初始化專案：租屋契約 PDF 產生器

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-05-15 12:04:54 +08:00
commit e1fcf3eb77
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--- a/.dockerignore
+++ b/.dockerignore
@@ -0,0 +1,7 @@
+node_modules
+npm-debug.log
+.git
+.gitignore
+tmp
+*.pdf
+*.log
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,4 @@
+node_modules/
+tmp/
+*.pdf
+*.log
--- a/24
+++ b/24
@@ -0,0 +1,24 @@
+FROM node:20-bookworm-slim
+
+RUN apt-get update \
+  && apt-get install -y --no-install-recommends \
+    libreoffice-writer \
+    fonts-noto-cjk \
+  && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY . .
+
+ENV NODE_ENV=production
+ENV PORT=3000
+ENV TEMPLATE_DIR=/app/templates
+ENV TEMP_DIR=/tmp/rental-contracts
+ENV SOFFICE_BIN=soffice
+
+EXPOSE 3000
+
+CMD ["npm", "start"]
--- a/README.MD
+++ b/README.MD
@@ -0,0 +1,118 @@
+# 租屋契約 PDF 產生器
+
+這是一個 Node.js 網頁工具，用指定的 Word `.doc` 範本產生租屋契約 PDF。網頁會帶入：
+
+- `{{每月租金}}`：預設 `8000`
+- `{{繳款日期}}`：預設 `18`
+- `{{保證金}}`：預設 `16000`
+
+產生流程：
+
+1. 從 `templates/` 複製指定的 `.doc` 範本到暫存資料夾。
+2. 替換暫存 `.doc` 裡的三個佔位符。
+3. 呼叫 LibreOffice headless 將暫存 `.doc` 轉成 PDF。
+4. 將 PDF 回傳給網頁下載；手機瀏覽器支援時可直接分享。
+5. 刪除暫存 `.doc` 與轉檔過程產生的檔案。
+
+## 專案結構
+
+```text
+.
+├─ public/                 # 前端網頁
+├─ src/contractService.js  # 複製範本、替換文字、轉 PDF
+├─ templates/              # 放 Word .doc 範本
+├─ server.js               # Express API
+├─ Dockerfile
+└─ README.MD
+```
+
+## 範本準備
+
+把 Word 範本放到 `templates/` 資料夾，範本內請保留以下文字：
+
+```text
+{{每月租金}}
+{{繳款日期}}
+{{保證金}}
+```
+
+目前程式針對舊版 `.doc` 以固定長度替換，填入的值不能比佔位符字數更長。金額與日期這類短數字可以正常使用。
+
+## 本機執行
+
+本機需要先安裝：
+
+- Node.js 20 或更新版本
+- LibreOffice，且 `soffice` 指令可在命令列執行
+
+安裝套件：
+
+```powershell
+npm install
+```
+
+啟動：
+
+```powershell
+npm start
+```
+
+開啟：
+
+```text
+http://localhost:3000
+```
+
+## Docker 執行
+
+建立 image：
+
+```powershell
+docker build -t rental-contract-pdf .
