Exchange.parse8601 sanitized input

python/ccxt/base/exchange.py

@@ -711,7 +711,11 @@ def parse_date(timestamp = None):
             return Exchange.parse8601(timestamp)
 
     @staticmethod
-    def parse8601(timestamp):
+    def parse8601(timestamp = None):
+        if timestamp is None:
+            return timestamp
+        if not isinstance(timestamp, str):
+            return None
         yyyy = '([0-9]{4})-?'
         mm = '([0-9]{2})-?'
         dd = '([0-9]{2})(?:T|[\\s])?'
@@ -721,19 +725,22 @@ def parse8601(timestamp):
         ms = '(\\.[0-9]{1,3})?'
         tz = '(?:(\\+|\\-)([0-9]{2})\\:?([0-9]{2})|Z)?'
         regex = r'' + yyyy + mm + dd + h + m + s + ms + tz
-        match = re.search(regex, timestamp, re.IGNORECASE)
-        yyyy, mm, dd, h, m, s, ms, sign, hours, minutes = match.groups()
-        ms = ms or '.000'
-        msint = int(ms[1:])
-        sign = sign or ''
-        sign = int(sign + '1')
-        hours = int(hours or 0) * sign
-        minutes = int(minutes or 0) * sign
-        offset = datetime.timedelta(hours=hours, minutes=minutes)
-        string = yyyy + mm + dd + h + m + s + ms + 'Z'
-        dt = datetime.datetime.strptime(string, "%Y%m%d%H%M%S.%fZ")
-        dt = dt + offset
-        return calendar.timegm(dt.utctimetuple()) * 1000 + msint
+        try:
+            match = re.search(regex, timestamp, re.IGNORECASE)
+            yyyy, mm, dd, h, m, s, ms, sign, hours, minutes = match.groups()
+            ms = ms or '.000'
+            msint = int(ms[1:])
+            sign = sign or ''
+            sign = int(sign + '1')
+            hours = int(hours or 0) * sign
+            minutes = int(minutes or 0) * sign
+            offset = datetime.timedelta(hours=hours, minutes=minutes)
+            string = yyyy + mm + dd + h + m + s + ms + 'Z'
+            dt = datetime.datetime.strptime(string, "%Y%m%d%H%M%S.%fZ")
+            dt = dt + offset
+            return calendar.timegm(dt.utctimetuple()) * 1000 + msint
+        except (TypeError, OverflowError, OSError, ValueError, AttributeError):
+            return None
 
     @staticmethod
     def hash(request, algorithm='md5', digest='hex'):