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921 lines
36 KiB
PHP
921 lines
36 KiB
PHP
<?php
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/**
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+-----------------------------------------------------------------------+
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| This file is part of the Roundcube Webmail client |
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| Copyright (C) The Roundcube Dev Team |
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| Licensed under the GNU General Public License version 3 or |
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| any later version with exceptions for skins & plugins. |
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| See the README file for a full license statement. |
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| PURPOSE: |
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| Utility class providing HTML sanityzer (based on Washtml class) |
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+-----------------------------------------------------------------------+
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| Author: Thomas Bruederli <roundcube@gmail.com> |
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| Author: Aleksander Machniak <alec@alec.pl> |
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| Author: Frederic Motte <fmotte@ubixis.com> |
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+-----------------------------------------------------------------------+
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Washtml, a HTML sanityzer.
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Copyright (c) 2007 Frederic Motte <fmotte@ubixis.com>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* Utility class providing HTML sanityzer
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*
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* @package Framework
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* @subpackage Utils
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*/
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class rcube_washtml
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{
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/**
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* @var array Allowed HTML elements (default)
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*/
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static $html_elements = array('a', 'abbr', 'acronym', 'address', 'area', 'b',
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'basefont', 'bdo', 'big', 'blockquote', 'br', 'caption', 'center',
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'cite', 'code', 'col', 'colgroup', 'dd', 'del', 'dfn', 'dir', 'div', 'dl',
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'dt', 'em', 'fieldset', 'font', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hr', 'i',
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'ins', 'label', 'legend', 'li', 'map', 'menu', 'nobr', 'ol', 'p', 'pre', 'q',
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's', 'samp', 'small', 'span', 'strike', 'strong', 'sub', 'sup', 'table',
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'tbody', 'td', 'tfoot', 'th', 'thead', 'tr', 'tt', 'u', 'ul', 'var', 'wbr', 'img',
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'video', 'source',
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// form elements
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'button', 'input', 'textarea', 'select', 'option', 'optgroup',
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// SVG
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'svg', 'altglyph', 'altglyphdef', 'altglyphitem', 'animate',
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'animatecolor', 'animatetransform', 'circle', 'clippath', 'defs', 'desc',
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'ellipse', 'font', 'g', 'glyph', 'glyphref', 'hkern', 'image', 'line',
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'lineargradient', 'marker', 'mask', 'mpath', 'path', 'pattern',
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'polygon', 'polyline', 'radialgradient', 'rect', 'set', 'stop', 'switch', 'symbol',
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'text', 'textpath', 'tref', 'tspan', 'use', 'view', 'vkern', 'filter',
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// SVG Filters
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'feblend', 'fecolormatrix', 'fecomponenttransfer', 'fecomposite',
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'feconvolvematrix', 'fediffuselighting', 'fedisplacementmap',
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'feflood', 'fefunca', 'fefuncb', 'fefuncg', 'fefuncr', 'fegaussianblur',
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'feimage', 'femerge', 'femergenode', 'femorphology', 'feoffset',
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'fespecularlighting', 'fetile', 'feturbulence',
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// MathML
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'math', 'menclose', 'merror', 'mfenced', 'mfrac', 'mglyph', 'mi', 'mlabeledtr',
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'mmuliscripts', 'mn', 'mo', 'mover', 'mpadded', 'mphantom', 'mroot', 'mrow',
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'ms', 'mspace', 'msqrt', 'mstyle', 'msub', 'msup', 'msubsup', 'mtable', 'mtd',
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'mtext', 'mtr', 'munder', 'munderover', 'maligngroup', 'malignmark',
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'mprescripts', 'semantics', 'annotation', 'annotation-xml', 'none',
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'infinity', 'matrix', 'matrixrow', 'ci', 'cn', 'sep', 'apply',
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'plus', 'minus', 'eq', 'power', 'times', 'divide', 'csymbol', 'root',
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'bvar', 'lowlimit', 'uplimit',
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);
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/**
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* @var array Ignore these HTML tags and their content
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*/
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static $ignore_elements = array('script', 'applet', 'embed', 'object', 'style');
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/**
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* @var array Allowed HTML attributes
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*/
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static $html_attribs = array('name', 'class', 'title', 'alt', 'width', 'height',
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'align', 'nowrap', 'col', 'row', 'id', 'rowspan', 'colspan', 'cellspacing',
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'cellpadding', 'valign', 'bgcolor', 'color', 'border', 'bordercolorlight',
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'bordercolordark', 'face', 'marginwidth', 'marginheight', 'axis', 'border',
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'abbr', 'char', 'charoff', 'clear', 'compact', 'coords', 'vspace', 'hspace',
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'cellborder', 'size', 'lang', 'dir', 'usemap', 'shape', 'media',
