Added embed server for plugin library

- Added embeded resources server for plugin library
- Added ztnc plugin for global area network
- Added wide mode for side wrapper

example/plugins/ztnc/mod/utils/utils.go

@@ -0,0 +1,202 @@
+package utils
+
+import (
+	"errors"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+/*
+	Common
+
+	Some commonly used functions in ArozOS
+
+*/
+
+// Response related
+func SendTextResponse(w http.ResponseWriter, msg string) {
+	w.Write([]byte(msg))
+}
+
+// Send JSON response, with an extra json header
+func SendJSONResponse(w http.ResponseWriter, json string) {
+	w.Header().Set("Content-Type", "application/json")
+	w.Write([]byte(json))
+}
+
+func SendErrorResponse(w http.ResponseWriter, errMsg string) {
+	w.Header().Set("Content-Type", "application/json")
+	w.Write([]byte("{\"error\":\"" + errMsg + "\"}"))
+}
+
+func SendOK(w http.ResponseWriter) {
+	w.Header().Set("Content-Type", "application/json")
+	w.Write([]byte("\"OK\""))
+}
+
+// Get GET parameter
+func GetPara(r *http.Request, key string) (string, error) {
+	// Get first value from the URL query
+	value := r.URL.Query().Get(key)
+	if len(value) == 0 {
+		return "", errors.New("invalid " + key + " given")
+	}
+	return value, nil
+}
+
+// Get GET paramter as boolean, accept 1 or true
+func GetBool(r *http.Request, key string) (bool, error) {
+	x, err := GetPara(r, key)
+	if err != nil {
+		return false, err
+	}
+
+	// Convert to lowercase and trim spaces just once to compare
+	switch strings.ToLower(strings.TrimSpace(x)) {
+	case "1", "true", "on":
+		return true, nil
+	case "0", "false", "off":
+		return false, nil
+	}
+
+	return false, errors.New("invalid boolean given")
+}
+
+// Get POST parameter
+func PostPara(r *http.Request, key string) (string, error) {
+	// Try to parse the form
+	if err := r.ParseForm(); err != nil {
+		return "", err
+	}
+	// Get first value from the form
+	x := r.Form.Get(key)
+	if len(x) == 0 {
+		return "", errors.New("invalid " + key + " given")
+	}
+	return x, nil
+}
+
+// Get POST paramter as boolean, accept 1 or true
+func PostBool(r *http.Request, key string) (bool, error) {
+	x, err := PostPara(r, key)
+	if err != nil {
+		return false, err
+	}
+
+	// Convert to lowercase and trim spaces just once to compare
+	switch strings.ToLower(strings.TrimSpace(x)) {
+	case "1", "true", "on":
+		return true, nil
+	case "0", "false", "off":
+		return false, nil
+	}
+
+	return false, errors.New("invalid boolean given")
+}
+
+// Get POST paramter as int
+func PostInt(r *http.Request, key string) (int, error) {
+	x, err := PostPara(r, key)
+	if err != nil {
+		return 0, err
+	}
+
+	x = strings.TrimSpace(x)
+	rx, err := strconv.Atoi(x)
+	if err != nil {
+		return 0, err
+	}
+
+	return rx, nil
+}
+
+func FileExists(filename string) bool {
+	_, err := os.Stat(filename)
+	if err == nil {
+		// File exists
+		return true
+	} else if errors.Is(err, os.ErrNotExist) {
+		// File does not exist
+		return false
+	}
+	// Some other error
+	return false
+}
+
+func IsDir(path string) bool {
+	if !FileExists(path) {
+		return false
+	}
+	fi, err := os.Stat(path)
+	if err != nil {
+		log.Fatal(err)
+		return false
+	}
+	switch mode := fi.Mode(); {
+	case mode.IsDir():
+		return true
+	case mode.IsRegular():
+		return false
+	}
+	return false
+}
+
+func TimeToString(targetTime time.Time) string {
+	return targetTime.Format("2006-01-02 15:04:05")
+}
+
+// Check if given string in a given slice
+func StringInArray(arr []string, str string) bool {
+	for _, a := range arr {
+		if a == str {
+			return true
+		}
+	}
+	return false
+}
+
+func StringInArrayIgnoreCase(arr []string, str string) bool {
+	smallArray := []string{}
+	for _, item := range arr {
+		smallArray = append(smallArray, strings.ToLower(item))
+	}
+
+	return StringInArray(smallArray, strings.ToLower(str))
+}
+
+// Validate if the listening address is correct
+func ValidateListeningAddress(address string) bool {
+	// Check if the address starts with a colon, indicating it's just a port
+	if strings.HasPrefix(address, ":") {
+		return true
+	}
+
+	// Split the address into host and port parts
+	host, port, err := net.SplitHostPort(address)
+	if err != nil {
+		// Try to parse it as just a port
+		if _, err := strconv.Atoi(address); err == nil {
+			return false // It's just a port number
+		}
+		return false // It's an invalid address
+	}
+
+	// Check if the port part is a valid number
+	if _, err := strconv.Atoi(port); err != nil {
+		return false
+	}
+
+	// Check if the host part is a valid IP address or empty (indicating any IP)
+	if host != "" {
+		if net.ParseIP(host) == nil {
+			return false
+		}
+	}
+
+	return true
+}