add fetch_b64 for downloading binary files in base64 format

src/main.rs

@@ -205,6 +205,20 @@ async fn file_handler(request: Request) -> impl IntoResponse {
             StatusCode::INTERNAL_SERVER_ERROR
         })?;
 
+    let fetch_b64 = lua
+        .create_function(|lua, uri: String| {
+            let resp = reqwest::blocking::get(&uri)
+                .and_then(|resp| resp.error_for_status())
+                .into_lua_err()?;
+            let bytes = resp.bytes().into_lua_err()?;
+            let b64 = BASE64_STANDARD.encode(bytes);
+            lua.to_value(&b64)
+        })
+        .map_err(|e| {
+            eprintln!("Lua Error: {:?}", e);
+            StatusCode::INTERNAL_SERVER_ERROR
+        })?;
+
     let dbg = lua
         .create_function(|_, value: LuaValue| {
             dbg!(value);
@@ -220,6 +234,11 @@ async fn file_handler(request: Request) -> impl IntoResponse {
         StatusCode::INTERNAL_SERVER_ERROR
     })?;
 
+    globals.set("fetch_b64", fetch_b64).map_err(|e| {
+        eprintln!("Lua Error: {:?}", e);
+        StatusCode::INTERNAL_SERVER_ERROR
+    })?;
+
     globals.set("dbg", dbg).map_err(|e| {
         eprintln!("Lua Error: {:?}", e);
         StatusCode::INTERNAL_SERVER_ERROR