Inject an Authorization header into a redux-api-middleware request with a Redux middleware.

apiAuthInjector.js

import { CALL_API } from 'redux-api-middleware'

export default function({ getState }) {
  return function(next) {
    return function(action) {
      const callApi = action[CALL_API]

      if (callApi) {
        const { authToken } = getState()

        callApi.headers = Object.assign({}, callApi.headers, {
          Authorization: authToken,
        })
      }

      return next(action)
    }
  }
}