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authorMike Macgirvin <mike@macgirvin.com>2010-09-08 20:14:17 -0700
committerMike Macgirvin <mike@macgirvin.com>2010-09-08 20:14:17 -0700
commitffb1997902facb36b78a7cfa522f41f2b3d71cda (patch)
treee9fe47acf26c5fd2c742677f2610b60d3008eb26 /library/HTMLPurifier/AttrTransform
parentb49858b038a0a05bbe7685929e88071d0e125538 (diff)
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Diffstat (limited to 'library/HTMLPurifier/AttrTransform')
-rw-r--r--library/HTMLPurifier/AttrTransform/Background.php23
-rw-r--r--library/HTMLPurifier/AttrTransform/BdoDir.php19
-rw-r--r--library/HTMLPurifier/AttrTransform/BgColor.php23
-rw-r--r--library/HTMLPurifier/AttrTransform/BoolToCSS.php36
-rw-r--r--library/HTMLPurifier/AttrTransform/Border.php18
-rw-r--r--library/HTMLPurifier/AttrTransform/EnumToCSS.php58
-rw-r--r--library/HTMLPurifier/AttrTransform/ImgRequired.php43
-rw-r--r--library/HTMLPurifier/AttrTransform/ImgSpace.php44
-rw-r--r--library/HTMLPurifier/AttrTransform/Input.php40
-rw-r--r--library/HTMLPurifier/AttrTransform/Lang.php28
-rw-r--r--library/HTMLPurifier/AttrTransform/Length.php27
-rw-r--r--library/HTMLPurifier/AttrTransform/Name.php21
-rw-r--r--library/HTMLPurifier/AttrTransform/NameSync.php27
-rw-r--r--library/HTMLPurifier/AttrTransform/SafeEmbed.php15
-rw-r--r--library/HTMLPurifier/AttrTransform/SafeObject.php16
-rw-r--r--library/HTMLPurifier/AttrTransform/SafeParam.php56
-rw-r--r--library/HTMLPurifier/AttrTransform/ScriptRequired.php16
-rw-r--r--library/HTMLPurifier/AttrTransform/Textarea.php18
18 files changed, 528 insertions, 0 deletions
diff --git a/library/HTMLPurifier/AttrTransform/Background.php b/library/HTMLPurifier/AttrTransform/Background.php
new file mode 100644
index 000000000..0e1ff24a3
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/Background.php
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * Pre-transform that changes proprietary background attribute to CSS.
+ */
+class HTMLPurifier_AttrTransform_Background extends HTMLPurifier_AttrTransform {
+
+ public function transform($attr, $config, $context) {
+
+ if (!isset($attr['background'])) return $attr;
+
+ $background = $this->confiscateAttr($attr, 'background');
+ // some validation should happen here
+
+ $this->prependCSS($attr, "background-image:url($background);");
+
+ return $attr;
+
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/BdoDir.php b/library/HTMLPurifier/AttrTransform/BdoDir.php
new file mode 100644
index 000000000..4d1a05665
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/BdoDir.php
@@ -0,0 +1,19 @@
+<?php
+
+// this MUST be placed in post, as it assumes that any value in dir is valid
+
+/**
+ * Post-trasnform that ensures that bdo tags have the dir attribute set.
+ */
+class HTMLPurifier_AttrTransform_BdoDir extends HTMLPurifier_AttrTransform
+{
+
+ public function transform($attr, $config, $context) {
+ if (isset($attr['dir'])) return $attr;
+ $attr['dir'] = $config->get('Attr.DefaultTextDir');
+ return $attr;
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/BgColor.php b/library/HTMLPurifier/AttrTransform/BgColor.php
new file mode 100644
index 000000000..ad3916bb9
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/BgColor.php
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * Pre-transform that changes deprecated bgcolor attribute to CSS.
