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Diffstat (limited to 'users/tazjin/tgsa')
-rw-r--r-- | users/tazjin/tgsa/.gitignore | 3 | ||||
-rw-r--r-- | users/tazjin/tgsa/Cargo.lock | 1296 | ||||
-rw-r--r-- | users/tazjin/tgsa/Cargo.toml | 12 | ||||
-rw-r--r-- | users/tazjin/tgsa/default.nix | 10 | ||||
-rw-r--r-- | users/tazjin/tgsa/src/main.rs | 343 |
5 files changed, 1664 insertions, 0 deletions
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000000000000..ef8842ea26be --- /dev/null +++ b/users/tazjin/tgsa/default.nix @@ -0,0 +1,10 @@ +{ depot, pkgs, ... }: + +depot.third_party.naersk.buildPackage { + src = ./.; + + buildInputs = with pkgs; [ + pkgconfig + openssl + ]; +} diff --git a/users/tazjin/tgsa/src/main.rs b/users/tazjin/tgsa/src/main.rs new file mode 100644 index 000000000000..ed72569f9204 --- /dev/null +++ b/users/tazjin/tgsa/src/main.rs @@ -0,0 +1,343 @@ +use anyhow::{anyhow, Context, Result}; +use std::collections::HashMap; +use std::sync::RwLock; +use std::time::{Duration, Instant}; + +#[derive(Clone, Debug, Eq, Hash, PartialEq)] +struct TgLink { + username: String, + message_id: usize, +} + +impl TgLink { + fn human_friendly_url(&self) -> String { + format!("t.me/{}/{}", self.username, self.message_id) + } + + fn to_url(&self) -> String { + format!("https://t.me/{}/{}?embed=1", self.username, self.message_id) + } + + fn parse(url: &str) -> Option<Self> { + let url = url.strip_prefix("/")?; + let parsed = url::Url::parse(url).ok()?; + + if parsed.host()? != url::Host::Domain("t.me") { + // only t.me links are supported + return None; + } + + let parts = parsed.path_segments()?.collect::<Vec<&str>>(); + if parts.len() != 2 { + // only message links are supported + return None; + } + + Some(TgLink { + username: parts[0].into(), + message_id: parts[1].parse().ok()?, + }) + } +} + +fn fetch_embed(link: &TgLink) -> Result<String> { + println!("fetching {}#{}", link.username, link.message_id); + let response = crimp::Request::get(&link.to_url()) + .send() + .context("failed to fetch embed data")? + .as_string() + .context("failed to decode embed data")? + .error_for_status(|resp| { + anyhow!("telegram request failed: {} ({})", resp.body, resp.status) + })?; + + Ok(response.body) +} + +#[derive(Debug)] +struct TgMessage { + author: String, + message: Option<String>, + photos: Vec<String>, + videos: Vec<String>, + has_audio: bool, +} + +fn extract_photo_url(style: &str) -> Option<&str> { + let url_start = style.find("url('")? + 5; + let url_end = style.find("')")?; + + Some(&style[url_start..url_end]) +} + +fn parse_tgmessage(embed: &str) -> Result<TgMessage> { + use scraper::{Html, Selector}; + + let doc = Html::parse_document(embed); + + let author_sel = Selector::parse("a.tgme_widget_message_owner_name").unwrap(); + let author = doc + .select(&author_sel) + .next() + .ok_or_else(|| anyhow!("failed to find message author"))? + .text() + .collect::<Vec<&str>>() + .concat(); + + let msg_sel = Selector::parse("div.tgme_widget_message_text.js-message_text").unwrap(); + + // The ElementRef::text() iterator does not yield newlines present + // in the message, so it is partially reimplemented here. + let message = if let Some(msg_elem) = doc.select(&msg_sel).next() { + use ego_tree::iter::Edge; + use scraper::node::Node; + + let mut out = String::new(); + + for edge in &mut msg_elem.traverse() { + if let Edge::Open(node) = edge { + match node.value() { + Node::Text(ref text) => out.push_str(&*text), + Node::Element(elem) if elem.name() == "br" => out.push_str("\n"), + _ => {} + } + } + } + + Some(out) + } else { + // Not all Telegram messages have a textual message. + None + }; + + let photo_sel = Selector::parse("a.tgme_widget_message_photo_wrap").unwrap(); + let mut photos = vec![]; + + for photo in doc.select(&photo_sel) { + if let Some(style) = photo.value().attr("style") { + if let Some(url) = extract_photo_url(style) { + photos.push(url.to_string()) + } + } + } + + let video_sel = Selector::parse("i.tgme_widget_message_video_thumb").unwrap(); + let mut videos = vec![]; + + for video in doc.select(&video_sel) { + if let Some(style) = video.value().attr("style") { + if let Some(url) = extract_photo_url(style) { + videos.push(url.to_string()) + } + } + } + + let audio_sel = Selector::parse("audio.tgme_widget_message_voice.js-message_voice").unwrap(); + let mut has_audio = false; + if doc.select(&audio_sel).next().is_some() { + has_audio = true; + } + + Ok(TgMessage { + author, + message, + photos, + videos, + has_audio, + }) +} + +// create a permanent media url that tgsa can redirect if telegram +// changes its upstream links. +// +// assumes that tgsa lives at tgsa.tazj.in (which it does) +fn media_url(link: &TgLink, idx: usize) -> String { + format!