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Inbound and outbound follows basic working

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This commit is contained in:
Andrew Godwin 2022-11-10 23:42:43 -07:00
parent 2c3a129970
commit fbfad9fbf5
13 changed files with 206 additions and 103 deletions
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16
core/signatures.py
View file

@ -1,6 +1,6 @@
import base64
import json
from typing import Dict, List, Literal, TypedDict
from typing import TYPE_CHECKING, Dict, List, Literal, TypedDict
from urllib.parse import urlparse
import httpx
@ -8,7 +8,9 @@ from cryptography.hazmat.primitives import hashes
from django.http import HttpRequest
from django.utils.http import http_date
from users.models import Identity
# Prevent a circular import
if TYPE_CHECKING:
from users.models import Identity
class HttpSignature:
@ -73,7 +75,7 @@ class HttpSignature:
self,
uri: str,
body: Dict,
identity: Identity,
identity: "Identity",
content_type: str = "application/json",
method: Literal["post"] = "post",
):
@ -105,13 +107,17 @@ class HttpSignature:
del headers["(request-target)"]
async with httpx.AsyncClient() as client:
print(f"Calling {method} {uri}")
print(body)
return await client.request(
response = await client.request(
method,
uri,
headers=headers,
content=body_bytes,
)
if response.status_code >= 400:
raise ValueError(
f"Request error: {response.status_code} {response.content}"
)
return response
class SignatureDetails(TypedDict):

27
stator/graph.py
View file

@ -41,6 +41,7 @@ class StateGraph:
initial_state = state
# Collect terminal states
if state.terminal:
state.externally_progressed = True
terminal_states.add(state)
# Ensure they do NOT have a handler
try:
@ -52,17 +53,18 @@ class StateGraph:
f"Terminal state '{state}' should not have a handler method ({state.handler_name})"
)
else:
# Ensure non-terminal states have a try interval and a handler
if not state.try_interval:
raise ValueError(
f"State '{state}' has no try_interval and is not terminal"
)
try:
state.handler
except AttributeError:
raise ValueError(
f"State '{state}' does not have a handler method ({state.handler_name})"
)
# Ensure non-terminal/manual states have a try interval and a handler
if not state.externally_progressed:
if not state.try_interval:
raise ValueError(
f"State '{state}' has no try_interval and is not terminal or manual"
)
try:
state.handler
except AttributeError:
raise ValueError(
f"State '{state}' does not have a handler method ({state.handler_name})"
)
if initial_state is None:
raise ValueError("The graph has no initial state")
cls.initial_state = initial_state
@ -80,9 +82,11 @@ class State:
self,
try_interval: Optional[float] = None,
handler_name: Optional[str] = None,
externally_progressed: bool = False,
):
self.try_interval = try_interval
self.handler_name = handler_name
self.externally_progressed = externally_progressed
self.parents: Set["State"] = set()
self.children: Set["State"] = set()
@ -118,6 +122,7 @@ class State:
@property
def handler(self) -> Callable[[Any], Optional[str]]:
# Retrieve it by name off the graph
if self.handler_name is None:
raise AttributeError("No handler defined")
return getattr(self.graph, self.handler_name)

20
stator/models.py
View file

@ -80,7 +80,7 @@ class StatorModel(models.Model):
q = models.Q()
for state in cls.state_graph.states.values():
state = cast(State, state)
if not state.terminal:
if not state.externally_progressed:
q = q | models.Q(
(
models.Q(
@ -135,17 +135,31 @@ class StatorModel(models.Model):
self.state_ready = True
self.save()
async def atransition_attempt(self) -> Optional[str]:
async def atransition_attempt(self) -> Optional[State]:
"""
Attempts to transition the current state by running its handler(s).
"""
current_state = self.state_graph.states[self.state]
# If it's a manual progression state don't even try
# We shouldn't really be here in this case, but it could be a race condition
if current_state.externally_progressed:
print("Externally progressed state!")
return None
try:
next_state = await self.state_graph.states[self.state].handler(self)
next_state = await current_state.handler(self)
except BaseException as e:
await StatorError.acreate_from_instance(self, e)
traceback.print_exc()
else:
if next_state:
# Ensure it's a State object
if isinstance(next_state, str):
next_state = self.state_graph.states[next_state]
# Ensure it's a child
if next_state not in current_state.children:
raise ValueError(
f"Cannot transition from {current_state} to {next_state} - not a declared transition"
)
await self.atransition_perform(next_state)
return next_state
await self.__class__.objects.filter(pk=self.pk).aupdate(

