HtmlMailBodyComposer.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\Mail\Mime\Presentation;
 
use ILIAS\Data\Factory as DataFactory;
use ILIAS\Mail\Mime\Presentation\Asset\MailAssets;
use ILIAS\Refinery\Factory as Refinery;
use ILIAS\UI\Factory as UIFactory;
use ILIAS\UI\Renderer;
 
final class HtmlMailBodyComposer implements MailBodyComposer
{
    private const string BLOCK_ELEMENT_PATTERN = '~</?(p|br|div|ul|ol|li|code|pre|h[1-6])\b~i';
    private const string INLINE_TAGS = '<b><u><i><a>';
 
    public function __construct(
        private readonly MailAssets $assets,
        private readonly PlainTextMailBodyComposer $plain_text,
        private readonly UIFactory $ui,
        private readonly Renderer $renderer,
        private readonly Refinery $refinery,
        private readonly DataFactory $data,
        private readonly string $installation_title,
        private readonly string $installation_url
    ) {
    }
 
    public function compose(MailBodySource $source): ComposedMailBody
    {
        $html = $source->transformedToHtml();
        $html = $this->containsHtml($html) ? $html : nl2br($html);
        $html = $this->refinery->string()->makeClickable()->transform($html);
 
        $images = $this->assets->inlineImages();
        $logo = $images->logo();
        $page = $this->ui->layout()->page()->mail(
            $this->assets->styleSheet()->path(),
            'cid:' . ($logo?->cid() ?? ''),
            $this->installation_title,
            $this->ui->legacy()->content($html),
            $this->data->link($this->installation_url, $this->data->uri($this->installation_url))
        );
        $plain_text = $this->plain_text->compose(new MailBodySource($html));
 
        return new ComposedMailBody(
            $this->renderer->render($page),
            $plain_text->body(),
            $images
        );
    }
 
    private function containsHtml(string $email_body): bool
    {
        if (!str_contains($email_body, '<') || !str_contains($email_body, '>')) {
            return false;
        }
 
        if (preg_match(self::BLOCK_ELEMENT_PATTERN, $email_body) === 1) {
            return true;
        }
 
        return strip_tags($email_body, self::INLINE_TAGS) !== $email_body;
    }
}