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use std::collections::BTreeMap;
use anyhow::Context;
use base64::URL_SAFE_NO_PAD;
use pyo3::exceptions::PyAttributeError;
use pyo3::prelude::*;
use pyo3::types::PyBytes;
use pythonize::pythonize;
use serde::Deserialize;
use serde_json::Value;
use sha2::{Digest, Sha256};
use signed_json::Signed;
/*
depth: DictProperty[int] = DictProperty("depth")
content: DictProperty[JsonDict] = DictProperty("content")
hashes: DictProperty[Dict[str, str]] = DictProperty("hashes")
origin: DictProperty[str] = DictProperty("origin")
origin_server_ts: DictProperty[int] = DictProperty("origin_server_ts")
redacts: DefaultDictProperty[Optional[str]] = DefaultDictProperty("redacts", None)
room_id: DictProperty[str] = DictProperty("room_id")
sender: DictProperty[str] = DictProperty("sender")
# TODO state_key should be Optional[str]. This is generally asserted in Synapse
# by calling is_state() first (which ensures it is not None), but it is hard (not possible?)
# to properly annotate that calling is_state() asserts that state_key exists
# and is non-None. It would be better to replace such direct references with
# get_state_key() (and a check for None).
state_key: DictProperty[str] = DictProperty("state_key")
type: DictProperty[str] = DictProperty("type")
user_id: DictProperty[str] = DictProperty("sender")
*/
// FYI origin is not included here
#[derive(Debug, Clone, Deserialize)]
struct EventInner {
room_id: String,
depth: u64,
hashes: BTreeMap<String, String>,
origin_server_ts: u64,
redacts: Option<String>,
sender: String,
#[serde(rename = "type")]
event_type: String,
#[serde(default)]
state_key: Option<String>,
content: BTreeMap<String, Value>,
}
#[pyclass]
#[derive(Debug, Clone, Deserialize)]
struct Event {
#[pyo3(get)]
event_id: String,
#[serde(flatten)]
inner: Signed<EventInner>,
}
#[pymethods]
impl Event {
#[getter]
fn room_id(&self) -> &str {
&self.inner.room_id
}
fn get_pdu_json(&self) -> PyResult<String> {
// TODO: Do all the other things `get_pdu_json` does.
Ok(serde_json::to_string(&self.inner).context("bah")?)
}
#[getter]
fn content(&self, py: Python) -> PyResult<PyObject> {
Ok(pythonize(py, &self.inner.content)?)
}
#[getter]
fn state_key(&self) -> PyResult<&str> {
if let Some(state_key) = &self.inner.state_key {
Ok(state_key)
} else {
Err(PyAttributeError::new_err("state_key"))
}
}
}
#[pyfunction]
fn from_bytes(bytes: &PyBytes) -> PyResult<Event> {
let b = bytes.as_bytes();
let inner: Signed<EventInner> = serde_json::from_slice(b).context("parsing event")?;
let mut redacted: BTreeMap<String, Value> = redact(&inner).context("redacting")?;
redacted.remove("signatures");
redacted.remove("unsigned");
let redacted_json = serde_json::to_vec(&redacted).context("BAH")?;
let event_id = base64::encode_config(Sha256::digest(&redacted_json), URL_SAFE_NO_PAD);
let event = Event { event_id, inner };
Ok(event)
}
#[pymodule]
fn synapse_events(_py: Python, m: &PyModule) -> PyResult<()> {
m.add_function(wrap_pyfunction!(from_bytes, m)?)?;
Ok(())
}
fn redact<E: serde::de::DeserializeOwned>(
event: &Signed<EventInner>,
) -> Result<E, serde_json::Error> {
let etype = event.event_type.to_string();
let mut content = event.as_ref().content.clone();
let val = serde_json::to_value(event)?;
let allowed_keys = [
"event_id",
"sender",
"room_id",
"hashes",
"signatures",
"content",
"type",
"state_key",
"depth",
"prev_events",
"prev_state",
"auth_events",
"origin",
"origin_server_ts",
"membership",
];
let val = match val {
serde_json::Value::Object(obj) => obj,
_ => unreachable!(), // Events always serialize to an object
};
let mut val: serde_json::Map<_, _> = val
.into_iter()
.filter(|(k, _)| allowed_keys.contains(&(k as &str)))
.collect();
let mut new_content = serde_json::Map::new();
let mut copy_content = |key: &str| {
if let Some(v) = content.remove(key) {
new_content.insert(key.to_string(), v);
}
};
match &etype[..] {
"m.room.member" => copy_content("membership"),
"m.room.create" => copy_content("creator"),
"m.room.join_rules" => copy_content("join_rule"),
"m.room.aliases" => copy_content("aliases"),
"m.room.history_visibility" => copy_content("history_visibility"),
"m.room.power_levels" => {
for key in &[
"ban",
"events",
"events_default",
"kick",
"redact",
"state_default",
"users",
"users_default",
] {
copy_content(key);
}
}
_ => {}
}
val.insert(
"content".to_string(),
serde_json::Value::Object(new_content),
);
serde_json::from_value(serde_json::Value::Object(val))
}
|
