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first version of the script

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# hedgedoc-expire - remove old notes
A Python app that can be run regularly against a Postgres Hedgedoc database to remove old notes. Notes that are expired can be emailed to the author as a backup.
## Expiring old notes and revisions
Hedgedoc keeps notes and revisions (versions) of those notes forever. This might not be desirable, for example because of data protection reasons. With this utility, you can remove old revisions and old notes from the database.
### Expiring old revisions
All revisions that have been created before the specified age will be removed. If all revisions are older the newest revision that represents the current contents of the note will be retained.
## Local Development Setup
Use Docker Compose to bring up a local development environment.
* Hedgedoc: http://localhost:3000
* Adminer: http://localhost:8080/?pgsql=database&username=hedgedoc&db=hedgedoc&ns=public&password=geheim
You will need to create a user using the command line:
```sh
docker compose exec -it hedgedoc bin/manage_users --add foo@example.com --pass geheim
```

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# creates a local setup suitable for development and testing
services:
database:
image: docker.io/library/postgres:15-alpine
environment:
- "POSTGRES_USER=hedgedoc"
- "POSTGRES_PASSWORD=geheim"
- "POSTGRES_DB=hedgedoc"
volumes:
- database:/var/lib/postgresql/data
ports:
- "127.0.0.1:5432:5432"
restart: always
hedgedoc:
image: quay.io/hedgedoc/hedgedoc:latest
environment:
- "CMD_DB_URL=postgres://hedgedoc:geheim@database:5432/hedgedoc"
- "CMD_DOMAIN=localhost"
- "CMD_PROTOCOL_USESSL=false"
- "CMD_HSTS_ENABLE=false"
- "CMD_URL_ADDPORT=true"
- "CMD_ALLOW_FREEURL=true"
- "CMD_ALLOW_EMAIL_REGISTER=true"
- "CMD_ALLOW_ANONYMOUS=false"
- "CMD_ALLOW_ANONYMOUS_EDITS=true"
- "CMD_ALLOW_ANONYMOUS_VIEWS=true"
- "CMD_DEFAULT_PERMISSION=limited"
- "CMD_EMAIL=true"
volumes:
- uploads:/hedgedoc/public/uploads
ports:
- "127.0.0.1:3000:3000"
restart: always
depends_on:
- database
adminer:
image: docker.io/library/adminer:latest
environment: {}
ports:
- "127.0.0.1:8080:8080"
depends_on:
- database
volumes:
database: {}
uploads: {}
networks:
backend:
internal: true
frontend:

