Shorten VDU names

[osm/SO.git] / common / python / rift / mano / utils / short_name.py

diff --git a/common/python/rift/mano/utils/short_name.py b/common/python/rift/mano/utils/short_name.py
new file mode 100644 (file)
index 0000000..e4dd8a8
--- /dev/null
+++ b/common/python/rift/mano/utils/short_name.py
@@ -0,0 +1,74 @@
+#!/usr/bin/python
+
+# 
+#   Copyright 2017 RIFT.IO Inc
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+#
+# Author: Aniruddha Atale
+
+import hashlib
+import basehash
+
+
+class StringShortner(object):
+    FOLDS = 3
+    STRING_LEN=9
+    def __init__(self, string = None):
+        self._string = string
+
+    @property
+    def string(self):
+        return self._string
+
+    @string.setter
+    def string(self, string):
+        self._string = string
+
+    @property
+    def short_string(self):
+        if self._string:
+            return StringShortner._get_short_string(self._string)
+        else:
+            return str()
+
+    @staticmethod
+    def _fold_hex_series(series):
+        length = len(series)
+        result = list()
+        for i in range(int(length/2)):
+            result.append(series[i] ^ series[(length - 1) - i])
+
+        if length % 2:
+            result.append(series[int(length/2) + 1])
+
+        return result
+
+    @staticmethod
+    def _num_from_hex_series(series):
+        result = 0
+        for i in range(len(series)):
+            result = result * 256
+            result += series[i]
+        return result
+    
+    @staticmethod
+    def _get_short_string(string):
+        sha = hashlib.sha384(string.encode())
+        digest = sha.digest()
+        for i in range(StringShortner.FOLDS):
+            digest = StringShortner._fold_hex_series(digest)
+
+        number = StringShortner._num_from_hex_series(digest)
+        base62 = basehash.base62(length=StringShortner.STRING_LEN)
+        return base62.hash(number)