Add cloudinary v1.11.0

lib/cloudinary/auth_token.py

@@ -0,0 +1,47 @@
+import hashlib
+import hmac
+import re
+import time
+from binascii import a2b_hex
+from cloudinary.compat import quote_plus
+
+AUTH_TOKEN_NAME = "__cld_token__"
+
+
+
+def generate(url=None, acl=None, start_time=None, duration=None, expiration=None, ip=None, key=None,
+             token_name=AUTH_TOKEN_NAME):
+
+    if expiration is None:
+        if duration is not None:
+            start = start_time if start_time is not None else int(time.mktime(time.gmtime()))
+            expiration = start + duration
+        else:
+            raise Exception("Must provide either expiration or duration")
+
+    token_parts = []
+    if ip is not None:          token_parts.append("ip=" + ip)
+    if start_time is not None:  token_parts.append("st=%d" % start_time)
+    token_parts.append("exp=%d" % expiration)
+    if acl is not None:         token_parts.append("acl=%s" % _escape_to_lower(acl))
+    to_sign = list(token_parts)
+    if url is not None:
+        to_sign.append("url=%s" % _escape_to_lower(url))
+    auth = _digest("~".join(to_sign), key)
+    token_parts.append("hmac=%s" % auth)
+    return "%(token_name)s=%(token)s" % {"token_name": token_name, "token": "~".join(token_parts)}
+
+
+def _digest(message, key):
+    bin_key = a2b_hex(key)
+    return hmac.new(bin_key, message.encode('utf-8'), hashlib.sha256).hexdigest()
+
+
+def _escape_to_lower(url):
+    escaped_url = quote_plus(url)
+
+    def toLowercase(match):
+        return match.group(0).lower()
+
+    escaped_url = re.sub(r'%..', toLowercase, escaped_url)
+    return escaped_url