feat: caldav client

2025-10-11 15:06:19 +02:00
parent 639b2c1aeb
commit a0ea5a83a5
6 changed files with 674 additions and 0 deletions
--- a/src-tauri/Cargo.lock
+++ b/src-tauri/Cargo.lock
@ -88,7 +88,13 @@ checksum = "a23eb6b1614318a8071c9b2521f36b424b2c83db5eb3a0fead4a6c0809af6e61"
 name = "app"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
+ "chrono",
+ "diqwest",
+ "icalendar",
 "log",
+ "minidom",
+ "reqwest",
 "serde",
 "serde_json",
 "tauri",
@ -393,6 +399,15 @@ dependencies = [
 "toml 0.9.7",
 ]

+[[package]]
+name = "castaway"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dec551ab6e7578819132c713a93c022a05d60159dc86e7a7050223577484c55a"
+dependencies = [
+ "rustversion",
+]
+
 [[package]]
 name = "cc"
 version = "1.2.39"
@ -449,11 +464,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "145052bdd345b87320e369255277e3fb5152762ad123a901ef5c262dd38fe8d2"
 dependencies = [
 "iana-time-zone",
+ "js-sys",
 "num-traits",
 "serde",
+ "wasm-bindgen",
 "windows-link 0.2.0",
 ]

+[[package]]
+name = "chrono-tz"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "efdce149c370f133a071ca8ef6ea340b7b88748ab0810097a9e2976eaa34b4f3"
+dependencies = [
+ "chrono",
+ "chrono-tz-build",
+ "phf 0.11.3",
+]
+
+[[package]]
+name = "chrono-tz-build"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f10f8c9340e31fc120ff885fcdb54a0b48e474bbd77cab557f0c30a3e569402"
+dependencies = [
+ "parse-zoneinfo",
+ "phf_codegen 0.11.3",
+]
+
 [[package]]
 name = "combine"
 version = "4.6.7"
@ -464,6 +502,19 @@ dependencies = [
 "memchr",
 ]

+[[package]]
+name = "compact_str"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f86b9c4c00838774a6d902ef931eff7470720c51d90c2e32cfe15dc304737b3f"
+dependencies = [
+ "castaway",
+ "cfg-if",
+ "itoa",
+ "ryu",
+ "static_assertions",
+]
+
 [[package]]
 name = "convert_case"
 version = "0.4.0"
@ -678,6 +729,30 @@ dependencies = [
 "crypto-common",
 ]

+[[package]]
+name = "digest_auth"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3054f4e81d395e50822796c5e99ca522e6ba7be98947d6d4b0e5e61640bdb894"
+dependencies = [
+ "digest",
+ "hex",
+ "md-5",
+ "rand 0.8.5",
+ "sha2",
+]
+
+[[package]]
+name = "diqwest"
+version = "3.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "753559f3659efa905c873c59efad5ef0f5e94912b3dbd2069331c554daa33d81"
+dependencies = [
+ "digest_auth",
+ "reqwest",
+ "url",
+]
+
 [[package]]
 name = "dirs"
 version = "6.0.0"
@ -1512,6 +1587,20 @@ dependencies = [
 "cc",
 ]

+[[package]]
+name = "icalendar"
+version = "0.17.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f25bc68d1c3113be52919708c870cabe55ba0646b9dade87913fe565aa956a3b"
+dependencies = [
+ "chrono",
+ "chrono-tz",
+ "iso8601",
+ "nom",
+ "nom-language",
+ "uuid",
+]
+
 [[package]]
 name = "ico"
 version = "0.4.0"
@ -1694,6 +1783,15 @@ dependencies = [
 "serde",
 ]

+[[package]]
+name = "iso8601"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1082f0c48f143442a1ac6122f67e360ceee130b967af4d50996e5154a45df46"
+dependencies = [
+ "nom",
+]
+
 [[package]]
 name = "itoa"
 version = "1.0.15"
@ -1924,6 +2022,16 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2532096657941c2fea9c289d370a250971c689d4f143798ff67113ec042024a5"

