don't bother trying to make app name configurable actually

src/main.rs

@@ -13,6 +13,8 @@ use actix_web::{
 use actix_web_actors::ws;
 use time::OffsetDateTime;
 
+const APP_NAME: &'static str = "transbeam";
+
 pub struct UploadedFile {
     name: String,
     size: usize,
@@ -43,10 +45,6 @@ fn storage_dir() -> PathBuf {
     PathBuf::from(std::env::var("STORAGE_DIR").unwrap_or_else(|_| String::from("storage")))
 }
 
-fn app_name() -> String {
-    std::env::var("APP_NAME").unwrap_or_else(|_| String::from("transbeam"))
-}
-
 #[get("/upload")]
 async fn upload_socket(
     req: HttpRequest,

src/upload.rs

@@ -167,7 +167,7 @@ impl Uploader {
                     let writer = super::zip::ZipGenerator::new(files, Box::new(writer));
                     let size = writer.total_size();
                     self.writer = Some(Box::new(writer));
-                    let download_filename = super::app_name()
+                    let download_filename = super::APP_NAME.to_owned()
                         + &now.format(FILENAME_DATE_FORMAT)?
                         + ".zip";
                     let modtime = now;