tron/src/main.rs

use anyhow::Result;
use async_trait::async_trait;
use discord_webhook::Body;
use furbooru::{Client, Comment, FirehoseAdaptor, Forum, Image, Post, Topic};
use regex::Regex;
use serde::Deserialize;
use std::{fmt, path::PathBuf};

#[derive(Deserialize, Debug, Clone)]
pub(crate) struct Config {
    discord_webhook_url: String,
    furbooru_api_key: String,
    bot_owner_furbooru_account: String,
    regexes: PathBuf,
}

impl Config {}

#[derive(Deserialize, Debug, Clone)]
pub(crate) struct Rule {
    regex: String,
    why: String,
}

struct CompiledRule {
    regex: Regex,
    raw: String,
    why: String,
}

pub(crate) fn user_agent(username: String) -> String {
    format!(
        "{}/{} ({}, +{})",
        env!("CARGO_PKG_NAME"),
        env!("CARGO_PKG_VERSION"),
        username,
        env!("CARGO_PKG_REPOSITORY")
    )
}

struct Hit {
    matches: String,
    why: String,
}

impl fmt::Display for Hit {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "- match on rule `{}` ({})", self.matches, self.why)
    }
}

struct Rules(Vec<CompiledRule>, Config);

impl Rules {
    fn check(&self, text: &String) -> Option<Vec<Hit>> {
        let mut result: Vec<Hit> = vec![];
        let mut found = false;

        for rule in &self.0 {
            if rule.regex.is_match(text) {
                log::debug!("{:?} matches {}", text, rule.raw);
                found = true;
                result.push(Hit {
                    matches: rule.raw.clone(),
                    why: rule.why.clone(),
                });
            }
        }

        if found {
            Some(result)
        } else {
            None
        }
    }
}

#[async_trait]
impl FirehoseAdaptor for Rules {
    async fn image_created(&self, img: Image) -> Result<()> {
        let url = format!("https://furbooru.org/{}", img.id);
        log::debug!("got image {}", url);
        if let Some(hits) = self.check(&img.description.to_lowercase()) {
            let mut buf: String = String::new();

            for hit in hits {
                buf.push_str(&format!("\n{}", hit));
            }
            discord_webhook::execute(
                self.1.discord_webhook_url.clone(),
                Body::new(format!(
                    "matches from **{}** found on <{}>:{}",
                    img.uploader.or(Some("An anonymous user".into())).unwrap(),
                    url,
                    buf
                )),
            )
            .await?;
            log::info!("the description of {} has naughty words", url);
        }

        Ok(())
    }

    async fn comment_created(&self, cmt: Comment) -> Result<()> {
        let url = format!("https://furbooru.org/{}#comment_{}", cmt.image_id, cmt.id);
        log::debug!("got comment {}", url);
        if let Some(hits) = self.check(&cmt.body.to_lowercase()) {
            let mut buf: String = String::new();

            for hit in hits {
                buf.push_str(&format!("\n{}", hit));
            }
            discord_webhook::execute(
                self.1.discord_webhook_url.clone(),
                Body::new(format!(
                    "matches from **{}** found on <{}>:{}",
                    cmt.author, url, buf
                )),
            )
            .await?;
            log::info!("comment {} has naughty words", url);
        }

        Ok(())
    }

    async fn post_created(&self, frm: Forum, top: Topic, pst: Post) -> Result<()> {
        let url = format!(
            "https://furbooru.org/forums/{forum}/topics/{topic}?post_id={post}#post_{post}",
            forum = frm.short_name,
            topic = top.slug,
            post = pst.id
        );
        log::debug!("got post {}", url);

        if let Some(hits) = self.check(&pst.body.to_lowercase()) {
            let mut buf: String = String::new();

            for hit in hits {
                buf.push_str(&format!("\n{}", hit));
            }
            discord_webhook::execute(
                self.1.discord_webhook_url.clone(),
                Body::new(format!(
                    "matches from **{}** found on <{}>:{}",
                    pst.author, url, buf
                )),
            )
            .await?;
            log::info!("post {} has naughty words", url);
        }

        Ok(())
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let _ = kankyo::init();
    pretty_env_logger::init();
    let cfg: Config = envy::from_env()?;
    log::debug!("cfg: {:?}", cfg);

    log::debug!("loaded list of words to watch");
    let rexes: Vec<Rule> = serde_dhall::from_file(cfg.regexes.clone()).parse()?;
    let mut compiled_rules: Vec<CompiledRule> = Vec::new();

    #[cfg(not(debug_assertions))]
    {
        discord_webhook::execute(
            cfg.discord_webhook_url.clone(),
            Body::new("I fight for the user!"),
        )
        .await?;
    }

    for rule in rexes {
        log::debug!("{} -> {}", rule.regex, rule.why);
        compiled_rules.push(CompiledRule {
            raw: rule.regex.clone(),
            regex: Regex::new(rule.regex.as_str())?,
            why: rule.why,
        })
    }

    let cli = Client::new(
        user_agent(cfg.bot_owner_furbooru_account.clone()),
        cfg.furbooru_api_key.clone(),
    )?;
    log::info!("listening on the firehose");
    cli.firehose(Rules(compiled_rules, cfg)).await?;

    Ok(())
}