+[[package]]
+name = "md-5"
+version = "0.10.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d89e7ee0cfbedfc4da3340218492196241d89eefb6dab27de5df917a6d2e78cf"
+dependencies = [
+ "cfg-if",
+ "digest",
+]
+
 [[package]]
 name = "memchr"
 version = "2.7.6"
@ -1945,6 +2053,15 @@ version = "0.3.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6877bb514081ee2a7ff5ef9de3281f14a4dd4bceac4c09388074a6b5df8a139a"

+[[package]]
+name = "minidom"
+version = "0.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1d0766d3b25519bd1462d4ca35480e1efabe19727bc4c269aba3b255c0a7a66"
+dependencies = [
+ "rxml",
+]
+
 [[package]]
 name = "miniz_oxide"
 version = "0.8.9"
@ -2029,6 +2146,24 @@ version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "72ef4a56884ca558e5ddb05a1d1e7e1bfd9a68d9ed024c21704cc98872dae1bb"

+[[package]]
+name = "nom"
+version = "8.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df9761775871bdef83bee530e60050f7e54b1105350d6884eb0fb4f46c2f9405"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "nom-language"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2de2bc5b451bfedaef92c90b8939a8fff5770bdcc1fafd6239d086aab8fa6b29"
+dependencies = [
+ "nom",
+]
+
 [[package]]
 name = "num-conv"
 version = "0.1.0"
@ -2381,6 +2516,15 @@ dependencies = [
 "windows-targets 0.52.6",
 ]

+[[package]]
+name = "parse-zoneinfo"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f2a05b18d44e2957b88f96ba460715e295bc1d7510468a2f3d3b44535d26c24"
+dependencies = [
+ "regex",
+]
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.2"
@ -3135,6 +3279,26 @@ version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"

+[[package]]
+name = "rxml"
+version = "0.13.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f288457ad3607c08953ca5604229ebb03878a0b4491d8f545d547281c2b3e0c5"
+dependencies = [
+ "bytes",
+ "futures-core",
+ "rxml_validation",
+]
+
+[[package]]
+name = "rxml_validation"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "826e80413b9a35e9d33217b3dcac04cf95f6559d15944b93887a08be5496c4a4"
+dependencies = [
+ "compact_str",
+]
+
 [[package]]
 name = "ryu"
 version = "1.0.20"
@ -3529,6 +3693,12 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"

