Smart Email Writer Backend

This repository contains the Java-based Spring Boot backend for the Smart Email Writer application. It acts as a bridge between the user interface (Chrome Extension/Web App) and the Google Gemini AI, providing an API to generate context-aware email replies.

🛠️ Technical Overview

The backend is built using the following stack:

• Framework: Spring Boot 3.2.1
• Language: Java 17
• AI Integration: Google Gemini API (via Spring WebClient)
• Networking: Reactive WebClient for asynchronous API calls

🏗️ Core Architecture

1. Model (EmailRequest.java)

Defines the structure of incoming data from the frontend.

• emailContent: The original email body to be replied to.
• tone: The desired style for the response (e.g., Professional, Casual).

2. Service (EmailGeneratorService.java)

The core logic layer that communicates with Google's Generative Language API.

• Prompt Engineering: It constructs a specialized prompt instructing the AI to generate a reply based on the provided email content and tone.
• Response Parsing: It uses ObjectMapper to traverse the complex JSON response from Gemini and extract only the generated text.
• API Configuration: Dynamically fetches the API Key and URL from environment properties.

3. Controller (EmailGeneratorController.java)

Exposes the REST endpoint for generation.

• Endpoint: POST /api/email/generate.
• CORS: Configured with @CrossOrigin to allow requests from the Chrome Extension and local development environments.

📋 API Specification

Generate Email Reply

Endpoint: POST http://localhost:8080/api/email/generate

Request Body:

{
    "emailContent": "Hi, are we still meeting today at 3 PM?",
    "tone": "professional"
}

Response:

"Subject: Re: Meeting Confirmation

Dear [Name],
Yes, we are still scheduled to meet today at 3 PM. I look forward to our discussion.
Best regards, [Your Name]"

🚀 Getting Started

Prerequisites

• JDK 17 or higher.
• Maven installed.
• A valid Google Gemini API Key.

Configuration

1. Navigate to src/main/resources/application.properties.
2. Set your API key:

gemini.api.key=YOUR_ACTUAL_API_KEY
gemini.api.url=https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent

Running the Application

1. Clone the repository.
2. Run the following command in the terminal:

mvn spring-boot:run

🖼️ Working Images

1. Backend Startup

//To Do

2. Request Processing

//To Do

3. Successful Generation

//To Do