Modified public serving middleware to allow serving from filesystem

src/routes/public.rs

@@ -6,14 +6,14 @@ use axum::{
 use embeddy::Embedded;
 use hyper::{header::CONTENT_TYPE, StatusCode};
 use std::{
-    borrow::Cow,
     convert::Infallible,
-    future::{ready, Ready},
-    path::Path,
+    path::{Path, PathBuf},
     task::{Context, Poll},
 };
 use tower::Service;
 
+use crate::utils::types::BoxFuture;
+
 /// Resources embedded from the public data folder such as the
 /// dashboard static assets and the content for the ingame store.
 ///
@@ -25,63 +25,89 @@ use tower::Service;
 #[folder = "src/resources/public"]
 pub struct PublicContent;
 
+fn find_local_path(path: &str) -> Option<PathBuf> {
+    let data_path = Path::new("data/public").canonicalize().ok()?;
+    let file_path = data_path.join(path).canonicalize().ok()?;
+    // Folders outside of the data path should be ignored
+    if !file_path.starts_with(data_path) {
+        return None;
+    }
+
+    Some(file_path)
+}
+
 impl<T> Service<Request<T>> for PublicContent {
     type Response = Response;
     type Error = Infallible;
-    type Future = Ready<Result<Self::Response, Self::Error>>;
+    type Future = BoxFuture<'static, Result<Self::Response, Self::Error>>;
 
     fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
         Poll::Ready(Ok(()))
     }
 
     fn call(&mut self, req: Request<T>) -> Self::Future {
-        let mut path = req.uri().path();
-        let std_path = Path::new(path);
+        let path = req.uri().path();
+
+        // Strip the leading slash in order to match paths correctly
+        let mut path = match path.strip_prefix('/') {
+            Some(value) => value.to_string(),
+            None => path.to_string(),
+        };
+
+        let std_path = Path::new(&path);
 
         // Determine type using extension
-        let extension: Cow<'_, str> = match std_path.extension() {
+        let extension: String = match std_path.extension() {
             // Extract the extension lossily
-            Some(value) => value.to_string_lossy(),
+            Some(value) => value.to_string_lossy().to_string(),
             // Use the index file when responding to paths (For SPA dashboard support)
             None => {
-                path = "index.html";
-                Cow::Borrowed("html")
+                path = "index.html".to_string();
+                "html".to_string()
             }
         };
 
-        // Strip the leading slash in order to match paths correctly
-        let path = match path.strip_prefix('/') {
-            Some(value) => value,
-            None => path,
-        };
+        Box::pin(async move {
+            let path = path;
 
-        // Create the response message
-        let response = match Self::get(path) {
-            // File exists, serve it with its known extension
-            Some(file) => {
-                // Guess mime type from file extension
-                let mime_type: &'static str = match extension.as_ref() {
-                    "html" => "text/html",
-                    "js" | "mjs" => "text/javascript",
-                    "json" => "application/json",
-                    "woff" => "font/woff",
-                    "woff2" => "font/woff2",
-                    "webp" => "image/webp",
-                    "css" => "text/css",
-                    _ => "text/plain",
-                };
+            // Guess mime type from file extension
+            let mime_type: &'static str = match extension.as_ref() {
+                "html" => "text/html",
+                "js" | "mjs" => "text/javascript",
+                "json" => "application/json",
+                "woff" => "font/woff",
+                "woff2" => "font/woff2",
+                "webp" => "image/webp",
+                "css" => "text/css",
+                _ => "text/plain",
+            };
 
+            // File exists in public data folder server try serve that and fallback to next on failure
+            if let Some(local_path) = find_local_path(&path) {
+                if local_path.exists() && local_path.is_file() {
+                    if let Ok(contents) = tokio::fs::read(local_path).await {
+                        // Create byte reponse from the embedded file
+                        let mut response = Full::from(contents).into_response();
+                        response
+                            .headers_mut()
+                            .insert(CONTENT_TYPE, HeaderValue::from_static(mime_type));
+                        return Ok(response);
+                    }
+                }
+            }
+
+            // File exists within binary serve that
+            if let Some(contents) = Self::get(&path) {
                 // Create byte reponse from the embedded file
-                let mut response = Full::from(file).into_response();
+                let mut response = Full::from(contents).into_response();
                 response
                     .headers_mut()
                     .insert(CONTENT_TYPE, HeaderValue::from_static(mime_type));
-                response
+                return Ok(response);
             }
-            // File not found 404
-            None => StatusCode::NOT_FOUND.into_response(),
-        };
 
-        ready(Ok(response))
+            // All above failed server 404
+            Ok(StatusCode::NOT_FOUND.into_response())
+        })
     }
 }