Fehler behoben

main.go

@@ -18,451 +18,363 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 Entwickelt mit Unterstützung von Claude.ai, einem KI-Assistenten von Anthropic, PBC.
 */
-package main
 
 import (
-	"bytes"
-	"crypto/md5"
 	"crypto/tls"
-	"encoding/xml"
-	"encoding/csv"
 	"fmt"
-	"io"
+	"html/template"
 	"log"
 	"net/http"
 	"os"
+	"path/filepath"
 	"strings"
-	"sync"
 	"time"
+	"unicode"
 
 	"github.com/go-ldap/ldap/v3"
-	"golang.org/x/text/encoding/charmap"
-	"golang.org/x/text/transform"
+	"gopkg.in/yaml.v2"
 )
 
-type Config struct {
-	LDAPServer   string
-	BindDN       string
-	BindPassword string
-	SearchBase   string
-	ServerPort   string
-}
-
-type AddressBook struct {
-	XMLName  xml.Name  `xml:"AddressBook"`
-	Version  string    `xml:"version,attr"`
-	PBGroups []PBGroup `xml:"pbgroup"`
-	Contacts []Contact `xml:"Contact"`
-}
-
-type PBGroup struct {
-	ID   int    `xml:"id,attr"`
-	Name string `xml:"name"`
-}
-
-type Contact struct {
-	FirstName   string  `xml:"FirstName"`
-	LastName    string  `xml:"LastName"`
-	Frequent    int     `xml:"Frequent"`
-	Phones      []Phone `xml:"Phone"`
-	Department  string  `xml:"Department,omitempty"`
-	Group       int     `xml:"Group"`
+type Person struct {
+    FirstName       string
+    LastName        string
+    Email           string
+    Department      string
+    Phones          []Phone
+    RawPhoneNumber  string
+    InternalPhone   string
+    IsContact       bool    // Neues Feld zur Unterscheidung zwischen Benutzern und Kontakten
 }
 
 type Phone struct {
-	Type         string `xml:"type,attr"`
-	PhoneNumber  string `xml:"phonenumber"`
-	AccountIndex int    `xml:"accountindex"`
+	PhoneNumber string
+	Type        string
 }
 
-type YealinkPhoneBook struct {
-	XMLName xml.Name       `xml:"YealinkIPPhoneDirectory"`
-	Entries []YealinkEntry `xml:"DirectoryEntry"`
+type Config struct {
+	PhoneRules struct {
+		Country struct {
+			Prefix         string   `yaml:"prefix"`
+			AreaCodes      []string `yaml:"area_codes"`
+			InternalPrefix string   `yaml:"internal_prefix"`
+		} `yaml:"country"`
+		InvalidNumber string `yaml:"invalid_number"`
+	} `yaml:"phone_rules"`
 }
 
-type YealinkEntry struct {
-	Name         string `xml:"Name"`
-	Telephone    string `xml:"Telephone"`
-	Mobile       string `xml:"Mobile,omitempty"`
-	OtherMobile  string `xml:"Other,omitempty"`
-}
-
-// Neue Struktur für das Contact-Format
-type ContactXML struct {
-	XMLName  xml.Name       `xml:"contacts"`
-	Contacts []ContactEntry `xml:"contact"`
-}
-
-type ContactEntry struct {
-	Name      string `xml:"name,attr"`
-	Number    string `xml:"number,attr"`
-	FirstName string `xml:"firstname,attr"`
-	LastName  string `xml:"lastname,attr"`
-	Phone     string `xml:"phone,attr"`
-	Mobile    string `xml:"mobile,attr"`
-	Email     string `xml:"email,attr"`
-	Address   string `xml:"address,attr"`
-	City      string `xml:"city,attr"`
-	State     string `xml:"state,attr"`
-	Zip       string `xml:"zip,attr"`
-	Comment   string `xml:"comment,attr"`
-	ID        string `xml:"id,attr"`
-	Info      string `xml:"info,attr"`
-	Presence  string `xml:"presence,attr"`
-	Starred   string `xml:"starred,attr"`
-	Directory string `xml:"directory,attr"`
+type LDAPConfig struct {
+	Server       string
+	Port         string
+	BindDN       string
+	BindPassword string
+	BaseDN       string
+	Filter       string
 }
 
