Advanced Technical SEO for Jekyll Sites with Cloudflare Edge Functions

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// workers/lcp-optimizer.js
addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
  const response = await fetch(request)
  const contentType = response.headers.get('Content-Type')
  
  if (!contentType || !contentType.includes('text/html')) {
    return response
  }
  
  let html = await response.text()
  
  // 1. Inject preload links for critical resources
  html = injectPreloadLinks(html)
  
  // 2. Lazy load non-critical images
  html = addLazyLoading(html)
  
  // 3. Remove render-blocking CSS/JS
  html = deferNonCriticalResources(html)
  
  // 4. Add resource hints
  html = addResourceHints(html, request)
  
  return new Response(html, response)
}

function injectPreloadLinks(html) {
  // Find hero image (first content image)
  const heroImageMatch = html.match(/]+src="([^"]+)"[^>]*>/)
  
  if (heroImageMatch) {
    const preloadLink = `<link rel="preload" as="image" href="${heroImageMatch[1]}">`
    html = html.replace('</head>', `${preloadLink}</head>`)
  }
  
  return html
}

// workers/cls-preventer.js
function addImageDimensions(html) {
  // Add width/height attributes to all images without them
  return html.replace(
    /])+src="([^"]+)"([^>]*)>/g,
    (match, before, src, after) => {
      // Fetch image dimensions (cached)
      const dimensions = getImageDimensions(src)
      
      if (dimensions) {
        return `<img${before}src="${src}" width="${dimensions.width}" height="${dimensions.height}"${after}>`
      }
      
      return match
    }
  )
}

function reserveSpaceForAds(html) {
  // Reserve space for dynamic ad units
  return html.replace(
    /
]*><\/div>/g,
    '<div class="ad-unit" style="min-height: 250px;"></div>'
  )
}

// workers/fid-improver.js
function deferJavaScript(html) {
  // Add defer attribute to non-critical scripts
  return html.replace(
    /]+)src="([^"]+)">/g,
    (match, attributes, src) => {
      if (!src.includes('analytics') && !src.includes('critical')) {
        return `<script${attributes}src="${src}" defer>`
      }
      return match
    }
  )
}

function optimizeEventListeners(html) {
  // Replace inline event handlers with passive listeners
  return html.replace(
    /onscroll="([^"]+)"/g,
    'data-scroll-handler="$1"'
  ).replace(
    /onclick="([^"]+)"/g,
    'data-click-handler="$1"'
  )
}

// workers/schema-generator.js
async function generateDynamicSchema(request, html) {
  const url = new URL(request.url)
  const userAgent = request.headers.get('User-Agent')
  
  // Only generate for crawlers
  if (!isSearchEngineCrawler(userAgent)) {
    return html
  }
  
  // Extract page type from URL and content
  const pageType = determinePageType(url, html)
  
  // Generate appropriate schema
  const schema = await generateSchemaForPageType(pageType, url, html)
  
  // Inject into page
  return injectSchema(html, schema)
}

function determinePageType(url, html) {
  if (url.pathname.includes('/blog/') || url.pathname.includes('/post/')) {
    return 'Article'
  } else if (url.pathname.includes('/product/')) {
    return 'Product'
  } else if (url.pathname === '/') {
    return 'Website'
  } else if (html.includes('recipe')) {
    return 'Recipe'
  } else if (html.includes('faq') || html.includes('question')) {
    return 'FAQPage'
  }
  
  return 'WebPage'
}

async function generateSchemaForPageType(pageType, url, html) {
  const baseSchema = {
    "@context": "https://schema.org",
    "@type": pageType,
    "url": url.href,
    "datePublished": extractDatePublished(html),
    "dateModified": extractDateModified(html)
  }
  
  switch(pageType) {
    case 'Article':
      return {
        ...baseSchema,
        "headline": extractTitle(html),
        "description": extractDescription(html),
        "author": extractAuthor(html),
        "publisher": {
          "@type": "Organization",
          "name": "Your Site Name",
          "logo": {
            "@type": "ImageObject",
            "url": "https://yoursite.com/logo.png"
          }
        },
        "image": extractImages(html),
        "mainEntityOfPage": {
          "@type": "WebPage",
          "@id": url.href
        }
      }
      
    case 'FAQPage':
      const questions = extractFAQs(html)
      return {
        ...baseSchema,
        "mainEntity": questions.map(q => ({
          "@type": "Question",
          "name": q.question,
          "acceptedAnswer": {
            "@type": "Answer",
            "text": q.answer
          }
        }))
      }
      
    default:
      return baseSchema
  }
}

function injectSchema(html, schema) {
  const schemaScript = `<script type="application/ld+json">${JSON.stringify(schema, null, 2)}</script>`
  return html.replace('</head>', `${schemaScript}</head>`)
}

