use std::collections::BTreeMap;
use config;
use tokio;
use rss;
use chrono::DateTime;
use regex::Regex;
use tokio::stream::StreamExt;
use telegram_bot::*;
use sqlx::postgres::PgPoolOptions;
use sqlx::Row;
type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
#[derive(Clone)]
struct Core {
owner: i64,
api_key: String,
owner_chat: UserId,
tg: telegram_bot::Api,
my: User,
pool: sqlx::Pool<sqlx::Postgres>,
}
impl Core {
async fn new(settings: config::Config) -> Result<Core> {
let owner = settings.get_int("owner")?;
let api_key = settings.get_str("api_key")?;
let tg = Api::new(&api_key);
let core = Core {
owner: owner,
api_key: api_key.clone(),
my: tg.send(telegram_bot::GetMe).await?,
tg: tg,
owner_chat: UserId::new(owner),
pool: PgPoolOptions::new().max_connections(5).connect(&settings.get_str("pg")?).await?,
};
let clone = core.clone();
tokio::spawn(async move {
if let Err(err) = clone.autofetch().await {
eprintln!("connection error: {}", err);
}
});
Ok(core)
}
fn stream(&self) -> telegram_bot::UpdatesStream {
self.tg.stream()
}
fn debug(&self, msg: &str) -> Result<()> {
self.tg.spawn(SendMessage::new(self.owner_chat, msg));
Ok(())
}
async fn check(&self, id: &i32, real: Option<bool>) -> Result<()> {
match sqlx::query("select source_id, channel_id, url, iv_hash, owner from rsstg_source where source_id = $1")
.bind(id)
.fetch_one(&self.pool).await {
Ok(row) => {
let channel_id: i64 = row.try_get("channel_id")?;
let destination = match real {
Some(true) => UserId::new(channel_id),
Some(false) | None => UserId::new(row.try_get("owner")?),
};
let url: &str = row.try_get("url")?;
let mut this_fetch: Option<DateTime<chrono::FixedOffset>> = None;
let iv_hash: Option<&str> = row.try_get("iv_hash")?;
let mut posts: BTreeMap<DateTime<chrono::FixedOffset>, String> = BTreeMap::new();
match rss::Channel::from_url(url) {
Ok(feed) => {
for item in feed.items() {
let date = match item.pub_date() {
Some(feed_date) => DateTime::parse_from_rfc2822(feed_date),
None => DateTime::parse_from_rfc3339(&item.dublin_core_ext().unwrap().dates()[0]),
}?;
let url = item.link().unwrap().to_string();
posts.insert(date.clone(), url.clone());
};
for (date, url) in posts.iter() {
match sqlx::query("select exists(select true from rsstg_post where url = $1 and source_id = $2) as exists;")
.bind(&url)
.bind(id)
.fetch_one(&self.pool).await {
Ok(row) => {
let exists: bool = row.try_get("exists")?;
if ! exists {
if this_fetch == None || *date > this_fetch.unwrap() {
this_fetch = Some(*date);
}
match self.tg.send( match iv_hash {
Some(x) => SendMessage::new(destination, format!("<a href=\"https://t.me/iv?url={}&rhash={}\"> </a>{0}", url, x)),
None => SendMessage::new(destination, format!("{}", url)),
}.parse_mode(types::ParseMode::Html)).await {
Ok(_) => {
match sqlx::query("insert into rsstg_post (source_id, posted, url) values ($1, $2, $3);")
.bind(id)
.bind(date)
.bind(url)
.execute(&self.pool).await {
Ok(_) => {},
Err(err) => {
self.debug(&err.to_string())?;
},
};
},
Err(err) => {
self.debug(&err.to_string())?;
},
};
tokio::time::delay_for(std::time::Duration::new(4, 0)).await;
}
},
Err(err) => {
self.debug(&err.to_string())?;
},
};
};
posts.clear();
},
Err(err) => {
self.debug(&format!("Problem opening feed url:\n{}\n{}", &url, &err.to_string()))?;
},
};
match sqlx::query("update rsstg_source set last_scrape = now() where source_id = $1;")
.bind(id)
.execute(&self.pool).await {
Ok(_) => {},
Err(err) => {
self.debug(&err.to_string())?;
},
};
},
Err(err) => {
self.debug(&err.to_string())?;
},
};
Ok(())
}
async fn clean(&self, source_id: i32) -> Result<()> {
match sqlx::query("delete from rsstg_post where source_id = $1;")
.bind(source_id)
.execute(&self.pool).await {
Ok(_) => {},
Err(err) => {
self.debug(&err.to_string())?;
},
};
Ok(())
}
async fn enable(&self, source_id: &i32) -> Result<()> {
match sqlx::query("update rsstg_source set enabled = true where source_id = $1")
.bind(source_id)
.execute(&self.pool).await {
Ok(_) => {},
Err(err) => {
self.debug(&err.to_string())?;
