commit 1d8b4fd8c9328befd42fdb577b63c40e792e1ab7
Author: io <gie9ohbeixah@paperboats.net>
Date:   Fri May 20 01:28:46 2022 +0000

    initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..01fe8e4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.toml
+!*.example.toml
+*.timestamp
diff --git a/config.example.toml b/config.example.toml
new file mode 100644
index 0000000..e1efc95
--- /dev/null
+++ b/config.example.toml
@@ -0,0 +1,4 @@
+site = "https://botsin.space"
+access_token = ""
+timestamp_path = "last_post.timestamp"
+account = "example_1@example.com"
diff --git a/mirror_bot.py b/mirror_bot.py
new file mode 100755
index 0000000..3f1c247
--- /dev/null
+++ b/mirror_bot.py
@@ -0,0 +1,174 @@
+#!/usr/bin/env python
+# SPDX-License-Identifer: AGPL-3.0-only
+
+import io
+import sys
+import anyio
+import aiohttp
+import pleroma
+import argparse
+import platform
+import pendulum
+import aiosqlite
+import contextlib
+import qtoml as toml
+from utils import suppress
+from pleroma import Pleroma
+from functools import partial
+
+USER_AGENT = (
+	'mirror-bot; '
+	f'{aiohttp.__version__}; '
+	f'{platform.python_implementation()}/{platform.python_version()}'
+)
+
+UTC = pendulum.timezone('UTC')
+JSON_CONTENT_TYPE = 'application/json'
+ACTIVITYPUB_CONTENT_TYPE = 'application/activity+json'
+
+MIGRATION_VERSION = 1
+
+class PostMirror:
+	def __init__(self, *, config):
+		self.config = config
+
+	async def __aenter__(self):
+		stack = contextlib.AsyncExitStack()
+		self._fedi = await stack.enter_async_context(
+			Pleroma(api_base_url=self.config['site'], access_token=self.config['access_token']),
+		)
+		self._http = await stack.enter_async_context(
+			aiohttp.ClientSession(
+				headers={
+					'User-Agent': USER_AGENT,
+					'Accept': ', '.join([JSON_CONTENT_TYPE, ACTIVITYPUB_CONTENT_TYPE]),
+				},
+				trust_env=True,
+				raise_for_status=True,
+			),
+		)
+		self._ctx_stack = stack
+		return self
+
+	async def __aexit__(self, *excinfo):
+		return await self._ctx_stack.__aexit__(*excinfo)
+
+	async def mirror_posts(self):
+		outbox = await self.fetch_outbox(self.config['account'])
+		async with self._http.get(outbox['first']) as resp: page = await resp.json()
+		last_post = page['orderedItems'][0]['object']
+
+		try:
+			with open(self.config['timestamp_path']) as f:
+				last_mirrored_ts = pendulum.from_timestamp(float(f.read()))
+		except FileNotFoundError:
+			last_mirrored_ts = pendulum.from_timestamp(0.0)
+
+		last_post_ts = pendulum.parse(last_post['published'])
+
+		if last_post_ts < last_mirrored_ts:
+			print('Nothing to do')
+			return
+
+		# mirror the post and all its attachments
+		attachments = [None] * len(last_post['attachment'])
+		async with anyio.create_task_group() as tg:
+			for i, attachment in enumerate(last_post['attachment']):
+				tg.start_soon(self._mirror_attachment, i, attachments, attachment)
+		assert None not in attachments
+		await self._fedi.post(
+			last_post['source'],
+			cw=last_post['summary'],
+			visibility='unlisted',
+			media_ids=attachments,
+		)
+
+		with open(self.config['timestamp_path'], 'w') as f:
