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

selective-vpn-api/app/resolver/common.go

@@ -0,0 +1,60 @@
+package resolver
+
+import (
+	"hash/fnv"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+var reANSI = regexp.MustCompile(`\x1B\[[0-9;]*[A-Za-z]`)
+
+func UniqueStrings(in []string) []string {
+	seen := map[string]struct{}{}
+	var out []string
+	for _, v := range in {
+		if _, ok := seen[v]; !ok {
+			seen[v] = struct{}{}
+			out = append(out, v)
+		}
+	}
+	return out
+}
+
+func PickDNSStartIndex(host string, size int) int {
+	if size <= 1 {
+		return 0
+	}
+	h := fnv.New32a()
+	_, _ = h.Write([]byte(strings.ToLower(strings.TrimSpace(host))))
+	return int(h.Sum32() % uint32(size))
+}
+
+func StripANSI(s string) string {
+	return reANSI.ReplaceAllString(s, "")
+}
+
+func IsPrivateIPv4(ip string) bool {
+	parts := strings.Split(strings.Split(ip, "/")[0], ".")
+	if len(parts) != 4 {
+		return true
+	}
+	vals := make([]int, 4)
+	for i, p := range parts {
+		n, err := strconv.Atoi(p)
+		if err != nil || n < 0 || n > 255 {
+			return true
+		}
+		vals[i] = n
+	}
+	if vals[0] == 10 || vals[0] == 127 || vals[0] == 0 {
+		return true
+	}
+	if vals[0] == 192 && vals[1] == 168 {
+		return true
+	}
+	if vals[0] == 172 && vals[1] >= 16 && vals[1] <= 31 {
+		return true
+	}
+	return false
+}