use crate::{settings::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: F) -> Result where F: Fn() -> Fut, Fut: Future>, { retry_custom(|| async { Ok((f)().await) }).await } async fn retry_custom(f: F) -> Result where F: Fn() -> Fut, Fut: Future, reqwest::Error>>, { let mut response: Option> = 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, description: Option, thumbnail_url: Option, html: Option, } pub(crate) async fn fetch_iframely( client: &Client, url: &str, ) -> Result { 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, 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 { 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, ) -> ( Option, Option, Option, Option, ) { 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()); // } }