feat: Simplified fetch method (Rust wasm_bindgen)

wasm/prover/src/lib.rs

@@ -16,7 +16,7 @@ pub use wasm_bindgen_rayon::init_thread_pool;
 use js_sys::JSON;
 
 use wasm_bindgen_futures::JsFuture;
-use web_sys::{Request as WebsysRequest, RequestInit, Response};
+use web_sys::{Request, RequestInit, Response};
 
 // A macro to provide `println!(..)`-style syntax for `console.log` logging.
 macro_rules! log {
@@ -28,17 +28,11 @@ pub(crate) use log;
 
 extern crate console_error_panic_hook;
 
-#[wasm_bindgen]
-extern "C" {
-    #[wasm_bindgen(js_namespace = self)]
-    fn fetch(request: &web_sys::Request) -> js_sys::Promise;
-}
-
 pub async fn fetch_as_json_string(url: &str, opts: &RequestInit) -> Result<String, JsValue> {
-    let request = WebsysRequest::new_with_str_and_init(url, opts)?;
-    let promise = fetch(&request);
-    let future = JsFuture::from(promise);
-    let resp_value = future.await?;
+    let request = Request::new_with_str_and_init(url, opts)?;
+    let window = web_sys::window().expect("Window object");
+    let resp_value = JsFuture::from(window.fetch_with_request(&request)).await?;
+    assert!(resp_value.is_instance_of::<Response>());
     let resp: Response = resp_value.dyn_into()?;
     let json = JsFuture::from(resp.json()?).await?;
     let stringified = JSON::stringify(&json)?;

wasm/prover/tests/web.rs

@@ -5,7 +5,9 @@
 extern crate wasm_bindgen_test;
 use serde_json::Value;
 use std::{collections::HashMap, str};
+use wasm_bindgen::JsValue;
 use wasm_bindgen_test::*;
+use web_sys::RequestInit;
 
 extern crate tlsn_extension_rs;
 use tlsn_extension_rs::*;
@@ -18,6 +20,19 @@ macro_rules! log {
 
 wasm_bindgen_test_configure!(run_in_browser);
 
+#[wasm_bindgen_test]
+async fn test_fetch() {
+    let url = "https://swapi.info/api/";
+    let mut opts = RequestInit::new();
+    opts.method("GET");
+
+    let rust_string: String = tlsn_extension_rs::fetch_as_json_string(&url, &opts)
+        .await
+        .unwrap();
+
+    assert!(rust_string.contains("starships"));
+}
+
 #[wasm_bindgen_test]
 async fn verify() {
     let pem = str::from_utf8(include_bytes!("../../../test/assets/notary.pem")).unwrap();