Add /api/pdf route with key/session auth and limits

Adds GET /api/pdf: resolves the caller via a Bearer sbpdf_ API key
(PdfApiKey table) or a Better Auth session cookie, then gates on paid
course access, burst/monthly usage limits, generates the PDF via
generateCleanPdf, records a ToolUsage row, and streams the file with
X-Uses-Count/X-Max-Uses headers. Errors map to 401/403/422/429/504
JSON responses. Whitelists /api/pdf in middleware PUBLIC_ROUTES so the
route can perform its own auth instead of being redirected to /login.

.env.example

@@ -45,3 +45,7 @@ WOW_MOMENT_LESSON_ID="obs-start-l2-006"
 # Obsidian Toolbox (/tools): "true" — показывать точки входа и роуты (staging);
 # не задано/иное — скрыто, /tools редиректит на /dashboard (prod, пока дорабатываем)
 TOOLBOX_VISIBLE=""
+
+# Чистый PDF (browserless на staging/prod; локально — SSH-туннель на staging)
+BROWSER_WS_URL="ws://localhost:3333"
+PDF_MONTHLY_LIMIT="100"

prisma/migrations/20260706120000_add_pdf_api_key/migration.sql

@@ -0,0 +1,14 @@
+-- Чистый PDF — персональный API-ключ студента (Zotero/curl)
+CREATE TABLE "PdfApiKey" (
+    "id" TEXT NOT NULL,
+    "userId" TEXT NOT NULL,
+    "key" TEXT NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+    CONSTRAINT "PdfApiKey_pkey" PRIMARY KEY ("id")
+);
+
+CREATE UNIQUE INDEX "PdfApiKey_userId_key" ON "PdfApiKey"("userId");
+CREATE UNIQUE INDEX "PdfApiKey_key_key" ON "PdfApiKey"("key");
+
+ALTER TABLE "PdfApiKey" ADD CONSTRAINT "PdfApiKey_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;

prisma/schema.prisma

@@ -47,6 +47,7 @@ model User {
   questionMessages     StudentQuestionMessage[]
   wrappedRuns          WrappedRun[]
   toolUsages           ToolUsage[]
+  pdfApiKey            PdfApiKey?
 }
 
 // Obsidian Wrapped — агрегаты прогона (БЕЗ имён/текстов заметок; обработка волта 100% client-side)
@@ -82,6 +83,16 @@ model ToolUsage {
   @@index([createdAt])
 }
 
+// Чистый PDF — персональный API-ключ студента (Zotero/curl)
+model PdfApiKey {
+  id        String   @id @default(cuid())
+  userId    String   @unique
+  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  key       String   @unique // sbpdf_<random>, показывается студенту на /tools/clean-pdf
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+}
+
 model Session {
   id             String   @id @default(cuid())
   userId         String

src/app/api/pdf/route.ts

@@ -0,0 +1,83 @@
+import { NextRequest, NextResponse } from "next/server";
+import { z } from "zod";
+import { auth } from "@/lib/auth";
+import { prisma } from "@/lib/prisma";
+import {
+  BURST_LIMIT, PDF_TOOL_ID, getBurstUsage, getMonthlyLimit, getMonthlyUsage, hasPaidAccess,
+} from "@/lib/clean-pdf/access";
+import { BlockedUrlError } from "@/lib/clean-pdf/ssrf";
+import { EmptyContentError, RenderError, generateCleanPdf } from "@/lib/clean-pdf/generate";
+import { safePdfFilename } from "@/lib/clean-pdf/template";
+import { PDF_KEY_PREFIX } from "@/lib/clean-pdf/api-key";
+
+export const dynamic = "force-dynamic";
+
+const querySchema = z.object({
+  url: z.string().min(1).max(2000),
+  format: z.enum(["A4", "Letter"]).default("A4"),
+  theme: z.enum(["light", "dark"]).default("light"),
+});
+
+function jsonError(status: number, error: string, extra?: Record<string, string>) {
+  return NextResponse.json({ error }, { status, headers: extra });
+}
+
+async function resolveUserId(req: NextRequest): Promise<string | null> {
+  const authHeader = req.headers.get("authorization");
+  if (authHeader?.startsWith("Bearer ")) {
+    const key = authHeader.slice("Bearer ".length).trim();
+    if (!key.startsWith(PDF_KEY_PREFIX)) return null;
+    const record = await prisma.pdfApiKey.findUnique({ where: { key }, select: { userId: true } });
+    return record?.userId ?? null;
+  }
+  const session = await auth.api.getSession({ headers: req.headers });
+  return session?.user.id ?? null;
+}
+
+export async function GET(req: NextRequest) {
+  const userId = await resolveUserId(req);
+  if (!userId) return jsonError(401, "Нужен API-ключ или вход в аккаунт школы");
+
+  if (!(await hasPaidAccess(userId))) {
+    return jsonError(403, "Инструмент доступен студентам платных курсов школы");
+  }
+
+  const parsed = querySchema.safeParse(Object.fromEntries(req.nextUrl.searchParams));
+  if (!parsed.success) return jsonError(422, "Проверьте параметры: url, format (A4|Letter), theme (light|dark)");
+
+  if ((await getBurstUsage(userId)) >= BURST_LIMIT) {
+    return jsonError(429, "Слишком часто: подождите минуту");
+  }
+  const limit = getMonthlyLimit();
+  const used = await getMonthlyUsage(userId);
+  if (used >= limit) {
+    return jsonError(429, `Лимит ${limit} PDF в месяц исчерпан`, {
+      "X-Uses-Count": String(used), "X-Max-Uses": String(limit),
+    });
+  }
+
+  try {
+    const { pdf, title } = await generateCleanPdf(parsed.data);
+    await prisma.toolUsage.create({ data: { userId, tool: PDF_TOOL_ID } });
+
+    const filename = safePdfFilename(title);
+    return new NextResponse(new Uint8Array(pdf), {
+      status: 200,
+      headers: {
+        "Content-Type": "application/pdf",
+        "Content-Disposition": `attachment; filename="document.pdf"; filename*=UTF-8''${encodeURIComponent(filename)}.pdf`,
+        "X-Uses-Count": String(used + 1),
+        "X-Max-Uses": String(limit),
+      },
+    });
+  } catch (e) {
+    if (e instanceof BlockedUrlError || e instanceof EmptyContentError) {
+      return jsonError(422, e.message);
+    }
+    if (e instanceof RenderError) {
+      return jsonError(504, "Не получилось отрендерить страницу, попробуйте позже");
+    }
+    console.error("[clean-pdf]", e);
+    return jsonError(504, "Не получилось сгенерировать PDF, попробуйте позже");
+  }
+}

