Add an accommodations reservations module (#188)

Add a new module to enable accommodations reservation

![](https://gitea.communiquons.org/attachments/de1f5b12-0a93-40f8-b29d-97665daa6fd5)

Reviewed-on: #188

geneit_backend/src/extractors/accommodation_extractor.rs

@@ -0,0 +1,83 @@
+use crate::extractors::family_extractor::FamilyInPath;
+use crate::models::{Accommodation, AccommodationID, FamilyID, Membership};
+use crate::services::accommodations_list_service;
+use actix_web::dev::Payload;
+use actix_web::{FromRequest, HttpRequest};
+use serde::Deserialize;
+use std::ops::Deref;
+
+#[derive(thiserror::Error, Debug)]
+enum AccommodationExtractorErr {
+    #[error("Accommodation {0:?} does not belong to family {1:?}!")]
+    AccommodationNotInFamily(AccommodationID, FamilyID),
+}
+
+#[derive(Debug)]
+pub struct FamilyAndAccommodationInPath(Membership, Accommodation);
+
+impl FamilyAndAccommodationInPath {
+    async fn load_accommodation_from_path(
+        family: FamilyInPath,
+        accommodation_id: AccommodationID,
+    ) -> anyhow::Result<Self> {
+        let accommodation = accommodations_list_service::get_by_id(accommodation_id).await?;
+        if accommodation.family_id() != family.family_id() {
+            return Err(AccommodationExtractorErr::AccommodationNotInFamily(
+                accommodation.id(),
+                family.family_id(),
+            )
+            .into());
+        }
+
+        Ok(Self(family.into(), accommodation))
+    }
+}
+
+impl Deref for FamilyAndAccommodationInPath {
+    type Target = Accommodation;
+
+    fn deref(&self) -> &Self::Target {
+        &self.1
+    }
+}
+
+impl FamilyAndAccommodationInPath {
+    pub fn membership(&self) -> &Membership {
+        &self.0
+    }
+
+    pub fn to_accommodation(self) -> Accommodation {
+        self.1
+    }
+}
+
+#[derive(Deserialize)]
+struct AccommodationIDInPath {
+    accommodation_id: AccommodationID,
+}
+
+impl FromRequest for FamilyAndAccommodationInPath {
+    type Error = actix_web::Error;
+    type Future = futures_util::future::LocalBoxFuture<'static, Result<Self, Self::Error>>;
+
+    fn from_request(req: &HttpRequest, _payload: &mut Payload) -> Self::Future {
+        let req = req.clone();
+        Box::pin(async move {
+            let family = FamilyInPath::extract(&req).await?;
+
+            let accommodation_id = actix_web::web::Path::<AccommodationIDInPath>::from_request(
+                &req,
+                &mut Payload::None,
+            )
+            .await?
+            .accommodation_id;
+
+            Self::load_accommodation_from_path(family, accommodation_id)
+                .await
+                .map_err(|e| {
+                    log::error!("Failed to extract accommodation ID from URL! {}", e);
+                    actix_web::error::ErrorNotFound("Could not fetch accommodation information!")
+                })
+        })
+    }
+}