Pull request: * all: move internal Go packages to internal/

Merge in DNS/adguard-home from 2234-move-to-internal to master

Squashed commit of the following:

commit d26a288cabeac86f9483fab307677b1027c78524
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Fri Oct 30 12:44:18 2020 +0300

    * all: move internal Go packages to internal/

    Closes #2234.

internal/querylog/search_criteria.go

@@ -0,0 +1,142 @@
+package querylog
+
+import (
+	"strings"
+
+	"github.com/AdguardTeam/AdGuardHome/internal/dnsfilter"
+)
+
+type criteriaType int
+
+const (
+	ctDomainOrClient  criteriaType = iota // domain name or client IP address
+	ctFilteringStatus                     // filtering status
+)
+
+const (
+	filteringStatusAll      = "all"
+	filteringStatusFiltered = "filtered" // all kinds of filtering
+
+	filteringStatusBlocked             = "blocked"              // blocked or blocked services
+	filteringStatusBlockedService      = "blocked_services"     // blocked
+	filteringStatusBlockedSafebrowsing = "blocked_safebrowsing" // blocked by safebrowsing
+	filteringStatusBlockedParental     = "blocked_parental"     // blocked by parental control
+	filteringStatusWhitelisted         = "whitelisted"          // whitelisted
+	filteringStatusRewritten           = "rewritten"            // all kinds of rewrites
+	filteringStatusSafeSearch          = "safe_search"          // enforced safe search
+	filteringStatusProcessed           = "processed"            // not blocked, not white-listed entries
+)
+
+// filteringStatusValues -- array with all possible filteringStatus values
+var filteringStatusValues = []string{
+	filteringStatusAll, filteringStatusFiltered, filteringStatusBlocked,
+	filteringStatusBlockedService, filteringStatusBlockedSafebrowsing, filteringStatusBlockedParental,
+	filteringStatusWhitelisted, filteringStatusRewritten, filteringStatusSafeSearch,
+	filteringStatusProcessed,
+}
+
+// searchCriteria - every search request may contain a list of different search criteria
+// we use each of them to match the query
+type searchCriteria struct {
+	criteriaType criteriaType // type of the criteria
+	strict       bool         // should we strictly match (equality) or not (indexOf)
+	value        string       // search criteria value
+}
+
+// quickMatch - quickly checks if the log entry matches this search criteria
+// the reason is to do it as quickly as possible without de-serializing the entry
+func (c *searchCriteria) quickMatch(line string) bool {
+	// note that we do this only for a limited set of criteria
+
+	switch c.criteriaType {
+	case ctDomainOrClient:
+		return c.quickMatchJSONValue(line, "QH") ||
+			c.quickMatchJSONValue(line, "IP")
+	default:
+		return true
+	}
+}
+
+// quickMatchJSONValue - helper used by quickMatch
+func (c *searchCriteria) quickMatchJSONValue(line string, propertyName string) bool {
+	val := readJSONValue(line, propertyName)
+	if len(val) == 0 {
+		return false
+	}
+	val = strings.ToLower(val)
+	searchVal := strings.ToLower(c.value)
+
+	if c.strict && searchVal == val {
+		return true
+	}
+	if !c.strict && strings.Contains(val, searchVal) {
+		return true
+	}
+
+	return false
+}
+
+// match - checks if the log entry matches this search criteria
+// nolint (gocyclo)
+func (c *searchCriteria) match(entry *logEntry) bool {
+	switch c.criteriaType {
+	case ctDomainOrClient:
+		qhost := strings.ToLower(entry.QHost)
+		searchVal := strings.ToLower(c.value)
+		if c.strict && qhost == searchVal {
+			return true
+		}
+		if !c.strict && strings.Contains(qhost, searchVal) {
+			return true
+		}
+
+		if c.strict && entry.IP == c.value {
+			return true
+		}
+		if !c.strict && strings.Contains(entry.IP, c.value) {
+			return true
+		}
+
+		return false
+
+	case ctFilteringStatus:
+		res := entry.Result
+
+		switch c.value {
+		case filteringStatusAll:
+			return true
+		case filteringStatusFiltered:
+			return res.IsFiltered ||
+				res.Reason == dnsfilter.NotFilteredWhiteList ||
+				res.Reason == dnsfilter.ReasonRewrite ||
+				res.Reason == dnsfilter.RewriteEtcHosts
+		case filteringStatusBlocked:
+			return res.IsFiltered &&
+				(res.Reason == dnsfilter.FilteredBlackList ||
+					res.Reason == dnsfilter.FilteredBlockedService)
+		case filteringStatusBlockedService:
+			return res.IsFiltered && res.Reason == dnsfilter.FilteredBlockedService
+		case filteringStatusBlockedParental:
+			return res.IsFiltered && res.Reason == dnsfilter.FilteredParental
+		case filteringStatusBlockedSafebrowsing:
+			return res.IsFiltered && res.Reason == dnsfilter.FilteredSafeBrowsing
+		case filteringStatusWhitelisted:
+			return res.Reason == dnsfilter.NotFilteredWhiteList
+		case filteringStatusRewritten:
+			return res.Reason == dnsfilter.ReasonRewrite ||
+				res.Reason == dnsfilter.RewriteEtcHosts
+		case filteringStatusSafeSearch:
+			return res.IsFiltered && res.Reason == dnsfilter.FilteredSafeSearch
+
+		case filteringStatusProcessed:
+			return !(res.Reason == dnsfilter.FilteredBlackList ||
+				res.Reason == dnsfilter.FilteredBlockedService ||
+				res.Reason == dnsfilter.NotFilteredWhiteList)
+
+		default:
+			return false
+		}
+	}
+
+	return false
+}