331 lines
10 KiB
Python
331 lines
10 KiB
Python
import aiohttp
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import aiohttp.web
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import asyncio
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import logging
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import uuid
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import re
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import simplejson as json
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import cgi
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import datetime
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from urllib.parse import urlsplit
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from Crypto.PublicKey import RSA
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from cachetools import LFUCache
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from . import app, CONFIG
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from .database import DATABASE
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from .http_debug import http_debug
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from .remote_actor import fetch_actor
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from .http_signatures import sign_headers, generate_body_digest
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# generate actor keys if not present
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if "actorKeys" not in DATABASE:
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logging.info("No actor keys present, generating 4096-bit RSA keypair.")
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privkey = RSA.generate(4096)
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pubkey = privkey.publickey()
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DATABASE["actorKeys"] = {
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"publicKey": pubkey.exportKey('PEM').decode('utf-8'),
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"privateKey": privkey.exportKey('PEM').decode('utf-8')
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}
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PRIVKEY = RSA.importKey(DATABASE["actorKeys"]["privateKey"])
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PUBKEY = PRIVKEY.publickey()
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AP_CONFIG = CONFIG['ap']
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CACHE_SIZE = CONFIG.get('cache-size', 16384)
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CACHE = LFUCache(CACHE_SIZE)
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sem = asyncio.Semaphore(500)
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async def actor(request):
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data = {
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"@context": "https://www.w3.org/ns/activitystreams",
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"endpoints": {
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"sharedInbox": "https://{}/inbox".format(request.host)
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},
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"followers": "https://{}/followers".format(request.host),
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"following": "https://{}/following".format(request.host),
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"inbox": "https://{}/inbox".format(request.host),
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"name": "ActivityRelay",
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"type": "Application",
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"id": "https://{}/actor".format(request.host),
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"publicKey": {
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"id": "https://{}/actor#main-key".format(request.host),
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"owner": "https://{}/actor".format(request.host),
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"publicKeyPem": DATABASE["actorKeys"]["publicKey"]
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},
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"summary": "ActivityRelay bot",
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"preferredUsername": "relay",
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"url": "https://{}/actor".format(request.host)
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}
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return aiohttp.web.json_response(data, content_type='application/activity+json')
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app.router.add_get('/actor', actor)
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get_actor_inbox = lambda actor: actor.get('endpoints', {}).get('sharedInbox', actor['inbox'])
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async def push_message_to_actor(actor, message, our_key_id):
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inbox = get_actor_inbox(actor)
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url = urlsplit(inbox)
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# XXX: Digest
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data = json.dumps(message)
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headers = {
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'(request-target)': 'post {}'.format(url.path),
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'Content-Length': str(len(data)),
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'Content-Type': 'application/activity+json',
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'User-Agent': 'ActivityRelay',
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'Host': url.netloc,
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'Digest': 'SHA-256={}'.format(generate_body_digest(data)),
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'Date': datetime.datetime.utcnow().strftime('%a, %d %b %Y %H:%M:%S GMT')
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}
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headers['signature'] = sign_headers(headers, PRIVKEY, our_key_id)
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headers.pop('(request-target)')
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headers.pop('Host')
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logging.debug('%r >> %r', inbox, message)
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global sem
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async with sem:
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try:
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async with aiohttp.ClientSession(trace_configs=[http_debug()]) as session:
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async with session.post(inbox, data=data, headers=headers) as resp:
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if resp.status == 202:
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return
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resp_payload = await resp.text()
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logging.debug('%r >> resp %r', inbox, resp_payload)
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except Exception as e:
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logging.info('Caught %r while pushing to %r.', e, inbox)
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async def fetch_nodeinfo(domain):
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nodeinfo_data = await fetch_actor(f'https://{domain}/nodeinfo/2.0.json')
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software = nodeinfo_data.get('software')
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return software.get('name') if software else None
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async def follow_remote_actor(actor_uri):
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actor = await fetch_actor(actor_uri)
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if not actor:
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logging.info('failed to fetch actor at: %r', actor_uri)
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return
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if AP_CONFIG['whitelist_enabled'] is True and urlsplit(actor_uri).hostname not in AP_CONFIG['whitelist']:
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logging.info('refusing to follow non-whitelisted actor: %r', actor_uri)
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return
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logging.info('following: %r', actor_uri)
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message = {
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"@context": "https://www.w3.org/ns/activitystreams",
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"type": "Follow",
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"to": [actor['id']],
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"object": actor['id'],
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"id": "https://{}/activities/{}".format(AP_CONFIG['host'], uuid.uuid4()),
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"actor": "https://{}/actor".format(AP_CONFIG['host'])
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}
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await push_message_to_actor(actor, message, "https://{}/actor#main-key".format(AP_CONFIG['host']))
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async def unfollow_remote_actor(actor_uri):
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actor = await fetch_actor(actor_uri)
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if not actor:
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logging.info('failed to fetch actor at: %r', actor_uri)
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return
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logging.info('unfollowing: %r', actor_uri)
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message = {
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"@context": "https://www.w3.org/ns/activitystreams",
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"type": "Undo",
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"to": [actor['id']],
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"object": {
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"type": "Follow",
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"object": actor_uri,
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"actor": actor['id'],
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"id": "https://{}/activities/{}".format(AP_CONFIG['host'], uuid.uuid4())
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},
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"id": "https://{}/activities/{}".format(AP_CONFIG['host'], uuid.uuid4()),