src/lib/clean-pdf/__tests__/access.test.ts

@@ -0,0 +1,43 @@
+import { describe, expect, it } from "vitest";
+import { decidePaidAccess, monthStartUtc } from "@/lib/clean-pdf/access";
+
+const now = new Date("2026-07-06T10:00:00Z");
+const freeSlug = "obsidian-start";
+
+describe("decidePaidAccess", () => {
+  it("платный enrollment без срока — да", () => {
+    expect(decidePaidAccess({ role: "student", banned: false, freeSlug, now,
+      enrollments: [{ courseSlug: "zotero", expiresAt: null }] })).toBe(true);
+  });
+
+  it("только бесплатный курс — нет", () => {
+    expect(decidePaidAccess({ role: "student", banned: false, freeSlug, now,
+      enrollments: [{ courseSlug: "obsidian-start", expiresAt: null }] })).toBe(false);
+  });
+
+  it("без enrollments — нет", () => {
+    expect(decidePaidAccess({ role: "student", banned: false, freeSlug, now, enrollments: [] })).toBe(false);
+  });
+
+  it("истёкший платный — нет, живой срок — да", () => {
+    expect(decidePaidAccess({ role: "student", banned: false, freeSlug, now,
+      enrollments: [{ courseSlug: "zotero", expiresAt: new Date("2026-01-01") }] })).toBe(false);
+    expect(decidePaidAccess({ role: "student", banned: false, freeSlug, now,
+      enrollments: [{ courseSlug: "zotero", expiresAt: new Date("2027-01-01") }] })).toBe(true);
+  });
+
+  it("admin и curator — да даже без курсов", () => {
+    expect(decidePaidAccess({ role: "admin", banned: false, freeSlug, now, enrollments: [] })).toBe(true);
+    expect(decidePaidAccess({ role: "curator", banned: false, freeSlug, now, enrollments: [] })).toBe(true);
+  });
+
+  it("бан всё перекрывает", () => {
+    expect(decidePaidAccess({ role: "admin", banned: true, freeSlug, now, enrollments: [] })).toBe(false);
+  });
+});
+
+describe("monthStartUtc", () => {
+  it("возвращает первое число месяца 00:00 UTC", () => {
+    expect(monthStartUtc(new Date("2026-07-06T23:59:59Z")).toISOString()).toBe("2026-07-01T00:00:00.000Z");
+  });
+});

src/lib/clean-pdf/__tests__/api-key.test.ts

@@ -0,0 +1,15 @@
+import { describe, expect, it } from "vitest";
+import { PDF_KEY_PREFIX, generatePdfKey } from "@/lib/clean-pdf/api-key";
+
+describe("generatePdfKey", () => {
+  it("формат sbpdf_<base64url>, достаточная длина", () => {
+    const key = generatePdfKey();
+    expect(key.startsWith(PDF_KEY_PREFIX)).toBe(true);
+    expect(key.length).toBeGreaterThanOrEqual(PDF_KEY_PREFIX.length + 32);
+    expect(key.slice(PDF_KEY_PREFIX.length)).toMatch(/^[A-Za-z0-9_-]+$/);
+  });
+
+  it("две генерации различаются", () => {
+    expect(generatePdfKey()).not.toBe(generatePdfKey());
+  });
+});

src/lib/clean-pdf/__tests__/generate.int.test.ts

@@ -0,0 +1,17 @@
+import { describe, expect, it } from "vitest";
+import { generateCleanPdf } from "@/lib/clean-pdf/generate";
+
+const enabled = process.env.RUN_PDF_INTEGRATION === "1";
+
+describe.runIf(enabled)("generateCleanPdf (integration, нужен browserless)", () => {
+  it("генерирует PDF реальной статьи", async () => {
+    const { pdf, title } = await generateCleanPdf({
+      url: "https://habr.com/ru/articles/942236/",
+      format: "A4",
+      theme: "light",
+    });
+    expect(pdf.length).toBeGreaterThan(20_000);
+    expect(pdf.subarray(0, 5).toString()).toBe("%PDF-");
+    expect(title.length).toBeGreaterThan(3);
+  }, 120_000);
+});

