* Add a timeout to prevent hanging when the KoboStore isn't reachable.
* Add back a the dummy auth implementation for when proxying is
disabled.
* Return the dummy auth response as a fallback when failing to contact
the KoboStore.
* Don't contact the KoboStore during the /sync API call when proxying is
disabled.
functionanility is lost by overriding the api_endpoint setting.
Requests are either:
* Redirected to the Kobo Store
* Proxied to the Kobo Store
* Proxied to the Kobo Store and merged with results from CalibreWeb.
Instead, the user generates the api_endpoint url to set on their device
by visiting http://.../kobo_auth/generate_auth_token.
The generated url will contain a RemoteAuthorizationToken that will be
included on all subsequent requests from the device to the kobo/
endpoints. (In contrast, the device is authenticated using a session cookie on
requests to the download endpoint).
Also use Flask.url_for to generate download urls.
Michael Shavit