.env.example

@@ -16,6 +16,8 @@ SMTP_MAIL_FROM=noreply@example.com # Email отправителя
 
 # === Безопасность ===
 API_PASS=your_secure_password_here # Пароль для доступа к API (используйте сложный!)
+JWT_SECRET=your_long_random_jwt_secret # Секрет подписи JWT для админ-панели
+ADMIN_SESSION_HOURS=12             # Срок действия JWT-сессии админа в часах
 PORT=3000                          # Порт, на котором будет работать сервер
 HOST=0.0.0.0                       # Хост для облачного деплоя
 FNS_TIMEOUT_MS=30000               # Таймаут создания чека в ФНС

.gitignore

@@ -47,4 +47,6 @@ build/
 !README.md
 !README.MD
 !server.js
+!public/
+!public/**
 !LICENSE

README.MD

@@ -12,6 +12,26 @@ npm start
 
 Сервис запустится на порту из `PORT` или на `4000` по умолчанию.
 
+Админ-интерфейс доступен по адресу:
+
+```http
+GET /admin
+```
+
+Для входа используется значение `API_PASS`. Через интерфейс можно смотреть локальный журнал чеков, синхронизировать последние чеки из кабинета ФНС, создавать чек вручную, проверять ФНС/SMTP и менять параметры сервиса без отдельного фронтенд-фреймворка.
+
+Swagger UI доступен по адресу:
+
+```http
+GET /swagger
+```
+
+OpenAPI JSON доступен по адресу:
+
+```http
+GET /openapi.json
+```
+
 ## Docker
 
 Сборка образа:
@@ -42,13 +62,19 @@ SMTP_USER=noreply@example.com
 SMTP_PASS=email_app_password
 SMTP_MAIL_FROM=noreply@example.com
 API_PASS=strong_api_password
+JWT_SECRET=long_random_jwt_secret
+ADMIN_SESSION_HOURS=12
 PORT=3000
 HOST=0.0.0.0
 FNS_TIMEOUT_MS=30000
 SMTP_TIMEOUT_MS=15000
 ```
 
-`API_PASS` должен совпадать с `api_pass` в запросах к `POST /api/v1/create-receipt`.
+`API_PASS` используется как пароль входа в админ-панель и должен совпадать с `api_pass` в старых запросах к `POST /api/v1/create-receipt`. После входа UI получает JWT и дальше отправляет запросы с `Authorization: Bearer <token>`.
+
+`JWT_SECRET` лучше задавать отдельно от `API_PASS`. Если `JWT_SECRET` не задан, сервис подпишет JWT через `API_PASS`, но для продакшена это менее удобно при ротации пароля.
+
+Настройки, измененные через UI, сохраняются в `data/config.json` и перекрывают значения из `.env`. Сетевые параметры `PORT` и `HOST` применятся после перезапуска процесса.
 
 ## Timeweb Cloud
 
@@ -94,3 +120,5 @@ Content-Type: application/json
 Поле `email` обязательно: на этот адрес сервис отправит письмо со ссылкой на чек после успешного создания чека в ФНС.
 
 Если чек создан в ФНС, но письмо клиенту не отправилось, API вернет `success: true`, `receiptCreated: true`, `emailSent: false`, `receiptId`, `printLink` и `technicalError`. Ошибка отправки сохранится в `error.json`.
+
+Все успешно созданные чеки сохраняются в локальный журнал `data/receipts.json`, чтобы в UI была связь между чеком, email пользователя и позициями заказа. Синхронизация с ФНС подтягивает последние чеки из кабинета, но для старых чеков, созданных не этим сервисом, email пользователя может быть неизвестен.

public/app.js

@@ -0,0 +1,304 @@
+const state = {
+  token: localStorage.getItem("fnsAdminToken") || "",
+  tokenExpiresAt: Number(localStorage.getItem("fnsAdminTokenExpiresAt") || 0),
+  receipts: [],
+  errors: [],
+  config: []
+};
+
+const $ = selector => document.querySelector(selector);
+const $$ = selector => [...document.querySelectorAll(selector)];
+
+function headers() {
+  const result = {
+    "Content-Type": "application/json"
+  };
+
+  if (state.token) {
+    result.Authorization = `Bearer ${state.token}`;
+  }
+
+  return result;
+}
+
+async function api(path, options = {}) {
+  const response = await fetch(path, {
+    ...options,
+    headers: {
+      ...headers(),
+      ...(options.headers || {})
+    }
+  });
+  const data = await response.json().catch(() => ({}));
+  if (!response.ok) {
+    throw new Error(data.error || data.technicalError?.message || `HTTP ${response.status}`);
+  }
+  return data;
+}
+
+function saveToken(auth) {
+  state.token = auth.token;
+  state.tokenExpiresAt = auth.expiresAt;
+  localStorage.setItem("fnsAdminToken", state.token);
+  localStorage.setItem("fnsAdminTokenExpiresAt", String(state.tokenExpiresAt));
+}
+
+function clearToken() {
+  state.token = "";
+  state.tokenExpiresAt = 0;
+  localStorage.removeItem("fnsAdminToken");
+  localStorage.removeItem("fnsAdminTokenExpiresAt");
+}
+
+function tokenLooksFresh() {
+  return Boolean(state.token && state.tokenExpiresAt * 1000 > Date.now() + 30000);
+}
+
+async function login(password) {
+  const auth = await api("/admin/api/login", {
+    method: "POST",
+    body: JSON.stringify({ password })
+  });
+  saveToken(auth);
+  return auth;
+}
+
+function toast(message) {
+  const el = $("#toast");
+  el.textContent = message;
+  el.classList.remove("hidden");
+  clearTimeout(toast.timer);
+  toast.timer = setTimeout(() => el.classList.add("hidden"), 4200);
+}
+
+function formatDate(value) {
+  if (!value) return "-";
+  const date = new Date(value);
+  if (Number.isNaN(date.getTime())) return value;
+  return date.toLocaleString("ru-RU");
+}
+
+function formatMoney(value) {
+  return (Number(value) || 0).toLocaleString("ru-RU", {
+    minimumFractionDigits: 2,
+    maximumFractionDigits: 2
+  });
+}
+
+function receiptText(receipt) {
+  const itemText = (receipt.items || [])
+    .map(item => `${item.id || ""} ${item.name || item.title || ""}`)
+    .join(" ");
+  return `${receipt.email || ""} ${receipt.receiptId || ""} ${itemText}`.toLowerCase();
+}
+
+function renderReceipts() {
+  const query = $("#receipt-search").value.trim().toLowerCase();
+  const filtered = state.receipts.filter(receipt => receiptText(receipt).includes(query));
+  const total = filtered.reduce((sum, receipt) => sum + (Number(receipt.amount) || Number(receipt.totalAmount) || 0), 0);
+
+  $("#metric-count").textContent = filtered.length;
+  $("#metric-total").textContent = formatMoney(total);
+  $("#metric-errors").textContent = state.errors.length;
+
+  $("#receipts-body").innerHTML = filtered.map(receipt => {
+    const amount = receipt.amount || receipt.totalAmount || 0;
+    const emailBadge = receipt.emailSent === true
+      ? '<span class="badge ok">отправлено</span>'
+      : receipt.emailSent === false
+        ? '<span class="badge bad">ошибка</span>'
+        : '<span class="badge warn">нет данных</span>';
+    const source = receipt.syncedFromFns ? "ФНС" : "локально";
+    const link = receipt.printLink
+      ? `<a href="${receipt.printLink}" target="_blank" rel="noreferrer">открыть</a>`
+      : "";
+
+    return `
+      <tr>
+        <td>${formatDate(receipt.createdAt || receipt.operationTime)}</td>
+        <td>${receipt.email || '<span class="muted">неизвестно</span>'}</td>
