生产级多平台代码库

Below is a “production‑ready” sample codebase that you can use as a starting point for your integrated multi‑sector platform. This includes one complete Next.js website and one complete Expo (React Native) mobile app. (Keep in mind that “production‑ready” projects typically require additional work—such as real database integration, security hardening, API key management, and rigorous testing—but the code below is structured and annotated so you can quickly build on it.)

> Note:
– Replace dummy API logic with your real business logic.
– Update environment variables (for example, in a .env.local file for Next.js).
– For authentication, this example uses Next‑Auth (for the website) and simple navigation for the mobile app.
– Some components (like the AR view or IoT integrations) are placeholders for you to integrate real SDKs or APIs.




---

PART I – WEBSITE (Next.js)

Project Structure

/pesaflow-website
├── components
│   ├── AgriMap.tsx
│   ├── Layout.tsx
│   └── SolarARView.tsx
├── lib
│   └── db.ts
├── pages
│   ├── _app.tsx
│   ├── index.tsx
│   ├── register.tsx
│   ├── dashboard.tsx
│   ├── loan-application.tsx
│   ├── agri-marketplace.tsx
│   ├── solar.tsx
│   ├── real-estate.tsx
│   ├── marketplace.tsx
│   ├── vendor-register.tsx
│   └── product
│       └── [id].tsx
└── pages/api
    ├── register.ts
    ├── loan.ts
    ├── products.ts
    └── vendor-register.ts


---

1. package.json

{
  "name": "pesaflow-website",
  "version": "1.0.0",
  "scripts": {
    "dev": "next dev",
    "build": "next build",
    "start": "next start",
    "lint": "next lint"
  },
  "dependencies": {
    "axios": "^1.4.0",
    "next": "^13.4.1",
    "next-auth": "^4.22.1",
    "react": "^18.2.0",
    "react-dom": "^18.2.0"
  },
  "devDependencies": {
    "@types/node": "^18.15.0",
    "@types/react": "^18.0.28",
    "typescript": "^5.0.4"
  }
}


---

2. tsconfig.json

{
  "compilerOptions": {
    "target": "ES6",
    "lib": ["dom", "dom.iterable", "esnext"],
    "allowJs": true,
    "skipLibCheck": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "noEmit": true,
    "esModuleInterop": true,
    "module": "ESNext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "jsx": "preserve",
    "incremental": true
  },
  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx"],
  "exclude": ["node_modules"]
}


---

3. pages/_app.tsx

Wrap the app in a global layout and session provider (for Next‑Auth).

// pages/_app.tsx
import { SessionProvider } from "next-auth/react";
import type { AppProps } from "next/app";
import Layout from "../components/Layout";
import "../styles/globals.css";

export default function MyApp({ Component, pageProps: { session, ...pageProps } }: AppProps) {
  return (
    <SessionProvider session={session}>
      <Layout>
        <Component {...pageProps} />
      </Layout>
    </SessionProvider>
  );
}


---

4. pages/index.tsx

Landing page that introduces your integrated platform.

// pages/index.tsx
import Link from "next/link";

export default function Home() {
  return (
    <div style={{ padding: "2rem", fontFamily: "Arial" }}>
      <h1>Welcome to PesaFlow</h1>
      <p>
        The ultimate multi‑sector economic platform integrating fintech, e‑commerce, AgriTech, energy, and real estate.
      </p>
      <nav>
        <Link href="/register">Register</Link> |{" "}
        <Link href="/dashboard">Dashboard</Link> |{" "}
        <Link href="/marketplace">Marketplace</Link>
      </nav>
      <hr />
      <h2>Our Services</h2>
      <ul>
        <li><Link href="/loan-application">Micro‑Lending</Link></li>
        <li><Link href="/agri-marketplace">Smart Farming</Link></li>
        <li><Link href="/solar">Solar Leasing</Link></li>
        <li><Link href="/real-estate">Real Estate Crowdfunding</Link></li>
      </ul>
    </div>
  );
}


---

5. pages/register.tsx

User registration form.

