<?php
/**
* api: php
* title: Input $_REQUEST wrappers
* type: interface
* description: Encapsulates input variable superglobals for easy sanitization access
* version: 2.8
* revision: $Id$
* license: Public Domain
* depends: php:filter, php >5.0, html_purifier
* config: <const name="INPUT_DIRECT" type="multi" value="disallow" multi="disallow|raw|log" description="filter method for direct $_REQUEST[var] access" />
* <const name="INPUT_QUIET" type="bool" value="0" multi="0=report all|1=no notices|2=no warnings" description="suppress access and behaviour notices" />
* throws: E_USER_NOTICE, E_USER_WARNING, OutOfBoundsException
*
* Using these object wrappers ensures a single entry point and verification
* spot for all user data. They wrap all superglobals and filter HTTP input
* through sanitizing methods. For auditing casual and unverified access.
*
* Standardly they wrap: $_REQUEST, $_GET, $_POST, $_SERVER, $_COOKIE
* And provide convenient access to filtered data:
* $_GET->int("page_num") // method
* $_POST->text["commentfield"] // array syntax
* $_REQUEST->text->ascii->strtolower["xyz"] // filter chains
*
* Available filter methods are:
* ->int
* ->float
* ->boolean
* ->name
* ->id
* ->words
* ->text
* ->ascii
* ->nocontrol
* ->spaces
* ->q
* ->escape
* ->regex
* ->in_array
* ->html
* ->purify
* ->json
* ->length
* ->range
* ->default
* And most useful methods of the php filter extension.
* ->email
* ->url ->uri ->http
* ->ip
* ->ipv4->public
* PHP string modification functions:
* ->urlencode
* ->strip_tags
* ->htmlentities
* ->strtolower
* Automatic filter chain handler:
* ->array
* Fetch multiple variables at once:
* ->list["var1,key,name"]
* Process multiple entries as array:
* ->multi->http_build_query["id,token"]
* Possible but should be used very consciously:
* ->xss
* ->sql
* ->mysql
* ->log
* ->raw
*
* You can also pre-define a standard filter-chain for all following calls:
* $_GET->nocontrol->iconv->utf7->xss->always();
*
* Using $__rules[] a set of filter rules can be preset per variable name.
*
* Parameterized filters can alternatively use the ellipsis … symbol (AltGr+:)
* instead of the terminating method access syntax.
* $_GET->int->range…0…59["minutes"]
*
* Some filters are a mixture of sanitizing and validation. Basically
* all can also be used independently of the superglobals with their
* underscore name, $str = input::_text($str);
*
* For the superglobals it's also possible to count($_GET); or check with
* just $_POST() if there are contents. (Use this in lieu of empty() test.)
* There are also the three functions ->has ->no ->keys() for array lookup.
*
* Defining new filters can be done as methods, or since those are picked
* up too, as plain global functions. It's also possible to assign function
* aliases or attach closures:
* $_POST->_newfilter = function($s) { return modified($s); }
* Note that the assigned filter name must have an underscore prefixed.
*
* --
*
* Input validation of course is no substitute for secure application logic,
* parameterized sql and proper output encoding. But this methodology is a
* good base and streamlines input data handling.
*
* Filter methods can be bypassed in any number of ways. There's no effort
* made at prevention here. But it's recommended to simply use ->raw() when
* needed - not all input can be filtered anyway. This way an audit handler
* could always attach there - when desired.
*
* The goal is not to coerce, but encourage security via API *simplicity*.
*
*/
/**
* Project-specific identifiers.
*
* Since `input` is an overly generic name, one might wish to wrap it up if
* there's an identifier conflict. (Remember; namespaces aren't taxonomies.)
*
*/
#namespace filter;
#use \ArrayObject, \Countable, \Iterator, \OutOfBoundsException;
#use \HTMLPurifier;
/**
* Handler name for direct $_REQUEST["array"] access.
*
* "raw" = reports with warning,
* "disallow" = throws an exception
*/
defined("INPUT_DIRECT") or
define("INPUT_DIRECT", "raw");
/**
* Notice suppression.
*
* 0 = report all,
* 1 = no notices,
* 2 = ignore non-existant filter
*/
defined("INPUT_QUIET") or
define("INPUT_QUIET", 0);
/**
* @class Request variable input wrapper.
