Snapfile - COM3014 CW2

Download/Upload/Delete

How to build

1. Clone this project
2. Install according to the dependencies inside package.json
3. Open terminal under the folder, type "npm start" to start the server
4. Browse http://localhost:4000/

Todo List

• Integrating with URL-service

Changes from last push

• Updated README.md

Current MongoDB Schema

See model.js

Routes that work

GET method:

Get	Result	Note
/returnurl/:id	return a hash	For EJS testing frontend
/download/:hash	Download file from S3	N/A

POST method: Upload + Delete

Post	Result	Note
/dud/returnurl	Return a hash for downloading link back to URL-service	Please refer to Format-1
/dud/upload	Upload file to S3 and leave record in MongoDB	After uploading, POST requests will be sent automatically to other backend services using the format-2
/dud/delete	Delete file inside S3 & MongoDB (Hard delete)	Receiving JSON of format-3 to trigger delete. POST method is used instead of DELETE method for the ease of using Kubernetes

Format-1 of JSON:

Receiving:

{ type: 'RequestHash',
  data:
   {
     fileId: '607ccfafagagag12'
   }
}

Sending out:

{ type: 'HashSent',
  data:
   {
     hash: '607ccf61c850253e54923112', //randomHash in MongoDB
   }
}

Format-2 of JSON file:

Sending out:

{ type: 'FileUploaded',
  data:
   { fileId: '607ccf61c850253e54923112', //_id in MongoDB
     userId: 'd41d8cd98f00b204e9800998ecf8427e', //random generated example userId
     fileName: 'cat2.jpg', //user-defined original file name
     uploadedDate: 'Mon Apr 19 2021 01:31:29 GMT+0100 (British Summer Time)' //generated from Date(Date.now())
   }
}

Format-3 of JSON file:

Receiving:

{ type: 'FileDeleted',
  data:
   {
     fileId: '607ccf61c850253e54923112', //_id in MongoDB
   }
}

Frontend:

• Port 4000: Download/upload service
• Port 4001: User service
• Port 4002: Meta service

Gate	Method	Note
4000/upload	POST	Upload file to S3, Port4000 DB, Port4001 DB and Port4002 DB
4001/user/:fileId	DELETE	Delete file in Port4000 DB, Port4001 DB and S3 (fileId = fileId inside Port4001 DB)
4001/user/:userId	GET	Get files for specific user in Port4001 DB

File download link: http://localhost:4002/meta/get/:id (where id = id inside Port4002 DB)