onflow / cadence-libraries

Libraries for common programming utilities in the Cadence smart contract programming language

The Unlicense

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Create Restricted Token Spending Smart Contracts #3

Closed joshuahannan closed 2 years ago

joshuahannan commented 2 years ago

Description

Need a smart contract that implements a way to restrict tokens in an account to only be able to be spent in certain apps, up to a limit.

Description of Done

User Resource

Use generic fungible token whenever possible
Resource that stores a private FungibleToken.Vault
public deposit function in a public interface and capability
Withdraw is restricted to access(account)
Tokens are stored based on which project they have been allocated for and each project has a limit per user and an expiration date

Project Resource

Each project has a specific ID
Tracks how many restricted tokens have been withdrawn by the project
Once the specified limit has been reached, no longer allow it to withdraw from users' restricted resources
Withdraw functions will have to wrap project specific operations.
TBD on if the above will able to be generalized without each project needing to do an explicit upgrade to their contracts to support this.

Admin Resource

Can create new project resources
Can add new project IDs and limits to the record

Surrounding Work Required

Updating this Repo to use flow.json + overflow
Documentation in the README
Guides/Tutorials
Tests for all use cases and stake holders

joshuahannan commented 2 years ago

Closing in favor of the other solution