To check if the unique object is the one being edited, we need to store
the object used to create the form in the form (_obj).
This is inspired from flask-admin.

Use inheritance to avoid duplication

cellspacing="0" : to avoid double lines in the header
width="100%" : to have extra fields (search, paging...) aligned properly with
the table

When registering a new host, only admin users shall be able to select
networks marked as "admin_only"

A gateway should be an interface like any other IP.
Use tag to identify it.

It shouldn't be possible to change the ICS id of an item.
But when registering a bunch of existing items via the API, we need to
allocate an ics_id otherwise not much can be done in the interface.
The id is required for the view and edit page.

The solution is to define some "temporary" ids that don't correspond to
any pre-printed labels.
Items with a temporary id can be assigned a real ics_id when assigning a
label.

Reserved ids start with 'ZZ' (from ZZA000 to ZZZ999)

ICS id can now be non nullable.

Allow to customize the default selected values:
- the default network prefix can be defined in the configuration (default to 24)
- the default first and last IP chosen can probably be improved
  it defaults to hosts[9] and hosts[-5] if the list has more than 15
  elements or the first and last otherwise

Note that when using a small prefix (< 19), the number of possilbe IPs is quite
large and updating the first and last IP select field takes some time...

Scroll up to ensure the from input is not hidden below the navbar.

See https://github.com/twbs/bootstrap/issues/1768

Rendering done client side using Showdown: http://showdownjs.com
Live preview is shown below the form.
Only raw text is saved in the database (no HTML).

Note that no XSS filtering is done!
See https://github.com/showdownjs/showdown/wiki/Markdown's-XSS-Vulnerability-(and-how-to-mitigate-it)

Markdown to HTML converter in Javascript

Use endpoint argument to avoid collision with flask-admin Network

If a selectfield is disabled, None is returned (not a string).
To pass wtforms validation, that value shall be part of the choices.

We use None as the value for SelectField that are optional (instead of
'').
We were previously converting '' to None when creating a model.
We now use the coerce function to let the form convert 'None' to None.

- disable item field for virtual hosts
- pre-fill interface name with hostname

Description shall be filled at the host level

See http://docs.sqlalchemy.org/en/latest/core/compiler.html#utc-timestamp-function

TODO: we should be able to render HTML in the comments
Look at https://github.com/miguelgrinberg/Flask-PageDown

- Main blueprint used to declare custom views for all blueprints.
(keep inventory blueprint cleaner)
- Add url_prefix to each blueprint

See http://getbootstrap.com/docs/4.0/components/input-group/#button-addons

Those tokens are supposed to be used in scripts or applications to
access the API and should not expire.

Updated to flask-jwt-extended 3.4.0 to be able to disable expiration
See https://github.com/vimalloc/flask-jwt-extended/issues/105

Store some settings to the session to make it easy to register
several identical items.

In Flask, session data are stored in a cookie by default.
Using a server side session, there is no risk of putting too much data
in the session and transmissting a big cookie on every request
(only an id is sent in the cookie).

Redis is used as backend (without persistent storage).

main blueprint splitted in:
- inventory
- networks

- Rename Host to Interface
- Create new Host table to group interfaces

Use the session instead of URL parameters to store the last network
chosen.

There is no point displaying the LDAP groups in the profile

- All created tokens are stored in the database.
  To revoke a token, we just delete it from the database.
  Tokens not found in the database are thus considered unvalid / revoked.

- Add button to copy generated token to the clipboard

- Redesign profile page

See https://clipboardjs.com

Open source icon set with ready-to-use fonts for bootstrap
See https://useiconic.com/open/