+        <td>
+          <div>${receipt.receiptId || '<span class="muted">нет ID</span>'}</div>
+          <div class="muted">${(receipt.items || []).map(item => item.name || item.title).filter(Boolean).join(", ")}</div>
+        </td>
+        <td>${formatMoney(amount)} ₽</td>
+        <td>${emailBadge}</td>
+        <td><span class="badge">${source}</span></td>
+        <td>${link}</td>
+      </tr>
+    `;
+  }).join("") || '<tr><td colspan="7" class="muted">Чеков пока нет</td></tr>';
+}
+
+function renderSettings() {
+  $("#settings-list").innerHTML = state.config.map(item => {
+    const type = item.secret ? "password" : item.key.includes("PORT") || item.key.includes("TIMEOUT") ? "number" : "text";
+    const placeholder = item.secret && item.configured ? "сохранено, введите новое значение для замены" : "";
+    return `
+      <div class="setting">
+        <label>
+          <span>${item.key}</span>
+          <span class="source">${item.source}${item.configured ? "" : " / пусто"}</span>
+        </label>
+        <input name="${item.key}" type="${type}" value="${item.value || ""}" placeholder="${placeholder}">
+      </div>
+    `;
+  }).join("");
+}
+
+async function loadReceipts() {
+  const data = await api("/admin/api/receipts");
+  state.receipts = data.receipts || [];
+  state.errors = data.errors || [];
+  renderReceipts();
+}
+
+async function loadConfig() {
+  const data = await api("/admin/api/config");
+  state.config = data.config || [];
+  renderSettings();
+}
+
+async function bootstrap() {
+  if (!tokenLooksFresh()) {
+    clearToken();
+    return;
+  }
+
+  await api("/admin/api/session", { method: "POST", body: "{}" });
+  $("#login-form").classList.add("hidden");
+  $("#session-actions").classList.remove("hidden");
+  await Promise.all([loadReceipts(), loadConfig()]);
+}
+
+function addItemRow(item = {}) {
+  const template = $("#item-row-template").content.cloneNode(true);
+  const row = template.querySelector(".item-row");
+  row.querySelector('[name="id"]').value = item.id || "";
+  row.querySelector('[name="name"]').value = item.name || "";
+  row.querySelector('[name="price"]').value = item.price || "";
+  row.querySelector('[name="quantity"]').value = item.quantity || 1;
+  row.querySelector(".remove-item").addEventListener("click", () => {
+    row.remove();
+    updateCreateTotal();
+  });
+  row.addEventListener("input", updateCreateTotal);
+  $("#items-list").append(row);
+  updateCreateTotal();
+}
+
+function currentItems() {
+  return $$("#items-list .item-row").map(row => ({
+    id: row.querySelector('[name="id"]').value.trim(),
+    name: row.querySelector('[name="name"]').value.trim(),
+    price: Number(row.querySelector('[name="price"]').value),
+    quantity: Number(row.querySelector('[name="quantity"]').value) || 1
+  })).filter(item => item.name && item.price > 0);
+}
+
+function updateCreateTotal() {
+  const total = currentItems().reduce((sum, item) => sum + item.price * item.quantity, 0);
+  $("#create-total").textContent = formatMoney(total);
+}
+
+function showView(name) {
+  $$(".tab").forEach(tab => tab.classList.toggle("active", tab.dataset.view === name));
+  $$(".view").forEach(view => view.classList.toggle("active", view.id === `view-${name}`));
+}
+
+function bindEvents() {
+  $$(".tab").forEach(tab => tab.addEventListener("click", () => showView(tab.dataset.view)));
+
+  $("#login-form").addEventListener("submit", async event => {
+    event.preventDefault();
+    try {
+      await login($("#admin-password").value);
+      $("#admin-password").value = "";
+      await bootstrap();
+      toast("Вход выполнен");
+    } catch (err) {
+      toast(err.message);
+    }
+  });
+
+  $("#logout-button").addEventListener("click", () => {
+    clearToken();
+    location.reload();
+  });
+
+  $("#receipt-search").addEventListener("input", renderReceipts);
+  $("#reload-receipts").addEventListener("click", () => loadReceipts().then(() => toast("Чеки обновлены")).catch(err => toast(err.message)));
+  $("#sync-fns").addEventListener("click", async () => {
+    try {
+      const result = await api("/admin/api/receipts/sync", { method: "POST", body: "{}" });
+      await loadReceipts();
+      toast(`Синхронизировано из ФНС: ${result.synced}`);
+    } catch (err) {
+      toast(err.message);
+    }
+  });
+
+  $("#add-item").addEventListener("click", () => addItemRow());
+  $("#create-form").addEventListener("submit", async event => {
+    event.preventDefault();
+    const email = new FormData(event.currentTarget).get("email");
+    const items = currentItems();
+    if (!items.length) {
+      toast("Добавьте хотя бы одну позицию с ценой");
+      return;
+    }
+    try {
+      const result = await api("/api/v1/create-receipt", {
+        method: "POST",
+        body: JSON.stringify({ email, items })
+      });
+      await loadReceipts();
+      toast(result.emailSent ? "Чек создан и отправлен" : "Чек создан, но письмо не ушло");
+    } catch (err) {
+      toast(err.message);
+    }
+  });
+
+  $("#settings-form").addEventListener("submit", async event => {
+    event.preventDefault();
+    const values = Object.fromEntries(new FormData(event.currentTarget).entries());
+    const nextPassword = values.API_PASS;
+    const rotatesJwtSecret = Boolean(values.JWT_SECRET);
+    try {
+      const data = await api("/admin/api/config", {
+        method: "PUT",
+        body: JSON.stringify({ values })
+      });
+      if (nextPassword) {
+        await login(nextPassword);
+      } else if (rotatesJwtSecret) {
+        clearToken();
+        $("#login-form").classList.remove("hidden");
+        $("#session-actions").classList.add("hidden");
+      }
+      state.config = data.config || [];
+      renderSettings();
+      toast(rotatesJwtSecret && !nextPassword ? "Настройки сохранены, войдите заново" : "Настройки сохранены");
+    } catch (err) {
+      toast(err.message);
+    }
+  });
+
+  $("#check-health").addEventListener("click", async () => {
+    $("#health-output").textContent = JSON.stringify(await fetch("/health/deep").then(r => r.json()), null, 2);
+  });
+  $("#check-smtp").addEventListener("click", async () => {
+    $("#health-output").textContent = JSON.stringify(await fetch("/health/smtp").then(r => r.json()), null, 2);
+  });
+  $("#check-fns-user").addEventListener("click", async () => {
+    try {
+      $("#health-output").textContent = JSON.stringify(await api("/admin/api/fns-user"), null, 2);
+    } catch (err) {
+      $("#health-output").textContent = err.message;
+    }
+  });
+}
+
+bindEvents();
+addItemRow();
+bootstrap().catch(err => toast(err.message));

public/index.html