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'background', 'src', 'poster', 'href', 'headers',
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// attributes of form elements
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'type', 'rows', 'cols', 'disabled', 'readonly', 'checked', 'multiple', 'value', 'for',
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// SVG
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'accent-height', 'accumulate', 'additive', 'alignment-baseline', 'alphabetic',
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'ascent', 'attributename', 'attributetype', 'azimuth', 'basefrequency', 'baseprofile',
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'baseline-shift', 'begin', 'bias', 'by', 'clip', 'clip-path', 'clip-rule',
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'color', 'color-interpolation', 'color-interpolation-filters', 'color-profile',
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'color-rendering', 'cx', 'cy', 'd', 'dx', 'dy', 'diffuseconstant', 'direction',
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'display', 'divisor', 'dur', 'edgemode', 'elevation', 'end', 'fill', 'fill-opacity',
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'fill-rule', 'filter', 'flood-color', 'flood-opacity', 'font-family', 'font-size',
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'font-size-adjust', 'font-stretch', 'font-style', 'font-variant', 'font-weight', 'from',
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'fx', 'fy', 'g1', 'g2', 'glyph-name', 'glyphref', 'gradientunits', 'gradienttransform',
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'image-rendering', 'in', 'in2', 'k', 'k1', 'k2', 'k3', 'k4', 'kerning', 'keypoints',
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'keysplines', 'keytimes', 'lengthadjust', 'letter-spacing', 'kernelmatrix',
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'kernelunitlength', 'lighting-color', 'local', 'marker-end', 'marker-mid',
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'marker-start', 'markerheight', 'markerunits', 'markerwidth', 'maskcontentunits',
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'maskunits', 'max', 'mask', 'mode', 'min', 'numoctaves', 'offset', 'operator',
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'opacity', 'order', 'orient', 'orientation', 'origin', 'overflow', 'paint-order',
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'path', 'pathlength', 'patterncontentunits', 'patterntransform', 'patternunits',
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'points', 'preservealpha', 'r', 'rx', 'ry', 'radius', 'refx', 'refy', 'repeatcount',
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'repeatdur', 'restart', 'rotate', 'scale', 'seed', 'shape-rendering', 'show', 'specularconstant',
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'specularexponent', 'spreadmethod', 'stddeviation', 'stitchtiles', 'stop-color',
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'stop-opacity', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap',
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'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke', 'stroke-width',
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'surfacescale', 'targetx', 'targety', 'transform', 'text-anchor', 'text-decoration',
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'text-rendering', 'textlength', 'to', 'u1', 'u2', 'unicode', 'values', 'viewbox',
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'visibility', 'vert-adv-y', 'version', 'vert-origin-x', 'vert-origin-y', 'word-spacing',
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'wrap', 'writing-mode', 'xchannelselector', 'ychannelselector', 'x', 'x1', 'x2',
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'xmlns', 'y', 'y1', 'y2', 'z', 'zoomandpan',
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// MathML
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'accent', 'accentunder', 'bevelled', 'close', 'columnalign', 'columnlines',
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'columnspan', 'denomalign', 'depth', 'display', 'displaystyle', 'encoding', 'fence',
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'frame', 'largeop', 'length', 'linethickness', 'lspace', 'lquote',
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'mathbackground', 'mathcolor', 'mathsize', 'mathvariant', 'maxsize',
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'minsize', 'movablelimits', 'notation', 'numalign', 'open', 'rowalign',
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'rowlines', 'rowspacing', 'rowspan', 'rspace', 'rquote', 'scriptlevel',
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'scriptminsize', 'scriptsizemultiplier', 'selection', 'separator',
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'separators', 'stretchy', 'subscriptshift', 'supscriptshift', 'symmetric', 'voffset',
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'fontsize', 'fontweight', 'fontstyle', 'fontfamily', 'groupalign', 'edge', 'side',
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);
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/**
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* @var array Elements which could be empty and be returned in short form (<tag />)
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*/
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static $void_elements = array('area', 'base', 'br', 'col', 'command', 'embed', 'hr',
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'img', 'input', 'keygen', 'link', 'meta', 'param', 'source', 'track', 'wbr',
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// MathML
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'sep', 'infinity', 'in', 'plus', 'eq', 'power', 'times', 'divide', 'root',
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'maligngroup', 'none', 'mprescripts',
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);
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/**
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* @var array Additional allowed attributes of body element
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*/
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static $body_attribs = array('alink', 'background', 'bgcolor', 'link', 'text', 'vlink');
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/** @var bool State indicating existence of linked objects in HTML */
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public $extlinks = false;
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/** @var array Current settings */
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private $config = array();
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/** @var array Registered callback functions for tags */
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private $handlers = array();
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/** @var array Allowed HTML elements */
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private $_html_elements = array();
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/** @var array Ignore these HTML tags but process their content */
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private $_ignore_elements = array();