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"actor": "https://{}/actor".format(AP_CONFIG['host'])
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}
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await push_message_to_actor(actor, message, "https://{}/actor#main-key".format(AP_CONFIG['host']))
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tag_re = re.compile(r'(<!--.*?-->|<[^>]*>)')
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def strip_html(data):
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no_tags = tag_re.sub('', data)
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return cgi.escape(no_tags)
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def distill_inboxes(actor, object_id):
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global DATABASE
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origin_hostname = urlsplit(object_id).hostname
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inbox = get_actor_inbox(actor)
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targets = [target for target in DATABASE.get('relay-list', []) if target != inbox]
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targets = [target for target in targets if urlsplit(target).hostname != origin_hostname]
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hostnames = [urlsplit(target).hostname for target in targets]
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assert inbox not in targets
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assert origin_hostname not in hostnames
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return targets
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def distill_object_id(activity):
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logging.debug('>> determining object ID for %r', activity['object'])
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obj = activity['object']
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if isinstance(obj, str):
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return obj
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return obj['id']
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async def handle_relay(actor, data, request):
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global CACHE
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object_id = distill_object_id(data)
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if object_id in CACHE:
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logging.debug('>> already relayed %r as %r', object_id, CACHE[object_id])
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return
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activity_id = "https://{}/activities/{}".format(request.host, uuid.uuid4())
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message = {
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"@context": "https://www.w3.org/ns/activitystreams",
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"type": "Announce",
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"to": ["https://{}/followers".format(request.host)],
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"actor": "https://{}/actor".format(request.host),
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"object": object_id,
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"id": activity_id
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}
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logging.debug('>> relay: %r', message)
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inboxes = distill_inboxes(actor, object_id)
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futures = [push_message_to_actor({'inbox': inbox}, message, 'https://{}/actor#main-key'.format(request.host)) for inbox in inboxes]
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asyncio.ensure_future(asyncio.gather(*futures))
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CACHE[object_id] = activity_id
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async def handle_forward(actor, data, request):
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object_id = distill_object_id(data)
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logging.debug('>> Relay %r', data)
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inboxes = distill_inboxes(actor, object_id)
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futures = [
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push_message_to_actor(
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{'inbox': inbox},
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data,
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'https://{}/actor#main-key'.format(request.host))
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for inbox in inboxes]
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asyncio.ensure_future(asyncio.gather(*futures))
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async def handle_follow(actor, data, request):
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global DATABASE
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following = DATABASE.get('relay-list', [])
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inbox = get_actor_inbox(actor)
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if urlsplit(inbox).hostname in AP_CONFIG['blocked_instances']:
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return
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if inbox not in following:
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following += [inbox]
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DATABASE['relay-list'] = following
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asyncio.ensure_future(follow_remote_actor(actor['id']))
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message = {
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"@context": "https://www.w3.org/ns/activitystreams",
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"type": "Accept",
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"to": [actor["id"]],
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"actor": "https://{}/actor".format(request.host),
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# this is wrong per litepub, but mastodon < 2.4 is not compliant with that profile.
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"object": {
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"type": "Follow",
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"id": data["id"],
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"object": "https://{}/actor".format(request.host),
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"actor": actor["id"]
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},
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"id": "https://{}/activities/{}".format(request.host, uuid.uuid4()),
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}
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asyncio.ensure_future(push_message_to_actor(actor, message, 'https://{}/actor#main-key'.format(request.host)))
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async def handle_undo(actor, data, request):
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global DATABASE
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child = data['object']
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if child['type'] == 'Follow':
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following = DATABASE.get('relay-list', [])
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inbox = get_actor_inbox(actor)
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if inbox in following:
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following.remove(inbox)
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DATABASE['relay-list'] = following
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await unfollow_remote_actor(actor['id'])
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processors = {
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'Announce': handle_relay,
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'Create': handle_relay,
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'Delete': handle_forward,
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'Follow': handle_follow,
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'Undo': handle_undo,
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'Update': handle_forward,
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}
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async def inbox(request):
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data = await request.json()
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instance = urlsplit(data['actor']).hostname
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if AP_CONFIG['block_relays']:
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software = await fetch_nodeinfo(instance)
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if software and 'relay' in software.lower():
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raise aiohttp.web.HTTPUnauthorized(body='relays have been blocked', content_type='text/plain')
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if 'actor' not in data or not request['validated']:
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raise aiohttp.web.HTTPUnauthorized(body='access denied', content_type='text/plain')
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elif data['type'] != 'Follow' and 'https://{}/inbox'.format(instance) not in DATABASE['relay-list']:
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raise aiohttp.web.HTTPUnauthorized(body='access denied', content_type='text/plain')
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elif AP_CONFIG['whitelist_enabled'] is True and instance not in AP_CONFIG['whitelist']:
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raise aiohttp.web.HTTPUnauthorized(body='access denied', content_type='text/plain')
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actor = await fetch_actor(data["actor"])
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actor_uri = 'https://{}/actor'.format(request.host)
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logging.debug(">> payload %r", data)
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processor = processors.get(data['type'], None)
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if processor:
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await processor(actor, data, request)
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return aiohttp.web.Response(body=b'{}', content_type='application/activity+json')
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app.router.add_post('/inbox', inbox)
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