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Caller -> Contract B -> Contract A

Contract A has a msg.sender variable.

I want to use the Caller as Msg.Sender for Contract A through Contract B.

How is this done?

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  • The question is unclear. Please consider adding the relevant part of your code.
    – goodvibration
    Jul 28, 2019 at 8:00
  • _allowed[msg.sender][spender] that's what I have under the main contract. I want to be able to have msg.sender be passed as the calling contract.
    – Fifth Dimension Dragon
    Jul 28, 2019 at 15:27

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There are only two common variables for finding out senders. There´s msg.sender which gives address of the one who sent/relayed the current transaction call - so the previous contract or EOA (Externally Owned Account) in the chain of contract calls. Then there´s tx.origin which is the original issuers of the transaction - always an EOA, never a contract as a contract can't issue a new transaction. Typically tx.origin is very seldom needed and shouldn't be used. In your case tx.origin gives what you want but I suggest to rethink your design so you wouldn't need that.

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  • I am unable to change the already uploaded contract's msg.sender variable. I can only write the calling contract differently.
    – Fifth Dimension Dragon
    Jul 28, 2019 at 15:28
  • You can't change the value of msg.sender explicitly - that comes from the environment.
    – Lauri Peltonen
    Jul 28, 2019 at 15:58

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