Solidity Ethers.js – How to Specify Interacting, Owner, or Deployer Address?

Please don't be confuse on accessing function using web3js. According to your question..

created a modifier inside contract and applied to few functions May be you are using modifier as below (no hard and fast)

pragma solidity 0.4.22;

contract Token{

    address owneraddress;
    modifier onlyowner {
        require(owneraddress == msg.sender);
        _;
    }

    function Token(){
        owneraddress = msg.sender ;
    }

    function start() onlyowner {
      //your logic here  
    }

    function stop() onlyowner {
     //your logic here
    }
}

This restrict to other address except owner . Here owner is assigned as address by which the contract is deployed, Because here constructor is called once when contract is deployed. so you don't need to worry about any other can access this function except owner address.

Now the case is, If you give contract code and contract address to any one then also other account cannot access this function.

Any one can make there own Interface and access these function and again the result will be same. So this conclude that you do not need to restrict through web3js API.

If you want to specify in web3js part that you are the owner and only you want to access those own able function then there is no worth of giving your contract address and code to anyone, They will use there way so you don't have any control on it. If you are making Dapp and other user use your dapp then you can do in web3js layer. And this can be done as :-

web3.DeployedContractRef.start( { from: owneraddress});

web3.DeployedContractRef.stop( { from: owneraddress});

It might help you !

1. start ganache-cli with --acctKeys ganache-accounts.json parameter it will save all the data about accounts/keys

then use this script to extract public key :

#!/usr/bin/env python
import json
from pprint import pprint
import sys
file = sys.argv[1]
print file
json_data=open(file).read()
data = json.loads(json_data)
for a in data['addresses']:
    pubkeyArray=data['addresses'][a]['publicKey']['data']
    pubkey=""
    for pbk in pubkeyArray:
        pubkey = "%s%02x" % (pubkey,pbk)
    print "Address:%s" % a
    print "Public Key:0x%s" % pubkey 
    print "Private Key:0x%s" % data['private_keys'][a]

3. pass file name ganache-accounts.json to the script

4. it will produce output as follows :

./scripts/ganache-keys.py ./keystore/ganache-accounts.json 
./keystore/ganache-accounts.json
Address:0xb32613b32fd6f358259194c0a34e689e7eb9d88c
Public Key:0xf93e5a7cbd7b76cb3e2c1b362039397fbba00a0cbea1eccdf00e0e1e64d575411ae32bc6daf297aba31707fea7f84f20adb82c325fc33d347b54cf5fcd2bd71a
Private Key:0x30963a4383bfb78f0ecf290b1f3879a9c70903481e865f9e5d2df66ced64395d
Address:0x7c06350cb8640a113a618004a828d3411a4f32d3
Public Key:0xdcaa05bb5a82e0d1675d7f9b12b4d1948122500fc35ca7dee2edc99f2a3af2c5d6498f80dfbc0ab7c624793919aee8e4651adeefa7951c96438cad7838fbb9ea
Private Key:0x5641128d7d895f185d91fa2b83dffe646eede097d1a85c3247debc2b75219d92