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Rework task system and fetching.

Browse source 
I can taste how close follow is to working.
This commit is contained in:
Andrew Godwin 2022-11-06 21:30:07 -07:00
parent 0d5f7e7a89
commit fb6c409a9a
22 changed files with 501 additions and 206 deletions
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1
.gitignore vendored
View file

@ -1,2 +1,3 @@
*.psql
*.sqlite3
notes.md

59
core/ld.py
View file

@ -227,6 +227,49 @@ schemas = {
}
},
},
"*/schemas/litepub-0.1.jsonld": {
"contentType": "application/ld+json",
"documentUrl": "http://w3id.org/security/v1",
"contextUrl": None,
"document": {
"@context": [
"https://www.w3.org/ns/activitystreams",
"https://w3id.org/security/v1",
{
"Emoji": "toot:Emoji",
"Hashtag": "as:Hashtag",
"PropertyValue": "schema:PropertyValue",
"atomUri": "ostatus:atomUri",
"conversation": {"@id": "ostatus:conversation", "@type": "@id"},
"discoverable": "toot:discoverable",
"manuallyApprovesFollowers": "as:manuallyApprovesFollowers",
"capabilities": "litepub:capabilities",
"ostatus": "http://ostatus.org#",
"schema": "http://schema.org#",
"toot": "http://joinmastodon.org/ns#",
"misskey": "https://misskey-hub.net/ns#",
"fedibird": "http://fedibird.com/ns#",
"value": "schema:value",
"sensitive": "as:sensitive",
"litepub": "http://litepub.social/ns#",
"invisible": "litepub:invisible",
"directMessage": "litepub:directMessage",
"listMessage": {"@id": "litepub:listMessage", "@type": "@id"},
"quoteUrl": "as:quoteUrl",
"quoteUri": "fedibird:quoteUri",
"oauthRegistrationEndpoint": {
"@id": "litepub:oauthRegistrationEndpoint",
"@type": "@id",
},
"EmojiReact": "litepub:EmojiReact",
"ChatMessage": "litepub:ChatMessage",
"alsoKnownAs": {"@id": "as:alsoKnownAs", "@type": "@id"},
"vcard": "http://www.w3.org/2006/vcard/ns#",
"formerRepresentations": "litepub:formerRepresentations",
},
]
},
},
}
@ -244,12 +287,16 @@ def builtin_document_loader(url: str, options={}):
try:
return schemas[key]
except KeyError:
raise JsonLdError(
f"No schema built-in for {key!r}",
"jsonld.LoadDocumentError",
code="loading document failed",
cause="KeyError",
)
try:
key = "*" + pieces.path.rstrip("/")
return schemas[key]
except KeyError:
raise JsonLdError(
f"No schema built-in for {key!r}",
"jsonld.LoadDocumentError",
code="loading document failed",
cause="KeyError",
)
def canonicalise(json_data, include_security=False):

