Usa screenshot di pagina come sfondo heatmap al posto dell’iframe.

Cattura periodica client-side (con consenso), storage ActiveStorage e overlay allineato all’immagine.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/controllers/admin/analytics_controller.rb

@@ -75,7 +75,7 @@ module Admin
       @max_scroll = stats.maximum(:max_scroll_pct).to_i
       @avg_scroll = @scroll_samples.positive? ? (@scroll_sum.to_f / @scroll_samples).round : 0
       @grid = AnalyticsPageCell::GRID_SIZE
-      @preview_url = preview_url_for(@page_path)
+      @snapshot = find_snapshot(@page_path, @filters[:device])
     end
 
     private
@@ -88,11 +88,14 @@ module Admin
       nil
     end
 
-    def preview_url_for(path)
-      return nil if path.blank?
-      return nil if path.include?(":")
+    def find_snapshot(page_path, device)
+      scope = AnalyticsPageSnapshot.where(page_path: page_path)
+      if device.present? && AnalyticsEvent::DEVICES.include?(device)
+        snap = scope.find_by(device: device)
+        return snap if snap&.image&.attached?
+      end
 
-      "#{MatchLiveTv.app_public_url.chomp('/')}#{path}"
+      scope.order(captured_at: :desc).detect { |s| s.image.attached? }
     end
   end
 end

backend/app/controllers/analytics/snapshots_controller.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+module Analytics
+  class SnapshotsController < ActionController::API
+    def create
+      result = Analytics::SnapshotIngest.new(
+        path: params[:path] || params[:page_path],
+        device: params[:device],
+        width: params[:width],
+        height: params[:height],
+        image: params[:image],
+        remote_ip: request.remote_ip
+      ).call
+
+      return head :too_many_requests if result.rate_limited
+      return render json: { ok: false, error: result.error }, status: :unprocessable_content unless result.ok
+
+      render json: { ok: true, skipped: result.skipped }, status: :accepted
+    end
+  end
+end

backend/app/models/analytics_page_snapshot.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class AnalyticsPageSnapshot < ApplicationRecord
+  self.table_name = "analytics_page_snapshots"
+
+  has_one_attached :image
+
+  validates :page_path, presence: true
+  validates :device, inclusion: { in: AnalyticsEvent::DEVICES }
+  validates :width, :height, numericality: { greater_than: 0 }
+  validates :captured_at, presence: true
+end

backend/app/services/analytics/aggregate.rb

@@ -21,6 +21,10 @@ module Analytics
       AnalyticsEvent.where("occurred_at < ?", retention.ago).delete_all
       AnalyticsPageCell.where("day < ?", retention.ago.to_date).delete_all
       AnalyticsPageStat.where("day < ?", retention.ago.to_date).delete_all
+      AnalyticsPageSnapshot.where("captured_at < ?", retention.ago).find_each do |snap|
+        snap.image.purge if snap.image.attached?
+        snap.destroy!
+      end
     end
 
