/**
* check permission validation using current system settings
*
* @param string $perms the permission boolean expression
*/
function perm_chck($perms = '')
{
$CI =& get_instance();
// if the user is admin then the result would be TRUE
if ($CI->ion_auth->is_admin()) {
return TRUE;
}
$perm_vars = perm_array();
$perms = str_replace(array_keys($perm_vars['boolVars']), array_values($perm_vars['boolVars']), $perms);
$vars_reg = implode('|', array_keys($perm_vars['vars']));
$matches = array();
// regular expression to ckeck is the permission string
// is in the wanted form or not .... i know it's a little missy
// it will extract the valid regex to matches array
preg_match("/(?:(?(3)\\s*\\b(and|or|not)\\b\\s+)(?:(not)\\s+)?({$vars_reg}|0|1)\\s*([<>]=?|!?=)\\s*(\\d+(?:\\.\\d*)?|\\.\\d+|'[^']*'))+/", $perms, $matches);
$matches = @$matches[0];
//no matches found (BAD OR EMPTY $perm)
if (empty($matches)) {
return FALSE;
}
// replace operators with valid operators like = with ==
$matches = str_replace(array_keys($perm_vars['opers']), array_values($perm_vars['opers']), $matches);
// replace variables with it's values
$matches = str_replace(array_keys($perm_vars['vars']), array_values($perm_vars['vars']), $matches);
// evaluate the expression to get a boolean value
$result = FALSE;
eval('$result= (' . $matches . ');');
return $result;
}
/**
* a permission field auto grow textarea
*/
function permission($NAME = '', $value = '', $attr = array())
{
add_dojo("dijit.form.Textarea");
$ci =& get_instance();
$ci->load->helper('perm');
$p_arr = perm_array();
$t_text = "<b>Boolean variables : </b>" . implode('|', array_keys($p_arr['boolVars'])) . "<br><b>Variables : </b>" . implode('|', array_keys($p_arr['vars']));
$value = form_prep($value);
$id_g = 'p' . microtime();
$attr = $this->attribute($attr, 'id', $id_g, FALSE);
$id_g = $attr['id'];
$text = $this->textarea($NAME, $value, $attr) . $this->tooltip($id_g, $t_text);
return $text;
}
/**
* create a permission textarea using dojo
* and add a tooltip with the variables/booleans/operators
* that could be used in the expression
*
* @param string $NAME field name
* @param string $value field current value
* @param array/object/string $attr attribute to be added to the field
* @return string HTML tag of the field
*/
public function permission($NAME = '', $value = '', $attr = array())
{
theme_add('dijit.form.Textarea');
$ci =& get_instance();
$ci->load->helper('perm');
$p_arr = perm_array();
$t_text = '<b>' . lang('system_boolean_vars') . ' : </b>' . implode('|', array_keys($p_arr['boolVars'])) . '<br><b>' . lang('system_vars') . ' : </b>' . implode('|', array_keys($p_arr['vars']));
$value = form_prep($value);
$id_g = 'p' . microtime();
$this->attribute($attr, 'id', $id_g, FALSE);
$id_g = $attr['id'];
$text = $this->textarea($NAME, $value, $attr) . $this->tooltip($id_g, $t_text);
return $text;
}
