mirror of
https://git.sr.ht/~tsileo/microblog.pub
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Initial commit for new v2
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Thomas Sileo
276
app/activitypub.py
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276
app/activitypub.py
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import enum
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import json
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import mimetypes
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from typing import Any
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import httpx
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from app import config
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from app.httpsig import auth
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from app.key import get_pubkey_as_pem
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RawObject = dict[str, Any]
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AS_CTX = "https://www.w3.org/ns/activitystreams"
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AS_PUBLIC = "https://www.w3.org/ns/activitystreams#Public"
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ACTOR_TYPES = ["Application", "Group", "Organization", "Person", "Service"]
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class VisibilityEnum(str, enum.Enum):
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PUBLIC = "public"
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UNLISTED = "unlisted"
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DIRECT = "direct"
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MICROBLOGPUB = {
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"@context": [
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"https://www.w3.org/ns/activitystreams",
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"https://w3id.org/security/v1",
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{
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"Hashtag": "as:Hashtag",
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"PropertyValue": "schema:PropertyValue",
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"manuallyApprovesFollowers": "as:manuallyApprovesFollowers",
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"ostatus": "http://ostatus.org#",
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"schema": "http://schema.org",
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"sensitive": "as:sensitive",
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"toot": "http://joinmastodon.org/ns#",
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"totalItems": "as:totalItems",
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"value": "schema:value",
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"Emoji": "toot:Emoji",
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},
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]
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}
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DEFAULT_CTX = COLLECTION_CTX = [
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"https://www.w3.org/ns/activitystreams",
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"https://w3id.org/security/v1",
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{
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# AS ext
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"Hashtag": "as:Hashtag",
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"sensitive": "as:sensitive",
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"manuallyApprovesFollowers": "as:manuallyApprovesFollowers",
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# toot
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"toot": "http://joinmastodon.org/ns#",
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# "featured": "toot:featured",
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# schema
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"schema": "http://schema.org#",
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"PropertyValue": "schema:PropertyValue",
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"value": "schema:value",
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},
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]
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ME = {
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"@context": DEFAULT_CTX,
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"type": "Person",
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"id": config.ID,
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"following": config.BASE_URL + "/following",
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"followers": config.BASE_URL + "/followers",
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# "featured": ID + "/featured",
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"inbox": config.BASE_URL + "/inbox",
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"outbox": config.BASE_URL + "/outbox",
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"preferredUsername": config.USERNAME,
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"name": config.CONFIG.name,
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"summary": config.CONFIG.summary,
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"endpoints": {},
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"url": config.ID,
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"manuallyApprovesFollowers": False,
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"attachment": [],
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"icon": {
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"mediaType": mimetypes.guess_type(config.CONFIG.icon_url)[0],
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"type": "Image",
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"url": config.CONFIG.icon_url,
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},
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"publicKey": {
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"id": f"{config.ID}#main-key",
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"owner": config.ID,
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"publicKeyPem": get_pubkey_as_pem(),
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},
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"alsoKnownAs": [],
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}
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class NotAnObjectError(Exception):
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def __init__(self, url: str, resp: httpx.Response | None = None) -> None:
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message = f"{url} is not an AP activity"
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super().__init__(message)
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self.url = url
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self.resp = resp
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def fetch(url: str, params: dict[str, Any] | None = None) -> dict[str, Any]:
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resp = httpx.get(
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url,
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headers={
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"User-Agent": config.USER_AGENT,
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"Accept": config.AP_CONTENT_TYPE,
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},
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params=params,
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follow_redirects=True,
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)
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resp.raise_for_status()
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try:
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return resp.json()
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except json.JSONDecodeError:
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raise NotAnObjectError(url, resp)
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def parse_collection( # noqa: C901
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url: str | None = None,
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payload: RawObject | None = None,
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level: int = 0,
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) -> list[RawObject]:
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"""Resolve/fetch a `Collection`/`OrderedCollection`."""
