Backup to Dropbox, Linux script

What is supposed to do:

• Demo and test OAuth2 protocol
• Use "implicit grant" method

Allow to make files backups in your Dropbox in the application folder.

1. code grant (server side / web apps) / both key & secret / 2 stages (more secure) (can be guaranteed that the user will not view the source code to get the key & the secret) The rationale is to never expose secret to the user, thus they can't pretend to be the same app.

   1. step one - just to authenticate
   2. step two - to exchange the authorization code to token

2. implicit grant - token (client side, mobile / JS) / app key only / 1 stage User can view the source code (JS), no reaseon to distinguish between public key & secret

Token is like a key to access the files (bearer token).

In this project, it makes sense to use Option 2.

• https://www.dropbox.com/developers/reference/oauth-guide
• https://blogs.dropbox.com/developers/2013/07/using-oauth-2-0-with-the-core-api/
• https://www.dropboxforum.com/t5/API-Support-Feedback/API-secret-in-dropbox-oauth-DropboxOAuth2FlowNoRedirect-and/td-p/276987
• https://www.quora.com/Why-does-OAuth-server-return-a-authorization-code-instead-of-access-token-in-the-first-step
• https://www.digitalocean.com/community/tutorials/an-introduction-to-oauth-2
• https://www.dropbox.com/developers/reference/oauth-guide