 var (
-	err error
-	config Config
-	cache  struct {
-		grandstreamFile *os.File
-		yealinkFile     *os.File
-		contactFile     *os.File
-		hash            []byte
-		lastUpdate      time.Time
-		mutex           sync.RWMutex
-	}
+	cachedData []Person
+	lastUpdate time.Time
+	tmpl       *template.Template
+	ldapConfig LDAPConfig
+	serverPort string
+	config     Config
 )
 
+func init() {
+	loadEnvConfig()
+	loadYAMLConfig()
+	loadTemplate()
+}
+
+func loadEnvConfig() {
+	requiredEnvVars := []string{
+		"LDAP_SERVER", "LDAP_PORT", "LDAP_BIND_DN", "LDAP_BIND_PASSWORD",
+		"LDAP_BASE_DN", "LDAP_FILTER", "SERVER_PORT",
+	}
+
+	for _, envVar := range requiredEnvVars {
+		if value := os.Getenv(envVar); value == "" {
+			log.Fatalf("Required environment variable %s is not set", envVar)
+		}
+	}
+
+	ldapConfig = LDAPConfig{
+		Server:       os.Getenv("LDAP_SERVER"),
+		Port:         os.Getenv("LDAP_PORT"),
+		BindDN:       os.Getenv("LDAP_BIND_DN"),
+		BindPassword: os.Getenv("LDAP_BIND_PASSWORD"),
+		BaseDN:       os.Getenv("LDAP_BASE_DN"),
+		Filter:       os.Getenv("LDAP_FILTER"),
+	}
+
+	serverPort = os.Getenv("SERVER_PORT")
+}
+
+func loadYAMLConfig() {
+	configPath := filepath.Join("static", "config.yaml")
+	configFile, err := os.ReadFile(configPath)
+	if err != nil {
+		log.Fatalf("Failed to read config file: %v", err)
+	}
+
+	err = yaml.Unmarshal(configFile, &config)
+	if err != nil {
+		log.Fatalf("Failed to parse config file: %v", err)
+	}
+
+	validateConfig()
+}
+
+func validateConfig() {
+	if config.PhoneRules.Country.Prefix == "" ||
+		len(config.PhoneRules.Country.AreaCodes) == 0 ||
+		config.PhoneRules.Country.InternalPrefix == "" ||
+		config.PhoneRules.InvalidNumber == "" {
+		log.Fatalf("Missing required configuration in config.yaml")
+	}
+}
+
+func loadTemplate() {
+	var err error
+	tmpl, err = template.ParseFiles(filepath.Join("static", "index.html"))
+	if err != nil {
+		log.Fatalf("Failed to parse template: %v", err)
+	}
+}
+
 func main() {
-	config = Config{
-		LDAPServer:   os.Getenv("LDAP_SERVER"),
-		BindDN:       os.Getenv("BIND_DN"),
-		BindPassword: os.Getenv("BIND_PASSWORD"),
-		SearchBase:   os.Getenv("SEARCH_BASE"),
-		ServerPort:   os.Getenv("SERVER_PORT"),
-	}
+	go cacheRefresher()
 
-	if config.ServerPort == "" {
-		config.ServerPort = "8080"
-	}
+	http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))
+	http.HandleFunc("/", handler)
 
