Improve blacklist to use regex matching

common/blackList/blacklist.go

@@ -0,0 +1,55 @@
+package blackList
+
+import (
+	"fmt"
+	"os"
+	"regexp"
+	"strings"
+
+	"gemini-grc/config"
+	"gemini-grc/errors"
+	"gemini-grc/logging"
+)
+
+var Blacklist []regexp.Regexp //nolint:gochecknoglobals
+
+func LoadBlacklist() error {
+	if config.CONFIG.BlacklistPath == "" {
+		return nil
+	}
+	if Blacklist == nil {
+		data, err := os.ReadFile(config.CONFIG.BlacklistPath)
+		if err != nil {
+			Blacklist = []regexp.Regexp{}
+			return errors.NewError(fmt.Errorf("could not load Blacklist file: %w", err))
+		}
+
+		lines := strings.Split(string(data), "\n")
+
+		for _, line := range lines {
+			if line == "" || strings.HasPrefix(line, "#") {
+				continue
+			}
+			regex, err := regexp.Compile(line)
+			if err != nil {
+				return errors.NewError(fmt.Errorf("could not compile Blacklist line %s: %w", line, err))
+			}
+			Blacklist = append(Blacklist, *regex)
+
+		}
+
+		if len(lines) > 0 {
+			logging.LogInfo("Loaded %d blacklist entries", len(Blacklist))
+		}
+	}
+	return nil
+}
+
+func IsBlacklisted(u string) bool {
+	for _, v := range Blacklist {
+		if v.MatchString(u) {
+			return true
+		}
+	}
+	return false
+}