6
stator/runner.py
View file

@ -50,9 +50,6 @@ class StatorRunner:
min(space_remaining, self.MAX_TASKS_PER_MODEL),
timezone.now() + datetime.timedelta(seconds=self.LOCK_TIMEOUT),
):
print(
f"Attempting transition on {instance._meta.label_lower}#{instance.pk}"
)
self.tasks.append(
asyncio.create_task(self.run_transition(instance))
)
@ -76,6 +73,9 @@ class StatorRunner:
Wrapper for atransition_attempt with fallback error handling
"""
try:
print(
f"Attempting transition on {instance._meta.label_lower}#{instance.pk} from state {instance.state}"
)
await instance.atransition_attempt()
except BaseException:
traceback.print_exc()

3
statuses/models/status.py
View file

@ -27,6 +27,9 @@ class Status(models.Model):
updated = models.DateTimeField(auto_now=True)
deleted = models.DateTimeField(null=True, blank=True)
class Meta:
verbose_name_plural = "statuses"
@classmethod
def create_local(cls, identity, text: str):
return cls.objects.create(

13
users/admin.py
View file

@ -1,6 +1,6 @@
from django.contrib import admin
from users.models import Domain, Follow, Identity, User, UserEvent
from users.models import Domain, Follow, Identity, InboxMessage, User, UserEvent
@admin.register(Domain)
@ -26,3 +26,14 @@ class IdentityAdmin(admin.ModelAdmin):
@admin.register(Follow)
class FollowAdmin(admin.ModelAdmin):
list_display = ["id", "source", "target", "state"]
@admin.register(InboxMessage)
class InboxMessageAdmin(admin.ModelAdmin):
list_display = ["id", "state", "message_type"]
actions = ["reset_state"]
@admin.action(description="Reset State")
def reset_state(self, request, queryset):
for instance in queryset:
instance.transition_perform("received")

12
users/models/domain.py
View file

@ -81,3 +81,15 @@ class Domain(models.Model):
def __str__(self):
return self.domain
def save(self, *args, **kwargs):
# Ensure that we are not conflicting with other domains
if Domain.objects.filter(service_domain=self.domain).exists():
raise ValueError(
f"Domain {self.domain} is already a service domain elsewhere!"
)
if self.service_domain:
if Domain.objects.filter(domain=self.service_domain).exists():
raise ValueError(
f"Service domain {self.service_domain} is already a domain elsewhere!"
)