src/lib/clean-pdf/__tests__/ssrf.test.ts

@@ -0,0 +1,70 @@
+import { describe, expect, it } from "vitest";
+import { BlockedUrlError, assertPublicUrl, isPrivateAddress } from "@/lib/clean-pdf/ssrf";
+
+describe("isPrivateAddress", () => {
+  const privateIps = [
+    "127.0.0.1", "0.0.0.0", "10.1.2.3", "100.64.0.1", "169.254.169.254",
+    "172.16.0.1", "172.31.255.255", "192.168.1.1", "192.0.0.8", "198.18.0.1",
+    "224.0.0.1", "255.255.255.255",
+    "::1", "::", "fc00::1", "fd12:3456::1", "fe80::1", "::ffff:10.0.0.1", "::ffff:127.0.0.1",
+    "::ffff:7f00:1", "::ffff:a00:1", "::ffff:c0a8:101", "::ffff:a9fe:a9fe",
+  ];
+  const publicIps = ["93.184.216.34", "8.8.8.8", "172.32.0.1", "2606:2800:220:1::1", "::ffff:8.8.8.8", "::ffff:808:808"];
+
+  it.each(privateIps)("блокирует %s", (ip) => expect(isPrivateAddress(ip)).toBe(true));
+  it.each(publicIps)("пропускает %s", (ip) => expect(isPrivateAddress(ip)).toBe(false));
+});
+
+describe("assertPublicUrl", () => {
+  const publicResolve = async () => [{ address: "93.184.216.34", family: 4 }];
+  const privateResolve = async () => [{ address: "172.18.0.2", family: 4 }];
+  const mixedResolve = async () => [
+    { address: "93.184.216.34", family: 4 },
+    { address: "10.0.0.5", family: 4 },
+  ];
+
+  it("пропускает публичный https-URL", async () => {
+    const url = await assertPublicUrl("https://example.com/article", publicResolve);
+    expect(url.hostname).toBe("example.com");
+  });
+
+  it.each([
+    "file:///etc/passwd",
+    "ftp://example.com/x",
+    "chrome://settings",
+    "not a url",
+  ])("блокирует %s", async (raw) => {
+    await expect(assertPublicUrl(raw, publicResolve)).rejects.toThrow(BlockedUrlError);
+  });
+
+  it("блокирует localhost и .local без резолва", async () => {
+    await expect(assertPublicUrl("http://localhost:3000/x", publicResolve)).rejects.toThrow(BlockedUrlError);
+    await expect(assertPublicUrl("http://printer.local/x", publicResolve)).rejects.toThrow(BlockedUrlError);
+  });
+
+  it("блокирует литеральный приватный IP", async () => {
+    await expect(assertPublicUrl("http://192.168.1.1/admin", publicResolve)).rejects.toThrow(BlockedUrlError);
+    await expect(assertPublicUrl("http://[::1]:8080/", publicResolve)).rejects.toThrow(BlockedUrlError);
+  });
+
+  it("блокирует хост, резолвящийся в приватный IP (включая частично)", async () => {
+    await expect(assertPublicUrl("https://evil.example/x", privateResolve)).rejects.toThrow(BlockedUrlError);
+    await expect(assertPublicUrl("https://evil.example/x", mixedResolve)).rejects.toThrow(BlockedUrlError);
+  });
+
+  it("блокирует хост, который не резолвится", async () => {
+    const failResolve = async () => { throw new Error("ENOTFOUND"); };
+    await expect(assertPublicUrl("https://nope.example/x", failResolve)).rejects.toThrow(BlockedUrlError);
+  });
+
+  it("блокирует v4-mapped IPv6 в bracket-нотации (SSRF-обход)", async () => {
+    for (const raw of [
+      "http://[::ffff:127.0.0.1]/",
+      "http://[::ffff:10.0.0.1]/",
+      "http://[::ffff:169.254.169.254]/",
+      "http://[::ffff:192.168.1.1]/",
+    ]) {
+      await expect(assertPublicUrl(raw, publicResolve)).rejects.toThrow(BlockedUrlError);
+    }
+  });
+});

src/lib/clean-pdf/__tests__/template.test.ts

@@ -0,0 +1,59 @@
+import { describe, expect, it } from "vitest";
+import { buildCleanHtml, safePdfFilename } from "@/lib/clean-pdf/template";
+
+const base = {
+  title: "Заголовок статьи",
+  url: "https://example.com/article",
+  theme: "light" as const,
+};
+
+describe("buildCleanHtml", () => {
+  it("экранирует HTML в метаполях", () => {
+    const html = buildCleanHtml({ ...base, title: `<script>alert(1)</script>`, contentHtml: "<p>ок</p>" });
+    expect(html).not.toContain("<script>alert(1)</script>");
+    expect(html).toContain("&lt;script&gt;");
+  });
+
+  it("вставляет контент и шапку", () => {
+    const html = buildCleanHtml({ ...base, author: "Автор", site: "Example", contentHtml: "<p>Текст статьи</p>" });
+    expect(html).toContain("<p>Текст статьи</p>");
+    expect(html).toContain("Заголовок статьи");
+    expect(html).toContain("Автор");
+    expect(html).toContain("https://example.com/article");
+  });
+
+  it("строит оглавление при 3+ заголовках и проставляет якоря", () => {
+    const content = "<h2>Один</h2><p>a</p><h2>Два</h2><p>b</p><h3>Три</h3><p>c</p>";
+    const html = buildCleanHtml({ ...base, contentHtml: content });
+    expect(html).toContain("Содержание");
+    expect(html).toMatch(/<h2 id="[^"]+">Один<\/h2>/);
+    expect((html.match(/class="toc-item/g) ?? []).length).toBe(3);
+  });
+
+  it("не строит оглавление при <3 заголовках", () => {
+    const html = buildCleanHtml({ ...base, contentHtml: "<h2>Один</h2><p>a</p>" });
+    expect(html).not.toContain("Содержание");
+  });
+
+  it("уникализирует одинаковые якоря", () => {
+    const content = "<h2>Раздел</h2><h2>Раздел</h2><h2>Раздел</h2>";
+    const html = buildCleanHtml({ ...base, contentHtml: content });
+    const ids = [...html.matchAll(/<h2 id="([^"]+)"/g)].map((m) => m[1]);
+    expect(new Set(ids).size).toBe(3);
+  });
+
+  it("переключает тёмную тему", () => {
+    const light = buildCleanHtml({ ...base, contentHtml: "<p>x</p>" });
+    const dark = buildCleanHtml({ ...base, theme: "dark", contentHtml: "<p>x</p>" });
+    expect(light).toContain('data-theme="light"');
+    expect(dark).toContain('data-theme="dark"');
+  });
+});
+
+describe("safePdfFilename", () => {
+  it("убирает опасные символы и ограничивает длину", () => {
+    expect(safePdfFilename('Статья: как/не\\надо "делать"?')).toBe("Статья_ как_не_надо _делать_");
+    expect(safePdfFilename("")).toBe("document");
+    expect(safePdfFilename("a".repeat(300)).length).toBeLessThanOrEqual(140);
+  });
+});

