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use anyhow::Result;
use futures::stream::{BoxStream, Stream, StreamExt};
use futures::future::{BoxFuture, FutureExt};
use hyper::body::Bytes;
use aero_dav::types as dav;
use aero_dav::realization::All;
use aero_collections::davdag::Etag;
use super::controller::ArcUser;
pub(crate) type Content<'a> = BoxStream<'a, std::result::Result<Bytes, std::io::Error>>;
pub(crate) type PropertyStream<'a> = BoxStream<'a, std::result::Result<dav::Property<All>, dav::PropertyRequest<All>>>;
pub(crate) enum PutPolicy {
CreateOnly,
ReplaceEtag(String),
}
/// A DAV node should implement the following methods
/// @FIXME not satisfied by BoxFutures but I have no better idea currently
pub(crate) trait DavNode: Send {
// recurence, filesystem hierarchy
/// This node direct children
fn children<'a>(&self, user: &'a ArcUser) -> BoxFuture<'a, Vec<Box<dyn DavNode>>>;
/// Recursively fetch a child (progress inside the filesystem hierarchy)
fn fetch<'a>(&self, user: &'a ArcUser, path: &'a [&str], create: bool) -> BoxFuture<'a, Result<Box<dyn DavNode>>>;
// node properties
/// Get the path
fn path(&self, user: &ArcUser) -> String;
/// Get the supported WebDAV properties
fn supported_properties(&self, user: &ArcUser) -> dav::PropName<All>;
/// Get the values for the given properties
fn properties(&self, user: &ArcUser, prop: dav::PropName<All>) -> PropertyStream<'static>;
//fn properties(&self, user: &ArcUser, prop: dav::PropName<All>) -> Vec<dav::AnyProperty<All>>;
/// Put an element (create or update)
fn put<'a>(&'a self, policy: PutPolicy, stream: Content<'a>) -> BoxFuture<'a, std::result::Result<Etag, std::io::Error>>;
/// Content type of the element
fn content_type(&self) -> &str;
/// Get content
fn content(&self) -> Content<'static>;
//@FIXME maybe add etag, maybe add a way to set content
/// Utility function to get a propname response from a node
fn response_propname(&self, user: &ArcUser) -> dav::Response<All> {
dav::Response {
status_or_propstat: dav::StatusOrPropstat::PropStat(
dav::Href(self.path(user)),
vec![
dav::PropStat {
status: dav::Status(hyper::StatusCode::OK),
prop: dav::AnyProp(self.supported_properties(user).0.into_iter().map(dav::AnyProperty::Request).collect()),
error: None,
responsedescription: None,
}
],
),
error: None,
location: None,
responsedescription: None
}
}
/// Utility function to get a prop response from a node & a list of propname
fn response_props(&self, user: &ArcUser, props: dav::PropName<All>) -> BoxFuture<'static, dav::Response<All>> {
//@FIXME we should make the DAV parsed object a stream...
let mut result_stream = self.properties(user, props);
let path = self.path(user);
async move {
let mut prop_desc = vec![];
let (mut found, mut not_found) = (vec![], vec![]);
while let Some(maybe_prop) = result_stream.next().await {
match maybe_prop {
Ok(v) => found.push(dav::AnyProperty::Value(v)),
Err(v) => not_found.push(dav::AnyProperty::Request(v)),
}
}
// If at least one property has been found on this object, adding a HTTP 200 propstat to
// the response
if !found.is_empty() {
prop_desc.push(dav::PropStat {
status: dav::Status(hyper::StatusCode::OK),
prop: dav::AnyProp(found),
error: None,
responsedescription: None,
});
}
// If at least one property can't be found on this object, adding a HTTP 404 propstat to
// the response
if !not_found.is_empty() {
prop_desc.push(dav::PropStat {
status: dav::Status(hyper::StatusCode::NOT_FOUND),
prop: dav::AnyProp(not_found),
error: None,
responsedescription: None,
})
}
// Build the finale response
dav::Response {
status_or_propstat: dav::StatusOrPropstat::PropStat(dav::Href(path), prop_desc),
error: None,
location: None,
responsedescription: None
}
}.boxed()
}
}
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