// workers/dynamic-sitemap.js
addEventListener('fetch', event => {
  const url = new URL(event.request.url)
  
  if (url.pathname === '/sitemap.xml' || url.pathname.endsWith('sitemap.xml')) {
    event.respondWith(generateSitemap(event.request))
  } else {
    event.respondWith(fetch(event.request))
  }
})

async function generateSitemap(request) {
  // Fetch site content (from KV store or API)
  const pages = await getPagesFromKV()
  
  // Get traffic data for priority calculation
  const trafficData = await getTrafficData()
  
  // Generate sitemap with dynamic priorities
  const sitemap = generateXMLSitemap(pages, trafficData)
  
  return new Response(sitemap, {
    headers: {
      'Content-Type': 'application/xml',
      'Cache-Control': 'public, max-age=3600'
    }
  })
}

function generateXMLSitemap(pages, trafficData) {
  let xml = '<?xml version="1.0" encoding="UTF-8"?>\n'
  xml += '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">\n'
  
  pages.forEach(page => {
    const priority = calculatePriority(page, trafficData)
    const changefreq = calculateChangeFrequency(page)
    
    xml += '  <url>\n'
    xml += `    <loc>${page.url}</loc>\n`
    xml += `    <lastmod>${page.lastmod}</lastmod>\n`
    xml += `    <changefreq>${changefreq}</changefreq>\n`
    xml += `    <priority>${priority}</priority>\n`
    xml += '  </url>\n'
  })
  
  xml += '</urlset>'
  return xml
}

function calculatePriority(page, trafficData) {
  // Base priority on actual traffic and importance
  const pageTraffic = trafficData[page.url] || 0
  const maxTraffic = Math.max(...Object.values(trafficData))
  
  let priority = 0.5 // Default
  
  if (page.url === '/') {
    priority = 1.0
  } else if (pageTraffic > maxTraffic * 0.1) { // Top 10% of traffic
    priority = 0.9
  } else if (pageTraffic > maxTraffic * 0.01) { // Top 1% of traffic
    priority = 0.7
  } else if (pageTraffic > 0) {
    priority = 0.5
  } else {
    priority = 0.3
  }
  
  return priority.toFixed(1)
}

function calculateChangeFrequency(page) {
  const now = new Date()
  const lastMod = new Date(page.lastmod)
  const daysSinceUpdate = (now - lastMod) / (1000 * 60 * 60 * 24)
  
  if (daysSinceUpdate < 7) return 'daily'
  if (daysSinceUpdate < 30) return 'weekly'
  if (daysSinceUpdate < 90) return 'monthly'
  return 'yearly'
}

// workers/international-seo.js
const SUPPORTED_LOCALES = {
  'en': 'https://yoursite.com',
  'en-US': 'https://yoursite.com/us/',
  'en-GB': 'https://yoursite.com/uk/',
  'es': 'https://yoursite.com/es/',
  'fr': 'https://yoursite.com/fr/',
  'de': 'https://yoursite.com/de/'
}

addEventListener('fetch', event => {
  event.respondWith(handleInternationalRequest(event.request))
})

async function handleInternationalRequest(request) {
  const url = new URL(request.url)
  const userAgent = request.headers.get('User-Agent')
  
  // Add hreflang for crawlers
  if (isSearchEngineCrawler(userAgent)) {
    const response = await fetch(request)
    
    if (response.headers.get('Content-Type')?.includes('text/html')) {
      const html = await response.text()
      const enhancedHtml = addHreflangTags(html, url)
      
      return new Response(enhancedHtml, response)
    }
    
    return response
  }
  
  // Geo-redirect for users
  const country = request.headers.get('CF-IPCountry')
  const acceptLanguage = request.headers.get('Accept-Language')
  
  const targetLocale = determineBestLocale(country, acceptLanguage, url)
  
  if (targetLocale && targetLocale !== 'en') {
    // Redirect to localized version
    const localizedUrl = getLocalizedUrl(url, targetLocale)
    return Response.redirect(localizedUrl, 302)
  }
  
  return fetch(request)
}

function addHreflangTags(html, currentUrl) {
  let hreflangTags = ''
  
