Solidity noob but have looked around and cannot seem to find an answer to my specific issue. I am sure I am overlooking something really obvious but need help.
I am working in Remix using the Injected Web3 environment. I have successfully deployed a test contract from the injected wallet (using https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol) and I can see the 1 trillion tokens in that wallet. So far so good.
I have a second contract and am just trying to set up some functions so I can:
- Approve an allowance for the contract to spend this token on my behalf
- Send the token on my behalf (to itself, in this case)
The code I have is:
// grant allowance to contract to spend 'amount' on behalf of caller
function approveToken(uint amount) public payable {
token.increaseAllowance(address(this), amount);
}
// send 'amount' from caller to contract
function sendToken(uint amount) public payable {
token.transferFrom(msg.sender, address(this), amount);
}
// return balance of 'token' owned by caller
function getTokenBalance() public view returns(uint256) {
return token.balanceOf(msg.sender);
}
// return 'token' allowance contract can spend on behalf of caller
function getTokenAllowance() public view returns(uint256) {
return token.allowance(msg.sender, address(this));
}
approveToken executes without any error
getTokenBalance works fine (shows the tokens)
getTokenAllowance returns 0
What I think is happening is when I run the sendToken function from remix my wallet is the caller, not the contract. So I am essentially checking whether I have given myself an allowance to send this token, and perhaps that is what is tripping things up. So it seems to me I need to make sure the contract is what is calling the sendToken function as that is the 3rd party given an allowance.
But I am lost, any help would be appreciated.