+			f.write(str(pendulum.now('UTC').timestamp()))
+
+	async def _mirror_attachment(self, i, out_attachments, attachment):
+		async with self._http.get(attachment['url']) as resp:
+			data = await resp.read()
+		out_attachments[i] = (await self._fedi.post_media(
+			io.BytesIO(data),
+			attachment['mediaType'],
+			filename=attachment['name'],
+			# TODO support descriptions
+		))['id']
+
+	async def fetch_outbox(self, handle):
+		"""
+		finger handle, a fully-qualified ActivityPub actor name,
+		returning their outbox info
+		"""
+		# it's fucking incredible how overengineered ActivityPub is btw
+		print('Fingering ', handle, '...', sep='')
+
+		username, at, instance = handle.lstrip('@').partition('@')
+		assert at == '@'
+
+		# i was planning on doing /.well-known/host-meta to find the webfinger URL, but
+		# 1) honk does not support host-meta
+		# 2) WebFinger is always located at the same location anyway
+
+		profile_url = await self._finger_actor(username, instance)
+
+		try:
+			async with self._http.get(profile_url) as resp: profile = await resp.json()
+		except aiohttp.ContentTypeError:
+			# we didn't get JSON, so just guess the outbox URL
+			outbox_url = profile_url + '/outbox'
+		else:
+			outbox_url = profile['outbox']
+
+		async with self._http.get(outbox_url) as resp: outbox = await resp.json()
+		assert outbox['type'] == 'OrderedCollection'
+		return outbox
+
+	async def _finger_actor(self, username, instance):
+		# despite HTTP being a direct violation of the WebFinger spec, assume e.g. Tor instances do not support
+		# HTTPS-over-onion
+		finger_url = f'http://{instance}/.well-known/webfinger?resource=acct:{username}@{instance}'
+		async with self._http.get(finger_url) as resp: finger_result = await resp.json()
+		return (profile_url := self._parse_webfinger_result(username, instance, finger_result))
+
+	def _parse_webfinger_result(self, username, instance, finger_result):
+		"""given webfinger data, return profile URL for handle"""
+		def check_content_type(type, ct): return ct == type or ct.startswith(type+';')
+		check_ap = partial(check_content_type, ACTIVITYPUB_CONTENT_TYPE)
+
+		try:
+			# note: the server might decide to return multiple links
+			# so we need to decide how to prefer one.
+			# i'd put "and yarl.URL(template).host == instance" here,
+			# but some instances have no subdomain for the handle yet use a subdomain for the canonical URL.
+			# Additionally, an instance could theoretically serve profile pages over I2P and the clearnet,
+			# for example.
+			return (profile_url := next(
+				link['href']
+				for link in finger_result['links']
+				if link['rel'] == 'self' and check_ap(link['type'])
+			))
+		except StopIteration:
+			# this should never happen either
+			raise RuntimeError(f'fatal: while fingering {username}@{instance}, failed to find a profile URL')
+
+async def amain():
+	parser = argparse.ArgumentParser(description='Mirror posts from another fediverse account')
+	parser.add_argument(
+		'-c', '--cfg', dest='cfg', default='config.toml', nargs='?',
+		help='Specify a custom location for the config file.'
