use crate::local_user_view_from_jwt; use actix_web::{error::ErrorBadRequest, web, Error, HttpRequest, HttpResponse, Result}; use anyhow::anyhow; use chrono::{DateTime, Utc}; use lemmy_api_common::{context::LemmyContext, utils::check_private_instance}; use lemmy_db_schema::{ source::{community::Community, person::Person}, traits::ApubActor, CommentSortType, CommunityVisibility, ListingType, SortType, }; use lemmy_db_views::{ post_view::PostQuery, structs::{PostView, SiteView}, }; use lemmy_db_views_actor::{ comment_reply_view::CommentReplyQuery, person_mention_view::PersonMentionQuery, structs::{CommentReplyView, PersonMentionView}, }; use lemmy_utils::{ cache_header::cache_1hour, error::{LemmyError, LemmyErrorType, LemmyResult}, utils::markdown::{markdown_to_html, sanitize_html}, }; use once_cell::sync::Lazy; use rss::{ extension::{dublincore::DublinCoreExtension, ExtensionBuilder, ExtensionMap}, Channel, EnclosureBuilder, Guid, Item, }; use serde::Deserialize; use std::{collections::BTreeMap, str::FromStr}; const RSS_FETCH_LIMIT: i64 = 20; #[derive(Deserialize)] struct Params { sort: Option, limit: Option, page: Option, } impl Params { fn sort_type(&self) -> Result { let sort_query = self .sort .clone() .unwrap_or_else(|| SortType::Hot.to_string()); SortType::from_str(&sort_query).map_err(ErrorBadRequest) } fn get_limit(&self) -> i64 { self.limit.unwrap_or(RSS_FETCH_LIMIT) } fn get_page(&self) -> i64 { self.page.unwrap_or(1) } } enum RequestType { Community, User, Front, Inbox, } pub fn config(cfg: &mut web::ServiceConfig) { cfg.service( web::scope("/feeds") .route("/{type}/{name}.xml", web::get().to(get_feed)) .route("/all.xml", web::get().to(get_all_feed).wrap(cache_1hour())) .route( "/local.xml", web::get().to(get_local_feed).wrap(cache_1hour()), ), ); } static RSS_NAMESPACE: Lazy> = Lazy::new(|| { let mut h = BTreeMap::new(); h.insert( "dc".to_string(), rss::extension::dublincore::NAMESPACE.to_string(), ); h.insert( "media".to_string(), "http://search.yahoo.com/mrss/".to_string(), ); h }); /// Removes any characters disallowed by the XML grammar. /// See https://www.w3.org/TR/xml/#NT-Char for details. fn sanitize_xml(input: String) -> String { input .chars() .filter(|&c| { matches!(c, '\u{09}' | '\u{0A}' | '\u{0D}' | '\u{20}'..='\u{D7FF}' | '\u{E000}'..='\u{FFFD}' | '\u{10000}'..='\u{10FFFF}') }) .collect() } #[tracing::instrument(skip_all)] async fn get_all_feed( info: web::Query, context: web::Data, ) -> Result { Ok( get_feed_data( &context, ListingType::All, info.sort_type()?, info.get_limit(), info.get_page(), ) .await?, ) } #[tracing::instrument(skip_all)] async fn get_local_feed( info: web::Query, context: web::Data, ) -> Result { Ok( get_feed_data( &context, ListingType::Local, info.sort_type()?, info.get_limit(), info.get_page(), ) .await?, ) } #[tracing::instrument(skip_all)] async fn get_feed_data( context: &LemmyContext, listing_type: ListingType, sort_type: SortType, limit: i64, page: i64, ) -> LemmyResult { let site_view = SiteView::read_local(&mut context.pool()).await?; check_private_instance(&None, &site_view.local_site)?; let posts = PostQuery { listing_type: (Some(listing_type)), sort: (Some(sort_type)), limit: (Some(limit)), page: (Some(page)), ..Default::default() } .list(&site_view.site, &mut context.pool()) .await?; let items = create_post_items(posts, &context.settings().get_protocol_and_hostname())?; let mut channel = Channel { namespaces: RSS_NAMESPACE.clone(), title: format!("{} - {}", site_view.site.name, listing_type), link: context.settings().get_protocol_and_hostname(), items, ..Default::default() }; if let Some(site_desc) = site_view.site.description { channel.set_description(&site_desc); } let rss = channel.to_string(); Ok( HttpResponse::Ok() .content_type("application/rss+xml") .body(rss), ) } #[tracing::instrument(skip_all)] async fn get_feed( req: HttpRequest, info: web::Query, context: web::Data, ) -> Result { let req_type: String = req.match_info().get("type").unwrap_or("none").parse()?; let param: String = req.match_info().get("name").unwrap_or("none").parse()?; let request_type = match req_type.as_str() { "u" => RequestType::User, "c" => RequestType::Community, "front" => RequestType::Front, "inbox" => RequestType::Inbox, _ => return Err(ErrorBadRequest(LemmyError::from(anyhow!