Function to create and return previously created instance
*
* @return GUMP
*/
public static function get_instance(){
if(self::$instance === null)
{
self::$instance = new static();
}
return self::$instance;
}
// ** ------------------------- Validation Data ------------------------------- ** //
public static $basic_tags = '<br><p><a><strong><b><i><em><img><blockquote><code><dd><dl><hr><h1><h2><h3><h4><h5><h6><label><ul><li><span><sub><sup>';
public static $en_noise_words = "about,after,all,also,an,and,another,any,are,as,at,be,because,been,before,
being,between,both,but,by,came,can,come,could,did,do,each,for,from,get,
got,has,had,he,have,her,here,him,himself,his,how,if,in,into,is,it,its,it's,like,
make,many,me,might,more,most,much,must,my,never,now,of,on,only,or,other,
our,out,over,said,same,see,should,since,some,still,such,take,than,that,
the,their,them,then,there,these,they,this,those,through,to,too,under,up,
very,was,way,we,well,were,what,where,which,while,who,with,would,you,your,a,
b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,$,1,2,3,4,5,6,7,8,9,0,_";
// field characters below will be replaced with a space.
protected $fieldCharsToRemove = array('_', '-');
protected $lang;
// ** ------------------------- Validation Helpers ---------------------------- ** //
public function __construct($lang = 'en')
{
if ($lang) {
$lang_file = __DIR__.DIRECTORY_SEPARATOR.'lang'.DIRECTORY_SEPARATOR.$lang.'.php';
if (file_exists($lang_file)) {
$this->lang = $lang;
} else {
throw new \Exception('Language with key "'.$lang.'" does not exist');
}
}
}
/**
* Shorthand method for inline validation.
*
* @param array $data The data to be validated
* @param array $validators The GUMP validators
*
* @return mixed True(boolean) or the array of error messages
*/
public static function is_valid(array $data, array $validators)
{
$gump = self::get_instance();
$gump->validation_rules($validators);
if ($gump->run($data) === false) {
return $gump->get_readable_errors(false);
} else {
return true;
}
}
/**
* Shorthand method for running only the data filters.
*
* @param array $data
* @param array $filters
*
* @return mixed
*/
public static function filter_input(array $data, array $filters)
{
$gump = self::get_instance();
return $gump->filter($data, $filters);
}
/**
* Magic method to generate the validation error messages.
*
* @return string
*/
public function __toString()
{
return $this->get_readable_errors(true);
}
/**
* Perform XSS clean to prevent cross site scripting.
*
* @static
*
* @param array $data
*
* @return array
*/
public static function xss_clean(array $data)
{
foreach ($data as $k => $v) {
$data[$k] = filter_var($v, FILTER_SANITIZE_STRING);
}
return $data;
}
/**
* Adds a custom validation rule using a callback function.
*
* @param string $rule
* @param callable $callback
* @param string $error_message
*
* @return bool
*
* @throws Exception
*/
public static function add_validator($rule, $callback, $error_message = null)
{
$method = 'validate_'.$rule;
if (method_exists(__CLASS__, $method) || isset(self::$validation_methods[$rule])) {
throw new Exception("Validator rule '$rule' already exists.");
}
self::$validation_methods[$rule] = $callback;
if ($error_message) {
self::$validation_methods_errors[$rule] = $error_message;
}
return true;
}
/**
* Adds a custom filter using a callback function.
*
* @param string $rule
* @param callable $callback
*
* @return bool
*
* @throws Exception
*/
public static function add_filter($rule, $callback)
{
$method = 'filter_'.$rule;
if (method_exists(__CLASS__, $method) || isset(self::$filter_methods[$rule])) {
throw new Exception("Filter rule '$rule' already exists.");
}
self::$filter_methods[$rule] = $callback;
return true;
}
/**
* Helper method to extract an element from an array safely
*
* @param mixed $key
* @param array $array
* @param mixed $default
* @return mixed
*/
public static function field($key, array $array, $default = null)
{
if(!is_array($array)) {
return null;
}
if(isset($array[$key])) {
return $array[$key];
} else {
return $default;
}
}
/**
* Getter/Setter for the validation rules.
