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| 1 | +// Cookieless Azure Application Insights (RUM) for the gh-aw book. |
| 2 | +// |
| 3 | +// Uses the dependency-free BEACON transport from @webmaxru/cookieless-insights: |
| 4 | +// no cookies, no local/session storage, no persistent id -> no consent banner. |
| 5 | +// The connection string is a PUBLIC client key injected at build time by |
| 6 | +// site/generate.py as `window.__APPINSIGHTS_CONNECTION_STRING__` (empty in local |
| 7 | +// builds, so analytics is a no-op unless a key is present). |
| 8 | +// |
| 9 | +// Bundled to site/assets/analytics.js via `npm run build:analytics` (esbuild). |
| 10 | + |
| 11 | +import { |
| 12 | + init, |
| 13 | + trackEvent, |
| 14 | + trackChangeDebounced, |
| 15 | + getClient, |
| 16 | +} from '@webmaxru/cookieless-insights'; |
| 17 | + |
| 18 | +// ───────────────────────────────────────────────────────────────────────── |
| 19 | +// KILL SWITCH: set to false to disable ALL telemetry (no beacon, no events). |
| 20 | +const ANALYTICS_ENABLED = true; |
| 21 | +// ───────────────────────────────────────────────────────────────────────── |
| 22 | + |
| 23 | +const connectionString = |
| 24 | + (typeof window !== 'undefined' && window.__APPINSIGHTS_CONNECTION_STRING__) || ''; |
| 25 | + |
| 26 | +// Safe no-op when disabled or when no connection string is present. Sends an |
| 27 | +// automatic page view on init (cookieless, in-memory session id per page load). |
| 28 | +init({ |
| 29 | + connectionString, |
| 30 | + enabled: ANALYTICS_ENABLED, |
| 31 | + cloudRole: 'gh-aw-book', |
| 32 | +}); |
| 33 | + |
| 34 | +// Coarse, non-PII page context attached to every custom event. |
| 35 | +function context() { |
| 36 | + const isHome = !!(document.body && document.body.classList.contains('home')); |
| 37 | + return { page: isHome ? 'home' : 'chapter', path: location.pathname }; |
| 38 | +} |
| 39 | + |
| 40 | +function langOf(codeEl) { |
| 41 | + const cls = (codeEl && codeEl.className) || ''; |
| 42 | + const match = cls.match(/(?:language|lang)-([a-z0-9]+)/i); |
| 43 | + return match ? match[1].toLowerCase() : 'text'; |
| 44 | +} |
| 45 | + |
| 46 | +function trackLink(link) { |
| 47 | + const href = link.getAttribute('href') || ''; |
| 48 | + if (!href || href.startsWith('javascript:')) return; |
| 49 | + |
| 50 | + // In-page anchor: reader jumped to a section (TOC, "Contents", section links). |
| 51 | + if (href.startsWith('#')) { |
| 52 | + trackEvent('Section Navigated', { ...context(), hash: href.slice(0, 80) }); |
| 53 | + return; |
| 54 | + } |
| 55 | + |
| 56 | + let url; |
| 57 | + try { |
| 58 | + url = new URL(href, location.href); |
| 59 | + } catch { |
| 60 | + return; |
| 61 | + } |
| 62 | + |
| 63 | + if (url.origin !== location.origin) { |
| 64 | + // Outbound: book repo, gh-aw, docs, author links, etc. |
| 65 | + trackEvent('Outbound Link Clicked', { ...context(), host: url.host, href: url.href }); |
| 66 | + return; |
| 67 | + } |
| 68 | + |
| 69 | + // Same-origin navigation between book pages (chapter cards, pager, brand). |
| 70 | + const label = (link.textContent || '').replace(/\s+/g, ' ').trim().slice(0, 60); |
| 71 | + trackEvent('Internal Link Clicked', { ...context(), to: url.pathname + url.hash, label }); |
| 72 | +} |
| 73 | + |
| 74 | +function onClick(event) { |
| 75 | + const el = event.target instanceof Element ? event.target : null; |
| 76 | + if (!el) return; |
| 77 | + |
| 78 | + const themeBtn = el.closest('.theme-opt'); |
| 79 | + if (themeBtn) { |
| 80 | + trackEvent('Theme Changed', { ...context(), theme: themeBtn.dataset.themeValue || 'unknown' }); |
| 81 | + return; |
| 82 | + } |
| 83 | + |
| 84 | + const sidebarBtn = el.closest('.sidebar-toggle'); |
| 85 | + if (sidebarBtn) { |
| 86 | + // aria-expanded still holds the pre-toggle state at click time; invert it. |
| 87 | + const willOpen = sidebarBtn.getAttribute('aria-expanded') !== 'true'; |
| 88 | + trackEvent('Chapter Sidebar Toggled', { ...context(), open: String(willOpen) }); |
| 89 | + return; |
| 90 | + } |
| 91 | + |
| 92 | + const copyBtn = el.closest('.copy-code'); |
| 93 | + if (copyBtn) { |
| 94 | + const host = copyBtn.closest('figure.code, .code-block'); |
| 95 | + const codeEl = host ? host.querySelector('code') : null; |
| 96 | + trackEvent('Code Copied', { ...context(), language: codeEl ? langOf(codeEl) : 'text' }); |
| 97 | + return; |
| 98 | + } |
| 99 | + |
| 100 | + const link = el.closest('a[href]'); |
| 101 | + if (link) trackLink(link); |
| 102 | +} |
| 103 | + |
| 104 | +// Debounced typing / slider drags. The site has no such inputs today; this |
| 105 | +// future-proofs any range slider, search box, or textarea by collapsing rapid |
| 106 | +// changes into a single event per control. |
| 107 | +function onInput(event) { |
| 108 | + const el = event.target instanceof Element ? event.target : null; |
| 109 | + if (!el) return; |
| 110 | + const tag = el.tagName; |
| 111 | + const type = (el.getAttribute && el.getAttribute('type')) || ''; |
| 112 | + const isTextInput = |
| 113 | + tag === 'INPUT' && ['range', 'text', 'search', 'number', ''].includes(type); |
| 114 | + if (isTextInput || tag === 'TEXTAREA' || el.getAttribute('contenteditable') === 'true') { |
| 115 | + const key = el.id || el.getAttribute('name') || type || tag.toLowerCase(); |
| 116 | + trackChangeDebounced('Input Changed', String(key)); |
| 117 | + } |
| 118 | +} |
| 119 | + |
| 120 | +function wire() { |
| 121 | + // "Opened via shared link": arrived on a deep link to a specific section. |
| 122 | + if (location.hash && location.hash.length > 1) { |
| 123 | + trackEvent('Opened Via Shared Link', { ...context(), hash: location.hash.slice(0, 80) }); |
| 124 | + } |
| 125 | + // Capture phase so we still see events even if a handler stops propagation. |
| 126 | + document.addEventListener('click', onClick, true); |
| 127 | + document.addEventListener('input', onInput, true); |
| 128 | +} |
| 129 | + |
| 130 | +// Only attach listeners when telemetry is actually live (no-op otherwise). |
| 131 | +if (getClient() && getClient().enabled) { |
| 132 | + if (document.readyState === 'loading') { |
| 133 | + document.addEventListener('DOMContentLoaded', wire, { once: true }); |
| 134 | + } else { |
| 135 | + wire(); |
| 136 | + } |
| 137 | +} |
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