ticketfrei3/kibicara/platforms/email/webapi.py
2020-07-17 15:51:14 +02:00

139 lines
4.9 KiB
Python

# Copyright (C) 2020 by Maike <maike@systemli.org>
#
# SPDX-License-Identifier: 0BSD
from fastapi import APIRouter, Depends, HTTPException, status
from kibicara.platforms.email.bot import spawner
from kibicara.platforms.email.model import Email, EmailSubscribers
from kibicara.platformapi import Message
from kibicara.config import config
from kibicara.email import send_email
from kibicara.webapi.hoods import get_hood
from pydantic import BaseModel
from sqlite3 import IntegrityError
from nacl.encoding import URLSafeBase64Encoder
from nacl.secret import SecretBox
from os import urandom
class BodyMessage(BaseModel):
""" This model shows which values are supplied by the MDA listener script. """
text: str
author: str
secret: str
class Subscriber(BaseModel):
""" This model holds the email address of a fresh subscriber. """
email: str
router = APIRouter()
@router.post('/', status_code=status.HTTP_201_CREATED)
async def email_create(hood=Depends(get_hood)):
""" Create an Email bot. Call this when creating a hood.
:param hood: Hood.id of the hood the Email bot is supposed to belong to.
:return: Email row of the new email bot.
"""
try:
emailbot = await Email.objects.create(hood=hood, secret=urandom(32))
spawner.start(emailbot)
return emailbot
except IntegrityError:
raise HTTPException(status_code=status.HTTP_409_CONFLICT)
@router.delete('/', status_code=status.HTTP_200_OK)
async def email_delete(hood=Depends(get_hood)):
""" Delete an Email bot. Call this when deleting a hood.
Stops and deletes the Email bot as well as all subscribers.
:param hood: Hood the Email bot belongs to.
"""
email_bot = await Email.objects.get(hood=hood.id)
spawner.stop(email_bot)
await EmailSubscribers.objects.delete_many(hood=hood.id)
await email_bot.delete()
@router.post('/subscribe/')
async def email_subscribe(subscriber: Subscriber, hood=Depends(get_hood)):
""" Send a confirmation mail to subscribe to messages via email.
:param subscriber: Subscriber object, holds the email address.
:param hood: Hood the Email bot belongs to.
:return: Returns status code 200 after sending confirmation email.
"""
secretbox = SecretBox(Email.secret)
token = secretbox.encrypt(
{'email': subscriber.email,}, encoder=URLSafeBase64Encoder
)
asciitoken = token.decode('ascii')
confirm_link = (
config['root_url'] + "api/" + hood.id + "/email/subscribe/confirm/" + asciitoken
)
send_email(
subscriber.email,
"Subscribe to Kibicara " + hood.name,
sender=hood.name,
body="To confirm your subscription, follow this link: " + confirm_link,
)
return status.HTTP_200_OK
@router.post('/subscribe/confirm/{token}')
async def email_subscribe_confirm(token, hood=Depends(get_hood)):
""" Confirm a new subscriber and add them to the database.
:param token: encrypted JSON token, holds the email of the subscriber.
:param hood: Hood the Email bot belongs to.
:return: Returns status code 200 after adding the subscriber to the database.
"""
secretbox = SecretBox(Email.secret)
json = secretbox.decrypt(token.encode('ascii'), encoder=URLSafeBase64Encoder)
try:
await EmailSubscribers.objects.create(hood=hood.id, email=json['email'])
return status.HTTP_201_CREATED
except IntegrityError:
raise HTTPException(status_code=status.HTTP_409_CONFLICT)
@router.get('/unsubscribe/{token}', status_code=status.HTTP_200_OK)
async def email_unsubscribe(token, hood=Depends(get_hood)):
""" Remove a subscriber from the database when they click on an unsubscribe link.
:param token: encrypted JSON token, holds subscriber email + hood.id.
:param hood: Hood the Email bot belongs to.
"""
secretbox = SecretBox(Email.secret)
json = secretbox.decrypt(token.encode('ascii'), encoder=URLSafeBase64Encoder)
# If token.hood and url.hood are different, raise an error:
if hood.id is not json['hood']:
raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST)
await EmailSubscribers.objects.delete_many(hood=json['hood'], email=json['email'])
@router.post('/messages/')
async def email_message_create(message: BodyMessage, hood=Depends(get_hood)):
""" Receive a message from the MDA and pass it to the censor.
:param message: BodyMessage object, holds the message.
:param hood: Hood the Email bot belongs to.
:return: returns status code 201 if the message is accepted by the censor.
"""
# get bot via "To:" header
email_row = await Email.objects.get(hood=hood.id)
# check API secret
if message.secret is not email_row.secret:
raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED)
# pass message.text to bot.py
if await spawner.get(email_row).publish(Message(message.text)):
return status.HTTP_201_CREATED
else:
raise HTTPException(status_code=status.HTTP_451_UNAVAILABLE_FOR_LEGAL_REASONS)