-	// Initialisiere den Cache vor dem Start des Servers
-	err = initializeCache()
-	if err != nil {
-		log.Fatalf("Fehler beim Initialisieren des Caches: %v", err)
-	}
-
-	http.HandleFunc("/phonebook.xml", grandstreamPhoneBookHandler)
-	http.HandleFunc("/yphonebook.xml", yealinkPhoneBookHandler)
-	http.HandleFunc("/Contacts.xml", contactXMLHandler)
-	http.HandleFunc("/phonebook.csv", csvExportHandler)
-
-	log.Printf("Server starting on port %s", config.ServerPort)
-	log.Fatal(http.ListenAndServe(":"+config.ServerPort, nil))
+	log.Printf("Server starting on port %s", serverPort)
+	log.Fatal(http.ListenAndServe(":"+serverPort, nil))
 }
 
-func grandstreamPhoneBookHandler(w http.ResponseWriter, r *http.Request) {
-	servePhoneBook(w, r, cache.grandstreamFile)
-}
-
-func yealinkPhoneBookHandler(w http.ResponseWriter, r *http.Request) {
-	servePhoneBook(w, r, cache.yealinkFile)
-}
-
-func contactXMLHandler(w http.ResponseWriter, r *http.Request) {
-	servePhoneBook(w, r, cache.contactFile)
-}
-
-func csvExportHandler(w http.ResponseWriter, r *http.Request) {
-	err := updateCachedXMLIfNeeded()
-	if err != nil {
-		http.Error(w, "Fehler beim Aktualisieren der Kontakte", http.StatusInternalServerError)
-		return
-	}
-
-	contacts, err := getADContacts()
-	if err != nil {
-		http.Error(w, "Fehler beim Abrufen der Kontakte", http.StatusInternalServerError)
-		return
-	}
-
-	w.Header().Set("Content-Type", "text/csv; charset=windows-1252")
-	w.Header().Set("Content-Disposition", "attachment; filename=phonebook.csv")
-
-	if err := exportToCSV(contacts, w); err != nil {
-		http.Error(w, "Fehler beim Exportieren als CSV", http.StatusInternalServerError)
-		return
+func cacheRefresher() {
+	for {
+		newData, err := fetchDataFromLDAP()
+		if err != nil {
+			log.Printf("Error refreshing cache: %v", err)
+		} else if !dataEqual(cachedData, newData) {
+			cachedData = newData
+			lastUpdate = time.Now()
+			log.Println("Cache updated")
+		}
+		time.Sleep(5 * time.Minute)
 	}
 }
 
-func servePhoneBook(w http.ResponseWriter, r *http.Request, file *os.File) {
-	err := updateCachedXMLIfNeeded()
-	if err != nil {
-		http.Error(w, "Fehler beim Aktualisieren der Kontakte", http.StatusInternalServerError)
-		return
+func dataEqual(a, b []Person) bool {
+	if len(a) != len(b) {
+		return false
 	}
-
-	cache.mutex.RLock()
-	defer cache.mutex.RUnlock()
-
-	w.Header().Set("Content-Type", "application/xml")
-	w.WriteHeader(http.StatusOK)
-
-	_, err = file.Seek(0, 0)
-	if err != nil {
-		log.Printf("Fehler beim Zurücksetzen des Datei-Offsets: %v", err)
-		http.Error(w, "Interner Serverfehler", http.StatusInternalServerError)
-		return
-	}
-
-	_, err = io.Copy(w, file)
-	if err != nil {
-		log.Printf("Fehler beim Kopieren der XML-Datei: %v", err)
+	for i := range a {
+		if !personEqual(a[i], b[i]) {
+			return false
+		}
 	}
+	return true
 }
 
-func initializeCache() error {
-	log.Println("Initialisiere Cache...")
-
-	// Führen Sie updateCachedXMLIfNeeded aus, um die Caching-Dateien zu erstellen
-	err := updateCachedXMLIfNeeded()
-	if err != nil {
-		return fmt.Errorf("Fehler beim Initialisieren des Caches: %v", err)
-	}
-
-	// Überprüfen Sie, ob alle erforderlichen Dateien erstellt wurden
-	if cache.grandstreamFile == nil || cache.yealinkFile == nil || cache.contactFile == nil {
-		return fmt.Errorf("Nicht alle erforderlichen Cache-Dateien wurden erstellt")
-	}
-
-	log.Println("Cache erfolgreich initialisiert")
-	return nil
+func personEqual(a, b Person) bool {
+	return a.FirstName == b.FirstName &&
+		a.LastName == b.LastName &&
+		a.Email == b.Email &&
+		a.InternalPhone == b.InternalPhone &&
+		a.Department == b.Department &&
+		phonesEqual(a.Phones, b.Phones)
 }
 