("wrong_type")))), }; let builder = match request_type { RequestType::User => { get_feed_user( &context, &info.sort_type()?, &info.get_limit(), &info.get_page(), ¶m, ) .await } RequestType::Community => { get_feed_community( &context, &info.sort_type()?, &info.get_limit(), &info.get_page(), ¶m, ) .await } RequestType::Front => { get_feed_front( &context, &info.sort_type()?, &info.get_limit(), &info.get_page(), ¶m, ) .await } RequestType::Inbox => get_feed_inbox(&context, ¶m).await, } .map_err(ErrorBadRequest)?; let rss = builder.to_string(); Ok( HttpResponse::Ok() .content_type("application/rss+xml") .body(rss), ) } #[tracing::instrument(skip_all)] async fn get_feed_user( context: &LemmyContext, sort_type: &SortType, limit: &i64, page: &i64, user_name: &str, ) -> LemmyResult { let site_view = SiteView::read_local(&mut context.pool()).await?; let person = Person::read_from_name(&mut context.pool(), user_name, false).await?; check_private_instance(&None, &site_view.local_site)?; let posts = PostQuery { listing_type: (Some(ListingType::All)), sort: (Some(*sort_type)), creator_id: (Some(person.id)), limit: (Some(*limit)), page: (Some(*page)), ..Default::default() } .list(&site_view.site, &mut context.pool()) .await?; let items = create_post_items(posts, &context.settings().get_protocol_and_hostname())?; let channel = Channel { namespaces: RSS_NAMESPACE.clone(), title: format!("{} - {}", sanitize_xml(site_view.site.name), person.name), link: person.actor_id.to_string(), items, ..Default::default() }; Ok(channel) } #[tracing::instrument(skip_all)] async fn get_feed_community( context: &LemmyContext, sort_type: &SortType, limit: &i64, page: &i64, community_name: &str, ) -> LemmyResult { let site_view = SiteView::read_local(&mut context.pool()).await?; let community = Community::read_from_name(&mut context.pool(), community_name, false).await?; if community.visibility != CommunityVisibility::Public { return Err(LemmyErrorType::CouldntFindCommunity.into()); } check_private_instance(&None, &site_view.local_site)?; let posts = PostQuery { sort: (Some(*sort_type)), community_id: (Some(community.id)), limit: (Some(*limit)), page: (Some(*page)), ..Default::default() } .list(&site_view.site, &mut context.pool()) .await?; let items = create_post_items(posts, &context.settings().get_protocol_and_hostname())?; let mut channel = Channel { namespaces: RSS_NAMESPACE.clone(), title: format!("{} - {}", sanitize_xml(site_view.site.name), community.name), link: community.actor_id.to_string(), items, ..Default::default() }; if let Some(community_desc) = community.description { channel.set_description(markdown_to_html(&community_desc)); } Ok(channel) } #[tracing::instrument(skip_all)] async fn get_feed_front( context: &LemmyContext, sort_type: &SortType, limit: &i64, page: &i64, jwt: &str, ) -> LemmyResult { let site_view = SiteView::read_local(&mut context.pool()).await?; let local_user = local_user_view_from_jwt(jwt, context).await?; check_private_instance(&Some(local_user.clone()), &site_view.local_site)?; let posts = PostQuery { listing_type: (Some(ListingType::Subscribed)), local_user: (Some(&local_user)), sort: (Some(*sort_type)), limit: (Some(*limit)), page: (Some(*page)), ..Default::default() } .list(&site_view.site, &mut context.pool()) .await?; let protocol_and_hostname = context.settings().get_protocol_and_hostname(); let items = create_post_items(posts, &protocol_and_hostname)?; let mut channel = Channel { namespaces: RSS_NAMESPACE.clone(), title: format!("{} - Subscribed", sanitize_xml(site_view.site.name)), link: protocol_and_hostname, items, ..Default::default() }; if let Some(site_desc) = site_view.site.description { channel.set_description(markdown_to_html(&site_desc)); } Ok(channel) } #[tracing::instrument(skip_all)] async fn get_feed_inbox(context: &LemmyContext, jwt: &str) -> LemmyResult { let site_view = SiteView::read_local(&mut context.pool()).await?; let local_user = local_user_view_from_jwt(jwt, context).await?; let person_id = local_user.local_user.person_id; let show_bot_accounts = local_user.local_user.show_bot_accounts; let sort = CommentSortType::New; check_private_instance(&Some(local_user.clone()), &site_view.local_site)?; let replies = CommentReplyQuery { recipient_id: (Some(person_id)), my_person_id: (Some(person_id)), show_bot_accounts: (show_bot_accounts), sort: (Some(sort)), limit: (Some(RSS_FETCH_LIMIT)), ..Default::default() } .list(&mut context.pool()) .await?; let mentions = PersonMentionQuery { recipient_id: (Some(person_id)), my_person_id: (Some(person_id)), show_bot_accounts: (show_bot_accounts), sort: (Some(sort)), limit: (Some(RSS_FETCH_LIMIT)), ..Default::default() } .list(&mut context.pool()) .await?; let protocol_and_hostname = context.settings().get_protocol_and_hostname(); let items = create_reply_and_mention_items(replies, mentions, &protocol_and_hostname)?; let mut channel = Channel { namespaces: RSS_NAMESPACE.clone(), title: format!