Add first version of gemini-grc.

gemini/blacklist.go

@@ -0,0 +1,50 @@
+package gemini
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"gemini-grc/config"
+	"gemini-grc/logging"
+)
+
+var Blacklist *[]string //nolint:gochecknoglobals
+
+func LoadBlacklist() {
+	if Blacklist == nil {
+		data, err := os.ReadFile(config.CONFIG.BlacklistPath)
+		if err != nil {
+			Blacklist = &[]string{}
+			logging.LogWarn("Could not load Blacklist file: %v", err)
+			return
+		}
+		lines := strings.Split(string(data), "\n")
+
+		// Ignore lines starting with '#' (comments)
+		filteredLines := func() []string {
+			out := make([]string, 0, len(lines))
+			for _, line := range lines {
+				if !strings.HasPrefix(line, "#") {
+					out = append(out, line)
+				}
+			}
+			return out
+		}()
+
+		if len(lines) > 0 {
+			Blacklist = &filteredLines
+			logging.LogInfo("Blacklist has %d entries", len(*Blacklist))
+		}
+	}
+}
+
+func IsBlacklisted(url URL) bool {
+	hostWithPort := fmt.Sprintf("%s:%d", url.Hostname, url.Port)
+	for _, v := range *Blacklist {
+		if v == url.Hostname || v == hostWithPort {
+			return true
+		}
+	}
+	return false
+}