*
* @param array $rules
*
* @return array
*/
public function validation_rules(array $rules = array())
{
if (empty($rules)) {
return $this->validation_rules;
}
$this->validation_rules = $rules;
}
/**
* Getter/Setter for the filter rules.
*
* @param array $rules
*
* @return array
*/
public function filter_rules(array $rules = array())
{
if (empty($rules)) {
return $this->filter_rules;
}
$this->filter_rules = $rules;
}
/**
* Run the filtering and validation after each other.
*
* @param array $data
* @param bool $check_fields
*
* @return array
*
* @throws Exception
*/
public function run(array $data, $check_fields = false)
{
$data = $this->filter($data, $this->filter_rules());
$validated = $this->validate(
$data, $this->validation_rules()
);
if ($check_fields === true) {
$this->check_fields($data);
}
if ($validated !== true) {
return false;
}
return $data;
}
/**
* Ensure that the field counts match the validation rule counts.
*
* @param array $data
*/
private function check_fields(array $data)
{
$ruleset = $this->validation_rules();
$mismatch = array_diff_key($data, $ruleset);
$fields = array_keys($mismatch);
foreach ($fields as $field) {
$this->errors[] = array(
'field' => $field,
'value' => $data[$field],
'rule' => 'mismatch',
'param' => null,
);
}
}
/**
* Sanitize the input data.
*
* @param array $input
* @param null $fields
* @param bool $utf8_encode
*
* @return array
*/
public function sanitize(array $input, array $fields = array(), $utf8_encode = true)
{
$magic_quotes = (bool) get_magic_quotes_gpc();
if (empty($fields)) {
$fields = array_keys($input);
}
$return = array();
foreach ($fields as $field) {
if (!isset($input[$field])) {
continue;
} else {
$value = $input[$field];
if (is_array($value)) {
$value = $this->sanitize($value);
}
if (is_string($value)) {
if ($magic_quotes === true) {
$value = stripslashes($value);
}
if (strpos($value, "\r") !== false) {
$value = trim($value);
}
if (function_exists('iconv') && function_exists('mb_detect_encoding') && $utf8_encode) {
$current_encoding = mb_detect_encoding($value);
if ($current_encoding != 'UTF-8' && $current_encoding != 'UTF-16') {
$value = iconv($current_encoding, 'UTF-8', $value);
}
}
$value = filter_var($value, FILTER_SANITIZE_STRING);
}
$return[$field] = $value;
}
}
return $return;
}
/**
* Return the error array from the last validation run.
*
* @return array
*/
public function errors()
{
return $this->errors;
}
/**
* Perform data validation against the provided ruleset.
*
* @param mixed $input
* @param array $ruleset
*
* @return mixed
*
* @throws Exception
*/
public function validate(array $input, array $ruleset)
{
$this->errors = array();
foreach ($ruleset as $field => $rules) {
$rules = explode('|', $rules);
$look_for = array('required_file', 'required');
if (count(array_intersect($look_for, $rules)) > 0 || (isset($input[$field]))) {
if (isset($input[$field])) {
if (is_array($input[$field]) && in_array('required_file', $ruleset)) {
$input_array = $input[$field];
} else {
$input_array = array($input[$field]);
}
} else {
$input_array = array('');
}
foreach ($input_array as $value) {
$input[$field] = $value;
foreach ($rules as $rule) {
$method = null;
$param = null;
// Check if we have rule parameters
if (strstr($rule, ',') !== false) {
$rule = explode(',', $rule);
$method = 'validate_'.$rule[0];
$param = $rule[1];
$rule = $rule[0];
// If there is a reference to a field
if (preg_match('/(?:(?:^|;)_([a-z_]+))/', $param, $matches)) {
// If provided parameter is a field
if (isset($input[$matches[1]])) {
$param = str_replace('_'.$matches[1], $input[$matches[1]], $param);
}
}
} else {
$method = 'validate_'.$rule;
}
//self::$validation_methods[$rule] = $callback;
if (is_callable(array($this, $method))) {
$result = $this->$method(
$field, $input, $param
);
if (is_array($result)) {
if (array_search($result['field'], array_column($this->errors, 'field')) === false) {
$this->errors[] = $result;
}
}
} elseif(isset(self::$validation_methods[$rule])) {
$result = call_user_func(self::$validation_methods[$rule], $field, $input, $param);
if($result === false) {
if (array_search($result['field'], array_column($this->errors, 'field')) === false) {
$this->errors[] = array(
'field' => $field,
'value' => $input[$field],
'rule' => $rule,
'param' => $param,
);
}
}
} else {
throw new Exception("Validator method '$method' does not exist.");
}
}
}
}
}
return (count($this->errors) > 0) ? $this->errors : true;
}
/**
* Set a readable name for a specified field names.