@@ -0,0 +1,121 @@
+<!doctype html>
+<html lang="ru">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>FNS Receipt Service</title>
+  <link rel="stylesheet" href="/admin/styles.css">
+</head>
+<body>
+  <header class="topbar">
+    <div>
+      <h1>FNS Receipt Service</h1>
+      <p id="subtitle">Админ-панель чеков и настроек</p>
+    </div>
+    <form id="login-form" class="login">
+      <input id="admin-password" type="password" autocomplete="current-password" placeholder="API_PASS">
+      <button type="submit">Войти</button>
+    </form>
+    <div id="session-actions" class="session-actions hidden">
+      <span id="session-status">Подключено</span>
+      <button id="logout-button" type="button">Выйти</button>
+    </div>
+  </header>
+
+  <nav class="tabs" aria-label="Разделы">
+    <button class="tab active" type="button" data-view="receipts">Чеки</button>
+    <button class="tab" type="button" data-view="create">Создать чек</button>
+    <button class="tab" type="button" data-view="settings">Настройки</button>
+    <button class="tab" type="button" data-view="health">Диагностика</button>
+  </nav>
+
+  <main>
+    <section id="view-receipts" class="view active">
+      <div class="toolbar">
+        <div class="search">
+          <input id="receipt-search" type="search" placeholder="Поиск по email, ID чека или позиции">
+        </div>
+        <button id="reload-receipts" type="button">Обновить</button>
+        <button id="sync-fns" type="button">Синхронизировать с ФНС</button>
+      </div>
+
+      <div class="metrics">
+        <div><span id="metric-count">0</span><small>чеков</small></div>
+        <div><span id="metric-total">0.00</span><small>рублей</small></div>
+        <div><span id="metric-errors">0</span><small>ошибок</small></div>
+      </div>
+
+      <div class="table-wrap">
+        <table>
+          <thead>
+            <tr>
+              <th>Дата</th>
+              <th>Пользователь</th>
+              <th>Чек</th>
+              <th>Сумма</th>
+              <th>Письмо</th>
+              <th>Источник</th>
+              <th></th>
+            </tr>
+          </thead>
+          <tbody id="receipts-body"></tbody>
+        </table>
+      </div>
+    </section>
+
+    <section id="view-create" class="view">
+      <form id="create-form" class="panel form-grid">
+        <label>
+          Email пользователя
+          <input name="email" type="email" required placeholder="client@example.com">
+        </label>
+        <div class="items-head">
+          <strong>Позиции</strong>
+          <button id="add-item" type="button">Добавить позицию</button>
+        </div>
+        <div id="items-list" class="items-list"></div>
+        <div class="form-footer">
+          <span>Итого: <strong id="create-total">0.00</strong> ₽</span>
+          <button type="submit">Создать чек</button>
+        </div>
+      </form>
+    </section>
+
+    <section id="view-settings" class="view">
+      <form id="settings-form" class="panel">
+        <div class="settings-head">
+          <div>
+            <h2>Параметры сервиса</h2>
+            <p>Пустое секретное поле оставляет текущее значение без изменений.</p>
+          </div>
+          <button type="submit">Сохранить</button>
+        </div>
+        <div id="settings-list" class="settings-list"></div>
+      </form>
+    </section>
+
+    <section id="view-health" class="view">
+      <div class="toolbar">
+        <button id="check-health" type="button">Проверить сервис</button>
+        <button id="check-smtp" type="button">Проверить SMTP</button>
+        <button id="check-fns-user" type="button">Профиль ФНС</button>
+      </div>
+      <pre id="health-output" class="output">Нет данных</pre>
+    </section>
+  </main>
+
+  <div id="toast" class="toast hidden" role="status" aria-live="polite"></div>
+
+  <template id="item-row-template">
+    <div class="item-row">
+      <input name="id" placeholder="ID заказа">
+      <input name="name" placeholder="Название" required>
+      <input name="price" type="number" min="0" step="0.01" placeholder="Цена" required>
+      <input name="quantity" type="number" min="1" step="1" value="1" placeholder="Кол-во">
+      <button type="button" class="remove-item" aria-label="Удалить позицию">x</button>
+    </div>
+  </template>
+
+  <script src="/admin/app.js"></script>
+</body>
+</html>

public/openapi.json

@@ -0,0 +1,670 @@
+{
+  "openapi": "3.1.0",
+  "info": {
+    "title": "FNS Receipt Service API",
+    "version": "1.0.0",
+    "description": "API сервиса создания чеков ФНС, админ-панели, настроек и диагностики."
+  },
+  "servers": [
+    {
+      "url": "/",
+      "description": "Current host"
+    }
+  ],
+  "tags": [
+    {
+      "name": "Service",
+      "description": "Состояние сервиса"
+    },
+    {
+      "name": "Receipts",
+      "description": "Создание чеков"
+    },
+    {
+      "name": "Admin",
+      "description": "Админские методы UI"
+    }
+  ],
+  "components": {
+    "securitySchemes": {
+      "AdminBearer": {
+        "type": "http",
+        "scheme": "bearer",
+        "bearerFormat": "JWT",
+        "description": "JWT из POST /admin/api/login"
+      },
+      "AdminPassword": {
+        "type": "apiKey",
+        "in": "header",
+        "name": "x-admin-password",
+        "description": "Legacy: значение API_PASS"
+      }
+    },
+    "schemas": {
+      "Health": {
+        "type": "object",
+        "properties": {
+          "status": {
+            "type": "string",
+            "examples": [
+              "ok"
+            ]
+          }
+        }
+      },
+      "Item": {
+        "type": "object",
+        "required": [
+          "name",
+          "price"
+        ],
+        "properties": {
+          "id": {
+            "type": "string",
+            "examples": [
+              "order-1"
+            ]
+          },
+          "name": {
+            "type": "string",
+            "examples": [
+              "Услуга"
+            ]
+          },
+          "price": {
+            "type": "number",
+            "examples": [
+              1000
+            ]
+          },
+          "quantity": {
+            "type": "number",
+            "default": 1,
+            "examples": [
+              1
+            ]
+          }
+        }
+      },
+      "CreateReceiptRequest": {
+        "type": "object",
+        "required": [
+          "email",
+          "items"
+        ],
+        "properties": {
+          "api_pass": {
+            "type": "string",
+            "description": "Legacy-доступ для внешних интеграций. В UI вместо него используется Bearer JWT."
