fix bug with response body, add test for download hash

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Libcurl.js Changelog:
 
+## v0.6.20 (11/10/24):
+- Fix bug with response body getting corrupted
+
 ## v0.6.19 (11/1/24):
 - Improve download speeds even more by reducing memory copies 
 - Fix wrong mime type being reported in response blob

README.md

@@ -86,8 +86,8 @@ If you are using the single file version (`libcurl_full.js`), the `libcurl.load_
 
 Alternatively, prebuilt versions can be found on NPM and jsDelivr. You can use the [following URLs](https://cdn.jsdelivr.net/npm/libcurl.js@latest/) to load libcurl.js from a third party CDN.
 ```
-https://cdn.jsdelivr.net/npm/libcurl.js@0.6.7/libcurl.js
+https://cdn.jsdelivr.net/npm/libcurl.js@0.6.20/libcurl.js
-https://cdn.jsdelivr.net/npm/libcurl.js@0.6.7/libcurl.wasm
+https://cdn.jsdelivr.net/npm/libcurl.js@0.6.20/libcurl.wasm
 ```
 
 To know when libcurl.js has finished loading, you can use the `libcurl_load` DOM event. The `libcurl_abort` event will trigger if the Emscripten runtime gets aborted due to a critical error. The `libcurl.events` object contains an `EventTarget` where these events will also be emitted. 

client/javascript/session.js

@@ -41,7 +41,8 @@ class CurlSession {
 
   data_callback(request_id, chunk_ptr, chunk_size) {
     let data = Module.HEAPU8.subarray(chunk_ptr, chunk_ptr + chunk_size);
-    this.request_callbacks[request_id].data(data);
+    let chunk = new Uint8Array(data);
+    this.request_callbacks[request_id].data(chunk);
   }
 
   headers_callback(request_id, chunk_ptr, chunk_size) {

client/package.json

@@ -1,6 +1,6 @@
 {
   "name": "libcurl.js",
-  "version": "0.6.19",
+  "version": "0.6.20",
   "description": "A port of libcurl to WebAssembly, for proxying HTTPS requests from the browser with full TLS encryption",
   "main": "libcurl.mjs",
   "exports": {

client/tests/run_tests.py

@@ -65,5 +65,8 @@ class JSTest(unittest.TestCase):
   def test_post(self):
     self.run_test("test_post.js")
   
+  def test_download_hash(self):
+    self.run_test("test_download_hash.js")
+
 if __name__ == "__main__":
   unittest.main()

client/tests/scripts/test_download_hash.js

@@ -0,0 +1,20 @@
+//https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest#examples
+async function digestMessage(msgUint8) {
+  const hashBuffer = await window.crypto.subtle.digest("SHA-256", msgUint8); // hash the message
+  const hashArray = Array.from(new Uint8Array(hashBuffer)); // convert buffer to byte array
+  const hashHex = hashArray
+    .map((b) => b.toString(16).padStart(2, "0"))
+    .join(""); // convert bytes to hex string
+  return hashHex;
+}
+
+async function test() {
+  let url = "https://curl.se/download/curl-8.11.0.tar.gz";
+  let expected_hash = "264537d90e58d2b09dddc50944baf3c38e7089151c8986715e2aaeaaf2b8118f";
+
+  let r = await libcurl.fetch(url);
+  let msg = new Uint8Array(await r.arrayBuffer());
+  let hash = await digestMessage(msg);
+
+  assert(hash === expected_hash, "unexpected hash of downloaded data");  
+}