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#!/bin/env python
import argparse
import email
import json
import smtplib
import ssl
import sys
from datetime import datetime, timezone, timedelta
from email.mime.base import MIMEBase
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from os import getenv
import humanize
import pgsql
class Config:
def __init__(self):
"""
Get config from environment variables
"""
self.smtp_hostname = getenv('SMTP_HOSTNAME', 'localhost')
self.smtp_port = getenv('SMTP_PORT', '587')
self.smtp_username = getenv('SMTP_USERNAME', '')
self.smtp_password = getenv('SMTP_PASSWORD', '')
self.smtp_from = getenv('SMTP_FROM', '')
self.url = getenv('URL', 'http://localhost:3000')
class EmailSender:
def __init__(self, hostname: str, port: int, username: str, password: str, mail_from: str):
self.hostname = hostname
self.port = port
self.username = username
self.password = password
self.mail_from = mail_from
def send(self, message: email.message.Message) -> None:
smtp_server = smtplib.SMTP(self.hostname, port=self.port)
context = ssl.create_default_context()
smtp_server.starttls(context=context)
smtp_server.login(self.username, self.password)
smtp_server.send_message(message)
def notes_to_be_expired(cutoff: datetime) -> list[any]:
notes = []
with db.prepare('''SELECT
"Notes"."alias",
"Notes"."content",
"Notes"."createdAt",
"Notes"."ownerId",
"Notes"."shortid",
"Notes"."id",
"Notes"."title",
"Notes"."updatedAt",
"Users"."email"
FROM "Notes", "Users"
WHERE "Notes"."updatedAt" < $1
AND "Notes"."ownerId" = "Users"."id"
''') as notes_older_than:
for row in notes_older_than(cutoff):
notes.append({
'alias': row.alias if row.alias is not None else row.shortid,
'content': row.content,
'createdAt': row.createdAt,
'email': row.email,
"id": row.id,
'ownerId': row.ownerId,
'shortid': row.shortid,
'title': row.title,
'updatedAt': row.updatedAt
})
return notes
def revisions_to_be_expired(cutoff: datetime) -> list[any]:
"""
Obtain a list of revisions to be expired.
:param cutoff:
:param users:
:return:
"""
revisions = []
with db.prepare('''SELECT
"Revisions"."createdAt",
"Users"."email",
"Revisions"."id" as "revisionId",
"Notes"."id" as "noteId",
"Notes"."title"
FROM "Revisions", "Notes", "Users"
WHERE "Revisions"."createdAt" < $1
AND "Revisions"."noteId" = "Notes"."id"
AND "Notes"."ownerId" = "Users"."id"
''') as revs_older_than:
for row in revs_older_than(cutoff):
revisions.append({
'createdAt': row.createdAt,
'email': row.email,
'noteId': row.noteId,
'revisionId': row.revisionId,
'title': row.title
})
return revisions
def check_notes_to_be_expired(age: timedelta, config: Config) -> None:
cutoff = datetime.now(timezone.utc) - age
print(f'Notes to be deleted older than {cutoff} ({humanize.naturaldelta(age)}):')
for note in notes_to_be_expired(cutoff):
age = datetime.now(timezone.utc) - datetime.fromisoformat(note['updatedAt'])
print(f' {note["email"]} ({humanize.naturaldelta(age)}) {config.url}/{note["alias"]}: {note["title"]}')
def check_revisions_to_be_expired(age: timedelta) -> None:
cutoff = datetime.now(timezone.utc) - age
print(f'Revisions to be deleted older than {cutoff} ({humanize.naturaldelta(age)}):')
notes = {}
for row in revisions_to_be_expired(cutoff):
row['age'] = datetime.now(timezone.utc) - datetime.fromisoformat(row['createdAt'])
if row['noteId'] not in notes:
notes[row['noteId']] = []
notes[row['noteId']].append(row)
for id, revisions in notes.items():
email = revisions[0]['email']
print(f' {revisions[0]["email"]}: {revisions[0]["title"]}')
for rev in revisions:
print(f' {humanize.naturaldelta(rev["age"])}: {rev["revisionId"]}')
def expire_old_notes(age: timedelta, config: Config, mail: EmailSender) -> None:
cutoff = datetime.now(timezone.utc) - age
with db.prepare('DELETE FROM "Notes" WHERE "id" = $1') as delete_statement:
for note in notes_to_be_expired(cutoff):
try:
note_age = datetime.now(timezone.utc) - datetime.fromisoformat(note['updatedAt'])
msg = MIMEMultipart()
msg['From'] = mail.mail_from
msg['To'] = note["email"]
msg['Subject'] = f'Your HedgeDoc Note "{note["title"]}" has been expired'
msg.attach(MIMEText(dedent(f'''\
You created the note titled "{note["title"]}" on {note["createdAt"]}.
It was lasted updated {note['updatedAt']}, {humanize.naturaldelta(note_age)} ago. We expire all notes
that have not been updated within {humanize.naturaldelta(age)}.
Please find attached the contents of the latest revision of your note.
The Hedgedoc Admin team
'''
)))
md = MIMEBase('text', "markdown")
md.add_header('Content-Disposition', f'attachment; filename={note["title"]}')
md.set_payload(note["content"])
msg.attach(md)
mail.send(msg)
# email backup of the note sent, now we can delete it
delete_statement(note["id"])
except Exception as e:
print(f'Unable to send email to {note["email"]}: {e}', file=sys.stderr)
def expire_old_revisions(age: timedelta) -> None:
"""
Removes all revision on all notes that have been modified earlier than age.
:param age:
:return:
"""
cutoff = datetime.now(timezone.utc) - age
with db.prepare('DELETE FROM "Revisions" WHERE "createdAt" < $1') as delete:
delete(cutoff)
if __name__ == '__main__':
parser = argparse.ArgumentParser(
prog='hedgedoc-expire',
description='Remove old notes and revisions from Hedgedoc',
epilog='See https://git.hamburg.ccc.de/xxx')
parser.add_argument('-r', '--revisions', metavar='DAYS', type=float, default=7,
help='remove all revisions created more than these many days ago')
parser.add_argument('-n', '--notes', metavar='DAYS', type=float, default=90,
help='remove all notes not changed in these many days')
parser.add_argument('-c', '--check', action='store_true',
help='print what would be done, then exit')
args = parser.parse_args()
revisions_delta = timedelta(days=args.revisions)
notes_delta = timedelta(days=args.notes)
config = Config()
mail = EmailSender(config.smtp_hostname, config.smtp_port, config.smtp_username, config.smtp_password, config.smtp_from)
with pgsql.Connection(("localhost", 5432), "hedgedoc", "geheim") as db:
if args.check:
check_revisions_to_be_expired(revisions_delta)
check_notes_to_be_expired(notes_delta, config)
sys.exit(0)
expire_old_revisions(revisions_delta)
expire_old_notes(notes_delta, config, mail)

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[package.extras]
tests = ["freezegun", "pytest", "pytest-cov"]
[[package]]
name = "pgsql"
version = "2.2"
description = "PostgreSQL client library for Python 3"
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python-versions = ">=3.11"
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[tool.poetry]
name = "hedgedoc-expire"
version = "0.1.0"
description = "Remove old Hedgedoc notes"
authors = ["Stefan Bethke <stb@lassitu.de>"]
readme = "README.md"
[tool.poetry.dependencies]
python = "^3.12"
pgsql = "^2.2"
humanize = "^4.9.0"
[build-system]
requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"