-func updateCachedXMLIfNeeded() error {
-	cache.mutex.Lock()
-	defer cache.mutex.Unlock()
-
-	contacts, err := getADContacts()
-	if err != nil {
-		return err
+func phonesEqual(a, b []Phone) bool {
+	if len(a) != len(b) {
+		return false
 	}
-
-	newHash := calculateHash(contacts)
-	if cache.grandstreamFile != nil && cache.yealinkFile != nil && cache.contactFile != nil && bytes.Equal(newHash, cache.hash) {
-		return nil
+	for i := range a {
+		if a[i] != b[i] {
+			return false
+		}
 	}
+	return true
+}
 
-	addressBook := AddressBook{
-		Version: "1.0",
-		PBGroups: []PBGroup{
-			{ID: 1, Name: "Blacklist"},
-			{ID: 2, Name: "Work"},
-			{ID: 3, Name: "Friend"},
-		},
-		Contacts: contacts,
-	}
+func handler(w http.ResponseWriter, r *http.Request) {
+	log.Printf("Received request for: %s", r.URL.Path)
 
-	yealinkPhoneBook := YealinkPhoneBook{
-		Entries: make([]YealinkEntry, len(contacts)),
-	}
-
-	for i, c := range contacts {
-		yealinkPhoneBook.Entries[i] = YealinkEntry{
-			Name:        c.FirstName + " " + c.LastName,
-			Telephone:   getPhoneByType(c.Phones, "Work"),
-			Mobile:      getPhoneByType(c.Phones, "Mobile"),
-			OtherMobile: getPhoneByType(c.Phones, "Home"),
+	if time.Since(lastUpdate) > 5*time.Minute {
+		newData, err := fetchDataFromLDAP()
+		if err != nil {
+			log.Printf("Error refreshing cache: %v", err)
+		} else {
+			cachedData = newData
+			lastUpdate = time.Now()
 		}
 	}
 
-	// Erstellen der Contacts.xml
-	contactXML := ContactXML{
-		Contacts: make([]ContactEntry, len(contacts)),
-	}
-
-	for i, c := range contacts {
-		contactXML.Contacts[i] = ContactEntry{
-			Name:      c.FirstName + " " + c.LastName,
-			Number:    getPhoneByType(c.Phones, "Work"),
-			FirstName: c.FirstName,
-			LastName:  c.LastName,
-			Phone:     getPhoneByType(c.Phones, "Work"),
-			Mobile:    getPhoneByType(c.Phones, "Mobile"),
-			Presence:  "0",
-			Starred:   "0",
-			Directory: "0",
-		}
-	}
-
-	if err := saveToTempFile(&addressBook, &cache.grandstreamFile); err != nil {
-		return fmt.Errorf("Fehler beim Speichern der Grandstream-XML: %v", err)
-	}
-
-	if err := saveToTempFile(&yealinkPhoneBook, &cache.yealinkFile); err != nil {
-		return fmt.Errorf("Fehler beim Speichern der Yealink-XML: %v", err)
-	}
-
-	if err := saveToTempFile(&contactXML, &cache.contactFile); err != nil {
-		return fmt.Errorf("Fehler beim Speichern der Contact-XML: %v", err)
-	}
-
-	csvFile, err := os.OpenFile("phonebook.csv", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
+	err := tmpl.Execute(w, cachedData)
 	if err != nil {
-		return fmt.Errorf("Fehler beim Erstellen der CSV-Datei: %v", err)
+		http.Error(w, err.Error(), http.StatusInternalServerError)
 	}
-	defer csvFile.Close()
-
-	if err := exportToCSV(contacts, csvFile); err != nil {
-		return fmt.Errorf("Fehler beim Exportieren als CSV: %v", err)
-	}
-
-	cache.hash = newHash
-	cache.lastUpdate = time.Now()
-
-	return nil
 }
 
