Convert Shell2HTTP class to inherit from Flask.Blueprint

[eshaan7]

Currently, flask-shell2http works just like any other flask extension; you create an object from a class to which you pass the flask application instance. We could follow a different approach making it solely available as a pluggable Flask.Blueprint.

Some initial ideas:

• The Shell2HTTP class could derive from the Flask.Blueprint class; that way we can drop the init_app method, the register_command can be a wrapper over the Flask.Blueprint.add_url_rule method (it already is, but it works on app.add_url_rule). Then, the enduser would do something like,

from flask_shell2http import Shell2HTTP
# default blueprint instantiation
shell2http_bp = Shell2HTTP('awesome', __name__, url_prefix='/commands')
# extra method by flask-shell2http
shell2http_bp.register_command(endpoint="echo", command_name="echo", ...)

and then in the application factory,

app = Flask(__name__)
app.register_blueprint(shell2http_bp)

This would open doors for many other features since Flask.Flask and Flask.Blueprint derive from the same abstract base class and flask blueprints are very powerful.