bayareawebpro/laravel-dom-pipeline

A DOM Pipeline Utility for Modifying HTML

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github.com/bayareawebpro/laravel-dom-pipeline

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v1.0.7 2023-03-27 22:52 UTC

Requires

Requires (Dev)

MIT 8a7244a0ad40d315d7c96a544b20d81b02da5026

  • Dan Alvidrez <dan.bayareawebpro.woop@gmail.com>

bayareawebprolaravel-dom-pipeline

This package is auto-updated.

Last update: 2024-10-28 02:40:56 UTC

README

composer require bayareawebpro/laravel-dom-pipeline

https://packagist.org/packages/bayareawebpro/laravel-dom-pipeline

Laravel DOM Pipeline allows you to pipe HTML content through a series of classes which can be helpful with sanitization and server-side enhancement / modification of page elements. The pipeline will not return the <body> tag or any other tags outside of the body scope.

"libxml_use_internal_errors" is enabled allow any type of tag to operated on. See DomPipelineService::class (line 25).

Usage:

use BayAreaWebPro\DomPipeline\DomPipeline;
use My\Pipes\{
    LazyLoadImageTags,
    LazyLoadVideoTags,
    BuildTableOfContents
};

$modified = DomPipeline::make($html, [
    LazyLoadImageTags::class,
    LazyLoadVideoTags::class,
    BuildTableOfContents::class,
]);

Example Dom Pipe Class

Docs: https://www.php.net/manual/en/book.dom.php

use DOMDocument;
use DOMXPath;
use Closure;

class UpdateHeaders{
    public function handle(DOMDocument $dom, Closure $next)
    {
        $xpath = new DOMXPath($dom);
        foreach ($xpath->query('//h1|//h2|//h3|//h4|//h5|//h6') as $node) {
            // Change the header tags content.
            $node->nodeValue = "This is a {$node->tagName} tag.";
        }
        return $next($dom);
    }
}

LazyLoad Images

<?php declare(strict_types=1);

namespace App\Services\Html\Formatters;

use Closure;
use DOMElement;
use DOMDocument;

class LazyLoadImages
{
    /**
     * @param DOMDocument $dom
     * @param Closure $next
     * @return mixed
     */
    public function handle(DOMDocument $dom, Closure $next)
    {
        foreach ($dom->getElementsByTagName('img') as $node) {
            $this->lazyLoad($node);
        }
        return $next($dom);
    }

    /**
     * @param DOMDocument $dom
     * @param DOMElement $node
     */
    protected function lazyLoad(DOMElement $node): void
    {
        if (!$node->hasAttribute('data-src')) {
            // Set the data-src attribute.
            $node->setAttribute('data-src', $node->getAttribute('src'));

            // Set the src attribute to loading image.
            $node->setAttribute('src', asset('images/loading.gif'));

            // Merge the lazy load class into the class list.
            $node->setAttribute('class',join(' ', [
                $node->getAttribute('class'),
                'lazy-load'
            ]));
        }
    }
}

Element to VueComponent

Convert an Iframe into a Vue Component extracting the video ID from the URL.

<?php declare(strict_types=1);

namespace App\Services\Html\Formatters;

use Closure;
use DOMElement;
use DOMDocument;

class LazyLoadVideos
{
    /**
     * @param DOMDocument $dom
     * @param Closure $next
     * @return mixed
     */
    public function handle(DOMDocument $dom, Closure $next)
    {
        $xpath = new \DOMXPath($dom);
        foreach($xpath->query('//iframe[@class="media"]') as $node){
            $this->lazyLoad($dom, $node);
        }
        return $next($dom);
    }

    /**
     * @param DOMDocument $dom
     * @param DOMElement $node
     */
    protected function lazyLoad(DOMDocument $dom, DOMElement $node): void
    {
        if(is_null($node->parentNode)) return;

        // Match the YouTube Video ID.
        // https://stackoverflow.com/questions/2936467/parse-youtube-video-id-using-preg-match
        preg_match('%(?:youtube(?:-nocookie)?\.com/(?:[^/]+/.+/|(?:v|e(?:mbed)?)/|.*[?&]v=)|youtu\.be/)([^"&?/ ]{11})%i',
            (string) $node->getAttribute('src'), $matches
        );

        if(isset($matches[1])){
            // Create a new HTML fragment.
            $fragment = $dom->createDocumentFragment();
            $fragment->appendXML(<<<HTML
            <v-video id="$matches[1]" label="Click to play..." :show-image="true"></v-video>
            HTML);