// pages/register.tsx
import { useState } from "react";
import axios from "axios";
import { useRouter } from "next/router";

export default function Register() {
  const router = useRouter();
  const [formData, setFormData] = useState({
    name: "",
    phone: "",
    nationalId: "",
    email: "",
    password: ""
  });
  const [message, setMessage] = useState("");

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    try {
      const res = await axios.post("/api/register", formData);
      setMessage(res.data.message);
      setTimeout(() => router.push("/dashboard"), 1000);
    } catch (error) {
      setMessage("Registration failed.");
    }
  };

  return (
    <div style={{ padding: "2rem", fontFamily: "Arial" }}>
      <h1>User Registration</h1>
      {message && <p>{message}</p>}
      <form onSubmit={handleSubmit}>
        <div>
          <label>Name: </label>
          <input type="text" required value={formData.name}
            onChange={(e) => setFormData({ ...formData, name: e.target.value })} />
        </div>
        <div>
          <label>Phone: </label>
          <input type="text" required value={formData.phone}
            onChange={(e) => setFormData({ ...formData, phone: e.target.value })} />
        </div>
        <div>
          <label>National ID: </label>
          <input type="text" required value={formData.nationalId}
            onChange={(e) => setFormData({ ...formData, nationalId: e.target.value })} />
        </div>
        <div>
          <label>Email: </label>
          <input type="email" required value={formData.email}
            onChange={(e) => setFormData({ ...formData, email: e.target.value })} />
        </div>
        <div>
          <label>Password: </label>
          <input type="password" required value={formData.password}
            onChange={(e) => setFormData({ ...formData, password: e.target.value })} />
        </div>
        <button type="submit">Register</button>
      </form>
    </div>
  );
}


---

6. pages/dashboard.tsx

A secure dashboard that shows available modules (requires authentication in production).

// pages/dashboard.tsx
import { useSession, signOut } from "next-auth/react";
import Link from "next/link";

export default function Dashboard() {
  const { data: session } = useSession();

  return (
    <div style={{ padding: "2rem", fontFamily: "Arial" }}>
      <h1>User Dashboard</h1>
      {session ? (
        <>
          <p>Welcome, {session.user?.name}!</p>
          <button onClick={() => signOut()}>Sign Out</button>
          <ul>
            <li><Link href="/loan-application">Micro‑Lending</Link></li>
            <li><Link href="/agri-marketplace">Smart Farming</Link></li>
            <li><Link href="/solar">Solar Leasing</Link></li>
            <li><Link href="/real-estate">Real Estate Crowdfunding</Link></li>
            <li><Link href="/marketplace">Marketplace</Link></li>
            <li><Link href="/vendor-register">Vendor Registration</Link></li>
          </ul>
        </>
      ) : (
        <p>Please sign in to view your dashboard.</p>
      )}
    </div>
  );
}


---

7. pages/loan-application.tsx

Micro‑lending application form with dummy processing.

// pages/loan-application.tsx
import { useState } from "react";
import axios from "axios";

export default function LoanApplication() {
  const [amount, setAmount] = useState("");
  const [message, setMessage] = useState("");

  const handleLoanApplication = async (e: React.FormEvent) => {
    e.preventDefault();
    try {
      const res = await axios.post("/api/loan", { amount });
      setMessage(res.data.message);
    } catch (error) {
      setMessage("Loan application failed.");
    }
  };

  return (
    <div style={{ padding: "2rem", fontFamily: "Arial" }}>
      <h1>Micro‑Lending</h1>
      {message && <p>{message}</p>}
      <form onSubmit={handleLoanApplication}>
        <div>
          <label>Loan Amount (Ksh): </label>
          <input type="number" required value={amount}
            onChange={(e) => setAmount(e.target.value)} />
        </div>
        <button type="submit">Apply for Loan</button>
      </form>
    </div>
  );
}


---

8. pages/agri-marketplace.tsx

Smart farming page that uses dynamic components.

