feat: added wallet service

server/utils/general.go

@@ -0,0 +1,48 @@
+package utils
+
+import (
+	"crypto/rand"
+	"math/big"
+	"time"
+)
+
+// Generates a random integer in the range (min, max)
+func RandInt(min, max int) int {
+	n, _ := rand.Int(rand.Reader, big.NewInt(int64(max-min)))
+	return int(n.Int64()) + min
+}
+
+// Get the current time in milliseconds
+func GetCurrentTimeMillis() int64 {
+	return time.Now().UnixNano() / int64(time.Millisecond) // Convert nanoseconds to milliseconds
+}
+
+// IsAlpha checks if the string contains only alphabetic characters
+func IsAlpha(s string) bool {
+    for _, r := range s {
+        if !('a' <= r && r <= 'z') && !('A' <= r && r <= 'Z') {
+            return false
+        }
+    }
+    return true
+}
+
+// IsDigit checks if the string contains only digits
+func IsDigit(s string) bool {
+    for _, r := range s {
+        if !(r >= '0' && r <= '9') {
+            return false
+        }
+    }
+    return true
+}
+
+// IsHex checks if the string is a valid hexadecimal representation
+func IsHex(s string) bool {
+    for _, r := range s {
+        if !((r >= '0' && r <= '9') || (r >= 'a' && r <= 'f') || (r >= 'A' && r <= 'F')) {
+            return false
+        }
+    }
+    return true
+}