commit d58ddadacdfbe5df6050c9ac89a0852f6715cfea
Author: Niklas Elsbrock <mail@nelsbrock.de>
Date:   Wed May 31 22:05:53 2023 +0200

    initial commit

diff --git a/.gitignore b/.gitignore
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+ "windows_x86_64_gnu 0.42.2",
+ "windows_x86_64_gnullvm 0.42.2",
+ "windows_x86_64_msvc 0.42.2",
+]
+
+[[package]]
+name = "windows-targets"
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+checksum = "7b1eb6f0cd7c80c79759c929114ef071b87354ce476d9d94271031c0497adfd5"
+dependencies = [
+ "windows_aarch64_gnullvm 0.48.0",
+ "windows_aarch64_msvc 0.48.0",
+ "windows_i686_gnu 0.48.0",
+ "windows_i686_msvc 0.48.0",
+ "windows_x86_64_gnu 0.48.0",
+ "windows_x86_64_gnullvm 0.48.0",
+ "windows_x86_64_msvc 0.48.0",
+]
+
+[[package]]
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+
+[[package]]
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+checksum = "b2ef27e0d7bdfcfc7b868b317c1d32c641a6fe4629c171b8928c7b08d98d7cf3"
+
+[[package]]
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+[[package]]
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+
+[[package]]
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+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4542c6e364ce21bf45d69fdd2a8e455fa38d316158cfd43b3ac1c5b1b19f8e00"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
+
+[[package]]
+name = "windows_x86_64_gnu"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
+
+[[package]]
+name = "winreg"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80d0f4e272c85def139476380b12f9ac60926689dd2e01d4923222f40580869d"
+dependencies = [
+ "winapi",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..215cce1
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "disbahn"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rss = "2.0"
+reqwest = {version = "0.11", default-features = false, features = ["rustls"]}
+tokio = {version = "1.28", features = ["rt-multi-thread", "signal"]}
+lazy-regex = "2.5.0"
+#time = {version = "0.3", features = ["local-offset" ,"macros", "parsing"]}
+chrono = "0.4.25"
+chrono-tz = "0.8.2"
+anyhow = "1.0.71"
+log = "0.4.18"
+env_logger = "0.10.0"
+dotenvy = "0.15.7"
+
+[dependencies.serenity]
+version = "0.11"
+default-features = false
+features = ["builder", "cache", "client", "gateway", "http", "model", "utils", "rustls_backend"]
\ No newline at end of file
diff --git a/src/hint.txt b/src/hint.txt
new file mode 100644
index 0000000..0e8726d
--- /dev/null
+++ b/src/hint.txt
@@ -0,0 +1 @@
+*Die aus dem RSS-Feed von zuginfo.nrw stammenden Beginn- und Endzeiten scheinen oft inakkurat zu sein und sind daher mit Vorsicht zu genießen.*
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..eae9cec
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,187 @@
+use anyhow::{anyhow, Context};
+use chrono::{DateTime, NaiveDateTime, TimeZone};
+use lazy_regex::regex;
+use log::{debug, error, info};
+use reqwest::IntoUrl;
+use rss::{Channel, Item};
+use serenity::http::Http;
+use serenity::json::Value;
+use serenity::model::channel::Embed;
+use serenity::model::prelude::Webhook;
+use std::collections::HashSet;
+use std::env;
+use std::fs::{File, OpenOptions};
+use std::io::{BufRead, BufReader, Write};
+use std::time::Duration;
+
+const REFRESH_INTERVAL: Duration = Duration::from_secs(10 * 60);
+
+async fn get_rss_channel<T: IntoUrl>(url: T) -> anyhow::Result<Channel> {
+    let content = reqwest::get(url).await?.bytes().await?;
+    let channel = Channel::read_from(&content[..])?;
+    Ok(channel)
+}
+
+fn validity_time_to_timestamp(input: &str) -> anyhow::Result<i64> {
+    let naive = NaiveDateTime::parse_from_str(input, "%Y-%m-%d %H:%M:%S")?;
+    let timestamp = chrono_tz::Europe::Berlin
+        .from_local_datetime(&naive)
+        .unwrap()
+        .timestamp();
+    Ok(timestamp)
+}
+
+fn html_to_discord_markdown(input: &str) -> String {
+    let re_times = regex!(r#"^.*<br/><br/>"#i);
+    let re_newline = regex!(r#"<br\s*/?>"#i);
+    let re_bold = regex!(r#"<b>(.*?)</b>"#i);
+    let re_italic = regex!(r#"<i>(.*?)</i>"#i);
+    let re_strikethrough = regex!(r#"<s>(.*?)</s>"#i);
+
+    let input = re_times.replace(input, "");
+    let input = re_newline.replace_all(&input, "\n");
+    let input = re_bold.replace_all(&input, "**$1**");
+    let input = re_italic.replace_all(&input, "*$1*");
+    let input = re_strikethrough.replace_all(&input, "~~$1~~");
+    input.to_string()
+}
+
+fn icon_name_to_url(name: &str) -> &str {
+    match name {
+        "HIM1" => "https://upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Zeichen_123_-_Arbeitsstelle%2C_StVO_2013.svg/273px-Zeichen_123_-_Arbeitsstelle%2C_StVO_2013.svg.png",
+        "HIM2" => "https://upload.wikimedia.org/wikipedia/commons/thumb/0/02/Zeichen_101_-_Gefahrstelle%2C_StVO_1970.svg/273px-Zeichen_101_-_Gefahrstelle%2C_StVO_1970.svg.png",
+        _ => "https://upload.wikimedia.org/wikipedia/commons/thumb/8/8a/RWB-RWBA_Information.svg/240px-RWB-RWBA_Information.svg.png",
+    }
+}
+
+fn item_to_embed(item: &Item) -> anyhow::Result<Value> {
+    const COLOUR: u32 = 0x008d4f;
+    const FOOTER_ICON_URL: &str = "https://www.zuginfo.nrw/img/customer/apple-touch-icon.png";
+
+    let categories = item.categories();
+
+    let title = item.title().ok_or(anyhow!("Missing title"))?;
+    let link = item.link().ok_or(anyhow!("Missing link"))?;
+
+    let validity_begin = &categories
+        .iter()
+        .find(|c| c.domain() == Some("validityBegin"))
+        .ok_or(anyhow!("Missing validityBegin category"))?
