Улучшение безопасности

library_service/static/page/index.js

@@ -0,0 +1,278 @@
+const $svg = $("#bookSvg");
+const NS = "http://www.w3.org/2000/svg";
+
+const svgWidth = 200;
+const svgHeight = 250;
+const lineCount = 5;
+const lineDelay = 16;
+const bookWidth = 120;
+const bookHeight = 180;
+const bookX = (svgWidth - bookWidth) / 2;
+const bookY = (svgHeight - bookHeight) / 2;
+const desiredLineSpacing = 8;
+const baseLineWidth = 2;
+const maxLineWidth = 8;
+const maxLineHeight = bookHeight - 24;
+const innerPaddingX = 15;
+const appearStagger = 8;
+
+let lineSpacing;
+if (lineCount > 1) {
+  const maxSpan = Math.max(0, bookWidth - maxLineWidth - 2 * innerPaddingX);
+  const wishSpan = desiredLineSpacing * (lineCount - 1);
+  const realSpan = Math.min(wishSpan, maxSpan);
+  lineSpacing = realSpan / (lineCount - 1);
+} else {
+  lineSpacing = 0;
+}
+const linesSpan = lineSpacing * (lineCount - 1);
+
+const rightBase = bookX + bookWidth - innerPaddingX - maxLineWidth;
+const lineStartX = rightBase - linesSpan + maxLineWidth;
+
+const leftLimit = bookX + innerPaddingX;
+
+let phase = 0;
+let time = 0;
+
+const baseAppearDuration = 40;
+const appearDuration = baseAppearDuration + (lineCount - 1) * appearStagger;
+
+const baseFlipDuration = 120;
+const flipDuration = baseFlipDuration + (lineCount - 1) * lineDelay;
+
+const baseDisappearDuration = 40;
+const disappearDuration =
+  baseDisappearDuration + (lineCount - 1) * appearStagger;
+
+const pauseDuration = 30;
+
+const book = document.createElementNS(NS, "rect");
+$(book)
+  .attr("x", bookX)
+  .attr("y", bookY)
+  .attr("width", bookWidth)
+  .attr("height", bookHeight)
+  .attr("fill", "#374151")
+  .attr("rx", "4");
+$svg.append(book);
+
+const lines = [];
+for (let i = 0; i < lineCount; i++) {
+  const line = document.createElementNS(NS, "rect");
+  $(line).attr("fill", "#ffffff").attr("rx", "1");
+  $svg.append(line);
+
+  const baseX = lineStartX + i * lineSpacing;
+  const targetX = leftLimit + i * lineSpacing;
+  const moveDistance = baseX - targetX;
+
+  lines.push({
+    el: $(line),
+    baseX,
+    targetX,
+    moveDistance,
+    currentX: baseX,
+    width: baseLineWidth,
+    height: 0,
+  });
+}
+
+function easeInOutQuad(t) {
+  return t < 0.5 ? 2 * t * t : 1 - Math.pow(-2 * t + 2, 2) / 2;
+}
+
+function easeOutQuad(t) {
+  return 1 - (1 - t) * (1 - t);
+}
+
+function easeInQuad(t) {
+  return t * t;
+}
+
+function updateLine(line) {
+  const $el = line.el;
+  const centerY = bookY + bookHeight / 2;
+
+  $el
+    .attr("x", line.currentX)
+    .attr("y", centerY - line.height / 2)
+    .attr("width", line.width)
+    .attr("height", Math.max(0, line.height));
+}
+
+function animateBook() {
+  time++;
+
+  if (phase === 0) {
+    for (let i = 0; i < lineCount; i++) {
+      const delay = (lineCount - 1 - i) * appearStagger;
+      const localTime = Math.max(0, time - delay);
+      const progress = Math.min(1, localTime / baseAppearDuration);
+      const easedProgress = easeOutQuad(progress);
+
+      lines[i].height = maxLineHeight * easedProgress;
+      lines[i].currentX = lines[i].baseX;
+      lines[i].width = baseLineWidth;
+      updateLine(lines[i]);
+    }
+
+    if (time >= appearDuration) {
+      phase = 1;
+      time = 0;
+    }
+  } else if (phase === 1) {
+    for (let i = 0; i < lineCount; i++) {
+      const delay = i * lineDelay;
+      const localTime = Math.max(0, time - delay);
+      const progress = Math.min(1, localTime / baseFlipDuration);
+
+      const moveProgress = easeInOutQuad(progress);
+      lines[i].currentX = lines[i].baseX - lines[i].moveDistance * moveProgress;
+
+      const widthProgress =
+        progress < 0.5