+ */
+class HTMLPurifier_AttrTransform_BgColor extends HTMLPurifier_AttrTransform {
+
+ public function transform($attr, $config, $context) {
+
+ if (!isset($attr['bgcolor'])) return $attr;
+
+ $bgcolor = $this->confiscateAttr($attr, 'bgcolor');
+ // some validation should happen here
+
+ $this->prependCSS($attr, "background-color:$bgcolor;");
+
+ return $attr;
+
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/BoolToCSS.php b/library/HTMLPurifier/AttrTransform/BoolToCSS.php
new file mode 100644
index 000000000..51159b671
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/BoolToCSS.php
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * Pre-transform that changes converts a boolean attribute to fixed CSS
+ */
+class HTMLPurifier_AttrTransform_BoolToCSS extends HTMLPurifier_AttrTransform {
+
+ /**
+ * Name of boolean attribute that is trigger
+ */
+ protected $attr;
+
+ /**
+ * CSS declarations to add to style, needs trailing semicolon
+ */
+ protected $css;
+
+ /**
+ * @param $attr string attribute name to convert from
+ * @param $css string CSS declarations to add to style (needs semicolon)
+ */
+ public function __construct($attr, $css) {
+ $this->attr = $attr;
+ $this->css = $css;
+ }
+
+ public function transform($attr, $config, $context) {
+ if (!isset($attr[$this->attr])) return $attr;
+ unset($attr[$this->attr]);
+ $this->prependCSS($attr, $this->css);
+ return $attr;
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/Border.php b/library/HTMLPurifier/AttrTransform/Border.php
new file mode 100644
index 000000000..476b0b079
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/Border.php
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * Pre-transform that changes deprecated border attribute to CSS.
+ */
+class HTMLPurifier_AttrTransform_Border extends HTMLPurifier_AttrTransform {
+
+ public function transform($attr, $config, $context) {
+ if (!isset($attr['border'])) return $attr;
+ $border_width = $this->confiscateAttr($attr, 'border');
+ // some validation should happen here
+ $this->prependCSS($attr, "border:{$border_width}px solid;");
+ return $attr;
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/EnumToCSS.php b/library/HTMLPurifier/AttrTransform/EnumToCSS.php
new file mode 100644
index 000000000..2a5b4514a
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/EnumToCSS.php
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * Generic pre-transform that converts an attribute with a fixed number of
+ * values (enumerated) to CSS.
+ */
+class HTMLPurifier_AttrTransform_EnumToCSS extends HTMLPurifier_AttrTransform {
+
+ /**
+ * Name of attribute to transform from
+ */
+ protected $attr;
+
+ /**
+ * Lookup array of attribute values to CSS
+ */
+ protected $enumToCSS = array();
+
+ /**
+ * Case sensitivity of the matching
+ * @warning Currently can only be guaranteed to work with ASCII
+ * values.
+ */
+ protected $caseSensitive = false;
+
+ /**
+ * @param $attr String attribute name to transform from
+ * @param $enumToCSS Lookup array of attribute values to CSS
+ * @param $case_sensitive Boolean case sensitivity indicator, default false
+ */
+ public function __construct($attr, $enum_to_css, $case_sensitive = false) {
+ $this->attr = $attr;
+ $this->enumToCSS = $enum_to_css;
+ $this->caseSensitive = (bool) $case_sensitive;
+ }
+
+ public function transform($attr, $config, $context) {
+
+ if (!isset($attr[$this->attr])) return $attr;
+
+ $value = trim($attr[$this->attr]);
+ unset($attr[$this->attr]);
+
+ if (!$this->caseSensitive) $value = strtolower($value);
+
+ if (!isset($this->enumToCSS[$value])) {
+ return $attr;
+ }
+
+ $this->prependCSS($attr, $this->enumToCSS[$value]);
+
+ return $attr;
+
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/ImgRequired.php b/library/HTMLPurifier/AttrTransform/ImgRequired.php
new file mode 100644
index 000000000..7f0e4b7a5
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/ImgRequired.php
@@ -0,0 +1,43 @@
+<?php
+
+// must be called POST validation
+
+/**
+ * Transform that supplies default values for the src and alt attributes
+ * in img tags, as well as prevents the img tag from being removed
+ * because of a missing alt tag. This needs to be registered as both
+ * a pre and post attribute transform.
