Implemented calendar in Rust

3 files changed, 149 insertions, 3 deletions

diff --git a/.gitignore b/.gitignore
index ce73bef..0fcb377 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
 config.json
-# Created by https://www.toptal.com/developers/gitignore/api/linux,visualstudiocode
-# Edit at https://www.toptal.com/developers/gitignore?templates=linux,visualstudiocode
+# Created by https://www.toptal.com/developers/gitignore/api/rust,visualstudiocode,linux
+# Edit at https://www.toptal.com/developers/gitignore?templates=rust,visualstudiocode,linux
 
 ### Linux ###
 *~
@@ -17,6 +17,22 @@ config.json
 # .nfs files are created when an open file is removed but is still being accessed
 .nfs*
 
+### Rust ###
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
 ### VisualStudioCode ###
 .vscode/*
 !.vscode/settings.json
@@ -36,4 +52,4 @@ config.json
 .history
 .ionide
 
-# End of https://www.toptal.com/developers/gitignore/api/linux,visualstudiocode
\ No newline at end of file
+# End of https://www.toptal.com/developers/gitignore/api/rust,visualstudiocode,linux
\ No newline at end of file
diff --git a/calendar/Cargo.toml b/calendar/Cargo.toml
new file mode 100644
index 0000000..1ab2d69
--- /dev/null
+++ b/calendar/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "calendar"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+reqwest = { version = "0.11", features = ["blocking", "json"] }
+regex = "1.10"
+tempfile = "3.8"
+anyhow = "1.0"
\ No newline at end of file
diff --git a/calendar/src/main.rs b/calendar/src/main.rs
new file mode 100644
index 0000000..77271fd
--- /dev/null
+++ b/calendar/src/main.rs
@@ -0,0 +1,118 @@
+use std::{fs, io::Write, path::PathBuf};
+use serde::Deserialize;
+use regex::Regex;
+use tempfile::tempdir;
+use reqwest::blocking::Client;
+
+#[derive(Deserialize)]
+struct Config {
+    calendar: CalendarConfig,
+}
+
+#[derive(Deserialize)]
+struct CalendarConfig {
+    caldav_base_url: String,
+    caldav_username: String,
+    caldav_password: String,
+    calendars: Vec<CalendarEntry>,
+}
+
+#[derive(Deserialize)]
+struct CalendarEntry {
+    name: String,
+    ics: String,
+}
+
+fn main() -> anyhow::Result<()> {
+    let base_dir = "/home/leonard/Projects/scripts";
+    let config_path = format!("{}/config.json", base_dir);
+    let config_data = fs::read_to_string(&config_path)?;
+    let config: Config = serde_json::from_str(&config_data)?;
+
+    let tmp_dir = tempdir()?;
+    let client = Client::new();
+
+    for cal in &config.calendar.calendars {
+        println!("INFO: Lade ICS von: {}", cal.ics);
+        let ics_path = tmp_dir.path().join(format!("{}.ics", cal.name));
+        let response = client.get(&cal.ics).send()?;
+        if !response.status().is_success() {
+            eprintln!("WARNING: Fehler beim Herunterladen von {}", cal.ics);
+            continue;
+        }
+        let ics_content = response.text()?;
+        fs::write(&ics_path, &ics_content)?;
+
+        let caldav_url = format!("{}/{}", config.calendar.caldav_base_url.trim_end_matches('/'), cal.name);
+        println!("INFO: Zerlege Datei: {:?}", ics_path);
+
+        let vevent_blocks = split_vevents(&ics_content);
+        for vevent in vevent_blocks {
+            if let Some(uid) = extract_uid(&vevent) {
+                let safe_uid = sanitize_filename(&uid);
+                let event_path = tmp_dir.path().join(format!("{}.ics", safe_uid));
+                let mut event_file = fs::File::create(&event_path)?;
+
+                writeln!(event_file, "BEGIN:VCALENDAR")?;
+                writeln!(event_file, "VERSION:2.0")?;
+                writeln!(event_file, "PRODID:-//calendar script//EN")?;
+                writeln!(event_file, "{}", vevent.trim())?;
+                writeln!(event_file, "END:VCALENDAR")?;
+
+                println!("INFO: Lade UID={} → {}/{}.ics", safe_uid, caldav_url, safe_uid);
+                let put_url = format!("{}/{}.ics", caldav_url, safe_uid);
+
+                let body = fs::read(&event_path)?;
+                let put_response = client
+                    .put(&put_url)
+                    .basic_auth(&config.calendar.caldav_username, Some(&config.calendar.caldav_password))
+                    .header("Content-Type", "text/calendar; charset=utf-8")
+                    .body(body)
+                    .send()?;
+
+                println!("→ HTTP-Code: {}", put_response.status());
+            }
+        }
+    }
+
+    Ok(())
+}
+
+fn split_vevents(ics: &str) -> Vec<String> {
+    let mut vevents = Vec::new();
+    let mut in_event = false;
+    let mut buffer = String::new();
+
+    for line in ics.lines() {
+        if line.trim() == "BEGIN:VEVENT" {
+            in_event = true;
+            buffer.clear();
+        }
+
+        if in_event {
+            buffer.push_str(line);
+            buffer.push('\n');
+        }
+
+        if line.trim() == "END:VEVENT" && in_event {
+            in_event = false;
+            vevents.push(buffer.clone());
+        }
+    }
+
+    vevents
+}
+
+fn extract_uid(event: &str) -> Option<String> {
+    for line in event.lines() {
+        if line.starts_with("UID:") {
+            return Some(line.trim_start_matches("UID:").trim().to_string());
+        }
+    }
+    None
+}
+
+fn sanitize_filename(name: &str) -> String {
+    let re = Regex::new(r"[^a-zA-Z0-9._-]").unwrap();
+    re.replace_all(name, "_").to_string()
+}