+          },
+          "email": {
+            "type": "string",
+            "format": "email",
+            "examples": [
+              "client@example.com"
+            ]
+          },
+          "items": {
+            "type": "array",
+            "minItems": 1,
+            "items": {
+              "$ref": "#/components/schemas/Item"
+            }
+          }
+        }
+      },
+      "CreateReceiptResponse": {
+        "type": "object",
+        "properties": {
+          "success": {
+            "type": "boolean"
+          },
+          "receiptCreated": {
+            "type": "boolean"
+          },
+          "emailSent": {
+            "type": "boolean"
+          },
+          "receiptId": {
+            "type": "string"
+          },
+          "printLink": {
+            "type": "string",
+            "format": "uri"
+          },
+          "warning": {
+            "type": "string"
+          },
+          "technicalError": {
+            "type": "object",
+            "additionalProperties": true
+          }
+        }
+      },
+      "Receipt": {
+        "type": "object",
+        "properties": {
+          "receiptId": {
+            "type": "string"
+          },
+          "email": {
+            "type": "string"
+          },
+          "amount": {
+            "type": "number"
+          },
+          "printLink": {
+            "type": "string"
+          },
+          "status": {
+            "type": "string"
+          },
+          "emailSent": {
+            "type": [
+              "boolean",
+              "null"
+            ]
+          },
+          "createdAt": {
+            "type": "string",
+            "format": "date-time"
+          },
+          "items": {
+            "type": "array",
+            "items": {
+              "$ref": "#/components/schemas/Item"
+            }
+          }
+        },
+        "additionalProperties": true
+      },
+      "ConfigItem": {
+        "type": "object",
+        "properties": {
+          "key": {
+            "type": "string"
+          },
+          "value": {
+            "type": "string"
+          },
+          "configured": {
+            "type": "boolean"
+          },
+          "secret": {
+            "type": "boolean"
+          },
+          "source": {
+            "type": "string",
+            "enum": [
+              "env",
+              "ui"
+            ]
+          }
+        }
+      },
+      "ErrorResponse": {
+        "type": "object",
+        "properties": {
+          "error": {
+            "type": "string"
+          },
+          "technicalError": {
+            "type": "object",
+            "additionalProperties": true
+          }
+        }
+      },
+      "LoginRequest": {
+        "type": "object",
+        "required": [
+          "password"
+        ],
+        "properties": {
+          "password": {
+            "type": "string",
+            "description": "Значение API_PASS"
+          }
+        }
+      },
+      "LoginResponse": {
+        "type": "object",
+        "properties": {
+          "success": {
+            "type": "boolean"
+          },
+          "token": {
+            "type": "string"
+          },
+          "expiresAt": {
+            "type": "number"
+          },
+          "expiresIn": {
+            "type": "number"
+          }
+        }
+      }
+    }
+  },
+  "paths": {
+    "/": {
+      "get": {
+        "tags": [
+          "Service"
+        ],
+        "summary": "Информация о сервисе",
+        "responses": {
+          "200": {
+            "description": "Сервис доступен",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "service": {
+                      "type": "string"
+                    },
+                    "status": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    "/health": {
+      "get": {
+        "tags": [
+          "Service"
+        ],
+        "summary": "Быстрая проверка состояния",
+        "responses": {
+          "200": {
+            "description": "OK",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/Health"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    "/health/deep": {
+      "get": {
+        "tags": [
+          "Service"
+        ],
+        "summary": "Проверка SMTP и ФНС",
+        "responses": {
+          "200": {
+            "description": "Результат диагностики",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "status": {
+                      "type": "string"
+                    },
+                    "connect_to_fns": {
+                      "type": "string"
+                    },
+                    "smtp": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    "/health/smtp": {
+      "get": {
+        "tags": [
+          "Service"
+        ],
+        "summary": "Проверка SMTP",
+        "responses": {
+          "200": {
+            "description": "SMTP доступен"
+          },
+          "500": {
+            "description": "Ошибка SMTP",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    "/api/v1/create-receipt": {
+      "post": {
+        "tags": [
+          "Receipts"
+        ],
+        "summary": "Создать чек в ФНС и отправить email",
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/components/schemas/CreateReceiptRequest"
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "Чек создан",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/CreateReceiptResponse"
+                }
+              }
+            }
+          },
+          "400": {
+            "description": "Неверные данные"
+          },
+          "401": {
+            "description": "Неверный api_pass"
+          },
+          "500": {
+            "description": "Ошибка создания чека",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ErrorResponse"
+                }
+              }
+            }
+          }
+        },
+        "security": [
+          {
+            "AdminBearer": []
+          },
+          {}
+        ]
+      }
+    },
+    "/admin/api/session": {
+      "post": {
+        "tags": [
+          "Admin"
+        ],
+        "summary": "Проверить пароль админ-панели",
+        "security": [
+          {
+            "AdminBearer": []
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Пароль принят"
+          },
+          "401": {
+            "description": "Неверный пароль"
+          }
+        }
+      }
+    },
+    "/admin/api/config": {
+      "get": {
+        "tags": [
+          "Admin"
+        ],
+        "summary": "Получить настройки сервиса",
+        "security": [
+          {
+            "AdminBearer": []
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Настройки",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "config": {
+                      "type": "array",
+                      "items": {
+                        "$ref": "#/components/schemas/ConfigItem"
+                      }
+                    },
+                    "files": {
+                      "type": "object",
+                      "additionalProperties": {
+                        "type": "string"
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      },
+      "put": {
+        "tags": [
+          "Admin"
+        ],
+        "summary": "Обновить настройки сервиса",
+        "security": [