+        .name;
+    let validity_begin = validity_time_to_timestamp(validity_begin)?;
+
+    let validity_end = &categories
+        .iter()
+        .find(|c| c.domain() == Some("validityEnd"))
+        .ok_or(anyhow!("Missing validityEnd category"))?
+        .name;
+    let validity_end = validity_time_to_timestamp(validity_end)?;
+
+    let icon = categories
+        .iter()
+        .find(|c| c.domain() == Some("icon"))
+        .map(|c| c.name())
+        .unwrap_or("");
+    let icon_url = icon_name_to_url(icon);
+
+    let description =
+        html_to_discord_markdown(item.description().ok_or(anyhow!("Missing description"))?);
+
+    let pub_date = item.pub_date().ok_or(anyhow!("Missing publication date"))?;
+    let pub_timestamp = DateTime::parse_from_rfc2822(pub_date)
+        .with_context(|| format!("Unable to parse publication date string {pub_date:?}"))?
+        .naive_utc()
+        .and_utc()
+        .to_rfc3339_opts(chrono::SecondsFormat::Secs, true);
+
+    let embed = Embed::fake(|e| {
+        e.title(title)
+            .url(link)
+            .thumbnail(icon_url)
+            .colour(COLOUR)
+            .description(description)
+            .field("Beginn:", format!("<t:{}:F>", validity_begin), true)
+            .field("Ende:", format!("<t:{}:F>", validity_end), true)
+            .field("Hinweis:", include_str!("hint.txt"), false)
+            .timestamp(pub_timestamp)
+            .footer(|f| {
+                f.text("Quelle: https://zuginfo.nrw/ \u{2013} Alle Angaben ohne Gewehr \u{1F52B}")
+                    .icon_url(FOOTER_ICON_URL)
+            })
+    });
+
+    Ok(embed)
+}
+
+async fn refresh_and_process_rss(
+    feed_url: &str,
+    http: &Http,
+    webhook: &Webhook,
+    known_guids: &mut HashSet<String>,
+    known_guids_file: &mut File,
+) -> anyhow::Result<()> {
+    debug!("Refreshing RSS feed ...");
+    let channel = get_rss_channel(feed_url)
+        .await
+        .map_err(|e| anyhow!(e.to_string()))
+        .with_context(|| "Failed to get RSS channel")?;
+    for item in channel.items() {
+        let guid = item.guid().ok_or(anyhow!("Missing GUID"))?.value();
+        if !known_guids.contains(guid) {
+            info!("New item: {}", guid);
+            known_guids.insert(guid.to_owned());
+            writeln!(known_guids_file, "{}", guid).with_context(|| "Failed to write known GUID")?;
+            let embed = item_to_embed(item)?;
+            webhook
+                .execute(&http, false, |w| w.embeds(vec![embed]))
+                .await
+                .with_context(|| "Failed to execute webhook")?;
+        }
+    }
+    debug!("Done.");
+    Ok(())
+}
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    dotenvy::dotenv()?;
+
+    env_logger::builder()
+        .filter_module(module_path!(), log::LevelFilter::Debug)
+        .init();
+
+    let webhook_url = env::var("WEBHOOK_URL")?;
+    let feed_url = env::var("FEED_URL")?;
+    let known_guids_file = env::var("KNOWN_GUIDS_FILE")?;
+
+    let mut known_guids_file = OpenOptions::new()
+        .read(true)
+        .write(true)
+        .create(true)
+        .open(known_guids_file)?;
+
+    let http = Http::new("");
+    let webhook = http.get_webhook_from_url(&webhook_url).await.unwrap();
+
+    let mut known_guids: HashSet<String> = HashSet::new();
+    for line in BufReader::new(&known_guids_file).lines() {
+        let line = line?;
+        known_guids.insert(line);
+    }
+
+    loop {
+        if let Err(err) = refresh_and_process_rss(
+            &feed_url,
+            &http,
+            &webhook,
+            &mut known_guids,
+            &mut known_guids_file,
+        )
+        .await
+        {
+            error!("Error: {}", err);
+        }
+
+        tokio::time::sleep(REFRESH_INTERVAL).await;
+    }
+}