forked from forks/microblog.pub
116 lines
3.8 KiB
Python
116 lines
3.8 KiB
Python
from bs4 import BeautifulSoup # type: ignore
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from fastapi import APIRouter
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from fastapi import Depends
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from fastapi import HTTPException
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from fastapi import Request
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from fastapi.responses import JSONResponse
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from loguru import logger
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from sqlalchemy import select
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from app import models
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from app.boxes import get_outbox_object_by_ap_id
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from app.database import AsyncSession
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from app.database import get_db_session
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from app.utils import microformats
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from app.utils.url import check_url
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from app.utils.url import is_url_valid
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router = APIRouter()
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def is_source_containing_target(source_html: str, target_url: str) -> bool:
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soup = BeautifulSoup(source_html, "html5lib")
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for link in soup.find_all("a"):
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h = link.get("href")
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if not is_url_valid(h):
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continue
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if h == target_url:
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return True
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return False
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@router.post("/webmentions")
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async def webmention_endpoint(
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request: Request,
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db_session: AsyncSession = Depends(get_db_session),
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) -> JSONResponse:
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form_data = await request.form()
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try:
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source = form_data["source"]
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target = form_data["target"]
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if source == target:
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raise ValueError("source URL is the same as target")
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check_url(source)
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check_url(target)
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except Exception:
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logger.exception("Invalid webmention request")
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raise HTTPException(status_code=400, detail="Invalid payload")
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logger.info(f"Received webmention {source=} {target=}")
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existing_webmention_in_db = (
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await db_session.execute(
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select(models.Webmention).where(
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models.Webmention.source == source,
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models.Webmention.target == target,
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)
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)
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).scalar_one_or_none()
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if existing_webmention_in_db:
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logger.info("Found existing Webmention, will try to update or delete")
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mentioned_object = await get_outbox_object_by_ap_id(db_session, target)
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if not mentioned_object:
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logger.info(f"Invalid target {target=}")
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if existing_webmention_in_db:
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logger.info("Deleting existing Webmention")
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existing_webmention_in_db.is_deleted = True
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await db_session.commit()
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raise HTTPException(status_code=400, detail="Invalid target")
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maybe_data_and_html = await microformats.fetch_and_parse(source)
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if not maybe_data_and_html:
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logger.info("failed to fetch source")
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if existing_webmention_in_db:
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logger.info("Deleting existing Webmention")
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mentioned_object.webmentions_count = mentioned_object.webmentions_count - 1
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existing_webmention_in_db.is_deleted = True
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await db_session.commit()
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raise HTTPException(status_code=400, detail="failed to fetch source")
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data, html = maybe_data_and_html
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if not is_source_containing_target(html, target):
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logger.warning("target not found in source")
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if existing_webmention_in_db:
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logger.info("Deleting existing Webmention")
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mentioned_object.webmentions_count = mentioned_object.webmentions_count - 1
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existing_webmention_in_db.is_deleted = True
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await db_session.commit()
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raise HTTPException(status_code=400, detail="target not found in source")
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if existing_webmention_in_db:
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existing_webmention_in_db.is_deleted = False
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existing_webmention_in_db.source_microformats = data
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else:
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new_webmention = models.Webmention(
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source=source,
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target=target,
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source_microformats=data,
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outbox_object_id=mentioned_object.id,
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)
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db_session.add(new_webmention)
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mentioned_object.webmentions_count = mentioned_object.webmentions_count + 1
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await db_session.commit()
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return JSONResponse(content={}, status_code=200)
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