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

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

@@ -0,0 +1,100 @@
+package dnscfg
+
+import "strings"
+
+type Upstreams struct {
+	Default1 string
+	Default2 string
+	Meta1    string
+	Meta2    string
+}
+
+type UpstreamPoolItem struct {
+	Addr    string
+	Enabled bool
+}
+
+func NormalizeUpstreamPoolItems(items []UpstreamPoolItem, normalizeUpstream func(raw string, defaultPort string) string) []UpstreamPoolItem {
+	if len(items) == 0 {
+		return nil
+	}
+	seen := map[string]struct{}{}
+	out := make([]UpstreamPoolItem, 0, len(items))
+	for _, item := range items {
+		addr := strings.TrimSpace(item.Addr)
+		if normalizeUpstream != nil {
+			addr = normalizeUpstream(addr, "53")
+		}
+		if addr == "" {
+			continue
+		}
+		if _, ok := seen[addr]; ok {
+			continue
+		}
+		seen[addr] = struct{}{}
+		out = append(out, UpstreamPoolItem{
+			Addr:    addr,
+			Enabled: item.Enabled,
+		})
+	}
+	return out
+}
+
+func UpstreamPoolFromLegacy(cfg Upstreams, normalizeUpstream func(raw string, defaultPort string) string) []UpstreamPoolItem {
+	out := []UpstreamPoolItem{
+		{Addr: cfg.Default1, Enabled: true},
+		{Addr: cfg.Default2, Enabled: true},
+		{Addr: cfg.Meta1, Enabled: true},
+		{Addr: cfg.Meta2, Enabled: true},
+	}
+	return NormalizeUpstreamPoolItems(out, normalizeUpstream)
+}
+
+func UpstreamPoolToLegacy(items []UpstreamPoolItem, defaults Upstreams, normalizeUpstream func(raw string, defaultPort string) string) Upstreams {
+	items = NormalizeUpstreamPoolItems(items, normalizeUpstream)
+	out := defaults
+	enabled := make([]string, 0, len(items))
+	for _, item := range items {
+		if !item.Enabled {
+			continue
+		}
+		addr := strings.TrimSpace(item.Addr)
+		if normalizeUpstream != nil {
+			addr = normalizeUpstream(addr, "53")
+		}
+		if addr != "" {
+			enabled = append(enabled, addr)
+		}
+	}
+	if len(enabled) > 0 {
+		out.Default1 = enabled[0]
+	}
+	if len(enabled) > 1 {
+		out.Default2 = enabled[1]
+	}
+	if len(enabled) > 2 {
+		out.Meta1 = enabled[2]
+	}
+	if len(enabled) > 3 {
+		out.Meta2 = enabled[3]
+	}
+	return out
+}
+
+func EnabledPool(items []UpstreamPoolItem, normalizeUpstream func(raw string, defaultPort string) string) []string {
+	items = NormalizeUpstreamPoolItems(items, normalizeUpstream)
+	out := make([]string, 0, len(items))
+	for _, item := range items {
+		if !item.Enabled {
+			continue
+		}
+		addr := strings.TrimSpace(item.Addr)
+		if normalizeUpstream != nil {
+			addr = normalizeUpstream(addr, "53")
+		}
+		if addr != "" {
+			out = append(out, addr)
+		}
+	}
+	return out
+}