platform: modularize api/gui, add docs-tests-web foundation, and refresh root config

selective-vpn-api/app/dns_settings_handlers_smartdns_service.go

@@ -0,0 +1,88 @@
+package app
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+	"strings"
+)
+
+// ---------------------------------------------------------------------
+// EN: `handleDNSSmartdnsService` is an HTTP handler for dns smartdns service.
+// RU: `handleDNSSmartdnsService` - HTTP-обработчик для dns smartdns service.
+// ---------------------------------------------------------------------
+func handleDNSSmartdnsService(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	var body struct {
+		Action string `json:"action"`
+	}
+	if r.Body != nil {
+		defer r.Body.Close()
+		_ = json.NewDecoder(io.LimitReader(r.Body, 1<<20)).Decode(&body)
+	}
+
+	action := strings.ToLower(strings.TrimSpace(body.Action))
+	if action == "" {
+		action = "restart"
+	}
+	switch action {
+	case "start", "stop", "restart":
+	default:
+		http.Error(w, "unknown action", http.StatusBadRequest)
+		return
+	}
+
+	res := runSmartdnsUnitAction(action)
+	mode := loadDNSMode()
+	rt := smartDNSRuntimeSnapshot()
+	writeJSON(w, http.StatusOK, map[string]any{
+		"ok":              res.OK,
+		"message":         res.Message,
+		"exitCode":        res.ExitCode,
+		"stdout":          res.Stdout,
+		"stderr":          res.Stderr,
+		"unit_state":      smartdnsUnitState(),
+		"via_smartdns":    mode.ViaSmartDNS,
+		"smartdns_addr":   mode.SmartDNSAddr,
+		"mode":            mode.Mode,
+		"runtime_nftset":  rt.Enabled,
+		"wildcard_source": rt.WildcardSource,
+	})
+}
+
+// ---------------------------------------------------------------------
+// EN: `handleSmartdnsService` is an HTTP handler for smartdns service.
+// RU: `handleSmartdnsService` - HTTP-обработчик для smartdns service.
+// ---------------------------------------------------------------------
+func handleSmartdnsService(w http.ResponseWriter, r *http.Request) {
+	switch r.Method {
+	case http.MethodGet:
+		writeJSON(w, http.StatusOK, map[string]string{"state": smartdnsUnitState()})
+	case http.MethodPost:
+		var body struct {
+			Action string `json:"action"`
+		}
+		if r.Body != nil {
+			defer r.Body.Close()
+			_ = json.NewDecoder(io.LimitReader(r.Body, 1<<20)).Decode(&body)
+		}
+
+		action := strings.ToLower(strings.TrimSpace(body.Action))
+		if action == "" {
+			action = "restart"
+		}
+		switch action {
+		case "start", "stop", "restart":
+		default:
+			http.Error(w, "unknown action", http.StatusBadRequest)
+			return
+		}
+		writeJSON(w, http.StatusOK, runSmartdnsUnitAction(action))
+	default:
+		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+	}
+}