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/** @var array Elements which could be empty and be returned in short form (<tag />) */
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private $_void_elements = array();
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/** @var array Allowed HTML attributes */
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private $_html_attribs = array();
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/** @var string A prefix to be added to id/class/for attribute values */
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private $_css_prefix;
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/** @var int Max nesting level */
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private $max_nesting_level;
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/** @var bool True if current document is XML */
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private $is_xml = false;
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/**
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* Class constructor
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*
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* @param array $p Configuration options:
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* allow_remote: is a boolean to allow link to remote resources (images/css)
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* blocked_src: string with image-src to be used for blocked remote images
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* show_washed: is a boolean to include washed out attributes as x-washed
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* cid_map: is an array where cid urls index urls to replace them
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* charset: is a string containing the charset of the HTML document,
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* to be used if the charset is not defined in the document
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* css_prefix: A prefix to be added to id/class/for attribute values
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* html_elements: Additional allowed HTML elements
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* ignore_elements: Additional HTML elements to ignore
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* html_attribs: Additional allowed HTML attributes
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* void_elements: Elements which could be empty and be returned in short form (<tag />)
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*/
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public function __construct($p = array())
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{
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$this->_html_elements = array_flip((array)$p['html_elements']) + array_flip(self::$html_elements);
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$this->_html_attribs = array_flip((array)$p['html_attribs']) + array_flip(self::$html_attribs);
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$this->_ignore_elements = array_flip((array)$p['ignore_elements']) + array_flip(self::$ignore_elements);
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$this->_void_elements = array_flip((array)$p['void_elements']) + array_flip(self::$void_elements);
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$this->_css_prefix = is_string($p['css_prefix']) && strlen($p['css_prefix']) ? $p['css_prefix'] : null;
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unset($p['html_elements'], $p['html_attribs'], $p['ignore_elements'], $p['void_elements'], $p['css_prefix']);
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$this->config = $p + array('show_washed' => true, 'allow_remote' => false, 'cid_map' => array());
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}
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/**
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* Register a callback function for a certain tag
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*
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* @param string $tag HTML tag name
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* @param callback $callback Callback function
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*/
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public function add_callback($tag, $callback)
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{
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$this->handlers[$tag] = $callback;
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}
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/**
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* Check CSS style
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*
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* @param string $style CSS style
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*
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* @return string Washed CSS style
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*/
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private function wash_style($style)
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{
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$result = array();
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// Remove unwanted white-space characters so regular expressions below work better
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$style = preg_replace('/[\n\r\s\t]+/', ' ', $style);
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// Decode insecure character sequences
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$style = rcube_utils::xss_entity_decode($style);
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foreach (explode(';', $style) as $declaration) {
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if (preg_match('/^\s*([a-z\\\-]+)\s*:\s*(.*)\s*$/i', $declaration, $match)) {
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$cssid = $match[1];
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$str = $match[2];
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$value = '';
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foreach ($this->explode_style($str) as $val) {
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if (preg_match('/^url\(/i', $val)) {
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if (preg_match('/^url\(\s*[\'"]?([^\'"\)]*)[\'"]?\s*\)/iu', $val, $match)) {
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if ($url = $this->wash_uri($match[1])) {
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$value .= ' url(' . htmlspecialchars($url, ENT_QUOTES, $this->config['charset']) . ')';
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}
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}
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}
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else if (!preg_match('/^(behavior|expression)/i', $val)) {
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// Set position:fixed to position:absolute for security (#5264)
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if (!strcasecmp($cssid, 'position') && !strcasecmp($val, 'fixed')) {
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$val = 'absolute';
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}
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// whitelist ?