+```
+
+啟動 container：
+
+```powershell
+docker run --rm -p 3000:3000 rental-contract-pdf
+```
+
+若要把本機 `templates/` 掛進 container：
+
+```powershell
+docker run --rm -p 3000:3000 -v "${PWD}\templates:/app/templates" rental-contract-pdf
+```
+
+開啟：
+
+```text
+http://localhost:3000
+```
+
+## 手機下載或分享
+
+手機連到這個網站後，產生 PDF 時會優先使用瀏覽器的檔案分享功能。若瀏覽器或連線環境不支援檔案分享，網頁會保留下載 PDF 按鈕。
+
+注意：多數手機瀏覽器的檔案分享功能需要 HTTPS 或 localhost。若用區網 IP 開啟，例如 `http://192.168.x.x:3000`，可能只能下載，不能直接分享。
+
+## API
+
+產生 PDF：
+
+```http
+POST /api/contracts/pdf
+Content-Type: application/json
+```
+
+Body：
+
+```json
+{
+  "template": "租屋契約-內容_逢甲 A.doc",
+  "monthlyRent": "8000",
+  "paymentDay": "18",
+  "deposit": "16000"
+}
+```
+
+成功時會回傳 `application/pdf`。
--- a/package-lock.json
+++ b/package-lock.json
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+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    }
+  }
+}
--- a/package.json
+++ b/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "rental-contract-pdf",
+  "version": "1.0.0",
+  "description": "用 Node.js 產生租屋契約 PDF",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js",
+    "dev": "node --watch server.js"
+  },
+  "dependencies": {
+    "express": "^4.21.2"
+  },
+  "engines": {
+    "node": ">=20"
+  }
+}
--- a/public/app.js
+++ b/public/app.js
@@ -0,0 +1,166 @@
+const form = document.querySelector('#contractForm');
+const templateSelect = document.querySelector('#template');
+const submitButton = document.querySelector('#submitButton');
+const downloadButton = document.querySelector('#downloadButton');
+const shareButton = document.querySelector('#shareButton');
+const message = document.querySelector('#message');
+const resultTitle = document.querySelector('#resultTitle');
+const connectionStatus = document.querySelector('#connectionStatus');
+
+let currentPdfBlob = null;
+let currentPdfFileName = '租屋契約.pdf';
+
+loadTemplates();
+
+form.addEventListener('submit', async (event) => {
+  event.preventDefault();
+  setBusy(true);
+  resetPdf();
+
+  try {
+    const formData = new FormData(form);
+    const response = await fetch('/api/contracts/pdf', {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({
+        template: formData.get('template'),
+        monthlyRent: formData.get('monthlyRent'),
+        paymentDay: formData.get('paymentDay'),
+        deposit: formData.get('deposit'),
+      }),
+    });
+
+    if (!response.ok) {
+      const errorBody = await response.json().catch(() => ({}));
+      throw new Error(errorBody.error || 'PDF 產生失敗。');
+    }
+
+    currentPdfBlob = await response.blob();
+    currentPdfFileName = getFileNameFromDisposition(response.headers.get('Content-Disposition'))
+      || buildDefaultFileName(formData.get('template'));
+
+    resultTitle.textContent = 'PDF 已產生';
+    message.textContent = currentPdfFileName;
+    downloadButton.disabled = false;
+    shareButton.disabled = !canShareCurrentPdf();
+  } catch (error) {
+    resultTitle.textContent = '產生失敗';
+    message.textContent = error.message;
+  } finally {
+    setBusy(false);
+  }
+});
+
+downloadButton.addEventListener('click', () => {
+  if (!currentPdfBlob) {
+    return;
+  }
+  downloadPdf();
+});
+
+shareButton.addEventListener('click', async () => {
+  if (!currentPdfBlob) {
+    return;
+  }
+
+  const file = new File([currentPdfBlob], currentPdfFileName, { type: 'application/pdf' });
+  if (!navigator.canShare || !navigator.canShare({ files: [file] })) {
+    downloadPdf();
+    return;
+  }
+
+  try {
+    await navigator.share({
