lemmy/crates/utils/src/request.rs

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use crate::{settings::structs::Settings, LemmyError};
use anyhow::anyhow;
use log::error;
use percent_encoding::{utf8_percent_encode, NON_ALPHANUMERIC};
use reqwest::Client;
use serde::Deserialize;
use std::future::Future;
use thiserror::Error;
#[derive(Clone, Debug, Error)]
#[error("Error sending request, {0}")]
struct SendError(pub String);
#[derive(Clone, Debug, Error)]
#[error("Error receiving response, {0}")]
pub struct RecvError(pub String);
pub async fn retry<F, Fut, T>(f: F) -> Result<T, reqwest::Error>
where
F: Fn() -> Fut,
Fut: Future<Output = Result<T, reqwest::Error>>,
{
retry_custom(|| async { Ok((f)().await) }).await
}
async fn retry_custom<F, Fut, T>(f: F) -> Result<T, reqwest::Error>
where
F: Fn() -> Fut,
Fut: Future<Output = Result<Result<T, reqwest::Error>, reqwest::Error>>,
{
let mut response: Option<Result<T, reqwest::Error>> = None;
for _ in 0u8..3 {
match (f)().await? {
Ok(t) => return Ok(t),
Err(e) => {
if e.is_timeout() {
response = Some(Err(e));
continue;
}
return Err(e);
}
}
}
response.unwrap()
}
#[derive(Deserialize, Debug)]
pub(crate) struct IframelyResponse {
title: Option<String>,
description: Option<String>,
thumbnail_url: Option<String>,
html: Option<String>,
}
pub(crate) async fn fetch_iframely(
client: &Client,
url: &str,
) -> Result<IframelyResponse, LemmyError> {
let fetch_url = format!("{}/oembed?url={}", Settings::get().iframely_url(), url);
let response = retry(|| client.get(&fetch_url).send()).await?;
let res: IframelyResponse = response
.json()
.await
.map_err(|e| RecvError(e.to_string()))?;
Ok(res)
}
#[derive(Deserialize, Debug, Clone)]
pub(crate) struct PictrsResponse {
files: Vec<PictrsFile>,
msg: String,
}
#[derive(Deserialize, Debug, Clone)]
pub(crate) struct PictrsFile {
file: String,
delete_token: String,
}
pub(crate) async fn fetch_pictrs(
client: &Client,
image_url: &str,
) -> Result<PictrsResponse, LemmyError> {
is_image_content_type(client, image_url).await?;
let fetch_url = format!(
"{}/image/download?url={}",
Settings::get().pictrs_url(),
utf8_percent_encode(image_url, NON_ALPHANUMERIC) // TODO this might not be needed
);
let response = retry(|| client.get(&fetch_url).send()).await?;
let response: PictrsResponse = response
.json()
.await
.map_err(|e| RecvError(e.to_string()))?;
if response.msg == "ok" {
Ok(response)
} else {
Err(anyhow!("{}", &response.msg).into())
}
}
pub async fn fetch_iframely_and_pictrs_data(
client: &Client,
url: Option<String>,
) -> (
Option<String>,
Option<String>,
Option<String>,
Option<String>,
) {
match &url {
Some(url) => {
// Fetch iframely data
let (iframely_title, iframely_description, iframely_thumbnail_url, iframely_html) =
match fetch_iframely(client, url).await {
Ok(res) => (res.title, res.description, res.thumbnail_url, res.html),
Err(e) => {
error!("iframely err: {}", e);
(None, None, None, None)
}
};
// Fetch pictrs thumbnail
let pictrs_hash = match iframely_thumbnail_url {
Some(iframely_thumbnail_url) => match fetch_pictrs(client, &iframely_thumbnail_url).await {
Ok(res) => Some(res.files[0].file.to_owned()),
Err(e) => {
error!("pictrs err: {}", e);
None
}
},
// Try to generate a small thumbnail if iframely is not supported
None => match fetch_pictrs(client, &url).await {
Ok(res) => Some(res.files[0].file.to_owned()),
Err(e) => {
error!("pictrs err: {}", e);
None
}
},
};
// The full urls are necessary for federation
let pictrs_thumbnail = if let Some(pictrs_hash) = pictrs_hash {
Some(format!(
"{}/pictrs/image/{}",
Settings::get().get_protocol_and_hostname(),
pictrs_hash
))
} else {
None
};
(
iframely_title,
iframely_description,
iframely_html,
pictrs_thumbnail,
)
}
None => (None, None, None, None),
}
}
async fn is_image_content_type(client: &Client, test: &str) -> Result<(), LemmyError> {
let response = retry(|| client.get(test).send()).await?;
if response
.headers()
.get("Content-Type")
.ok_or_else(|| anyhow!("No Content-Type header"))?
.to_str()?
.starts_with("image/")
{
Ok(())
} else {
Err(anyhow!("Not an image type.").into())
}
}
#[cfg(test)]
mod tests {
// These helped with testing
// #[test]
// fn test_iframely() {
// let res = fetch_iframely(client, "https://www.redspark.nu/?p=15341").await;
// assert!(res.is_ok());
// }
// #[test]
// fn test_pictshare() {
// let res = fetch_pictshare("https://upload.wikimedia.org/wikipedia/en/2/27/The_Mandalorian_logo.jpg");
// assert!(res.is_ok());
// let res_other = fetch_pictshare("https://upload.wikimedia.org/wikipedia/en/2/27/The_Mandalorian_logo.jpgaoeu");
// assert!(res_other.is_err());
// }
}