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$value .= ' ' . $val;
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// #1488535: Fix size units, so width:800 would be changed to width:800px
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if (preg_match('/^(left|right|top|bottom|width|height)/i', $cssid)
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&& preg_match('/^[0-9]+$/', $val)
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) {
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$value .= 'px';
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}
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}
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}
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if (isset($value[0])) {
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$result[] = $cssid . ':' . $value;
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}
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}
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}
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return implode('; ', $result);
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}
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/**
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* Take a node and return allowed attributes and check values
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*
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* @param DOMNode $node Document element
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*
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* @return string Washed element attributes
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*/
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private function wash_attribs($node)
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{
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$result = '';
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$washed = array();
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$additional_attribs = array();
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if ($node->nodeName == 'body') {
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$additional_attribs = self::$body_attribs;
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}
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foreach ($node->attributes as $name => $attr) {
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$key = strtolower($name);
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$value = $attr->nodeValue;
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if ($key == 'style' && ($style = $this->wash_style($value))) {
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// replace double quotes to prevent syntax error and XSS issues (#1490227)
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$result .= ' style="' . str_replace('"', '"', $style) . '"';
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}
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else if (isset($this->_html_attribs[$key]) || in_array($key, $additional_attribs)) {
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$value = trim($value);
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$out = null;
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// in SVG to/from attribs may contain anything, including URIs
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if ($key == 'to' || $key == 'from') {
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$key = strtolower($node->getAttribute('attributeName'));
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if ($key && !isset($this->_html_attribs[$key])) {
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$key = null;
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}
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}
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if ($this->is_image_attribute($node->nodeName, $key)) {
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$out = $this->wash_uri($value, true);
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}
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else if ($this->is_link_attribute($node->nodeName, $key)) {
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if (!preg_match('!^(javascript|vbscript|data:)!i', $value)
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&& preg_match('!^([a-z][a-z0-9.+-]+:|//|#).+!i', $value)
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) {
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$out = $value;
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}
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}
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else if ($this->is_funciri_attribute($node->nodeName, $key)) {
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if (preg_match('/^[a-z:]*url\(/i', $val)) {
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if (preg_match('/^([a-z:]*url)\(\s*[\'"]?([^\'"\)]*)[\'"]?\s*\)/iu', $value, $match)) {
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if ($url = $this->wash_uri($match[2])) {
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$result .= ' ' . $attr->nodeName . '="' . $match[1]
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. '(' . htmlspecialchars($url, ENT_QUOTES, $this->config['charset']) . ')'
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. substr($val, strlen($match[0])) . '"';
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continue;
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}
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}
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else {
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$out = $value;
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}
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}
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else {
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$out = $value;
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}
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}
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else if ($this->_css_prefix !== null && in_array($key, array('id', 'class', 'for'))) {
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$out = preg_replace('/(\S+)/', $this->_css_prefix . '\1', $value);
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}
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else if ($key) {
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$out = $value;
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}
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if ($out !== null && $out !== '') {
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$result .= ' ' . $attr->nodeName . '="' . htmlspecialchars($out, ENT_QUOTES | ENT_SUBSTITUTE, $this->config['charset']) . '"';
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}
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else if ($value) {
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$washed[] = htmlspecialchars($attr->nodeName, ENT_QUOTES, $this->config['charset']);
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}
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}
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else {
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$washed[] = htmlspecialchars($attr->nodeName, ENT_QUOTES, $this->config['charset']);
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}
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}
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if (!empty($washed) && $this->config['show_washed']) {
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$result .= ' x-washed="' . implode(' ', $washed) . '"';
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}
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return $result;
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}
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/**
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* Wash URI value
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*
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* @param string $uri URI
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* @param bool $blocked_source Block remote source
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* @param bool $is_image URI points to an image
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*
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* @return string Washed URI
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*/
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private function wash_uri($uri, $blocked_source = false, $is_image = true)
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{
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if (($src = $this->config['cid_map'][$uri])
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|| ($src = $this->config['cid_map'][$this->config['base_url'].$uri])
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) {
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return $src;
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}
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// allow url(#id) used in SVG
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if ($uri[0] == '#') {
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return $uri;
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}
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if (preg_match('/^(http|https|ftp):.+/i', $uri)) {
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if ($this->config['allow_remote']) {
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return $uri;
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}
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$this->extlinks = true;
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if ($is_image && $blocked_source && $this->config['blocked_src']) {
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return $this->config['blocked_src'];
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}
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}
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else if ($is_image && preg_match('/^data:image.+/i', $uri)) { // RFC2397
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return $uri;
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}
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}
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/**
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* Check it the tag/attribute may contain an URI
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*
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* @param string $tag Element name
|
|
* @param string $attr Attribute name
|
|
*
|
|
* @return bool True if attribute may contain an URI, False otherwise
|
|
*/
|
|
private function is_link_attribute($tag, $attr)
|
|
{
|
|
return ($tag == 'a' || $tag == 'area') && $attr == 'href';
|
|
}
|
|
|
|
/**
|
|
* Check it the tag/attribute may contain an image URI
|
|
*
|
|
* @param string $tag Element name
|
|
* @param string $attr Attribute name
|
|
*
|
|
* @return bool True if attribute may contain an image URI, False otherwise
|
|
*/
|
|
private function is_image_attribute($tag, $attr)
|
|
{
|
|
return $attr == 'background'
|
|
|| $attr == 'color-profile' // SVG
|
|
|| ($attr == 'poster' && $tag == 'video')
|
|
|| ($attr == 'src' && preg_match('/^(img|image|source|input|video|audio)$/i', $tag))
|
|
|| ($tag == 'image' && $attr == 'href'); // SVG
|
|
}
|
|
|
|
/**
|
|
* Check it the tag/attribute may contain a FUNCIRI value
|
|
*
|
|
* @param string $tag Element name
|
|
* @param string $attr Attribute name
|
|
*
|
|
* @return bool True if attribute may contain a FUNCIRI value, False otherwise
|
|
*/
|
|
private function is_funciri_attribute($tag, $attr)
|
|
{
|
|
return in_array($attr, array('fill', 'filter', 'stroke', 'marker-start',
|
|
'marker-end', 'marker-mid', 'clip-path', 'mask', 'cursor'));
|
|
}
|
|
|
|
/**
|
|
* The main loop that recurse on a node tree.