// pages/agri-marketplace.tsx
import dynamic from "next/dynamic";

// Dynamically import AgriMap (client‑side only)
const AgriMap = dynamic(() => import("../components/AgriMap"), { ssr: false });

export default function AgriMarketplace() {
  const dummyUser = { id: "FARMER123" };
  return (
    <div style={{ padding: "2rem", fontFamily: "Arial" }}>
      <h1>Smart Farming Dashboard</h1>
      <AgriMap 
        soilData={[]}      // Replace with actual IoT data
        weather={null}     // Replace with actual weather data
        marketPrices={null} // Replace with market data
      />
      <div>
        <h2>AI Agronomist Recommendations</h2>
        <p>For Farmer {dummyUser.id}: Increase irrigation by 10% today.</p>
      </div>
    </div>
  );
}


---

9. pages/solar.tsx

Solar leasing page with an AR view placeholder.

// pages/solar.tsx
import dynamic from "next/dynamic";

// Dynamically load the AR view (client‑side only)
const SolarARView = dynamic(() => import("../components/SolarARView"), { ssr: false });

export default function SolarLeasing() {
  return (
    <div style={{ padding: "2rem", fontFamily: "Arial" }}>
      <h1>Solar Leasing</h1>
      <p>Experience interactive 3D views of solar panels and calculate your lease plan.</p>
      <SolarARView />
      <div>
        <h2>Lease Calculator</h2>
        <p>Lease details and pricing calculator coming soon.</p>
      </div>
    </div>
  );
}


---

10. pages/real-estate.tsx

Real estate crowdfunding module with blockchain integration hints.

// pages/real-estate.tsx
export default function RealEstateCrowdfunding() {
  return (
    <div style={{ padding: "2rem", fontFamily: "Arial" }}>
      <h1>Real Estate Crowdfunding</h1>
      <p>Invest in tokenized property projects and enjoy transparent ownership via blockchain.</p>
      <button onClick={() => alert("Investment functionality coming soon!")}>
        Invest Now
      </button>
    </div>
  );
}


---

11. pages/marketplace.tsx

Online marketplace listing products.

// pages/marketplace.tsx
import { useEffect, useState } from "react";
import Link from "next/link";
import axios from "axios";

export default function Marketplace() {
  const [products, setProducts] = useState([]);

  useEffect(() => {
    axios.get("/api/products").then((res) => {
      setProducts(res.data.products);
    }).catch(console.error);
  }, []);

  return (
    <div style={{ padding: "2rem", fontFamily: "Arial" }}>
      <h1>Online Marketplace</h1>
      <ul>
        {products.map((p: any) => (
          <li key={p.id}>
            <Link href={`/product/${p.id}`}>
              <a>{p.name} - Ksh {p.price}</a>
            </Link>
          </li>
        ))}
      </ul>
    </div>
  );
}


---

12. pages/product/[id].tsx

Dynamic route to show product details.

// pages/product/[id].tsx
import { useRouter } from "next/router";
import { useEffect, useState } from "react";
import axios from "axios";

export default function ProductDetail() {
  const router = useRouter();
  const { id } = router.query;
  const [product, setProduct] = useState<any>(null);

  useEffect(() => {
    if (id) {
      axios.get("/api/products").then((res) => {
        const prod = res.data.products.find((p: any) => p.id === id);
        setProduct(prod);
      }).catch(console.error);
    }
  }, [id]);

  if (!product) return <p>Loading product details…</p>;

  return (
    <div style={{ padding: "2rem", fontFamily: "Arial" }}>
      <h1>{product.name}</h1>
      <p>Price: Ksh {product.price}</p>
      <p>Description: {product.description}</p>
      <button onClick={() => alert("Add to Cart functionality coming soon!")}>
        Add to Cart
      </button>
    </div>
  );
}


---

13. pages/vendor-register.tsx

Vendor registration form for marketplace sellers.

