Fuse staking public good for UBI and profit

[sirpy]

GoodDollar is a non-profit project, delivering digital basic income to tens of thousands of daily users in the form of the G$ token.

Currently the FuseStaking contract donates all earned rewards from staked Fuse. It uses the rewards to buyback G$s on Fuseswap and splits those G$s between the UBI Pool and a Community Pool

This bounty is about upgrading the FuseStaking contract with a feature that allows users to stake with G$ and also earn rewards pro-rata
There's another bounty here to Add this functionality to the wallet

Join https://t.me/GoodDollarBounties to learn more

Motivation

• We want to give G$ more utility
• Educate our citizens about savings, investment and DEFI

Details

• The current FustStaking (here:``) distributes the earnings to the UBI pool and a Community pool according to pre-defined ratio.
  • add another ratio that will set how much out of the earnings will be allocated to reward the stakers
  • use BaseShare.sol to add Staking token capabilities and pro-rata rewards
  • add a method to set the different ratios. require that they add up to 100%
• Implement the Stakers pool functionality
  • every day when collecting rewards update the amount that is kept for stakers
  • when user stakes he should be able to specify if he wants to donate his rewards or not (0 or 100) (user forfeits his G$ rewards and they will go to the UBI/community pool according to their respective ratios
• Update stake method
  • no msg.value try to collect G$s using transferFrom
  • swap G$s to Fuse on fuseswap
  • update user stakes/productivity in Fuse tokens. (Also keep a total of the original G$ amounts he staked)
  • staking distributes pending rewards
• Update withdraw method
  • allow user to specify how much to withdraw
  • withdrawing distributes pending rewards
  • update user stakes/productivity
• Protect against manipulation. Currently we dont convert Fuse to G$ if price impact is more than X%. this might not be enough if price is manipulated just before. (ie deposting lots of G$ but little Fuse).
• use price impact over uniswap TWAP or suggest a different protection method

[bertux]

I like this contracts part so I will look into by practicing locally.