+      title: '租屋契約 PDF',
+      files: [file],
+    });
+  } catch (error) {
+    if (error.name !== 'AbortError') {
+      message.textContent = '分享失敗，已保留下載按鈕。';
+    }
+  }
+});
+
+async function loadTemplates() {
+  try {
+    const response = await fetch('/api/templates');
+    if (!response.ok) {
+      throw new Error('無法讀取範本。');
+    }
+
+    const body = await response.json();
+    templateSelect.replaceChildren(
+      ...body.templates.map((name) => new Option(name, name)),
+    );
+
+    if (body.templates.length === 0) {
+      templateSelect.append(new Option('templates 資料夾沒有 .doc 範本', ''));
+      templateSelect.disabled = true;
+      submitButton.disabled = true;
+      connectionStatus.textContent = '缺少範本';
+      message.textContent = '請先將 .doc 範本放進 templates 資料夾。';
+      return;
+    }
+
+    connectionStatus.textContent = '可使用';
+  } catch (error) {
+    templateSelect.append(new Option('讀取失敗', ''));
+    templateSelect.disabled = true;
+    submitButton.disabled = true;
+    connectionStatus.textContent = '離線';
+    message.textContent = error.message;
+  }
+}
+
+function setBusy(isBusy) {
+  submitButton.disabled = isBusy || templateSelect.disabled;
+  submitButton.textContent = isBusy ? '產生中' : '產生 PDF';
+}
+
+function resetPdf() {
+  currentPdfBlob = null;
+  downloadButton.disabled = true;
+  shareButton.disabled = true;
+  resultTitle.textContent = '產生中';
+  message.textContent = '正在建立 PDF。';
+}
+
+function canShareCurrentPdf() {
+  if (!currentPdfBlob || !navigator.canShare) {
+    return false;
+  }
+  const file = new File([currentPdfBlob], currentPdfFileName, { type: 'application/pdf' });
+  return navigator.canShare({ files: [file] });
+}
+
+function downloadPdf() {
+  const url = URL.createObjectURL(currentPdfBlob);
+  const link = document.createElement('a');
+  link.href = url;
+  link.download = currentPdfFileName;
+  document.body.append(link);
+  link.click();
+  link.remove();
+  URL.revokeObjectURL(url);
+}
+
+function getFileNameFromDisposition(disposition) {
+  if (!disposition) {
+    return '';
+  }
+
+  const utf8Match = disposition.match(/filename\*=UTF-8''([^;]+)/i);
+  if (utf8Match) {
+    return decodeURIComponent(utf8Match[1]);
+  }
+
+  const asciiMatch = disposition.match(/filename="([^"]+)"/i);
+  return asciiMatch ? asciiMatch[1] : '';
+}
+
+function buildDefaultFileName(templateName) {
+  const baseName = String(templateName || '租屋契約').replace(/\.[^.]+$/, '');
+  return `${baseName}.pdf`;
+}
--- a/public/index.html
+++ b/public/index.html
@@ -0,0 +1,69 @@
+<!doctype html>
+<html lang="zh-Hant">
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>租屋契約 PDF 產生器</title>
+    <link rel="stylesheet" href="/styles.css">
+  </head>
+  <body>
+    <main class="app-shell">
+      <header class="topbar">
+        <div>
+          <p class="eyebrow">Word to PDF</p>
+          <h1>租屋契約 PDF 產生器</h1>
+        </div>
+        <span id="connectionStatus" class="status-pill">連線中</span>
+      </header>
+
+      <section class="workspace" aria-label="租屋契約資料">
+        <form id="contractForm" class="tool-panel">
+          <label class="field">
+            <span>Word 範本</span>
+            <select id="template" name="template" required></select>
+          </label>
+
+          <div class="field-grid">
+            <label class="field">
+              <span>每月租金</span>
+              <input name="monthlyRent" type="number" inputmode="numeric" min="1" step="1" value="8000" required>
+            </label>
+
+            <label class="field">