src/lib/clean-pdf/__tests__/zotero-script.test.ts

@@ -0,0 +1,12 @@
+import { describe, expect, it } from "vitest";
+import { buildZoteroScript } from "@/lib/clean-pdf/zotero-script";
+
+describe("buildZoteroScript", () => {
+  it("подставляет ключ и адрес школы", () => {
+    const s = buildZoteroScript({ apiKey: "sbpdf_test123", baseUrl: "https://school.second-brain.ru" });
+    expect(s).toContain("'sbpdf_test123'");
+    expect(s).toContain("'https://school.second-brain.ru'");
+    expect(s).toContain("/api/pdf?url=");
+    expect(s).not.toContain("YOUR_KEY");
+  });
+});

src/lib/clean-pdf/access.ts

@@ -0,0 +1,60 @@
+import { prisma } from "@/lib/prisma";
+
+// НЕ "clean-pdf": так CopyButton логирует копирования — они не должны тратить лимит
+export const PDF_TOOL_ID = "clean-pdf-generate";
+export const BURST_LIMIT = 5; // успешных генераций в минуту
+const BURST_WINDOW_MS = 60_000;
+
+export function decidePaidAccess(input: {
+  role: string;
+  banned: boolean;
+  enrollments: { courseSlug: string; expiresAt: Date | null }[];
+  freeSlug: string;
+  now?: Date;
+}): boolean {
+  const now = input.now ?? new Date();
+  if (input.banned) return false;
+  if (input.role === "admin" || input.role === "curator") return true;
+  return input.enrollments.some(
+    (e) => e.courseSlug !== input.freeSlug && (e.expiresAt === null || e.expiresAt > now),
+  );
+}
+
+export async function hasPaidAccess(userId: string): Promise<boolean> {
+  const user = await prisma.user.findUnique({
+    where: { id: userId },
+    select: {
+      role: true,
+      banned: true,
+      enrollments: { select: { expiresAt: true, course: { select: { slug: true } } } },
+    },
+  });
+  if (!user) return false;
+  return decidePaidAccess({
+    role: user.role,
+    banned: user.banned ?? false,
+    freeSlug: process.env.FREE_COURSE_SLUG ?? "obsidian-start",
+    enrollments: user.enrollments.map((e) => ({ courseSlug: e.course.slug, expiresAt: e.expiresAt })),
+  });
+}
+
+export function monthStartUtc(now: Date): Date {
+  return new Date(Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), 1));
+}
+
+export function getMonthlyLimit(): number {
+  const n = Number(process.env.PDF_MONTHLY_LIMIT);
+  return Number.isFinite(n) && n > 0 ? n : 100;
+}
+
+export async function getMonthlyUsage(userId: string): Promise<number> {
+  return prisma.toolUsage.count({
+    where: { userId, tool: PDF_TOOL_ID, createdAt: { gte: monthStartUtc(new Date()) } },
+  });
+}
+
+export async function getBurstUsage(userId: string): Promise<number> {
+  return prisma.toolUsage.count({
+    where: { userId, tool: PDF_TOOL_ID, createdAt: { gte: new Date(Date.now() - BURST_WINDOW_MS) } },
+  });
+}

src/lib/clean-pdf/api-key.ts

@@ -0,0 +1,7 @@
+import { randomBytes } from "node:crypto";
+
+export const PDF_KEY_PREFIX = "sbpdf_";
+
+export function generatePdfKey(): string {
+  return PDF_KEY_PREFIX + randomBytes(24).toString("base64url");
+}