67
core/signatures.py
View file

@ -1,8 +1,14 @@
import base64
from typing import List, TypedDict
import json
from typing import Dict, List, Literal, TypedDict
from urllib.parse import urlparse
import httpx
from cryptography.hazmat.primitives import hashes
from django.http import HttpRequest
from django.utils.http import http_date
from users.models import Identity
class HttpSignature:
@ -25,7 +31,8 @@ class HttpSignature:
@classmethod
def headers_from_request(cls, request: HttpRequest, header_names: List[str]) -> str:
"""
Creates the to-be-signed header payload from a Django request"""
Creates the to-be-signed header payload from a Django request
"""
headers = {}
for header_name in header_names:
if header_name == "(request-target)":
@ -38,7 +45,7 @@ class HttpSignature:
return "\n".join(f"{name.lower()}: {value}" for name, value in headers.items())
@classmethod
def parse_signature(cls, signature) -> "SignatureDetails":
def parse_signature(cls, signature: str) -> "SignatureDetails":
bits = {}
for item in signature.split(","):
name, value = item.split("=", 1)
@ -52,6 +59,60 @@ class HttpSignature:
}
return signature_details
@classmethod
def compile_signature(cls, details: "SignatureDetails") -> str:
value = f'keyId="{details["keyid"]}",headers="'
value += " ".join(h.lower() for h in details["headers"])
value += '",signature="'
value += base64.b64encode(details["signature"]).decode("ascii")
value += f'",algorithm="{details["algorithm"]}"'
return value
@classmethod
async def signed_request(
self,
uri: str,
body: Dict,
identity: Identity,
content_type: str = "application/json",
method: Literal["post"] = "post",
):
"""
Performs an async request to the given path, with a document, signed
as an identity.
"""
uri_parts = urlparse(uri)
date_string = http_date()
body_bytes = json.dumps(body).encode("utf8")
headers = {
"(request-target)": f"{method} {uri_parts.path}",
"Host": uri_parts.hostname,
"Date": date_string,
"Digest": self.calculate_digest(body_bytes),
"Content-Type": content_type,
}
signed_string = "\n".join(
f"{name.lower()}: {value}" for name, value in headers.items()
)
headers["Signature"] = self.compile_signature(
{
"keyid": identity.urls.key.full(), # type:ignore
"headers": list(headers.keys()),
"signature": identity.sign(signed_string),
"algorithm": "rsa-sha256",
}
)
del headers["(request-target)"]
async with httpx.AsyncClient() as client:
print(f"Calling {method} {uri}")
print(body)
return await client.request(
method,
uri,
headers=headers,
content=body_bytes,
)
class SignatureDetails(TypedDict):
algorithm: str

10
miniq/migrations/0001_initial.py
View file

@ -1,4 +1,4 @@
# Generated by Django 4.1.3 on 2022-11-06 19:58
# Generated by Django 4.1.3 on 2022-11-07 04:19
from django.db import migrations, models
@ -25,7 +25,13 @@ class Migration(migrations.Migration):
(
"type",
models.CharField(
choices=[("identity_fetch", "Identity Fetch")], max_length=500
choices=[
("identity_fetch", "Identity Fetch"),
("inbox_item", "Inbox Item"),
("follow_request", "Follow Request"),
("follow_acknowledge", "Follow Acknowledge"),
],
max_length=500,
),
),
("priority", models.IntegerField(default=0)),

5
miniq/models.py
View file

@ -11,6 +11,9 @@ class Task(models.Model):
class TypeChoices(models.TextChoices):
identity_fetch = "identity_fetch"
inbox_item = "inbox_item"
follow_request = "follow_request"
follow_acknowledge = "follow_acknowledge"
type = models.CharField(max_length=500, choices=TypeChoices.choices)
priority = models.IntegerField(default=0)
@ -42,7 +45,7 @@ class Task(models.Model):
return next_task
@classmethod
def submit(cls, type, subject, payload=None, deduplicate=True):
def submit(cls, type, subject: str, payload=None, deduplicate=True):
# Deduplication is done against tasks that have not started yet only,
# and only on tasks without payloads
if deduplicate and not payload:

34
miniq/tasks.py Normal file
View file

@ -0,0 +1,34 @@
import traceback
from users.tasks.follow import handle_follow_request
from users.tasks.identity import handle_identity_fetch
from users.tasks.inbox import handle_inbox_item
class TaskHandler:
handlers = {
"identity_fetch": handle_identity_fetch,
"inbox_item": handle_inbox_item,
"follow_request": handle_follow_request,
}
def __init__(self, task):
self.task = task
self.subject = self.task.subject
self.payload = self.task.payload
async def handle(self):
try:
print(f"Task {self.task}: Starting")
if self.task.type not in self.handlers:
raise ValueError(f"Cannot handle type {self.task.type}")
await self.handlers[self.task.type](
self,
)
await self.task.complete()
print(f"Task {self.task}: Complete")
except BaseException as e:
print(f"Task {self.task}: Error {e}")
traceback.print_exc()
await self.task.fail(f"{e}\n\n" + traceback.format_exc())

