1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
use crate::{traits::ApubObject, APUB_JSON_CONTENT_TYPE};
use activitystreams::chrono::{Duration as ChronoDuration, NaiveDateTime, Utc};
use anyhow::anyhow;
use diesel::NotFound;
use lemmy_utils::{
request::{build_user_agent, retry},
settings::structs::Settings,
LemmyError,
};
use log::info;
use reqwest::{Client, StatusCode};
use serde::{Deserialize, Serialize};
use std::{
fmt::{Debug, Display, Formatter},
marker::PhantomData,
time::Duration,
};
use url::Url;
static REQUEST_LIMIT: i32 = 25;
lazy_static! {
static ref CLIENT: Client = Client::builder()
.user_agent(build_user_agent(&Settings::get()))
.build()
.expect("Couldn't build client");
}
#[derive(Clone, PartialEq, Serialize, Deserialize, Debug)]
#[serde(transparent)]
pub struct ObjectId<Kind>(Box<Url>, #[serde(skip)] PhantomData<Kind>)
where
Kind: ApubObject + Send + 'static,
for<'de2> <Kind as ApubObject>::ApubType: serde::Deserialize<'de2>;
impl<Kind> ObjectId<Kind>
where
Kind: ApubObject + Send + 'static,
for<'de2> <Kind as ApubObject>::ApubType: serde::Deserialize<'de2>,
{
pub fn new<T>(url: T) -> Self
where
T: Into<Url>,
{
ObjectId(Box::new(url.into()), PhantomData::<Kind>)
}
pub fn inner(&self) -> &Url {
&self.0
}
pub async fn dereference(
&self,
data: &<Kind as ApubObject>::DataType,
request_counter: &mut i32,
) -> Result<Kind, LemmyError> {
let db_object = self.dereference_from_db(data).await?;
if self.0.domain() == Some(&Settings::get().get_hostname_without_port()?) {
return match db_object {
None => Err(NotFound {}.into()),
Some(o) => Ok(o),
};
}
if let Some(object) = db_object {
if let Some(last_refreshed_at) = object.last_refreshed_at() {
if should_refetch_object(last_refreshed_at) {
return self
.dereference_from_http(data, request_counter, Some(object))
.await;
}
}
Ok(object)
}
else {
self
.dereference_from_http(data, request_counter, None)
.await
}
}
pub async fn dereference_local(
&self,
data: &<Kind as ApubObject>::DataType,
) -> Result<Kind, LemmyError> {
let object = self.dereference_from_db(data).await?;
object.ok_or_else(|| anyhow!("object not found in database {}", self).into())
}
async fn dereference_from_db(
&self,
data: &<Kind as ApubObject>::DataType,
) -> Result<Option<Kind>, LemmyError> {
let id = self.0.clone();
ApubObject::read_from_apub_id(*id, data).await
}
async fn dereference_from_http(
&self,
data: &<Kind as ApubObject>::DataType,
request_counter: &mut i32,
db_object: Option<Kind>,
) -> Result<Kind, LemmyError> {
debug_assert!(self.0.domain() != Some(&Settings::get().hostname));
info!("Fetching remote object {}", self.to_string());
*request_counter += 1;
if *request_counter > REQUEST_LIMIT {
return Err(LemmyError::from(anyhow!("Request limit reached")));
}
let res = retry(|| {
CLIENT
.get(self.0.as_str())
.header("Accept", APUB_JSON_CONTENT_TYPE)
.timeout(Duration::from_secs(60))
.send()
})
.await?;
if res.status() == StatusCode::GONE {
if let Some(db_object) = db_object {
db_object.delete(data).await?;
}
return Err(anyhow!("Fetched remote object {} which was deleted", self).into());
}
let res2: Kind::ApubType = res.json().await?;
Kind::verify(&res2, self.inner(), data, request_counter).await?;
Ok(Kind::from_apub(res2, data, request_counter).await?)
}
}
static ACTOR_REFETCH_INTERVAL_SECONDS: i64 = 24 * 60 * 60;
static ACTOR_REFETCH_INTERVAL_SECONDS_DEBUG: i64 = 10;
fn should_refetch_object(last_refreshed: NaiveDateTime) -> bool {
let update_interval = if cfg!(debug_assertions) {
ChronoDuration::seconds(ACTOR_REFETCH_INTERVAL_SECONDS_DEBUG)
} else {
ChronoDuration::seconds(ACTOR_REFETCH_INTERVAL_SECONDS)
};
let refresh_limit = Utc::now().naive_utc() - update_interval;
last_refreshed.lt(&refresh_limit)
}
impl<Kind> Display for ObjectId<Kind>
where
Kind: ApubObject + Send + 'static,
for<'de2> <Kind as ApubObject>::ApubType: serde::Deserialize<'de2>,
{
#[allow(clippy::to_string_in_display)]
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.0.to_string())
}
}
impl<Kind> From<ObjectId<Kind>> for Url
where
Kind: ApubObject + Send + 'static,
for<'de2> <Kind as ApubObject>::ApubType: serde::Deserialize<'de2>,
{
fn from(id: ObjectId<Kind>) -> Self {
*id.0
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::object_id::should_refetch_object;
#[test]
fn test_should_refetch_object() {
let one_second_ago = Utc::now().naive_utc() - ChronoDuration::seconds(1);
assert!(!should_refetch_object(one_second_ago));
let two_days_ago = Utc::now().naive_utc() - ChronoDuration::days(2);
assert!(should_refetch_object(two_days_ago));
}
}