feat: add file serving endpoint GET /assets/:id/file

crates/presentation/src/handlers/assets.rs

@@ -9,8 +9,10 @@ use application::{
 };
 use axum::{
     Json,
+    body::Body,
     extract::{Multipart, Path, Query, State},
-    http::StatusCode,
+    http::{StatusCode, header},
+    response::Response,
 };
 use domain::value_objects::{MetadataValue, StructuredData, SystemId};
 use sha2::{Digest, Sha256};
@@ -171,3 +173,39 @@ pub async fn update_metadata(
     state.update_metadata_handler.execute(cmd).await?;
     Ok(Json(serde_json::json!({ "status": "updated" })))
 }
+
+pub async fn serve_file(
+    State(state): State<AppState>,
+    _claims: JwtClaims,
+    Path((asset_id,)): Path<(uuid::Uuid,)>,
+) -> Result<Response, AppError> {
+    let asset = state
+        .asset_repo
+        .find_by_id(&SystemId::from_uuid(asset_id))
+        .await?
+        .ok_or_else(|| domain::errors::DomainError::NotFound("Asset not found".into()))?;
+
+    let data = state
+        .file_storage
+        .read_file(&asset.source_reference.relative_path)
+        .await?;
+
+    Ok(Response::builder()
+        .status(StatusCode::OK)
+        .header(header::CONTENT_TYPE, &asset.mime_type)
+        .header(header::CONTENT_LENGTH, data.len())
+        .header(
+            header::CONTENT_DISPOSITION,
+            format!(
+                "inline; filename=\"{}\"",
+                asset
+                    .source_reference
+                    .relative_path
+                    .rsplit('/')
+                    .next()
+                    .unwrap_or("file")
+            ),
+        )
+        .body(Body::from(data))
+        .unwrap())
+}