-func saveToTempFile(data interface{}, file **os.File) error {
-	tempFile, err := os.CreateTemp("", "phonebook_*.xml")
+func fetchDataFromLDAP() ([]Person, error) {
+	l, err := ldap.DialTLS("tcp", ldapConfig.Server+":"+ldapConfig.Port, &tls.Config{InsecureSkipVerify: true})
 	if err != nil {
-		return fmt.Errorf("Fehler beim Erstellen der temporären Datei: %v", err)
-	}
-
-	enc := xml.NewEncoder(tempFile)
-	enc.Indent("", "  ")
-	if err := enc.Encode(data); err != nil {
-		tempFile.Close()
-		os.Remove(tempFile.Name())
-		return fmt.Errorf("Fehler beim Kodieren der XML: %v", err)
-	}
-
-	if *file != nil {
-		(*file).Close()
-		os.Remove((*file).Name())
-	}
-
-	*file = tempFile
-	return nil
-}
-
-func calculateHash(contacts []Contact) []byte {
-	h := md5.New()
-	for _, contact := range contacts {
-		io.WriteString(h, contact.FirstName)
-		io.WriteString(h, contact.LastName)
-		for _, phone := range contact.Phones {
-			io.WriteString(h, phone.PhoneNumber)
-		}
-	}
-	return h.Sum(nil)
-}
-
-func getADContacts() ([]Contact, error) {
-	l, err := ldap.DialTLS("tcp", config.LDAPServer+":636", &tls.Config{InsecureSkipVerify: true})
-	if err != nil {
-		return nil, fmt.Errorf("LDAP-Verbindung fehlgeschlagen: %v", err)
+		return nil, fmt.Errorf("failed to connect to LDAP server: %v", err)
 	}
 	defer l.Close()
 
-	err = l.Bind(config.BindDN, config.BindPassword)
+	err = l.Bind(ldapConfig.BindDN, ldapConfig.BindPassword)
 	if err != nil {
-		return nil, fmt.Errorf("LDAP-Bindung fehlgeschlagen: %v", err)
+		return nil, fmt.Errorf("failed to bind to LDAP server: %v", err)
 	}
 
-	// Erweiterter LDAP-Filter für Benutzer und Kontakte
-	searchFilter := "(&(|(objectClass=user)(objectClass=contact))(|(telephoneNumber=*)(otherTelephone=*)(mobile=*)(homePhone=*))(!(userAccountControl:1.2.840.113556.1.4.803:=2)))"
+	// Erweitere den Filter, um sowohl Benutzer als auch Kontakte einzuschließen
+	combinedFilter := fmt.Sprintf("(|(objectClass=user)(objectClass=contact)%s)", ldapConfig.Filter)
 
 	searchRequest := ldap.NewSearchRequest(
-		config.SearchBase,
+		ldapConfig.BaseDN,
 		ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
-		searchFilter,
-		[]string{"givenName", "sn", "displayName", "telephoneNumber", "otherTelephone", "mobile", "homePhone"},
+		combinedFilter,
+		[]string{"objectClass", "givenName", "sn", "mail", "telephoneNumber", "mobile", "otherTelephone", "physicalDeliveryOfficeName"},
 		nil,
 	)
 
 	sr, err := l.Search(searchRequest)
 	if err != nil {
-		return nil, fmt.Errorf("LDAP-Suche fehlgeschlagen: %v", err)
+		return nil, fmt.Errorf("failed to search LDAP server: %v", err)
 	}
 
-	var contacts []Contact
+	var people []Person
 	for _, entry := range sr.Entries {
-		firstName := entry.GetAttributeValue("givenName")
-		lastName := entry.GetAttributeValue("sn")
-
-		if firstName == "" || lastName == "" {
+		if !isValidEntry(entry) {
 			continue
 		}
 
