From 7a26038e66da9d958cc1cc439c904a6a7977428e Mon Sep 17 00:00:00 2001
From: mistic100 <mistic@piwigo.org>
Date: Tue, 5 Nov 2013 19:23:29 +0000
Subject: feature 2965: apply new template on pwg_mail() TODO : review other
 mail functions, configuration GUI

git-svn-id: http://piwigo.org/svn/trunk@25344 68402e56-0260-453c-a942-63ccdbb3a9ee
---
 include/emogrifier.class.php | 404 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 404 insertions(+)
 create mode 100644 include/emogrifier.class.php

(limited to 'include/emogrifier.class.php')

diff --git a/include/emogrifier.class.php b/include/emogrifier.class.php
new file mode 100644
index 000000000..ef2c49730
--- /dev/null
+++ b/include/emogrifier.class.php
@@ -0,0 +1,404 @@
+<?php
+/*
+UPDATES
+
+    2008-08-10  Fixed CSS comment stripping regex to add PCRE_DOTALL (changed from '/\/\*.*\*\//U' to '/\/\*.*\*\//sU')
+    2008-08-18  Added lines instructing DOMDocument to attempt to normalize HTML before processing
+    2008-10-20  Fixed bug with bad variable name... Thanks Thomas!
+    2008-03-02  Added licensing terms under the MIT License
+                Only remove unprocessable HTML tags if they exist in the array
+    2009-06-03  Normalize existing CSS (style) attributes in the HTML before we process the CSS.
+                Made it so that the display:none stripper doesn't require a trailing semi-colon.
+    2009-08-13  Added support for subset class values (e.g. "p.class1.class2").
+                Added better protection for bad css attributes.
+                Fixed support for HTML entities.
+    2009-08-17  Fixed CSS selector processing so that selectors are processed by precedence/specificity, and not just in order.
+    2009-10-29  Fixed so that selectors appearing later in the CSS will have precedence over identical selectors appearing earlier.
+    2009-11-04  Explicitly declared static functions static to get rid of E_STRICT notices.
+    2010-05-18  Fixed bug where full url filenames with protocols wouldn't get split improperly when we explode on ':'... Thanks Mark!
+                Added two new attribute selectors
+    2010-06-16  Added static caching for less processing overhead in situations where multiple emogrification takes place
+    2010-07-26  Fixed bug where '0' values were getting discarded because of php's empty() function... Thanks Scott!
+    2010-09-03  Added checks to invisible node removal to ensure that we don't try to remove non-existent child nodes of parents that have already been deleted
+    2011-04-08  Fixed errors in CSS->XPath conversion for adjacent sibling selectors and id/class combinations... Thanks Bob V.!
+    2011-06-08  Fixed an error where CSS @media types weren't being parsed correctly... Thanks Will W.!
+    2011-08-03  Fixed an error where an empty selector at the beginning of the CSS would cause a parse error on the next selector... Thanks Alexei T.!
+    2011-10-13  Fully fixed a bug introduced in 2011-06-08 where selectors at the beginning of the CSS would be parsed incorrectly... Thanks Thomas A.!
+    2011-10-26  Added an option to allow you to output emogrified code without extended characters being turned into HTML entities.
+                Moved static references to class attributes so they can be manipulated.
+                Added the ability to clear out the (formerly) static cache when CSS is reloaded.
+    2011-12-22  Fixed a bug that was overwriting existing inline styles from the original HTML... Thanks Sagi L.!
+    2012-01-31  Fixed a bug that was introduced with the 2011-12-22 revision... Thanks Sagi L. and M. Bąkowski!
+                Added extraction of <style> blocks within the HTML due to popular demand.
+                Added several new pseudo-selectors (first-child, last-child, nth-child, and nth-of-type).
+    2012-02-07  Fixed some recent code introductions to use class constants rather than global constants.
+                Fixed some recent code introductions to make it cleaner to read.
+    2012-05-01  Made removal of invisible nodes operate in a case-insensitive manner... Thanks Juha P.!
