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// SPDX-License-Identifier: Apache-2.0
/**
* @module Templates/ArticleTemplate
* @description Generates HTML templates for news articles with proper structure and metadata
*/
import type { ArticleOptions, ArticleSource, ArticleCategoryLabels } from '../types/index.js';
import {
ALL_LANGUAGES,
LANGUAGE_FLAGS,
LANGUAGE_NAMES,
ARTICLE_TYPE_LABELS,
READ_TIME_LABELS,
BACK_TO_NEWS_LABELS,
ARTICLE_NAV_LABELS,
SKIP_LINK_TEXTS,
getLocalizedString,
getTextDirection,
} from '../constants/languages.js';
import { escapeHTML, isSafeURL } from '../utils/file-utils.js';
/** Pattern for valid article dates (YYYY-MM-DD) */
const DATE_PATTERN = /^\d{4}-\d{2}-\d{2}$/u;
/** Pattern for valid article slugs (lowercase letters, digits, hyphens) */
const SLUG_PATTERN = /^[a-z0-9-]+$/u;
/**
* Build the article language switcher nav HTML.
* Links to the same article in all 14 languages using the filename pattern {date}-{slug}-{lang}.html.
*
* @param date - Article date (YYYY-MM-DD)
* @param slug - Article slug
* @param currentLang - Active language code
* @returns HTML string
*/
function buildArticleLangSwitcher(date: string, slug: string, currentLang: string): string {
if (!DATE_PATTERN.test(date)) {
throw new Error(`Invalid article date format: "${date}"`);
}
if (!SLUG_PATTERN.test(slug)) {
throw new Error(`Invalid article slug format: "${slug}"`);
}
const safeDate = escapeHTML(date);
const safeSlug = escapeHTML(slug);
return ALL_LANGUAGES.map((code) => {
const flag = getLocalizedString(LANGUAGE_FLAGS, code);
const name = getLocalizedString(LANGUAGE_NAMES, code);
const active = code === currentLang ? ' active' : '';
const href = `${safeDate}-${safeSlug}-${code}.html`;
const safeTitle = escapeHTML(name);
return `<a href="${href}" class="lang-link${active}" hreflang="${code}" lang="${code}" title="${safeTitle}">${flag} ${code.toUpperCase()}</a>`;
}).join('\n ');
}
/**
* Build a single footer section with title and content.
*
* @param title - Section heading text
* @param content - Inner HTML content
* @returns HTML string for one footer section
*/
function buildFooterSection(title: string, content: string): string {
return `<div class="footer-section">
<h3>${title}</h3>
${content}
</div>`;
}
/**
* Build the language grid for the article footer.
*
* @param currentLang - Active language code
* @returns HTML string for the language grid
*/
function buildArticleFooterLanguageGrid(currentLang: string): string {
return ALL_LANGUAGES.map((code) => {
const flag = getLocalizedString(LANGUAGE_FLAGS, code);
const safeName = escapeHTML(getLocalizedString(LANGUAGE_NAMES, code));
const href = code === 'en' ? '../index.html' : `../index-${code}.html`;
const active = code === currentLang ? ' class="active"' : '';
return `<a href="${href}"${active} hreflang="${code}">${flag} ${safeName}</a>`;
}).join('\n ');
}
/**
* Generate complete HTML for a news article
*
* @param options - Article generation options
* @returns Complete HTML document string
*/
export function generateArticleHTML(options: ArticleOptions): string {
const {
slug,
title,
subtitle,
date,
category,
readTime,
lang,
content,
keywords = [],
sources = [],
} = options;
const dir = getTextDirection(lang);
const year = new Date().getFullYear();
// Format date for display
const displayDate = new Date(date).toLocaleDateString(lang, {
year: 'numeric',
month: 'long',
day: 'numeric',
});
const languageName = getLocalizedString(LANGUAGE_NAMES, lang);
const categoryLabels = getLocalizedString(ARTICLE_TYPE_LABELS, lang) as ArticleCategoryLabels;
const categoryLabel = categoryLabels[category] ?? category;
const readTimeFormatter = getLocalizedString(READ_TIME_LABELS, lang);
const readTimeLabel = readTimeFormatter(readTime);
const backLabel = getLocalizedString(BACK_TO_NEWS_LABELS, lang);
const articleNavLabel = getLocalizedString(ARTICLE_NAV_LABELS, lang);
const skipLinkText = getLocalizedString(SKIP_LINK_TEXTS, lang);
const indexHref = lang === 'en' ? '../index.html' : `../index-${lang}.html`;
// Escape values for safe HTML embedding
const safeTitle = escapeHTML(title);
const safeSubtitle = escapeHTML(subtitle);
const safeKeywords = keywords.map((k) => escapeHTML(k)).join(', ');
const safeCategoryLabel = escapeHTML(categoryLabel);
// Build JSON-LD as object for safe serialization
const jsonLd = JSON.stringify(
{
'@context': 'https://schema.org',
'@type': 'NewsArticle',
headline: title,
description: subtitle,
datePublished: date,
inLanguage: lang,
author: {
'@type': 'Organization',
name: 'EU Parliament Monitor',
},
publisher: {
'@type': 'Organization',
name: 'EU Parliament Monitor',