30
miniq/views.py
View file

@ -1,6 +1,5 @@
import asyncio
import time
import traceback
import uuid
from asgiref.sync import sync_to_async
@ -8,7 +7,7 @@ from django.http import HttpResponse
from django.views import View
from miniq.models import Task
from users.models import Identity
from miniq.tasks import TaskHandler
class QueueProcessor(View):
@ -19,7 +18,8 @@ class QueueProcessor(View):
START_TIMEOUT = 30
TOTAL_TIMEOUT = 60
MAX_TASKS = 10
LOCK_TIMEOUT = 200
MAX_TASKS = 20
async def get(self, request):
start_time = time.monotonic()
@ -35,10 +35,11 @@ class QueueProcessor(View):
# Pop a task off the queue and run it
task = await sync_to_async(Task.get_one_available)(processor_id)
if task is not None:
self.tasks.append(asyncio.create_task(self.run_task(task)))
self.tasks.append(asyncio.create_task(TaskHandler(task).handle()))
handled += 1
# Prevent busylooping
await asyncio.sleep(0.01)
# TODO: Clean up old locks here
# Then wait for tasks to finish
while (time.monotonic() - start_time) < self.TOTAL_TIMEOUT:
# Remove completed tasks
@ -48,24 +49,3 @@ class QueueProcessor(View):
# Prevent busylooping
await asyncio.sleep(1)
return HttpResponse(f"{handled} tasks handled")
async def run_task(self, task):
try:
print(f"Task {task}: Starting")
handler = getattr(self, f"handle_{task.type}", None)
if handler is None:
raise ValueError(f"Cannot handle type {task.type}")
await handler(task.subject, task.payload)
await task.complete()
print(f"Task {task}: Complete")
except BaseException as e:
print(f"Task {task}: Error {e}")
traceback.print_exc()
await task.fail(f"{e}\n\n" + traceback.format_exc())
async def handle_identity_fetch(self, subject, payload):
# Get the actor URI via webfinger
actor_uri, handle = await Identity.fetch_webfinger(subject)
# Get or create the identity, then fetch
identity = await sync_to_async(Identity.by_actor_uri)(actor_uri, create=True)
await identity.fetch_actor()

2
statuses/migrations/0001_initial.py
View file

@ -1,4 +1,4 @@
# Generated by Django 4.1.3 on 2022-11-06 19:58
# Generated by Django 4.1.3 on 2022-11-07 04:19
import django.db.models.deletion
from django.db import migrations, models

5
takahe/settings.py
View file

@ -62,8 +62,9 @@ WSGI_APPLICATION = "takahe.wsgi.application"
DATABASES = {
"default": {
"ENGINE": "django.db.backends.sqlite3",
"NAME": BASE_DIR / "db.sqlite3",
"ENGINE": "django.db.backends.postgresql_psycopg2",
"NAME": "takahe",
"USER": "postgres",
}
}

1
takahe/urls.py
View file

@ -14,6 +14,7 @@ urlpatterns = [
path("@<handle>/", identity.ViewIdentity.as_view()),
path("@<handle>/actor/", identity.Actor.as_view()),
path("@<handle>/actor/inbox/", identity.Inbox.as_view()),
path("@<handle>/action/", identity.ActionIdentity.as_view()),
# Identity selection
path("@<handle>/activate/", identity.ActivateIdentity.as_view()),
path("identity/select/", identity.SelectIdentity.as_view()),