+    2013-10-10  Add preserveStyleTag option
+*/
+
+define('CACHE_CSS', 0);
+define('CACHE_SELECTOR', 1);
+define('CACHE_XPATH', 2);
+
+class Emogrifier {
+
+    // for calculating nth-of-type and nth-child selectors
+    const INDEX = 0;
+    const MULTIPLIER = 1;
+
+    private $html = '';
+    private $css = '';
+    private $unprocessableHTMLTags = array('wbr');
+    private $caches = array();
+
+    // this attribute applies to the case where you want to preserve your original text encoding.
+    // by default, emogrifier translates your text into HTML entities for two reasons:
+    // 1. because of client incompatibilities, it is better practice to send out HTML entities rather than unicode over email
+    // 2. it translates any illegal XML characters that DOMDocument cannot work with
+    // if you would like to preserve your original encoding, set this attribute to true.
+    public $preserveEncoding = false;
+    
+    // by default, emogrifier removes <style> tags, set preserveStyleTag to true to keep them
+    public $preserveStyleTag = false;
+
+    public function __construct($html = '', $css = '') {
+        $this->html = $html;
+        $this->css  = $css;
+        $this->clearCache();
+    }
+
+    public function setHTML($html = '') { $this->html = $html; }
+    public function setCSS($css = '') {
+        $this->css = $css;
+        $this->clearCache(CACHE_CSS);
+    }
+
+    public function clearCache($key = null) {
+        if (!is_null($key)) {
+            if (isset($this->caches[$key])) $this->caches[$key] = array();
+        } else {
+            $this->caches = array(
+                CACHE_CSS       => array(),
+                CACHE_SELECTOR  => array(),
+                CACHE_XPATH     => array(),
+            );
+        }
+    }
+
+    // there are some HTML tags that DOMDocument cannot process, and will throw an error if it encounters them.
+    // in particular, DOMDocument will complain if you try to use HTML5 tags in an XHTML document.
+    // these functions allow you to add/remove them if necessary.
+    // it only strips them from the code (does not remove actual nodes).
+    public function addUnprocessableHTMLTag($tag) { $this->unprocessableHTMLTags[] = $tag; }
+    public function removeUnprocessableHTMLTag($tag) {
+        if (($key = array_search($tag,$this->unprocessableHTMLTags)) !== false)
+            unset($this->unprocessableHTMLTags[$key]);
+    }
+
+    // applies the CSS you submit to the html you submit. places the css inline
+    public function emogrify() {
+        $body = $this->html;
+
+        // remove any unprocessable HTML tags (tags that DOMDocument cannot parse; this includes wbr and many new HTML5 tags)
+        if (count($this->unprocessableHTMLTags)) {
+            $unprocessableHTMLTags = implode('|',$this->unprocessableHTMLTags);
+            $body = preg_replace("/<\/?($unprocessableHTMLTags)[^>]*>/i",'',$body);
+        }
+
+        $encoding = mb_detect_encoding($body);
+        $body = mb_convert_encoding($body, 'HTML-ENTITIES', $encoding);
+
+        $xmldoc = new DOMDocument;
+        $xmldoc->encoding = $encoding;
+        $xmldoc->strictErrorChecking = false;
+        $xmldoc->formatOutput = true;
+        $xmldoc->loadHTML($body);
+        $xmldoc->normalizeDocument();
+
+        $xpath = new DOMXPath($xmldoc);
+
+        // before be begin processing the CSS file, parse the document and normalize all existing CSS attributes (changes 'DISPLAY: none' to 'display: none');
+        // we wouldn't have to do this if DOMXPath supported XPath 2.0.