     private

backend/app/services/analytics/snapshot_ingest.rb

@@ -0,0 +1,84 @@
+# frozen_string_literal: true
+
+module Analytics
+  class SnapshotIngest
+    MAX_BYTES = 1_800_000
+    MIN_REFRESH = 12.hours
+    RATE_LIMIT_PER_HOUR = 20
+
+    Result = Struct.new(:ok, :skipped, :rate_limited, :error, keyword_init: true)
+
+    def initialize(path:, device:, width:, height:, image:, remote_ip:)
+      @path = path
+      @device = device.to_s
+      @width = width
+      @height = height
+      @image = image
+      @remote_ip = remote_ip.to_s.presence || "unknown"
+    end
+
+    def call
+      return Result.new(ok: false, skipped: false, rate_limited: true) if rate_limited?
+
+      page_path = PathNormalizer.normalize(@path)
+      return Result.new(ok: false, skipped: true, error: "path") if PathNormalizer.excluded?(page_path)
+      return Result.new(ok: false, skipped: true, error: "device") unless AnalyticsEvent::DEVICES.include?(@device)
+      return Result.new(ok: false, skipped: true, error: "image") unless valid_image?
+
+      width = Integer(@width)
+      height = Integer(@height)
+      return Result.new(ok: false, skipped: true, error: "size") if width < 200 || height < 200 || width > 6000 || height > 20000
+
+      snap = AnalyticsPageSnapshot.find_or_initialize_by(page_path: page_path, device: @device)
+      if snap.persisted? && snap.captured_at.present? && snap.captured_at > MIN_REFRESH.ago && snap.image.attached?
+        return Result.new(ok: true, skipped: true)
+      end
+
+      snap.width = width
+      snap.height = height
+      snap.captured_at = Time.current
+      snap.save!
+      snap.image.purge if snap.image.attached?
+      snap.image.attach(
+        io: image_io,
+        filename: "analytics-#{Digest::SHA1.hexdigest(page_path)[0, 12]}-#{@device}.jpg",
+        content_type: "image/jpeg"
+      )
+
+      Result.new(ok: true, skipped: false)
+    rescue ArgumentError, TypeError, ActiveRecord::RecordInvalid => e
+      Result.new(ok: false, skipped: true, error: e.class.name)
+    end
+
+    private
+
+    def rate_limited?
+      key = "analytics:snapshot:#{@remote_ip}"
+      redis = Redis.new(url: ENV.fetch("REDIS_URL", "redis://localhost:6379/0"))
+      count = redis.incr(key)
+      redis.expire(key, 3600) if count == 1
+      count > RATE_LIMIT_PER_HOUR
+    rescue StandardError => e
+      Rails.logger.warn("[analytics] snapshot rate limit unavailable: #{e.class}")
+      false
+    end
+
+    def valid_image?
+      return false if @image.blank?
+      return false unless @image.respond_to?(:tempfile) || @image.respond_to?(:read)
+      return false if @image.respond_to?(:size) && @image.size.to_i > MAX_BYTES
+
+      content_type = @image.content_type.to_s if @image.respond_to?(:content_type)
+      content_type.blank? || content_type.start_with?("image/")
+    end
+
+    def image_io
+      if @image.respond_to?(:tempfile)
+        @image.tempfile.rewind
+        @image.tempfile
+      else
+        StringIO.new(@image.read)
+      end
+    end
+  end
+end

backend/app/views/admin/analytics/show.html.erb

@@ -95,27 +95,43 @@
 
   <% if @cells.any? %>
     <div class="admin-heatmap-stage" id="admin-heatmap-stage">
-      <% if @preview_url.present? %>
-        <iframe
-          class="admin-heatmap-frame"
-          src="<%= @preview_url %>"
-          title="<%= t("admin.analytics.show.preview_title") %>"
-          loading="lazy"
-          referrerpolicy="no-referrer"
-        ></iframe>
+      <% if @snapshot&.image&.attached? %>
+        <div
+          class="admin-heatmap-scaler"
+          id="admin-heatmap-scaler"
+          data-design-width="<%= [@snapshot.width, 1].max %>"
+          data-design-height="<%= [@snapshot.height, 1].max %>"
+        >
+          <%= image_tag url_for(@snapshot.image),
+                class: "admin-heatmap-shot",
+                id: "admin-heatmap-shot",
+                alt: t("admin.analytics.show.preview_title") %>
+          <canvas
+            id="admin-heatmap"
+            class="admin-heatmap-overlay"
+            data-grid="<%= @grid %>"
+            data-max="<%= [@max_weight, 1].max %>"
+            data-cells="<%= @cells.map { |(x, y), c| { x: x, y: y, c: c } }.to_json %>"
+          ></canvas>
+        </div>
+        <p class="muted admin-table-sub" style="margin: 0.75rem 1rem 1rem;">
+          <%= t("admin.analytics.show.snapshot_meta",
+                device: @snapshot.device,
+                at: l(@snapshot.captured_at, format: :short)) %>
+        </p>
       <% else %>
         <div class="admin-heatmap-fallback" aria-hidden="true"></div>
-        <p class="muted admin-heatmap-fallback-note"><%= t("admin.analytics.show.preview_unavailable") %></p>
+        <p class="muted admin-heatmap-fallback-note"><%= t("admin.analytics.show.snapshot_missing") %></p>
+        <canvas
+          id="admin-heatmap"
+          class="admin-heatmap-overlay"
+          data-grid="<%= @grid %>"
+          data-max="<%= [@max_weight, 1].max %>"
+          data-cells="<%= @cells.map { |(x, y), c| { x: x, y: y, c: c } }.to_json %>"
+        ></canvas>
       <% end %>
-      <canvas
-        id="admin-heatmap"
-        class="admin-heatmap-overlay"
-        data-grid="<%= @grid %>"
-        data-max="<%= [@max_weight, 1].max %>"
-        data-cells="<%= @cells.map { |(x, y), c| { x: x, y: y, c: c } }.to_json %>"
-      ></canvas>
     </div>
-    <script src="/admin-analytics-heatmap.js?v=2" defer></script>
+    <script src="/admin-analytics-heatmap.js?v=4" defer></script>
   <% else %>
     <p class="empty"><%= t("admin.analytics.show.no_points") %></p>
   <% end %>