+ */
+class HTMLPurifier_AttrTransform_ImgRequired extends HTMLPurifier_AttrTransform
+{
+
+ public function transform($attr, $config, $context) {
+
+ $src = true;
+ if (!isset($attr['src'])) {
+ if ($config->get('Core.RemoveInvalidImg')) return $attr;
+ $attr['src'] = $config->get('Attr.DefaultInvalidImage');
+ $src = false;
+ }
+
+ if (!isset($attr['alt'])) {
+ if ($src) {
+ $alt = $config->get('Attr.DefaultImageAlt');
+ if ($alt === null) {
+ // truncate if the alt is too long
+ $attr['alt'] = substr(basename($attr['src']),0,40);
+ } else {
+ $attr['alt'] = $alt;
+ }
+ } else {
+ $attr['alt'] = $config->get('Attr.DefaultInvalidImageAlt');
+ }
+ }
+
+ return $attr;
+
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/ImgSpace.php b/library/HTMLPurifier/AttrTransform/ImgSpace.php
new file mode 100644
index 000000000..fd84c10c3
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/ImgSpace.php
@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * Pre-transform that changes deprecated hspace and vspace attributes to CSS
+ */
+class HTMLPurifier_AttrTransform_ImgSpace extends HTMLPurifier_AttrTransform {
+
+ protected $attr;
+ protected $css = array(
+ 'hspace' => array('left', 'right'),
+ 'vspace' => array('top', 'bottom')
+ );
+
+ public function __construct($attr) {
+ $this->attr = $attr;
+ if (!isset($this->css[$attr])) {
+ trigger_error(htmlspecialchars($attr) . ' is not valid space attribute');
+ }
+ }
+
+ public function transform($attr, $config, $context) {
+
+ if (!isset($attr[$this->attr])) return $attr;
+
+ $width = $this->confiscateAttr($attr, $this->attr);
+ // some validation could happen here
+
+ if (!isset($this->css[$this->attr])) return $attr;
+
+ $style = '';
+ foreach ($this->css[$this->attr] as $suffix) {
+ $property = "margin-$suffix";
+ $style .= "$property:{$width}px;";
+ }
+
+ $this->prependCSS($attr, $style);
+
+ return $attr;
+
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/Input.php b/library/HTMLPurifier/AttrTransform/Input.php
new file mode 100644
index 000000000..16829552d
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/Input.php
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * Performs miscellaneous cross attribute validation and filtering for
+ * input elements. This is meant to be a post-transform.
+ */
+class HTMLPurifier_AttrTransform_Input extends HTMLPurifier_AttrTransform {
+
+ protected $pixels;
+
+ public function __construct() {
+ $this->pixels = new HTMLPurifier_AttrDef_HTML_Pixels();
+ }
+
+ public function transform($attr, $config, $context) {
+ if (!isset($attr['type'])) $t = 'text';
+ else $t = strtolower($attr['type']);
+ if (isset($attr['checked']) && $t !== 'radio' && $t !== 'checkbox') {
+ unset($attr['checked']);
+ }
+ if (isset($attr['maxlength']) && $t !== 'text' && $t !== 'password') {
+ unset($attr['maxlength']);
+ }
+ if (isset($attr['size']) && $t !== 'text' && $t !== 'password') {
+ $result = $this->pixels->validate($attr['size'], $config, $context);
+ if ($result === false) unset($attr['size']);
+ else $attr['size'] = $result;
+ }
+ if (isset($attr['src']) && $t !== 'image') {
+ unset($attr['src']);
+ }
+ if (!isset($attr['value']) && ($t === 'radio' || $t === 'checkbox')) {
+ $attr['value'] = '';
+ }
+ return $attr;
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/Lang.php b/library/HTMLPurifier/AttrTransform/Lang.php
new file mode 100644
index 000000000..5869e7f82
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/Lang.php
@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * Post-transform that copies lang's value to xml:lang (and vice-versa)
+ * @note Theoretically speaking, this could be a pre-transform, but putting
+ * post is more efficient.
