limit text view to 512KiB, fix deleter sql query

src/deleter.rs

@@ -54,15 +54,13 @@ async fn delete_content(file_id: &str, files_dir: &Path) -> Result<(), std::io::
 }
 
 async fn wait_for_file_expiry(receiver: &Receiver<()>, db: &PgPool) {
-    let mut rows = sqlx::query("SELECT MIN(valid_till) as min from files").fetch(db);
-    let row = rows
-        .try_next()
-        .await
-        .expect("could not fetch expiring files from database")
-        .expect("postgres min did not return any row");
-    let valid_till: Option<NaiveDateTime> = row.get("min");
+    let valid_till: Option<(NaiveDateTime,)> =
+        sqlx::query_as("SELECT MIN(valid_till) as min from files")
+            .fetch_optional(db)
+            .await
+            .expect("could not fetch expiring files from database");
     let next_timeout = match valid_till {
-        Some(valid_till) => valid_till.signed_duration_since(Local::now().naive_local()),
+        Some((valid_till,)) => valid_till.signed_duration_since(Local::now().naive_local()),
         None => Duration::days(1),
     };
     let positive_timeout = next_timeout

src/download.rs

@@ -17,6 +17,8 @@ use crate::{config::Config, file_kind::FileKind};
 const TEXT_VIEW_HTML: &str = include_str!("../template/text-view.html");
 const URL_VIEW_HTML: &str = include_str!("../template/url-view.html");
 
+const TEXT_VIEW_SIZE_LIMIT: u64 = 512 * 1024; // 512KiB
+
 pub async fn download(
     req: HttpRequest,
     db: web::Data<PgPool>,
@@ -29,8 +31,7 @@ pub async fn download(
 
     let download = delete_on_download || req.query_string().contains("dl");
     let content_type = get_content_type(&path);
-    let is_text = file_kind == FileKind::Text.to_string() || content_type.type_() == mime::TEXT;
-    let response = if is_text && !download {
+    let response = if use_text_view(&file_kind, &content_type, &path, download).await {
         build_text_response(&path).await
     } else {
         build_file_response(download, &file_name, path, content_type, req)
@@ -71,6 +72,25 @@ fn get_content_type(path: &Path) -> Mime {
         .expect("tree_magic_mini should not produce invalid mime")
 }
 
+async fn use_text_view(
+    file_kind: &str,
+    content_type: &Mime,
+    file_path: &Path,
+    download: bool,
+) -> bool {
+    let is_text =
+        FileKind::from_str(file_kind) == Ok(FileKind::Text) || content_type.type_() == mime::TEXT;
+    let is_not_large = get_file_size(file_path).await < TEXT_VIEW_SIZE_LIMIT;
+    is_text && is_not_large && !download
+}
+
+async fn get_file_size(file_path: &Path) -> u64 {
+    fs::metadata(file_path)
+        .await
+        .map(|metadata| metadata.len())
+        .unwrap_or(0)
+}
+
 async fn build_text_response(path: &Path) -> Result<HttpResponse, Error> {
     let content = fs::read_to_string(path).await.map_err(|file_err| {
         log::error!("file could not be read {:?}", file_err);