feat: implement album sharing functionality with permissions management

libertas_infra/src/repositories/album_share_repository.rs

@@ -0,0 +1,87 @@
+use async_trait::async_trait;
+use libertas_core::{
+    error::{CoreError, CoreResult},
+    models::AlbumPermission,
+    repositories::AlbumShareRepository,
+};
+use sqlx::PgPool;
+use uuid::Uuid;
+
+#[derive(Clone)]
+pub struct PostgresAlbumShareRepository {
+    pool: PgPool,
+}
+
+impl PostgresAlbumShareRepository {
+    pub fn new(pool: PgPool) -> Self {
+        Self { pool }
+    }
+}
+
+#[async_trait]
+impl AlbumShareRepository for PostgresAlbumShareRepository {
+    async fn create_or_update_share(
+        &self,
+        album_id: Uuid,
+        user_id: Uuid,
+        permission: AlbumPermission,
+    ) -> CoreResult<()> {
+        sqlx::query!(
+            r#"
+            INSERT INTO album_shares (album_id, user_id, permission)
+            VALUES ($1, $2, $3)
+            ON CONFLICT (album_id, user_id)
+            DO UPDATE SET permission = $3
+            "#,
+            album_id,
+            user_id,
+            permission as AlbumPermission,
+        )
+        .execute(&self.pool)
+        .await
+        .map_err(|e| CoreError::Database(e.to_string()))?;
+
+        Ok(())
+    }
+
+    async fn get_user_permission(
+        &self,
+        album_id: Uuid,
+        user_id: Uuid,
+    ) -> CoreResult<Option<AlbumPermission>> {
+        let result = sqlx::query!(
+            r#"
+            SELECT permission as "permission: AlbumPermission"
+            FROM album_shares
+            WHERE album_id = $1 AND user_id = $2
+            "#,
+            album_id,
+            user_id
+        )
+        .fetch_optional(&self.pool)
+        .await
+        .map_err(|e| CoreError::Database(e.to_string()))?;
+
+        Ok(result.map(|row| row.permission))
+    }
+
+    async fn is_media_in_shared_album(&self, media_id: Uuid, user_id: Uuid) -> CoreResult<bool> {
+        let result = sqlx::query!(
+            r#"
+            SELECT EXISTS (
+                SELECT 1
+                FROM album_media am
+                JOIN album_shares ash ON am.album_id = ash.album_id
+                WHERE am.media_id = $1 AND ash.user_id = $2
+            )
+            "#,
+            media_id,
+            user_id
+        )
+        .fetch_one(&self.pool)
+        .await
+        .map_err(|e| CoreError::Database(e.to_string()))?;
+
+        Ok(result.exists.unwrap_or(false))
+    }
+}