store metadata per user. remove primaryid. only store isbn13

oml/meta/utils.py

@@ -6,6 +6,16 @@ import re
 import stdnum.isbn
 
 import ox
+import ox.iso
+
+def to_isbn13(isbn):
+    try:
+        isbn = stdnum.isbn.validate(isbn, True)
+        if isbn[:2] != '97':
+            isbn = None
+    except:
+        isbn = None
+    return isbn
 
 def normalize_isbn(value):
     return ''.join([s for s in value if s.isdigit() or s == 'X'])
@@ -13,14 +23,11 @@ def normalize_isbn(value):
 def find_isbns(text):
     if isinstance(text, bytes):
         text = text.decode()
-    matches = re.compile('\d[\d\-X\ ]+').findall(text)
+    matches = re.compile('\d[\d\-X\u2013\ ]+').findall(text)
     matches = [normalize_isbn(value) for value in matches]
-    return [isbn for isbn in matches if stdnum.isbn.is_valid(isbn)
-        and len(isbn) in (10, 13)
-        and isbn not in (
-        '0' * 10,
-        '0' * 13,
-    )]
+    matches = [to_isbn13(value) for value in matches]
+    matches = list(set([value for value in matches if value]))
+    return matches
 
 def get_language(lang):
     return ox.iso.codeToLang(lang.split('-')[0]) or lang