Accessing Redux Store from routes set up via React Router

The easiest way to accomplish this is to pass your store to a function that returns your routes (rather than return your routes directly). This way you can access the store in onEnter and other react router methods.

So for your routes:

import React from 'react';
import { Route, IndexRoute } from 'react-router';

export const getRoutes = (store) => (
  const authRequired = (nextState, replaceState) => {
    // Now you can access the store object here.
    const state = store.getState();

    if (!state.user.isAuthenticated) {
      // Not authenticated, redirect to login.
      replaceState({ nextPathname: nextState.location.pathname }, '/login');
    }
  };

  return (
    <Route   path="https://stackoverflow.com/"         component={App}>
      <IndexRoute             component={Landing} />
      <Route path="learn"     component={Learn} />
      <Route path="about"     component={About} />
      <Route path="downloads" component={Downloads} onEnter={authRequired} />
    </Route>
  );
)

Then update your main component to call the getRoutes function, passing in the store:

<Provider store={ store }>
  <Router history={ history }>
    { getRoutes(store) }
  </Router>
</Provider>

As for dispatching an action from requireAuth, you could write your function like this:

const authRequired = (nextState, replaceState, callback) => {
  store.dispatch(requireAuth())  // Assume this action returns a promise
    .then(() => {
      const state = store.getState();

      if (!state.user.isAuthenticated) {
        // Not authenticated, redirect to login.
        replaceState({ nextPathname: nextState.location.pathname }, '/login');
      }

      // All ok
      callback();
    });
};

Hope this helps.