            // Replace Self with Fragment.
            $node->parentNode->replaceChild($fragment, $node);
        }
    }
}

Table of Contents

<?php declare(strict_types=1);

namespace App\Services\Html\Formatters;

use DOMElement;
use Closure;
use StdClass;
use DOMDocument;

use Illuminate\Support\Str;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\View;

class TableOfContents
{
    /**
     * @param DOMDocument $dom
     * @param Closure $next
     * @return mixed
     */
    public function handle(DOMDocument $dom, Closure $next)
    {
        $nodes = Collection::make();
        $xpath = new \DOMXPath($dom);

        foreach ($xpath->query('//h1|//h2|//h3|//h4|//h5|//h6') as $node) {
            $text = strip_tags(html_entity_decode((string) $node->nodeValue));
            $nodes->push($this->makeBookmark($node, $text));
        }

        if($nodes->count() > 5){
            View::share('tableOfContents', $nodes->take(25));
        }

        return $next($dom);
    }

    /**
     * @param DOMElement $node
     * @param string $text
     * @return StdClass
     */
    protected function makeBookmark(DOMElement $node, string $text): StdClass
    {
        // Create the bookmark item.
        $bookmark = (object)[
          'anchor' => Str::slug($text),
          'text'   => Str::title(Str::replaceLast('.', '', $text)),
        ];

        // Link the bookmark to the header using the ID.
        $node->setAttribute('id', $bookmark->anchor);

        return $bookmark;
    }
}

Make Tables Responsive

Convert tables to bootstrap equivalent style.

<?php declare(strict_types=1);

namespace App\Services\Html\Formatters;

use Closure;
use DOMElement;
use DOMDocument;

class Tables
{
    /**
     * @param DOMDocument $dom
     * @param \Closure $next
     * @return mixed
     */
    public function handle(DOMDocument $dom, Closure $next)
    {
        $xpath = new \DOMXPath($dom);
        foreach($xpath->query('//table') as $node){
            $this->makeResponsive($dom, $node);
        }
        return $next($dom);
    }

    /**
     * Wrap Responsive
     * @param DOMDocument $dom
     * @param DOMElement $node
     */
    protected function makeResponsive(DOMDocument $dom, DOMElement $node): void
    {            
        if(is_null($node->parentNode)) return;
        
        // Create the wrapper element.
        $div = $dom->createElement('div');

        // Apply classes to the element.
        $div->setAttribute('class','table table-responsive table-striped table-hover');

        // Clone and append the table to the element.
        $div->appendChild($node->cloneNode(true));

        // Swap the table for the new wrapped version.
        $node->parentNode->replaceChild($div,$node);
    }
}

Link Sanitizer

<?php declare(strict_types=1);

namespace App\Services\Html\Sanitizers;

use Illuminate\Support\Str;
use DOMDocument;
use DOMElement;
use Closure;

class Links
{
    protected array $internalHosts = [
        '//site.com',
        '//www.site.com',
        '//www.site.test',
        '//staging.site.com',
    ];

    protected array $protocols = [
        "https://",
        "http://",
        "//",
    ];

    protected array $mailable = [
        "@username",
        "mailto:",
    ];

    protected array $blackList = [
        "target",
        "rel",
    ];

    protected array $invalid = [
        '#',
    ];

    public function handle(DOMDocument $dom, Closure $next)
    {
        foreach($dom->getElementsByTagName('a') as $node){
            $this->removeBlacklistedAttributes($node);
            if ($this->isInvalidNode($node)) {
                $this->unwrapNode($node);
            } elseif ($this->isTelLink($node)) {
                $this->formatTelLink($node);
            } elseif ($this->isMailable($node)) {
                $this->formatMailable($node);
            } elseif ($this->isExternal($node)) {
                $this->formatExternalLink($node);
            } elseif ($this->isHomePage($node)) {
                $this->formatHomepage($node);
            } else {
                $this->formatInternalLink($node);
            }
        }

        return $next($dom);
    }

    protected function formatExternalLink(DOMElement $node): void
    {
        $node->setAttribute('target', '_blank');
        $node->setAttribute('title', $this->makeTitleFromHost($node->getAttribute('href')));
        $node->setAttribute('href', $this->fixProtocol($node->getAttribute('href')));
    }

    protected function formatMailable(DOMElement $node): void
    {
        if(!$node->hasAttribute('title')){