backend/app/views/layouts/admin.html.erb

@@ -5,7 +5,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <meta name="robots" content="noindex, nofollow">
   <%= csrf_meta_tags %>
-  <link rel="stylesheet" href="/admin.css?v=13">
+  <link rel="stylesheet" href="/admin.css?v=15">
   <% if content_for?(:replay_archive_styles) %>
     <link rel="stylesheet" href="/marketing.css?v=42">
   <% end %>

backend/app/views/layouts/marketing.html.erb

@@ -26,7 +26,7 @@
     <script src="/password-toggle.js?v=2" defer></script>
     <link rel="stylesheet" href="/confirm-forms.css?v=4">
     <script src="/confirm-forms.js?v=7" defer></script>
-    <script src="/site-analytics.js?v=3" defer></script>
+    <script src="/site-analytics.js?v=4" defer></script>
     <script src="/cookie-consent.js?v=2" defer></script>
   </body>
 </html>

backend/app/views/layouts/marketing_live.html.erb

@@ -21,7 +21,7 @@
     <%= render "shared/marketing_footer" %>
     <link rel="stylesheet" href="/confirm-forms.css?v=4">
     <script src="/confirm-forms.js?v=7" defer></script>
-    <script src="/site-analytics.js?v=3" defer></script>
+    <script src="/site-analytics.js?v=4" defer></script>
     <script src="/cookie-consent.js?v=2" defer></script>
   </body>
 </html>

backend/config/locales/admin.de.yml

@@ -383,9 +383,11 @@ de:
         scroll_hint: "Durchschnitt %{avg}% · Maximum %{max}%"
         heatmap_moves: Mausbewegungs-Karte
         heatmap_clicks: Klickkarte
-        heatmap_hint: Farbiges Overlay auf der Live-Seite (aktuelles Layout). Grün = wenig, Rot = viel.
-        preview_title: Seitenvorschau
-        preview_unavailable: Vorschau für Pfade mit Platzhalter nicht verfügbar (z. B. /clubs/:id). Nur Overlay.
+        heatmap_hint: Farbiges Overlay auf dem Seiten-Screenshot. Grün = wenig, Rot = viel.
+        preview_title: Seiten-Screenshot
+        preview_unavailable: Vorschau für Pfade mit Platzhalter nicht verfügbar (z. B. /clubs/:id).
+        snapshot_missing: Noch kein Screenshot. Seite mit Analytics-Einwilligung (Desktop) besuchen und erneut versuchen.
+        snapshot_meta: "Screenshot %{device} · %{at}"
         no_points: Keine aggregierten Punkte für diese Ebene im Zeitraum.
         heatmap_title: Klickkarte
         no_clicks: Keine aggregierten Klicks für diese Seite im Zeitraum.

