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

selective-vpn-api/app/dnscfg/upstreams.go

@@ -0,0 +1,69 @@
+package dnscfg
+
+import (
+	"fmt"
+	"strings"
+)
+
+func NormalizeUpstreams(cfg Upstreams, defaults Upstreams, normalizeUpstream func(raw string, defaultPort string) string) Upstreams {
+	if normalizeUpstream != nil {
+		cfg.Default1 = normalizeUpstream(cfg.Default1, "53")
+		cfg.Default2 = normalizeUpstream(cfg.Default2, "53")
+		cfg.Meta1 = normalizeUpstream(cfg.Meta1, "53")
+		cfg.Meta2 = normalizeUpstream(cfg.Meta2, "53")
+	}
+
+	if strings.TrimSpace(cfg.Default1) == "" {
+		cfg.Default1 = defaults.Default1
+	}
+	if strings.TrimSpace(cfg.Default2) == "" {
+		cfg.Default2 = defaults.Default2
+	}
+	if strings.TrimSpace(cfg.Meta1) == "" {
+		cfg.Meta1 = defaults.Meta1
+	}
+	if strings.TrimSpace(cfg.Meta2) == "" {
+		cfg.Meta2 = defaults.Meta2
+	}
+	return cfg
+}
+
+func ParseUpstreamsConf(content string, defaults Upstreams, normalizeUpstream func(raw string, defaultPort string) string) Upstreams {
+	cfg := defaults
+	for _, ln := range strings.Split(content, "\n") {
+		s := strings.TrimSpace(ln)
+		if s == "" || strings.HasPrefix(s, "#") {
+			continue
+		}
+		parts := strings.Fields(s)
+		if len(parts) < 2 {
+			continue
+		}
+		key := strings.ToLower(strings.TrimSpace(parts[0]))
+		vals := parts[1:]
+		switch key {
+		case "default":
+			if len(vals) > 0 {
+				cfg.Default1 = vals[0]
+			}
+			if len(vals) > 1 {
+				cfg.Default2 = vals[1]
+			}
+		case "meta":
+			if len(vals) > 0 {
+				cfg.Meta1 = vals[0]
+			}
+			if len(vals) > 1 {
+				cfg.Meta2 = vals[1]
+			}
+		}
+	}
+	return NormalizeUpstreams(cfg, defaults, normalizeUpstream)
+}
+
+func RenderUpstreamsConf(cfg Upstreams) string {
+	return fmt.Sprintf(
+		"default %s %s\nmeta %s %s\n",
+		cfg.Default1, cfg.Default2, cfg.Meta1, cfg.Meta2,
+	)
+}