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

selective-vpn-api/app/autoloop_helpers_location.go

@@ -0,0 +1,107 @@
+package app
+
+import (
+	"encoding/json"
+	"os"
+	"strings"
+)
+
+func resolveAutoloopLocationSpec(locFile, defaultLoc string) autoloopLocationSpec {
+	raw := ""
+	if data, err := os.ReadFile(locFile); err == nil {
+		for _, ln := range strings.Split(string(data), "\n") {
+			t := strings.TrimSpace(ln)
+			if t != "" && !strings.HasPrefix(t, "#") {
+				raw = t
+				break
+			}
+		}
+	}
+	if raw == "" {
+		raw = strings.TrimSpace(defaultLoc)
+	}
+	raw = strings.TrimSpace(raw)
+	primary := raw
+	iso := ""
+	if p := strings.SplitN(raw, "|", 2); len(p) == 2 {
+		primary = strings.TrimSpace(p[0])
+		iso = strings.ToUpper(strings.TrimSpace(p[1]))
+	}
+	if primary == "" {
+		primary = strings.TrimSpace(defaultLoc)
+	}
+	if isISO2(primary) {
+		iso = strings.ToUpper(primary)
+	}
+	if iso == "" {
+		if tokens := strings.Fields(primary); len(tokens) > 0 && isISO2(tokens[0]) {
+			iso = strings.ToUpper(tokens[0])
+		}
+	}
+	if iso == "" {
+		iso = lookupISOFromLocationsCache(primary)
+	}
+	if iso == "" && isISO2(defaultLoc) {
+		iso = strings.ToUpper(strings.TrimSpace(defaultLoc))
+	}
+	return autoloopLocationSpec{
+		Primary: primary,
+		ISO:     iso,
+	}
+}
+
+func isISO2(v string) bool {
+	s := strings.TrimSpace(v)
+	if len(s) != 2 {
+		return false
+	}
+	for _, ch := range s {
+		if (ch < 'A' || ch > 'Z') && (ch < 'a' || ch > 'z') {
+			return false
+		}
+	}
+	return true
+}
+
+func lookupISOFromLocationsCache(primary string) string {
+	want := strings.ToLower(strings.TrimSpace(primary))
+	if want == "" {
+		return ""
+	}
+
+	var disk struct {
+		Locations []struct {
+			ISO    string `json:"iso"`
+			Label  string `json:"label"`
+			Target string `json:"target"`
+		} `json:"locations"`
+	}
+	data, err := os.ReadFile(vpnLocationsCachePath)
+	if err != nil {
+		return ""
+	}
+	if err := json.Unmarshal(data, &disk); err != nil {
+		return ""
+	}
+
+	for _, it := range disk.Locations {
+		iso := strings.ToUpper(strings.TrimSpace(it.ISO))
+		if !isISO2(iso) {
+			continue
+		}
+		target := strings.ToLower(strings.TrimSpace(it.Target))
+		if target != "" && target == want {
+			return iso
+		}
+		labelNorm := strings.ToLower(strings.TrimSpace(it.Label))
+		if labelNorm != "" {
+			if inferVPNLocationTargetFromLabel(it.Label, iso) == primary {
+				return iso
+			}
+			if strings.Contains(labelNorm, want) {
+				return iso
+			}
+		}
+	}
+	return ""
+}