Use external lib for main script.

ninty-codes.py

@@ -1,101 +1,41 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
+from ninty.codes import CHARSET, safe2real, get_type, parse, validate
 from ninty.example_codes import EXAMPLE_CODES
 from functools import reduce
 
 # https://www.reddit.com/r/SwitchHacks/comments/f7psrk/anatomy_of_an_eshop_card_code/
 
-CHARSET = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'
-
-def safe2real(code: str):
-    """Converts a code with unambiguous characters to the real code"""
-    code = code.upper()
-    code = code.replace('V', 'A')   # A might be confused with 4
-    code = code.replace('W', 'E')   # E might be confused with 3
-    code = code.replace('X', 'I')   # I might be confused with 1
-    code = code.replace('Y', 'O')   # O might be confused with 0
-    return code
-
-def generateChecksum(base_code, base = 30):
-    if len(base_code) != 15:
-        raise RuntimeError("Bad argument to checksum")
-    # https://www.reddit.com/r/SwitchHacks/comments/f7psrk/anatomy_of_an_eshop_card_code/fijt5d4/
-    cksum = sum(int(c, base) for c in base_code) % base
-    return CHARSET[cksum]
-
-def validate(code):
-    if len(code) != 16: return False
-    # Make uppercase if necessary, then change X and Y back to their base 33 equivalents
-    unmangled_code = safe2real(code)
-    theirs = unmangled_code[15]
-    code_type = get_type(code)
-    base = 33 if code_type == '_A_' else 30
-    mine = generateChecksum(unmangled_code[0:15], base)
-    return theirs == mine
-
-def parse(code):
-    serial = None
-    external_validator = None
-    code_type = get_type(code)
-    unmangled_code = safe2real(code)
-    if code_type == 'NUM':
-        serial = int(code[0:8])
-        external_validator = int(code[8:])
-    elif code_type == '_A_':
-        serial = int(unmangled_code[1:8], 33)
-        external_validator = int(unmangled_code[8:15], 33)
-    elif code_type == '_B_' or code_type == '_C_':
-        serial = int(unmangled_code[1:8], 30)
-        external_validator = int(unmangled_code[8:15], 30)
+import sys
+args = None
+if len(sys.argv) == 1:
+    args = EXAMPLE_CODES
+else:
+    args = sys.argv[1:]
+seen_chars = {}
+for s in args:
+    code_type = get_type(s)
+    if not code_type in seen_chars:
+        seen_chars[code_type] = set()
+    for c in s[1:]:
+        seen_chars[code_type].add(c)
+    if code_type != 'NUM':
+        valid = validate(s)
+        print('{} {}'.format(s, "☑ " if valid else "☒ "), end='')
+        if not valid:
+            print()
+            continue
+        parse(s)
     else:
-        print(" unknown card generation '%s'" % code[0])
-        return
-
-    print(" ser#: {:010d} / Ext. validator: {:010d}".format(serial, external_validator))
-
-def get_type(code: str) -> str:
-    if code[0].isnumeric():
-        return 'NUM'
-    elif code[0] == 'A':
-        return '_A_'
-    elif code[0] == 'B':
-        return '_B_'
-    elif code[0] == 'C':
-        return '_C_'
-    else:
-        return 'UNK'
-
-if __name__ == '__main__':
-    import sys
-    args = None
-    if len(sys.argv) == 1:
-        args = EXAMPLE_CODES
-    else:
-        args = sys.argv[1:]
-    seen_chars = {}
-    for s in args:
-        code_type = get_type(s)
-        if not code_type in seen_chars:
-            seen_chars[code_type] = set()
-        for c in s[1:]:
-            seen_chars[code_type].add(c)
-        if code_type != 'NUM':
-            valid = validate(s)
-            print('{} {}'.format(s, "☑ " if valid else "☒ "), end='')
-            if not valid:
-                print()
-                continue
-            parse(s)
+        print('{} ??'.format(s), end='')
+        parse(s)
+for ct, cc in seen_chars.items():
+    cc = sorted(list(cc))
+    print('Found characters in type {} codes: '.format(ct), end='')
+    for c in CHARSET:
+        if c in cc:
+            print(c, end='')
         else:
-            print('{} ??'.format(s), end='')
-            parse(s)
-    for ct, cc in seen_chars.items():
-        cc = sorted(list(cc))
-        print('Found characters in type {} codes: '.format(ct), end='')
-        for c in CHARSET:
-            if c in cc:
-                print(c, end='')
-            else:
-                print('-', end='')
-        print()
+            print('-', end='')
+    print()

ninty/codes.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 # https://www.reddit.com/r/SwitchHacks/comments/f7psrk/anatomy_of_an_eshop_card_code/