+              <span>繳款日期</span>
+              <input name="paymentDay" type="number" inputmode="numeric" min="1" max="31" step="1" value="18" required>
+            </label>
+
+            <label class="field">
+              <span>保證金</span>
+              <input name="deposit" type="number" inputmode="numeric" min="1" step="1" value="16000" required>
+            </label>
+          </div>
+
+          <button id="submitButton" class="primary-button" type="submit">
+            產生 PDF
+          </button>
+        </form>
+
+        <section class="result-panel" aria-label="PDF 結果">
+          <div>
+            <p class="eyebrow">PDF</p>
+            <h2 id="resultTitle">尚未產生</h2>
+            <p id="message" class="message">請輸入資料後產生 PDF。</p>
+          </div>
+
+          <div class="result-actions">
+            <button id="downloadButton" class="secondary-button" type="button" disabled>
+              下載 PDF
+            </button>
+            <button id="shareButton" class="secondary-button" type="button" disabled>
+              分享 PDF
+            </button>
+          </div>
+        </section>
+      </section>
+    </main>
+
+    <script src="/app.js" defer></script>
+  </body>
+</html>
--- a/public/styles.css
+++ b/public/styles.css
@@ -0,0 +1,214 @@
+:root {
+  color-scheme: light;
+  --bg: #f6f8f7;
+  --surface: #ffffff;
+  --surface-muted: #eef4f1;
+  --border: #cfdbd5;
+  --text: #18201d;
+  --muted: #64716b;
+  --accent: #0f766e;
+  --accent-hover: #0b5f59;
+  --warning: #9a5b00;
+  --shadow: 0 18px 45px rgba(15, 35, 30, 0.08);
+}
+
+* {
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+  min-height: 100vh;
+  background:
+    linear-gradient(180deg, #ffffff 0, var(--bg) 260px),
+    var(--bg);
+  color: var(--text);
+  font-family: "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
+}
+
+button,
+input,
+select {
+  font: inherit;
+}
+
+.app-shell {
+  width: min(1080px, calc(100% - 32px));
+  margin: 0 auto;
+  padding: 32px 0;
+}
+
+.topbar {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 20px;
+  margin-bottom: 24px;
+}
+
+.eyebrow {
+  margin: 0 0 6px;
+  color: var(--accent);
+  font-size: 0.78rem;
+  font-weight: 700;
+  text-transform: uppercase;
+}
+
+h1,
+h2 {
+  margin: 0;
+  letter-spacing: 0;
+}
+
+h1 {
+  font-size: clamp(1.7rem, 2.3vw, 2.45rem);
+}
+
+h2 {
+  font-size: 1.35rem;
+}
+
+.status-pill {
+  flex: 0 0 auto;
+  min-width: 76px;
+  border: 1px solid var(--border);
+  border-radius: 999px;
+  background: var(--surface-muted);
+  padding: 7px 12px;
+  color: var(--muted);
+  font-size: 0.9rem;
+  text-align: center;
+}
+
+.workspace {
+  display: grid;
+  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
+  gap: 20px;
+  align-items: start;
+}
+
+.tool-panel,
+.result-panel {
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  background: var(--surface);
+  box-shadow: var(--shadow);
+}
+
+.tool-panel {
+  display: grid;
+  gap: 18px;
+  padding: 22px;
+}
+
+.field-grid {
+  display: grid;
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  gap: 14px;
+}
+
+.field {
+  display: grid;
+  gap: 8px;
+  color: var(--muted);
+  font-size: 0.92rem;
+  font-weight: 700;
+}
+
+.field input,
+.field select {
+  width: 100%;
+  min-height: 46px;
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  background: #ffffff;
+  color: var(--text);
+  padding: 10px 12px;
+  outline: none;
+}
+
+.field input:focus,
+.field select:focus {
+  border-color: var(--accent);
+  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.15);