*
* @param string $field
* @param string $readable_name
*/
public static function set_field_name($field, $readable_name)
{
self::$fields[$field] = $readable_name;
}
/**
* Set readable name for specified fields in an array.
*
* Usage:
*
* GUMP::set_field_names(array(
* "name" => "My Lovely Name",
* "username" => "My Beloved Username",
* ));
*
* @param array $array
*/
public static function set_field_names(array $array)
{
foreach ($array as $field => $readable_name) {
self::set_field_name($field, $readable_name);
}
}
/**
* Set a custom error message for a validation rule.
*
* @param string $rule
* @param string $message
*/
public static function set_error_message($rule, $message)
{
$gump = self::get_instance();
self::$validation_methods_errors[$rule] = $message;
}
/**
* Set custom error messages for validation rules in an array.
*
* Usage:
*
* GUMP::set_error_messages(array(
* "validate_required" => "{field} is required",
* "validate_valid_email" => "{field} must be a valid email",
* ));
*
* @param array $array
*/
public static function set_error_messages(array $array)
{
foreach ($array as $rule => $message) {
self::set_error_message($rule, $message);
}
}
/**
* Get error messages.
*
* @return array
*/
protected function get_messages()
{
$lang_file = __DIR__.DIRECTORY_SEPARATOR.'lang'.DIRECTORY_SEPARATOR.$this->lang.'.php';
$messages = require $lang_file;
if ($validation_methods_errors = self::$validation_methods_errors) {
$messages = array_merge($messages, $validation_methods_errors);
}
return $messages;
}
/**
* Process the validation errors and return human readable error messages.
*
* @param bool $convert_to_string = false
* @param string $field_class
* @param string $error_class
*
* @return array
* @return string
*/
public function get_readable_errors($convert_to_string = false, $field_class = 'gump-field', $error_class = 'gump-error-message')
{
if (empty($this->errors)) {
return ($convert_to_string) ? null : array();
}
$resp = array();
// Error messages
$messages = $this->get_messages();
foreach ($this->errors as $e) {
$field = ucwords(str_replace($this->fieldCharsToRemove, chr(32), $e['field']));
$param = $e['param'];
// Let's fetch explicitly if the field names exist
if (array_key_exists($e['field'], self::$fields)) {
$field = self::$fields[$e['field']];
// If param is a field (i.e. equalsfield validator)
if (array_key_exists($param, self::$fields)) {
$param = self::$fields[$e['param']];
}
}
// Messages
if (isset($messages[$e['rule']])) {
if (is_array($param)) {
$param = implode(', ', $param);
}
$message = str_replace('{param}', $param, str_replace('{field}', '<span class="'.$field_class.'">'.$field.'</span>', $messages[$e['rule']]));
$resp[] = $message;
} else {
throw new \Exception ('Rule "'.$e['rule'].'" does not have an error message');
}
}
if (!$convert_to_string) {
return $resp;
} else {
$buffer = '';
foreach ($resp as $s) {
$buffer .= "<span class=\"$error_class\">$s</span>";
}
return $buffer;
}
}
/**
* Process the validation errors and return an array of errors with field names as keys.