},
}
Ok(())
}
async fn disable(&self, source_id: &i32) -> Result<()> {
match sqlx::query("update rsstg_source set enabled = false where source_id = $1")
.bind(source_id)
.execute(&self.pool).await {
Ok(_) => {},
Err(err) => {
self.debug(&err.to_string())?;
},
}
Ok(())
}
async fn autofetch(&self) -> Result<()> {
let mut delay = chrono::Duration::minutes(5);
let mut next_fetch: DateTime<chrono::Local>;
let mut now;
loop {
now = chrono::Local::now();
let mut rows = sqlx::query("select source_id, next_fetch from rsstg_order natural left join rsstg_source natural left join rsstg_channel where next_fetch < now();")
.fetch(&self.pool);
while let Some(row) = rows.try_next().await.unwrap() {
let source_id: i32 = row.try_get("source_id")?;
next_fetch = row.try_get("next_fetch")?;
if next_fetch < now {
match sqlx::query("update rsstg_source set last_scrape = now() + interval '1 hour' where source_id = $1;")
.bind(source_id)
.execute(&self.pool).await {
Ok(_) => {},
Err(err) => {
self.debug(&err.to_string())?;
},
};
let clone = self.clone();
tokio::spawn(async move {
if let Err(err) = clone.check(&source_id.clone(), Some(true)).await {
eprintln!("connection error: {}", err);
}
});
} else {
if next_fetch - now < delay {
delay = next_fetch - now;
}
}
};
tokio::time::delay_for(delay.to_std()?).await;
delay = chrono::Duration::minutes(5);
}
//Ok(())
}
}
#[tokio::main]
async fn main() -> Result<()> {
let mut settings = config::Config::default();
settings.merge(config::File::with_name("rsstg"))?;
let re_username = Regex::new(r"^@[a-zA-Z][a-zA-Z0-9_]+$")?;
let re_link = Regex::new(r"^https?://[a-zA-Z.0-9-]+/[-_a-zA-Z.0-9/?=]+$")?;
let re_iv_hash = Regex::new(r"^[a-f0-9]{14}$")?;
let core = Core::new(settings).await?;
let mut stream = core.stream();
while let Some(update) = stream.next().await {
match update {
Ok(update) => {
match update.kind {
UpdateKind::Message(message) => {
let mut reply: Vec<String> = vec![];
match message.kind {
MessageKind::Text { ref data, .. } => {
let mut words = data.split_whitespace();
let cmd = words.next().unwrap();
match cmd {
// start
"/start" => {
reply.push("We are open\\. Probably\\. Visit [channel](https://t.me/rsstg_bot_help/3) for details\\.".to_string());
},
// list
"/list" => {
reply.push("Channels:".to_string());
let mut rows = sqlx::query("select source_id, username, enabled, url, iv_hash from rsstg_source left join rsstg_channel using (channel_id) where owner = $1 order by source_id")
.bind(i64::from(message.from.id))
.fetch(&core.pool);
while let Some(row) = rows.try_next().await? {
let source_id: i32 = row.try_get("source_id")?;
let username: &str = row.try_get("username")?;
let enabled: bool = row.try_get("enabled")?;
let url: &str = row.try_get("url")?;
let iv_hash: Option<&str> = row.try_get("iv_hash")?;
reply.push(format!("\n\\#️⃣ {} \\*️⃣ `{}` {}\n🔗 `{}`", source_id, username,
match enabled {
true => "🔄 enabled",
false => "⛔ disabled",
}, url));
if let Some(hash) = iv_hash {
reply.push(format!("IV `{}`", hash));
}
}
},
// add
"/add" | "/update" => {
let mut source_id: i32 = 0;
if cmd == "/update" {
source_id = words.next().unwrap().parse::<i32>()?;
}
let (channel, url, iv_hash) = (words.next().unwrap(), words.next().unwrap(), words.next());
let ok_link = re_link.is_match(&url);
let ok_hash = match iv_hash {
Some(hash) => re_iv_hash.is_match(&hash),
None => true,
};
if ! ok_link {
reply.push("Link should be link to atom/rss feed, something like \"https://domain/path\"\\.".to_string());
core.debug(&format!("Url: {:?}", &url))?;
}
if ! ok_hash {
reply.push("IV hash should be 14 hex digits.".to_string());
core.debug(&format!("IV: {:?}", &iv_hash))?;
}
if ok_link && ok_hash {
let chan: Option<i64> = match sqlx::query("select channel_id from rsstg_channel where username = $1")
.bind(channel)
.fetch_one(&core.pool).await {
Ok(chan) => Some(chan.try_get("channel_id")?),
Err(sqlx::Error::RowNotFound) => {
reply.push("Sorry, I don't know about that channel. Please, add a channel with /addchan.".to_string());