( + "https://tgsa.tazj.in/img/{}/{}/{}", + link.username, link.message_id, idx + ) +} + +fn to_bbcode(link: &TgLink, msg: &TgMessage) -> String { + let mut out = String::new(); + + out.push_str(&format!("[quote=\"{}\"]\n", msg.author)); + + for video in 0..msg.videos.len() { + out.push_str(&format!("[url=\"{}\"]", link.to_url())); + + // video thumbnail links are appended to the photos, hence the + // addition here + out.push_str(&format!( + "[img]{}[/img]", + media_url(link, video + msg.photos.len()) + )); + + out.push_str("[/url]\n"); + out.push_str("[sub](Click thumbnail to open video)[/sub]\n") + } + + for photo in 0..msg.photos.len() { + out.push_str(&format!("[timg]{}[/timg]\n", media_url(link, photo))); + } + + if msg.has_audio { + out.push_str(&format!( + "[i]This message has audio attached. Go [url=\"{}\"]to Telegram[/url] to listen.[/i]", + link.to_url(), + )); + } + + if let Some(message) = &msg.message { + out.push_str(message); + } + + out.push_str("\n[/quote]\n"); + + out.push_str(&format!( + "[sub](from [url=\"{}\"]{}[/url], via [url=\"https://tgsa.tazj.in\"]tgsa[/url])[/sub]\n", + link.to_url(), + link.human_friendly_url(), + )); + + out +} + +// cache everything for one hour +const CACHE_EXPIRY: Duration = Duration::from_secs(60 * 60); + +#[derive(Clone)] +struct TgPost { + bbcode: String, + at: Instant, + media: Vec<String>, +} + +type Cache = RwLock<HashMap<TgLink, TgPost>>; + +fn fetch_with_cache(cache: &Cache, link: &TgLink) -> Result<TgPost> { + if let Some(entry) = cache.read().unwrap().get(&link) { + if Instant::now() - entry.at < CACHE_EXPIRY { + println!("serving {}#{} from cache", link.username, link.message_id); + return Ok(entry.clone()); + } + } + + // limit concurrent fetching + // TODO(tazjin): per link? + let mut writer = cache.write().unwrap(); + + let embed = fetch_embed(&link)?; + let mut msg = parse_tgmessage(&embed)?; + let bbcode = to_bbcode(&link, &msg); + + let mut media = vec![]; + media.append(&mut msg.photos); + media.append(&mut msg.videos); + + let post = TgPost { + bbcode, + media, + at: Instant::now(), + }; + + writer.insert(link.clone(), post.clone()); + + Ok(post) +} + +fn handle_img_redirect(cache: &Cache, img_path: &str) -> Result<rouille::Response> { + // img_path: + // + // RWApodcast/113/1 + // ^ ^ ^ + // | | | + // | | image (0-indexed) + // | post ID + // username + + let img_parts: Vec<&str> = img_path.split("/").collect(); + + if img_parts.len() != 3 { + println!("invalid image link: {}", img_path); + return Err(anyhow!("not a valid image link: {}", img_path)); + } + + let link = TgLink { + username: img_parts[0].into(), + message_id: img_parts[1].parse().context("failed to parse message_id")?, + }; + + let img_idx: usize = img_parts[2].parse().context("failed to parse img_idx")?; + let post = fetch_with_cache(cache, &link)?; + + if img_idx >= post.media.len() { + return Err(anyhow!( + "there is no {}. image in {}/{}", + img_idx, + link.username, + link.message_id + )); + } + + Ok(rouille::Response::redirect_303(post.media[img_idx].clone())) +} + +fn handle_tg_link(cache: &Cache, link: &TgLink) -> Result<rouille::Response> { + let post = fetch_with_cache(cache, link)?; + Ok(rouille::Response::text(post.bbcode)) +} + +fn main() { + crimp::init(); + + let cache: Cache = RwLock::new(HashMap::new()); + + rouille::start_server("0.0.0.0:8472", move |request| { + let response = loop { + if request.raw_url().starts_with("/img/") { + break handle_img_redirect(&cache, &request.raw_url()[5..]); + } + + break match TgLink::parse(request.raw_url()) { + None => Ok(rouille::Response::text( + r#"tgsa +---- + +this is a stupid program that lets you turn telegram message links +into BBcode suitable for pasting on somethingawful dot com + +you can use it by putting a valid telegram message link in the url and +waiting for some bbcode to show up. + +for example: + + https://tgsa.tazj.in/https://t.me/RWApodcast/113 + +yes, that looks stupid, but it works + +if you see this message and think you did the above correctly, you +didn't. try again. idiot. + +pm me on the forums if this makes you mad or something. +"#, + )), + Some(link) => handle_tg_link(&cache, &link), + }; + }; + + match response { + Ok(resp) => resp, + Err(err) => { + println!("something failed: {}", err); + rouille::Response::text(format!( + r#"ugh, something broke: {} + +nobody has been alerted about this and it has probably not been +logged. pm me on the forums if you think it's important."#, + err + )) + } + } + }); +} |