17
templates/identity/view.html
View file

@ -10,11 +10,11 @@
{% else %}
<img src="{% static "img/unknown-icon-128.png" %}" class="icon">
{% endif %}
{{ identity }} <small>@{{ identity.handle }}</small>
{{ identity.name_or_handle }} <small>@{{ identity.handle }}</small>
</h1>
{% if not identity.local %}
{% if not identity.actor_uri %}
{% if identity.outdated and not identity.name %}
<p class="system-note">
The system is still fetching this profile. Refresh to see updates.
</p>
@ -26,6 +26,19 @@
{% endif %}
{% endif %}
{% if request.identity %}
<form action="{{ identity.urls.action }}" method="POST">
{% csrf_token %}
{% if follow %}
<input type="hidden" name="action" value="unfollow">
<button>Unfollow</button>
{% else %}
<input type="hidden" name="action" value="follow">
<button>Follow</button>
{% endif %}
</form>
{% endif %}
{% for status in statuses %}
{% include "statuses/_status.html" %}
{% empty %}

2
users/admin.py
View file

@ -21,4 +21,4 @@ class UserEventAdmin(admin.ModelAdmin):
@admin.register(Identity)
class IdentityAdmin(admin.ModelAdmin):
list_display = ["id", "handle", "name", "local"]
list_display = ["id", "handle", "actor_uri", "name", "local"]

91
users/migrations/0001_initial.py
View file

@ -1,4 +1,4 @@
# Generated by Django 4.1.3 on 2022-11-06 19:58
# Generated by Django 4.1.3 on 2022-11-07 04:19
import functools
@ -56,11 +56,17 @@ class Migration(migrations.Migration):
),
(
"service_domain",
models.CharField(blank=True, max_length=250, null=True),
models.CharField(
blank=True,
db_index=True,
max_length=250,
null=True,
unique=True,
),
),
("local", models.BooleanField()),
("blocked", models.BooleanField(default=False)),
("public", models.BooleanField()),
("public", models.BooleanField(default=False)),
("created", models.DateTimeField(auto_now_add=True)),
("updated", models.DateTimeField(auto_now=True)),
(
@ -118,12 +124,7 @@ class Migration(migrations.Migration):
verbose_name="ID",
),
),
(
"actor_uri",
models.CharField(
blank=True, max_length=500, null=True, unique=True
),
),
("actor_uri", models.CharField(max_length=500, unique=True)),
("local", models.BooleanField()),
("username", models.CharField(blank=True, max_length=500, null=True)),
("name", models.CharField(blank=True, max_length=500, null=True)),
@ -191,39 +192,6 @@ class Migration(migrations.Migration):
"unique_together": {("username", "domain")},
},
),
migrations.CreateModel(
name="Follow",
fields=[
(
"id",
models.BigAutoField(
auto_created=True,
primary_key=True,
serialize=False,
verbose_name="ID",
),
),
("note", models.TextField(blank=True, null=True)),
("created", models.DateTimeField(auto_now_add=True)),
("updated", models.DateTimeField(auto_now=True)),
(
"source",
models.ForeignKey(
on_delete=django.db.models.deletion.CASCADE,
related_name="outbound_follows",
to="users.identity",
),
),
(
"target",
models.ForeignKey(
on_delete=django.db.models.deletion.CASCADE,
related_name="inbound_follows",
to="users.identity",
),
),
],
),
migrations.CreateModel(
name="Block",
fields=[
@ -259,4 +227,43 @@ class Migration(migrations.Migration):
),
],
),
migrations.CreateModel(
name="Follow",
fields=[
(
"id",
models.BigAutoField(
auto_created=True,
primary_key=True,
serialize=False,
verbose_name="ID",
),
),
("uri", models.CharField(blank=True, max_length=500, null=True)),
("note", models.TextField(blank=True, null=True)),
("requested", models.BooleanField(default=False)),
("accepted", models.BooleanField(default=False)),
("created", models.DateTimeField(auto_now_add=True)),
("updated", models.DateTimeField(auto_now=True)),
(
"source",
models.ForeignKey(
on_delete=django.db.models.deletion.CASCADE,
related_name="outbound_follows",
to="users.identity",
),
),
(
"target",
models.ForeignKey(
on_delete=django.db.models.deletion.CASCADE,
related_name="inbound_follows",
to="users.identity",
),
),
],
options={
"unique_together": {("source", "target")},
},
),
]