+[[package]]
+name = "static_assertions"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
 [[package]]
 name = "string_cache"
 version = "0.8.9"
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@ -27,3 +27,9 @@ tauri-plugin-keep-screen-on = "0.1.2"
 tauri-plugin-upload = "2"
 tauri-plugin-fs = "2"
 tauri-plugin-tts = { git = "https://github.com/cfpwastaken/tauri-plugin-tts.git" }
+reqwest = { version = "0.12.23", default-features = false, features = ["rustls-tls"] }
+diqwest = "3.1.0"
+minidom = "0.17.0"
+icalendar = { version = "0.17.5", features = ["chrono-tz"] }
+anyhow = "1.0.100"
+chrono = "0.4.42"
--- a/src-tauri/src/dav.rs
+++ b/src-tauri/src/dav.rs
@ -0,0 +1,389 @@
+use std::fmt::Display;
+
+use diqwest::WithDigestAuth;
+use icalendar::{Calendar};
+use minidom::Element;
+use reqwest::{
+	header::{CONTENT_TYPE, USER_AGENT}, Client, Method, RequestBuilder, Url
+};
+use serde::{Deserialize, Serialize};
+
+static PRINCIPAL_BODY: &str = r#"
+<d:propfind xmlns:d="DAV:">
+	<d:prop>
+		<d:current-user-principal />
+	</d:prop>
+</d:propfind>
+"#;
+
+static HOMESET_BODY: &str = r#"
+<d:propfind xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav">
+	<d:prop>
+		<c:calendar-home-set />
+	</d:prop>
+</d:propfind>
+"#;
+
+static CAL_BODY: &str = r#"
+<d:propfind xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav" >
+	<d:prop>
+		<d:displayname />
+		<d:resourcetype />
+		<c:supported-calendar-component-set />
+	</d:prop>
+</d:propfind>
+"#;
+
+static EVENT_BODY: &str = r#"
+<c:calendar-query xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav">
+	<d:prop>
+		<d:getetag />
+		<c:calendar-data />
+	</d:prop>
+	<c:filter>
+		<c:comp-filter name="VCALENDAR">
+			<c:comp-filter name="VEVENT" >
+				<c:time-range start="{start}" end="{end}" />
+			</c:comp-filter>
+		</c:comp-filter>
+	</c:filter>
+</c:calendar-query>
+"#;
+
+pub fn find_elems(root: &Element, tag: String) -> Vec<&Element> {
+	let mut elems: Vec<&Element> = Vec::new();
+
+	for el in root.children() {
+		if el.name() == tag {
+			elems.push(el);
+		} else {
+			let ret = find_elems(el, tag.clone());
+			elems.extend(ret);
+		}
+	}
+	elems
+}
+
+pub fn find_elem(root: &Element, tag: String) -> Option<&Element> {
+	if root.name() == tag {
+		return Some(root);
+	}
+
+	for el in root.children() {
+		if el.name() == tag {
+			return Some(el);
+		} else {
+			let ret = find_elem(el, tag.clone());
+			if ret.is_some() {
+				return ret;
+			}
+		}
+	}
+	None
+}
+
+#[derive(Clone, Serialize, Deserialize)]
+pub enum AuthScheme {
+	Basic,
+	Digest,
+}
+
+impl std::str::FromStr for AuthScheme {
+	type Err = String;
+
+	fn from_str(s: &str) -> Result<Self, Self::Err> {
+		match s.to_lowercase().as_str() {
+			"basic" => Ok(AuthScheme::Basic),
+			"digest" => Ok(AuthScheme::Digest),
+			_ => Err(format!("Invalid auth scheme: {}", s)),
+		}
+	}
+}
+
+impl Display for AuthScheme {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		match self {
+			AuthScheme::Basic => write!(f, "Basic"),
+			AuthScheme::Digest => write!(f, "Digest"),
+		}
+	}
+}
+
+pub trait ReqwestAuth {
+	fn send_authed(self, scheme: &AuthScheme, username: &str, password: &str) -> impl std::future::Future<Output = anyhow::Result<reqwest::Response>> + Send;
+}
+
+impl ReqwestAuth for RequestBuilder {
+	fn send_authed(self, scheme: &AuthScheme, username: &str, password: &str) -> impl std::future::Future<Output = anyhow::Result<reqwest::Response>> + Send {
+		async move {
+			let res = match scheme {
+				AuthScheme::Basic => self.basic_auth(username, Some(password)).send().await?,
+				AuthScheme::Digest => self.send_with_digest_auth(username, password).await?,
+			};
+			Ok(res)
+		}
+	}
+}
+
+pub async fn request(
+	client: &Client,
+	method: Method,
+	url: Url,
+	body: String,
+	depth: u8,
+	credentials: &DAVCredentials,
+) -> anyhow::Result<Element> {
+	let res = client
+		.request(method, url)
+		.header("Depth", depth.to_string())
+		.header(USER_AGENT, "TrafficCue")
+		.header(CONTENT_TYPE, "application/xml")
+		.body(body)
+		.send_authed(&credentials.scheme, &credentials.username, &credentials.password)
+		.await?;
+	let status = res.status();
+	if !status.is_success() {
+		Err(anyhow::anyhow!("Request failed with status: {}", status))?;
+	}
+
+	let text = res.text().await?;
+	let root: Element = text.parse()?;
+	Ok(root)
+}
+
+#[derive(Clone, Serialize, Deserialize)]
+pub struct DAVCredentials {
+	pub scheme: AuthScheme,
+	pub username: String,
+	pub password: String,
+}
+
+impl DAVCredentials {
+	pub async fn find_scheme(url: &Url) -> anyhow::Result<AuthScheme> {
+		let client = Client::new();
+		let res = client
+			.request(Method::from_bytes(b"PROPFIND").expect("Invalid method"), url.clone())