+          {
+            "AdminBearer": []
+          }
+        ],
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": {
+                "type": "object",
+                "properties": {
+                  "values": {
+                    "type": "object",
+                    "additionalProperties": {
+                      "type": "string"
+                    }
+                  }
+                }
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "Настройки сохранены"
+          }
+        }
+      }
+    },
+    "/admin/api/receipts": {
+      "get": {
+        "tags": [
+          "Admin"
+        ],
+        "summary": "Получить локальный журнал чеков и ошибок",
+        "security": [
+          {
+            "AdminBearer": []
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Чеки и ошибки",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "receipts": {
+                      "type": "array",
+                      "items": {
+                        "$ref": "#/components/schemas/Receipt"
+                      }
+                    },
+                    "errors": {
+                      "type": "array",
+                      "items": {
+                        "type": "object",
+                        "additionalProperties": true
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+    "/admin/api/receipts/sync": {
+      "post": {
+        "tags": [
+          "Admin"
+        ],
+        "summary": "Синхронизировать последние чеки из ФНС",
+        "security": [
+          {
+            "AdminBearer": []
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Синхронизация выполнена",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "success": {
+                      "type": "boolean"
+                    },
+                    "synced": {
+                      "type": "number"
+                    },
+                    "total": {
+                      "type": "number"
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "500": {
+            "description": "Ошибка синхронизации"
+          }
+        }
+      }
+    },
+    "/admin/api/fns-user": {
+      "get": {
+        "tags": [
+          "Admin"
+        ],
+        "summary": "Получить профиль ФНС",
+        "security": [
+          {
+            "AdminBearer": []
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Профиль ФНС",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "object",
+                  "properties": {
+                    "user": {
+                      "type": "object",
+                      "additionalProperties": true
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "500": {
+            "description": "Ошибка ФНС"
+          }
+        }
+      }
+    },
+    "/openapi.json": {
+      "get": {
+        "tags": [
+          "Service"
+        ],
+        "summary": "OpenAPI JSON",
+        "responses": {
+          "200": {
+            "description": "Спецификация OpenAPI"
+          }
+        }
+      }
+    },
+    "/swagger": {
+      "get": {
+        "tags": [
+          "Service"
+        ],
+        "summary": "Swagger UI",
+        "responses": {
+          "200": {
+            "description": "Swagger UI HTML"
+          }
+        }
+      }
+    },
+    "/admin/api/login": {
+      "post": {
+        "tags": [
+          "Admin"
+        ],
+        "summary": "Войти в админ-панель и получить JWT",
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/components/schemas/LoginRequest"
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "JWT создан",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/LoginResponse"
+                }
+              }
+            }
+          },
+          "401": {
+            "description": "Неверный пароль"
+          }
+        }
+      }
+    }
+  }
+}

public/styles.css

@@ -0,0 +1,355 @@
+:root {
+  color-scheme: light;
+  --bg: #f4f7f6;
+  --surface: #ffffff;
+  --surface-2: #eef3f1;
+  --text: #16211e;
+  --muted: #63716d;
+  --line: #d9e1de;
+  --accent: #0f766e;
+  --accent-2: #c2410c;
+  --ok: #15803d;
+  --warn: #b45309;
+  --bad: #b91c1c;
+  --shadow: 0 12px 30px rgba(28, 45, 40, 0.08);
+}
+
+* {
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+  background: var(--bg);
+  color: var(--text);
+  font: 14px/1.45 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+}
+
+button,
+input,
+select {
+  font: inherit;
+}
+
+button {
+  min-height: 38px;
+  border: 1px solid var(--line);
+  border-radius: 6px;
+  background: var(--surface);
+  color: var(--text);
+  cursor: pointer;
+  padding: 0 14px;
+}
+
+button:hover {
+  border-color: var(--accent);
+}
+
+button[type="submit"],
+#sync-fns {
+  background: var(--accent);
+  border-color: var(--accent);
+  color: #ffffff;
+}
+
+input,
+select {
+  width: 100%;
+  min-height: 38px;
+  border: 1px solid var(--line);
+  border-radius: 6px;
+  background: #ffffff;
+  color: var(--text);
+  padding: 8px 10px;
+}
+
+input:focus {
+  outline: 2px solid rgba(15, 118, 110, 0.2);
+  border-color: var(--accent);
+}
+
+.topbar {
+  display: grid;
+  grid-template-columns: 1fr minmax(280px, 420px);
+  gap: 18px;
+  align-items: center;
+  padding: 22px 28px;
+  background: var(--surface);
+  border-bottom: 1px solid var(--line);
+}
+
+h1,
+h2,
+p {
+  margin: 0;
+}
+
+h1 {
+  font-size: 24px;
+}
+
+h2 {
+  font-size: 18px;
+}
+
+#subtitle,
+.settings-head p {
+  color: var(--muted);
+  margin-top: 4px;
+}
+
+.login,
+.session-actions,
+.toolbar,
+.form-footer,
+.settings-head {
+  display: flex;
+  gap: 10px;
+  align-items: center;
+}
+
+.session-actions {
+  justify-content: flex-end;
+}
+
+.tabs {
+  display: flex;
+  gap: 4px;
+  padding: 10px 28px 0;
+}
+
+.tab {
+  border-bottom-left-radius: 0;
+  border-bottom-right-radius: 0;
+  background: transparent;
+}
+
+.tab.active {
+  background: var(--surface);
+  border-bottom-color: var(--surface);
+  color: var(--accent);
+}
+
+main {
+  padding: 22px 28px 34px;
+}
+
+.view {
+  display: none;
+}
+
+.view.active {
+  display: block;
+}
+
+.toolbar {
+  justify-content: flex-end;
+  margin-bottom: 14px;
+}
+
+.search {
+  flex: 1;
+  min-width: 220px;
+}
+
+.metrics {
+  display: grid;
+  grid-template-columns: repeat(3, minmax(120px, 1fr));
+  gap: 12px;
+  margin-bottom: 14px;
+}
+
+.metrics div,
+.panel,
+.table-wrap,
+.output {
+  background: var(--surface);
+  border: 1px solid var(--line);
+  border-radius: 8px;
+  box-shadow: var(--shadow);
+}
+
+.metrics div {
+  padding: 16px;
+}
+
+.metrics span {
+  display: block;
+  font-size: 24px;
+  font-weight: 700;
+}
+
+.metrics small {
+  color: var(--muted);
+}
+
+.table-wrap {
+  overflow: auto;
+}
+
+table {
+  width: 100%;
+  min-width: 860px;
+  border-collapse: collapse;
+}
+
+th,
+td {
+  padding: 11px 12px;
+  border-bottom: 1px solid var(--line);
+  text-align: left;
+  vertical-align: top;
+}
+
+th {
+  color: var(--muted);
+  font-size: 12px;
+  font-weight: 700;
+  text-transform: uppercase;
+}
+
+td a {
+  color: var(--accent);
+  text-decoration: none;
+}
+
+.muted {
+  color: var(--muted);
+}
+
+.badge {
+  display: inline-flex;
+  align-items: center;
+  min-height: 24px;
+  border-radius: 999px;
+  padding: 2px 9px;
+  background: var(--surface-2);
+  color: var(--muted);
+  white-space: nowrap;
+}
+
+.badge.ok {