4
users/models/domain.py
View file

@ -48,14 +48,14 @@ class Domain(models.Model):
updated = models.DateTimeField(auto_now=True)
@classmethod
def get_remote_domain(cls, domain) -> "Domain":
def get_remote_domain(cls, domain: str) -> "Domain":
try:
return cls.objects.get(domain=domain, local=False)
except cls.DoesNotExist:
return cls.objects.create(domain=domain, local=False)
@classmethod
def get_local_domain(cls, domain) -> Optional["Domain"]:
def get_local_domain(cls, domain: str) -> Optional["Domain"]:
try:
return cls.objects.get(
models.Q(domain=domain) | models.Q(service_domain=domain)

50
users/models/follow.py
View file

@ -1,5 +1,9 @@
from typing import Optional
from django.db import models
from miniq.models import Task
class Follow(models.Model):
"""
@ -17,7 +21,53 @@ class Follow(models.Model):
related_name="inbound_follows",
)
uri = models.CharField(blank=True, null=True, max_length=500)
note = models.TextField(blank=True, null=True)
requested = models.BooleanField(default=False)
accepted = models.BooleanField(default=False)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
class Meta:
unique_together = [("source", "target")]
@classmethod
def maybe_get(cls, source, target) -> Optional["Follow"]:
"""
Returns a follow if it exists between source and target
"""
try:
return Follow.objects.get(source=source, target=target)
except Follow.DoesNotExist:
return None
@classmethod
def create_local(cls, source, target):
"""
Creates a Follow from a local Identity to the target
(which can be local or remote).
"""
if not source.local:
raise ValueError("You cannot initiate follows on a remote Identity")
try:
follow = Follow.objects.get(source=source, target=target)
except Follow.DoesNotExist:
follow = Follow.objects.create(source=source, target=target, uri="")
follow.uri = source.actor_uri + f"follow/{follow.pk}/"
if target.local:
follow.requested = True
follow.accepted = True
else:
Task.submit("follow_request", str(follow.pk))
follow.save()
return follow
def undo(self):
"""
Undoes this follow
"""
if not self.target.local:
Task.submit("follow_undo", str(self.pk))
self.delete()