+			.header(USER_AGENT, "TrafficCue")
+			.send()
+			.await;
+		if res.is_err() {
+			return Err(anyhow::anyhow!("Failed to connect to server"));
+		}
+		let res = res.unwrap();
+		if res.status().is_success() {
+			return Err(anyhow::anyhow!("Server did not require authentication"));
+		}
+		let headers = res.headers();
+		if let Some(www_auth) = headers.get("www-authenticate") {
+			let www_auth = www_auth.to_str().unwrap_or("");
+			if www_auth.to_lowercase().contains("digest") {
+				return Ok(AuthScheme::Digest);
+			} else if www_auth.to_lowercase().contains("basic") {
+				return Ok(AuthScheme::Basic);
+			}
+		}
+		Err(anyhow::anyhow!("Could not determine authentication scheme"))
+	}
+}
+
+/// Client for interacting with a CalDAV server.
+/// ## Example
+/// ```
+/// let client = DAVClient::new("https://cal.example.com/.well-known/caldav", DAVCredentials {
+///     username: "user".into(),
+///     password: "pass".into(),
+/// });
+/// client.init().await?;
+/// let calendars = client.get_calendars().await?;
+/// for cal in calendars {
+///     println!("{}", cal);
+///     let events = cal.get_events(&client.credentials).await?;
+///     for event in events {
+///         println!("Event:\n{}", event);
+///     }
+/// }
+/// ```
+pub struct DAVClient {
+	pub url: Url,
+	pub credentials: DAVCredentials,
+	client: Client,
+
+	principal_url: Option<Url>,
+	cal_url: Option<Url>,
+}
+
+impl DAVClient {
+	/// **Ensure the URL is actually the CalDAV endpoint, and not just the base URL.**
+	pub fn new(string_url: &str, credentials: DAVCredentials) -> Self {
+		let url = Url::parse(string_url).expect("Invalid URL");
+		Self {
+			url,
+			credentials,
+			client: Client::new(),
+			principal_url: None,
+			cal_url: None,
+		}
+	}
+
+	pub async fn init(&mut self) -> anyhow::Result<()> {
+		self.get_principal().await?;
+		self.get_cal_homeset().await?;
+		Ok(())
+	}
+
+	pub async fn _propfind(
+		&mut self,
+		url: Url,
+		body: String,
+		depth: u8,
+	) -> anyhow::Result<Element> {
+		let method = Method::from_bytes(b"PROPFIND").expect("Invalid method");
+		let root = request(
+			&self.client,
+			method,
+			url,
+			body,
+			depth,
+			&self.credentials,
+		).await?;
+		Ok(root)
+	}
+
+	pub async fn get_principal(&mut self) -> anyhow::Result<()> {
+		let root: Element = self
+			._propfind(self.url.clone(), PRINCIPAL_BODY.to_string(), 0)
+			.await?;
+		let principal = find_elem(&root, "current-user-principal".to_string())
+			.ok_or(anyhow::anyhow!("No principal found"))?;
+		let principal_href =
+			find_elem(principal, "href".to_string()).ok_or(anyhow::anyhow!("No href found"))?;
+		let h_str = principal_href.text();
+		let mut p_url = self.url.clone();
+		p_url.set_path(&h_str);
+		self.principal_url = Some(p_url);
+		Ok(())
+	}
+
+	pub async fn get_cal_homeset(&mut self) -> anyhow::Result<()> {
+		if self.principal_url.is_none() {
+			return Err(anyhow::anyhow!("Principal URL not set"));
+		}
+		let root: Element = self
+			._propfind(
+				self.principal_url.clone().unwrap(),
+				HOMESET_BODY.to_string(),
+				0,
+			)
+			.await?;
+		let homeset = find_elem(&root, "calendar-home-set".to_string())
+			.ok_or(anyhow::anyhow!("No calendar-home-set found"))?;
+		let href =
+			find_elem(homeset, "href".to_string()).ok_or(anyhow::anyhow!("No href found"))?;
+		let h_str = href.text();
+		let mut cal_url = self.url.clone();
+		cal_url.set_path(&h_str);
+		self.cal_url = Some(cal_url.clone());
+		Ok(())
+	}
+
+	pub async fn get_calendars(&mut self) -> anyhow::Result<Vec<DAVCalendar>> {
+		if self.cal_url.is_none() {
+			return Err(anyhow::anyhow!("Calendar URL not set"));
+		}
+		let root: Element = self
+			._propfind(self.cal_url.clone().unwrap(), CAL_BODY.to_string(), 1)
+			.await?;
+		let reps = find_elems(&root, "response".to_string());
+		let mut calendars = Vec::new();
+		for rep in reps {
+			let displayname = find_elem(rep, "displayname".to_string())
+				.ok_or(anyhow::anyhow!("No displayname found"))?
+				.text();
+			if displayname == "" {
+				continue;
+			}
+
+			let resourcetype = find_elem(rep, "resourcetype".to_string())
+				.ok_or(anyhow::anyhow!("No resourcetype found"))?;
+			let is_calendar = find_elem(resourcetype, "calendar".to_string()).is_some();
+			if !is_calendar {
+				continue;
+			}
+
+			let url_base = self.cal_url.as_ref().unwrap();
+			let mut href = url_base.clone();
+			href.set_path(
+				&find_elem(rep, "href".to_string())
+					.ok_or(anyhow::anyhow!("No href found"))?
+					.text(),
+			);
+			calendars.push(DAVCalendar {
+				name: displayname,
+				url: href,
+			});
+		}
+
+		Ok(calendars)
+	}
+}
+
+/// Represents a CalDAV calendar.
+/// Can be used to fetch events.