+}
+
+.primary-button,
+.secondary-button {
+  min-height: 46px;
+  border: 0;
+  border-radius: 6px;
+  padding: 0 16px;
+  cursor: pointer;
+  font-weight: 800;
+}
+
+.primary-button {
+  justify-self: start;
+  min-width: 150px;
+  background: var(--accent);
+  color: #ffffff;
+}
+
+.primary-button:hover:not(:disabled) {
+  background: var(--accent-hover);
+}
+
+.secondary-button {
+  border: 1px solid var(--border);
+  background: #ffffff;
+  color: var(--text);
+}
+
+.primary-button:disabled,
+.secondary-button:disabled {
+  cursor: not-allowed;
+  opacity: 0.55;
+}
+
+.result-panel {
+  display: grid;
+  gap: 24px;
+  min-height: 216px;
+  padding: 22px;
+}
+
+.message {
+  min-height: 46px;
+  margin: 10px 0 0;
+  color: var(--muted);
+  line-height: 1.6;
+  overflow-wrap: anywhere;
+}
+
+.result-actions {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 10px;
+  align-self: end;
+}
+
+@media (max-width: 760px) {
+  .app-shell {
+    width: min(100% - 24px, 560px);
+    padding: 20px 0;
+  }
+
+  .topbar,
+  .workspace,
+  .field-grid {
+    grid-template-columns: 1fr;
+  }
+
+  .topbar {
+    display: grid;
+  }
+
+  .status-pill {
+    justify-self: start;
+  }
+
+  .primary-button {
+    width: 100%;
+  }
+}
--- a/server.js
+++ b/server.js
@@ -0,0 +1,60 @@
+const express = require('express');
+const path = require('node:path');
+const {
+  createContractPdf,
+  listTemplates,
+} = require('./src/contractService');
+
+const app = express();
+const port = Number(process.env.PORT || 3005);
+
+app.use(express.json({ limit: '1mb' }));
+app.use(express.static(path.join(__dirname, 'public')));
+
+app.get('/api/health', (_req, res) => {
+  res.json({ ok: true });
+});
+
+app.get('/api/templates', async (_req, res, next) => {
+  try {
+    res.json({ templates: await listTemplates() });
+  } catch (error) {
+    next(error);
+  }
+});
+
+app.post('/api/contracts/pdf', async (req, res) => {
+  try {
+    const result = await createContractPdf({
+      template: req.body.template,
+      monthlyRent: req.body.monthlyRent,
+      paymentDay: req.body.paymentDay,
+      deposit: req.body.deposit,
+    });
+
+    res.setHeader('Content-Type', 'application/pdf');
+    res.setHeader(
+      'Content-Disposition',
+      `attachment; filename="rental-contract.pdf"; filename*=UTF-8''${encodeURIComponent(result.fileName)}`,
+    );
+    res.setHeader('Cache-Control', 'no-store');
+    res.send(result.buffer);
+  } catch (error) {
+    console.error(error);
+    const status = error.exposeToClient ? 400 : 500;
+    res.status(status).json({
+      error: error.exposeToClient
+        ? error.message
+        : 'PDF 產生失敗，請確認 LibreOffice 已安裝且範本格式正確。',
+    });
+  }
+});
+
+app.use((error, _req, res, _next) => {
+  console.error(error);
+  res.status(500).json({ error: '伺服器發生錯誤。' });
+});
+
+app.listen(port, () => {
+  console.log(`Rental contract PDF app is running at http://localhost:${port}`);
+});
--- a/src/contractService.js
+++ b/src/contractService.js
@@ -0,0 +1,260 @@
+const crypto = require('node:crypto');
+const fs = require('node:fs/promises');
+const os = require('node:os');
+const path = require('node:path');
+const { spawn } = require('node:child_process');
+const { pathToFileURL } = require('node:url');
+
+const TEMPLATE_DIR = path.resolve(process.env.TEMPLATE_DIR || path.join(process.cwd(), 'templates'));
+const TEMP_DIR = path.resolve(process.env.TEMP_DIR || path.join(os.tmpdir(), 'rental-contracts'));
+const SOFFICE_BIN = process.env.SOFFICE_BIN || 'soffice';