*
* The methods are defined with underscore prefix, but supposed to be used without
* when invoked on the superglobal arrays:
*
* @method int int[$field] converts input into integer
* @method float float[$field]
* @method name name[$field] removes any non-alphanumeric characters
* @method id id[$field] alphanumeric string with dots
* @method text text[$field] textual data with interpunction
*
*/
class input implements ArrayAccess, Countable, Iterator {
/**
* Data filtering functions.
*
* These methods are usually not to be called directly. Instead use
* $_GET->filtername["varname"] syntax without preceeding underscore
* to access variable content.
*
* Categories: [e]=escape, [w]=whitelist, [b]=blacklist, [s]=sanitize, [v]=validate
*
*/
/**
* @type cast
* @sample 22
*
* Integer.
*
*/
function _int($data) {
return (int)$data;
}
/**
* @type cast
* @sample 3.14159
*
* Float.
*
*/
function _float($data) {
return (float)$data;
}
/**
* @type white, strip
* @sample "_foo123"
*
* Alphanumeric strings.
* (e.g. var names, letters and numbers, may contain international letters)
*
*/
function _name($data) {
return preg_replace("/\W+/u", "", $data);
}
/**
* @type white, strip
* @sample "xvar.1_2.x"
*
* Identifiers with underscores and dots,
*
*/
function _id($data) {
return preg_replace("#(^[^a-z_]+)|[^\w\d_.]+|([^\w_]$)#i", "", $data);
}
/**
* @type white, strip
* @sample "tag-name-123"
*
* Alphanumeric strings with dashes. Commonly used for slugs.
* Consecutive dashes and underscores are compacted.
*
*/
function _slug($data) {
return preg_replace("/[^\w-]+|^[^a-z]+|[^\w]+$|(?<=[-_])[-_]+/", "", strtolower($s));
}
/**
* @type white, strip
* @sample "Hello - World. Foo + 3, Bar."
*
* Flow text with whitespace,
* with minimal interpunction allowed (optional parameter).
*
*/
function _words($data, $extra="") {
return preg_replace("/[^\w\d\s,._\-+$extra]+/u", " ", strip_tags($data));
}
/**
* [w]
* Human-readable text with many special/interpunction characters:
* " and ' allowed, but no <, > or \
*
*/
function _text($data) {
return preg_replace("/[^\w\d\s,._\-+?!;:\"\'\/`‘´()*=#@]+/u", " ", strip_tags($data));
}
/**
* Acceptable filename characters.
*
* Alphanumerics and dot (but not as first character).
* You should use `->basename` as primary filter anyway.
*
* @t whitelist
*
*/
function _filename($data) {
return preg_replace("/^[.\s]|[^\w._+-]/", "_", $data);
}
/**
* [b]
* Filter non-ascii text out.
* Does not remove control characters. (Similar to FILTER_FLAG_STRIP_HIGH.)
*
*/
function _ascii($data) {
return preg_replace("/[\\200-\\377]+/", "", $data);
}
/**
* [b]
* Remove control characters. (Similar to FILTER_FLAG_STRIP_LOW.)
*
*/
function _nocontrol($data) {
return preg_replace("/[\\000-\\010\\013\\014\\016-\\037\\177\\377]+/", "", $data); // all except \r \n \t
}
/**
* [e]
* Exchange \r \n \t and \f \v \0 for normal spaces.
*
*/
function _spaces($data) {
return strtr($data, "\r\n\t\f\v\0", " ");
}
/**
* [e]
* Normalize all linebreaks to just \n
*
*/
function _nl($data) {
return preg_replace("/\R/", "\n", $data);
}
/**
* [x]
* Regular expression filter.
*
* This either extracts (preg_match) data if you have a () capture group,
* or functions as filter (pref_replace) if there's a [^ character class.
*
*/
function _regex($data, $rx="", $match=1) {
# validating
if (strpos($rx, "(")) {
if (preg_match($rx, $data, $result)) {
return($result[$match]);
}
}
# cropping
elseif (strpos($rx, "[^")) {
return preg_replace($rx, "", $data);
}
# replacing
else {
return preg_replace($rx, $match, $data);
}
}
/**
* [w]
* Miximum and minimum string length.