backend/config/locales/admin.en.yml

@@ -383,9 +383,11 @@ en:
         scroll_hint: "Average %{avg}% · max %{max}%"
         heatmap_moves: Mouse-move map
         heatmap_clicks: Click map
-        heatmap_hint: Colored overlay on the live page (current layout). Green = low, red = high.
-        preview_title: Page preview
-        preview_unavailable: Preview unavailable for paths with placeholders (e.g. /clubs/:id). Overlay only.
+        heatmap_hint: Colored overlay on the page screenshot. Green = low, red = high.
+        preview_title: Page screenshot
+        preview_unavailable: Preview unavailable for paths with placeholders (e.g. /clubs/:id).
+        snapshot_missing: No screenshot yet. Visit the page on the site with analytics consent (desktop), then retry in a few seconds.
+        snapshot_meta: "Screenshot %{device} · captured %{at}"
         no_points: No aggregated points for this layer in the period.
         heatmap_title: Click map
         no_clicks: No aggregated clicks for this page in the period.

backend/config/locales/admin.es.yml

@@ -383,9 +383,11 @@ es:
         scroll_hint: "Media %{avg}% · máximo %{max}%"
         heatmap_moves: Mapa de movimientos
         heatmap_clicks: Mapa de clics
-        heatmap_hint: Superposición de color sobre la página en vivo (layout actual). Verde = poco, rojo = mucho.
-        preview_title: Vista previa de la página
-        preview_unavailable: Vista previa no disponible para rutas con placeholder (p. ej. /clubs/:id). Solo overlay.
+        heatmap_hint: Superposición de color sobre la captura de la página. Verde = poco, rojo = mucho.
+        preview_title: Captura de página
+        preview_unavailable: Vista previa no disponible para rutas con placeholder (p. ej. /clubs/:id).
+        snapshot_missing: Aún no hay captura. Visita la página con consentimiento analytics (escritorio) y vuelve a intentarlo.
+        snapshot_meta: "Captura %{device} · %{at}"
         no_points: No hay puntos agregados para esta capa en el periodo.
         heatmap_title: Mapa de clics
         no_clicks: No hay clics agregados para esta página en el periodo.

backend/config/locales/admin.fr.yml

@@ -383,9 +383,11 @@ fr:
         scroll_hint: "Moyenne %{avg}% · maximum %{max}%"
         heatmap_moves: Carte des mouvements
         heatmap_clicks: Carte des clics
-        heatmap_hint: Superposition colorée sur la page live (mise en page actuelle). Vert = faible, rouge = fort.
-        preview_title: Aperçu de la page
-        preview_unavailable: Aperçu indisponible pour les chemins avec placeholder (ex. /clubs/:id). Overlay seul.
+        heatmap_hint: Superposition colorée sur la capture d’écran de la page. Vert = faible, rouge = fort.
+        preview_title: Capture de page
+        preview_unavailable: Aperçu indisponible pour les chemins avec placeholder (ex. /clubs/:id).
+        snapshot_missing: Pas encore de capture. Visitez la page avec consentement analytics (desktop), puis réessayez.
+        snapshot_meta: "Capture %{device} · %{at}"
         no_points: Aucun point agrégé pour cette couche sur la période.
         heatmap_title: Carte des clics
         no_clicks: Aucun clic agrégé pour cette page sur la période.