112
users/models/follow.py
View file

@ -2,24 +2,110 @@ from typing import Optional
from django.db import models
from core.ld import canonicalise
from core.signatures import HttpSignature
from stator.models import State, StateField, StateGraph, StatorModel
class FollowStates(StateGraph):
unrequested = State(try_interval=30)
requested = State(try_interval=24 * 60 * 60)
accepted = State()
local_requested = State(try_interval=24 * 60 * 60)
remote_requested = State(try_interval=24 * 60 * 60)
accepted = State(externally_progressed=True)
undone_locally = State(try_interval=60 * 60)
undone_remotely = State()
unrequested.transitions_to(requested)
requested.transitions_to(accepted)
unrequested.transitions_to(local_requested)
unrequested.transitions_to(remote_requested)
local_requested.transitions_to(accepted)
remote_requested.transitions_to(accepted)
accepted.transitions_to(undone_locally)
undone_locally.transitions_to(undone_remotely)
@classmethod
async def handle_unrequested(cls, instance: "Follow"):
print("Would have tried to follow on", instance)
# Re-retrieve the follow with more things linked
follow = await Follow.objects.select_related(
"source", "source__domain", "target"
).aget(pk=instance.pk)
# Remote follows should not be here
if not follow.source.local:
return cls.remote_requested
# Construct the request
request = canonicalise(
{
"@context": "https://www.w3.org/ns/activitystreams",
"id": follow.uri,
"type": "Follow",
"actor": follow.source.actor_uri,
"object": follow.target.actor_uri,
}
)
# Sign it and send it
await HttpSignature.signed_request(
follow.target.inbox_uri, request, follow.source
)
return cls.local_requested
@classmethod
async def handle_requested(cls, instance: "Follow"):
print("Would have tried to requested on", instance)
async def handle_local_requested(cls, instance: "Follow"):
# TODO: Resend follow requests occasionally
pass
@classmethod
async def handle_remote_requested(cls, instance: "Follow"):
# Re-retrieve the follow with more things linked
follow = await Follow.objects.select_related(
"source", "source__domain", "target"
).aget(pk=instance.pk)
# Send an accept
request = canonicalise(
{
"@context": "https://www.w3.org/ns/activitystreams",
"id": follow.target.actor_uri + f"follow/{follow.pk}/#accept",
"type": "Follow",
"actor": follow.source.actor_uri,
"object": {
"id": follow.uri,
"type": "Follow",
"actor": follow.source.actor_uri,
"object": follow.target.actor_uri,
},
}
)
# Sign it and send it
await HttpSignature.signed_request(
follow.source.inbox_uri,
request,
identity=follow.target,
)
return cls.accepted
@classmethod
async def handle_undone_locally(cls, instance: "Follow"):
follow = Follow.objects.select_related(
"source", "source__domain", "target"
).get(pk=instance.pk)
# Construct the request
request = canonicalise(
{
"@context": "https://www.w3.org/ns/activitystreams",
"id": follow.uri + "#undo",
"type": "Undo",
"actor": follow.source.actor_uri,
"object": {
"id": follow.uri,
"type": "Follow",
"actor": follow.source.actor_uri,
"object": follow.target.actor_uri,
},
}
)
# Sign it and send it
await HttpSignature.signed_request(
follow.target.inbox_uri, request, follow.source
)
return cls.undone_remotely
class Follow(StatorModel):
@ -83,11 +169,17 @@ class Follow(StatorModel):
follow = cls.maybe_get(source=source, target=target)
if follow is None:
follow = Follow.objects.create(source=source, target=target, uri=uri)
if follow.state == FollowStates.fresh:
follow.transition_perform(FollowStates.requested)
if follow.state == FollowStates.unrequested:
follow.transition_perform(FollowStates.remote_requested)
@classmethod
def remote_accepted(cls, source, target):
print(f"accepted follow source {source} target {target}")
follow = cls.maybe_get(source=source, target=target)
if follow and follow.state == FollowStates.requested:
print(f"accepting follow {follow}")
if follow and follow.state in [
FollowStates.unrequested,
FollowStates.local_requested,
]:
follow.transition_perform(FollowStates.accepted)
print("accepted")

18
users/models/inbox_message.py
View file

@ -13,7 +13,7 @@ class InboxMessageStates(StateGraph):
@classmethod
async def handle_received(cls, instance: "InboxMessage"):
type = instance.message["type"].lower()
type = instance.message_type
if type == "follow":
await instance.follow_request()
elif type == "accept":
@ -30,6 +30,7 @@ class InboxMessageStates(StateGraph):
raise ValueError(f"Cannot handle activity of type undo.{inner_type}")
else:
raise ValueError(f"Cannot handle activity of type {type}")
return cls.processed
class InboxMessage(StatorModel):
@ -60,10 +61,17 @@ class InboxMessage(StatorModel):
"""
Handles an incoming acceptance of one of our follow requests
"""
Follow.remote_accepted(
source=Identity.by_actor_uri_with_create(self.message["actor"]),
target=Identity.by_actor_uri(self.message["object"]),
)
target = Identity.by_actor_uri_with_create(self.message["actor"])
source = Identity.by_actor_uri(self.message["object"]["actor"])
if source is None:
raise ValueError(
f"Follow-Accept has invalid source {self.message['object']['actor']}"
)
Follow.remote_accepted(source=source, target=target)
@property
def message_type(self):
return self.message["type"].lower()
async def follow_undo(self):
"""

