[Webkit-unassigned] [Bug 207543] New: WKContentRuleList rules does not allow you to block ThirdParty cookies

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207543

            Bug ID: 207543
           Summary: WKContentRuleList rules does not allow you to block
                    ThirdParty cookies
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Enhancement
          Priority: P2
         Component: WebKit API
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bthomas at brave.com

Created attachment 390362

  --> https://bugs.webkit.org/attachment.cgi?id=390362&action=review

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.

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