mirror of
https://git.sr.ht/~tsileo/microblog.pub
synced 2025-06-05 21:59:23 +02:00
375 lines
8.1 KiB
Python
375 lines
8.1 KiB
Python
import base64
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from datetime import datetime
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from datetime import timezone
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from functools import lru_cache
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from typing import Any
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from typing import Callable
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from urllib.parse import urlparse
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import bleach
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import emoji
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import html2text
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import humanize
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from bs4 import BeautifulSoup # type: ignore
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from fastapi import Request
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from fastapi.templating import Jinja2Templates
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from loguru import logger
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from sqlalchemy import func
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from sqlalchemy import select
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from starlette.templating import _TemplateResponse as TemplateResponse
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from app import activitypub as ap
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from app import config
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from app import models
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from app.actor import LOCAL_ACTOR
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from app.ap_object import Attachment
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from app.ap_object import Object
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from app.config import BASE_URL
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from app.config import DEBUG
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from app.config import VERSION
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from app.config import generate_csrf_token
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from app.config import session_serializer
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from app.database import AsyncSession
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from app.media import proxied_media_url
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from app.utils.datetime import now
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from app.utils.highlight import HIGHLIGHT_CSS
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from app.utils.highlight import highlight
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_templates = Jinja2Templates(directory="app/templates")
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H2T = html2text.HTML2Text()
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H2T.ignore_links = True
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H2T.ignore_images = True
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def _filter_domain(text: str) -> str:
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hostname = urlparse(text).hostname
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if not hostname:
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raise ValueError(f"No hostname for {text}")
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return hostname
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def _media_proxy_url(url: str | None) -> str:
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if not url:
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return "/static/nopic.png"
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if url.startswith(BASE_URL):
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return url
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encoded_url = base64.urlsafe_b64encode(url.encode()).decode()
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return f"/proxy/media/{encoded_url}"
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def is_current_user_admin(request: Request) -> bool:
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is_admin = False
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session_cookie = request.cookies.get("session")
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if session_cookie:
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try:
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loaded_session = session_serializer.loads(
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session_cookie,
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max_age=3600 * 12,
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)
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except Exception:
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pass
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else:
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is_admin = loaded_session.get("is_logged_in")
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return is_admin
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async def render_template(
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db_session: AsyncSession,
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request: Request,
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template: str,
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template_args: dict[str, Any] = {},
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) -> TemplateResponse:
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is_admin = False
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is_admin = is_current_user_admin(request)
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return _templates.TemplateResponse(
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template,
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{
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"request": request,
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"debug": DEBUG,
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"microblogpub_version": VERSION,
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"is_admin": is_admin,
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"csrf_token": generate_csrf_token() if is_admin else None,
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"highlight_css": HIGHLIGHT_CSS,
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"visibility_enum": ap.VisibilityEnum,
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"notifications_count": await db_session.scalar(
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select(func.count(models.Notification.id)).where(
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models.Notification.is_new.is_(True)
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)
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)
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if is_admin
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else 0,
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"local_actor": LOCAL_ACTOR,
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"followers_count": await db_session.scalar(
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select(func.count(models.Follower.id))
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),
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"following_count": await db_session.scalar(
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select(func.count(models.Following.id))
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),
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"actor_types": ap.ACTOR_TYPES,
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**template_args,
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},
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)
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# HTML/templates helper
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ALLOWED_TAGS = [
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"a",
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"abbr",
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"acronym",
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"b",
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"br",
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"blockquote",
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"code",
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"pre",
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"em",
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"i",
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"li",
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"ol",
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"strong",
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"sup",
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"sub",
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"del",
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"ul",
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"span",
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"div",
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"p",
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"h1",
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"h2",
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"h3",
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"h4",
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"h5",
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"h6",
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"table",
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"th",
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"tr",
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"td",
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"thead",
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"tbody",
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"tfoot",
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"colgroup",
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"caption",
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"img",
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"div",
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"span",
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]
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ALLOWED_CSS_CLASSES = [
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"highlight",
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"codehilite",
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"hll",
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"c",
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"err",
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"g",
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"k",
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"l",
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"n",
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"o",
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"x",
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"p",
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"ch",
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"cm",
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"cp",
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"cpf",
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"c1",
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"cs",
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"gd",
