Pull request 1983: 5720-wildcard-ignored-domains

Updates #5720.

Squashed commit of the following:

commit e8093c990f15e2efc496f1a04f87360825e34e96
Merge: df5413eef 28fefaff1
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Tue Sep 5 15:06:33 2023 +0300

    Merge branch 'master' into 5720-wildcard-ignored-domains

commit df5413eefeac2c7e34eb725db9e2908b5b2d08cb
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Tue Sep 5 14:49:05 2023 +0300

    confmigrate: imp docs

commit 1644d99b730cc7f22c9d75b8e990149d3ce5b32a
Merge: 9542ee161 1e4517898
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Tue Sep 5 14:23:42 2023 +0300

    Merge branch 'master' into 5720-wildcard-ignored-domains

commit 9542ee1616c1dd4bdb6ec9a2af79a2af3858a7e3
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Tue Sep 5 12:48:48 2023 +0300

    all: upd chlog

commit 183f84a7f73c7bd33669bd108076f60514ca101e
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Fri Sep 1 17:11:31 2023 +0300

    all: imp chlog

commit a704325352a577a9b6652f011b82180ec3a6e095
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Thu Aug 31 18:59:52 2023 +0300

    all: imp code

commit fe99c3b883500850399b1feb72c914ab878b3107
Merge: 7f11e9460 0182b9ec1
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Thu Aug 31 18:43:09 2023 +0300

    Merge branch 'master' into 5720-wildcard-ignored-domains

commit 7f11e94609027ed821a125d27a1ffde03f37334a
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Wed Aug 30 19:57:51 2023 +0300

    aghnet: add tests

commit f10f9190ce1064a5d03155e8b6bba61db977897b
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Wed Aug 30 18:32:07 2023 +0300

    all: add conf migration

commit a53c14df129765366966c5230dd53aa29bdd25c5
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Wed Aug 30 13:37:30 2023 +0300

    all: add ignore engine

internal/aghnet/ignore.go

@@ -0,0 +1,56 @@
+package aghnet
+
+import (
+	"strings"
+
+	"github.com/AdguardTeam/urlfilter"
+	"github.com/AdguardTeam/urlfilter/filterlist"
+	"golang.org/x/exp/slices"
+)
+
+// IgnoreEngine contains the list of rules for ignoring hostnames and matches
+// them.
+//
+// TODO(s.chzhen):  Move all urlfilter stuff to aghfilter.
+type IgnoreEngine struct {
+	// engine is the filtering engine that can match rules for ignoring
+	// hostnames.
+	engine *urlfilter.DNSEngine
+
+	// ignored is the list of rules for ignoring hostnames.
+	ignored []string
+}
+
+// NewIgnoreEngine creates a new instance of the IgnoreEngine and stores the
+// list of rules for ignoring hostnames.
+func NewIgnoreEngine(ignored []string) (e *IgnoreEngine, err error) {
+	ruleList := &filterlist.StringRuleList{
+		RulesText:      strings.ToLower(strings.Join(ignored, "\n")),
+		IgnoreCosmetic: true,
+	}
+	ruleStorage, err := filterlist.NewRuleStorage([]filterlist.RuleList{ruleList})
+	if err != nil {
+		return nil, err
+	}
+
+	return &IgnoreEngine{
+		engine:  urlfilter.NewDNSEngine(ruleStorage),
+		ignored: ignored,
+	}, nil
+}
+
+// Has returns true if IgnoreEngine matches the host.
+func (e *IgnoreEngine) Has(host string) (ignore bool) {
+	if e == nil {
+		return false
+	}
+
+	_, ignore = e.engine.Match(host)
+
+	return ignore
+}
+
+// Values returns a copy of list of rules for ignoring hostnames.
+func (e *IgnoreEngine) Values() (ignored []string) {
+	return slices.Clone(e.ignored)
+}