whose permission is required while sending transaction and how can we give that permission

Question

I have two accounts viz. account1 and account2. I set my contract using account2. Now, I am sending 0.1100 EOS from account2 to account1 as a deferred transaction. I am using the following function which invokes a function transfer.

      void second::send(account_name from , account_name to ,asset  quantity,string  memo,uint64_t delay) {
            eosio::transaction t{};

            t.actions.emplace_back(
                eosio::permission_level(from, N(active)),
                account1,
                N(transfer),
                std::make_tuple(from,to,quantity,memo)
            );
            t.delay_sec = delay;
            t.send(N(memo), from);
        }

I am passing from ,to,quantity and memo to the action send. If I hard code the value of account1, it works and if I set it to some other account it gives the permission exception.
So, now I am confused how to set the correct permissions. Thanks

Answer 1

I'm not quite sure in your code what's account1 as it's not defined anywhere. Did you mean N(account1)? Also, what does account1::transfer() look like? Are you trying to transfer EOS tokens? You should probably be using eosio.token as the account to which you send the action then.

Here's an example of a contract that manages the transfer of tokens

#include <string>
#include <eosiolib/eosio.hpp>
#include <eosiolib/asset.hpp>

using std::string;
using std::make_tuple;
using eosio::action;
using eosio::contract;
using eosio::permission_level;
using eosio::asset;

class passtokens : public contract {
  public:
      passtokens (account_name account) : contract(account) {}

      void sendtokens(account_name from, account_name to, asset amount, string memo) { 
          action(
            permission_level{from, N(active)},
            N(eosio.token),
            N(transfer),
            make_tuple(from, to, amount, memo)
          ).send();
      }
};

EOSIO_ABI( passtokens, (sendtokens) )

Give permission to the account that uploaded the contract above to use your active authority under their eosio.code authority:

$ cleos set account permission <your-account> active '{"threshold": 1,"keys": [{"key": "<your-key>","weight": 1}],"accounts": [{"permission":{"actor":"passtokens","permission":"eosio.code"},"weight":1}]}' owner -p <your-account>

then send a transaction:

$ cleos push action passtokens sendtokens '["<your-account>", "<account-you-want-to-send-tokens-to>", "50.0000 EOS", "memo message"]' -p <your-account>