-		phone := formatPhoneNumber(entry.GetAttributeValue("telephoneNumber"))
-		otherMobile := formatPhoneNumber(entry.GetAttributeValue("otherMobile"))
-		mobile := formatPhoneNumber(entry.GetAttributeValue("mobile"))
+		isContact := isContactObject(entry)
 
-		if isExcludedNumber(phone) || isExcludedNumber(otherMobile) || isExcludedNumber(mobile) {
-			continue
+		person := Person{
+			FirstName:  entry.GetAttributeValue("givenName"),
+			LastName:   entry.GetAttributeValue("sn"),
+			Email:      entry.GetAttributeValue("mail"),
+			Department: entry.GetAttributeValue("physicalDeliveryOfficeName"),
+			IsContact:  isContact,
 		}
 
-		if phone != "" || otherMobile != "" || mobile != "" {
-			contact := Contact{
-				FirstName: firstName,
-				LastName:  lastName,
-				Phones:    []Phone{},
-				Group:     2, // Standardmäßig zur "Work"-Gruppe hinzufügen
+		officePhone := entry.GetAttributeValue("telephoneNumber")
+		mobilePhone := entry.GetAttributeValue("mobile")
+
+		// Normalisiere die Telefonnummern für den Vergleich
+		normalizedOffice := normalizePhoneNumber(officePhone)
+		normalizedMobile := normalizePhoneNumber(mobilePhone)
+
+		if normalizedOffice == normalizedMobile && mobilePhone != "" {
+			formattedMobile := formatPhoneNumber(mobilePhone)
+			person.Phones = append(person.Phones, Phone{PhoneNumber: formattedMobile, Type: "Mobil"})
+			person.RawPhoneNumber = formattedMobile
+			person.InternalPhone = "" // Keine interne Rufnummer für Mobiltelefone
+		} else if officePhone != "" {
+			formattedPhone := formatPhoneNumber(officePhone)
+			person.Phones = append(person.Phones, Phone{PhoneNumber: formattedPhone, Type: "Office"})
+			person.InternalPhone = extractInternalNumber(officePhone)
+			person.RawPhoneNumber = formattedPhone
+
+			if mobilePhone != "" && normalizedOffice != normalizedMobile {
+				formattedMobile := formatPhoneNumber(mobilePhone)
+				person.Phones = append(person.Phones, Phone{PhoneNumber: formattedMobile, Type: "Mobil"})
 			}
-			if phone != "" {
-				contact.Phones = append(contact.Phones, Phone{Type: "Work", PhoneNumber: phone, AccountIndex: 0})
-			}
-			if mobile != "" {
-				contact.Phones = append(contact.Phones, Phone{Type: "Mobile", PhoneNumber: mobile, AccountIndex: 0})
-			}
-			if otherMobile != "" {
-				contact.Phones = append(contact.Phones, Phone{Type: "Home", PhoneNumber: otherMobile, AccountIndex: 0})
-			}
-			contacts = append(contacts, contact)
+		} else if mobilePhone != "" {
+			formattedMobile := formatPhoneNumber(mobilePhone)
+			person.Phones = append(person.Phones, Phone{PhoneNumber: formattedMobile, Type: "Mobil"})
+			person.RawPhoneNumber = formattedMobile
+			person.InternalPhone = "" // Keine interne Rufnummer für Mobiltelefone
+		}
+
+		for _, otherPhone := range entry.GetAttributeValues("otherTelephone") {
+			person.Phones = append(person.Phones, Phone{PhoneNumber: formatPhoneNumber(otherPhone), Type: "Other"})
+		}
+
+		if (len(person.Phones) > 0 && person.Email != "") || isContact {
+			people = append(people, person)
 		}
 	}
 