+  background: #dcfce7;
+  color: var(--ok);
+}
+
+.badge.warn {
+  background: #ffedd5;
+  color: var(--warn);
+}
+
+.badge.bad {
+  background: #fee2e2;
+  color: var(--bad);
+}
+
+.panel {
+  padding: 18px;
+}
+
+.form-grid {
+  display: grid;
+  gap: 16px;
+}
+
+.items-head {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.items-list {
+  display: grid;
+  gap: 8px;
+}
+
+.item-row {
+  display: grid;
+  grid-template-columns: minmax(90px, 0.7fr) minmax(180px, 2fr) minmax(90px, 0.8fr) minmax(80px, 0.6fr) 38px;
+  gap: 8px;
+  align-items: center;
+}
+
+.remove-item {
+  padding: 0;
+}
+
+.form-footer {
+  justify-content: space-between;
+}
+
+.settings-head {
+  justify-content: space-between;
+  margin-bottom: 16px;
+}
+
+.settings-list {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(240px, 1fr));
+  gap: 14px;
+}
+
+.setting label {
+  display: flex;
+  justify-content: space-between;
+  gap: 8px;
+  color: var(--muted);
+  margin-bottom: 5px;
+}
+
+.source {
+  font-size: 12px;
+}
+
+.output {
+  min-height: 320px;
+  overflow: auto;
+  padding: 16px;
+  white-space: pre-wrap;
+}
+
+.toast {
+  position: fixed;
+  right: 22px;
+  bottom: 22px;
+  max-width: min(420px, calc(100vw - 44px));
+  padding: 12px 14px;
+  background: var(--text);
+  color: #ffffff;
+  border-radius: 8px;
+  box-shadow: var(--shadow);
+}
+
+.hidden {
+  display: none;
+}
+
+@media (max-width: 760px) {
+  .topbar {
+    grid-template-columns: 1fr;
+    padding: 18px;
+  }
+
+  .tabs {
+    padding-inline: 18px;
+    overflow-x: auto;
+  }
+
+  main {
+    padding: 18px;
+  }
+
+  .toolbar,
+  .login,
+  .form-footer,
+  .settings-head {
+    align-items: stretch;
+    flex-direction: column;
+  }
+
+  .metrics,
+  .settings-list,
+  .item-row {
+    grid-template-columns: 1fr;
+  }
+}

public/swagger.html

@@ -0,0 +1,30 @@
+<!doctype html>
+<html lang="ru">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>FNS Receipt Service API</title>
+  <link rel="stylesheet" href="https://unpkg.com/swagger-ui-dist@5/swagger-ui.css">
+  <style>
+    body {
+      margin: 0;
+      background: #ffffff;
+    }
+  </style>
+</head>
+<body>
+  <div id="swagger-ui"></div>
+  <script src="https://unpkg.com/swagger-ui-dist@5/swagger-ui-bundle.js"></script>
+  <script>
+    window.onload = () => {
+      window.ui = SwaggerUIBundle({
+        url: "/openapi.json",
+        dom_id: "#swagger-ui",
+        deepLinking: true,
+        persistAuthorization: true,
+        displayRequestDuration: true
+      });
+    };
+  </script>
+</body>
+</html>

server.js

@@ -5,6 +5,7 @@ import dotenv from "dotenv";
 import pkg from "lknpd-nalog-api";
 import fs from "fs/promises";
 import path from "path";
+import crypto from "crypto";
 import { fileURLToPath } from "url";
 
 dotenv.config();
@@ -17,42 +18,119 @@ const __dirname = path.dirname(__filename);
 const app = express();
 app.use(express.json({ limit: "1mb" }));
 
-const PORT = process.env.PORT || 4000;
-const HOST = process.env.HOST || "0.0.0.0";
 const MAX_RETRIES = 3;
-const FNS_TIMEOUT_MS = Number(process.env.FNS_TIMEOUT_MS || 30000);
-const SMTP_TIMEOUT_MS = Number(process.env.SMTP_TIMEOUT_MS || 15000);
+const DATA_DIR = path.join(__dirname, "data");
 const ERROR_FILE = path.join(__dirname, "error.json");
-const ADMIN_EMAIL = process.env.ADMIN_EMAIL;
-const SMTP_PORT = Number(process.env.SMTP_PORT || 587);
-const SMTP_SECURE = process.env.SMTP_SECURE
-  ? process.env.SMTP_SECURE === "true"
-  : SMTP_PORT === 465;
-
-const transporter = nodemailer.createTransport({
-  host: process.env.SMTP_HOST,
-  port: SMTP_PORT,
-  secure: SMTP_SECURE,
-  auth: {
-    user: process.env.SMTP_USER,
-    pass: process.env.SMTP_PASS
-  },
-  connectionTimeout: SMTP_TIMEOUT_MS,
-  greetingTimeout: SMTP_TIMEOUT_MS,
-  socketTimeout: SMTP_TIMEOUT_MS
-});
+const RECEIPTS_FILE = path.join(DATA_DIR, "receipts.json");
+const CONFIG_FILE = path.join(DATA_DIR, "config.json");
+const PUBLIC_DIR = path.join(__dirname, "public");
+const CONFIG_KEYS = [
+  "INN",
+  "PASSWORD",
+  "APPNAME",
+  "ADMIN_EMAIL",
+  "SMTP_HOST",
+  "SMTP_PORT",
+  "SMTP_SECURE",
+  "SMTP_USER",
+  "SMTP_PASS",
+  "SMTP_MAIL_FROM",
+  "API_PASS",
+  "JWT_SECRET",
+  "ADMIN_SESSION_HOURS",
+  "PORT",
+  "HOST",
+  "FNS_TIMEOUT_MS",
+  "SMTP_TIMEOUT_MS"
+];
+const SECRET_KEYS = new Set(["PASSWORD", "SMTP_PASS", "API_PASS", "JWT_SECRET"]);
 
 let nalogApi;
+let runtimeConfig = {};
+let transporter;
+
+function getConfig(key, fallback = "") {
+  return runtimeConfig[key] ?? process.env[key] ?? fallback;
+}
+
+function getNumberConfig(key, fallback) {
+  return Number(getConfig(key, fallback)) || fallback;
+}
+
+function getBooleanConfig(key, fallback = false) {
+  const value = getConfig(key, fallback ? "true" : "false");
+  return value === true || value === "true";
+}
+
+function getSmtpPort() {
+  return getNumberConfig("SMTP_PORT", 587);
+}
+
+function getSmtpSecure() {
+  const value = getConfig("SMTP_SECURE", "");
+  return value === "" ? getSmtpPort() === 465 : getBooleanConfig("SMTP_SECURE");
+}
+
+function getFnsTimeoutMs() {
+  return getNumberConfig("FNS_TIMEOUT_MS", 30000);
+}
+
+function getSmtpTimeoutMs() {
+  return getNumberConfig("SMTP_TIMEOUT_MS", 15000);
+}
+
+function getAdminSessionSeconds() {
+  return Math.max(1, getNumberConfig("ADMIN_SESSION_HOURS", 12)) * 60 * 60;
+}
+
+function createTransporter() {
+  const smtpTimeoutMs = getSmtpTimeoutMs();
+
+  return nodemailer.createTransport({
+    host: getConfig("SMTP_HOST"),
+    port: getSmtpPort(),
+    secure: getSmtpSecure(),
+    auth: {
+      user: getConfig("SMTP_USER"),
+      pass: getConfig("SMTP_PASS")
+    },
+    connectionTimeout: smtpTimeoutMs,
+    greetingTimeout: smtpTimeoutMs,
+    socketTimeout: smtpTimeoutMs
+  });
+}
+
+async function readJsonFile(filePath, fallback) {
+  try {
+    const data = await fs.readFile(filePath, "utf8");
+    return JSON.parse(data);
+  } catch (err) {
+    return fallback;
+  }
+}
+
+async function writeJsonFile(filePath, value) {
+  await fs.mkdir(path.dirname(filePath), { recursive: true });
+  await fs.writeFile(filePath, JSON.stringify(value, null, 2));
+}
+
+async function loadRuntimeConfig() {
+  const savedConfig = await readJsonFile(CONFIG_FILE, {});
+  runtimeConfig = savedConfig && typeof savedConfig === "object" && !Array.isArray(savedConfig)
+    ? savedConfig
+    : {};
+  transporter = createTransporter();
+}
 
 function getNalogApi() {
-  if (!process.env.INN || !process.env.PASSWORD) {
+  if (!getConfig("INN") || !getConfig("PASSWORD")) {
     throw new Error("INN and PASSWORD environment variables are required");
   }
 
   if (!nalogApi) {
     nalogApi = new NalogApi({
-      inn: process.env.INN,
-      password: process.env.PASSWORD
+      inn: getConfig("INN"),
+      password: getConfig("PASSWORD")
     });
   }
 
@@ -91,13 +169,113 @@ function formatTechnicalError(err) {
   };
 }
 
+function base64UrlEncode(value) {
+  return Buffer.from(value)
+    .toString("base64")
+    .replace(/=/g, "")
+    .replace(/\+/g, "-")
+    .replace(/\//g, "_");
+}
+
+function base64UrlDecode(value) {
+  const normalized = value.replace(/-/g, "+").replace(/_/g, "/");
+  const padded = normalized.padEnd(normalized.length + ((4 - normalized.length % 4) % 4), "=");