backend/config/locales/admin.it.yml

@@ -404,9 +404,11 @@ it:
         scroll_hint: "Media %{avg}% · massimo %{max}%"
         heatmap_moves: Mappa movimenti mouse
         heatmap_clicks: Mappa click
-        heatmap_hint: Overlay colorato sulla pagina live (layout attuale). Verde = poco, rosso = molto.
-        preview_title: Anteprima pagina
-        preview_unavailable: Anteprima non disponibile per path con placeholder (es. /clubs/:id). Mostra solo l’overlay.
+        heatmap_hint: Overlay colorato sullo screenshot della pagina. Verde = poco, rosso = molto.
+        preview_title: Screenshot pagina
+        preview_unavailable: Anteprima non disponibile per path con placeholder (es. /clubs/:id).
+        snapshot_missing: Nessuno screenshot ancora. Visita la pagina sul sito con consenso analytics (desktop) e riprova tra qualche secondo.
+        snapshot_meta: "Screenshot %{device} · catturato %{at}"
         no_points: Nessun punto aggregato per questo livello nel periodo.
         heatmap_title: Mappa click
         no_clicks: Nessun click aggregato per questa pagina nel periodo.

backend/config/locales/legal.en.yml

@@ -186,7 +186,7 @@ en:
       s4_2_row3_duration: 24 hours
       s4_2_row3_provider: Google
       s4_2_row4_name_html: "Heatmap / scroll (first-party)"
-      s4_2_row4_purpose: Aggregated mouse-move, click and scroll-depth counts by page and device type (no user identifiers)
+      s4_2_row4_purpose: Aggregated mouse-move, click and scroll-depth counts, plus page screenshots for heatmaps (no user identifiers)
       s4_2_row4_duration: Aggregates kept up to 30 days
       s4_2_row4_provider: Match Live TV (first-party)
       s4_2_p2_html: "You can withdraw consent from the banner or from your browser settings. Google information: %{google_privacy_link}, %{google_optout_link}."

backend/config/locales/legal.it.yml

@@ -186,7 +186,7 @@ it:
       s4_2_row3_duration: 24 ore
       s4_2_row3_provider: Google
       s4_2_row4_name_html: "Heatmap / scroll (prima parte)"
-      s4_2_row4_purpose: Conteggi aggregati di movimenti mouse, click e profondità di scroll per pagina e tipo di dispositivo (nessun identificativo utente)
+      s4_2_row4_purpose: Conteggi aggregati di movimenti mouse, click e profondità di scroll, più screenshot della pagina per le heatmaps (nessun identificativo utente)
       s4_2_row4_duration: Aggregati fino a 30 giorni
       s4_2_row4_provider: Match Live TV (prima parte)
       s4_2_p2_html: "Puoi revocare il consenso dal banner o dalle impostazioni del browser. Informazioni Google: %{google_privacy_link}, %{google_optout_link}."

backend/config/routes.rb

@@ -77,6 +77,7 @@ Rails.application.routes.draw do
   post "internal/validate_publish", to: "webhooks/mediamtx#validate_publish"
 
   post "analytics/events", to: "analytics/events#create"
+  post "analytics/snapshot", to: "analytics/snapshots#create"
 
   namespace :admin do
     get "login", to: "auth#new", as: :login

backend/db/migrate/20260820220000_create_analytics_page_snapshots.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+class CreateAnalyticsPageSnapshots < ActiveRecord::Migration[7.2]
+  def change
+    create_table :analytics_page_snapshots, id: :uuid, default: -> { "gen_random_uuid()" } do |t|
+      t.string :page_path, null: false
+      t.string :device, null: false
+      t.integer :width, null: false, default: 0
+      t.integer :height, null: false, default: 0
+      t.datetime :captured_at, null: false
+      t.timestamps
+    end
+
+    add_index :analytics_page_snapshots, %i[page_path device], unique: true, name: "index_analytics_page_snapshots_unique"
+  end
+end

backend/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.2].define(version: 2026_08_20_210000) do
+ActiveRecord::Schema[7.2].define(version: 2026_08_20_220000) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"
   enable_extension "plpgsql"
@@ -79,6 +79,17 @@ ActiveRecord::Schema[7.2].define(version: 2026_08_20_210000) do
     t.index ["day", "page_path", "device", "cell_x", "cell_y"], name: "index_analytics_page_cells_unique", unique: true
   end
 