("{} - Inbox", sanitize_xml(site_view.site.name)), link: format!("{protocol_and_hostname}/inbox"), items, ..Default::default() }; if let Some(site_desc) = site_view.site.description { channel.set_description(&site_desc); } Ok(channel) } #[tracing::instrument(skip_all)] fn create_reply_and_mention_items( replies: Vec, mentions: Vec, protocol_and_hostname: &str, ) -> LemmyResult> { let mut reply_items: Vec = replies .iter() .map(|r| { let reply_url = format!("{}/comment/{}", protocol_and_hostname, r.comment.id); build_item( &r.creator.name, &r.comment.published, &reply_url, &r.comment.content, protocol_and_hostname, ) }) .collect::>>()?; let mut mention_items: Vec = mentions .iter() .map(|m| { let mention_url = format!("{}/comment/{}", protocol_and_hostname, m.comment.id); build_item( &m.creator.name, &m.comment.published, &mention_url, &m.comment.content, protocol_and_hostname, ) }) .collect::>>()?; reply_items.append(&mut mention_items); Ok(reply_items) } #[tracing::instrument(skip_all)] fn build_item( creator_name: &str, published: &DateTime, url: &str, content: &str, protocol_and_hostname: &str, ) -> LemmyResult { // TODO add images let author_url = format!("{protocol_and_hostname}/u/{creator_name}"); let guid = Some(Guid { permalink: true, value: url.to_owned(), }); let description = Some(markdown_to_html(content)); Ok(Item { title: Some(format!("Reply from {creator_name}")), author: Some(format!( "/u/{creator_name} (link)" )), pub_date: Some(published.to_rfc2822()), comments: Some(url.to_owned()), link: Some(url.to_owned()), guid, description, ..Default::default() }) } #[tracing::instrument(skip_all)] fn create_post_items(posts: Vec, protocol_and_hostname: &str) -> LemmyResult> { let mut items: Vec = Vec::new(); for p in posts { let post_url = format!("{}/post/{}", protocol_and_hostname, p.post.id); let community_url = format!( "{}/c/{}", protocol_and_hostname, sanitize_html(&p.community.name) ); let dublin_core_ext = Some(DublinCoreExtension { creators: vec![p.creator.actor_id.to_string()], ..DublinCoreExtension::default() }); let guid = Some(Guid { permalink: true, value: post_url.clone(), }); let mut description = format!("submitted by {} to {}
{} points | {} comments", p.creator.actor_id, sanitize_html(&p.creator.name), community_url, sanitize_html(&p.community.name), p.counts.score, post_url, p.counts.comments); // If its a url post, add it to the description // and see if we can parse it as a media enclosure. let enclosure_opt = p.post.url.map(|url| { let link_html = format!("
{url}"); description.push_str(&link_html); let mime_type = p .post .url_content_type .unwrap_or_else(|| "application/octet-stream".to_string()); let mut enclosure_bld = EnclosureBuilder::default(); enclosure_bld.url(url.as_str().to_string()); enclosure_bld.mime_type(mime_type); enclosure_bld.length("0".to_string()); enclosure_bld.build() }); if let Some(body) = p.post.body { let html = markdown_to_html(&body); description.push_str(&html); } let mut extensions = ExtensionMap::new(); // If there's a thumbnail URL, add a media:content tag to display it. // See https://www.rssboard.org/media-rss#media-content for details. if let Some(url) = p.post.thumbnail_url { let mut thumbnail_ext = ExtensionBuilder::default(); thumbnail_ext.name("media:content".to_string()); thumbnail_ext.attrs(BTreeMap::from([ ("url".to_string(), url.to_string()), ("medium".to_string(), "image".to_string()), ])); extensions.insert( "media".to_string(), BTreeMap::from([("content".to_string(), vec![thumbnail_ext.build()])]), ); } let i = Item { title: Some(sanitize_html(sanitize_xml(p.post.name).as_str())), pub_date: Some(p.post.published.to_rfc2822()), comments: Some(post_url.clone()), guid, description: Some(sanitize_xml(description)), dublin_core_ext, link: Some(post_url.clone()), extensions, enclosure: enclosure_opt, ..Default::default() }; items.push(i); } Ok(items) }