shorter id generation, shorten file url

src/main.rs

@@ -19,6 +19,7 @@ use async_std::{
 };
 use file_kind::FileKind;
 use futures::TryStreamExt;
+use rand::prelude::SliceRandom;
 use sqlx::{
     postgres::{PgPool, PgPoolOptions, PgRow},
     Row,
@@ -29,6 +30,11 @@ const INDEX_HTML: &str = include_str!("../template/index.html");
 const UPLOAD_HTML: &str = include_str!("../template/upload.html");
 const VIEW_HTML: &str = include_str!("../template/view.html");
 
+const ID_CHARS: &[char] = &[
+    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v',
+    'w', 'x', 'y', 'z', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+];
+
 async fn index(req: web::HttpRequest) -> Result<HttpResponse, Error> {
     let upload_url = format!("{}/upload", get_host_url(&req));
     let index_html = INDEX_HTML.replace("{upload_url}", upload_url.as_str());
@@ -47,7 +53,7 @@ async fn upload(
     expiry_watch_sender: web::Data<Sender<()>>,
     config: web::Data<Config>,
 ) -> Result<HttpResponse, Error> {
-    let file_id = format!("{:x?}", rand::random::<u32>());
+    let file_id = gen_file_id();
     let mut filename = config.files_dir.clone();
     filename.push(&file_id);
 
@@ -108,6 +114,15 @@ async fn upload(
         .body(format!("{}\n", url)))
 }
 
+fn gen_file_id() -> String {
+    let mut rng = rand::thread_rng();
+    let mut id = String::with_capacity(5);
+    for _ in 0..5 {
+        id.push(*ID_CHARS.choose(&mut rng).expect("ID_CHARS is not empty"));
+    }
+    id
+}
+
 fn get_host_url(req: &web::HttpRequest) -> String {
     let conn = req.connection_info();
     format!("{}://{}", conn.scheme(), conn.host())
@@ -116,9 +131,9 @@ fn get_host_url(req: &web::HttpRequest) -> String {
 fn get_file_url(req: &web::HttpRequest, id: &str, name: Option<&str>) -> String {
     if let Some(name) = name {
         let encoded_name = urlencoding::encode(name);
-        format!("{}/file/{}/{}", get_host_url(req), id, encoded_name)
+        format!("{}/{}/{}", get_host_url(req), id, encoded_name)
     } else {
-        format!("{}/file/{}", get_host_url(req), id)
+        format!("{}/{}", get_host_url(req), id)
     }
 }
 
@@ -273,11 +288,11 @@ async fn main() -> std::io::Result<()> {
                     web::resource(["/upload/{id}", "/upload/{id}/{name}"])
                         .route(web::get().to(uploaded)),
                 )
+                .service(Files::new("/static", "static").disable_content_disposition())
                 .service(
-                    web::resource(["/file/{id}", "/file/{id}/{name}"])
+                    web::resource(["/{id:[a-z0-9]{5}}", "/{id:[a-z0-9]{5}}/{name}"])
                         .route(web::get().to(download)),
                 )
-                .service(Files::new("/static", "static").disable_content_disposition())
                 .default_service(web::route().to(not_found))
         }
     })