htmlpurifier/library/HTMLPurifier/CSSDefinition.php

<?php

/**
 * Defines allowed CSS attributes and what their values are.
 * @see HTMLPurifier_HTMLDefinition
 */
class HTMLPurifier_CSSDefinition extends HTMLPurifier_Definition
{

    public $type = 'CSS';

    /**
     * Assoc array of attribute name to definition object.
     */
    public $info = array();

    /**
     * Constructs the info array.  The meat of this class.
     */
    protected function doSetup($config) {

        $this->info['text-align'] = new HTMLPurifier_AttrDef_Enum(
            array('left', 'right', 'center', 'justify'), false);

        $border_style =
        $this->info['border-bottom-style'] =
        $this->info['border-right-style'] =
        $this->info['border-left-style'] =
        $this->info['border-top-style'] =  new HTMLPurifier_AttrDef_Enum(
            array('none', 'hidden', 'dotted', 'dashed', 'solid', 'double',
            'groove', 'ridge', 'inset', 'outset'), false);

        $this->info['border-style'] = new HTMLPurifier_AttrDef_CSS_Multiple($border_style);

        $this->info['clear'] = new HTMLPurifier_AttrDef_Enum(
            array('none', 'left', 'right', 'both'), false);
        $this->info['float'] = new HTMLPurifier_AttrDef_Enum(
            array('none', 'left', 'right'), false);
        $this->info['font-style'] = new HTMLPurifier_AttrDef_Enum(
            array('normal', 'italic', 'oblique'), false);
        $this->info['font-variant'] = new HTMLPurifier_AttrDef_Enum(
            array('normal', 'small-caps'), false);

        $uri_or_none = new HTMLPurifier_AttrDef_CSS_Composite(
            array(
                new HTMLPurifier_AttrDef_Enum(array('none')),
                new HTMLPurifier_AttrDef_CSS_URI()
            )
        );

        $this->info['list-style-position'] = new HTMLPurifier_AttrDef_Enum(
            array('inside', 'outside'), false);
        $this->info['list-style-type'] = new HTMLPurifier_AttrDef_Enum(
            array('disc', 'circle', 'square', 'decimal', 'lower-roman',
            'upper-roman', 'lower-alpha', 'upper-alpha', 'none'), false);
        $this->info['list-style-image'] = $uri_or_none;

        $this->info['list-style'] = new HTMLPurifier_AttrDef_CSS_ListStyle($config);

        $this->info['text-transform'] = new HTMLPurifier_AttrDef_Enum(
            array('capitalize', 'uppercase', 'lowercase', 'none'), false);
        $this->info['color'] = new HTMLPurifier_AttrDef_CSS_Color();

        $this->info['background-image'] = $uri_or_none;
        $this->info['background-repeat'] = new HTMLPurifier_AttrDef_Enum(
            array('repeat', 'repeat-x', 'repeat-y', 'no-repeat')
        );
        $this->info['background-attachment'] = new HTMLPurifier_AttrDef_Enum(
            array('scroll', 'fixed')
        );
        $this->info['background-position'] = new HTMLPurifier_AttrDef_CSS_BackgroundPosition();

        $border_color =
        $this->info['border-top-color'] =
        $this->info['border-bottom-color'] =
        $this->info['border-left-color'] =
        $this->info['border-right-color'] =
        $this->info['background-color'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
            new HTMLPurifier_AttrDef_Enum(array('transparent')),
            new HTMLPurifier_AttrDef_CSS_Color()
        ));

        $this->info['background'] = new HTMLPurifier_AttrDef_CSS_Background($config);

        $this->info['border-color'] = new HTMLPurifier_AttrDef_CSS_Multiple($border_color);

        $border_width =
        $this->info['border-top-width'] =
        $this->info['border-bottom-width'] =
        $this->info['border-left-width'] =
        $this->info['border-right-width'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
            new HTMLPurifier_AttrDef_Enum(array('thin', 'medium', 'thick')),
            new HTMLPurifier_AttrDef_CSS_Length('0') //disallow negative
        ));

        $this->info['border-width'] = new HTMLPurifier_AttrDef_CSS_Multiple($border_width);

        $this->info['letter-spacing'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
            new HTMLPurifier_AttrDef_Enum(array('normal')),
            new HTMLPurifier_AttrDef_CSS_Length()
        ));

        $this->info['word-spacing'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
            new HTMLPurifier_AttrDef_Enum(array('normal')),
            new HTMLPurifier_AttrDef_CSS_Length()
        ));

