code: function constructValidSigners (address, inner_path, data) {
    let valid_signers = []
    if (inner_path === 'content.json') {
      if (data.signers) valid_signers = Object.keys(data.signers)
    } else {
      // TODO: multi-user
    }
    if (valid_signers.indexOf(address) === -1) valid_signers.push(address) // Address is always a valid signer
    return valid_signers
  }
docs: Gets the valid signers for a file based on it's path and address
  Will be soon deperacted in favor of zeronet-auth
  @param {string} address - The address of the zie
  @param {string} inner_path - The path of the content.json file
  @param {object} data - The content.json contents as object
  @return {array} - Array of valid signers