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import uuid
from typing import cast
from urllib.parse import urlsplit
import sqlalchemy as sa
import sqlalchemy.exc as sa_exc
from flask import (
Blueprint,
Response,
abort,
flash,
redirect,
render_template,
request,
url_for,
)
from flask.typing import ResponseReturnValue
from flask_login import current_user, login_required, login_user, logout_user
from . import DATABASE as db
from . import forms
from .models import ReceivedWebmention, User
from .tasks.receiver import verify_webmention
root_page = Blueprint("root", __name__)
@root_page.route("/")
def index() -> ResponseReturnValue:
return redirect(url_for("root.received"))
@root_page.route("/login", methods=["GET", "POST"])
def login() -> ResponseReturnValue:
if current_user.is_authenticated:
return redirect(url_for("root.index"))
form = forms.LoginForm()
if form.validate_on_submit():
user = db.session.scalar(
sa.select(User).where(User.username == form.username.data)
)
if user is None or not user.check_password(form.password.data):
flash("Invalid username or password", "danger")
return redirect(url_for("root.login"))
login_user(user)
next_page = request.args.get("next")
if not next_page or urlsplit(next_page).netloc != "":
next_page = url_for("root.index")
return redirect(next_page)
return render_template("login.html", form=form)
@root_page.route("/logout")
def logout() -> ResponseReturnValue:
logout_user()
return redirect(url_for("root.index"))
@root_page.route("/received")
@login_required
def received() -> ResponseReturnValue:
webmentions = db.paginate(
sa.select(ReceivedWebmention).order_by(ReceivedWebmention.uuid.desc()),
per_page=25,
)
return render_template(
"received.html",
title="Received Webmentions",
webmentions=webmentions,
)
@root_page.route("/endpoint", methods=["POST"])
def endpoint() -> ResponseReturnValue:
form = forms.EndpointForm(meta={"csrf": False})
if not form.validate_on_submit():
return form.errors, 400
source = cast(str, form.source.data)
target = cast(str, form.target.data)
webmention = db.session.execute(
sa.select(ReceivedWebmention).where(
ReceivedWebmention.source == source,
ReceivedWebmention.target == target,
)
).scalar_one_or_none()
if webmention is None:
identifier = uuid.uuid7()
webmention = ReceivedWebmention(
uuid=identifier,
source=source,
target=target,
)
db.session.add(webmention)
try:
db.session.commit()
except sa_exc.IntegrityError:
db.session.rollback()
# Another request may have inserted the same source/target pair
# after our SELECT but before our COMMIT.
webmention = db.session.execute(
sa.select(ReceivedWebmention).where(
ReceivedWebmention.source == source,
ReceivedWebmention.target == target,
)
).scalar_one()
identifier = webmention.uuid
webmention.status = "received"
webmention.failure_reason = None
db.session.commit()
else:
identifier = webmention.uuid
# Re-sent webmention: re-verify the existing row.
webmention.status = "received"
webmention.failure_reason = None
db.session.commit()
verify_webmention(webmention.uuid)
status_url = url_for(
"root.status",
identifier=str(identifier),
_external=True,
)
return Response(
status=201,
headers={"Location": status_url},
)
@root_page.route("/status/<uuid:identifier>")
def status(identifier: uuid.UUID) -> ResponseReturnValue:
webmention = db.session.get(ReceivedWebmention, identifier)
if webmention is None:
return abort(404)
return render_template(
"status.html", title="Webmention status", webmention=webmention
)
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