Add OpenAPI products API

.env.example

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+# Copy file ini menjadi .env dan isi dengan connection string Neon kamu
+# Dapatkan connection string dari dashboard Neon: Overview → Connection Details
+
+DATABASE_URL=postgresql://username:password@ep-xxx-xxx-123456.us-east-2.aws.neon.tech/neondb?sslmode=require

.gitignore

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+.env
+__pycache__/
+*.pyc

app.py

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+"""
+Backend Flask — Products API
+"""
+import os
+import psycopg
+from flask import Flask, jsonify
+
+app = Flask(__name__)
+
+
+def get_db_connection():
+    """Membuat koneksi ke database Neon PostgreSQL."""
+    return psycopg.connect(os.environ["DATABASE_URL"])
+
+
+@app.get("/")
+def home():
+    """Cek apakah server hidup."""
+    return jsonify({"status": "ok", "message": "Products API is running"})
+
+
+@app.get("/products")
+def get_products():
+    """Mengambil semua produk dari database."""
+    conn = get_db_connection()
+    cur = conn.cursor()
+    cur.execute("SELECT id, name, price, stock FROM products ORDER BY id")
+    rows = cur.fetchall()
+    cur.close()
+    conn.close()
+
+    products = [
+        {"id": r[0], "name": r[1], "price": float(r[2]), "stock": r[3]}
+        for r in rows
+    ]
+    return jsonify(products)
+
+
+@app.get("/products/<int:product_id>")
+def get_product_by_id(product_id):
+    """Mengambil satu produk berdasarkan ID."""
+    conn = get_db_connection()
+    cur = conn.cursor()
+    cur.execute(
+        "SELECT id, name, price, stock FROM products WHERE id = %s",
+        (product_id,),
+    )
+    row = cur.fetchone()
+    cur.close()
+    conn.close()
+
+    if row is None:
+        return jsonify({"error": "Product not found"}), 404
+
+    product = {
+        "id": row[0],
+        "name": row[1],
+        "price": float(row[2]),
+        "stock": row[3],
+    }
+    return jsonify(product)
+
+
+@app.post("/products")
+def create_product():
+    """Menambah produk baru ke database."""
+    from flask import request
+
+    if not request.is_json:
+        return jsonify({"error": "Request must be JSON"}), 400
+
+    data = request.get_json()
+
+    for field in ("name", "price", "stock"):
+        if field not in data:
+            return jsonify({"error": f"{field} is required"}), 400
+
+    conn = get_db_connection()
+    cur = conn.cursor()
+    try:
+        cur.execute(
+            "INSERT INTO products (name, price, stock) VALUES (%s, %s, %s) "
+            "RETURNING id, name, price, stock",
+            (data["name"], data["price"], data["stock"]),
+        )
+        row = cur.fetchone()
+        conn.commit()
+    except Exception:
+        conn.rollback()
+        return jsonify({"error": "Invalid input"}), 400
+    finally:
+        cur.close()
+        conn.close()
+
+    product = {
+        "id": row[0],
+        "name": row[1],
+        "price": float(row[2]),
+        "stock": row[3],
+    }
+    return jsonify(product), 201
+
+
+@app.delete("/products/<int:product_id>")
+def delete_product(product_id):
+    """Menghapus satu produk berdasarkan ID."""
+    conn = get_db_connection()
+    cur = conn.cursor()
+
+    cur.execute("SELECT id FROM products WHERE id = %s", (product_id,))
+    if cur.fetchone() is None:
+        cur.close()
+        conn.close()
+        return jsonify({"error": "Product not found"}), 404
+
+    cur.execute("DELETE FROM products WHERE id = %s", (product_id,))
+    conn.commit()
+    cur.close()
+    conn.close()
+
+    return "", 204

openapi.yaml

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+openapi: 3.0.3
+info:
+  title: Products API
+  version: 1.0.0
+  description: API untuk mengelola data products pada database Neon
+
+servers:
+  - url: https://your-api-url.vercel.app
+    description: Vercel (sesuaikan dengan URL deploy kamu)
+
+paths:
+  /products:
+    get:
+      summary: Get all products
+      operationId: getProducts
+      description: Mengambil semua produk dari database
+      tags:
+        - Products
+      responses:
+        '200':
+          description: Daftar semua produk
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/Product'
+
+    post:
+      summary: Create a new product
+      operationId: createProduct
+      description: Menambah produk baru ke database
+      tags:
+        - Products
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/ProductInput'
+      responses:
+        '201':
+          description: Produk berhasil dibuat
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Product'
+        '400':
+          description: Input tidak valid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+  /products/{id}:
+    get:
+      summary: Get product by ID
+      operationId: getProductById
+      description: Mengambil satu produk berdasarkan ID
+      tags:
+        - Products
+      parameters:
+        - name: id
+          in: path
+          required: true
+          description: ID produk
+          schema:
+            type: integer
+      responses:
+        '200':
+          description: Produk ditemukan
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Product'
+        '400':
+          description: ID tidak valid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '404':
+          description: Produk tidak ditemukan
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+    delete:
+      summary: Delete a product
+      operationId: deleteProduct
+      description: Menghapus satu produk berdasarkan ID
+      tags:
+        - Products
+      parameters:
+        - name: id
+          in: path
+          required: true
+          description: ID produk
+          schema:
+            type: integer
+      responses:
+        '204':
+          description: Produk berhasil dihapus
+        '400':
+          description: ID tidak valid
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '404':
+          description: Produk tidak ditemukan
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+
+components:
+  schemas:
+    Product:
+      type: object
+      description: Representasi satu produk dari database
+      properties:
+        id:
+          type: integer
+          description: ID unik produk, auto-generated oleh database
+          example: 1
+        name:
+          type: string
+          description: Nama produk
+          maxLength: 100
+          example: "Laptop"
+        price:
+          type: number
+          description: Harga produk
+          example: 8500000.00
+        stock:
+          type: integer
+          description: Jumlah stok produk
+          example: 10
+      required:
+        - id
+        - name
+        - price
+        - stock
+
+    ProductInput:
+      type: object
+      description: Schema untuk request body saat menambahkan produk baru
+      properties:
+        name:
+          type: string
+          description: Nama produk
+          maxLength: 100
+          example: "Monitor"
+        price:
+          type: number
+          description: Harga produk
+          example: 1500000.00
+        stock:
+          type: integer
+          description: Jumlah stok produk
+          example: 5
+      required:
+        - name
+        - price
+        - stock
+
+    Error:
+      type: object
+      description: Schema untuk response error
+      properties:
+        error:
+          type: string
+          description: Pesan error
+          example: "Product not found"
+      required:
+        - error

requirements.txt

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+Flask>=3.0.0
+psycopg>=3.1.0
+python-dotenv>=1.0.0