Match luketainton/template

app/main.py

@@ -1,8 +1,54 @@
-#!/usr/local/bin/python3
+#!/usr/bin/env python3
 
-def main():
-    # Commands here
-    
+"""Get 6to4 address from IPv4 address."""
 
-if __name__ == "__main__":
-    main()
+import argparse
+
+
+def parse_args():  # pragma: no cover
+    parser = argparse.ArgumentParser(description='Get 6to4 address from IPv4 address.')
+    parser.add_argument('-a', '--address', dest='address', action='store', help='IPv4 address', required=True)
+    args = parser.parse_args()
+    return args
+
+
+def ipv4_to_ipv6(ipv4):
+    ipv4Hex = ''
+    ipv6Hextet1 = '2002'
+    ipv6Hextet2 = ''
+    ipv6Hextet3 = ''
+
+    # Split input to octets
+    ipv4 = ipv4.split('.',4)
+
+    # Convert IPv4 address to hex string
+    for octet in ipv4:
+        if len(hex(int(octet))[2:])>1:
+            ipv4Hex += hex(int(octet))[2:]
+        else:
+            ipv4Hex += '0'
+            ipv4Hex += hex(int(octet))[2:]
+
+    # Split into hextets
+    for i in range(4):
+        ipv6Hextet2 += (ipv4Hex[i])
+    for i in range(4,8):
+        ipv6Hextet3 += (ipv4Hex[i])
+
+    # Convert to dec and back to remove leading zeros
+    ipv6Hextet2 = hex(int(ipv6Hextet2,16))[2:]
+    ipv6Hextet3 = hex(int(ipv6Hextet3,16))[2:]
+
+    # Form 6to4 address
+    output_6to4 = f"{ipv6Hextet1}:{ipv6Hextet2}:{ipv6Hextet3}::/128"
+    return output_6to4
+
+
+def main():  # pragma: no cover
+    ipv4 = parse_args().address
+    output = ipv4_to_ipv6(ipv4)
+    print(output)
+
+
+if __name__ == '__main__':
+    main()  # pragma: no cover