+const SUPPORTED_TEMPLATE_EXTENSIONS = new Set(['.doc']);
+
+const PLACEHOLDERS = [
+  ['{{每月租金}}', 'monthlyRent', '每月租金'],
+  ['{{繳款日期}}', 'paymentDay', '繳款日期'],
+  ['{{保證金}}', 'deposit', '保證金'],
+];
+
+async function listTemplates() {
+  await fs.mkdir(TEMPLATE_DIR, { recursive: true });
+  const entries = await fs.readdir(TEMPLATE_DIR, { withFileTypes: true });
+
+  return entries
+    .filter((entry) => entry.isFile())
+    .filter((entry) => SUPPORTED_TEMPLATE_EXTENSIONS.has(path.extname(entry.name).toLowerCase()))
+    .map((entry) => entry.name)
+    .sort((a, b) => a.localeCompare(b, 'zh-Hant'));
+}
+
+async function createContractPdf(input) {
+  const values = normalizeContractInput(input);
+  const templatePath = await resolveTemplatePath(input.template);
+  const workDir = await createWorkDir();
+
+  try {
+    const extension = path.extname(templatePath);
+    const copiedDocPath = path.join(workDir, `contract-${crypto.randomUUID()}${extension}`);
+
+    await fs.copyFile(templatePath, copiedDocPath);
+    const replacementCounts = await applyPlaceholdersToDoc(copiedDocPath, values);
+    assertAllPlaceholdersWereFound(replacementCounts);
+
+    const pdfPath = await convertToPdf(copiedDocPath, workDir);
+    const buffer = await fs.readFile(pdfPath);
+
+    return {
+      buffer,
+      fileName: buildPdfFileName(templatePath),
+    };
+  } finally {
+    await removeWorkDir(workDir);
+  }
+}
+
+function normalizeContractInput(input) {
+  return {
+    monthlyRent: normalizePositiveInteger(input.monthlyRent, '每月租金'),
+    paymentDay: normalizePaymentDay(input.paymentDay),
+    deposit: normalizePositiveInteger(input.deposit, '保證金'),
+  };
+}
+
+function normalizePositiveInteger(value, label) {
+  const text = String(value ?? '').trim();
+  if (!/^[1-9]\d*$/.test(text)) {
+    throwClientError(`${label}只能輸入正整數。`);
+  }
+  return text;
+}
+
+function normalizePaymentDay(value) {
+  const text = String(value ?? '').trim();
+  const day = Number(text);
+  if (!/^\d+$/.test(text) || day < 1 || day > 31) {
+    throwClientError('繳款日期只能輸入 1 到 31。');
+  }
+  return text;
+}
+
+async function resolveTemplatePath(templateName) {
+  const name = String(templateName ?? '').trim();
+  if (!name) {
+    throwClientError('請選擇 Word 範本。');
+  }
+
+  if (name !== path.basename(name)) {
+    throwClientError('範本檔名不正確。');
+  }
+
+  const templatePath = path.resolve(TEMPLATE_DIR, name);
+  if (!isInsideDirectory(TEMPLATE_DIR, templatePath)) {
+    throwClientError('範本路徑不正確。');
+  }
+
+  if (!SUPPORTED_TEMPLATE_EXTENSIONS.has(path.extname(templatePath).toLowerCase())) {
+    throwClientError('目前僅支援 .doc 範本。');
+  }
+
+  try {
+    await fs.access(templatePath);
+  } catch {
+    throwClientError('找不到指定的 Word 範本。');
+  }
+
+  return templatePath;
+}
+
+async function createWorkDir() {
+  const workDir = path.resolve(TEMP_DIR, crypto.randomUUID());
+  if (!isInsideDirectory(TEMP_DIR, workDir)) {
+    throw new Error('Temporary directory resolved outside of TEMP_DIR.');
+  }
+  await fs.mkdir(workDir, { recursive: true });
+  return workDir;
+}
+
+async function removeWorkDir(workDir) {
+  if (!workDir || !isInsideDirectory(TEMP_DIR, workDir)) {
+    return;
+  }
+  await fs.rm(workDir, { recursive: true, force: true });
+}
+
+async function applyPlaceholdersToDoc(docPath, values) {
+  const buffer = await fs.readFile(docPath);
+  const counts = new Map();
+
+  for (const [placeholder, key, label] of PLACEHOLDERS) {
+    const value = values[key];
