adding features

src/application/services/file_retrieval_service.rs

@@ -0,0 +1,42 @@
+use std::sync::Arc;
+use async_trait::async_trait;
+use bytes::Bytes;
+use futures::Stream;
+
+use crate::application::dtos::file_dto::FileDto;
+use crate::application::ports::file_ports::FileRetrievalUseCase;
+use crate::application::ports::storage_ports::FileReadPort;
+use crate::common::errors::DomainError;
+
+/// Servicio para operaciones de recuperación de archivos
+pub struct FileRetrievalService {
+    file_repository: Arc<dyn FileReadPort>,
+}
+
+impl FileRetrievalService {
+    /// Crea un nuevo servicio de recuperación de archivos
+    pub fn new(file_repository: Arc<dyn FileReadPort>) -> Self {
+        Self { file_repository }
+    }
+}
+
+#[async_trait]
+impl FileRetrievalUseCase for FileRetrievalService {
+    async fn get_file(&self, id: &str) -> Result<FileDto, DomainError> {
+        let file = self.file_repository.get_file(id).await?;
+        Ok(FileDto::from(file))
+    }
+    
+    async fn list_files(&self, folder_id: Option<&str>) -> Result<Vec<FileDto>, DomainError> {
+        let files = self.file_repository.list_files(folder_id).await?;
+        Ok(files.into_iter().map(FileDto::from).collect())
+    }
+    
+    async fn get_file_content(&self, id: &str) -> Result<Vec<u8>, DomainError> {
+        self.file_repository.get_file_content(id).await
+    }
+    
+    async fn get_file_stream(&self, id: &str) -> Result<Box<dyn Stream<Item = Result<Bytes, std::io::Error>> + Send>, DomainError> {
+        self.file_repository.get_file_stream(id).await
+    }
+}