218 lines
7.9 KiB
Python
218 lines
7.9 KiB
Python
import base64
|
|
import uuid
|
|
from functools import partial
|
|
|
|
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 django.conf import settings
|
|
from django.db import models
|
|
from django.utils import timezone
|
|
from django.utils.http import http_date
|
|
|
|
from core.ld import LDDocument
|
|
|
|
|
|
def upload_namer(prefix, instance, filename):
|
|
"""
|
|
Names uploaded images etc.
|
|
"""
|
|
now = timezone.now()
|
|
filename = base64.b32encode(uuid.uuid4().bytes).decode("ascii")
|
|
return f"{prefix}/{now.year}/{now.month}/{now.day}/{filename}"
|
|
|
|
|
|
class Identity(models.Model):
|
|
"""
|
|
Represents both local and remote Fediverse identities (actors)
|
|
"""
|
|
|
|
# The handle includes the domain!
|
|
handle = models.CharField(max_length=500, unique=True)
|
|
name = models.CharField(max_length=500, blank=True, null=True)
|
|
summary = models.TextField(blank=True, null=True)
|
|
|
|
actor_uri = models.CharField(max_length=500, blank=True, null=True)
|
|
profile_uri = models.CharField(max_length=500, blank=True, null=True)
|
|
inbox_uri = models.CharField(max_length=500, blank=True, null=True)
|
|
outbox_uri = models.CharField(max_length=500, blank=True, null=True)
|
|
icon_uri = models.CharField(max_length=500, blank=True, null=True)
|
|
image_uri = models.CharField(max_length=500, blank=True, null=True)
|
|
|
|
icon = models.ImageField(
|
|
upload_to=partial(upload_namer, "profile_images"), blank=True, null=True
|
|
)
|
|
image = models.ImageField(
|
|
upload_to=partial(upload_namer, "background_images"), blank=True, null=True
|
|
)
|
|
|
|
local = models.BooleanField()
|
|
users = models.ManyToManyField("users.User", related_name="identities")
|
|
manually_approves_followers = models.BooleanField(blank=True, null=True)
|
|
private_key = models.TextField(null=True, blank=True)
|
|
public_key = models.TextField(null=True, blank=True)
|
|
|
|
created = models.DateTimeField(auto_now_add=True)
|
|
updated = models.DateTimeField(auto_now=True)
|
|
fetched = models.DateTimeField(null=True, blank=True)
|
|
deleted = models.DateTimeField(null=True, blank=True)
|
|
|
|
@property
|
|
def short_handle(self):
|
|
if self.handle.endswith("@" + settings.DEFAULT_DOMAIN):
|
|
return self.handle.split("@", 1)[0]
|
|
return self.handle
|
|
|
|
@property
|
|
def domain(self):
|
|
return self.handle.split("@", 1)[1]
|
|
|
|
def generate_keypair(self):
|
|
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()
|
|
|
|
async def fetch_details(self):
|
|
if self.local:
|
|
raise ValueError("Cannot fetch local identities")
|
|
self.actor_uri = None
|
|
self.inbox_uri = None
|
|
self.profile_uri = None
|
|
# Go knock on webfinger and see what their address is
|
|
await self.fetch_webfinger()
|
|
# Fetch actor JSON
|
|
if self.actor_uri:
|
|
await self.fetch_actor()
|
|
self.fetched = timezone.now()
|
|
await sync_to_async(self.save)()
|
|
|
|
async def fetch_webfinger(self) -> bool:
|
|
async with httpx.AsyncClient() as client:
|
|
response = await client.get(
|
|
f"https://{self.domain}/.well-known/webfinger?resource=acct:{self.handle}",
|
|
headers={"Accept": "application/json"},
|
|
)
|
|
if response.status_code >= 400:
|
|
return False
|
|
data = response.json()
|
|
for link in data["links"]:
|
|
if (
|
|
link.get("type") == "application/activity+json"
|
|
and link.get("rel") == "self"
|
|
):
|
|
self.actor_uri = link["href"]
|
|
elif (
|
|
link.get("type") == "text/html"
|
|
and link.get("rel") == "http://webfinger.net/rel/profile-page"
|
|
):
|
|
self.profile_uri = link["href"]
|
|
return True
|
|
|
|
async def fetch_actor(self) -> bool:
|
|
async with httpx.AsyncClient() as client:
|
|
response = await client.get(
|
|
self.actor_uri,
|
|
headers={"Accept": "application/json"},
|
|
)
|
|
if response.status_code >= 400:
|
|
return False
|
|
data = response.json()
|
|
document = LDDocument(data)
|
|
for person in document.by_type(
|
|
"https://www.w3.org/ns/activitystreams#Person"
|
|
):
|
|
self.name = person.get("https://www.w3.org/ns/activitystreams#name")
|
|
self.summary = person.get(
|
|
"https://www.w3.org/ns/activitystreams#summary"
|
|
)
|
|
self.inbox_uri = person.get("http://www.w3.org/ns/ldp#inbox")
|
|
self.outbox_uri = person.get(
|
|
"https://www.w3.org/ns/activitystreams#outbox"
|
|
)
|
|
self.manually_approves_followers = person.get(
|
|
"https://www.w3.org/ns/activitystreams#manuallyApprovesFollowers'"
|
|
)
|
|
self.private_key = person.get(
|
|
"https://w3id.org/security#publicKey"
|
|
).get("https://w3id.org/security#publicKeyPem")
|
|
icon = person.get("https://www.w3.org/ns/activitystreams#icon")
|
|
if icon:
|
|
self.icon_uri = icon.get(
|
|
"https://www.w3.org/ns/activitystreams#url"
|
|
)
|
|
image = person.get("https://www.w3.org/ns/activitystreams#image")
|
|
if image:
|
|
self.image_uri = image.get(
|
|
"https://www.w3.org/ns/activitystreams#url"
|
|
)
|
|
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.
|
|
"""
|
|
private_key = serialization.load_pem_private_key(
|
|
self.private_key,
|
|
password=None,
|
|
)
|
|
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 = base64.b64encode(
|
|
private_key.sign(
|
|
signed_string,
|
|
padding.PSS(
|
|
mgf=padding.MGF1(hashes.SHA256()),
|
|
salt_length=padding.PSS.MAX_LENGTH,
|
|
),
|
|
hashes.SHA256(),
|
|
)
|
|
)
|
|
del headers["(request-target)"]
|
|
headers[
|
|
"Signature"
|
|
] = f'keyId="https://{settings.DEFAULT_DOMAIN}{self.urls.actor}",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.name or self.handle
|
|
|
|
class urls(urlman.Urls):
|
|
view = "/@{self.short_handle}/"
|
|
actor = "{view}actor/"
|
|
inbox = "{actor}inbox/"
|
|
activate = "{view}activate/"
|