+	)
+	args = parser.parse_args()
+	with open(args.cfg) as f:
+		config = toml.load(f)
+	async with PostMirror(config=config) as pm: await pm.mirror_posts()
+
+def main():
+	try:
+		anyio.run(amain)
+	except KeyboardInterrupt:
+		sys.exit(1)
+
+if __name__ == '__main__':
+	main()
diff --git a/pleroma.py b/pleroma.py
new file mode 100644
index 0000000..dae25ef
--- /dev/null
+++ b/pleroma.py
@@ -0,0 +1,183 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+
+import sys
+import yarl
+import json
+import hashlib
+import aiohttp
+from multidict import MultiDict
+from http import HTTPStatus
+
+def http_session_factory(headers={}):
+	py_version = '.'.join(map(str, sys.version_info))
+	user_agent = (
+		'pleroma-ebooks (https://lab.freak.university/KayFaraday/pleroma-ebooks); '
+		'aiohttp/{aiohttp.__version__}; '
+		'python/{py_version}'
+	)
+	return aiohttp.ClientSession(
+		headers={'User-Agent': user_agent, **headers},
+	)
+
+class BadRequest(Exception):
+	pass
+
+class LoginFailed(Exception):
+	pass
+
+class Pleroma:
+	def __init__(self, *, api_base_url, access_token):
+		self.api_base_url = api_base_url.rstrip('/')
+		self.access_token = access_token.strip()
+		self._session = http_session_factory({'Authorization': 'Bearer ' + self.access_token})
+		self._logged_in_id = None
+
+	async def __aenter__(self):
+		self._session = await self._session.__aenter__()
+		return self
+
+	async def __aexit__(self, *excinfo):
+		return await self._session.__aexit__(*excinfo)
+
+	async def request(self, method, path, **kwargs):
+		# blocklist of some horrible instances
+		if hashlib.sha256(
+			yarl.URL(self.api_base_url).host.encode()
+			+ bytes.fromhex('d590e3c48d599db6776e89dfc8ebaf53c8cd84866a76305049d8d8c5d4126ce1')
+		).hexdigest() in {
+			'56704d4d95b882e81c8e7765e9079be0afc4e353925ba9add8fd65976f52db83',
+			'1932431fa41a0baaccce7815115b01e40e0237035bb155713712075b887f5a19',
+			'a42191105a9f3514a1d5131969c07a95e06d0fdf0058f18e478823bf299881c9',
+		}:
+			raise RuntimeError('stop being a chud')
+
+		async with self._session.request(method, self.api_base_url + path, **kwargs) as resp:
+			if resp.status == HTTPStatus.BAD_REQUEST:
+				raise BadRequest((await resp.json())['error'])
+			#resp.raise_for_status()
+			return await resp.json()
+
+	async def verify_credentials(self):
+		return await self.request('GET', '/api/v1/accounts/verify_credentials')
+
+	me = verify_credentials
+
+	async def _get_logged_in_id(self):
+		if self._logged_in_id is not None:
+			return self._logged_in_id
+
+		me = await self.me()
+
+		try:
+			self._logged_in_id = me['id']
+		except KeyError:
+			raise LoginFailed(me)
+
+		return self._logged_in_id
+
+	async def following(self, account_id=None):
+		account_id = account_id or await self._get_logged_in_id()
+		return await self.request('GET', f'/api/v1/accounts/{account_id}/following')
+
+	@staticmethod
+	def _unpack_id(obj):
+		if isinstance(obj, dict) and 'id' in obj:
+			return obj['id']
+		return obj
+
+	async def status_context(self, id):
+		id = self._unpack_id(id)
+		return await self.request('GET', f'/api/v1/statuses/{id}/context')
+
+	async def post(self, content, *, in_reply_to_id=None, cw=None, visibility=None, media_ids=()):
+		if visibility not in {None, 'private', 'public', 'unlisted', 'direct'}:
+			raise ValueError('invalid visibility', visibility)
+
+		data = MultiDict(status=content)
+		if in_reply_to_id := self._unpack_id(in_reply_to_id):
+			data['in_reply_to_id'] = in_reply_to_id
+		if visibility is not None:
+			data['visibility'] = visibility
+		# normally, this would be a check against None.
+		# however, apparently Pleroma serializes posts without CWs as posts with an empty string
+		# as a CW, so per the robustness principle we'll accept that too.
