Implemented mining zone screen. Added a lot of user input checks.

src/utils.rs

@@ -19,6 +19,38 @@ pub fn from_hex(string: &str) -> Result<Vec<u8>, num::ParseIntError> {
         .collect()
 }
 
+pub fn check_domain(name: &str, allow_dots: bool) -> bool {
+    if name.starts_with('.') || name.starts_with('-') || name.ends_with('.') || name.ends_with('-') {
+        return false;
+    }
+    let mut last_dot = false;
+    let mut last_hyphen = false;
+    for char in name.chars() {
+        if allow_dots && char == '.' {
+            if last_dot {
+                return false;
+            } else {
+                last_dot = true;
+                continue;
+            }
+        }
+        if char == '-' {
+            if last_hyphen {
+                return false;
+            } else {
+                last_hyphen = true;
+                continue;
+            }
+        }
+        last_dot = false;
+        last_hyphen = false;
+        if !char.is_alphanumeric() {
+            return false;
+        }
+    }
+    true
+}
+
 fn split_n(s: &str, n: usize) -> Vec<&str> {
     (0..=(s.len() - n + 1) / 2)
         .map(|i| &s[2 * i..2 * i + n])
@@ -53,4 +85,24 @@ pub fn random_string(length: usize) -> String {
         result.push(c);
     }
     result
+}
+
+#[cfg(test)]
+mod test {
+    use crate::check_domain;
+
+    #[test]
+    fn test_check_domain() {
+        assert!(check_domain("abc0", false));
+        assert!(!check_domain("ab.c", false));
+        assert!(check_domain("a.b.c", true));
+        assert!(!check_domain("ab..c", true));
+        assert!(check_domain("a-b.c", true));
+        assert!(!check_domain("a--b.c", true));
+        assert!(check_domain("a-0-b.c", true));
+        assert!(!check_domain("-ab.c", true));
+        assert!(!check_domain("ab.c-", true));
+        assert!(!check_domain(".ab.c", true));
+        assert!(!check_domain("ab.c-", true));
+    }
 }