Cloudflare Workers に Express.js アプリケーションをデプロイする

DROP TABLE IF EXISTS members;
CREATE TABLE IF NOT EXISTS members (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  name TEXT NOT NULL,
  email TEXT NOT NULL UNIQUE,
  joined_date TEXT NOT NULL
);

-- Insert sample data
INSERT INTO members (name, email, joined_date) VALUES
  ('Alice Johnson', 'alice@example.com', '2024-01-15'),
  ('Bob Smith', 'bob@example.com', '2024-02-20'),
  ('Carol Williams', 'carol@example.com', '2024-03-10');

import { env } from "cloudflare:workers";
import { httpServerHandler } from "cloudflare:node";
import express from "express";

const app = express();

// Middleware to parse JSON bodies
app.use(express.json());

// Health check endpoint
app.get("/", (req, res) => {
	res.json({ message: "Express.js running on Cloudflare Workers!" });
});

app.listen(3000);
export default httpServerHandler({ port: 3000 });

// GET all members
app.get('/api/members', async (req, res) => {
	try {
		const { results } = await env.DB.prepare('SELECT * FROM members ORDER BY joined_date DESC').all();

		res.json({ success: true, members: results });
	} catch (error) {
		res.status(500).json({ success: false, error: 'Failed to fetch members' });
	}
});

// GET a single member by ID
app.get('/api/members/:id', async (req, res) => {
	try {
		const { id } = req.params;

		const { results } = await env.DB.prepare('SELECT * FROM members WHERE id = ?').bind(id).all();

		if (results.length === 0) {
			return res.status(404).json({ success: false, error: 'Member not found' });
		}

		res.json({ success: true, member: results[0] });
	} catch (error) {
		res.status(500).json({ success: false, error: 'Failed to fetch member' });
	}
});

// POST - Create a new member
app.post("/api/members", async (req, res) => {
  try {
    const { name, email } = req.body;

    // Validate input
    if (!name || !email) {
      return res.status(400).json({
        success: false,
        error: "Name and email are required",
      });
    }

    // Basic email validation (simplified for tutorial purposes)
    // For production, consider using a validation library or more comprehensive checks
    if (!email.includes("@") || !email.includes(".")) {
      return res.status(400).json({
        success: false,
        error: "Invalid email format",
      });
    }

    const joined_date = new Date().toISOString().split("T")[0];

    const result = await env.DB.prepare(
      "INSERT INTO members (name, email, joined_date) VALUES (?, ?, ?)"
    )
      .bind(name, email, joined_date)
      .run();

    if (result.success) {
      res.status(201).json({
        success: true,
        message: "Member created successfully",
        id: result.meta.last_row_id,
      });
    } else {
      res
        .status(500)
        .json({ success: false, error: "Failed to create member" });
    }
  } catch (error: any) {
    // Handle unique constraint violation
    if (error.message?.includes("UNIQUE constraint failed")) {
      return res.status(409).json({
        success: false,
        error: "Email already exists",
      });
    }
    res.status(500).json({ success: false, error: "Failed to create member" });
  }
});

app.put("/api/members/:id", async (req, res) => {
  try {
    const { id } = req.params;
    const { name, email } = req.body;

    // Validate input
    if (!name && !email) {
      return res.status(400).json({
        success: false,
        error: "At least one field (name or email) is required",
      });
    }

    // Basic email validation if provided (simplified for tutorial purposes)
    // For production, consider using a validation library or more comprehensive checks
    if (email && (!email.includes("@") || !email.includes("."))) {
      return res.status(400).json({
        success: false,
        error: "Invalid email format",
      });
    }

    // Build dynamic update query
    const updates: string[] = [];
    const values: any[] = [];

    if (name) {
      updates.push("name = ?");
      values.push(name);
    }
    if (email) {
      updates.push("email = ?");
      values.push(email);
    }

    values.push(id);

    const result = await env.DB.prepare(
      `UPDATE members SET ${updates.join(", ")} WHERE id = ?`
    )
      .bind(...values)
      .run();

    if (result.meta.changes === 0) {
      return res
        .status(404)
        .json({ success: false, error: "Member not found" });
    }

    res.json({ success: true, message: "Member updated successfully" });
  } catch (error: any) {
    if (error.message?.includes("UNIQUE constraint failed")) {
      return res.status(409).json({
        success: false,
        error: "Email already exists",
      });
    }
    res.status(500).json({ success: false, error: "Failed to update member" });
  }
});

// DELETE - Delete a member
app.delete("/api/members/:id", async (req, res) => {
  try {
    const { id } = req.params;

    const result = await env.DB.prepare("DELETE FROM members WHERE id = ?")
      .bind(id)
      .run();

    if (result.meta.changes === 0) {
      return res
        .status(404)
        .json({ success: false, error: "Member not found" });
    }

    res.json({ success: true, message: "Member deleted successfully" });
  } catch (error) {
    res.status(500).json({ success: false, error: "Failed to delete member" });
  }
});

curl http://localhost:8787/api/members

curl -X POST http://localhost:8787/api/members \
  -H "Content-Type: application/json" \
  -d '{"name": "David Brown", "email": "david@example.com"}'

curl http://localhost:8787/api/members/1

curl -X PUT http://localhost:8787/api/members/1 \
  -H "Content-Type: application/json" \
  -d '{"name": "Alice Cooper"}'

curl -X DELETE http://localhost:8787/api/members/4

curl https://<your-worker-url>/api/members

curl -X POST https://<your-worker-url>/api/members \
  -H "Content-Type: application/json" \
  -d '{"name": "Eva Martinez", "email": "eva@example.com"}'