|
|
* It output only allowed tags with allowed attributes and allowed inline styles
|
|
*
|
|
* @param DOMNode $node HTML element
|
|
* @param int $level Recurrence level (safe initial value found empirically)
|
|
*
|
|
* @return string HTML content
|
|
*/
|
|
private function dumpHtml($node, $level = 20)
|
|
{
|
|
if (!$node->hasChildNodes()) {
|
|
return '';
|
|
}
|
|
|
|
$level++;
|
|
|
|
if ($this->max_nesting_level > 0 && $level == $this->max_nesting_level - 1) {
|
|
// log error message once
|
|
if (!$this->max_nesting_level_error) {
|
|
$this->max_nesting_level_error = true;
|
|
rcube::raise_error(array('code' => 500, 'type' => 'php',
|
|
'line' => __LINE__, 'file' => __FILE__,
|
|
'message' => "Maximum nesting level exceeded (xdebug.max_nesting_level={$this->max_nesting_level})"),
|
|
true, false);
|
|
}
|
|
|
|
return '<!-- ignored -->';
|
|
}
|
|
|
|
$node = $node->firstChild;
|
|
$dump = '';
|
|
|
|
do {
|
|
switch ($node->nodeType) {
|
|
case XML_ELEMENT_NODE: //Check element
|
|
$tagName = strtolower($node->nodeName);
|
|
|
|
if ($tagName == 'link') {
|
|
$uri = $this->wash_uri($node->getAttribute('href'), false, false);
|
|
if (!$uri) {
|
|
$dump .= '<!-- link ignored -->';
|
|
break;
|
|
}
|
|
|
|
$node->setAttribute('href', (string) $uri);
|
|
}
|
|
|
|
if ($callback = $this->handlers[$tagName]) {
|
|
$dump .= call_user_func($callback, $tagName,
|
|
$this->wash_attribs($node), $this->dumpHtml($node, $level), $this);
|
|
}
|
|
else if (isset($this->_html_elements[$tagName])) {
|
|
$content = $this->dumpHtml($node, $level);
|
|
$dump .= '<' . $node->nodeName;
|
|
|
|
if ($tagName == 'svg') {
|
|
$xpath = new DOMXPath($node->ownerDocument);
|
|
foreach ($xpath->query('namespace::*') as $ns) {
|
|
if ($ns->nodeName != 'xmlns:xml') {
|
|
$dump .= ' ' . $ns->nodeName . '="' . $ns->nodeValue . '"';
|
|
}
|
|
}
|
|
}
|
|
else if ($tagName == 'textarea' && strpos($content, '<') !== false) {
|
|
$content = htmlspecialchars($content, ENT_QUOTES | ENT_SUBSTITUTE, $this->config['charset']);
|
|
}
|
|
|
|
$dump .= $this->wash_attribs($node);
|
|
|
|
if ($content === '' && ($this->is_xml || isset($this->_void_elements[$tagName]))) {
|
|
$dump .= ' />';
|
|
}
|
|
else {
|
|
$dump .= '>' . $content . '</' . $node->nodeName . '>';
|
|
}
|
|
}
|
|
else if (isset($this->_ignore_elements[$tagName])) {
|
|
$dump .= '<!-- ' . htmlspecialchars($node->nodeName, ENT_QUOTES, $this->config['charset']) . ' not allowed -->';
|
|
}
|
|
else {
|
|
$dump .= '<!-- ' . htmlspecialchars($node->nodeName, ENT_QUOTES, $this->config['charset']) . ' ignored -->';
|
|
$dump .= $this->dumpHtml($node, $level); // ignore tags not its content
|
|
}
|
|
break;
|
|
|
|
case XML_CDATA_SECTION_NODE:
|
|
$dump .= $node->nodeValue;
|
|
break;
|
|
|
|
case XML_TEXT_NODE:
|
|
$dump .= htmlspecialchars($node->nodeValue, ENT_COMPAT | ENT_HTML401 | ENT_SUBSTITUTE, $this->config['charset']);
|
|
break;
|
|
|
|
case XML_HTML_DOCUMENT_NODE:
|
|
$dump .= $this->dumpHtml($node, $level);
|
|
break;
|
|
}
|
|
}
|
|
while($node = $node->nextSibling);
|
|
|
|
return $dump;
|
|
}
|
|
|
|
/**
|
|
* Main function, give it untrusted HTML, tell it if you allow loading
|
|
* remote images and give it a map to convert "cid:" urls.