+          ? easeOutQuad(progress * 2)
+          : 1 - easeInQuad((progress - 0.5) * 2);
+
+      lines[i].width =
+        baseLineWidth + (maxLineWidth - baseLineWidth) * widthProgress;
+
+      updateLine(lines[i]);
+    }
+
+    if (time >= flipDuration) {
+      phase = 2;
+      time = 0;
+    }
+  } else if (phase === 2) {
+    for (let i = 0; i < lineCount; i++) {
+      const delay = (lineCount - 1 - i) * appearStagger;
+      const localTime = Math.max(0, time - delay);
+      const progress = Math.min(1, localTime / baseDisappearDuration);
+      const easedProgress = easeInQuad(progress);
+
+      lines[i].height = maxLineHeight * (1 - easedProgress);
+      updateLine(lines[i]);
+    }
+
+    if (time >= disappearDuration + pauseDuration) {
+      phase = 0;
+      time = 0;
+      for (let i = 0; i < lineCount; i++) {
+        lines[i].currentX = lines[i].baseX;
+        lines[i].width = baseLineWidth;
+        lines[i].height = 0;
+      }
+    }
+  }
+
+  requestAnimationFrame(animateBook);
+}
+
+animateBook();
+
+function animateCounter($element, target, duration = 2000) {
+  const start = 0;
+  const startTime = performance.now();
+
+  function update(currentTime) {
+    const elapsed = currentTime - startTime;
+    const progress = Math.min(elapsed / duration, 1);
+
+    const easedProgress = 1 - Math.pow(1 - progress, 3);
+    const current = Math.floor(start + (target - start) * easedProgress);
+
+    $element.text(current.toLocaleString("ru-RU"));
+
+    if (progress < 1) {
+      requestAnimationFrame(update);
+    } else {
+      $element.text(target.toLocaleString("ru-RU"));
+    }
+  }
+
+  requestAnimationFrame(update);
+}
+
+async function loadStats() {
+  try {
+    const response = await fetch("/api/stats");
+    if (!response.ok) {
+      throw new Error("Ошибка загрузки статистики");
+    }
+
+    const stats = await response.json();
+
+    setTimeout(() => {
+      const $booksEl = $("#stat-books");
+      const $authorsEl = $("#stat-authors");
+      const $genresEl = $("#stat-genres");
+      const $usersEl = $("#stat-users");
+
+      if ($booksEl.length) {
+        animateCounter($booksEl, stats.books, 1500);
+      }
+
+      setTimeout(() => {
+        if ($authorsEl.length) {
+          animateCounter($authorsEl, stats.authors, 1500);
+        }
+      }, 150);
+
+      setTimeout(() => {
+        if ($genresEl.length) {
+          animateCounter($genresEl, stats.genres, 1500);
+        }
+      }, 300);
+
+      setTimeout(() => {
+        if ($usersEl.length) {
+          animateCounter($usersEl, stats.users, 1500);
+        }
+      }, 450);
+    }, 500);
+  } catch (error) {
+    console.error("Ошибка загрузки статистики:", error);
+
+    $("#stat-books").text("—");
+    $("#stat-authors").text("—");
+    $("#stat-genres").text("—");
+    $("#stat-users").text("—");
+  }
+}
+
+function observeStatCards() {
+  const $cards = $(".stat-card");
+
+  const observer = new IntersectionObserver(
+    (entries) => {
+      entries.forEach((entry, index) => {
+        if (entry.isIntersecting) {
+          setTimeout(() => {
+            $(entry.target).addClass("animate-fade-in").css({
+              opacity: "1",
+              transform: "translateY(0)",
+            });
+          }, index * 100);
+          observer.unobserve(entry.target);
+        }
+      });
+    },
+    { threshold: 0.1 },
+  );
+
+  $cards.each(function (index, card) {
+    $(card).css({
+      opacity: "0",
+      transform: "translateY(20px)",
+      transition: "opacity 0.5s ease, transform 0.5s ease",
+    });
+    observer.observe(card);
+  });
+}
+
+$(document).ready(() => {
+  loadStats();
+  observeStatCards();
+});