+#[derive(Serialize, Deserialize, Clone)]
+pub struct DAVCalendar {
+	pub name: String,
+	pub url: Url,
+}
+
+impl Display for DAVCalendar {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		write!(f, "{} ({})", self.name, self.url)
+	}
+}
+
+impl DAVCalendar {
+	pub fn new(name: &str, url: Url) -> Self {
+		Self {
+			name: name.to_string(),
+			url,
+		}
+	}
+
+	pub async fn _report(
+		&mut self,
+		credentials: &DAVCredentials,
+		body: String,
+	) -> anyhow::Result<Element> {
+		let client = Client::new();
+		let method = Method::from_bytes(b"REPORT").expect("Invalid method");
+		let root = request(
+			&client,
+			method,
+			self.url.clone(),
+			body,
+			1,
+			credentials,
+		).await?;
+		Ok(root)
+	}
+
+	pub async fn get_events(
+		&mut self,
+		credentials: &DAVCredentials,
+	) -> anyhow::Result<Vec<Calendar>> {
+		let mut events = Vec::new();
+		let time = chrono::Utc::now();
+		let start = time.format("%Y%m%dT000000Z").to_string();
+		let end = time.format("%Y%m%dT235959Z").to_string();
+		let body = EVENT_BODY.replace("{start}", &start).replace("{end}", &end);
+		let root = self._report(credentials, body).await?;
+		let datas = find_elems(&root, "calendar-data".to_string());
+		for data in datas {
+			let etext = data.text();
+			let cal: Calendar = etext.parse().unwrap();
+			events.push(cal);
+		}
+
+		Ok(events)
+	}
+}
--- a/src-tauri/src/dav_commands.rs
+++ b/src-tauri/src/dav_commands.rs
@ -0,0 +1,64 @@
+use chrono::Local;
+use icalendar::{CalendarComponent, Component, DatePerhapsTime, EventLike};
+
+use crate::dav::{DAVClient, DAVCalendar, DAVCredentials};
+
+#[tauri::command]
+pub async fn dav_find_scheme(url: &str) -> Result<String, String> {
+	let url = reqwest::Url::parse(url).map_err(|e| format!("Invalid URL: {}", e))?;
+	let scheme = DAVCredentials::find_scheme(&url).await.map_err(|e| format!("Failed to determine authentication scheme: {}", e))?;
+	Ok(scheme.to_string())
+}
+
+#[tauri::command]
+pub async fn dav_fetch_calendars(url: &str, credentials: DAVCredentials) -> Result<Vec<DAVCalendar>, String> {
+	let mut client = DAVClient::new(url, credentials);
+	client.init().await.map_err(|e| format!("Failed to initialize DAV client: {}", e))?;
+	let calendars = client.get_calendars().await.map_err(|e| format!("Failed to fetch calendars: {}", e))?;
+	Ok(calendars)
+}
+
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct DAVEvent {
+	summary: String,
+	start: Option<String>,
+	end: Option<String>,
+	description: Option<String>,
+	location: Option<String>,
+}
+
+pub fn dateperhapstime_to_string(d: DatePerhapsTime) -> Option<String> {
+	match d {
+		DatePerhapsTime::DateTime(dt) => dt.try_into_utc(),
+		DatePerhapsTime::Date(d) => d
+			.and_hms_opt(0, 0, 0)
+			.and_then(|dt| dt.and_local_timezone(Local).earliest())
+			.map(|dt| dt.to_utc()),
+	}.map(|dt| dt.to_rfc3339())
+}
+
+#[tauri::command]
+pub async fn dav_fetch_events(calendar: DAVCalendar, credentials: DAVCredentials) -> Result<Vec<DAVEvent>, String> {
+	let events = calendar.clone().get_events(&credentials).await.map_err(|e| format!("Failed to fetch events: {}", e))?;
+	let mut res: Vec<DAVEvent> = Vec::new();
+	for event in events {
+		for component in &event.components {
+			if let CalendarComponent::Event(event) = component {
+				let location = event.get_location();
+				if location.is_none() {
+					continue;
+				}
+				let start_at = event.get_start().and_then(dateperhapstime_to_string);
+				let end_at = event.get_end().and_then(dateperhapstime_to_string);
+				res.push(DAVEvent {
+					summary: event.get_summary().unwrap_or("No summary").to_string(),
+					start: start_at,
+					end: end_at,
+					description: event.get_description().map(|s| s.to_string()),
+					location: location.map(|s| s.to_string()),
+				});
+			}
+		}
+	}
+	Ok(res)
+}
--- a/src-tauri/src/lib.rs
+++ b/src-tauri/src/lib.rs
@ -1,3 +1,6 @@
+mod dav;
+mod dav_commands;
+
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
 pub fn run() {
    tauri::Builder::default()
@ -15,6 +18,7 @@ pub fn run() {
            }
            Ok(())
        })
+        .invoke_handler(tauri::generate_handler![dav_commands::dav_find_scheme, dav_commands::dav_fetch_calendars, dav_commands::dav_fetch_events])
        .run(tauri::generate_context!())
        .expect("error while running tauri application");
 }
--- a/src/lib/components/lnv/sidebar/settings/DeveloperSidebar.svelte
+++ b/src/lib/components/lnv/sidebar/settings/DeveloperSidebar.svelte
@ -1,5 +1,6 @@
 <script>
 	import {
+	CalendarSearchIcon,
 		CloudUploadIcon,
 		HandIcon,
 		MapIcon,
@ -24,6 +25,7 @@
 		syncStores,
 		updateStore,
 	} from "$lib/services/stores.svelte";
+	import { invoke } from "@tauri-apps/api/core";