        $this->info['font-size'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
            new HTMLPurifier_AttrDef_Enum(array('xx-small', 'x-small',
                'small', 'medium', 'large', 'x-large', 'xx-large',
                'larger', 'smaller')),
            new HTMLPurifier_AttrDef_CSS_Percentage(),
            new HTMLPurifier_AttrDef_CSS_Length()
        ));

        $this->info['line-height'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
            new HTMLPurifier_AttrDef_Enum(array('normal')),
            new HTMLPurifier_AttrDef_CSS_Number(true), // no negatives
            new HTMLPurifier_AttrDef_CSS_Length('0'),
            new HTMLPurifier_AttrDef_CSS_Percentage(true)
        ));

        $margin =
        $this->info['margin-top'] =
        $this->info['margin-bottom'] =
        $this->info['margin-left'] =
        $this->info['margin-right'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
            new HTMLPurifier_AttrDef_CSS_Length(),
            new HTMLPurifier_AttrDef_CSS_Percentage(),
            new HTMLPurifier_AttrDef_Enum(array('auto'))
        ));

        $this->info['margin'] = new HTMLPurifier_AttrDef_CSS_Multiple($margin);

        // non-negative
        $padding =
        $this->info['padding-top'] =
        $this->info['padding-bottom'] =
        $this->info['padding-left'] =
        $this->info['padding-right'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
            new HTMLPurifier_AttrDef_CSS_Length('0'),
            new HTMLPurifier_AttrDef_CSS_Percentage(true)
        ));

        $this->info['padding'] = new HTMLPurifier_AttrDef_CSS_Multiple($padding);

        $this->info['text-indent'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
            new HTMLPurifier_AttrDef_CSS_Length(),
            new HTMLPurifier_AttrDef_CSS_Percentage()
        ));

        $trusted_wh = new HTMLPurifier_AttrDef_CSS_Composite(array(
            new HTMLPurifier_AttrDef_CSS_Length('0'),
            new HTMLPurifier_AttrDef_CSS_Percentage(true),
            new HTMLPurifier_AttrDef_Enum(array('auto'))
        ));
        $max = $config->get('CSS.MaxImgLength');

        $this->info['width'] =
        $this->info['height'] =
            $max === null ?
            $trusted_wh :
            new HTMLPurifier_AttrDef_Switch('img',
                // For img tags:
                new HTMLPurifier_AttrDef_CSS_Composite(array(
                    new HTMLPurifier_AttrDef_CSS_Length('0', $max),
                    new HTMLPurifier_AttrDef_Enum(array('auto'))
                )),
                // For everyone else:
                $trusted_wh
            );

        $this->info['text-decoration'] = new HTMLPurifier_AttrDef_CSS_TextDecoration();

        $this->info['font-family'] = new HTMLPurifier_AttrDef_CSS_FontFamily();

        // this could use specialized code
        $this->info['font-weight'] = new HTMLPurifier_AttrDef_Enum(
            array('normal', 'bold', 'bolder', 'lighter', '100', '200', '300',
            '400', '500', '600', '700', '800', '900'), false);

        // MUST be called after other font properties, as it references
        // a CSSDefinition object
        $this->info['font'] = new HTMLPurifier_AttrDef_CSS_Font($config);

        // same here
        $this->info['border'] =
        $this->info['border-bottom'] =
        $this->info['border-top'] =
        $this->info['border-left'] =
        $this->info['border-right'] = new HTMLPurifier_AttrDef_CSS_Border($config);

        $this->info['border-collapse'] = new HTMLPurifier_AttrDef_Enum(array(
            'collapse', 'separate'));

        $this->info['caption-side'] = new HTMLPurifier_AttrDef_Enum(array(
            'top', 'bottom'));

        $this->info['table-layout'] = new HTMLPurifier_AttrDef_Enum(array(
            'auto', 'fixed'));

        $this->info['vertical-align'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
            new HTMLPurifier_AttrDef_Enum(array('baseline', 'sub', 'super',
                'top', 'text-top', 'middle', 'bottom', 'text-bottom')),
            new HTMLPurifier_AttrDef_CSS_Length(),
            new HTMLPurifier_AttrDef_CSS_Percentage()
        ));

        $this->info['border-spacing'] = new HTMLPurifier_AttrDef_CSS_Multiple(new HTMLPurifier_AttrDef_CSS_Length(), 2);

