lemmy/server/src/routes/feeds.rs

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use super::*;
use crate::db::comment_view::{ReplyQueryBuilder, ReplyView};
use crate::db::community::Community;
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use crate::db::post_view::{PostQueryBuilder, PostView};
use crate::db::site_view::SiteView;
use crate::db::user::{Claims, User_};
use crate::db::user_mention_view::{UserMentionQueryBuilder, UserMentionView};
use crate::db::{ListingType, SortType};
use crate::{markdown_to_html, Settings};
use actix_web::{web, HttpResponse, Result};
use chrono::{DateTime, NaiveDateTime, Utc};
use diesel::r2d2::{ConnectionManager, Pool};
use diesel::PgConnection;
use failure::Error;
use rss::{CategoryBuilder, ChannelBuilder, GuidBuilder, Item, ItemBuilder};
use serde::Deserialize;
use std::str::FromStr;
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use strum::ParseError;
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#[derive(Deserialize)]
pub struct Params {
sort: Option<String>,
}
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enum RequestType {
Community,
User,
Front,
Inbox,
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}
pub fn config(cfg: &mut web::ServiceConfig) {
cfg
.route("/feeds/{type}/{name}.xml", web::get().to(feeds::get_feed))
.route("/feeds/all.xml", web::get().to(feeds::get_all_feed));
}
async fn get_all_feed(
info: web::Query<Params>,
db: web::Data<Pool<ConnectionManager<PgConnection>>>,
) -> Result<HttpResponse, actix_web::Error> {
let res = web::block(move || {
let conn = db.get()?;
get_feed_all_data(&conn, &get_sort_type(info)?)
})
.await
.map(|rss| {
HttpResponse::Ok()
.content_type("application/rss+xml")
.body(rss)
})
.map_err(|_| HttpResponse::InternalServerError())?;
Ok(res)
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}
fn get_feed_all_data(conn: &PgConnection, sort_type: &SortType) -> Result<String, failure::Error> {
let site_view = SiteView::read(&conn)?;
let posts = PostQueryBuilder::create(&conn)
.listing_type(ListingType::All)
.sort(sort_type)
.list()?;
let items = create_post_items(posts);
let mut channel_builder = ChannelBuilder::default();
channel_builder
.title(&format!("{} - All", site_view.name))
.link(format!("https://{}", Settings::get().hostname))
.items(items);
if let Some(site_desc) = site_view.description {
channel_builder.description(&site_desc);
}
Ok(channel_builder.build().unwrap().to_string())
}
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async fn get_feed(
path: web::Path<(String, String)>,
info: web::Query<Params>,
db: web::Data<Pool<ConnectionManager<PgConnection>>>,
) -> Result<HttpResponse, actix_web::Error> {
let res = web::block(move || {
let conn = db.get()?;
let sort_type = get_sort_type(info)?;
let request_type = match path.0.as_ref() {
"u" => RequestType::User,
"c" => RequestType::Community,
"front" => RequestType::Front,
"inbox" => RequestType::Inbox,
_ => return Err(format_err!("wrong_type")),
};
let param = path.1.to_owned();
match request_type {
RequestType::User => get_feed_user(&conn, &sort_type, param),
RequestType::Community => get_feed_community(&conn, &sort_type, param),
RequestType::Front => get_feed_front(&conn, &sort_type, param),
RequestType::Inbox => get_feed_inbox(&conn, param),
}
})
.await
.map(|builder| builder.build().unwrap().to_string())
.map(|rss| {
HttpResponse::Ok()
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.content_type("application/rss+xml")
.body(rss)
})
.map_err(|_| HttpResponse::InternalServerError())?;
Ok(res)
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}
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fn get_sort_type(info: web::Query<Params>) -> Result<SortType, ParseError> {
let sort_query = info
.sort
.to_owned()
.unwrap_or_else(|| SortType::Hot.to_string());
SortType::from_str(&sort_query)
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}
fn get_feed_user(
conn: &PgConnection,
sort_type: &SortType,
user_name: String,
) -> Result<ChannelBuilder, Error> {
let site_view = SiteView::read(&conn)?;
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let user = User_::find_by_username(&conn, &user_name)?;
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let user_url = user.get_profile_url();
let posts = PostQueryBuilder::create(&conn)
.listing_type(ListingType::All)
.sort(sort_type)
.for_creator_id(user.id)
.list()?;
let items = create_post_items(posts);
let mut channel_builder = ChannelBuilder::default();
channel_builder
.title(&format!("{} - {}", site_view.name, user.name))
.link(user_url)
.items(items);
Ok(channel_builder)
}
fn get_feed_community(
conn: &PgConnection,
sort_type: &SortType,
community_name: String,
) -> Result<ChannelBuilder, Error> {
let site_view = SiteView::read(&conn)?;
let community = Community::read_from_name(&conn, community_name)?;
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let community_url = community.get_url();
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let posts = PostQueryBuilder::create(&conn)