src/lib/clean-pdf/generate.ts

@@ -0,0 +1,139 @@
+import { isIP } from "node:net";
+import { chromium } from "playwright-core";
+import { JSDOM } from "jsdom";
+import { Defuddle } from "defuddle/node";
+import { assertPublicUrl, isPrivateAddress } from "@/lib/clean-pdf/ssrf";
+import { buildCleanHtml } from "@/lib/clean-pdf/template";
+
+export class EmptyContentError extends Error {}
+export class RenderError extends Error {}
+
+/**
+ * Оборачивает промис в app-level таймаут: если `p` не завершится за `ms`,
+ * гонка завершится отказом с RenderError, и внешний `finally` (browser.close())
+ * освободит слот browserless вместо того, чтобы держать его до зависшего вызова.
+ */
+function withTimeout<T>(p: Promise<T>, ms: number, message: string): Promise<T> {
+  let timer: ReturnType<typeof setTimeout>;
+  const guard = new Promise<never>((_, reject) => {
+    timer = setTimeout(() => reject(new RenderError(message)), ms);
+    timer.unref?.();
+  });
+  return Promise.race([p, guard]).finally(() => clearTimeout(timer)) as Promise<T>;
+}
+
+const GOTO_TIMEOUT_MS = 30_000;
+const SETTLE_TIMEOUT_MS = 10_000;
+const PDF_TIMEOUT_MS = 30_000;
+const UA =
+  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0 Safari/537.36";
+
+function browserWsUrl(): string {
+  const base = process.env.BROWSER_WS_URL;
+  if (!base) throw new RenderError("BROWSER_WS_URL не задан");
+  const token = process.env.BROWSERLESS_TOKEN;
+  return token ? `${base}${base.includes("?") ? "&" : "?"}token=${token}` : base;
+}
+
+export async function generateCleanPdf(opts: {
+  url: string;
+  format: "A4" | "Letter";
+  theme: "light" | "dark";
+}): Promise<{ pdf: Buffer; title: string }> {
+  const target = await assertPublicUrl(opts.url);
+
+  const browser = await chromium.connectOverCDP(browserWsUrl()).catch((e) => {
+    throw new RenderError(`Браузер недоступен: ${e.message}`);
+  });
+
+  try {
+    const context = await browser.newContext({ userAgent: UA, viewport: { width: 1280, height: 800 } });
+    // Вторая линия SSRF-обороны: страница не может дёргать приватные адреса
+    // (литеральные IP и localhost; hostnames уже проверены до goto).
+    await context.route("**/*", (route) => {
+      try {
+        const u = new URL(route.request().url());
+        const host = u.hostname.replace(/^\[|\]$/g, "").replace(/\.$/, "");
+        if (
+          (u.protocol !== "http:" && u.protocol !== "https:") ||
+          host === "localhost" || host.endsWith(".local") || host.endsWith(".internal") ||
+          (isIP(host) !== 0 && isPrivateAddress(host))
+        ) {
+          return route.abort();
+        }
+      } catch {
+        return route.abort();
+      }
+      return route.continue();
+    });
+
+    // context.route НЕ перехватывает WebSocket — отдельная защита от SSRF через ws://
+    await context.routeWebSocket("**/*", (ws) => {
+      try {
+        const u = new URL(ws.url());
+        const host = u.hostname.replace(/^\[|\]$/g, "").replace(/\.$/, "");
+        if (
+          (u.protocol !== "ws:" && u.protocol !== "wss:") ||
+          host === "localhost" || host.endsWith(".local") || host.endsWith(".internal") ||
+          (isIP(host) !== 0 && isPrivateAddress(host))
+        ) {
+          ws.close();
+          return;
+        }
+      } catch {
+        ws.close();
+        return;
+      }
+      ws.connectToServer();
+    });
+
+    const page = await context.newPage();
+    await page.goto(target.href, { waitUntil: "domcontentloaded", timeout: GOTO_TIMEOUT_MS }).catch((e) => {
+      throw new RenderError(`Страница не открылась: ${e.message}`);
+    });
+    await page.waitForLoadState("networkidle", { timeout: SETTLE_TIMEOUT_MS }).catch(() => {});
+
+    const rawHtml = await page.content();
+    const pageTitle = await page.title().catch(() => "");
+
+    const dom = new JSDOM(rawHtml, { url: target.href });
+    const article = await Defuddle(dom.window.document, target.href);
+    // DefuddleResponse (node_modules/defuddle/dist/types.d.ts) типизирует
+    // content/title/author/site/domain/wordCount как обязательные (не optional) поля —
+    // сам объект тоже не nullable (Defuddle() не возвращает null/undefined).
+    // Отсутствие контента выражается пустой строкой/нулевым wordCount, не отсутствием поля.
+    if (!article.content || article.wordCount < 10) {
+      throw new EmptyContentError("Не удалось выделить содержимое страницы");
+    }
+
+    const title = article.title || pageTitle || target.hostname;
+    const cleanHtml = buildCleanHtml({
+      title,
+      author: article.author || undefined,
+      site: article.site || article.domain || undefined,
+      url: target.href,
+      contentHtml: article.content,
+      theme: opts.theme,
+    });
+
+    const pdfPage = await context.newPage();
+    await pdfPage.setContent(cleanHtml, { waitUntil: "networkidle", timeout: SETTLE_TIMEOUT_MS }).catch(() => {});
+    // page.pdf() в playwright-core не принимает опцию timeout (проверено по
+    // node_modules/playwright-core/types/types.d.ts) и не имеет implicit-бага —
+    // оборачиваем в app-level withTimeout, чтобы зависание всё же дошло до
+    // finally (browser.close()) и не держало CONCURRENT-слот browserless.
+    const pdf = await withTimeout(
+      pdfPage.pdf({
+        format: opts.format,
+        printBackground: true,
+        margin: { top: "15mm", bottom: "18mm", left: "15mm", right: "15mm" },
+      }),
+      PDF_TIMEOUT_MS,
+      "Печать PDF не завершилась вовремя",
+    );
+
+    return { pdf, title };
+  } finally {
+    await browser.close().catch(() => {});
+  }
+}