176
users/models/identity.py
View file

@ -6,12 +6,11 @@ from urllib.parse import urlparse
import httpx
import urlman
from asgiref.sync import sync_to_async
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import padding, rsa
from asgiref.sync import async_to_sync, sync_to_async
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import rsa
from django.db import models
from django.utils import timezone
from django.utils.http import http_date
from OpenSSL import crypto
from core.ld import canonicalise
@ -34,7 +33,7 @@ class Identity(models.Model):
# The Actor URI is essentially also a PK - we keep the default numeric
# one around as well for making nice URLs etc.
actor_uri = models.CharField(max_length=500, blank=True, null=True, unique=True)
actor_uri = models.CharField(max_length=500, unique=True)
local = models.BooleanField()
users = models.ManyToManyField("users.User", related_name="identities")
@ -73,10 +72,35 @@ class Identity(models.Model):
fetched = models.DateTimeField(null=True, blank=True)
deleted = models.DateTimeField(null=True, blank=True)
### Model attributes ###
class Meta:
verbose_name_plural = "identities"
unique_together = [("username", "domain")]
class urls(urlman.Urls):
view = "/@{self.username}@{self.domain_id}/"
view_short = "/@{self.username}/"
action = "{view}action/"
actor = "{view}actor/"
activate = "{view}activate/"
key = "{actor}#main-key"
inbox = "{actor}inbox/"
outbox = "{actor}outbox/"
def get_scheme(self, url):
return "https"
def get_hostname(self, url):
return self.instance.domain.uri_domain
def __str__(self):
if self.username and self.domain_id:
return self.handle
return self.actor_uri
### Alternate constructors/fetchers ###
@classmethod
def by_handle(cls, handle, fetch=False, local=False):
if handle.startswith("@"):
@ -91,7 +115,15 @@ class Identity(models.Model):
return cls.objects.get(username=username, domain_id=domain)
except cls.DoesNotExist:
if fetch and not local:
return cls.objects.create(handle=handle, local=False)
actor_uri, handle = async_to_sync(cls.fetch_webfinger)(handle)
username, domain = handle.split("@")
domain = Domain.get_remote_domain(domain)
return cls.objects.create(
actor_uri=actor_uri,
username=username,
domain_id=domain,
local=False,
)
return None
@classmethod
@ -108,9 +140,17 @@ class Identity(models.Model):
except cls.DoesNotExist:
return cls.objects.create(actor_uri=uri, local=False)
### Dynamic properties ###
@property
def name_or_handle(self):
return self.name or self.handle
@property
def handle(self):
return f"{self.username}@{self.domain_id}"
if self.domain_id:
return f"{self.username}@{self.domain_id}"
return f"{self.username}@UNKNOWN-DOMAIN"
@property
def data_age(self) -> float:
@ -123,23 +163,12 @@ class Identity(models.Model):
return 10000000000
return (timezone.now() - self.fetched).total_seconds()
def generate_keypair(self):
if not self.local:
raise ValueError("Cannot generate keypair for remote user")
private_key = rsa.generate_private_key(
public_exponent=65537,
key_size=2048,
)
self.private_key = private_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.NoEncryption(),
)
self.public_key = private_key.public_key().public_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PublicFormat.SubjectPublicKeyInfo,
)
self.save()
@property
def outdated(self) -> bool:
# TODO: Setting
return self.data_age > 60 * 24 * 24
### Actor/Webfinger fetching ###
@classmethod
async def fetch_webfinger(cls, handle: str) -> Tuple[Optional[str], Optional[str]]:
@ -189,6 +218,8 @@ class Identity(models.Model):
self.outbox_uri = document.get("outbox")
self.summary = document.get("summary")
self.username = document.get("preferredUsername")
if "@value" in self.username:
self.username = self.username["@value"]
self.manually_approves_followers = document.get(
"as:manuallyApprovesFollowers"
)
@ -214,23 +245,42 @@ class Identity(models.Model):
await sync_to_async(self.save)()
return True
def sign(self, cleartext: str) -> str:
### Cryptography ###
def generate_keypair(self):
if not self.local:
raise ValueError("Cannot generate keypair for remote user")
private_key = rsa.generate_private_key(
public_exponent=65537,
key_size=2048,
)
self.private_key = private_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.NoEncryption(),
).decode("ascii")
self.public_key = (
private_key.public_key()
.public_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PublicFormat.SubjectPublicKeyInfo,
)
.decode("ascii")
)
self.save()
def sign(self, cleartext: str) -> bytes:
if not self.private_key:
raise ValueError("Cannot sign - no private key")
private_key = serialization.load_pem_private_key(
pkey = crypto.load_privatekey(
crypto.FILETYPE_PEM,
self.private_key.encode("ascii"),
password=None,
)
return base64.b64encode(
private_key.sign(
cleartext.encode("ascii"),
padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.MAX_LENGTH,
),
hashes.SHA256(),
)
).decode("ascii")
return crypto.sign(
pkey,
cleartext.encode("ascii"),
"sha256",
)
def verify_signature(self, signature: bytes, cleartext: str) -> bool:
if not self.public_key:
@ -247,55 +297,3 @@ class Identity(models.Model):
except crypto.Error:
return False
return True
async def signed_request(self, host, method, path, document):
"""
Delivers the document to the specified host, method, path and signed
as this user.
"""
date_string = http_date(timezone.now().timestamp())
headers = {
"(request-target)": f"{method} {path}",
"Host": host,
"Date": date_string,
}
headers_string = " ".join(headers.keys())
signed_string = "\n".join(f"{name}: {value}" for name, value in headers.items())
signature = self.sign(signed_string)
del headers["(request-target)"]
headers[
"Signature"
] = f'keyId="{self.urls.key.full()}",headers="{headers_string}",signature="{signature}"'
async with httpx.AsyncClient() as client:
return await client.request(
method,
"https://{host}{path}",
headers=headers,
data=document,
)
def validate_signature(self, request):
"""
Attempts to validate the signature on an incoming request.
Returns False if the signature is invalid, None if it cannot be verified
as we do not have the key locally, or the name of the actor if it is valid.
"""
pass
def __str__(self):
return self.handle or self.actor_uri
class urls(urlman.Urls):
view = "/@{self.username}@{self.domain_id}/"
view_short = "/@{self.username}/"
actor = "{view}actor/"
key = "{actor}#main-key"
inbox = "{actor}inbox/"
outbox = "{actor}outbox/"
activate = "{view}activate/"
def get_scheme(self, url):
return "https"
def get_hostname(self, url):
return self.instance.domain.uri_domain