*
*/
function _length($data, $max=65535, $cut=NULL) {
// just the length limit
if (is_null($cut)) {
return substr($data, 0, $max);
}
// require minimum string length, else drop value completely
else {
return strlen($data) >= $max ? substr($data, 0, $cut) : NULL;
}
}
/**
* [w]
* Range ensures value is between given minimum and maximum.
* (Does not convert to integer itself.)
*
*/
function _range($data, $min, $max) {
return ($data > $max) ? $max : (($data < $min) ? $min : $data);
}
/**
* [b]
* Fallback value for absent/falsy values.
*
*/
function _default($data, $default) {
return empty($data) ? $default : $data;
}
/**
* [w]
* Boolean recognizes 1 or 0 and textual values like "false" and "off" or "no".
*
*/
function _boolean($data) {
if (empty($data) || $data==="0" || in_array(strtolower($data), array("false", "off", "no", "n", "wrong", "not", "-"))) {
return false;
}
elseif ($data==="1" || in_array(strtolower($data), array("true", "on", "yes", "right", "y", "ok"))) {
return true;
}
else return NULL;
}
/**
* [w]
* Ensures field is in array of allowed values.
*
* Works with arrays, but also string list. If you supply a "list,list,list" then
* the comparison is case-insensitive.
*
*/
function _in_array($data, $array) {
if (is_array($array) ? in_array($data, $array) : in_array(strtolower($data), explode(",", strtolower($array)))) {
return $data;
}
}
###### filter_var() wrappers #########
/**
* [w]
* Common case email syntax.
*
* (Close to RFC2822 but disallows square brackets or double quotes, no verification of TLDs,
* doesn't restrict underscores in domain names, ignores i@an and anyone@localhost.)
*
*/
function _email($data, $validate=1) {
$data = preg_replace("/[^\w!#$%&'*+/=?_`{|}~@.\[\]\-]/", "", $data); // like filter_var
if (!$validate || preg_match("/^(?!\.)[.\w!#$%&'*+/=?^_`{|}~-]+@(?:(?!-)[\w-]{2,}\.)+[\w]{2,6}$/i", trim($data))) {
return $data;
}
}
/**
* [s]
* URI characters. (Actually IRI)
*
*/
function _uri($data) {
# we should encode all-non chars
return preg_replace("/[^-\w\d\$.+!*'(),{}\|\\~\^\[\]\`<>#%\";\/?:@&=]+/u", "", $data); // same as SANITIZE_URL
}
/**
* [w]
* URL syntax
*
* This is an alias for FILTER_VALIDATE_URL. Beware that it lets a few unwanted schemes
* through (file:// and mailto:) and what you'd consider misformed URLs (http://http://whatever).
*
*/
function _url($data) {
return filter_var($data, FILTER_VALIDATE_URL);
}
/**
* [v]
* More restrictive HTTP/FTP url syntax.
* No usernames allowed, no empty port, pathnames/qs/anchor are not checked.
*
# see also http://internet.ls-la.net/folklore/url-regexpr.html
*/
function _http($data) {
return preg_match("~
(?(DEFINE) (?<byte> 2[0-4]\d |25[0-5] |1\d\d |[1-9]?\d) (?<ip>(?&byte)(\.(?&byte)){3}) (?<hex>[0-9a-fA-F]{1,4}) )
^ (?<proto>https?|ftps?) ://
# (?<user> \w+(:\w+)?@ )?
( (?<host> (?:[a-z\d][a-z\d_\-\$]*\.?)+)
|(?<ipv6> \[ (?! [:\w]*::: # ASSERT: no triple ::: colons
|(:\w+){8}|(\w+:){8} # not more than 7 : colons
|(\w*:){7}\w+\. # not more than 6 : if there's a .
| [:\w]*::[:\w]+:: ) # double :: colon must be unique
(?= [:\w]*:: # don't count if there is one ::
|(\w+:){6}\w+[:.]) # else require six : and one . or :
(?: :|(?&hex):)+((?&hex)|(?&ip)|:) \]) # MATCH: combinations of HEX : IP
|(?<ipv4> (?&ip) ) )
(?<port> :\d{1,5} )? # the integer isn't optional if port : colon present (unlike FILTER_VALIDATE_URL)
(?<path> [/][^?#\s]* )?
