Pull request 1803: 5685-fix-safe-search

Updates #5685.

Squashed commit of the following:

commit 5312147abfa0914c896acbf1e88f8c8f1af90f2b
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Apr 6 14:09:44 2023 +0300

    safesearch: imp tests, logs

commit 298b5d24ce292c5f83ebe33d1e92329e4b3c1acc
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Apr 5 20:36:16 2023 +0300

    safesearch: fix filters, logging

commit 63d6ca5d694d45705473f2f0410e9e0b49cf7346
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Apr 5 20:24:47 2023 +0300

    all: dry; fix logs

commit fdbf2f364fd0484b47b3161bf6f4581856fdf47b
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Apr 5 20:01:08 2023 +0300

    all: fix safe search update

internal/home/client.go

@@ -3,8 +3,10 @@ package home
 import (
 	"encoding"
 	"fmt"
+	"time"
 
 	"github.com/AdguardTeam/AdGuardHome/internal/filtering"
+	"github.com/AdguardTeam/AdGuardHome/internal/filtering/safesearch"
 	"github.com/AdguardTeam/dnsproxy/proxy"
 )
 
@@ -45,6 +47,23 @@ func (c *Client) closeUpstreams() (err error) {
 	return nil
 }
 
+// setSafeSearch initializes and sets the safe search filter for this client.
+func (c *Client) setSafeSearch(
+	conf filtering.SafeSearchConfig,
+	cacheSize uint,
+	cacheTTL time.Duration,
+) (err error) {
+	ss, err := safesearch.NewDefault(conf, fmt.Sprintf("client %q", c.Name), cacheSize, cacheTTL)
+	if err != nil {
+		// Don't wrap the error, because it's informative enough as is.
+		return err
+	}
+
+	c.SafeSearch = ss
+
+	return nil
+}
+
 // clientSource represents the source from which the information about the
 // client has been obtained.
 type clientSource uint