            $email = $this->condenseValue(
                str_replace('mailto:', '', (string)$node->getAttribute('href'))
            );

            $node->setAttribute('title', "Send an Email to {$email}");
        }
    }

    protected function formatHomepage(DOMElement $node): void
    {
        $node->setAttribute('href', "/");
        $node->setAttribute('title', config('app.name'));
    }

    protected function formatInternalLink(DOMElement $node): void
    {
        $slug = $this->toLowerCaseSlug($node->getAttribute('href'));

        $node->setAttribute('href', "/$slug");

        if (!$node->hasAttribute('title')) {
            $node->setAttribute('title',
                $this->makeTitleFromUrl($node->getAttribute('href'))
            );
        }
    }

    protected function formatTelLink(DOMElement $node): void
    {
        $formatted = $this->filterNumeric($node->getAttribute('href'));

        if (empty($formatted)) {
            $this->unwrapNode($node);
            return;
        }

        if(!Str::startsWith($formatted, ['+'])){
            $formatted = "+$formatted";
        }

        $node->setAttribute('href', "tel:{$formatted}");

        if (!$node->hasAttribute('title')) {
            $node->setAttribute('title', "Call {$formatted}");
        }
    }

    protected function unwrapNode(DOMElement $node): void
    {
        $node->nodeValue = strip_tags($node->nodeValue);
    }

    protected function removeBlacklistedAttributes(DOMElement $node): void
    {
        foreach ($this->blackList as $attribute) {
            $node->removeAttribute($attribute);
        }
    }

    protected function isInvalidNode(DOMElement $node): bool
    {
        $href = $node->getAttribute('href');
        return empty($href) || in_array($this->condenseValue($href), $this->invalid);
    }

    protected function condenseValue($value): string
    {
        return trim((string)$value);
    }

    protected function isTelLink(DOMElement $node): bool
    {
        return Str::startsWith($this->condenseValue($node->getAttribute('href')), ['tel:', '+']);
    }

    protected function isExternal(DOMElement $node): bool
    {
        return !Str::contains($node->getAttribute('href'), $this->internalHosts) &&
            Str::startsWith($node->getAttribute('href'), $this->protocols);
    }

    protected function isMailable(DOMElement $node): bool
    {
        return Str::contains($node->getAttribute('href'), $this->mailable);
    }

    protected function isHomePage(DOMElement $node): bool
    {
        return (
            in_array($this->condenseValue($node->getAttribute('href')), ['/']) ||
            in_array(trim((string)$node->getAttribute('title')), [config('app.name')]) ||
            Str::contains((string)$node->getAttribute('href'), $this->internalHosts)
        );
    }

    protected function safelyParsePath($original): string
    {
        return (string)parse_url((string)$original, PHP_URL_PATH);
    }

    protected function safelyParseHost($original): string
    {
        return (string)parse_url((string)$original, PHP_URL_HOST);
    }

    protected function toLowerCaseSlug($url): string
    {
        return str_replace('_', '-',
            Str::lower(trim($this->safelyParsePath($url), '/'))
        );
    }

    protected function hasInvalidProtocol($url): bool 
    {
        return Str::startsWith((string)$url, ['//']);
    }

    protected function fixProtocol($url): string
    {
        if ($this->hasInvalidProtocol($url)) {
            return "http:$url";
        }
        return $url;
    }

    protected function makeTitleFromUrl($url): string
    {
        return trim(Str::title($this->filterAlphaNumeric($url)));
    }

    protected function filterAlphaNumeric($url){
        return preg_replace('/[^a-zA-Z0-9]/', ' ', (string)$url);
    }

    protected function filterNumeric($url){
        return preg_replace('/[^0-9-+]/', '', (string)$url);
    }

    protected function makeTitleFromHost($url): string
    {
        return "Visit {$this->safelyParseHost($url)}";
    }
}