Bug 207543 – WKContentRuleList rules does not allow you to block ThirdParty cookies

• Component: WebKit API
• Status: RESOLVED INVALID

[Brandon]

Created attachment 390362 [details]
Example where it throws an error

If you call `WKContentRuleStore.compileContentRuleList` with the rules:

```
[{
			"trigger": {
				"url-filter": ".*",
				"load-type": "thirdparty"
			},
			"action": {
				"type": "block-cookies"
			}
		}]
```

It will say `"Error Domain=WKErrorDomain Code=6 "(null)" UserInfo={NSHelpAnchor=Rule list compilation failed: Invalid trigger flags array.}"`

Because the `load-type` is set to `thirdparty` for `block-cookies` action type. Sample application uploaded.

Expected Behaviour: Should allow developers to block ThirdParty cookies using the content rules list because WKWebView's HTTPCookieStore set to `never` does NOT work.

[Radar WebKit Bug Importer]

<rdar://problem/59350850>

[Maciej Stachowiak]

Do you specifically want to do it this way, or would a WKWebView preference to block all third-party cookies (as requested elsewhere) do the trick?

(This does seem like a strange limitation. Blocking cookies for third-party loads using content blockers may be complicated by the fact that redirects can alter third-party-ness.)

[Krzysztof Jan Modras [:chrmod]]

Having a configuration option on WKWebView would work fine in Cliqz perspective. 
Would WKPreferences `thirdPartyCookiesEnabled` make sense?

[Alex Christensen]

As documented in https://developer.apple.com/documentation/safariservices/creating_a_content_blocker you need to make at least two changes:
"load-type": "thirdparty"
needs to be changed to 
"load-type": ["third-party"]