19
users/shortcuts.py
View file

@ -1,10 +1,9 @@
from django.http import Http404
from django.shortcuts import get_object_or_404
from users.models import Domain, Identity
def by_handle_or_404(request, handle, local=True):
def by_handle_or_404(request, handle, local=True, fetch=False):
"""
Retrieves an Identity by its long or short handle.
Domain-sensitive, so it will understand short handles on alternate domains.
@ -19,15 +18,7 @@ def by_handle_or_404(request, handle, local=True):
domain = domain_instance.domain
else:
username, domain = handle.split("@", 1)
if local:
return get_object_or_404(
Identity.objects.filter(local=True),
username=username,
domain_id=domain,
)
else:
return get_object_or_404(
Identity,
username=username,
domain_id=domain,
)
identity = Identity.by_handle(handle, local=local, fetch=fetch)
if identity is None:
raise Http404(f"No identity for handle {handle}")
return identity

0
users/tasks/__init__.py Normal file
View file

28
users/tasks/follow.py Normal file
View file

@ -0,0 +1,28 @@
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
)
print(response)
print(response.content)

11
users/tasks/identity.py Normal file
View file

@ -0,0 +1,11 @@
from asgiref.sync import sync_to_async
from users.models import Identity
async def handle_identity_fetch(task_handler):
# Get the actor URI via webfinger
actor_uri, handle = await Identity.fetch_webfinger(task_handler.subject)
# Get or create the identity, then fetch
identity = await sync_to_async(Identity.by_actor_uri_with_create)(actor_uri)
await identity.fetch_actor()

36
users/tasks/inbox.py Normal file
View file

@ -0,0 +1,36 @@
from users.models import Follow, Identity
async def handle_inbox_item(task_handler):
type = task_handler.payload["type"].lower()
if type == "follow":
await inbox_follow(task_handler.payload)
elif type == "undo":
inner_type = task_handler.payload["object"]["type"].lower()
if inner_type == "follow":
await inbox_unfollow(task_handler.payload["object"])
else:
raise ValueError("Cannot undo activity of type {inner_type}")
else:
raise ValueError("Cannot handle activity of type {inner_type}")
async def inbox_follow(payload):
"""
Handles an incoming follow request
"""
# TODO: Manually approved follows
source = Identity.by_actor_uri_with_create(payload["actor"])
target = Identity.by_actor_uri(payload["object"])
# See if this follow already exists
try:
follow = Follow.objects.get(source=source, target=target)
except Follow.DoesNotExist:
follow = Follow.objects.create(source=source, target=target, uri=payload["id"])
# See if we need to acknowledge it
if not follow.acknowledged:
pass
async def inbox_unfollow(payload):
pass

