Dropbox

Functional req

1.user should be able to upload file from device

2.user should be able to download file

3.user should be able to share a file and view shared files with them

4.user should be able to sync all files across devices

Non functional req

1.availity > consistency

2.low latency

3.support file size upto 50 gb

4.system should be secure and reliable. We should be able to recover files if lost or corrupted

Core entities

User - a person using this dropbox

File meta data - metadata of the file , store information like file name , desc

File - raw file that user will be uploading/downloading

API Design

-uploading a file :

POST /files

Request :

{
File,
fileMetadata
}

-download a file:

GET /files/{fileId} -> File & FileMetaData

-share files

POST  /files/{fileId}/share -

Request :

{
User[]
}

• Sync to the local device

GET /files/changes?since={timeStamp}  -> ChangeEvent[]

And for all these user information will be shared through JWT json web token
(good as users will be authenticated and authorized to perform actions while preserving security )

https://claude.ai/public/artifacts/59aa1935-bb28-4be7-a12e-f4acb1da89ec