*
* @param $convert_to_string
*
* @return array | null (if empty)
*/
public function get_errors_array($convert_to_string = null)
{
if (empty($this->errors)) {
return ($convert_to_string) ? null : array();
}
$resp = array();
// Error messages
$messages = $this->get_messages();
foreach ($this->errors as $e)
{
$field = ucwords(str_replace(array('_', '-'), chr(32), $e['field']));
$param = $e['param'];
// Let's fetch explicitly if the field names exist
if (array_key_exists($e['field'], self::$fields)) {
$field = self::$fields[$e['field']];
// If param is a field (i.e. equalsfield validator)
if (array_key_exists($param, self::$fields)) {
$param = self::$fields[$e['param']];
}
}
// Messages
if (isset($messages[$e['rule']])) {
// Show first validation error and don't allow to be overwritten
if (!isset($resp[$e['field']])) {
if (is_array($param)) {
$param = implode(', ', $param);
}
$message = str_replace('{param}', $param, str_replace('{field}', $field, $messages[$e['rule']]));
$resp[$e['field']] = $message;
}
} else {
throw new \Exception ('Rule "'.$e['rule'].'" does not have an error message');
}
}
return $resp;
}
/**
* Filter the input data according to the specified filter set.
*
* @param mixed $input
* @param array $filterset
*
* @throws Exception
*
* @return mixed
*
* @throws Exception
*/
public function filter(array $input, array $filterset)
{
foreach ($filterset as $field => $filters) {
if (!array_key_exists($field, $input)) {
continue;
}
$filters = explode('|', $filters);
foreach ($filters as $filter) {
$params = null;
if (strstr($filter, ',') !== false) {
$filter = explode(',', $filter);
$params = array_slice($filter, 1, count($filter) - 1);
$filter = $filter[0];
}
if (is_array($input[$field])) {
$input_array = &$input[$field];
} else {
$input_array = array(&$input[$field]);
}
foreach ($input_array as &$value) {
if (is_callable(array($this, 'filter_'.$filter))) {
$method = 'filter_'.$filter;
$value = $this->$method($value, $params);
} elseif (function_exists($filter)) {
$value = $filter($value);
} elseif (isset(self::$filter_methods[$filter])) {
$value = call_user_func(self::$filter_methods[$filter], $value, $params);
} else {
throw new Exception("Filter method '$filter' does not exist.");
}
}
}
}
return $input;
}
// ** ------------------------- Filters --------------------------------------- ** //
/**
* Replace noise words in a string (http://tax.cchgroup.com/help/Avoiding_noise_words_in_your_search.htm).
*
* Usage: '<index>' => 'noise_words'
*
* @param string $value
* @param array $params
*
* @return string
*/
protected function filter_noise_words($value, $params = null)
{
$value = preg_replace('/\s\s+/u', chr(32), $value);
$value = " $value ";
$words = explode(',', self::$en_noise_words);
foreach ($words as $word) {
$word = trim($word);
$word = " $word "; // Normalize
if (stripos($value, $word) !== false) {
$value = str_ireplace($word, chr(32), $value);
}
}
return trim($value);
}
/**
* Remove all known punctuation from a string.
*
* Usage: '<index>' => 'rmpunctuataion'
*
* @param string $value
* @param array $params
*
* @return string
*/
protected function filter_rmpunctuation($value, $params = null)
{
return preg_replace("/(?![.=$'€%-])\p{P}/u", '', $value);
}
/**
* Sanitize the string by removing any script tags.
*
* Usage: '<index>' => 'sanitize_string'
*
* @param string $value
* @param array $params
*
* @return string
*/
protected function filter_sanitize_string($value, $params = null)
{
return filter_var($value, FILTER_SANITIZE_STRING);
}
/**
* Sanitize the string by urlencoding characters.
*
* Usage: '<index>' => 'urlencode'
*
* @param string $value
* @param array $params
*
* @return string
*/
protected function filter_urlencode($value, $params = null)
{
return filter_var($value, FILTER_SANITIZE_ENCODED);
}
/**
* Sanitize the string by converting HTML characters to their HTML entities.
*
* Usage: '<index>' => 'htmlencode'
*
* @param string $value
* @param array $params
*
* @return string
*/
protected function filter_htmlencode($value, $params = null)
{
return filter_var($value, FILTER_SANITIZE_SPECIAL_CHARS);
}
/**
* Sanitize the string by removing illegal characters from emails.