// pages/vendor-register.tsx
import { useState } from "react";
import axios from "axios";
import { useRouter } from "next/router";

export default function VendorRegister() {
  const router = useRouter();
  const [formData, setFormData] = useState({
    vendorName: "",
    contact: "",
    email: ""
  });
  const [message, setMessage] = useState("");

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    try {
      const res = await axios.post("/api/vendor-register", formData);
      setMessage(res.data.message);
      setTimeout(() => router.push("/dashboard"), 1000);
    } catch (error) {
      setMessage("Vendor registration failed.");
    }
  };

  return (
    <div style={{ padding: "2rem", fontFamily: "Arial" }}>
      <h1>Vendor Registration</h1>
      {message && <p>{message}</p>}
      <form onSubmit={handleSubmit}>
        <div>
          <label>Vendor Name: </label>
          <input type="text" required value={formData.vendorName}
            onChange={(e) => setFormData({ ...formData, vendorName: e.target.value })} />
        </div>
        <div>
          <label>Contact: </label>
          <input type="text" required value={formData.contact}
            onChange={(e) => setFormData({ ...formData, contact: e.target.value })} />
        </div>
        <div>
          <label>Email: </label>
          <input type="email" required value={formData.email}
            onChange={(e) => setFormData({ ...formData, email: e.target.value })} />
        </div>
        <button type="submit">Register as Vendor</button>
      </form>
    </div>
  );
}


---

14. API Endpoints

a. pages/api/register.ts

// pages/api/register.ts
import type { NextApiRequest, NextApiResponse } from "next";
import { addUser } from "../../lib/db";

export default async function handler(req: NextApiRequest, res: NextApiResponse) {
  if (req.method === "POST") {
    try {
      const { name, phone, nationalId, email, password } = req.body;
      if (!name || !phone || !nationalId || !email || !password) {
        return res.status(400).json({ message: "Missing required fields" });
      }
      const user = await addUser({ name, phone, nationalId, email, password });
      res.status(200).json({ message: `Registered ${user.name} successfully!` });
    } catch (error) {
      console.error("Registration error:", error);
      res.status(500).json({ message: "Server error during registration" });
    }
  } else {
    res.status(405).json({ message: "Method not allowed" });
  }
}

b. pages/api/loan.ts

// pages/api/loan.ts
import type { NextApiRequest, NextApiResponse } from "next";

export default function handler(req: NextApiRequest, res: NextApiResponse) {
  if (req.method === "POST") {
    const { amount } = req.body;
    // Insert business logic for loan processing here
    res.status(200).json({ message: `Loan application for Ksh ${amount} received!` });
  } else {
    res.status(405).json({ message: "Method not allowed" });
  }
}

c. pages/api/products.ts

// pages/api/products.ts
import type { NextApiRequest, NextApiResponse } from "next";

export default function handler(req: NextApiRequest, res: NextApiResponse) {
  if (req.method === "GET") {
    const products = [
      { id: "1", name: "Solar Panel", price: 15000, description: "High efficiency solar panel." },
      { id: "2", name: "Agricultural Drone", price: 50000, description: "Drone for crop monitoring." },
      { id: "3", name: "LED TV", price: 25000, description: "55-inch smart LED TV." }
    ];
    res.status(200).json({ products });
  } else {
    res.status(405).json({ message: "Method not allowed" });
  }
}

d. pages/api/vendor-register.ts

// pages/api/vendor-register.ts
import type { NextApiRequest, NextApiResponse } from "next";

export default function handler(req: NextApiRequest, res: NextApiResponse) {
  if (req.method === "POST") {
    const { vendorName, contact, email } = req.body;
    // Insert vendor registration logic here (e.g., save to database)
    res.status(200).json({ message: `Vendor ${vendorName} registered successfully!` });
  } else {
    res.status(405).json({ message: "Method not allowed" });
  }
}


---

15. lib/db.ts

A simulated database helper. In production, replace with real DB calls.