(?<qury> [?][^#\s]* )?
(?<frgm> [#]\S* )?
\z~ix", $data, $uu) ? $data : NULL;#(print_r($uu) ? $data : $data)
}
/**
* [w]
* IP address
*
*/
function _ip($data) {
return filter_var($data, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4|FILTER_FLAG_IPV6) ? $data : NULL;
}
/**
* [w]
* IPv4 address
*
*/
function _ipv4($data) {
return filter_var($data, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) ? $data : NULL;
}
/**
* [w]
* must be public IP address
*
*/
function _public($data) {
return filter_var($data, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE|FILTER_FLAG_NO_RES_RANGE) ? $data : NULL;
}
###### format / representation #########
/**
* [v]
* HTML5 datetime / datetime_local, date, time
*
*/
function _datetime($data) {
return preg_match("/^\d{0}\d\d\d\d -(0\d|1[012]) -([012]\d|3[01]) T ([01]\d|2[0-3]) :[0-5]\d :[0-5]\d (Z|[+-]\d\d:\d\d|\.\d\d)$/x", $data) ? $data : NULL;
}
function _date($data) {
return preg_match("/^\d\d\d\d -(0\d|1[012]) -([012]\d|3[01])$/x", $data) ? $data : NULL;
}
function _time($data) {
return preg_match("/^([01]\d|2[0-3]) :[0-5]\d :[0-5]\d (\.\d\d)?$/x", $data) ? $data : NULL;
}
/**
* [v]
* HTML5 color
*
*/
function _color($data) {
return preg_match("/^#[0-9A-F]{6}$/i", $data) ? strtoupper($data) : NULL;
}
/**
* [w]
* Telephone numbers (HTML5 <input type=tel> makes no constraints.)
*
*/
function _tel($data) {
$data = preg_replace("#[/.\s]+#", "-", $data);
if (preg_match("/^(\+|00)?(-?\d{2,}|\(\d+\)){2,}(-\d{2,}){,3}(\#\d+)?$/", $data)) {
return trim($data, "-");
}
}
/**
* [v]
* Verify minimum consistency (RFC4627 regex) and decode json data.
*
*/
function _json($data) {
if (!preg_match('/[^,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/', preg_replace('/"(\\.|[^"\\])*"/g', '', $data))) {
return json_decode($data);
}
}
/**
* [v]
* XML tree.
*
*/
function _xml($data) {
return simplexml_load_string($data);
}
/**
* [w]
* Clean html string via HTMLPurifier.
*
*/
function _purify($data) {
$h = new HTMLPurifier;
return $h->purify( $data );
}
/**
* [e]
* HTML escapes.
*
* This is actually an output filter. But might be useful to mirror input back into
* form fields instantly `<input name=field value="<?= $_GET->html["field"] ?>">`
*
* @param $data string
* @return string
*/
function _html($data) {
return htmlspecialchars($data, ENT_QUOTES, "UTF-8", false);
}
/**
* [b]
* Removes residual and certain HTML tags.
* WARNING: This is no `strip_tags()` substitute, but purposefully leaves
* lonesome < angle brackets > alone. Only strips coherent and well-known
* presentational markup.
*
*/
function _strip_markup($data, $with="") {
return preg_replace("~(<\s*/?\s*(a|b|i|em|strong|sup|sub|ins|del|br|hr|big|small|font|span|p|div|table|tr|td|ol|ul|li|dl|dd|dt|abbr|tt|code|pre|h[1-6])\b".
"(?>[^>\"\']+|\"[^\"]*\"|'[^']*')*>)+~", $with, $data);
}
/**
* [e]
* Escape all significant special chars.
*
*/
function _escape($data) {
return preg_replace("/[\\\\\[\]\{\}\[\]\'\"\`\´\$\!\&\?\/\>\<\|\*\~\;\^]/", "\\$1", $data);
}
/**
* [e]
* Addslashes
*
*/
function _q($data) {
return addslashes($data);
}
/**
* [b]
* Minimal XSS detection.
* Attempts no cleaning, just bails if anything looks suspicious.