+  create_table "analytics_page_snapshots", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
+    t.string "page_path", null: false
+    t.string "device", null: false
+    t.integer "width", default: 0, null: false
+    t.integer "height", default: 0, null: false
+    t.datetime "captured_at", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["page_path", "device"], name: "index_analytics_page_snapshots_unique", unique: true
+  end
+
   create_table "analytics_page_stats", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
     t.date "day", null: false
     t.string "page_path", null: false

backend/public/admin-analytics-heatmap.js

@@ -1,7 +1,6 @@
-/*! Admin heatmap overlay renderer (Hotjar-like radial blobs over page preview). */
+/*! Admin heatmap overlay on captured page screenshot. */
 (function () {
   function colorFor(t) {
-    // green -> yellow -> red
     if (t < 0.33) {
       var k = t / 0.33;
       return [67 + (255 - 67) * k, 160 + (235 - 160) * k, 71 * (1 - k)];
@@ -14,11 +13,36 @@
     return [255, 152 * (1 - k3), 0];
   }
 
-  function paint() {
+  function fit() {
     var canvas = document.getElementById("admin-heatmap");
     var stage = document.getElementById("admin-heatmap-stage");
+    var scaler = document.getElementById("admin-heatmap-scaler");
+    var shot = document.getElementById("admin-heatmap-shot");
     if (!canvas || !stage) return;
 
+    var designW = 1200;
+    var designH = 900;
+    if (scaler) {
+      designW = parseInt(scaler.getAttribute("data-design-width"), 10) || designW;
+      designH = parseInt(scaler.getAttribute("data-design-height"), 10) || designH;
+    }
+    if (shot && shot.naturalWidth > 0) {
+      designW = shot.naturalWidth;
+      designH = shot.naturalHeight;
+    }
+
+    if (scaler) {
+      scaler.style.width = designW + "px";
+      scaler.style.height = designH + "px";
+      var stageW = Math.max(stage.clientWidth, 320);
+      var scale = Math.min(1, stageW / designW);
+      scaler.style.transform = "scale(" + scale + ")";
+      stage.style.height = Math.max(420, Math.round(designH * scale)) + "px";
+    } else {
+      designW = Math.max(stage.clientWidth, 320);
+      designH = Math.max(stage.clientHeight, 480);
+    }
+
     var grid = parseInt(canvas.getAttribute("data-grid"), 10) || 40;
     var max = parseInt(canvas.getAttribute("data-max"), 10) || 1;
     var cells = [];
@@ -28,19 +52,17 @@
       cells = [];
     }
 
-    var width = Math.max(stage.clientWidth, 320);
-    var height = Math.max(stage.clientHeight, 480);
-    canvas.width = width;
-    canvas.height = height;
-    canvas.style.width = width + "px";
-    canvas.style.height = height + "px";
+    canvas.width = designW;
+    canvas.height = designH;
+    canvas.style.width = designW + "px";
+    canvas.style.height = designH + "px";
 
     var ctx = canvas.getContext("2d");
-    ctx.clearRect(0, 0, width, height);
+    ctx.clearRect(0, 0, designW, designH);
 
-    var cellW = width / grid;
-    var cellH = height / grid;
-    var radius = Math.max(cellW, cellH) * 1.8;
+    var cellW = designW / grid;
+    var cellH = designH / grid;
+    var radius = Math.max(cellW, cellH) * 2.2;
 
     cells.forEach(function (cell) {
       var intensity = Math.min(1, cell.c / max);
@@ -48,9 +70,16 @@
       var cx = (cell.x + 0.5) * cellW;
       var cy = (cell.y + 0.5) * cellH;
       var rgb = colorFor(intensity);
+      var alpha = 0.28 + intensity * 0.55;
       var grd = ctx.createRadialGradient(cx, cy, 0, cx, cy, radius);
-      grd.addColorStop(0, "rgba(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + "," + (0.2 + intensity * 0.55) + ")");
-      grd.addColorStop(1, "rgba(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + ",0)");
+      grd.addColorStop(
+        0,
+        "rgba(" + Math.round(rgb[0]) + "," + Math.round(rgb[1]) + "," + Math.round(rgb[2]) + "," + alpha + ")"
+      );
+      grd.addColorStop(
+        1,
+        "rgba(" + Math.round(rgb[0]) + "," + Math.round(rgb[1]) + "," + Math.round(rgb[2]) + ",0)"
+      );
       ctx.fillStyle = grd;
       ctx.beginPath();
       ctx.arc(cx, cy, radius, 0, Math.PI * 2);
@@ -58,10 +87,19 @@
     });
   }
 
