File Hosting and URL Shortener via LINE Chatbot

• TL;DR
• How does it work?
• Technologies Used in This Project

TL;DR

Picture this: You’re in a university classroom, preparing for a presentation, and you need to access a PowerPoint file. The traditional process involves logging into Google Drive (entering your email, password, and 2FA), downloading the file, and finally opening it. What if I told you there’s a simpler way?

I’ve created a URL shortener that allows you to upload a file to a chatbot, and voila, you get a shortened URL.

How does it work?

1. Add friend with LINE chatbot
2. Send file into chat
3. LINE webhook trigger Golang backend API endpoint
4. Backend receieved webhook
   • Download file into variable []bytes
   • Upload to S3, Generate URL with unique access token https://firebasestorage.googleapis.com/v0/b/....jpeg?alt=media&token=9999999a-aaaa-aaaa-aaaa-9999999a
   • Generate shorten URL
   • Store shortenURL, filename under sender userId
   • Send message back to sender using reply token

1.Send a file or picture	2.Upload via UI

Technologies Used in This Project

1. Next.js - Deployed on Vercel https://liff.cjtim.com
2. LINE Frontend Framework - Allowed Login seemlessly inside LINE application Docs
3. Golang - GitHub Repository
4. MongoDB - Used for mapping LINE user IDs and storing URLs
5. Rebrandly - Provider for URL shortening
6. Google Cloud Storage (S3 bucket) - Used for storing images and videos provided by users
7. Cloudflare - Manages the domain server
8. Kubernetes - Deployment platform
9. GitLab CI - Containerize, Push to container registry, and deploy to k8s.