.listing_type(ListingType::All)
.sort(sort_type)
.for_community_id(community.id)
.list()?;
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let items = create_post_items(posts);
let mut channel_builder = ChannelBuilder::default();
channel_builder
.title(&format!("{} - {}", site_view.name, community.name))
.link(community_url)
.items(items);
if let Some(community_desc) = community.description {
channel_builder.description(&community_desc);
}
Ok(channel_builder)
}
fn get_feed_front(
conn: &PgConnection,
sort_type: &SortType,
jwt: String,
) -> Result<ChannelBuilder, Error> {
let site_view = SiteView::read(&conn)?;
let user_id = Claims::decode(&jwt)?.claims.id;
let posts = PostQueryBuilder::create(&conn)
.listing_type(ListingType::Subscribed)
.sort(sort_type)
.my_user_id(user_id)
.list()?;
let items = create_post_items(posts);
let mut channel_builder = ChannelBuilder::default();
channel_builder
.title(&format!("{} - Subscribed", site_view.name))
.link(format!("https://{}", Settings::get().hostname))
.items(items);
if let Some(site_desc) = site_view.description {
channel_builder.description(&site_desc);
}
Ok(channel_builder)
}
fn get_feed_inbox(conn: &PgConnection, jwt: String) -> Result<ChannelBuilder, Error> {
let site_view = SiteView::read(&conn)?;
let user_id = Claims::decode(&jwt)?.claims.id;
let sort = SortType::New;
let replies = ReplyQueryBuilder::create(&conn, user_id)
.sort(&sort)
.list()?;
let mentions = UserMentionQueryBuilder::create(&conn, user_id)
.sort(&sort)
.list()?;
let items = create_reply_and_mention_items(replies, mentions);
let mut channel_builder = ChannelBuilder::default();
channel_builder
.title(&format!("{} - Inbox", site_view.name))
.link(format!("https://{}/inbox", Settings::get().hostname))
.items(items);
if let Some(site_desc) = site_view.description {
channel_builder.description(&site_desc);
}
Ok(channel_builder)
}
fn create_reply_and_mention_items(
replies: Vec<ReplyView>,
mentions: Vec<UserMentionView>,
) -> Vec<Item> {
let mut reply_items: Vec<Item> = replies
.iter()
.map(|r| {
let reply_url = format!(
"https://{}/post/{}/comment/{}",
Settings::get().hostname,
r.post_id,
r.id
);
build_item(&r.creator_name, &r.published, &reply_url, &r.content)
})
.collect();
let mut mention_items: Vec<Item> = mentions
.iter()
.map(|m| {
let mention_url = format!(
"https://{}/post/{}/comment/{}",
Settings::get().hostname,
m.post_id,
m.id
);
build_item(&m.creator_name, &m.published, &mention_url, &m.content)
})
.collect();
reply_items.append(&mut mention_items);
reply_items
}
fn build_item(creator_name: &str, published: &NaiveDateTime, url: &str, content: &str) -> Item {
let mut i = ItemBuilder::default();
i.title(format!("Reply from {}", creator_name));
let author_url = format!("https://{}/u/{}", Settings::get().hostname, creator_name);
i.author(format!(
"/u/{} <a href=\"{}\">(link)</a>",
creator_name, author_url
));
let dt = DateTime::<Utc>::from_utc(*published, Utc);
i.pub_date(dt.to_rfc2822());
i.comments(url.to_owned());
let guid = GuidBuilder::default().permalink(true).value(url).build();
i.guid(guid.unwrap());
i.link(url.to_owned());
// TODO add images
let html = markdown_to_html(&content.to_string());
i.description(html);
i.build().unwrap()
}
fn create_post_items(posts: Vec<PostView>) -> Vec<Item> {
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let mut items: Vec<Item> = Vec::new();
for p in posts {
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let mut i = ItemBuilder::default();
i.title(p.name);
let author_url = format!("https://{}/u/{}", Settings::get().hostname, p.creator_name);
i.author(format!(
"/u/{} <a href=\"{}\">(link)</a>",
p.creator_name, author_url
));
let dt = DateTime::<Utc>::from_utc(p.published, Utc);
i.pub_date(dt.to_rfc2822());
let post_url = format!("https://{}/post/{}", Settings::get().hostname, p.id);
i.comments(post_url.to_owned());
let guid = GuidBuilder::default()
.permalink(true)
.value(&post_url)
.build();
i.guid(guid.unwrap());
let community_url = format!(
"https://{}/c/{}",
Settings::get().hostname,
p.community_name
);
let category = CategoryBuilder::default()
.name(format!(
"/c/{} <a href=\"{}\">(link)</a>",
p.community_name, community_url
))
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.domain(Settings::get().hostname.to_owned())
.build();
i.categories(vec![category.unwrap()]);
if let Some(url) = p.url {
i.link(url);
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}
// TODO add images
let mut description = format!("submitted by <a href=\"{}\">{}</a> to <a href=\"{}\">{}</a><br>{} points | <a href=\"{}\">{} comments</a>",
author_url,
p.creator_name,
community_url,
p.community_name,
p.score,
post_url,
p.number_of_comments);
if let Some(body) = p.body {
let html = markdown_to_html(&body);
description.push_str(&html);
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}
i.description(description);
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items.push(i.build().unwrap());
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}
items
}