*
* If something is XSS contaminated, it's spam and not worth to process further.
* WEAK filters are better than no filters, but you should ultimatively use ->html purifier instead.
*
*/
function _xss($data) {
if (preg_match("/[<&>]/", $data)) { // looks remotely like html
$html = $data;
// remove filler
$html = preg_replace("/&#(\d);*/e", "ord('$1')", $html); // escapes
$html = preg_replace("/&#x(\w);*/e", "ord(dechex('$1'))", $html); // escapes
$html = preg_replace("/[\x00-\x20\"\'\`\´]/", "", $html); // whitespace + control characters, also any quotes
$html .= preg_replace("#/\*[^<>]*\*/#", "", $html); // in-JS obfuscation comments
// alert patterns
if (preg_match("#[<<]/*(\?import|applet|embed|object|script|style|!\[CDATA\[|title|body|link|meta|base|i?frame|frameset|i?layer)#iUu", $html, $uu)
or preg_match("#[<>]\w[^>]*(\w{3,}[=:]+(javascript|ecmascript|vbscript|jscript|python|actionscript|livescript):)#iUu", $html, $uu)
or preg_match("#[<>]\w[^>]*(on(mouse\w+|key\w+|focus\w*|blur|click|dblclick|reset|select|change|submit|load|unload|error|abort|drag|Abort|Activate|AfterPrint|AfterUpdate|BeforeActivate|BeforeCopy|BeforeCut|BeforeDeactivate|BeforeEditFocus|BeforePaste|BeforePrint|BeforeUnload|Begin|Blur|Bounce|CellChange|Change|Click|ContextMenu|ControlSelect|Copy|Cut|DataAvailable|DataSetChanged|DataSetComplete|DblClick|Deactivate|Drag|DragEnd|DragLeave|DragEnter|DragOver|DragDrop|Drop|End|Error|ErrorUpdate|FilterChange|Finish|Focus|FocusIn|FocusOut|Help|KeyDown|KeyPress|KeyUp|LayoutComplete|Load|LoseCapture|MediaComplete|MediaError|MouseDown|MouseEnter|MouseLeave|MouseMove|MouseOut|MouseOver|MouseUp|MouseWheel|Move|MoveEnd|MoveStart|OutOfSync|Paste|Pause|Progress|PropertyChange|ReadyStateChange|Repeat|Reset|Resize|ResizeEnd|ResizeStart|Resume|Reverse|RowsEnter|RowExit|RowDelete|RowInserted|Scroll|Seek|Select|SelectionChange|SelectStart|Start|Stop|SyncRestored|Submit|TimeError|TrackChange|Unload|URLFlip)[^<\w=>]*[=:]+)[^<>]{3,}#iUu", $html, $uu)
or preg_match("#[<>]\w[^>]*(\w{3,}[=:]+(-moz-binding:))#iUu", $html, $uu)
or preg_match("#[<>]\w[^>]*(style[=:]+[^<>]*(expression\(|behaviour:|script:))#iUu", $html, $uu))
{
$this->_log($data, "DETECTED XSS PATTERN ({$uu['1']}),");
$data = "";
die("input::_xss");
}
}
return $data;
}
/**
* [w]
* Cleans utf-8 from invalid sequences and alternative representations.
* (BEWARE: performance drain)
*
*/
function _iconv($data) {
return iconv("UTF-8", "UTF-8//IGNORE", $data);
}
/**
* [b]
* Few dangerous UTF-7 sequences
* (only necessary if output pages don't have a charset specified)
*
*/
function _utf7($data) {
return preg_replace("/[+]A(D[w40]|C[IYQU])(-|$)?/", "", $data);;
}
/**
* [e]
* Escape for concatenating data into sql query.
* (suboptimal, use parameterized queries instead)
*
*/
function _sql($data) {
INPUT_QUIET or trigger_error("SQL escaping of input variable '$this->__varname'.", E_USER_NOTICE);
return db()->quote($data); // global object
}
function _mysql($data) {
INPUT_QUIET or trigger_error("SQL escaping of input variable '$this->__varname'.", E_USER_NOTICE);
return mysql_real_escape_string($data);
}
###### pseudo filters ##############
/**
* [x]
* Unfiltered access should obviously be avoided. But it's not always possible,
* so this method exists and will just trigger a notice in debug mode.