src/lib/clean-pdf/keys.ts

@@ -0,0 +1,23 @@
+import { prisma } from "@/lib/prisma";
+import { generatePdfKey } from "@/lib/clean-pdf/api-key";
+
+export async function getOrCreatePdfKey(userId: string): Promise<string> {
+  const existing = await prisma.pdfApiKey.findUnique({ where: { userId } });
+  if (existing) return existing.key;
+  const created = await prisma.pdfApiKey.upsert({
+    where: { userId },
+    create: { userId, key: generatePdfKey() },
+    update: {},
+  });
+  return created.key;
+}
+
+export async function regenerateKey(userId: string): Promise<string> {
+  const key = generatePdfKey();
+  await prisma.pdfApiKey.upsert({
+    where: { userId },
+    create: { userId, key },
+    update: { key },
+  });
+  return key;
+}

src/lib/clean-pdf/ssrf.ts

@@ -0,0 +1,119 @@
+import { lookup } from "node:dns/promises";
+import { isIP } from "node:net";
+
+export class BlockedUrlError extends Error {}
+
+export type LookupFn = (
+  hostname: string,
+  opts: { all: true },
+) => Promise<{ address: string; family: number }[]>;
+
+function v4ToInt(ip: string): number {
+  return ip.split(".").reduce((acc, o) => acc * 256 + Number(o), 0);
+}
+
+// [начало включительно, конец включительно] в виде 32-битных чисел
+const V4_PRIVATE: Array<[number, number]> = [
+  ["0.0.0.0", "0.255.255.255"],       // "this network"
+  ["10.0.0.0", "10.255.255.255"],     // RFC1918
+  ["100.64.0.0", "100.127.255.255"],  // CGNAT
+  ["127.0.0.0", "127.255.255.255"],   // loopback
+  ["169.254.0.0", "169.254.255.255"], // link-local / cloud metadata
+  ["172.16.0.0", "172.31.255.255"],   // RFC1918 (docker-сети попадают сюда)
+  ["192.0.0.0", "192.0.0.255"],       // IETF protocol assignments
+  ["192.168.0.0", "192.168.255.255"], // RFC1918
+  ["198.18.0.0", "198.19.255.255"],   // benchmarking
+  ["224.0.0.0", "255.255.255.255"],   // multicast + reserved + broadcast
+].map(([a, b]) => [v4ToInt(a), v4ToInt(b)] as [number, number]);
+
+function isPrivateV4(ip: string): boolean {
+  const n = v4ToInt(ip);
+  return V4_PRIVATE.some(([lo, hi]) => n >= lo && n <= hi);
+}
+
+/** Разворачивает IPv6 (в т.ч. сжатый `::` и v4-mapped/embedded dotted) в 8 групп по 16 бит. */
+function expandV6(ip: string): number[] | null {
+  let s = ip.toLowerCase();
+
+  // Встроенный dotted-хвост (::ffff:127.0.0.1, ::127.0.0.1) → в hex-группы
+  const dotted = s.match(/(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$/);
+  if (dotted) {
+    if (isIP(dotted[1]) !== 4) return null;
+    const n = v4ToInt(dotted[1]);
+    s = s.slice(0, dotted.index) + ((n >>> 16) & 0xffff).toString(16) + ":" + (n & 0xffff).toString(16);
+  }
+
+  const halves = s.split("::");
+  if (halves.length > 2) return null;
+  const head = halves[0] ? halves[0].split(":") : [];
+  const tail = halves.length === 2 ? (halves[1] ? halves[1].split(":") : []) : [];
+
+  let groups: string[];
+  if (halves.length === 2) {
+    const missing = 8 - head.length - tail.length;
+    if (missing < 0) return null;
+    groups = [...head, ...Array(missing).fill("0"), ...tail];
+  } else {
+    groups = head;
+  }
+  if (groups.length !== 8) return null;
+
+  const nums = groups.map((g) => (g === "" ? 0 : parseInt(g, 16)));
+  if (nums.some((x) => Number.isNaN(x) || x < 0 || x > 0xffff)) return null;
+  return nums;
+}
+
+export function isPrivateAddress(ip: string): boolean {
+  if (isIP(ip) === 4) return isPrivateV4(ip);
+  if (isIP(ip) !== 6) return true; // не IP — не пропускаем
+
+  const groups = expandV6(ip);
+  if (!groups) return true; // не смогли разобрать v6 — не пропускаем
+
+  // ::/96 (v4-compatible, вкл. :: и ::1) и ::ffff:0:0/96 (v4-mapped):
+  // младшие 32 бита содержат IPv4 — проверяем его напрямую.
+  const firstFiveZero = groups.slice(0, 5).every((g) => g === 0);
+  if (firstFiveZero && (groups[5] === 0 || groups[5] === 0xffff)) {
+    const v4num = groups[6] * 0x10000 + groups[7];
+    const dottedV4 = `${(v4num >>> 24) & 255}.${(v4num >>> 16) & 255}.${(v4num >>> 8) & 255}.${v4num & 255}`;
+    return isPrivateV4(dottedV4);
+  }
+
+  const first = groups[0];
+  if (first >= 0xfc00 && first <= 0xfdff) return true; // fc00::/7 (ULA)
+  if (first >= 0xfe80 && first <= 0xfebf) return true; // fe80::/10 (link-local)
+  return false;
+}
+
+export async function assertPublicUrl(raw: string, resolve: LookupFn = lookup): Promise<URL> {
+  let url: URL;
+  try {
+    url = new URL(raw);
+  } catch {
+    throw new BlockedUrlError("Некорректный URL");
+  }
+  if (url.protocol !== "http:" && url.protocol !== "https:") {
+    throw new BlockedUrlError("Поддерживаются только http и https");
+  }
+
+  const hostname = url.hostname.replace(/^\[|\]$/g, "").replace(/\.$/, ""); // [::1] → ::1
+  if (hostname === "localhost" || hostname.endsWith(".local") || hostname.endsWith(".internal")) {
+    throw new BlockedUrlError("Адрес недоступен");
+  }
+
+  if (isIP(hostname)) {
+    if (isPrivateAddress(hostname)) throw new BlockedUrlError("Адрес недоступен");
+    return url;
+  }
+
+  let addresses: { address: string; family: number }[];
+  try {
+    addresses = await resolve(hostname, { all: true });
+  } catch {
+    throw new BlockedUrlError("Не удалось определить адрес сайта");
+  }
+  if (addresses.length === 0 || addresses.some((a) => isPrivateAddress(a.address))) {
+    throw new BlockedUrlError("Адрес недоступен");
+  }
+  return url;
+}

