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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)
@classmethod
def by_handle(cls, handle, create=True):
if handle.startswith("@"):
raise ValueError("Handle must not start with @")
if "@" not in handle:
raise ValueError("Handle must contain domain")
try:
return cls.objects.filter(handle=handle).get()
except cls.DoesNotExist:
if create:
return cls.objects.create(handle=handle, local=False)
return None
@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]
@property
def data_age(self) -> float:
"""
How old our copy of this data is, in seconds
"""
if self.local:
return 0
if self.fetched is None:
return 10000000000
return (timezone.now() - self.fetched).total_seconds()
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"},
follow_redirects=True,
)
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"},
follow_redirects=True,
)
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/"
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