+		if cw:
+			data['spoiler_text'] = cw
+
+		for media_id in media_ids:
+			data.add('media_ids[]', media_id)
+
+		return await self.request('POST', '/api/v1/statuses', data=data)
+
+	async def post_media(self, fp, mime_type, filename=None, description=None, focus=None):
+		data = aiohttp.FormData()
+		data.add_field('file', fp, content_type=mime_type, filename=filename)
+		if description is not None:
+			data.add_field('description', description)
+		if focus is not None:
+			data.add_field(','.join(map(str, focus)))
+		return await self.request('POST', '/api/v2/media', data=data)
+
+	async def reply(self, to_status, content, *, cw=None):
+		user_id = await self._get_logged_in_id()
+
+		mentioned_accounts = {}
+		mentioned_accounts[to_status['account']['id']] = to_status['account']['acct']
+		for account in to_status['mentions']:
+			if account['id'] != user_id and account['id'] not in mentioned_accounts:
+				mentioned_accounts[account['id']] = account['acct']
+
+		content = ''.join('@' + x + ' ' for x in mentioned_accounts.values()) + content
+
+		visibility = 'unlisted' if to_status['visibility'] == 'public' else to_status['visibility']
+		if not cw and 'spoiler_text' in to_status and to_status['spoiler_text']:
+			cw = 're: ' + to_status['spoiler_text']
+
+		return await self.post(content, in_reply_to_id=to_status['id'], cw=cw, visibility=visibility)
+
+	async def favorite(self, id):
+		id = self._unpack_id(id)
+		return await self.request('POST', f'/api/v1/statuses/{id}/favourite')
+
+	async def unfavorite(self, id):
+		id = self._unpack_id(id)
+		return await self.request('POST', f'/api/v1/statuses/{id}/unfavourite')
+
+	async def react(self, id, reaction):
+		id = self._unpack_id(id)
+		return await self.request('PUT', f'/api/v1/pleroma/statuses/{id}/reactions/{reaction}')
+
+	async def remove_reaction(self, id, reaction):
+		id = self._unpack_id(id)
+		return await self.request('DELETE', f'/api/v1/pleroma/statuses/{id}/reactions/{reaction}')
+
+	async def pin(self, id):
+		id = self._unpack_id(id)
+		return await self.request('POST', f'/api/v1/statuses/{id}/pin')
+
+	async def unpin(self, id):
+		id = self._unpack_id(id)
+		return await self.request('POST', f'/api/v1/statuses/{id}/unpin')
+
+	async def stream(self, stream_name, *, target_event_type=None):
+		async with self._session.ws_connect(
+			self.api_base_url + f'/api/v1/streaming?stream={stream_name}&access_token={self.access_token}'
+		) as ws:
+			async for msg in ws:
+				if msg.type == aiohttp.WSMsgType.TEXT:
+					event = msg.json()
+					# the only event type that doesn't define `payload` is `filters_changed`
+					if event['event'] == 'filters_changed':
+						yield event
+					elif target_event_type is None or event['event'] == target_event_type:
+						# don't ask me why the payload is also JSON encoded smh
+						yield json.loads(event['payload'])
+
+	async def stream_notifications(self):
+		async for notif in self.stream('user:notification', target_event_type='notification'):
+			yield notif
+
+	async def stream_mentions(self):
+		async for notif in self.stream_notifications():
+			if notif['type'] == 'mention':
+				yield notif
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..b1649bc
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,5 @@
+aiohttp ~= 3.0
+qtoml ~= 0.3.1
+anyio ~= 3.0
+aiosqlite ~= 0.17.0
+pendulum ~= 2.0
diff --git a/utils.py b/utils.py
new file mode 100644
index 0000000..7d08eae
--- /dev/null
+++ b/utils.py
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: AGPL-3.0-only
+
+import anyio
+import contextlib
+from functools import wraps
+
+def as_corofunc(f):
+	@wraps(f)
+	async def wrapped(*args, **kwargs):
+		# can't decide if i want an `anyio.sleep(0)` here.
+		return f(*args, **kwargs)
+	return wrapped
+
+def as_async_cm(cls):
+	@wraps(cls, updated=())  # cls.__dict__ doesn't support .update()
+	class wrapped(cls, contextlib.AbstractAsyncContextManager):
+		__aenter__ = as_corofunc(cls.__enter__)
+		__aexit__ = as_corofunc(cls.__exit__)
+	return wrapped
+
+suppress = as_async_cm(contextlib.suppress)