url: 'https://euparliamentmonitor.com',
},
keywords: keywords.join(', '),
},
null,
4
);
return `<!DOCTYPE html>
<html lang="${lang}" dir="${dir}">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-Content-Type-Options" content="nosniff">
<meta name="referrer" content="no-referrer">
<title>${safeTitle} | EU Parliament Monitor</title>
<meta name="description" content="${safeSubtitle}">
<meta name="keywords" content="${safeKeywords}">
<meta name="author" content="EU Parliament Monitor">
<meta name="date" content="${date}">
<meta name="article:published_time" content="${date}">
<meta name="article:author" content="EU Parliament Monitor">
<!-- Open Graph -->
<meta property="og:type" content="article">
<meta property="og:title" content="${safeTitle}">
<meta property="og:description" content="${safeSubtitle}">
<meta property="og:site_name" content="EU Parliament Monitor">
<meta property="og:locale" content="${lang}">
<!-- Twitter Card -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="${safeTitle}">
<meta name="twitter:description" content="${safeSubtitle}">
<link rel="stylesheet" href="../styles.css">
<!-- Schema.org structured data -->
<script type="application/ld+json">
${jsonLd}
</script>
</head>
<body>
<div class="reading-progress" aria-hidden="true"></div>
<a href="#main" class="skip-link">${skipLinkText}</a>
<header class="site-header" role="banner">
<div class="site-header__inner">
<a href="${indexHref}" class="site-header__brand" aria-label="EU Parliament Monitor">
<span class="site-header__flag" aria-hidden="true">🇪🇺</span>
<span>
<span class="site-header__title">EU Parliament Monitor</span>
<span class="site-header__subtitle">European Parliament Intelligence</span>
</span>
</a>
</div>
</header>
<nav class="language-switcher" role="navigation" aria-label="Language selection">
${buildArticleLangSwitcher(date, slug, lang)}
</nav>
<nav class="article-top-nav" aria-label="${escapeHTML(articleNavLabel)}">
<a href="${indexHref}" class="back-to-news">${backLabel}</a>
</nav>
<main id="main" class="site-main">
<article class="news-article" lang="${lang}">
<header class="article-header">
<div class="article-meta">
<span class="article-type">${safeCategoryLabel}</span>
<span class="article-date">${displayDate}</span>
<span class="article-read-time">${readTimeLabel}</span>
<span class="article-lang">${languageName}</span>
</div>
<h1>${safeTitle}</h1>
<p class="article-subtitle">${safeSubtitle}</p>
</header>
${content}
${renderSourcesSection(sources)}
<nav class="article-nav" aria-label="${escapeHTML(articleNavLabel)}">
<a href="${indexHref}" class="back-to-news">${backLabel}</a>
</nav>
</article>
</main>
<footer class="site-footer" role="contentinfo">
<div class="footer-content">
${buildFooterSection('About EU Parliament Monitor', '<p>European Parliament Intelligence Platform — monitoring political activity with systematic transparency. Powered by European Parliament open data.</p>')}
${buildFooterSection(
'Quick Links',
`<ul>
<li><a href="../index.html">Home</a></li>
<li><a href="https://github.com/Hack23/euparliamentmonitor">GitHub Repository</a></li>
<li><a href="https://github.com/Hack23/euparliamentmonitor/blob/main/LICENSE">Apache-2.0 License</a></li>
<li><a href="https://www.europarl.europa.eu/">European Parliament</a></li>
</ul>`
)}
${buildFooterSection(
'Built by Hack23 AB',
`<ul>
<li><a href="https://hack23.com">hack23.com</a></li>
<li><a href="https://www.linkedin.com/company/hack23">LinkedIn</a></li>
<li><a href="https://github.com/Hack23/ISMS-PUBLIC">Security & Privacy Policy</a></li>
<li><a href="mailto:james@hack23.com">Contact</a></li>
</ul>`
)}
${buildFooterSection(
'Languages',
`<div class="language-grid">
${buildArticleFooterLanguageGrid(lang)}
</div>`
)}
</div>
<div class="footer-bottom">
<p>© 2008-${year} <a href="https://hack23.com">Hack23 AB</a> (Org.nr 5595347807) | Gothenburg, Sweden</p>
</div>
</footer>
</body>
</html>`;
}
/**
* Render the sources section if sources are provided
*
* @param sources - Article source references
* @returns HTML string for sources section or empty string
*/
function renderSourcesSection(sources: ArticleSource[]): string {
if (sources.length === 0) {
return '';
}
return `
<footer class="article-footer">
<section class="article-sources">
<h2>Sources</h2>
<ul>
${sources
.map((source) => {
const safeSourceTitle = escapeHTML(source.title);
const href = isSafeURL(source.url) ? escapeHTML(source.url) : '#';
return `<li><a href="${href}" target="_blank" rel="noopener noreferrer">${safeSourceTitle}</a></li>`;
})
.join('\n ')}
</ul>
</section>
</footer>
`;
}
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