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# UGE / L2 / Intro to relational databases / Python project prototype
# Author: Pacien TRAN-GIRARD
# Licence: EUPL-1.2
from typing import Optional, NamedTuple
from decimal import Decimal
from fastapi import Depends, Request
from fastapi.templating import Jinja2Templates
from app_sessions import UserSession, FlashMessageQueue
from app_database import db_transaction
# Load and parse Jinja HTML templates pages and fragments.
bare_templates = Jinja2Templates(directory='./templates/')
class TemplateRenderer:
"""
Template renderer using dependency injection to populate the template
parameters used by all pages.
"""
def __init__(
self,
request: Request,
messages: FlashMessageQueue=Depends(FlashMessageQueue),
session: UserSession=Depends(UserSession),
):
self._request = request
self._messages = messages
self._session = session
def _get_user(self) -> Optional[NamedTuple]:
if not self._session.is_logged_in():
return None
with db_transaction() as tx:
return tx.fetch_account(user_id=self._session.get_user_id())
def _shared_template_args(self) -> dict:
return {
'request': self._request,
'messages': self._messages,
'user': self._get_user(),
}
def __call__(self, template: str, **kwargs):
template_args = self._shared_template_args() | kwargs
return bare_templates.TemplateResponse(template, template_args)
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