        // partial support
        $this->info['white-space'] = new HTMLPurifier_AttrDef_Enum(array('nowrap'));

        if ($config->get('CSS.Proprietary')) {
            $this->doSetupProprietary($config);
        }

        if ($config->get('CSS.AllowTricky')) {
            $this->doSetupTricky($config);
        }

        if ($config->get('CSS.Trusted')) {
            $this->doSetupTrusted($config);
        }

        $allow_important = $config->get('CSS.AllowImportant');
        // wrap all attr-defs with decorator that handles !important
        foreach ($this->info as $k => $v) {
            $this->info[$k] = new HTMLPurifier_AttrDef_CSS_ImportantDecorator($v, $allow_important);
        }

        $this->setupConfigStuff($config);
    }

    protected function doSetupProprietary($config) {
        // Internet Explorer only scrollbar colors
        $this->info['scrollbar-arrow-color']        = new HTMLPurifier_AttrDef_CSS_Color();
        $this->info['scrollbar-base-color']         = new HTMLPurifier_AttrDef_CSS_Color();
        $this->info['scrollbar-darkshadow-color']   = new HTMLPurifier_AttrDef_CSS_Color();
        $this->info['scrollbar-face-color']         = new HTMLPurifier_AttrDef_CSS_Color();
        $this->info['scrollbar-highlight-color']    = new HTMLPurifier_AttrDef_CSS_Color();
        $this->info['scrollbar-shadow-color']       = new HTMLPurifier_AttrDef_CSS_Color();

        // technically not proprietary, but CSS3, and no one supports it
        $this->info['opacity']          = new HTMLPurifier_AttrDef_CSS_AlphaValue();
        $this->info['-moz-opacity']     = new HTMLPurifier_AttrDef_CSS_AlphaValue();
        $this->info['-khtml-opacity']   = new HTMLPurifier_AttrDef_CSS_AlphaValue();

        // only opacity, for now
        $this->info['filter'] = new HTMLPurifier_AttrDef_CSS_Filter();

    }

    protected function doSetupTricky($config) {
        $this->info['display'] = new HTMLPurifier_AttrDef_Enum(array(
            'inline', 'block', 'list-item', 'run-in', 'compact',
            'marker', 'table', 'inline-table', 'table-row-group',
            'table-header-group', 'table-footer-group', 'table-row',
            'table-column-group', 'table-column', 'table-cell', 'table-caption', 'none'
        ));
        $this->info['visibility'] = new HTMLPurifier_AttrDef_Enum(array(
            'visible', 'hidden', 'collapse'
        ));
        $this->info['overflow'] = new HTMLPurifier_AttrDef_Enum(array('visible', 'hidden', 'auto', 'scroll'));
    }

    protected function doSetupTrusted($config) {
        $this->info['position'] = new HTMLPurifier_AttrDef_Enum(array(
            'static', 'relative', 'absolute', 'fixed'
        ));
        $this->info['top'] =
        $this->info['left'] =
        $this->info['right'] =
        $this->info['bottom'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
            new HTMLPurifier_AttrDef_CSS_Length(),
            new HTMLPurifier_AttrDef_CSS_Percentage(),
            new HTMLPurifier_AttrDef_Enum(array('auto')),
        ));
        $this->info['z-index'] = new HTMLPurifier_AttrDef_CSS_Composite(array(
            new HTMLPurifier_AttrDef_Integer(),
            new HTMLPurifier_AttrDef_Enum(array('auto')),
        ));
    }

    /**
     * Performs extra config-based processing. Based off of
     * HTMLPurifier_HTMLDefinition.
     * @todo Refactor duplicate elements into common class (probably using
     *       composition, not inheritance).
     */
    protected function setupConfigStuff($config) {

        // setup allowed elements
        $support = "(for information on implementing this, see the ".
                   "support forums) ";
        $allowed_properties = $config->get('CSS.AllowedProperties');
        if ($allowed_properties !== null) {
            foreach ($this->info as $name => $d) {
                if(!isset($allowed_properties[$name])) unset($this->info[$name]);
                unset($allowed_properties[$name]);
            }
            // emit errors
            foreach ($allowed_properties as $name => $d) {
                // :TODO: Is this htmlspecialchars() call really necessary?
                $name = htmlspecialchars($name);
                trigger_error("Style attribute '$name' is not supported $support", E_USER_WARNING);
            }
        }

        $forbidden_properties = $config->get('CSS.ForbiddenProperties');
        if ($forbidden_properties !== null) {
            foreach ($this->info as $name => $d) {
                if (isset($forbidden_properties[$name])) {
                    unset($this->info[$name]);
                }
            }
        }

    }
}

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