*
*/
function _raw($data) {
INPUT_QUIET or trigger_error("Unfiltered input variable \${$this->__title}['{$this->__varname}'] accessed.", E_USER_NOTICE);
return $data;
}
/**
* [x]
* Unfiltered access, but logs variable name and value.
*
*/
function _log($data, $reason="manual log") {
syslog(LOG_NOTICE, "php7://input:_log@{$_SERVER['SERVER_NAME']} accessing \${$this->__title}['{$this->__varname}'] variable, $reason, content=" . substr($this->_id(json_encode($data)), 0, 48));
return $data;
}
/**
* [b]
* Abort with fatal error. (Used as fallback for INPUT_DIRECT access.)
*
*/
function _disallow($data) {
throw new OutOfBoundsException("Direct \$_REQUEST[\"$this->__varname\"] is not allowed, add ->filter method, or change INPUT_DIRECT if needed.");
}
/**
* Validate instead of sanitize.
*
*/
function _is($data) {
$this->__filter[] = array("is_still", array());
return $data;
}
function _is_still($data) {
return $data === $this->__vars[$this->__varname];
}
###### implementation ################################################
/**
* Array data from previous superglobal.
*
* (It's pointless to make this a priv/proteced attribute, as raw data could be accessed
* in any number of ways. Not the least would be to just not use the input filters.)
*
*/
var $__vars = array();
/**
* Name of superarray this filter object wraps.
* (e.g. "_GET" or "_SERVER")
*
*/
var $__title = "";
/**
* Currently accessed array key.
*
*/
var $__varname = "";
/**
* Amassed filter list.
* Each ->method->chain name will be appended here. Gets automatically reset after
* a succesful variable access.
*
* Each entry is in `array("methodname", array("param1", 2, 3))` format.
*
*/
var $__filter = array(); // filterchain method stack
/**
* Automatically appended filter list. (Simply combined with current `$__filter`s).
*
*/
var $__always = array();
/**
* Currently accessed array keys.
*
*/
var $__rules = array( // pre-defined varname filters
// "varname.." => array( array("length",array(256), array("nocontrol",array()) ),
);
/**
* Initialize object from
*
* @param array one of $_REQUEST, $_GET or $_POST etc.
*/
function __construct($_INPUT, $title="") {
$this->__vars = $_INPUT; // stripslashes on magic_quotes_gpc might go here, but we have no word if we actually receive a superglobal or if it wasn't already corrected
$this->__title = $title;
}
/**
* Sets default filter chain.
* These are ALWAYS applied in CONJUNCTION to ->manually->specified->filters.
*
*/
function always() {
$this->__always = $this->__filter;
$this->__filter = array();
}
/**
* Normalize array keys (to UPPER case), for e.g. $_SERVER vars.
*
*/
function key_case($case=CASE_UPPER) {
$this->__vars = array_change_key_case($this->__vars, $case);
}
/**
* Executes current filter or filter chain on given $varname.
*
*/
function filter($varname, $reset_filter_afterwards=NULL) {
// single array [["name"]] becomes varname
if (is_array($varname) and count($varname)===1) {
$varname = current($varname);
}
$this->__varname = $varname;
// direct/raw access without any ->filtername prior offsetGet[] or plain filter() call
if (empty($this->__filter)) {
if (isset($this->__rules[$varname])) {
$this->__filter = $this->rules[$varname]; // use a predefined filterset
} else {
$this->__filter = array( INPUT_DIRECT ); // direct access handler
}
}
$first_handler = reset($this->__filter);
// retrieve value for selected input variable
$data = NULL;
if (!is_scalar($varname) or $first_handler == "list" or $first_handler == "multi") {
// one of the multiplex handlers supposedly picks it up
}
elseif (isset($this->__vars[$varname])) {
// entry exists
$data = $this->__vars[$varname];
}
elseif (!INPUT_QUIET) {
trigger_error("Undefined input variable \${$this->__title}['{$this->__varname}']", E_USER_NOTICE);
// run through filters anyway (for ->log)
}
// implicit ->array filter handling
if (is_array($data) and $first_handler != "array") {
array_unshift($this->__filter, "array");
}
// apply filters (we're building an ad-hoc merged array here, because ->apply works on the reference, and some filters expect ->__filter to contain the complete current list)
$this->__filter = array_merge($this->__filter, $this->__always);
$data = $this->apply($data, $this->__filter);
// the Traversable array interface resets the filter list after each request, see ->current()
if ($reset_filter_afterwards) {
$this->__filter = $reset_filter_afterwards;
}
// done
return $data;
}
/**
* Runs list of filters on data. Uses either methods, bound closures, or global functions
* if the filter name matches.