-	return contacts, nil
+	return people, nil
 }
 
-func removeDuplicateNumbers(phones []Phone) []Phone {
-	seen := make(map[string]bool)
-	result := []Phone{}
+func isValidEntry(entry *ldap.Entry) bool {
+	firstName := entry.GetAttributeValue("givenName")
+	lastName := entry.GetAttributeValue("sn")
+	telephoneNumber := entry.GetAttributeValue("telephoneNumber")
+	mobile := entry.GetAttributeValue("mobile")
 
-	for _, phone := range phones {
-		if !seen[phone.PhoneNumber] {
-			seen[phone.PhoneNumber] = true
-			result = append(result, phone)
-		} else if phone.Type == "Work" {
-			// Wenn die Nummer bereits gesehen wurde und dies die "Work" Nummer ist,
-			// ersetzen wir die vorherige (wahrscheinlich "Mobile") mit dieser.
-			for i, p := range result {
-				if p.PhoneNumber == phone.PhoneNumber {
-					result[i] = phone
-					break
-				}
-			}
-		}
-	}
+	// Für Kontakte erlauben wir auch Einträge ohne Telefonnummer
+	isContact := isContactObject(entry)
 
-	return result
+	return (firstName != "" && lastName != "") && 
+	       (isContact || telephoneNumber != config.PhoneRules.InvalidNumber || mobile != "")
 }
 
-func isExcludedNumber(number string) bool {
-	excludedNumbers := []string{
-		"+49 5331 89",
-		"+49533189",
-		"+ 49 5331 89",
-	}
-
-	// Zuerst prüfen wir auf die ausgeschlossenen Nummern
-	for _, excluded := range excludedNumbers {
-		if strings.Contains(number, excluded) {
+func isContactObject(entry *ldap.Entry) bool {
+	objectClasses := entry.GetAttributeValues("objectClass")
+	for _, class := range objectClasses {
+		if strings.ToLower(class) == "contact" {
 			return true
 		}
 	}
-
-	// Dann prüfen wir, ob die Nummer mit "089" endet
-	if len(number) >= 3 && number[len(number)-3:] == "089" {
-		return true
-	}
-
-	// Wenn keine der obigen Bedingungen zutrifft, ist die Nummer nicht ausgeschlossen
 	return false
 }
 
-func
+func isValidContact(entry *ldap.Entry) bool {
+	firstName := entry.GetAttributeValue("givenName")
+	lastName := entry.GetAttributeValue("sn")
+	telephoneNumber := entry.GetAttributeValue("telephoneNumber")
+
+	return firstName != "" && lastName != "" && telephoneNumber != config.PhoneRules.InvalidNumber
+}
+
+func formatPhoneNumber(number string) string {
+	// Entferne alle Nicht-Ziffern
+	digits := strings.Map(func(r rune) rune {
+		if unicode.IsDigit(r) {
+			return r
+		}
+		return -1
+	}, number)
+
+	// Entferne führende Nullen
+	digits = strings.TrimLeft(digits, "0")
+
+	// Entferne den Länderprefix, falls vorhanden
+	countryPrefix := config.PhoneRules.Country.Prefix
+	if strings.HasPrefix(digits, countryPrefix) {
+		digits = digits[len(countryPrefix):]
+	}
+
+	// Füge eine führende "0" hinzu, wenn nicht vorhanden
+	if !strings.HasPrefix(digits, "0") {
+		digits = "0" + digits
+	}
+
+	return digits
+}
+
+func extractInternalNumber(phoneNumber string) string {
+	digits := formatPhoneNumber(phoneNumber)
+
+	for _, areaCode := range config.PhoneRules.Country.AreaCodes {
+		if strings.HasPrefix(digits[1:], areaCode) { // Ignoriere die führende 0
+			remaining := digits[1+len(areaCode):]
+			if strings.HasPrefix(remaining, config.PhoneRules.Country.InternalPrefix) {
+				return remaining[len(config.PhoneRules.Country.InternalPrefix):]
+			}
+		}
+	}
+
+	return ""
+}
+
+func normalizePhoneNumber(number string) string {
+	return formatPhoneNumber(number)
+}