src/lib/clean-pdf/template.ts

@@ -0,0 +1,107 @@
+import { JSDOM } from "jsdom";
+
+export interface CleanArticle {
+  title: string;
+  author?: string;
+  site?: string;
+  url: string;
+  contentHtml: string;
+  theme: "light" | "dark";
+}
+
+function escapeHtml(s: string): string {
+  return s
+    .replace(/&/g, "&")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;");
+}
+
+export function safePdfFilename(title: string): string {
+  const cleaned = title.replace(/[\\/:"*?<>|\n\r]+/g, "_").trim().slice(0, 140);
+  return cleaned || "document";
+}
+
+interface TocEntry { id: string; text: string; level: 2 | 3 }
+
+/** Проставляет id заголовкам h2/h3 и возвращает контент + записи оглавления. */
+function prepareContent(contentHtml: string): { html: string; toc: TocEntry[] } {
+  const dom = new JSDOM(`<body>${contentHtml}</body>`);
+  const doc = dom.window.document;
+  const used = new Set<string>();
+  const toc: TocEntry[] = [];
+
+  doc.querySelectorAll("h2, h3").forEach((h) => {
+    const text = (h.textContent ?? "").trim();
+    if (!text) return;
+    let id = text.toLowerCase().replace(/[^\p{L}\p{N}]+/gu, "-").replace(/^-+|-+$/g, "") || "section";
+    let i = 2;
+    while (used.has(id)) id = `${id}-${i++}`;
+    used.add(id);
+    h.id = id;
+    toc.push({ id, text, level: h.tagName === "H2" ? 2 : 3 });
+  });
+
+  return { html: doc.body.innerHTML, toc };
+}
+
+const CSS = `
+  :root[data-theme="light"] { --bg: #faf7f0; --fg: #1f1d1a; --muted: #6b6459; --line: #d8d2c4; --accent: #7a2e2e; }
+  :root[data-theme="dark"]  { --bg: #201e1b; --fg: #e8e4dc; --muted: #a39b8d; --line: #3d3a34; --accent: #d4a0a0; }
+  * { box-sizing: border-box; }
+  body { background: var(--bg); color: var(--fg); font-family: Georgia, "Times New Roman", serif;
+         font-size: 12.5pt; line-height: 1.65; margin: 0; }
+  main { max-width: 100%; }
+  h1 { font-size: 22pt; line-height: 1.25; margin: 0 0 6pt; }
+  h2 { font-size: 16pt; margin: 20pt 0 8pt; }
+  h3 { font-size: 13.5pt; margin: 16pt 0 6pt; }
+  p { margin: 0 0 9pt; }
+  a { color: var(--accent); text-decoration: none; }
+  img, video, iframe { max-width: 100%; height: auto; }
+  pre { background: rgba(127,127,127,.08); border: 1px solid var(--line); padding: 8pt;
+        overflow-x: hidden; white-space: pre-wrap; word-wrap: break-word;
+        font-family: "SF Mono", Menlo, Consolas, monospace; font-size: 9.5pt; }
+  code { font-family: "SF Mono", Menlo, Consolas, monospace; font-size: 0.9em; }
+  blockquote { border-left: 3px solid var(--line); margin: 0 0 9pt; padding: 2pt 0 2pt 12pt; color: var(--muted); }
+  table { border-collapse: collapse; width: 100%; font-size: 10.5pt; }
+  th, td { border: 1px solid var(--line); padding: 4pt 6pt; text-align: left; }
+  figure { margin: 0 0 9pt; } figcaption { color: var(--muted); font-size: 9.5pt; }
+  .meta { color: var(--muted); font-size: 10pt; margin-bottom: 4pt; }
+  .meta a { color: var(--muted); }
+  .head-rule { border: 0; border-top: 1px solid var(--line); margin: 12pt 0 16pt; }
+  .toc { border: 1px solid var(--line); padding: 10pt 14pt; margin: 0 0 16pt; }
+  .toc-title { font-weight: bold; margin-bottom: 6pt; }
+  .toc-item { display: block; margin: 2pt 0; }
+  .toc-item.lvl3 { padding-left: 14pt; font-size: 0.92em; }
+  h2, h3 { break-after: avoid; } pre, blockquote, figure, table { break-inside: avoid; }
+`;
+
+export function buildCleanHtml(article: CleanArticle): string {
+  const { html, toc } = prepareContent(article.contentHtml);
+  const metaParts = [article.site, article.author].filter(Boolean).map((s) => escapeHtml(s!));
+
+  const tocHtml = toc.length >= 3
+    ? `<nav class="toc"><div class="toc-title">Содержание</div>${toc
+        .map((t) => `<a class="toc-item lvl${t.level}" href="#${t.id}">${escapeHtml(t.text)}</a>`)
+        .join("")}</nav>`
+    : "";
+
+  return `<!DOCTYPE html>
+<html lang="ru" data-theme="${article.theme}">
+<head>
+<meta charset="utf-8">
+<title>${escapeHtml(article.title)}</title>
+<style>${CSS}</style>
+</head>
+<body>
+<main>
+  <h1>${escapeHtml(article.title)}</h1>
+  ${metaParts.length ? `<div class="meta">${metaParts.join(" · ")}</div>` : ""}
+  <div class="meta"><a href="${escapeHtml(article.url)}">${escapeHtml(article.url)}</a></div>
+  <hr class="head-rule">
+  ${tocHtml}
+  ${html}
+</main>
+</body>
+</html>`;
+}