*
* It works on an array reference and with array_shift() because filters are allowed to
* modify the list at runtime (->array requires to).
*
*/
function apply($data, &$filterchain) {
while ($f = array_shift($filterchain)) {
list($filtername, $args) = is_array($f) ? $f : array($f, array());
// an override function name or closure exists
if (isset($this->{"_$filtername"})) {
$filtername = $this->{"_$filtername"};
}
// call _filter method
if (is_string($filtername) && method_exists($this, "_$filtername")) {
$data = call_user_func_array(array($this, "_$filtername"), array_merge(array($data), (array)$args));
}
// ordinary php function, or closure, or rebound method
elseif (is_callable($filtername)) {
$data = call_user_func_array($filtername, array_merge(array($data), $args));
}
else {
INPUT_QUIET>=2 or trigger_error("unknown filter '" . (is_scalar($filtername) ? $filtername : "closure") . "', falling back on wiping non-alpha characters from '{$this->__varname}'", E_USER_WARNING);
$data = $this->_name($data);
}
}
return $data;
}
/**
* @multiplex
*
* List data / array value handling.
*
* This virtual filter hijacks the original filter chain, and applies it
* to sub values.
*
*/
function _array($data) {
// save + swap out the current filter chain
list($multiplex, $this->__filter) = array($this->__filter, array());
// iteratively apply original filter chain on each array entry
$data = (array) $data;
foreach (array_keys($data) as $i) {
$chain = $multiplex;
$data[$i] = $this->apply($data[$i], $chain);
}
return $data;
}
/**
* @multiplex
*
* Grab a collection of input variables, names delimited by comma.
* Implicitly makes it an ->_array() list.
* The _array handler is implicitly used for indexed values. _list
* and _multi can be used for associative arrays, given a key list.
*
* @example extract($_GET->list->text["name,title,date,email,comment"]);
* @php5.4+ $_GET->list[['key1','key2','key3']];
*
* @bugs hacky, improper way to intercept, fetches from $__vars[] directly,
* uses $__varname instead of $data, may prevent replays,
* main will trigger a notice anyway as VAR1,VAR2,.. is undefined
*
*/
function _list($keys, $pass_array=FALSE) {
// get key list
if (is_array($this->__varname)) {
$keys = $this->__varname;
}
else {
$keys = explode(",", $this->__varname);
}
// slice out named values from ->__vars
$data = array_merge(
array_fill_keys($keys, NULL),
array_intersect_key($this->__vars, array_flip($keys))
);
// chain to _array multiplex handler
if (!$pass_array) {
return $this->_array($data);
}
// process fetched list as array (for user-land functions like http_build_query)
else {
return $data;
}
}
/**
* Processes collection of input variables.
* Passes list on as array to subsequent filters.
*
*/
function _multi($keys) {
return $this->_list($keys, "process_as_array");
}
/**
* @hide
*
* Ordinary method calls are captured here. Any ->method("name") will trigger
* the filter and return variable data, just like ->method["name"] would. It
* just allows to supply additional method parameters.
*
*/
function __call($filtername, $args) { // can have arguments
$this->__filter[] = array($filtername, array_slice($args, 1));
return $this->filter($args[0]);
}
/**
* @hide
*
* Wrapper to capture ->name->chain accesses.
*
*/
function __get($filtername) {
//
// we could do some heuristic chaining here,
// if the last entry in the ->attrib->attrib list is not a valid method name,
// but a valid varname, we should execute the filter chain rather than add.
