create a simple admin store for phone numbers

internal/utils/adminstore.go

@@ -0,0 +1,68 @@
+package utils
+
+import (
+	"bufio"
+	"os"
+	"strconv"
+)
+
+type AdminStore struct {
+	filePath string
+}
+
+// Creates a new Admin store
+func NewAdminStore(filePath string) *AdminStore {
+	return &AdminStore{filePath: filePath}
+}
+
+// Seed saves a list of phonumbers with admin privileges
+func (as *AdminStore) Seed() error {
+	adminNumbers := []int64{254705136690, 123456789012, 987654321098}
+	file, err := os.Create(as.filePath)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	writer := bufio.NewWriter(file)
+	for _, num := range adminNumbers {
+		_, err := writer.WriteString(strconv.FormatInt(num, 10) + "\n")
+		if err != nil {
+			return err
+		}
+	}
+	return writer.Flush()
+}
+
+
+func (as *AdminStore) load() ([]int64, error) {
+	file, err := os.Open(as.filePath)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	var numbers []int64
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		num, err := strconv.ParseInt(scanner.Text(), 10, 64)
+		if err != nil {
+			return nil, err
+		}
+		numbers = append(numbers, num)
+	}
+	return numbers, scanner.Err()
+}
+
+func (as *AdminStore) IsAdmin(phoneNumber int64) (bool, error) {
+	phoneNumbers, err := as.load()
+	if err != nil {
+		return false, err
+	}
+	for _, phonenumber := range phoneNumbers {
+		if phonenumber == phoneNumber {
+			return true, nil
+		}
+	}
+	return false, nil
+}