Rename dav crate to caldav to prepare splitting dav functionality into dav crate

crates/caldav/src/error.rs

@@ -0,0 +1,42 @@
+use actix_web::{http::StatusCode, HttpResponse};
+use thiserror::Error;
+
+use crate::routes::propfind;
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("Not found")]
+    NotFound,
+    #[error("Bad request")]
+    BadRequest,
+    #[error("Unauthorized")]
+    Unauthorized,
+    #[error("Internal server error :(")]
+    InternalError,
+    #[error(transparent)]
+    PropfindError(#[from] propfind::Error),
+    #[error("Internal server error")]
+    Other(#[from] anyhow::Error),
+}
+
+impl actix_web::error::ResponseError for Error {
+    fn status_code(&self) -> StatusCode {
+        match self {
+            Self::InternalError => StatusCode::INTERNAL_SERVER_ERROR,
+            Self::Other(_) => StatusCode::INTERNAL_SERVER_ERROR,
+            Self::NotFound => StatusCode::NOT_FOUND,
+            Self::BadRequest => StatusCode::BAD_REQUEST,
+            Self::Unauthorized => StatusCode::UNAUTHORIZED,
+            Self::PropfindError(e) => e.status_code(),
+        }
+    }
+
+    fn error_response(&self) -> HttpResponse {
+        match self {
+            Error::Unauthorized => HttpResponse::build(self.status_code())
+                .append_header(("WWW-Authenticate", "Basic"))
+                .body(self.to_string()),
+            _ => HttpResponse::build(self.status_code()).body(self.to_string()),
+        }
+    }
+}