Make MultistatusElement responder, other refactoring

crates/dav/src/xml/multistatus.rs

@@ -0,0 +1,38 @@
+use actix_web::{
+    body::BoxBody, http::header::ContentType, HttpRequest, HttpResponse, Responder, ResponseError,
+};
+use log::debug;
+use serde::Serialize;
+
+#[derive(Serialize)]
+#[serde(rename = "multistatus")]
+pub struct MultistatusElement<T1: Serialize, T2: Serialize> {
+    #[serde(rename = "response")]
+    pub responses: Vec<T1>,
+    #[serde(rename = "response")]
+    pub member_responses: Vec<T2>,
+    #[serde(rename = "@xmlns")]
+    pub ns_dav: &'static str,
+    #[serde(rename = "@xmlns:C")]
+    pub ns_caldav: &'static str,
+    #[serde(rename = "@xmlns:IC")]
+    pub ns_ical: &'static str,
+}
+
+impl<T1: Serialize, T2: Serialize> Responder for MultistatusElement<T1, T2> {
+    type Body = BoxBody;
+
+    fn respond_to(self, _req: &HttpRequest) -> HttpResponse<Self::Body> {
+        let mut output = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n".to_owned();
+        let mut ser = quick_xml::se::Serializer::new(&mut output);
+        ser.indent(' ', 4);
+        if let Err(err) = self.serialize(ser) {
+            return crate::Error::from(err).error_response();
+        }
+        debug!("Return multistatus:\n{output}");
+
+        HttpResponse::MultiStatus()
+            .content_type(ContentType::xml())
+            .body(output)
+    }
+}