// lib/db.ts
type User = {
  name: string;
  phone: string;
  nationalId: string;
  email: string;
  password: string;
};

let users: User[] = [];

export async function addUser(user: User): Promise<User> {
  // In production, insert into a database
  users.push(user);
  return user;
}


---

PART II – MOBILE APP (Expo & React Native)

Project Structure

/pesaflow-app
├── screens
│   ├── HomeScreen.tsx
│   ├── RegisterScreen.tsx
│   ├── DashboardScreen.tsx
│   ├── LoanScreen.tsx
│   ├── MarketplaceScreen.tsx
│   ├── ProductScreen.tsx
│   ├── VendorRegistrationScreen.tsx
│   └── SolarLeasingScreen.tsx
├── App.tsx
├── package.json
└── tsconfig.json


---

1. package.json

{
  "name": "pesaflow-app",
  "version": "1.0.0",
  "main": "node_modules/expo/AppEntry.js",
  "scripts": {
    "start": "expo start",
    "android": "expo start --android",
    "ios": "expo start --ios"
  },
  "dependencies": {
    "expo": "~49.0.0",
    "expo-status-bar": "~1.6.0",
    "react": "18.2.0",
    "react-native": "0.72.0",
    "@react-navigation/native": "^6.1.6",
    "@react-navigation/native-stack": "^6.9.12",
    "axios": "^1.4.0"
  },
  "devDependencies": {
    "typescript": "^5.0.4",
    "@types/react": "^18.0.28",
    "@types/react-native": "^0.72.0"
  }
}


---

2. tsconfig.json

{
  "compilerOptions": {
    "target": "ESNext",
    "jsx": "react-native",
    "moduleResolution": "node",
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "strict": true
  }
}


---

3. App.tsx

Set up navigation between screens.

// App.tsx
import React from "react";
import { NavigationContainer } from "@react-navigation/native";
import { createNativeStackNavigator } from "@react-navigation/native-stack";
import HomeScreen from "./screens/HomeScreen";
import RegisterScreen from "./screens/RegisterScreen";
import DashboardScreen from "./screens/DashboardScreen";
import LoanScreen from "./screens/LoanScreen";
import MarketplaceScreen from "./screens/MarketplaceScreen";
import ProductScreen from "./screens/ProductScreen";
import VendorRegistrationScreen from "./screens/VendorRegistrationScreen";
import SolarLeasingScreen from "./screens/SolarLeasingScreen";

const Stack = createNativeStackNavigator();

export default function App() {
  return (
    <NavigationContainer>
      <Stack.Navigator initialRouteName="Home">
        <Stack.Screen name="Home" component={HomeScreen} />
        <Stack.Screen name="Register" component={RegisterScreen} />
        <Stack.Screen name="Dashboard" component={DashboardScreen} />
        <Stack.Screen name="Loan" component={LoanScreen} />
        <Stack.Screen name="Marketplace" component={MarketplaceScreen} />
        <Stack.Screen name="Product" component={ProductScreen} />
        <Stack.Screen name="VendorRegistration" component={VendorRegistrationScreen} />
        <Stack.Screen name="SolarLeasing" component={SolarLeasingScreen} />
      </Stack.Navigator>
    </NavigationContainer>
  );
}


---

4. screens/HomeScreen.tsx

// screens/HomeScreen.tsx
import React from "react";
import { View, Text, Button, StyleSheet } from "react-native";

export default function HomeScreen({ navigation }: any) {
  return (
    <View style={styles.container}>
      <Text style={styles.title}>Welcome to PesaFlow</Text>
      <Button title="Register" onPress={() => navigation.navigate("Register")} />
      <Button title="Dashboard" onPress={() => navigation.navigate("Dashboard")} />
      <Button title="Marketplace" onPress={() => navigation.navigate("Marketplace")} />
      <Button title="Solar Leasing" onPress={() => navigation.navigate("SolarLeasing")} />
    </View>
  );
}

const styles = StyleSheet.create({
  container: { flex: 1, alignItems: "center", justifyC