Pull request 2303: AGDNS-2505-upd-next

Squashed commit of the following:

commit 586b0eb180afc22d06d673756dd916c17a173361
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Nov 12 19:58:56 2024 +0300

    next: upd more

commit d729aa150f7ac367255830cceca40b8880c51015
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Nov 12 16:53:15 2024 +0300

    next/websvc: upd more

commit 0c64e6cfc66b9212f077b2de7450586fd4d02802
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Nov 11 21:08:51 2024 +0300

    next: upd more

commit 05eec75222360708621c99d3eeac7c8d9f2a5080
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Nov 8 19:20:02 2024 +0300

    next: upd code

internal/next/websvc/route.go

@@ -0,0 +1,73 @@
+package websvc
+
+import (
+	"log/slog"
+	"net/http"
+
+	"github.com/AdguardTeam/golibs/netutil/httputil"
+)
+
+// Path pattern constants.
+const (
+	PathPatternFrontend       = "/"
+	PathPatternHealthCheck    = "/health-check"
+	PathPatternV1SettingsAll  = "/api/v1/settings/all"
+	PathPatternV1SettingsDNS  = "/api/v1/settings/dns"
+	PathPatternV1SettingsHTTP = "/api/v1/settings/http"
+	PathPatternV1SystemInfo   = "/api/v1/system/info"
+)
+
+// Route pattern constants.
+const (
+	routePatternFrontend            = http.MethodGet + " " + PathPatternFrontend
+	routePatternGetV1SettingsAll    = http.MethodGet + " " + PathPatternV1SettingsAll
+	routePatternGetV1SystemInfo     = http.MethodGet + " " + PathPatternV1SystemInfo
+	routePatternHealthCheck         = http.MethodGet + " " + PathPatternHealthCheck
+	routePatternPatchV1SettingsDNS  = http.MethodPatch + " " + PathPatternV1SettingsDNS
+	routePatternPatchV1SettingsHTTP = http.MethodPatch + " " + PathPatternV1SettingsHTTP
+)
+
+// route registers all necessary handlers in mux.
+func (svc *Service) route(mux *http.ServeMux) {
+	routes := []struct {
+		handler http.Handler
+		pattern string
+		isJSON  bool
+	}{{
+		handler: httputil.HealthCheckHandler,
+		pattern: routePatternHealthCheck,
+		isJSON:  false,
+	}, {
+		handler: http.FileServer(http.FS(svc.frontend)),
+		pattern: routePatternFrontend,
+		isJSON:  false,
+	}, {
+		handler: http.HandlerFunc(svc.handleGetSettingsAll),
+		pattern: routePatternGetV1SettingsAll,
+		isJSON:  true,
+	}, {
+		handler: http.HandlerFunc(svc.handlePatchSettingsDNS),
+		pattern: routePatternPatchV1SettingsDNS,
+		isJSON:  true,
+	}, {
+		handler: http.HandlerFunc(svc.handlePatchSettingsHTTP),
+		pattern: routePatternPatchV1SettingsHTTP,
+		isJSON:  true,
+	}, {
+		handler: http.HandlerFunc(svc.handleGetV1SystemInfo),
+		pattern: routePatternGetV1SystemInfo,
+		isJSON:  true,
+	}}
+
+	logMw := httputil.NewLogMiddleware(svc.logger, slog.LevelDebug)
+	for _, r := range routes {
+		var hdlr http.Handler
+		if r.isJSON {
+			hdlr = jsonMw(r.handler)
+		} else {
+			hdlr = r.handler
+		}
+
+		mux.Handle(r.pattern, logMw.Wrap(hdlr))
+	}
+}