commit b00cf3dfea3f366073061621c1f4495bfec4340f
Author: Sijmen <me@sijman.nl>
Date:   Fri Nov 18 10:03:21 2022 +0000

    Initial commit

diff --git a/.gitignore b/.gitignore
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index 0000000..4fe9b98
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..34b8041
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "rooster"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+reqwest = { version = "0.11.13", default-features = false, features = ["rustls-tls"] }
+icalendar = { version = "0.13.3", features = ["parser"] }
+rocket = "0.5.0-rc.2"
+chrono = "0.4.23"
+url = "2.3.1"
+
+[profile.release]
+lto = "thin"
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..3c369bb
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,16 @@
+FROM rust:1 AS builder
+WORKDIR /usr/src/rooster
+
+COPY Cargo.toml Cargo.lock ./
+COPY src ./src
+
+RUN cargo install --path .
+
+FROM debian:buster-slim
+
+ENV ROCKET_ADDRESS=0.0.0.0
+EXPOSE 8000
+
+COPY --from=builder /usr/local/cargo/bin/rooster /usr/local/bin/rooster
+
+CMD ["rooster"]
diff --git a/docker-compose.dist.yml b/docker-compose.dist.yml
new file mode 100644
index 0000000..0995629
--- /dev/null
+++ b/docker-compose.dist.yml
@@ -0,0 +1,8 @@
+version: "3"
+services:
+  app:
+    build: .
+    environment:
+      BASE_URL: http://localhost:8000
+    ports:
+      - 8000:8000
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..cea9933
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,115 @@
+use icalendar::{Calendar, Component, Event};
+use rocket::response::content::RawHtml;
+use rocket::{get, launch, routes};
+use std::collections::hash_map::DefaultHasher;
+use std::hash::{Hash, Hasher};
+use url::Url;
+
+#[get("/")]
+fn index() -> RawHtml<&'static str> {
+    RawHtml(
+        r#"
+<!DOCTYPE html>
+<html>
+    <body>
+        <form action="/url">
+            <label for="url">iCal URL:</label>
+            <input type="text" name="rooster_url" id="url" style="width: 500px" placeholder="https://rooster.utwente.nl/ical?...">
+            <input type="submit">
+        </form>
+    </body>
+</html>
+        "#,
+    )
+}
+
+#[get("/url?<rooster_url>")]
+async fn generate_url(rooster_url: &str) -> String {
+    let mut url = Url::parse(&std::env::var("BASE_URL").unwrap()).unwrap();
+
+    url.set_path("ical");
+
+    url.query_pairs_mut()
+        .clear()
+        .append_pair("url", rooster_url);
+
+    url.to_string()
+}
+
+enum Source {
+    Twente,
+    Delft,
+}
+
+#[get("/ical?<url>")]
+async fn ics(url: &str) -> String {
+    let source = if url.starts_with("https://rooster.utwente.nl/ical") {
+        Source::Twente
+    } else if url.starts_with("https://mytimetable.tudelft.nl/ical") {
+        Source::Delft
+    } else {
+        return "Must be a rooster.utwente.nl URL".to_string();
+    };
+
+    let body = reqwest::get(url).await.unwrap().text().await.unwrap();
+
+    let calendar = body.parse::<Calendar>().unwrap();
+    let mut new_calendar = Calendar::new();
+
+    for component in calendar.iter() {
+        let event = match component.as_event() {
+            Some(event) => event,
+            None => continue,
+        };
+
+        let summary = event.get_summary().unwrap();
+        let subject = match source {
+            Source::Twente => {
+                let (subject, _) = summary.rsplit_once(' ').unwrap();
+                subject
+            }
+
+            Source::Delft => {
+                let (_, subject) = summary.split_once(" - ").unwrap();
+                subject
+            }
+        };
+
+        let description = event.get_description().unwrap();
+        let (kind, _) = description.split_once("\\n").unwrap();
+        let (_, kind) = kind.split_once(": ").unwrap();
+
+        let start = event.get_start().unwrap();
+        let end = event.get_end().unwrap();
+
+        let mut hasher = DefaultHasher::new();
+        url.hash(&mut hasher);
+        format!("{start:?}").hash(&mut hasher);
+        format!("{end:?}").hash(&mut hasher);
+        summary.hash(&mut hasher);
+        description.hash(&mut hasher);
+        let mut new_event = Event::new();
+
+        new_event
+            .summary(&format!("{kind} {subject}"))
+            .description(description)
+            .starts(start)
+            .ends(end);
+        if let Some(location) = event.get_location() {
+            new_event.location(location);
+            location.hash(&mut hasher);
+        }
+
+        let hash = hasher.finish();
+        new_event.uid(&format!("{:x}", hash));
+
+        new_calendar.push(new_event.done());
+    }
+
+    new_calendar.to_string()
+}
+
+#[launch]
+fn rocket() -> _ {
+    rocket::build().mount("/", routes![index, generate_url, ics])
+}