📝 Save Notes to Google Docs with Images

This project is a simple Go-based server that lets you save rich notes — including text, tags, and images — directly to a Google Docs document using the Google Drive and Docs APIs.

It’s designed to demonstrate OAuth 2.0 integration, working with multipart form uploads, and structured note-saving into a single shared document.

Features

• Google OAuth 2.0 Authentication
• Upload images to Google Drive
• Save notes (title, tags, text, and images) to a single Google Docs file
• Insert each new note at the top of the document
• Two REST API endpoints:
  • POST /note: Add a new note with optional images
  • GET /notes: Retrieve all notes in structured JSON format
• Lightweight: No external deployment required — runs locally

How It Works

1. Authentication: Uses OAuth 2.0 to authenticate and authorize access to Google Docs & Drive APIs.
2. Image Upload: Uploaded images are saved to Google Drive, and their URLs are retrieved.
3. Note Formatting: A note containing the title, tags, timestamp, and content (with inline images) is created.
4. Google Docs Update: The formatted note is inserted at the beginning of a predefined Google Doc (ID is set via an environment variable).

Environment Variables

Set the following environment variable before running the app:

GOOGLE_DOCS_ID=your_google_docs_id_here

Running Locally

1. Clone the repo
2. Set up your Google Cloud project (enable Drive & Docs APIs)
3. Authenticate with Google (locally). In this project, you can use gcloud auth application-default login to set up Application Default Credentials.
4. Set GOOGLE_DOCS_ID in your environment
5. Run the server:

go run main.go

Example Note at Google Docs

Travel Plans in 2025

Create Date: 2:08:38 PM, 5/20/2025

Day 1: Start at Buckingham Palace, stroll St. James’s Park, and visit Westminster Abbey. See Big Ben and the Houses of Parliament, then head to the South Bank for lunch and a ride on the London Eye. Walk along the Thames to Tower Bridge, passing the Globe and Tate Modern. End with a sunset Thames cruise and riverside dinner.

Day 2: Visit the British Museum, then explore the Tower of London and Tower Bridge. Enjoy dinner and a show in the West End.

Day 3: Wander Notting Hill, relax in Hyde Park, visit Kensington museums, shop at Harrods, and dine in South Kensington.

API Overview

POST /note

Add a new note with optional tags and images.

Request (multipart/form-data)

• title: string
• note: string (main text content)
• tags: string
• images[]: file(s)

GET /notes

Retrieve all notes in structured format.

Response

{
  "success": true,
  "message": "2 note(s) found.",
  "data": [
    {
      "title": "New Note Without Image",
      "note": "- Complete your Go Project",
      "tags": "go,coding",
      "date": "06:27:40 PM, 2025-05-24"
    },
    {
      "title": "New Homework",
      "note": "- Read Unit 1 Words.\n- Do exercise 1.2 at the Lecture Book.\n",
      "tags": "homework,dutch,study",
      "date": "01:30:09 AM, 2025-05-23"
    }
  ]
}

Tech Stack

• Language: Go
• API: net/http, mime/multipart, and Google SDKs
• Services Used:
  • Google Drive API (image upload)
  • Google Docs API (note saving)