show webxdc messages

[cyBerta]

counterpart of https://github.com/deltachat/deltachat-android/pull/2174

• [x] create basic webxdc view, possibly derived from existing WebViewViewController, open that with /index.htmlwhen tapping on a webxdc message
• [x] intercept requests from webview and get files only via dc_msg_get_webxdc_blob(). add a special behaviour for webxdc.js that should implement the api as in https://github.com/deltachat/deltachat-android/blob/master/res/raw/webxdc.js (no need to be a separate file, we can use whatever is easy here)
• [x] use core for sending and receiving updates when the corresponding methods are called in webxdc.js
• [x] nicer in-chat-presentation with icon and app name - here, wait until that is settled on android
• [x] show app name in title bar

optional (might get into a separate PR)

• allow configuration from staging area (cmp. AttachmentManager, that requires a draft to be set much sooner)

[Simon-Laux]

• [x] deny web requests

[r10s]

deny web requests

i think, this is included in "intercept requests from webview", however, yes, it's good to have that mentioned explicitly.

[Simon-Laux]

i think, this is included in "intercept requests from webview", however, yes, it's good to have that mentioned explicitly.

It is not, the "interception" is actually creating a handler for a custom scheme, there is no way anymore to intercept web requests on iOS (according to my research of the documentation)

[Simon-Laux]

another optional point:

• [ ] option to allow for remote debugging via safari, like the option on android for debugging via chrome

though IDK if that is possible at all for not debug builds of the app, also the docs I found are outdated:

If you have a development provisioning profile installed on your device, you can even inspect the web content of any UIWebView object in your app. The name of your app will appear as a submenu under the name of your device. When debugging web content in a web view, Web Inspector behaves in the same manner as debugging web content in Safari.

https://developer.apple.com/library/archive/documentation/AppleApplications/Conceptual/Safari_Developer_Guide/GettingStarted/GettingStarted.html#//apple_ref/doc/uid/TP40007874-CH2-SW8

[Simon-Laux]

I made webxdc.js work, first I tried escaping the string to pass it to js, but my method only worked sometimes, so after wasting my time trying to figure it out without a js debugger, I just used base64 encoding 😈.

• [ ] deny web requests

Looking at the code it looks like @cyBerta already implemented it, but it might make sense to run the acid test once we have it, anyways I don't see it as blocker as we did not test it on the other platforms either. So I'll mark this as done for now

[cyBerta]

@Simon-Laux you don't need any extra remote debugging tool, it's already working out of the box. I used the approach described here so far: https://stackoverflow.com/questions/6508313/javascript-console-log-in-an-ios-uiwebview

Is that what you were looking for?