|
|
*
|
|
* @param string $html HTML content
|
|
*
|
|
* @return string Washed HTML content
|
|
*/
|
|
public function wash($html)
|
|
{
|
|
$this->extlinks = false;
|
|
|
|
$html = $this->cleanup($html);
|
|
|
|
// Find base URL for images
|
|
if (preg_match('/<base\s+href=[\'"]*([^\'"]+)/is', $html, $matches)) {
|
|
$this->config['base_url'] = $matches[1];
|
|
}
|
|
else {
|
|
$this->config['base_url'] = '';
|
|
}
|
|
|
|
// Detect max nesting level (for dumpHTML) (#1489110)
|
|
$this->max_nesting_level = (int) @ini_get('xdebug.max_nesting_level');
|
|
|
|
// SVG need to be parsed as XML
|
|
$this->is_xml = stripos($html, '<html') === false && stripos($html, '<svg') !== false;
|
|
$method = $this->is_xml ? 'loadXML' : 'loadHTML';
|
|
|
|
// DOMDocument does not support HTML5, try Masterminds parser if available
|
|
if (!$this->is_xml && class_exists('Masterminds\HTML5')) {
|
|
try {
|
|
$html5 = new Masterminds\HTML5();
|
|
$node = $html5->loadHTML($this->fix_html5($html));
|
|
}
|
|
catch (Exception $e) {
|
|
// ignore, fallback to DOMDocument
|
|
}
|
|
}
|
|
|
|
if (empty($node)) {
|
|
// Charset seems to be ignored (probably if defined in the HTML document)
|
|
$node = new DOMDocument('1.0', $this->config['charset']);
|
|
@$node->{$method}($html, LIBXML_PARSEHUGE | LIBXML_COMPACT | LIBXML_NONET);
|
|
}
|
|
|
|
return $this->dumpHtml($node);
|
|
}
|
|
|
|
/**
|
|
* Getter for config parameters
|
|
*
|
|
* @param string $prop Configuration parameter name
|
|
*
|
|
* @return mixed Configuration parameter value
|
|
*/
|
|
public function get_config($prop)
|
|
{
|
|
return $this->config[$prop];
|
|
}
|
|
|
|
/**
|
|
* Clean HTML input
|
|
*
|
|
* @param string $html HTML content
|
|
*
|
|
* @return string Clean HTML content
|
|
*/
|
|
private function cleanup($html)
|
|
{
|
|
$html = trim($html);
|
|
|
|
// special replacements (not properly handled by washtml class)
|
|
$html_search = array(
|
|
// space(s) between <NOBR>
|
|
'/(<\/nobr>)(\s+)(<nobr>)/i',
|
|
// PHP bug #32547 workaround: remove title tag
|
|
'/<title[^>]*>[^<]*<\/title>/i',
|
|
// remove <!doctype> before BOM (#1490291)
|
|
'/<\!doctype[^>]+>[^<]*/im',
|
|
// byte-order mark (only outlook?)
|
|
'/^(\0\0\xFE\xFF|\xFF\xFE\0\0|\xFE\xFF|\xFF\xFE|\xEF\xBB\xBF)/',
|
|
// washtml/DOMDocument cannot handle xml namespaces
|
|
'/<html\s[^>]+>/i',
|
|
// washtml/DOMDocument cannot handle xml namespaces
|
|
'/<\?xml:namespace\s[^>]+>/i',
|
|
);
|
|
|
|
$html_replace = array(
|
|
'\\1'.' '.'\\3',
|
|
'',
|
|
'',
|
|
'',
|
|
'<html>',
|
|
'',
|
|
);
|
|
|
|
$html = preg_replace($html_search, $html_replace, $html);
|
|
|
|
$err = array('line' => __LINE__, 'file' => __FILE__, 'message' => "Could not clean up HTML!");
|
|
if ($html === null && rcube_utils::preg_error($err)) {
|
|
return '';
|
|
}
|
|
|
|
// Replace all of those weird MS Word quotes and other high characters
|
|
$badwordchars = array(
|
|
"\xe2\x80\x98", // left single quote
|
|
"\xe2\x80\x99", // right single quote
|
|
"\xe2\x80\x9c", // left double quote
|
|
"\xe2\x80\x9d", // right double quote
|
|
"\xe2\x80\x94", // em dash
|
|
"\xe2\x80\xa6" // elipses
|
|
);
|
|
|
|
$fixedwordchars = array(
|
|
"'",
|
|
"'",
|
|
'"',
|
|
'"',
|
|
'—',
|
|
'...'