*
* Usage: '<index>' => 'sanitize_email'
*
* @param string $value
* @param array $params
*
* @return string
*/
protected function filter_sanitize_email($value, $params = null)
{
return filter_var($value, FILTER_SANITIZE_EMAIL);
}
/**
* Sanitize the string by removing illegal characters from numbers.
*
* @param string $value
* @param array $params
*
* @return string
*/
protected function filter_sanitize_numbers($value, $params = null)
{
return filter_var($value, FILTER_SANITIZE_NUMBER_INT);
}
/**
* Sanitize the string by removing illegal characters from float numbers.
*
* @param string $value
* @param array $params
*
* @return string
*/
protected function filter_sanitize_floats($value, $params = null)
{
return filter_var($value, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);
}
/**
* Filter out all HTML tags except the defined basic tags.
*
* @param string $value
* @param array $params
*
* @return string
*/
protected function filter_basic_tags($value, $params = null)
{
return strip_tags($value, self::$basic_tags);
}
/**
* Convert the provided numeric value to a whole number.
*
* @param string $value
* @param array $params
*
* @return string
*/
protected function filter_whole_number($value, $params = null)
{
return intval($value);
}
/**
* Convert MS Word special characters to web safe characters.
* [“, ”, ‘, ’, –, …] => [", ", ', ', -, ...]
*
* @param string $value
* @param array $params
*
* @return string
*/
protected function filter_ms_word_characters($value, $params = null)
{
$word_open_double = '“';
$word_close_double = '”';
$web_safe_double = '"';
$value = str_replace(array($word_open_double, $word_close_double), $web_safe_double, $value);
$word_open_single = '‘';
$word_close_single = '’';
$web_safe_single = "'";
$value = str_replace(array($word_open_single, $word_close_single), $web_safe_single, $value);
$word_em = '–';
$web_safe_em = '-';
$value = str_replace($word_em, $web_safe_em, $value);
$word_ellipsis = '…';
$web_safe_em = '...';
$value = str_replace($word_ellipsis, $web_safe_em, $value);
return $value;
}
// ** ------------------------- Validators ------------------------------------ ** //
/**
* Verify that a value is contained within the pre-defined value set.
*
* Usage: '<index>' => 'contains,value value value'
*
* @param string $field
* @param array $input
* @param null $param
*
* @return mixed
*/
protected function validate_contains($field, $input, $param = null)
{
if (!isset($input[$field])) {
return;
}
$param = trim(strtolower($param));
$value = trim(strtolower($input[$field]));
if (preg_match_all('#\'(.+?)\'#', $param, $matches, PREG_PATTERN_ORDER)) {
$param = $matches[1];
} else {
$param = explode(chr(32), $param);
}
if (in_array($value, $param)) { // valid, return nothing
return;
}
return array(
'field' => $field,
'value' => $value,
'rule' => __FUNCTION__,
'param' => $param,
);
}
/**
* Verify that a value is contained within the pre-defined value set.
* OUTPUT: will NOT show the list of values.
*
* Usage: '<index>' => 'contains_list,value;value;value'
*
* @param string $field
* @param array $input
*
* @return mixed
*/
protected function validate_contains_list($field, $input, $param = null)
{
if (!isset($input[$field]) || empty($input[$field])) {
return;
}
$param = trim(strtolower($param));
$value = trim(strtolower($input[$field]));
$param = explode(';', $param);
// consider: in_array(strtolower($value), array_map('strtolower', $param)
if (in_array($value, $param)) { // valid, return nothing
return;
} else {
return array(
'field' => $field,
'value' => $value,
'rule' => __FUNCTION__,
'param' => $param,
);
}
}
/**
* Verify that a value is NOT contained within the pre-defined value set.
* OUTPUT: will NOT show the list of values.
*
* Usage: '<index>' => 'doesnt_contain_list,value;value;value'
*
* @param string $field
* @param array $input
*
* @return mixed
*/
protected function validate_doesnt_contain_list($field, $input, $param = null)
{
if (!isset($input[$field]) || empty($input[$field])) {
return;
}
$param = trim(strtolower($param));