suggested extensions (#9526)

Follow-up from #9138

Release Notes:

- Adds suggested extensions for some filetypes
([#7096](https://github.com/zed-industries/zed/issues/7096)).

---------

Co-authored-by: Felix Zeller <felixazeller@gmail.com>

crates/collab/src/api/extensions.rs

@@ -21,6 +21,10 @@ use util::ResultExt;
 pub fn router() -> Router {
     Router::new()
         .route("/extensions", get(get_extensions))
+        .route(
+            "/extensions/:extension_id/download",
+            get(download_latest_extension),
+        )
         .route(
             "/extensions/:extension_id/:version/download",
             get(download_extension),
@@ -32,6 +36,11 @@ struct GetExtensionsParams {
     filter: Option<String>,
 }
 
+#[derive(Debug, Deserialize)]
+struct DownloadLatestExtensionParams {
+    extension_id: String,
+}
+
 #[derive(Debug, Deserialize)]
 struct DownloadExtensionParams {
     extension_id: String,
@@ -60,6 +69,25 @@ async fn get_extensions(
     Ok(Json(GetExtensionsResponse { data: extensions }))
 }
 
+async fn download_latest_extension(
+    Extension(app): Extension<Arc<AppState>>,
+    Path(params): Path<DownloadLatestExtensionParams>,
+) -> Result<Redirect> {
+    let extension = app
+        .db
+        .get_extension(&params.extension_id)
+        .await?
+        .ok_or_else(|| anyhow!("unknown extension"))?;
+    download_extension(
+        Extension(app),
+        Path(DownloadExtensionParams {
+            extension_id: params.extension_id,
+            version: extension.version,
+        }),
+    )
+    .await
+}
+
 async fn download_extension(
     Extension(app): Extension<Arc<AppState>>,
     Path(params): Path<DownloadExtensionParams>,