implement sharemetadata, fixes 165

oml/utils.py

@@ -2,18 +2,19 @@
 # vi:si:et:sw=4:sts=4:ts=4
 
 
-import os
-import sys
-from PIL import Image
-from io import StringIO, BytesIO
-import re
-import stdnum.isbn
-import socket
-import time
-import hashlib
 from datetime import datetime
-import subprocess
+from io import StringIO, BytesIO
+from PIL import Image
 import base64
+import hashlib
+import json
+import os
+import re
+import socket
+import stdnum.isbn
+import subprocess
+import sys
+import time
 
 import ox
 from OpenSSL.crypto import (
@@ -391,3 +392,13 @@ def get_ratio(data):
         return img.size[0]/img.size[1]
     except:
         return 1
+
+
+def get_meta_hash(data):
+    if 'sharemetadata' in data:
+        del data['sharemetadata']
+    for key in list(data):
+        if not data[key]:
+            del data[key]
+    return hashlib.sha1(json.dumps(data,
+        ensure_ascii=False, sort_keys=True).encode()).hexdigest()