+    if ([...value].length > [...placeholder].length) {
+      throwClientError(`${label}的字數不可超過 ${[...placeholder].length} 個字。`);
+    }
+
+    counts.set(placeholder, replaceUtf16Le(buffer, placeholder, value));
+  }
+
+  await fs.writeFile(docPath, buffer);
+  return counts;
+}
+
+function replaceUtf16Le(buffer, placeholder, value) {
+  const search = Buffer.from(placeholder, 'utf16le');
+  const replacement = Buffer.from(value.padEnd([...placeholder].length, ' '), 'utf16le');
+  let count = 0;
+  let index = buffer.indexOf(search);
+
+  while (index !== -1) {
+    replacement.copy(buffer, index);
+    count += 1;
+    index = buffer.indexOf(search, index + replacement.length);
+  }
+
+  return count;
+}
+
+function assertAllPlaceholdersWereFound(replacementCounts) {
+  const missing = [...replacementCounts.entries()]
+    .filter(([, count]) => count === 0)
+    .map(([placeholder]) => placeholder);
+
+  if (missing.length > 0) {
+    throwClientError(`範本缺少佔位符：${missing.join('、')}`);
+  }
+}
+
+async function convertToPdf(inputPath, outputDir) {
+  const libreOfficeProfileDir = path.join(outputDir, 'lo-profile');
+  await fs.mkdir(libreOfficeProfileDir, { recursive: true });
+
+  const args = [
+    `-env:UserInstallation=${pathToFileURL(libreOfficeProfileDir).href}`,
+    '--headless',
+    '--nologo',
+    '--nofirststartwizard',
+    '--nolockcheck',
+    '--convert-to',
+    'pdf',
+    '--outdir',
+    outputDir,
+    inputPath,
+  ];
+
+  await runProcess(SOFFICE_BIN, args);
+
+  const expectedPdfPath = path.join(
+    outputDir,
+    `${path.basename(inputPath, path.extname(inputPath))}.pdf`,
+  );
+
+  try {
+    await fs.access(expectedPdfPath);
+    return expectedPdfPath;
+  } catch {
+    const files = await fs.readdir(outputDir);
+    const pdf = files.find((file) => path.extname(file).toLowerCase() === '.pdf');
+    if (pdf) {
+      return path.join(outputDir, pdf);
+    }
+    throw new Error('LibreOffice did not create a PDF file.');
+  }
+}
+
+function runProcess(command, args) {
+  return new Promise((resolve, reject) => {
+    const child = spawn(command, args, {
+      windowsHide: true,
+      env: process.env,
+    });
+
+    let stdout = '';
+    let stderr = '';
+
+    child.stdout.on('data', (chunk) => {
+      stdout += chunk.toString();
+    });
+
+    child.stderr.on('data', (chunk) => {
+      stderr += chunk.toString();
+    });
+
+    child.on('error', (error) => {
+      reject(new Error(`無法執行 LibreOffice (${command})：${error.message}`));
+    });
+
+    child.on('close', (code) => {
+      if (code === 0) {
+        resolve();
+        return;
+      }
+
+      reject(new Error(`LibreOffice 轉檔失敗：${stderr || stdout || `exit code ${code}`}`));
+    });
+  });
+}
+
+function buildPdfFileName(templatePath) {
+  const baseName = path.basename(templatePath, path.extname(templatePath));
+  const timestamp = new Date()
+    .toISOString()
+    .replace(/[-:]/g, '')
+    .replace(/\.\d{3}Z$/, '');
+
+  return `${baseName}-${timestamp}.pdf`;
+}
+
+function isInsideDirectory(parentDir, targetPath) {
+  const relative = path.relative(path.resolve(parentDir), path.resolve(targetPath));
+  return Boolean(relative) && !relative.startsWith('..') && !path.isAbsolute(relative);
+}
+
+function throwClientError(message) {
+  const error = new Error(message);
+  error.exposeToClient = true;
+  throw error;
+}
+
+module.exports = {
+  createContractPdf,
+  listTemplates,
+};
--- a/templates/租屋契約-內容_逢甲
+++ b/templates/租屋契約-內容_逢甲
--- a/A.doc
+++ b/A.doc