msg.sender problem for calling ERC20 token contract from another contract returns contract address

Question

when i am going to call approve function of erc20 contract.log prints tokenOwner and tokenSpender address same which is contract address msg.sender returns contract address. but i want tokenWner = caller address and tokenSpender = contract address please help.

THis is erc20 method

 function approve(address spender, uint256 tokens) public returns (bool success) {
    allowed[msg.sender][spender] = tokens;
   emit Approval(msg.sender, spender, tokens);

    return true;
}

And this is my contract method that is calling token method

 function approve(address token, uint256 _value) public returns (bool) {
 return ERC20Interface(token).approve(this, _value);
}

Answer 1

The users who is spending tokens is the one to approve the contract.

The contract cannot appoint itself to spend tokens from someone else's wallet.

Hope it helps.