Implement download feature for calendars and addressbooks

Fixes #70

crates/carddav/src/addressbook/methods/get.rs

@@ -0,0 +1,59 @@
+use crate::Error;
+use crate::addressbook::AddressbookResourceService;
+use crate::addressbook::resource::AddressbookResource;
+use axum::body::Body;
+use axum::extract::{Path, State};
+use axum::response::Response;
+use axum_extra::headers::{ContentType, HeaderMapExt};
+use http::{HeaderValue, StatusCode, header};
+use percent_encoding::{CONTROLS, utf8_percent_encode};
+use rustical_dav::privileges::UserPrivilege;
+use rustical_dav::resource::Resource;
+use rustical_ical::AddressObject;
+use rustical_store::auth::User;
+use rustical_store::{AddressbookStore, SubscriptionStore};
+use std::str::FromStr;
+use tracing::instrument;
+
+#[instrument(skip(addr_store))]
+pub async fn route_get<AS: AddressbookStore, S: SubscriptionStore>(
+    Path((principal, addressbook_id)): Path<(String, String)>,
+    State(AddressbookResourceService { addr_store, .. }): State<AddressbookResourceService<AS, S>>,
+    user: User,
+) -> Result<Response, Error> {
+    if !user.is_principal(&principal) {
+        return Err(Error::Unauthorized);
+    }
+
+    let addressbook = addr_store
+        .get_addressbook(&principal, &addressbook_id, false)
+        .await?;
+    let addressbook_resource = AddressbookResource(addressbook);
+    if !addressbook_resource
+        .get_user_privileges(&user)?
+        .has(&UserPrivilege::Read)
+    {
+        return Err(Error::Unauthorized);
+    }
+
+    let objects = addr_store.get_objects(&principal, &addressbook_id).await?;
+    let vcf = objects
+        .iter()
+        .map(AddressObject::get_vcf)
+        .collect::<Vec<_>>()
+        .join("\r\n");
+
+    let mut resp = Response::builder().status(StatusCode::OK);
+    let hdrs = resp.headers_mut().unwrap();
+    hdrs.typed_insert(ContentType::from_str("text/vcard").unwrap());
+    let filename = format!("{}_{}.vcf", principal, addressbook_id);
+    let filename = utf8_percent_encode(&filename, CONTROLS);
+    hdrs.insert(
+        header::CONTENT_DISPOSITION,
+        HeaderValue::from_str(&format!(
+            "attachement; filename*=UTF-8''{filename}; filename={filename}",
+        ))
+        .unwrap(),
+    );
+    Ok(resp.body(Body::new(vcf)).unwrap())
+}

crates/carddav/src/addressbook/methods/mod.rs

@@ -1,3 +1,4 @@
 pub mod mkcol;
 // pub mod post;
+pub mod get;
 pub mod report;