+  function boot() {
+    var shot = document.getElementById("admin-heatmap-shot");
+    fit();
+    if (shot) {
+      if (shot.complete && shot.naturalWidth > 0) fit();
+      else shot.addEventListener("load", fit);
+    }
+    window.addEventListener("resize", fit);
+  }
+
   if (document.readyState === "loading") {
-    document.addEventListener("DOMContentLoaded", paint);
+    document.addEventListener("DOMContentLoaded", boot);
   } else {
-    paint();
+    boot();
   }
-  window.addEventListener("resize", paint);
 })();

backend/public/admin.css

@@ -962,22 +962,29 @@ body.admin-body {
 
 .admin-heatmap-stage {
   position: relative;
-  overflow: hidden;
+  overflow: auto;
+  width: 100%;
   min-height: 70vh;
   max-height: 85vh;
   border: 1px solid var(--card-border);
   border-radius: 10px;
-  background: #111;
+  background: #d7dbe2;
 }
 
-.admin-heatmap-frame {
-  position: absolute;
-  inset: 0;
-  width: 100%;
-  height: 100%;
-  border: 0;
+.admin-heatmap-scaler {
+  position: relative;
+  transform-origin: top left;
   background: #fff;
+  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.28);
+}
+
+.admin-heatmap-shot {
+  display: block;
+  width: 100%;
+  height: auto;
+  vertical-align: top;
   pointer-events: none;
+  user-select: none;
 }
 
 .admin-heatmap-fallback {
@@ -1003,9 +1010,8 @@ body.admin-body {
 
 .admin-heatmap-overlay {
   position: absolute;
-  inset: 0;
-  width: 100%;
-  height: 100%;
+  left: 0;
+  top: 0;
   z-index: 1;
   pointer-events: none;
 }

backend/public/site-analytics.js

@@ -3,12 +3,14 @@
   "use strict";
 
   var ENDPOINT = "/analytics/events";
+  var SNAPSHOT_ENDPOINT = "/analytics/snapshot";
   var STORAGE_KEY = "mltv_cookie_consent";
   var COOKIE_NAME = "mltv_cookie_consent";
   var FLUSH_MS = 6000;
   var MAX_QUEUE = 60;
   var MOVE_THROTTLE_MS = 180;
   var MOVE_GRID = 40;
+  var SNAPSHOT_DELAY_MS = 4000;
 
   var queue = [];
   var moveBuckets = {};
@@ -195,6 +197,87 @@
     }, FLUSH_MS);
   }
 