+  return Buffer.from(padded, "base64").toString("utf8");
+}
+
+function safeEqual(a, b) {
+  const first = Buffer.from(String(a));
+  const second = Buffer.from(String(b));
+  return first.length === second.length && crypto.timingSafeEqual(first, second);
+}
+
+function getJwtSecret() {
+  return getConfig("JWT_SECRET") || getConfig("API_PASS");
+}
+
+function signJwt(payload) {
+  const secret = getJwtSecret();
+  if (!secret) {
+    throw new Error("JWT_SECRET or API_PASS is required");
+  }
+
+  const encodedHeader = base64UrlEncode(JSON.stringify({ alg: "HS256", typ: "JWT" }));
+  const encodedPayload = base64UrlEncode(JSON.stringify(payload));
+  const signature = crypto
+    .createHmac("sha256", secret)
+    .update(`${encodedHeader}.${encodedPayload}`)
+    .digest("base64")
+    .replace(/=/g, "")
+    .replace(/\+/g, "-")
+    .replace(/\//g, "_");
+
+  return `${encodedHeader}.${encodedPayload}.${signature}`;
+}
+
+function verifyJwt(token) {
+  if (!token || typeof token !== "string") return null;
+
+  const [encodedHeader, encodedPayload, signature] = token.split(".");
+  if (!encodedHeader || !encodedPayload || !signature) return null;
+
+  const secret = getJwtSecret();
+  if (!secret) return null;
+
+  const expectedSignature = crypto
+    .createHmac("sha256", secret)
+    .update(`${encodedHeader}.${encodedPayload}`)
+    .digest("base64")
+    .replace(/=/g, "")
+    .replace(/\+/g, "-")
+    .replace(/\//g, "_");
+
+  if (!safeEqual(signature, expectedSignature)) return null;
+
+  try {
+    const payload = JSON.parse(base64UrlDecode(encodedPayload));
+    if (!payload.exp || payload.exp < Math.floor(Date.now() / 1000)) return null;
+    if (payload.sub !== "admin") return null;
+    return payload;
+  } catch (err) {
+    return null;
+  }
+}
+
+function createAdminToken() {
+  const now = Math.floor(Date.now() / 1000);
+  const expiresIn = getAdminSessionSeconds();
+  const expiresAt = now + expiresIn;
+
+  return {
+    token: signJwt({
+      sub: "admin",
+      role: "admin",
+      iat: now,
+      exp: expiresAt
+    }),
+    expiresAt,
+    expiresIn
+  };
+}
+
+function getBearerToken(req) {
+  const authorization = req.get("authorization") || "";
+  const [scheme, token] = authorization.split(" ");
+  return scheme?.toLowerCase() === "bearer" ? token : "";
+}
+
+function verifyAdminPassword(password) {
+  const expectedPassword = getConfig("API_PASS");
+  return Boolean(expectedPassword && password && safeEqual(password, expectedPassword));
+}
+
 function smtpConfigForResponse() {
   return {
-    host: process.env.SMTP_HOST,
-    port: SMTP_PORT,
-    secure: SMTP_SECURE,
-    user: process.env.SMTP_USER,
-    from: process.env.SMTP_MAIL_FROM
+    host: getConfig("SMTP_HOST"),
+    port: getSmtpPort(),
+    secure: getSmtpSecure(),
+    user: getConfig("SMTP_USER"),
+    from: getConfig("SMTP_MAIL_FROM")
   };
 }
 
@@ -123,7 +301,7 @@ async function createReceiptWithRetry(income, retries = MAX_RETRIES) {
     try {
       return await withTimeout(
         getNalogApi().addIncome(income),
-        FNS_TIMEOUT_MS,
+        getFnsTimeoutMs(),
         "FNS receipt creation"
       );
     } catch (err) {
@@ -160,6 +338,135 @@ async function saveToErrorFile(errorData) {
   }
 }
 
+async function saveReceipt(receiptData) {
+  const receipts = await readJsonFile(RECEIPTS_FILE, []);
+  const nextReceipts = Array.isArray(receipts) ? receipts : [];
+  const existingIndex = nextReceipts.findIndex(item => item.receiptId === receiptData.receiptId);
+  const normalizedReceipt = {
+    ...receiptData,
+    createdAt: receiptData.createdAt || new Date().toISOString(),
+    updatedAt: new Date().toISOString()
+  };
+
+  if (existingIndex >= 0) {
+    nextReceipts[existingIndex] = {
+      ...nextReceipts[existingIndex],
+      ...normalizedReceipt
+    };
+  } else {
+    nextReceipts.unshift(normalizedReceipt);
+  }
+
+  await writeJsonFile(RECEIPTS_FILE, nextReceipts);
+}
+
+function requireAdmin(req, res, next) {
+  if (!getConfig("API_PASS")) {
+    return res.status(500).json({ error: "API_PASS is not configured" });
+  }
+
+  const tokenPayload = verifyJwt(getBearerToken(req));
+  if (tokenPayload) {
+    req.admin = tokenPayload;
+    return next();
+  }
+
+  if (!verifyAdminPassword(req.get("x-admin-password") || req.body?.api_pass)) {
+    return res.status(401).json({ error: "Unauthorized" });
+  }
+
+  next();
+}
+
+function hasReceiptAccess(req) {
+  return verifyJwt(getBearerToken(req)) || verifyAdminPassword(req.body?.api_pass);
+}
+
+function publicConfig() {
+  return CONFIG_KEYS.map(key => ({
+    key,
+    value: SECRET_KEYS.has(key) ? "" : String(getConfig(key, "")),
+    configured: Boolean(getConfig(key, "")),
+    secret: SECRET_KEYS.has(key),
+    source: Object.prototype.hasOwnProperty.call(runtimeConfig, key) ? "ui" : "env"
+  }));
+}
+
+function receiptPrintLink(receiptId) {
+  return `https://lknpd.nalog.ru/api/v1/receipt/${getConfig("INN")}/${receiptId}/print`;
+}
+
+function normalizeFnsIncome(item) {
+  const receiptId = item.receiptUuid || item.uuid || item.approvedReceiptUuid || item.receiptId || item.id;
+  const amount = Number(item.totalAmount || item.amount || item.incomeInfo?.totalAmount || 0);
+  return {
+    source: "fns",
+    receiptId,
+    email: "",
+    amount,
+    status: item.cancelTime || item.cancellationInfo ? "cancelled" : "created",
+    emailSent: null,
+    createdAt: item.operationTime || item.requestTime || item.createdAt || null,
+    printLink: receiptId ? receiptPrintLink(receiptId) : "",
+    items: item.services || [],
+    raw: item
+  };
+}
+
+async function getFnsReceipts({ offset = 0, limit = 50 } = {}) {
+  const params = new URLSearchParams({
+    offset: String(offset),
+    limit: String(Math.min(Number(limit) || 50, 50)),
+    sortBy: "operation_time:desc"
+  });
+  const data = await withTimeout(
+    getNalogApi().callMethod(`incomes?${params.toString()}`),
+    getFnsTimeoutMs(),
+    "FNS income list"
+  );
+  const items = data.items || data.content || data.incomes || [];
+
+  return {
+    items: Array.isArray(items) ? items.map(normalizeFnsIncome) : [],
+    total: data.total || data.totalCount || items.length || 0,
+    hasMore: Boolean(data.hasMore || data.has_more)
+  };
+}
+
+async function syncFnsReceipts() {
+  const fnsReceipts = await getFnsReceipts();
+  const localReceipts = await readJsonFile(RECEIPTS_FILE, []);
+  const merged = Array.isArray(localReceipts) ? [...localReceipts] : [];
+
+  for (const fnsReceipt of fnsReceipts.items) {
+    if (!fnsReceipt.receiptId) continue;
+    const existingIndex = merged.findIndex(item => item.receiptId === fnsReceipt.receiptId);
+    if (existingIndex >= 0) {
+      merged[existingIndex] = {
+        ...fnsReceipt,
+        ...merged[existingIndex],
+        fns: fnsReceipt.raw,
+        updatedAt: new Date().toISOString()
+      };
+    } else {
+      merged.push({
+        ...fnsReceipt,
+        status: fnsReceipt.status || "created",
+        syncedFromFns: true,
+        updatedAt: new Date().toISOString()
+      });
+    }
+  }
+
+  merged.sort((a, b) => new Date(b.createdAt || 0) - new Date(a.createdAt || 0));
+  await writeJsonFile(RECEIPTS_FILE, merged);
+
+  return {
+    synced: fnsReceipts.items.length,
+    total: merged.length