+ */
+class HTMLPurifier_AttrTransform_Lang extends HTMLPurifier_AttrTransform
+{
+
+ public function transform($attr, $config, $context) {
+
+ $lang = isset($attr['lang']) ? $attr['lang'] : false;
+ $xml_lang = isset($attr['xml:lang']) ? $attr['xml:lang'] : false;
+
+ if ($lang !== false && $xml_lang === false) {
+ $attr['xml:lang'] = $lang;
+ } elseif ($xml_lang !== false) {
+ $attr['lang'] = $xml_lang;
+ }
+
+ return $attr;
+
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/Length.php b/library/HTMLPurifier/AttrTransform/Length.php
new file mode 100644
index 000000000..ea2f30473
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/Length.php
@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * Class for handling width/height length attribute transformations to CSS
+ */
+class HTMLPurifier_AttrTransform_Length extends HTMLPurifier_AttrTransform
+{
+
+ protected $name;
+ protected $cssName;
+
+ public function __construct($name, $css_name = null) {
+ $this->name = $name;
+ $this->cssName = $css_name ? $css_name : $name;
+ }
+
+ public function transform($attr, $config, $context) {
+ if (!isset($attr[$this->name])) return $attr;
+ $length = $this->confiscateAttr($attr, $this->name);
+ if(ctype_digit($length)) $length .= 'px';
+ $this->prependCSS($attr, $this->cssName . ":$length;");
+ return $attr;
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/Name.php b/library/HTMLPurifier/AttrTransform/Name.php
new file mode 100644
index 000000000..15315bc73
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/Name.php
@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * Pre-transform that changes deprecated name attribute to ID if necessary
+ */
+class HTMLPurifier_AttrTransform_Name extends HTMLPurifier_AttrTransform
+{
+
+ public function transform($attr, $config, $context) {
+ // Abort early if we're using relaxed definition of name
+ if ($config->get('HTML.Attr.Name.UseCDATA')) return $attr;
+ if (!isset($attr['name'])) return $attr;
+ $id = $this->confiscateAttr($attr, 'name');
+ if ( isset($attr['id'])) return $attr;
+ $attr['id'] = $id;
+ return $attr;
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/NameSync.php b/library/HTMLPurifier/AttrTransform/NameSync.php
new file mode 100644
index 000000000..a95638c14
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/NameSync.php
@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * Post-transform that performs validation to the name attribute; if
+ * it is present with an equivalent id attribute, it is passed through;
+ * otherwise validation is performed.
+ */
+class HTMLPurifier_AttrTransform_NameSync extends HTMLPurifier_AttrTransform
+{
+
+ public function __construct() {
+ $this->idDef = new HTMLPurifier_AttrDef_HTML_ID();
+ }
+
+ public function transform($attr, $config, $context) {
+ if (!isset($attr['name'])) return $attr;
+ $name = $attr['name'];
+ if (isset($attr['id']) && $attr['id'] === $name) return $attr;
+ $result = $this->idDef->validate($name, $config, $context);
+ if ($result === false) unset($attr['name']);
+ else $attr['name'] = $result;
+ return $attr;
+ }
+
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/SafeEmbed.php b/library/HTMLPurifier/AttrTransform/SafeEmbed.php
new file mode 100644
index 000000000..4da449981
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/SafeEmbed.php
@@ -0,0 +1,15 @@
+<?php
+
+class HTMLPurifier_AttrTransform_SafeEmbed extends HTMLPurifier_AttrTransform
+{
+ public $name = "SafeEmbed";
+
+ public function transform($attr, $config, $context) {
+ $attr['allowscriptaccess'] = 'never';
+ $attr['allownetworking'] = 'internal';
+ $attr['type'] = 'application/x-shockwave-flash';
+ return $attr;
+ }
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/SafeObject.php b/library/HTMLPurifier/AttrTransform/SafeObject.php
new file mode 100644
index 000000000..1ed74898b
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/SafeObject.php
@@ -0,0 +1,16 @@
+<?php
+
+/**
+ * Writes default type for all objects. Currently only supports flash.