+        // also store a reference of nodes with existing inline styles so we don't overwrite them
+        $vistedNodes = $vistedNodeRef = array();
+        $nodes = @$xpath->query('//*[@style]');
+        foreach ($nodes as $node) {
+            $normalizedOrigStyle = preg_replace('/[A-z\-]+(?=\:)/Se',"strtolower('\\0')", $node->getAttribute('style'));
+
+            // in order to not overwrite existing style attributes in the HTML, we have to save the original HTML styles
+            $nodeKey = md5($node->getNodePath());
+            if (!isset($vistedNodeRef[$nodeKey])) {
+                $vistedNodeRef[$nodeKey] = $this->cssStyleDefinitionToArray($normalizedOrigStyle);
+                $vistedNodes[$nodeKey]   = $node;
+            }
+
+            $node->setAttribute('style', $normalizedOrigStyle);
+        }
+
+        // grab any existing style blocks from the html and append them to the existing CSS
+        // (these blocks should be appended so as to have precedence over conflicting styles in the existing CSS)
+        $css = $this->css;
+        $nodes = @$xpath->query('//style');
+        foreach ($nodes as $node) {
+            // append the css
+            $css .= "\n\n{$node->nodeValue}";
+            // remove the <style> node
+            if (!$this->preserveStyleTag) {
+                $node->parentNode->removeChild($node);
+            }
+        }
+
+        // filter the CSS
+        $search = array(
+            '/\/\*.*\*\//sU', // get rid of css comment code
+            '/^\s*@import\s[^;]+;/misU', // strip out any import directives
+            '/^\s*@media\s[^{]+{\s*}/misU', // strip any empty media enclosures
+            '/^\s*@media\s+((aural|braille|embossed|handheld|print|projection|speech|tty|tv)\s*,*\s*)+{.*}\s*}/misU', // strip out all media types that are not 'screen' or 'all' (these don't apply to email)
+            '/^\s*@media\s[^{]+{(.*})\s*}/misU', // get rid of remaining media type enclosures
+        );
+
+        $replace = array(
+            '',
+            '',
+            '',
+            '',
+            '\\1',
+        );
+
+        $css = preg_replace($search, $replace, $css);
+
+        $csskey = md5($css);
+        if (!isset($this->caches[CACHE_CSS][$csskey])) {
+
+            // process the CSS file for selectors and definitions
+            preg_match_all('/(^|[^{}])\s*([^{]+){([^}]*)}/mis', $css, $matches, PREG_SET_ORDER);
+
+            $all_selectors = array();
+            foreach ($matches as $key => $selectorString) {
+                // if there is a blank definition, skip
+                if (!strlen(trim($selectorString[3]))) continue;
+
+                // else split by commas and duplicate attributes so we can sort by selector precedence
+                $selectors = explode(',',$selectorString[2]);
+                foreach ($selectors as $selector) {
+
+                    // don't process pseudo-elements and behavioral (dynamic) pseudo-classes; ONLY allow structural pseudo-classes
+                    if (strpos($selector, ':') !== false && !preg_match('/:\S+\-(child|type)\(/i', $selector)) continue;
+
+                    $all_selectors[] = array('selector' => trim($selector),
+                                             'attributes' => trim($selectorString[3]),
+                                             'line' => $key, // keep track of where it appears in the file, since order is important
+                    );
+                }
+            }
+
+            // now sort the selectors by precedence
+            usort($all_selectors, array($this,'sortBySelectorPrecedence'));
+
+            $this->caches[CACHE_CSS][$csskey] = $all_selectors;
+        }
+
+        foreach ($this->caches[CACHE_CSS][$csskey] as $value) {
+
+            // query the body for the xpath selector
+            $nodes = $xpath->query($this->translateCSStoXpath(trim($value['selector'])));
+
+            foreach($nodes as $node) {
+                // if it has a style attribute, get it, process it, and append (overwrite) new stuff
+                if ($node->hasAttribute('style')) {
+                    // break it up into an associative array
+                    $oldStyleArr = $this->cssStyleDefinitionToArray($node->getAttribute('style'));
+                    $newStyleArr = $this->cssStyleDefinitionToArray($value['attributes']);
+
+                    // new styles overwrite the old styles (not technically accurate, but close enough)
+                    $combinedArr = array_merge($oldStyleArr,$newStyleArr);
+                    $style = '';
+                    foreach ($combinedArr as $k => $v) $style .= (strtolower($k) . ':' . $v . ';');
+                } else {
+                    // otherwise create a new style
+                    $style = trim($value['attributes']);
+                }
+                $node->setAttribute('style', $style);
+            }
+        }
+
+        // now iterate through the nodes that contained inline styles in the original HTML
+        foreach ($vistedNodeRef as $nodeKey => $origStyleArr) {
+            $node = $vistedNodes[$nodeKey];
+            $currStyleArr = $this->cssStyleDefinitionToArray($node->getAttribute('style'));
+
+            $combinedArr = array_merge($currStyleArr, $origStyleArr);
+            $style = '';
+            foreach ($combinedArr as $k => $v) $style .= (strtolower($k) . ':' . $v . ';');
+
+            $node->setAttribute('style', $style);
+        }
+
+        // This removes styles from your email that contain display:none.