+  function snapshotStorageKey() {
+    return "mltv_snap:" + location.pathname + ":" + deviceBucket();
+  }
+
+  function todayKey() {
+    var d = new Date();
+    return d.getUTCFullYear() + "-" + (d.getUTCMonth() + 1) + "-" + d.getUTCDate();
+  }
+
+  function alreadyCapturedToday() {
+    try {
+      return localStorage.getItem(snapshotStorageKey()) === todayKey();
+    } catch (e) {
+      return false;
+    }
+  }
+
+  function markCapturedToday() {
+    try {
+      localStorage.setItem(snapshotStorageKey(), todayKey());
+    } catch (e) { /* ignore */ }
+  }
+
+  function loadHtml2Canvas(cb) {
+    if (window.html2canvas) {
+      cb(window.html2canvas);
+      return;
+    }
+    var s = document.createElement("script");
+    s.src = "/vendor/html2canvas.min.js";
+    s.async = true;
+    s.onload = function () {
+      if (window.html2canvas) cb(window.html2canvas);
+    };
+    s.onerror = function () { /* ignore */ };
+    document.head.appendChild(s);
+  }
+
+  function captureSnapshot() {
+    if (!hasAnalyticsConsent() || alreadyCapturedToday()) return;
+    loadHtml2Canvas(function (html2canvas) {
+      var size = pageSize();
+      html2canvas(document.documentElement, {
+        scale: Math.min(1, 1400 / Math.max(size.width, 1)),
+        useCORS: true,
+        allowTaint: false,
+        logging: false,
+        windowWidth: size.width,
+        windowHeight: size.height,
+        scrollX: 0,
+        scrollY: 0
+      })
+        .then(function (canvas) {
+          if (!canvas || !canvas.toBlob) return;
+          canvas.toBlob(
+            function (blob) {
+              if (!blob || blob.size < 8000 || blob.size > 1800000) return;
+              var fd = new FormData();
+              fd.append("image", blob, "snapshot.jpg");
+              fd.append("path", location.pathname);
+              fd.append("device", deviceBucket());
+              fd.append("width", String(Math.round(size.width)));
+              fd.append("height", String(Math.round(size.height)));
+              fetch(SNAPSHOT_ENDPOINT, {
+                method: "POST",
+                body: fd,
+                credentials: "same-origin"
+              })
+                .then(function (res) {
+                  if (res.ok) markCapturedToday();
+                })
+                .catch(function () { /* ignore */ });
+            },
+            "image/jpeg",
+            0.72
+          );
+        })
+        .catch(function () { /* ignore */ });
+    });
+  }
+
   function start() {
     if (started) return;
     if (excludedPath(location.pathname)) return;
@@ -216,6 +299,7 @@
       flush(true);
     });
     scheduleFlush();
+    setTimeout(captureSnapshot, SNAPSHOT_DELAY_MS);
   }
 
   window.mltvSiteAnalyticsStart = start;

backend/spec/requests/admin/analytics_spec.rb

@@ -39,7 +39,6 @@ RSpec.describe "Admin analytics", type: :request do
     get admin_analytics_page_path, params: { page_path: "/prezzi" }
     expect(response).to have_http_status(:ok)
     expect(response.body).to include("admin-heatmap")
-    expect(response.body).to include("admin-heatmap-frame")
     expect(response.body).to include("/prezzi")
   end
 end

backend/spec/requests/analytics/snapshots_spec.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe "Analytics snapshots", type: :request do
+  def jpeg_upload
+    path = Rails.root.join("tmp/analytics-snap-test.jpg")
+    FileUtils.mkdir_p(path.dirname)
+    # minimal valid-ish jpeg bytes for ActiveStorage
+    File.binwrite(path, "\xFF\xD8\xFF\xE0#{'x' * 12_000}\xFF\xD9")
+    Rack::Test::UploadedFile.new(path, "image/jpeg")
+  end
+
+  it "accetta uno screenshot e lo associa al path" do
+    post "/analytics/snapshot",
+         params: {
+           path: "/prezzi",
+           device: "desktop",
+           width: 1440,
+           height: 2200,
+           image: jpeg_upload
+         }
+
+    expect(response).to have_http_status(:accepted)
+    snap = AnalyticsPageSnapshot.find_by(page_path: "/prezzi", device: "desktop")
+    expect(snap).to be_present
+    expect(snap.image).to be_attached
+    expect(snap.width).to eq(1440)
+  end
+
+  it "rifiuta path esclusi" do
+    post "/analytics/snapshot",
+         params: {
+           path: "/admin/analytics",
+           device: "desktop",
+           width: 1440,
+           height: 900,
+           image: jpeg_upload
+         }
+
+    expect(response).to have_http_status(:unprocessable_content)
+    expect(AnalyticsPageSnapshot.count).to eq(0)
+  end
+end