|
|
);
|
|
|
|
$html = str_replace($badwordchars, $fixedwordchars, $html);
|
|
|
|
// FIXME: HTML comments handling could be better. The code below can break comments (#6464),
|
|
// we should probably do not modify content inside comments at all.
|
|
|
|
// fix (unknown/malformed) HTML tags before "wash"
|
|
$html = preg_replace_callback('/(<(?!\!)[\/]*)([^\s>]+)([^>]*)/', array($this, 'html_tag_callback'), $html);
|
|
|
|
// Remove invalid HTML comments (#1487759)
|
|
// Note: We don't want to remove valid comments, conditional comments
|
|
// and MSOutlook comments (<!-->)
|
|
$html = preg_replace('/<!--[a-zA-Z0-9]+>/', '', $html);
|
|
|
|
// fix broken nested lists
|
|
self::fix_broken_lists($html);
|
|
|
|
// turn relative into absolute urls
|
|
$html = self::resolve_base($html);
|
|
|
|
return $html;
|
|
}
|
|
|
|
/**
|
|
* Callback function for HTML tags fixing
|
|
*
|
|
* @param array $matches Matched elements (from preg_replace_callback())
|
|
*
|
|
* @return string Replacement string
|
|
*/
|
|
public static function html_tag_callback($matches)
|
|
{
|
|
// It might be an ending of a comment, ignore (#6464)
|
|
if (substr($matches[3], -2) == '--') {
|
|
$matches[0] = '';
|
|
return implode('', $matches);
|
|
}
|
|
|
|
$tagname = $matches[2];
|
|
$tagname = preg_replace(array(
|
|
'/:.*$/', // Microsoft's Smart Tags <st1:xxxx>
|
|
'/[^a-z0-9_\[\]\!?-]/i', // forbidden characters
|
|
), '', $tagname);
|
|
|
|
// fix invalid closing tags - remove any attributes (#1489446)
|
|
if ($matches[1] == '</') {
|
|
$matches[3] = '';
|
|
}
|
|
|
|
return $matches[1] . $tagname . $matches[3];
|
|
}
|
|
|
|
/**
|
|
* Convert all relative URLs according to a <base> in HTML
|
|
*
|
|
* @param string $body HTML body
|
|
*
|
|
* @return string HTML body
|
|
*/
|
|
public static function resolve_base($body)
|
|
{
|
|
// check for <base href=...>
|
|
if (preg_match('!(<base.*href=["\']?)([hftps]{3,5}://[a-z0-9/.%-]+)!i', $body, $regs)) {
|
|
$replacer = new rcube_base_replacer($regs[2]);
|
|
$body = $replacer->replace($body);
|
|
}
|
|
|
|
return $body;
|
|
}
|
|
|
|
/**
|
|
* Fix broken nested lists, they are not handled properly by DOMDocument (#1488768)
|
|
*
|
|
* @param string &$html HTML content
|
|
*/
|
|
public static function fix_broken_lists(&$html)
|
|
{
|
|
// do two rounds, one for <ol>, one for <ul>
|
|
foreach (array('ol', 'ul') as $tag) {
|
|
$pos = 0;
|
|
while (($pos = stripos($html, '<' . $tag, $pos)) !== false) {
|
|
$pos++;
|
|
|
|
// make sure this is an ol/ul tag
|
|
if (!in_array($html[$pos+2], array(' ', '>'))) {
|
|
continue;
|
|
}
|
|
|
|
$p = $pos;
|
|
$in_li = false;
|
|
$li_pos = 0;
|
|
|
|
while (($p = strpos($html, '<', $p)) !== false) {
|
|
$tt = strtolower(substr($html, $p, 4));
|
|
|
|
// li open tag
|
|
if ($tt == '<li>' || $tt == '<li ') {
|
|
$in_li = true;
|
|
$p += 4;
|
|
}
|
|
// li close tag
|
|
else if ($tt == '</li' && in_array($html[$p+4], array(' ', '>'))) {
|
|
$li_pos = $p;
|
|
$in_li = false;
|
|
$p += 4;
|
|
}
|
|
// ul/ol closing tag
|
|
else if ($tt == '</' . $tag && in_array($html[$p+4], array(' ', '>'))) {
|
|
break;
|
|
}
|
|
