commit for publication

utils/validation.py

@@ -0,0 +1,65 @@
+
+from . import VALID, INVALID
+
+def mac_addr(addr):
+
+    VALID_MAC_CHARS = "0123456789abcdefABCDEF"
+
+    if len(addr) != 17:
+        return INVALID
+        
+    COLON_START_IDX = 2
+    COLON_STEP = 3
+    for idx in range(COLON_START_IDX, len(addr), COLON_STEP):
+        if addr[idx] != ":":
+            return INVALID
+    
+    mac_sections = addr.split(":")
+    if len(mac_sections) != 6:
+        return INVALID
+    
+    for mac_byte in mac_sections:
+        
+        if len(mac_byte) != 2:
+            return INVALID
+
+        for char in mac_byte:
+            if not char in VALID_MAC_CHARS:
+                return INVALID
+    
+    return VALID
+
+
+
+def password_strength(password):
+
+    PW_MIN_LEN = 8
+
+    if not isinstance(password, str):
+        return "Not a string"
+
+    if len(password) < PW_MIN_LEN:
+        return f"Password too short. {PW_MIN_LEN} character minimum"
+
+
+
+def text_numeric_only(text, extra_chars=""):
+    WHITELIST_CHARS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+    for char in text:
+        if not (char in WHITELIST_CHARS or char in extra_chars):
+            return INVALID
+
+    return VALID
+
+
+
+def username(username):
+    return text_numeric_only(username, extra_chars=" _-")
+
+
+def email(email):
+    return text_numeric_only(email, extra_chars=" _-@+.")
+
+
+