+        // We need to look for display:none, but we need to do a case-insensitive search. Since DOMDocument only supports XPath 1.0,
+        // lower-case() isn't available to us. We've thus far only set attributes to lowercase, not attribute values. Consequently, we need
+        // to translate() the letters that would be in 'NONE' ("NOE") to lowercase.
+        $nodes = $xpath->query('//*[contains(translate(translate(@style," ",""),"NOE","noe"),"display:none")]');
+        // The checks on parentNode and is_callable below ensure that if we've deleted the parent node,
+        // we don't try to call removeChild on a nonexistent child node
+        if ($nodes->length > 0)
+            foreach ($nodes as $node)
+                if ($node->parentNode && is_callable(array($node->parentNode,'removeChild')))
+                        $node->parentNode->removeChild($node);
+
+        if ($this->preserveEncoding) {
+            return mb_convert_encoding($xmldoc->saveHTML(), $encoding, 'HTML-ENTITIES');
+        } else {
+            return $xmldoc->saveHTML();
+        }
+    }
+
+    private function sortBySelectorPrecedence($a, $b) {
+        $precedenceA = $this->getCSSSelectorPrecedence($a['selector']);
+        $precedenceB = $this->getCSSSelectorPrecedence($b['selector']);
+
+        // we want these sorted ascendingly so selectors with lesser precedence get processed first and
+        // selectors with greater precedence get sorted last
+        return ($precedenceA == $precedenceB) ? ($a['line'] < $b['line'] ? -1 : 1) : ($precedenceA < $precedenceB ? -1 : 1);
+    }
+
+    private function getCSSSelectorPrecedence($selector) {
+        $selectorkey = md5($selector);
+        if (!isset($this->caches[CACHE_SELECTOR][$selectorkey])) {
+            $precedence = 0;
+            $value = 100;
+            $search = array('\#','\.',''); // ids: worth 100, classes: worth 10, elements: worth 1
+
+            foreach ($search as $s) {
+                if (trim($selector == '')) break;
+                $num = 0;
+                $selector = preg_replace('/'.$s.'\w+/','',$selector,-1,$num);
+                $precedence += ($value * $num);
+                $value /= 10;
+            }
+            $this->caches[CACHE_SELECTOR][$selectorkey] = $precedence;
+        }
+
+        return $this->caches[CACHE_SELECTOR][$selectorkey];
+    }
+
+    // right now we support all CSS 1 selectors and most CSS2/3 selectors.
+    // http://plasmasturm.org/log/444/
+    private function translateCSStoXpath($css_selector) {
+
+        $css_selector = trim($css_selector);
+        $xpathkey = md5($css_selector);
+        if (!isset($this->caches[CACHE_XPATH][$xpathkey])) {
+            // returns an Xpath selector
+            $search = array(
+                               '/\s+>\s+/', // Matches any element that is a child of parent.
+                               '/\s+\+\s+/', // Matches any element that is an adjacent sibling.
+                               '/\s+/', // Matches any element that is a descendant of an parent element element.