None
},
Err(err) => {
reply.push("Sorry, unknown error\\.".to_string());
core.debug(&format!("Sorry, unknown error: {:#?}\n", err))?;
None
},
};
if let Some(chan) = chan {
match if cmd == "/update" {
sqlx::query("update rsstg_source set channel_id = $2, url = $3, iv_hash = $4, owner = $4 where source_id = $1").bind(source_id)
} else {
sqlx::query("insert into rsstg_source (channel_id, url, iv_hash, owner) values ($1, $2, $3, $4)")
}
.bind(chan)
.bind(url)
.bind(iv_hash)
.bind(i64::from(message.from.id))
.execute(&core.pool).await {
Ok(_) => reply.push("Channel added\\.".to_string()),
Err(sqlx::Error::Database(err)) => {
match err.downcast::<sqlx::postgres::PgDatabaseError>().routine() {
Some("_bt_check_unique", ) => {
reply.push("Duplicate key\\.".to_string());
},
Some(_) => {
reply.push("Database error\\.".to_string());
},
None => {
reply.push("No database error extracted\\.".to_string());
},
};
},
Err(err) => {
reply.push("Sorry, unknown error\\.".to_string());
core.debug(&format!("Sorry, unknown error: {:#?}\n", err))?;
},
};
};
};
},
// addchan
"/addchan" => {
let channel = words.next().unwrap();
if ! re_username.is_match(&channel) {
reply.push("Usernames should be something like \"@\\[a\\-zA\\-Z]\\[a\\-zA\\-Z0\\-9\\_]+\", aren't they?".to_string());
} else {
let chan: Option<i64> = match sqlx::query("select channel_id from rsstg_channel where username = $1")
.bind(channel)
.fetch_one(&core.pool).await {
Ok(chan) => Some(chan.try_get("channel_id")?),
Err(sqlx::Error::RowNotFound) => None,
Err(err) => {
reply.push("Sorry, unknown error\\.".to_string());
core.debug(&format!("Sorry, unknown error: {:#?}\n", err))?;
None
},
};
match chan {
Some(chan) => {
let new_chan = core.tg.send(telegram_bot::GetChat::new(telegram_bot::types::ChatId::new(chan))).await?;
if i64::from(new_chan.id()) == chan {
reply.push("I already know that channel\\.".to_string());
} else {
reply.push("Hmm, channel has changed… I'll fix it later\\.".to_string());
};
},
None => {
match core.tg.send(telegram_bot::GetChatAdministrators::new(telegram_bot::types::ChatRef::ChannelUsername(channel.to_string()))).await {
Ok(chan_adm) => {
let (mut me, mut user) = (false, false);
for admin in &chan_adm {
if admin.user.id == core.my.id {
me = true;
};
if admin.user.id == message.from.id {
user = true;
};
};
if ! me { reply.push("I need to be admin on that channel\\.".to_string()); };
if ! user { reply.push("You should be admin on that channel\\.".to_string()); };
if me && user {
let chan_id = core.tg.send(telegram_bot::GetChat::new(telegram_bot::types::ChatRef::ChannelUsername(channel.to_string()))).await?;
sqlx::query("insert into rsstg_channel (channel_id, username) values ($1, $2);")
.bind(i64::from(chan_id.id()))
.bind(channel)
.execute(&core.pool).await?;
reply.push("Good, I know that channel now\\.\n".to_string());
};
},
Err(_) => {
reply.push("Sorry, I have no access to that chat\\.".to_string());
},
};
},
};
};
},
// check
"/check" => {
&core.check(&words.next().unwrap().parse::<i32>()?, None).await?;
},
// clean
"/clean" => {
if core.owner != i64::from(message.from.id) {
reply.push("Reserved for testing\\.".to_string());
} else {
let source_id = words.next().unwrap().parse::<i32>().unwrap_or(0);
&core.clean(source_id).await?;
}
},
// enable
"/enable" => {
match core.enable(&words.next().unwrap().parse::<i32>()?).await {
Ok(_) => {
reply.push("Channel enabled\\.".to_string());
}
Err(err) => {
core.debug(&err.to_string())?;
},
};
},
// disable
"/disable" => {
match core.disable(&words.next().unwrap().parse::<i32>()?).await {
Ok(_) => {
reply.push("Channel disabled\\.".to_string());
}
Err(err) => {
core.debug(&err.to_string())?;
},
};
},
_ => {
},
};
},
_ => {
},
};
if reply.len() > 0 {
match core.tg.send(message.text_reply(reply.join("\n")).parse_mode(types::ParseMode::MarkdownV2)).await {
Ok(_) => {},
Err(err) => {
dbg!(reply.join("\n"));
println!("{}", err);
},
}
}
},
_ => {},
};
},
Err(err) => {
core.debug(&err.to_string())?;
},
};
}
Ok(())
}