servii-backend/app.py

import http
import inspect

from flask import Flask, Response, jsonify, request
from flask_cors import CORS

import firebase_manager
import generic_executor

app = Flask(__name__)
CORS(app)
cors = CORS(app, origins=['*'])


def generic_response_maker(status_code: http.HTTPStatus, _message: str = None) -> tuple[Response, int]:
    if _message is not None:
        return jsonify({'message': _message}), status_code.value
    match status_code:
        case http.HTTPStatus.CREATED:
            message = jsonify({'message': 'Creation successful.'})
        case http.HTTPStatus.INTERNAL_SERVER_ERROR:
            message = jsonify({'message': 'Internal Server Error.'})
        case http.HTTPStatus.NO_CONTENT:
            message = jsonify({'message': 'Deletion successful'})
        case http.HTTPStatus.ACCEPTED:
            message = jsonify({'message': 'Action successful.'})
        case http.HTTPStatus.BAD_REQUEST:
            message = jsonify({'message': 'Bad Request, the property you tried to modify is not valid.'})
        case http.HTTPStatus.NOT_FOUND:
            message = jsonify({'message': 'Server not found.'})
        case http.HTTPStatus.UNSUPPORTED_MEDIA_TYPE:
            message = jsonify({'message': 'Unsupported Media Type / No JSON payload'})
        case http.HTTPStatus.OK:
            message = jsonify({'message': 'Success.'})
        case http.HTTPStatus.METHOD_NOT_ALLOWED:
            message = jsonify({'message': 'This API call does not exist.'})
        case _:
            message = jsonify({'message': 'Could not process request.'})
    return message, status_code.value


def authenticate_request(data: dict):
    if 'token' not in data:
        raise Exception("Missing 'token' in request body. The API doesn't support anonymous access anymore.")
    else:
        #valid, user_id = firebase_manager.verify_jwt_token(data['token']) //TODO : REMOVE THIS when the front is ready
        valid, user_id = True, data['token']
        if not valid:
            raise Exception("Invalid JWT token.")
        else:
            user = firebase_manager.get_user_from_id(user_id)
            if not user:
                raise Exception("User not found.")
            if not user.email_verified:
                raise Exception("Your google account isn't verified yet.")
    return user


def parse_and_validate_request(parameters: [str]) -> list[str] or None:
    args = []
    data = request.get_json()
    if not data:
        raise Exception("Empty request body.")
    user = authenticate_request(data)
    data['user'] = user
    for name in parameters:
        if name not in data:
            raise Exception(f"Missing parameter {name}")
        value = data[name]
        args.append(value)
    return args


route_handlers = {
    'SetSubdomain': generic_executor.set_subdomain,
    'FetchServers': generic_executor.fetch_servers,
    'AccountCreate': generic_executor.account_create,
    'ServerCreate': generic_executor.server_create,
    'ServerDelete': generic_executor.server_delete,
    'AccountDelete': generic_executor.account_delete,
    'ServerRun': generic_executor.server_run,
    'ServerStop': generic_executor.server_stop,
    'UpdateProperty': generic_executor.update_property,
    'Command': generic_executor.run_command,
}


@app.route('/<path:path>', methods=['POST'])
def dynamic_route_handler(path):
    if path not in route_handlers:
        return generic_response_maker(http.HTTPStatus.METHOD_NOT_ALLOWED)

    route_fn = route_handlers[path]
    parameters = []
    sig = inspect.signature(route_fn)
    for param in sig.parameters.values():
        parameters.append(param.name)
    try :
        mapped_parameters = parse_and_validate_request(parameters)
        if mapped_parameters is None:
            return generic_response_maker(http.HTTPStatus.BAD_REQUEST)
        status, message = route_fn(*mapped_parameters)
        if isinstance(message, list):
            return jsonify(message), http.HTTPStatus.OK
        return generic_response_maker(status, message if message else None)
    except Exception as e:
        return generic_response_maker(http.HTTPStatus.BAD_REQUEST, str(e))


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=3000, debug=True)