//
// Unpack parameterized filter attributes, use U+2022 ellipsis … as delimiter
if (strpos($filtername, "…")) {
$args = explode("…", $filtername);
$filtername = array_shift($args);
}
else {
$args=array();
}
// Add filter to list
$this->__filter[] = count($args) ? array($filtername, $args) : $filtername;
// fluent interface
return $this;
}
/**
* @hide ArrayAccess
*
* Normal $_ARRAY["name"] syntax access is redirected through the filter here.
*
*/
function offsetGet($varname) {
// never chains
return $this->filter($varname);
}
/**
* @hide ArrayAccess
*
* Needed for commonplace isset($_POST["var"]) checks.
*
*/
function offsetExists($name) {
return isset($this->__vars[$name]);
}
/**
* @hide
* Sets value in array. Note that it only works for array["xy"]= top-level
* assignments. Subarrays are always retrieved by value (due to filtering)
* and cannot be set item-wise.
*
* @discouraged
* Manipulating the input array is indicative for state tampering and thus
* throws a notice per default.
*
*/
function offsetSet($name, $value) {
INPUT_QUIET or trigger_error("Manipulation of input variable \${$this->__title}['{$this->__varname}']", E_USER_NOTICE);
$this->__vars[$name] = $value;
}
/**
* @hide
* Removes entry.
*
* @discouraged
* Triggers a notice per default.
*
*/
function offsetUnset($name) {
INPUT_QUIET or trigger_error("Removed input variable \${$this->__title}['{$this->__varname}']", E_USER_NOTICE);
unset($this->__vars[$name]);
}
/**
* Generic array features.
* Due to being reserved words `isset` and `empty` need custom method names here:
*
* ->has(isset)
* ->no(empty)
* ->keys()
*
* Has No Keys seems easy to remember.
*
*/
/**
* isset/array_key_exists check;
* may list multiple keys to check.
*
*/
function has($args) {
$args = (func_num_args() > 1) ? func_get_args() : explode(",", $args);
return count(array_intersect_key($this->__vars, array_flip($args))) == count($args);
}
/**
* empty() probing,
* Tests if named keys are absent or falsy.
*
*/
function no($args) {
$args = (func_num_args() > 1) ? func_get_args() : explode(",", $args);
return count(array_filter(array_intersect_key($this->__vars, array_flip($args)))) == 0;
}
/**
* Returns list of all contained keys.
*
*/
function keys() {
return array_keys($this->__vars);
}
/**
* @hide Traversable
*
* Allows to loop over all array entries in a foreach loop. A supplied filterlist
* is reapplied for each iteration.
*
* - Basically all calls are mirrored onto ->__vars` internal array pointer.
*
*/
function current() {
return $this->filter(key($this->__vars), /*reset_filter_afterwards=to what it was before*/$this->__filter);
}
function key() {
return key($this->__vars);
}
function next() {
return next($this->__vars);
}
function rewind() {
return reset($this->__vars);
}
function valid() {
if (key($this->__vars) !== NULL) {
return TRUE;
}
else {
// also reset the filter list after we're done traversing all entries
$this->__filters=array();
return FALSE;
}
}
/**
* @hide Countable
*
*/
function count() {
return count($this->__vars);
}
/**
* @hide Make filtering functions available as static methods
* without underscore prefix for external invocation.
*/
static function __callStatic($func, $args) {
static $filter = "input";
// Also eschew E_STRICT notices
if (!is_object($filter)) {
$filter = new input(array(), "\$_INLINE_INPUT");
}
return isset($filter->{"_$func"})
? call_user_func_array($filter->{"_$func"}, $args)
: call_user_func_array(array($filter, "_$func"), $args);
}
/**
* @hide Allows testing variable presence with e.g. if ( $_POST() )
* Alternatively $_POST("var") is an alias to $_POST["var"].
*
*/
function __invoke($varname=NULL) {
// treat it as variable access
if (!is_null($varname)) {
return $this->offsetGet($varname);
}
// do the count() call
else {
return $this->count();
}
}
}
/**
* @autorun
*
*/
$_SERVER = new input($_SERVER, "_SERVER");
$_REQUEST = new input($_REQUEST, "_REQUEST");
$_GET = new input($_GET, "_GET");
$_POST = new input($_POST, "_POST");
$_COOKIE = new input($_COOKIE, "_COOKIE");
#$_SESSION
#$_ENV
#$_FILES required a special handler
?>