Initial commit with project setup and basic structure established.

lib/helpers/helpers.go

@@ -0,0 +1,68 @@
+package helpers
+
+import (
+	"encoding/json"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"sort"
+
+	"tea.chunkbyte.com/kato/go-worm/lib/models"
+)
+
+var Log = log.New(os.Stdout, "", log.Ldate|log.Ltime|log.Lmicroseconds)
+
+func RecoverHandler(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		defer func() {
+			if recovered := recover(); recovered != nil {
+				Log.Printf("panic %s %s: %v", r.Method, r.URL.Path, recovered)
+				WriteError(w, http.StatusInternalServerError, "internal server error")
+			}
+		}()
+		next.ServeHTTP(w, r)
+	})
+}
+
+func WriteJSON(w http.ResponseWriter, status int, value any) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.WriteHeader(status)
+	if err := json.NewEncoder(w).Encode(value); err != nil {
+		Log.Printf("write response: %v", err)
+	}
+}
+
+func WriteError(w http.ResponseWriter, status int, message string) {
+	WriteJSON(w, status, models.APIError{Error: message})
+}
+
+func Username() string {
+	user := os.Getenv("USERNAME")
+	if user == "" {
+		user = os.Getenv("USER")
+	}
+	return user
+}
+
+func LocalIPs() []string {
+	interfaces, err := net.Interfaces()
+	if err != nil {
+		return nil
+	}
+	var ips []string
+	for _, iface := range interfaces {
+		if iface.Flags&net.FlagUp == 0 || iface.Flags&net.FlagLoopback != 0 {
+			continue
+		}
+		addresses, _ := iface.Addrs()
+		for _, address := range addresses {
+			ip, _, err := net.ParseCIDR(address.String())
+			if err == nil && ip != nil {
+				ips = append(ips, ip.String())
+			}
+		}
+	}
+	sort.Strings(ips)
+	return ips
+}