+                               '/([^\/]+):first-child/i', // first-child pseudo-selector
+                               '/([^\/]+):last-child/i', // last-child pseudo-selector
+                               '/(\w)\[(\w+)\]/', // Matches element with attribute
+                               '/(\w)\[(\w+)\=[\'"]?(\w+)[\'"]?\]/', // Matches element with EXACT attribute
+                               '/(\w+)?\#([\w\-]+)/e', // Matches id attributes
+                               '/(\w+|[\*\]])?((\.[\w\-]+)+)/e', // Matches class attributes
+
+            );
+            $replace = array(
+                               '/',
+                               '/following-sibling::*[1]/self::',
+                               '//',
+                               '*[1]/self::\\1',
+                               '*[last()]/self::\\1',
+                               '\\1[@\\2]',
+                               '\\1[@\\2="\\3"]',
+                               "(strlen('\\1') ? '\\1' : '*').'[@id=\"\\2\"]'",
+                               "(strlen('\\1') ? '\\1' : '*').'[contains(concat(\" \",@class,\" \"),concat(\" \",\"'.implode('\",\" \"))][contains(concat(\" \",@class,\" \"),concat(\" \",\"',explode('.',substr('\\2',1))).'\",\" \"))]'",
+            );
+
+            $css_selector = '//'.preg_replace($search, $replace, $css_selector);
+
+            // advanced selectors are going to require a bit more advanced emogrification
+            // if we required PHP 5.3 we could do this with closures
+            $css_selector = preg_replace_callback('/([^\/]+):nth-child\(\s*(odd|even|[+\-]?\d|[+\-]?\d?n(\s*[+\-]\s*\d)?)\s*\)/i', array($this, 'translateNthChild'), $css_selector);
+            $css_selector = preg_replace_callback('/([^\/]+):nth-of-type\(\s*(odd|even|[+\-]?\d|[+\-]?\d?n(\s*[+\-]\s*\d)?)\s*\)/i', array($this, 'translateNthOfType'), $css_selector);
+
+            $this->caches[CACHE_SELECTOR][$xpathkey] = $css_selector;
+        }
+        return $this->caches[CACHE_SELECTOR][$xpathkey];
+    }
+
+    private function translateNthChild($match) {
+
+        $result = $this->parseNth($match);
+
+        if (isset($result[self::MULTIPLIER])) {
+            if ($result[self::MULTIPLIER] < 0) {
+                $result[self::MULTIPLIER] = abs($result[self::MULTIPLIER]);
+                return sprintf("*[(last() - position()) mod %u = %u]/self::%s", $result[self::MULTIPLIER], $result[self::INDEX], $match[1]);
+            } else {
+                return sprintf("*[position() mod %u = %u]/self::%s", $result[self::MULTIPLIER], $result[self::INDEX], $match[1]);
+            }
+        } else {
+            return sprintf("*[%u]/self::%s", $result[self::INDEX], $match[1]);
+        }
+    }
+
+    private function translateNthOfType($match) {
+
+        $result = $this->parseNth($match);
+
+        if (isset($result[self::MULTIPLIER])) {
+            if ($result[self::MULTIPLIER] < 0) {
+                $result[self::MULTIPLIER] = abs($result[self::MULTIPLIER]);
+                return sprintf("%s[(last() - position()) mod %u = %u]", $match[1], $result[self::MULTIPLIER], $result[self::INDEX]);
+            } else {
+                return sprintf("%s[position() mod %u = %u]", $match[1], $result[self::MULTIPLIER], $result[self::INDEX]);
+            }
+        } else {
+            return sprintf("%s[%u]", $match[1], $result[self::INDEX]);
+        }
+    }
+
+    private function parseNth($match) {
+
+        if (in_array(strtolower($match[2]), array('even','odd'))) {
+            $index = strtolower($match[2]) == 'even' ? 0 : 1;
+            return array(self::MULTIPLIER => 2, self::INDEX => $index);
+        // if there is a multiplier
+        } else if (stripos($match[2], 'n') === false) {
+            $index = intval(str_replace(' ', '', $match[2]));
+            return array(self::INDEX => $index);
+        } else {
+
+            if (isset($match[3])) {
+                $multiple_term = str_replace($match[3], '', $match[2]);
+                $index = intval(str_replace(' ', '', $match[3]));
+            } else {
+                $multiple_term = $match[2];
+                $index = 0;
+            }
+
+            $multiplier = str_ireplace('n', '', $multiple_term);
+
+            if (!strlen($multiplier)) $multiplier = 1;
+            elseif ($multiplier == 0) return array(self::INDEX => $index);
+            else $multiplier = intval($multiplier);
+
+            while ($index < 0) $index += abs($multiplier);
+
+            return array(self::MULTIPLIER => $multiplier, self::INDEX => $index);
+        }
+    }
+
+    private function cssStyleDefinitionToArray($style) {
+        $definitions = explode(';',$style);
+        $retArr = array();
+        foreach ($definitions as $def) {
+            if (empty($def) || strpos($def, ':') === false) continue;
+            list($key,$value) = explode(':',$def,2);
+            if (empty($key) || strlen(trim($value)) === 0) continue;
+            $retArr[trim($key)] = trim($value);
+        }
+        return $retArr;
+    }
+}
\ No newline at end of file
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