  Object.entries(SUPPORTED_LOCALES).forEach(([locale, baseUrl]) => {
    const localizedUrl = getLocalizedUrl(currentUrl, locale, baseUrl)
    hreflangTags += `<link rel="alternate" hreflang="${locale}" href="${localizedUrl}" />\n`
  })
  
  // Add x-default
  hreflangTags += `<link rel="alternate" hreflang="x-default" href="${SUPPORTED_LOCALES['en']}${currentUrl.pathname}" />\n`
  
  // Inject into head
  return html.replace('</head>', `${hreflangTags}</head>`)
}

function determineBestLocale(country, acceptLanguage, url) {
  // Country-based detection
  const countryToLocale = {
    'US': 'en-US',
    'GB': 'en-GB',
    'ES': 'es',
    'FR': 'fr',
    'DE': 'de'
  }
  
  if (country && countryToLocale[country]) {
    return countryToLocale[country]
  }
  
  // Language header detection
  if (acceptLanguage) {
    const languages = acceptLanguage.split(',')
    for (const lang of languages) {
      const locale = lang.split(';')[0].trim()
      if (SUPPORTED_LOCALES[locale]) {
        return locale
      }
    }
  }
  
  return null
}

// workers/crawl-optimizer.js
addEventListener('fetch', event => {
  const url = new URL(event.request.url)
  const userAgent = event.request.headers.get('User-Agent')
  
  // Serve different robots.txt for different crawlers
  if (url.pathname === '/robots.txt') {
    event.respondWith(serveDynamicRobotsTxt(userAgent))
  }
  
  // Rate limit aggressive crawlers
  if (isAggressiveCrawler(userAgent)) {
    event.respondWith(handleAggressiveCrawler(event.request))
  }
})

async function serveDynamicRobotsTxt(userAgent) {
  let robotsTxt = `User-agent: *\n`
  robotsTxt += `Disallow: /admin/\n`
  robotsTxt += `Disallow: /private/\n`
  robotsTxt += `Allow: /$\n`
  robotsTxt += `\n`
  
  // Custom rules for specific crawlers
  if (userAgent.includes('Googlebot')) {
    robotsTxt += `User-agent: Googlebot\n`
    robotsTxt += `Allow: /\n`
    robotsTxt += `Crawl-delay: 1\n`
    robotsTxt += `\n`
  }
  
  if (userAgent.includes('Bingbot')) {
    robotsTxt += `User-agent: Bingbot\n`
    robotsTxt += `Allow: /\n`
    robotsTxt += `Crawl-delay: 2\n`
    robotsTxt += `\n`
  }
  
  // Block AI crawlers if desired
  if (isAICrawler(userAgent)) {
    robotsTxt += `User-agent: ${userAgent}\n`
    robotsTxt += `Disallow: /\n`
    robotsTxt += `\n`
  }
  
  robotsTxt += `Sitemap: https://yoursite.com/sitemap.xml\n`
  
  return new Response(robotsTxt, {
    headers: {
      'Content-Type': 'text/plain',
      'Cache-Control': 'public, max-age=86400'
    }
  })
}

async function handleAggressiveCrawler(request) {
  const crawlerKey = `crawler:${request.headers.get('CF-Connecting-IP')}`
  const requests = await CRAWLER_KV.get(crawlerKey)
  
  if (requests && parseInt(requests) > 100) {
    // Too many requests, serve 429
    return new Response('Too Many Requests', {
      status: 429,
      headers: {
        'Retry-After': '3600'
      }
    })
  }
  
  // Increment counter
  await CRAWLER_KV.put(crawlerKey, (parseInt(requests || 0) + 1).toString(), {
    expirationTtl: 3600
  })
  
  // Add crawl-delay header
  const response = await fetch(request)
  const newResponse = new Response(response.body, response)
  newResponse.headers.set('X-Robots-Tag', 'crawl-delay: 5')
  
  return newResponse
}

function isAICrawler(userAgent) {
  const aiCrawlers = [
    'GPTBot',
    'ChatGPT-User',
    'Google-Extended',
    'CCBot',
    'anthropic-ai'
  ]
  
  return aiCrawlers.some(crawler => userAgent.includes(crawler))
}