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"ge",
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"gr",
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"gh",
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"gi",
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"go",
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"gp",
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"gs",
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"gu",
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"gt",
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"kc",
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"kd",
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"kn",
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"kp",
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"kr",
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"kt",
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"ld",
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"m",
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"s",
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"na",
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"nb",
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"nc",
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"no",
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"nd",
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"ni",
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"ne",
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"nf",
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"nl",
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"nn",
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"nx",
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"py",
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"nt",
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"nv",
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"ow",
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"w",
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"mb",
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"mf",
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"mh",
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"mi",
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"mo",
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"sa",
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"sb",
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"sc",
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"dl",
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"sd",
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"s2",
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"se",
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"sh",
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"si",
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"sx",
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"sr",
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"s1",
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"ss",
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"bp",
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"fm",
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"vc",
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"vg",
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"vi",
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"vm",
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"il",
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]
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def _allow_class(_tag: str, name: str, value: str) -> bool:
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return name == "class" and value in ALLOWED_CSS_CLASSES
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def _allow_img_attrs(_tag: str, name: str, value: str) -> bool:
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if name in ["src", "alt", "title"]:
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return True
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if name == "class" and value == "inline-img":
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return True
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return False
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ALLOWED_ATTRIBUTES: dict[str, list[str] | Callable[[str, str, str], bool]] = {
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"a": ["href", "title"],
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"abbr": ["title"],
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"acronym": ["title"],
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"img": _allow_img_attrs,
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"div": _allow_class,
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"span": _allow_class,
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"code": _allow_class,
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}
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@lru_cache(maxsize=256)
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def _update_inline_imgs(content):
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soup = BeautifulSoup(content, "html5lib")
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imgs = soup.find_all("img")
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if not imgs:
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return content
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for img in imgs:
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if not img.attrs.get("src"):
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continue
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img.attrs["src"] = _media_proxy_url(img.attrs["src"]) + "/740"
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img["class"] = "inline-img"
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return soup.find("body").decode_contents()
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def _clean_html(html: str, note: Object) -> str:
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if html is None:
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logger.error(f"{html=} for {note.ap_id}/{note.ap_object}")
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return ""
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try:
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return _emojify(
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_replace_custom_emojis(
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bleach.clean(
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_update_inline_imgs(highlight(html)),
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tags=ALLOWED_TAGS,
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attributes=ALLOWED_ATTRIBUTES,
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strip=True,
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),
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note,
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),
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is_local=note.ap_id.startswith(BASE_URL),
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)
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except Exception:
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raise
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def _timeago(original_dt: datetime) -> str:
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dt = original_dt
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if dt.tzinfo:
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dt = dt.astimezone(timezone.utc).replace(tzinfo=None)
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return humanize.naturaltime(dt, when=now().replace(tzinfo=None))
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def _has_media_type(attachment: Attachment, media_type_prefix: str) -> bool:
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return attachment.media_type.startswith(media_type_prefix)
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def _format_date(dt: datetime) -> str:
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return dt.strftime("%b %d, %Y, %H:%M")
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def _pluralize(count: int, singular: str = "", plural: str = "s") -> str:
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if count > 1:
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return plural
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else:
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return singular
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def _replace_custom_emojis(content: str, note: Object) -> str:
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idx = {}
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for tag in note.tags:
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if tag.get("type") == "Emoji":
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try:
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idx[tag["name"]] = proxied_media_url(tag["icon"]["url"])
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except KeyError:
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logger.warning(f"Failed to parse custom emoji {tag=}")
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continue
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for emoji_name, emoji_url in idx.items():
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content = content.replace(
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emoji_name,
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f'<img class="custom-emoji" src="{emoji_url}" title="{emoji_name}" alt="{emoji_name}">', # noqa: E501
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)
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return content
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def _html2text(content: str) -> str:
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return H2T.handle(content)
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def _replace_emoji(u: str, _) -> str:
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filename = hex(ord(u))[2:]
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return config.EMOJI_TPL.format(filename=filename, raw=u)
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def _emojify(text: str, is_local: bool) -> str:
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if not is_local:
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return text
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return emoji.replace_emoji(
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text,
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replace=_replace_emoji,
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)
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_templates.env.filters["domain"] = _filter_domain
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_templates.env.filters["media_proxy_url"] = _media_proxy_url
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_templates.env.filters["clean_html"] = _clean_html
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_templates.env.filters["timeago"] = _timeago
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_templates.env.filters["format_date"] = _format_date
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_templates.env.filters["has_media_type"] = _has_media_type
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_templates.env.filters["html2text"] = _html2text
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_templates.env.filters["emojify"] = _emojify
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_templates.env.filters["pluralize"] = _pluralize
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