59
users/views/identity.py
View file

@ -5,9 +5,11 @@ from asgiref.sync import async_to_sync
from django import forms
from django.conf import settings
from django.contrib.auth.decorators import login_required
from django.http import Http404, HttpResponseBadRequest, JsonResponse
from django.http import Http404, HttpResponse, HttpResponseBadRequest, JsonResponse
from django.shortcuts import redirect
from django.utils import timezone
from django.utils.decorators import method_decorator
from django.utils.http import parse_http_date
from django.views.decorators.csrf import csrf_exempt
from django.views.generic import FormView, TemplateView, View
@ -15,7 +17,8 @@ from core.forms import FormHelper
from core.ld import canonicalise
from core.signatures import HttpSignature
from miniq.models import Task
from users.models import Domain, Identity
from users.decorators import identity_required
from users.models import Domain, Follow, Identity
from users.shortcuts import by_handle_or_404
@ -24,16 +27,39 @@ class ViewIdentity(TemplateView):
template_name = "identity/view.html"
def get_context_data(self, handle):
identity = by_handle_or_404(self.request, handle, local=False)
identity = by_handle_or_404(
self.request,
handle,
local=False,
fetch=True,
)
statuses = identity.statuses.all()[:100]
if identity.data_age > settings.IDENTITY_MAX_AGE:
Task.submit("identity_fetch", identity.handle)
return {
"identity": identity,
"statuses": statuses,
"follow": Follow.maybe_get(self.request.identity, identity)
if self.request.identity
else None,
}
@method_decorator(identity_required, name="dispatch")
class ActionIdentity(View):
def post(self, request, handle):
identity = by_handle_or_404(self.request, handle, local=False)
# See what action we should perform
action = self.request.POST["action"]
if action == "follow":
existing_follow = Follow.maybe_get(self.request.identity, identity)
if not existing_follow:
Follow.create_local(self.request.identity, identity)
else:
raise ValueError(f"Cannot handle identity action {action}")
return redirect(identity.urls.view)
@method_decorator(login_required, name="dispatch")
class SelectIdentity(TemplateView):
@ -158,42 +184,43 @@ class Inbox(View):
if "HTTP_DIGEST" in request.META:
expected_digest = HttpSignature.calculate_digest(request.body)
if request.META["HTTP_DIGEST"] != expected_digest:
print("Bad digest")
return HttpResponseBadRequest()
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:
return HttpResponseBadRequest("Date is too far away")
# Get the signature details
if "HTTP_SIGNATURE" not in request.META:
print("No signature")
return HttpResponseBadRequest()
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 algorithm")
return HttpResponseBadRequest()
return HttpResponseBadRequest("Unknown signature algorithm")
# Create the signature payload
headers_string = HttpSignature.headers_from_request(
request, signature_details["headers"]
)
# Load the LD
document = canonicalise(json.loads(request.body))
print(signature_details)
print(headers_string)
print(document)
# Find the Identity by the actor on the incoming item
# This ensures that the signature used for the headers matches the actor
# described in the payload.
identity = Identity.by_actor_uri_with_create(document["actor"])
if not identity.public_key:
# See if we can fetch it right now
async_to_sync(identity.fetch_actor)()
if not identity.public_key:
print("Cannot retrieve actor")
return HttpResponseBadRequest("Cannot retrieve actor")
if not identity.verify_signature(
signature_details["signature"], headers_string
):
print("Bad signature")
# return HttpResponseBadRequest("Bad signature")
return JsonResponse({"status": "OK"})
return HttpResponseBadRequest("Bad signature")
# Hand off the item to be processed by the queue
Task.submit("inbox_item", subject=identity.actor_uri, payload=document)
return HttpResponse(status=202)
class Webfinger(View):