fix(core): convert js Map to object before serialization, closes #6078

 (#6099)

Co-authored-by: Lucas Nogueira <lucas@tauri.studio>

.changes/core-js-Map.md

@@ -0,0 +1,5 @@
+---
+"tauri": "patch"
+---
+
+Fix serialization of js `Map` when used in `invoke`.

core/tauri-runtime-wry/Cargo.toml

@@ -13,7 +13,7 @@ exclude = [ "CHANGELOG.md", "/target" ]
 readme = "README.md"
 
 [dependencies]
-wry = { git = "https://github.com/tauri-apps/wry", default-features = false, features = [ "file-drop", "protocol" ] }
+wry = { version = "0.24.1", default-features = false, features = [ "file-drop", "protocol" ] }
 tauri-runtime = { version = "0.12.1", path = "../tauri-runtime" }
 tauri-utils = { version = "1.2.1", path = "../tauri-utils" }
 uuid = { version = "1", features = [ "v4" ] }

core/tauri-runtime-wry/src/lib.rs

@@ -990,10 +990,10 @@ fn decode_path(path: PathBuf) -> PathBuf {
 impl From<FileDropEventWrapper> for FileDropEvent {
   fn from(event: FileDropEventWrapper) -> Self {
     match event.0 {
-      WryFileDropEvent::Hovered { paths, position: _ } => {
+      WryFileDropEvent::Hovered(paths) => {
         FileDropEvent::Hovered(paths.into_iter().map(decode_path).collect())
       }
-      WryFileDropEvent::Dropped { paths, position: _ } => {
+      WryFileDropEvent::Dropped(paths) => {
         FileDropEvent::Dropped(paths.into_iter().map(decode_path).collect())
       }
       // default to cancelled

core/tauri-utils/src/pattern/isolation.js

@@ -43,7 +43,7 @@
     algorithm.iv = window.crypto.getRandomValues(new Uint8Array(12))
 
     let encoder = new TextEncoder()
-    let payloadRaw = encoder.encode(JSON.stringify(data))
+    let payloadRaw = encoder.encode(__RAW_stringify_ipc_message_fn__(data))
 
     return window.crypto.subtle
       .encrypt(algorithm, aesGcmKey, payloadRaw)

core/tauri-utils/src/pattern/isolation.rs

@@ -141,6 +141,9 @@ pub struct IsolationJavascriptCodegen {
 pub struct IsolationJavascriptRuntime<'a> {
   /// The key used on the Rust backend and the Isolation Javascript
   pub runtime_aes_gcm_key: &'a [u8; 32],
+  /// The function that stringifies a IPC message.
+  #[raw]
+  pub stringify_ipc_message_fn: &'a str,
 }
 
 #[cfg(test)]

core/tauri/scripts/stringify-ipc-message-fn.js

@@ -0,0 +1,11 @@
+(function (message) {
+  return JSON.stringify(message, (_k, val) => {
+    if (val instanceof Map) {
+      let o = {};
+      val.forEach((v, k) => o[k] = v);
+      return o;
+    } else {
+      return val;
+    }
+  })
+})

core/tauri/src/app.rs

@@ -1052,7 +1052,7 @@ impl<R: Runtime> Builder<R> {
       invoke_handler: Box::new(|_| ()),
       invoke_responder: Arc::new(window_invoke_responder),
       invoke_initialization_script:
-        "Object.defineProperty(window, '__TAURI_POST_MESSAGE__', { value: (message) => window.ipc.postMessage(JSON.stringify(message)) })".into(),
+        format!("Object.defineProperty(window, '__TAURI_POST_MESSAGE__', {{ value: (message) => window.ipc.postMessage({}(message)) }})", crate::manager::STRINGIFY_IPC_MESSAGE_FN),
       on_page_load: Box::new(|_, _| ()),
       pending_windows: Default::default(),
       plugins: PluginStore::default(),

core/tauri/src/manager.rs

@@ -73,6 +73,9 @@ const WINDOW_FILE_DROP_HOVER_EVENT: &str = "tauri://file-drop-hover";
 const WINDOW_FILE_DROP_CANCELLED_EVENT: &str = "tauri://file-drop-cancelled";
 const MENU_EVENT: &str = "tauri://menu";
 
+pub(crate) const STRINGIFY_IPC_MESSAGE_FN: &str =
+  include_str!("../scripts/stringify-ipc-message-fn.js");
+
 #[derive(Default)]
 /// Spaced and quoted Content-Security-Policy hash values.
 struct CspHashStrings {
@@ -724,6 +727,7 @@ impl<R: Runtime> WindowManager<R> {
               let asset = String::from_utf8_lossy(asset.as_ref());
               let template = tauri_utils::pattern::isolation::IsolationJavascriptRuntime {
                 runtime_aes_gcm_key: &aes_gcm_key,
+                stringify_ipc_message_fn: STRINGIFY_IPC_MESSAGE_FN,
               };
               match template.render(asset.as_ref(), &Default::default()) {
                 Ok(asset) => HttpResponseBuilder::new()