+  };
+}
+
 async function notifyAdmin(errorData) {
   try {
     const html = `
@@ -185,21 +492,31 @@ async function notifyAdmin(errorData) {
 
     await withTimeout(
       transporter.sendMail({
-        from: process.env.SMTP_MAIL_FROM,
-        to: ADMIN_EMAIL,
-        subject: `Ошибка создания чека ${process.env.APPNAME}`,
+        from: getConfig("SMTP_MAIL_FROM"),
+        to: getConfig("ADMIN_EMAIL"),
+        subject: `Ошибка создания чека ${getConfig("APPNAME")}`,
         html
       }),
-      SMTP_TIMEOUT_MS,
+      getSmtpTimeoutMs(),
       "Admin email sending"
     );
     
-    console.log(`Администратор ${ADMIN_EMAIL} уведомлен об ошибке`);
+    console.log(`Администратор ${getConfig("ADMIN_EMAIL")} уведомлен об ошибке`);
   } catch (err) {
     console.error("Не удалось отправить уведомление администратору:", err);
   }
 }
 
+app.use("/admin", express.static(PUBLIC_DIR));
+
+app.get("/openapi.json", (req, res) => {
+  res.sendFile(path.join(PUBLIC_DIR, "openapi.json"));
+});
+
+app.get("/swagger", (req, res) => {
+  res.sendFile(path.join(PUBLIC_DIR, "swagger.html"));
+});
+
 app.get("/", (req, res) => {
   res.json({
     service: "fns-receipt-service",
@@ -249,7 +566,7 @@ app.get("/health/smtp", async (req, res) => {
   const smtp = smtpConfigForResponse();
 
   try {
-    await checkTcpConnection(process.env.SMTP_HOST, SMTP_PORT, SMTP_TIMEOUT_MS);
+    await checkTcpConnection(getConfig("SMTP_HOST"), getSmtpPort(), getSmtpTimeoutMs());
   } catch (err) {
     return res.status(500).json({
       status: "error",
@@ -261,7 +578,7 @@ app.get("/health/smtp", async (req, res) => {
   }
 
   try {
-    await withTimeout(transporter.verify(), SMTP_TIMEOUT_MS, "SMTP health check");
+    await withTimeout(transporter.verify(), getSmtpTimeoutMs(), "SMTP health check");
     res.json({ status: "ok", smtp: "ok", config: smtp });
   } catch (err) {
     res.status(500).json({
@@ -274,11 +591,101 @@ app.get("/health/smtp", async (req, res) => {
   }
 });
 
+app.post("/admin/api/login", (req, res) => {
+  if (!getConfig("API_PASS")) {
+    return res.status(500).json({ error: "API_PASS is not configured" });
+  }
+
+  if (!verifyAdminPassword(req.body?.password)) {
+    return res.status(401).json({ error: "Unauthorized" });
+  }
+
+  res.json({
+    success: true,
+    ...createAdminToken()
+  });
+});
+
+app.post("/admin/api/session", requireAdmin, (req, res) => {
+  res.json({
+    success: true,
+    admin: req.admin || null
+  });
+});
+
+app.get("/admin/api/config", requireAdmin, (req, res) => {
+  res.json({
+    config: publicConfig(),
+    files: {
+      config: CONFIG_FILE,
+      receipts: RECEIPTS_FILE,
+      errors: ERROR_FILE
+    }
+  });
+});
+
+app.put("/admin/api/config", requireAdmin, async (req, res) => {
+  const values = req.body?.values || {};
+  const nextConfig = { ...runtimeConfig };
+
+  for (const key of CONFIG_KEYS) {
+    if (!Object.prototype.hasOwnProperty.call(values, key)) continue;
+    const value = typeof values[key] === "string" ? values[key].trim() : values[key];
+    if (SECRET_KEYS.has(key) && value === "") continue;
+    if (value === "" || value === null || value === undefined) {
+      delete nextConfig[key];
+    } else {
+      nextConfig[key] = String(value);
+    }
+  }
+
+  runtimeConfig = nextConfig;
+  nalogApi = undefined;
+  transporter = createTransporter();
+  await writeJsonFile(CONFIG_FILE, runtimeConfig);
+
+  res.json({ success: true, config: publicConfig() });
+});
+
+app.get("/admin/api/receipts", requireAdmin, async (req, res) => {
+  const receipts = await readJsonFile(RECEIPTS_FILE, []);
+  const errors = await readJsonFile(ERROR_FILE, []);
+
+  res.json({
+    receipts: Array.isArray(receipts) ? receipts : [],
+    errors: Array.isArray(errors) ? errors : []
+  });
+});
+
+app.post("/admin/api/receipts/sync", requireAdmin, async (req, res) => {
+  try {
+    const result = await syncFnsReceipts();
+    res.json({ success: true, ...result });
+  } catch (err) {
+    res.status(500).json({
+      error: "Не удалось синхронизировать чеки из ФНС",
+      technicalError: formatTechnicalError(err)
+    });
+  }
+});
+
+app.get("/admin/api/fns-user", requireAdmin, async (req, res) => {
+  try {
+    const user = await withTimeout(getNalogApi().getUserInfo(), getFnsTimeoutMs(), "FNS user info");
+    res.json({ user });
+  } catch (err) {
+    res.status(500).json({
+      error: "Не удалось получить профиль ФНС",
+      technicalError: formatTechnicalError(err)
+    });
+  }
+});
+
 app.post("/api/v1/create-receipt", async (req, res) => {
   try {
-    const { api_pass, email, items } = req.body;
+    const { email, items } = req.body;
 
-    if (api_pass !== process.env.API_PASS) {
+    if (!hasReceiptAccess(req)) {
       return res.status(401).json({ error: "Unauthorized" });
     }
 
@@ -289,14 +696,14 @@ app.post("/api/v1/create-receipt", async (req, res) => {
     const total = calculateTotal(items);
 
     const income = {
-      name: `${process.env.APPNAME}`,
+      name: `${getConfig("APPNAME")}`,
       amount: Number(total.toFixed(2)),
       quantity: 1
     };
 
     const receiptId = await createReceiptWithRetry(income);
 
-    const printLink = `https://lknpd.nalog.ru/api/v1/receipt/${process.env.INN}/${receiptId}/print`;
+    const printLink = receiptPrintLink(receiptId);
 
     const rows = items.map(i => {
       const price = Number(i.price) || 0;
@@ -346,7 +753,7 @@ style="display:inline-block;background:#ffdd2d;padding:16px 36px;border-radius:4
 </a>
 
 <p style="font-size:12px;color:#999;margin-top:24px;">
-${process.env.APPNAME}
+${getConfig("APPNAME")}
 </p>
 </td>
 </tr>
@@ -361,12 +768,12 @@ ${process.env.APPNAME}
     try {
       await withTimeout(
         transporter.sendMail({
-          from: process.env.SMTP_MAIL_FROM,
+          from: getConfig("SMTP_MAIL_FROM"),
           to: email,
-          subject: `Чек ${process.env.APPNAME}`,
+          subject: `Чек ${getConfig("APPNAME")}`,
           html
         }),
-        SMTP_TIMEOUT_MS,
+        getSmtpTimeoutMs(),
         "Client email sending"
       );
     } catch (emailErr) {
@@ -383,6 +790,16 @@ ${process.env.APPNAME}
         error: emailErr.message || "Не удалось отправить email клиенту",
         technicalError
       });
+      await saveReceipt({
+        receiptId,
+        email,
+        items,
+        amount: total,
+        printLink,
+        status: "created",
+        emailSent: false,
+        emailError: technicalError
+      });
 
       return res.json({
         success: true,
@@ -395,6 +812,16 @@ ${process.env.APPNAME}
       });
     }
 
+    await saveReceipt({
+      receiptId,
+      email,
+      items,
+      amount: total,
+      printLink,
+      status: "created",
+      emailSent: true
+    });
+
     res.json({
       success: true,
       receiptCreated: true,
@@ -426,7 +853,14 @@ ${process.env.APPNAME}
   }
 });
 
+await loadRuntimeConfig();
+
+const PORT = getConfig("PORT", 4000);
+const HOST = getConfig("HOST", "0.0.0.0");
+
 app.listen(PORT, HOST, () => {
   console.log(`✅ Сервер запущен: http://${HOST}:${PORT}`);
   console.log(`📁 Файл ошибок: ${ERROR_FILE}`);
+  console.log(`🧾 Журнал чеков: ${RECEIPTS_FILE}`);
+  console.log(`⚙️ UI настройки: ${CONFIG_FILE}`);
 });