// nested ol/ul element out of li
|
|
else if (!$in_li && $li_pos && ($tt == '<ol>' || $tt == '<ol ' || $tt == '<ul>' || $tt == '<ul ')) {
|
|
// find closing tag of this ul/ol element
|
|
$element = substr($tt, 1, 2);
|
|
$cpos = $p;
|
|
do {
|
|
$tpos = stripos($html, '<' . $element, $cpos+1);
|
|
$cpos = stripos($html, '</' . $element, $cpos+1);
|
|
}
|
|
while ($tpos !== false && $cpos !== false && $cpos > $tpos);
|
|
|
|
// not found, this is invalid HTML, skip it
|
|
if ($cpos === false) {
|
|
break;
|
|
}
|
|
|
|
// get element content
|
|
$end = strpos($html, '>', $cpos);
|
|
$len = $end - $p + 1;
|
|
$element = substr($html, $p, $len);
|
|
|
|
// move element to the end of the last li
|
|
$html = substr_replace($html, '', $p, $len);
|
|
$html = substr_replace($html, $element, $li_pos, 0);
|
|
|
|
$p = $end;
|
|
}
|
|
else {
|
|
$p++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Cleanup and workarounds on input to Masterminds/HTML5
|
|
*
|
|
* @param string $html HTML content
|
|
*
|
|
* @return string HTML content
|
|
*/
|
|
protected function fix_html5($html)
|
|
{
|
|
// There might be content before html/body tag, we'll move it to the body
|
|
// We'll wrap it by a div container, it's an invalid HTML anyway
|
|
if (strpos($html, '<')) {
|
|
$pos = stripos($html, '<!DOCTYPE') ?: stripos($html, '<html') ?: stripos($html, '<body');
|
|
$prefix = '<div>' . substr($html, 0, $pos) . '</div>';
|
|
$html = substr($html, $pos);
|
|
}
|
|
|
|
// HTML5 requires <head> or <body> (#6713)
|
|
// https://github.com/Masterminds/html5-php/issues/166
|
|
if (isset($prefix) || !preg_match('/<(head|body)/i', $html)) {
|
|
$body_pos = stripos($html, '<body');
|
|
$pos = $body_pos !== false ? $body_pos : stripos($html, '<html');
|
|
|
|
// No HTML and no BODY tag
|
|
if ($pos === false) {
|
|
$html = '<html><body>' . $prefix . $html;
|
|
}
|
|
// Either HTML or BODY tag found
|
|
else {
|
|
$pos = strpos($html, '>', $pos);
|
|
$html = substr_replace($html, ($body_pos === false ? '<body>' : '') . $prefix, $pos + 1, 0);
|
|
}
|
|
}
|
|
|
|
return $html;
|
|
}
|
|
|
|
/**
|
|
* Explode css style value
|
|
*
|
|
* @param string $style CSS style
|
|
*
|
|
* @return array List of CSS rules
|
|
*/
|
|
protected function explode_style($style)
|
|
{
|
|
$pos = 0;
|
|
|
|
// first remove comments
|
|
while (($pos = strpos($style, '/*', $pos)) !== false) {
|
|
$end = strpos($style, '*/', $pos+2);
|
|
|
|
if ($end === false) {
|
|
$style = substr($style, 0, $pos);
|
|
}
|
|
else {
|
|
$style = substr_replace($style, '', $pos, $end - $pos + 2);
|
|
}
|
|
}
|
|
|
|
$style = trim($style);
|
|
$strlen = strlen($style);
|
|
$result = array();
|
|
|
|
// explode value
|
|
for ($p=$i=0; $i < $strlen; $i++) {
|
|
if (($style[$i] == "\"" || $style[$i] == "'") && $style[$i-1] != "\\") {
|
|
if ($q == $style[$i]) {
|
|
$q = false;
|
|
}
|
|
else if (!$q) {
|
|
$q = $style[$i];
|
|
}
|
|
}
|
|
|
|
if (!$q && $style[$i] == ' ' && !preg_match('/[,\(]/', $style[$i-1])) {
|
|
$result[] = substr($style, $p, $i - $p);
|
|
$p = $i + 1;
|
|
}
|
|
}
|
|
|
|
$result[] = (string) substr($style, $p);
|
|
|
|
return $result;
|
|
}
|
|
}
|