webxdc: .wasm files don't work

[WofWca]

I get this error:

Failed to execute 'compile' on 'WebAssembly': Incorrect response MIME type. Expected 'application/wasm'.

Responsible code:

deltachat-android/src/org/thoughtcrime/securesms/WebxdcActivity.java

Lines 237 to 246 in c4a4469

	String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(ext);
	if (mimeType == null) {
	switch (ext) {
	case "js": mimeType = "text/javascript"; break;
	default: mimeType = "application/octet-stream"; Log.i(TAG, "unknown mime type for " + rawUrl); break;
	}
	}
	String encoding = mimeType.startsWith("text/")? "UTF-8" : null;
	InputStream targetStream = new ByteArrayInputStream(blob);
	res = new WebResourceResponse(mimeType, encoding, targetStream);

In DC Desktop there is no MIME type "white-list"
Here's the relevant Desktop code:
https://github.com/deltachat/deltachat-desktop/blob/5accdc9718ebd93461c38e346daa518e2096364f/src/main/deltachat/webxdc.ts#L145-L192

Test file (rename to .xdc): doom.zip

Related: webxdc/webxdc-test#15

[r10s]

In DC Desktop there is no MIME type "white-list"

imu, also on android, there is no "White List": it just seems as if getMimeTypeFromExtension() does not recognise the correct mime type and we do not post-fix that and return .wasm and .wat as application/octet-stream (what would be the correct type?)

for doom.zip: that also does not work in a browser (tested firefox/mac and chrome/mac) - if not yet done, we should also add a test for .wasm and .wat to webxdc-test (webxdc/webxdc-test#15 generates on the fly but does not referece a file)

[WofWca]

imu, also on android, there is no "White List"

Whoops, you're right, I missed the if condition.

for doom.zip: that also does not work in a browser

Huh? How did you test? It works for me, with python3 -m http.server.

what would be the correct type?

The error implies that it's supposed to be 'application/wasm', which is the case for python3 -m http.server.

[r10s]

Huh? How did you test? It works for me, with python3 -m http.server.

i just opened index.html from the .xdc in a browser - usually, that should work (maybe in this case not as again the mime type is wrong)

[r10s]

i created a pr, #2636, CI should create and .apk that can be used for testing.

as doom.xdc is too large, please also add a little thing to webxdc-test.xdc - the current test does not involve .wasm files - then we can also check this on iOS, on xmpp etc.

[r10s]

closed by #2636

for the missing test in webxdc-test i created webxdc/webxdc-test#20 and assigned @WofWca - @WofWca if you cannot add the test for whatever reason, please un-assign yourself