5
users/shortcuts.py
View file

@ -19,7 +19,10 @@ def by_handle_or_404(request, handle, local=True, fetch=False) -> Identity:
else:
username, domain = handle.split("@", 1)
# Resolve the domain to the display domain
domain = Domain.get_remote_domain(domain).domain
domain_instance = Domain.get_domain(domain)
if domain_instance is None:
domain_instance = Domain.get_remote_domain(domain)
domain = domain_instance.domain
identity = Identity.by_username_and_domain(
username,
domain,

0
users/tasks/__init__.py
View file

62
users/tasks/follow.py
View file

@ -1,62 +0,0 @@
from core.ld import canonicalise
from core.signatures import HttpSignature
from users.models import Follow
async def handle_follow_request(task_handler):
"""
Request a follow from a remote server
"""
follow = await Follow.objects.select_related(
"source", "source__domain", "target"
).aget(pk=task_handler.subject)
# Construct the request
request = canonicalise(
{
"@context": "https://www.w3.org/ns/activitystreams",
"id": follow.uri,
"type": "Follow",
"actor": follow.source.actor_uri,
"object": follow.target.actor_uri,
}
)
# Sign it and send it
response = await HttpSignature.signed_request(
follow.target.inbox_uri, request, follow.source
)
if response.status_code >= 400:
raise ValueError(f"Request error: {response.status_code} {response.content}")
await Follow.objects.filter(pk=follow.pk).aupdate(requested=True)
def send_follow_undo(id):
"""
Request a follow from a remote server
"""
follow = Follow.objects.select_related("source", "source__domain", "target").get(
pk=id
)
# Construct the request
request = canonicalise(
{
"@context": "https://www.w3.org/ns/activitystreams",
"id": follow.uri + "#undo",
"type": "Undo",
"actor": follow.source.actor_uri,
"object": {
"id": follow.uri,
"type": "Follow",
"actor": follow.source.actor_uri,
"object": follow.target.actor_uri,
},
}
)
# Sign it and send it
from asgiref.sync import async_to_sync
response = async_to_sync(HttpSignature.signed_request)(
follow.target.inbox_uri, request, follow.source
)
if response.status_code >= 400:
raise ValueError(f"Request error: {response.status_code} {response.content}")
print(response)

15
users/views/identity.py
View file

@ -21,6 +21,10 @@ from users.models import Domain, Follow, Identity, IdentityStates, InboxMessage
from users.shortcuts import by_handle_or_404
class HttpResponseUnauthorized(HttpResponse):
status_code = 401
class ViewIdentity(TemplateView):
template_name = "identity/view.html"
@ -188,20 +192,26 @@ class Inbox(View):
if "HTTP_DIGEST" in request.META:
expected_digest = HttpSignature.calculate_digest(request.body)
if request.META["HTTP_DIGEST"] != expected_digest:
print("Wrong digest")
return HttpResponseBadRequest("Digest is incorrect")
# Verify date header
if "HTTP_DATE" in request.META:
header_date = parse_http_date(request.META["HTTP_DATE"])
if abs(timezone.now().timestamp() - header_date) > 60:
print(
f"Date mismatch - they sent {header_date}, now is {timezone.now().timestamp()}"
)
return HttpResponseBadRequest("Date is too far away")
# Get the signature details
if "HTTP_SIGNATURE" not in request.META:
print("No signature")
return HttpResponseBadRequest("No signature present")
signature_details = HttpSignature.parse_signature(
request.META["HTTP_SIGNATURE"]
)
# Reject unknown algorithms
if signature_details["algorithm"] != "rsa-sha256":
print("Unknown sig algo")
return HttpResponseBadRequest("Unknown signature algorithm")
# Create the signature payload
headers_string = HttpSignature.headers_from_request(
@ -217,13 +227,14 @@ class Inbox(View):
# See if we can fetch it right now
async_to_sync(identity.fetch_actor)()
if not identity.public_key:
print("Cannot get actor")
return HttpResponseBadRequest("Cannot retrieve actor")
if not identity.verify_signature(
signature_details["signature"], headers_string
):
return HttpResponseBadRequest("Bad signature")
return HttpResponseUnauthorized("Bad signature")
# Hand off the item to be processed by the queue
InboxMessage.objects.create(message=document)
InboxMessage.objects.create(message=document, state_ready=True)
return HttpResponse(status=202)