+ */
+class HTMLPurifier_AttrTransform_SafeObject extends HTMLPurifier_AttrTransform
+{
+ public $name = "SafeObject";
+
+ function transform($attr, $config, $context) {
+ if (!isset($attr['type'])) $attr['type'] = 'application/x-shockwave-flash';
+ return $attr;
+ }
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/SafeParam.php b/library/HTMLPurifier/AttrTransform/SafeParam.php
new file mode 100644
index 000000000..3f992ec31
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/SafeParam.php
@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * Validates name/value pairs in param tags to be used in safe objects. This
+ * will only allow name values it recognizes, and pre-fill certain attributes
+ * with required values.
+ *
+ * @note
+ * This class only supports Flash. In the future, Quicktime support
+ * may be added.
+ *
+ * @warning
+ * This class expects an injector to add the necessary parameters tags.
+ */
+class HTMLPurifier_AttrTransform_SafeParam extends HTMLPurifier_AttrTransform
+{
+ public $name = "SafeParam";
+ private $uri;
+
+ public function __construct() {
+ $this->uri = new HTMLPurifier_AttrDef_URI(true); // embedded
+ }
+
+ public function transform($attr, $config, $context) {
+ // If we add support for other objects, we'll need to alter the
+ // transforms.
+ switch ($attr['name']) {
+ // application/x-shockwave-flash
+ // Keep this synchronized with Injector/SafeObject.php
+ case 'allowScriptAccess':
+ $attr['value'] = 'never';
+ break;
+ case 'allowNetworking':
+ $attr['value'] = 'internal';
+ break;
+ case 'wmode':
+ $attr['value'] = 'window';
+ break;
+ case 'movie':
+ case 'src':
+ $attr['name'] = "movie";
+ $attr['value'] = $this->uri->validate($attr['value'], $config, $context);
+ break;
+ case 'flashvars':
+ // we're going to allow arbitrary inputs to the SWF, on
+ // the reasoning that it could only hack the SWF, not us.
+ break;
+ // add other cases to support other param name/value pairs
+ default:
+ $attr['name'] = $attr['value'] = null;
+ }
+ return $attr;
+ }
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/ScriptRequired.php b/library/HTMLPurifier/AttrTransform/ScriptRequired.php
new file mode 100644
index 000000000..4499050a2
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/ScriptRequired.php
@@ -0,0 +1,16 @@
+<?php
+
+/**
+ * Implements required attribute stipulation for <script>
+ */
+class HTMLPurifier_AttrTransform_ScriptRequired extends HTMLPurifier_AttrTransform
+{
+ public function transform($attr, $config, $context) {
+ if (!isset($attr['type'])) {
+ $attr['type'] = 'text/javascript';
+ }
+ return $attr;
+ }
+}
+
+// vim: et sw=4 sts=4
diff --git a/library/HTMLPurifier/AttrTransform/Textarea.php b/library/HTMLPurifier/AttrTransform/Textarea.php
new file mode 100644
index 000000000..81ac3488b
--- /dev/null
+++ b/library/HTMLPurifier/AttrTransform/Textarea.php
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * Sets height/width defaults for <textarea>
+ */
+class HTMLPurifier_AttrTransform_Textarea extends HTMLPurifier_AttrTransform
+{
+
+ public function transform($attr, $config, $context) {
+ // Calculated from Firefox
+ if (!isset($attr['cols'])) $attr['cols'] = '22';
+ if (!isset($attr['rows'])) $attr['rows'] = '3';
+ return $attr;
+ }
+
+}
+
+// vim: et sw=4 sts=4