src/lib/clean-pdf/zotero-script.ts

@@ -0,0 +1,80 @@
+// Адаптация скрипта Clean PDF (pdf.brainysnipe.ru/zotero-script.js) под школу.
+export function buildZoteroScript({ apiKey, baseUrl }: { apiKey: string; baseUrl: string }): string {
+  return `// ── Настройки ──────────────────────────────────────────────────────────────
+const API_KEY     = '${apiKey}'; // персональный ключ из school.second-brain.ru/tools/clean-pdf
+const SERVICE_URL = '${baseUrl}';
+const FORMAT      = 'A4';    // 'A4' или 'Letter'
+const THEME       = 'light'; // 'light' или 'dark'
+// ───────────────────────────────────────────────────────────────────────────
+
+if (typeof item === "undefined" || !item) return;
+(async function () {
+  let tempFilePath = null;
+  try {
+    function joinPath(dir, filename) {
+      if (typeof OS !== "undefined" && OS.Path && OS.Path.join) return OS.Path.join(dir, filename);
+      const separator = dir.includes("\\\\") ? "\\\\" : "/";
+      return dir.replace(/[\\\\/]+$/, "") + separator + filename;
+    }
+
+    let targetItem = item;
+    if (!targetItem.isRegularItem()) {
+      if (targetItem.isAttachment() || targetItem.isNote())
+        targetItem = Zotero.Items.get(targetItem.parentID);
+    }
+    if (!targetItem?.isRegularItem()) {
+      Zotero.alert(null, "Чистый PDF", "Выберите обычную запись Zotero.");
+      return;
+    }
+    const url = targetItem.getField("url");
+    if (!url) { Zotero.alert(null, "Чистый PDF", "У записи нет URL."); return; }
+
+    const pw = new Zotero.ProgressWindow();
+    pw.changeHeadline("Чистый PDF");
+    const progress = new pw.ItemProgress(targetItem.getImageSrc(), targetItem.getField("title"));
+    pw.show();
+    pw.addDescription("Генерируем PDF…");
+
+    const response = await Zotero.getMainWindow().fetch(
+      SERVICE_URL + "/api/pdf?url=" + encodeURIComponent(url) + "&format=" + FORMAT + "&theme=" + THEME,
+      { headers: { 'Authorization': 'Bearer ' + API_KEY } }
+    );
+    if (!response.ok) {
+      const body = await response.json().catch(() => ({}));
+      progress.setError();
+      pw.addDescription("Ошибка: " + (body.error || ("HTTP " + response.status)));
+      pw.startCloseTimer(8000);
+      return;
+    }
+
+    const uint8Array = new Uint8Array(await (await response.blob()).arrayBuffer());
+    if (uint8Array.length < 1000) {
+      progress.setError(); pw.addDescription("Пришёл пустой PDF."); pw.startCloseTimer(8000); return;
+    }
+
+    const safeTitle = (targetItem.getField("title") || "Document").replace(/[\\\\/:"*?<>|]+/g, "_").slice(0, 140);
+    tempFilePath = joinPath(Zotero.getTempDirectory().path, safeTitle + ".pdf");
+    await Zotero.getMainWindow().IOUtils.write(tempFilePath, uint8Array);
+    await Zotero.Attachments.importFromFile({ file: tempFilePath, parentItemID: targetItem.id, contentType: "application/pdf" });
+
+    for (const attId of targetItem.getAttachments()) {
+      const att = Zotero.Items.get(attId);
+      const ct = att?.attachmentContentType || "";
+      if (ct === "text/html" || ct === "application/zip") await att.eraseTx();
+    }
+
+    progress.setProgress(100);
+    const usesCount = response.headers.get('X-Uses-Count');
+    const maxUses   = response.headers.get('X-Max-Uses');
+    const usageInfo = (usesCount && maxUses) ? (" (" + usesCount + "/" + maxUses + " за месяц)") : "";
+    pw.addDescription("PDF прикреплён." + usageInfo);
+    pw.startCloseTimer(4000);
+  } catch (e) {
+    Zotero.alert(null, "Ошибка", e.toString());
+  } finally {
+    if (tempFilePath) {
+      await Zotero.getMainWindow().IOUtils.remove(tempFilePath, { ignoreAbsent: true }).catch(() => {});
+    }
+  }
+})();`;
+}

src/middleware.ts

@@ -1,7 +1,7 @@
 import { NextRequest, NextResponse } from "next/server";
 import { getSessionCookie } from "better-auth/cookies";
 
-const PUBLIC_ROUTES = ["/login", "/register", "/verify-email", "/forgot-password", "/reset-password", "/api/auth", "/api/register", "/api/internal", "/maintenance", "/share/wrapped"];
+const PUBLIC_ROUTES = ["/login", "/register", "/verify-email", "/forgot-password", "/reset-password", "/api/auth", "/api/register", "/api/internal", "/api/pdf", "/maintenance", "/share/wrapped"];
 
 export function middleware(request: NextRequest) {
   const { pathname } = request.nextUrl;