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if level > 3:
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raise ValueError("recursion limit exceeded")
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# Go through all the pages
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out: list[RawObject] = []
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if url:
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payload = fetch(url)
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if not payload:
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raise ValueError("must at least prove a payload or an URL")
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ap_type = payload.get("type")
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if not ap_type:
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raise ValueError(f"Missing type: {payload=}")
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if level == 0 and ap_type not in ["Collection", "OrderedCollection"]:
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raise ValueError(f"Unexpected type {ap_type}")
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if payload["type"] in ["Collection", "OrderedCollection"]:
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if "orderedItems" in payload:
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return payload["orderedItems"]
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if "items" in payload:
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return payload["items"]
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if "first" in payload:
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if isinstance(payload["first"], str):
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out.extend(parse_collection(url=payload["first"], level=level + 1))
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else:
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if "orderedItems" in payload["first"]:
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out.extend(payload["first"]["orderedItems"])
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if "items" in payload["first"]:
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out.extend(payload["first"]["items"])
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n = payload["first"].get("next")
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if n:
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out.extend(parse_collection(url=n, level=level + 1))
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return out
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while payload:
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if ap_type in ["CollectionPage", "OrderedCollectionPage"]:
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if "orderedItems" in payload:
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out.extend(payload["orderedItems"])
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if "items" in payload:
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out.extend(payload["items"])
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n = payload.get("next")
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if n is None:
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break
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payload = fetch(n)
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else:
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raise ValueError("unexpected activity type {}".format(payload["type"]))
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return out
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def as_list(val: Any | list[Any]) -> list[Any]:
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if isinstance(val, list):
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return val
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return [val]
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def get_id(val: str | dict[str, Any]) -> str:
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if isinstance(val, dict):
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val = val["id"]
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if not isinstance(val, str):
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raise ValueError(f"Invalid ID type: {val}")
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return val
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def object_visibility(ap_activity: RawObject) -> VisibilityEnum:
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to = as_list(ap_activity.get("to", []))
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cc = as_list(ap_activity.get("cc", []))
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if AS_PUBLIC in to:
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return VisibilityEnum.PUBLIC
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elif AS_PUBLIC in cc:
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return VisibilityEnum.UNLISTED
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else:
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return VisibilityEnum.DIRECT
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def get_actor_id(activity: RawObject) -> str:
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if activity["type"] in ["Note", "Article", "Video"]:
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attributed_to = as_list(activity["attributedTo"])
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return get_id(attributed_to[0])
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else:
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return get_id(activity["actor"])
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def wrap_object(activity: RawObject) -> RawObject:
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return {
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"@context": AS_CTX,
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"actor": config.ID,
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"to": activity.get("to", []),
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"cc": activity.get("cc", []),
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"id": activity["id"] + "/activity",
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"object": remove_context(activity),
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"published": activity["published"],
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"type": "Create",
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}
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def wrap_object_if_needed(raw_object: RawObject) -> RawObject:
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if raw_object["type"] in ["Note"]:
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return wrap_object(raw_object)
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return raw_object
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def unwrap_activity(activity: RawObject) -> RawObject:
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# FIXME(ts): other types to unwrap?
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if activity["type"] == "Create":
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unwrapped_object = activity["object"]
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# Sanity check, ensure the wrapped object actor matches the activity
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if get_actor_id(unwrapped_object) != get_actor_id(activity):
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raise ValueError(
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f"Unwrapped object actor does not match activity: {activity}"
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)
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return unwrapped_object
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return activity
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def remove_context(raw_object: RawObject) -> RawObject:
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if "@context" not in raw_object:
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return raw_object
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a = dict(raw_object)
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del a["@context"]
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return a
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def get(url: str, params: dict[str, Any] | None = None) -> dict[str, Any]:
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resp = httpx.get(
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url,
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headers={"User-Agent": config.USER_AGENT, "Accept": config.AP_CONTENT_TYPE},
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params=params,
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follow_redirects=True,
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auth=auth,
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)
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resp.raise_for_status()
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return resp.json()
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def post(url: str, payload: dict[str, Any]) -> httpx.Response:
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resp = httpx.post(
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url,
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headers={
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"User-Agent": config.USER_AGENT,
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"Content-Type": config.AP_CONTENT_TYPE,
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},
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json=payload,
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auth=auth,
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)
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resp.raise_for_status()
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return resp
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