 	const dev = getDeveloperToggle();

@ -54,6 +56,45 @@
 				await downloadPMTiles(url, name);
 			}}
 		/>
+		<SettingsButton
+			icon={CalendarSearchIcon}
+			text="Fetch calendars"
+			onclick={async () => {
+				const url = prompt("URL?");
+				if (!url) return;
+				const scheme = await invoke("dav_find_scheme", { url })
+					.catch((err) => {
+						alert("Error fetching scheme: " + err);
+					});
+				alert("Found scheme: " + scheme);
+				const username = prompt("Username?");
+				const password = prompt("Password?");
+				if (!username || !password) return;
+				const credentials = { scheme, username, password };
+				invoke("dav_fetch_calendars", { url, credentials }).then((calendars) => {
+					alert("Fetched calendars: " + JSON.stringify(calendars));
+				}).catch((err) => {
+					alert("Error fetching calendars: " + err);
+				});
+			}}
+		/>
+		<SettingsButton
+			icon={CalendarSearchIcon}
+			text="Fetch CalDAV events"
+			onclick={async () => {
+				const url = prompt("URL?");
+				const scheme = prompt("Scheme? (basic, digest)");
+				const username = prompt("Username?");
+				const password = prompt("Password?");
+				if (!url || !username || !password) return;
+				const credentials = { scheme, username, password };
+				invoke("dav_fetch_events", { calendar: { name: "Calendar", url }, credentials }).then((events) => {
+					alert("Fetched events: " + JSON.stringify(events));
+				}).catch((err) => {
+					alert("Error fetching events: " + err);
+				});
+			}}
+		/>
 	</section>

 	<section>