New filter plugins: hashids_encode and hashids_decode (#2244)

* New filters hashids_encode and hashids_decode

* Adding changelog

* Correcting whitespace issue in vars file

* Attempt to fix integration test failures

* Correcting copyright

* Addressing initial review comments

* Updating decoded sequence return from tuple to list

* Correcting capitilization and spelling

plugins/filter/hashids.py

@@ -0,0 +1,97 @@
+# -*- coding: utf-8 -*-
+
+# Copyright: (c) 2021, Andrew Pantuso (@ajpantuso) <ajpantuso@gmail.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+from ansible.errors import (
+    AnsibleError,
+    AnsibleFilterError,
+    AnsibleFilterTypeError,
+)
+
+from ansible.module_utils.common.text.converters import to_native
+from ansible.module_utils.common.collections import is_sequence
+
+try:
+    from hashids import Hashids
+    HAS_HASHIDS = True
+except ImportError:
+    HAS_HASHIDS = False
+
+
+def initialize_hashids(**kwargs):
+    if not HAS_HASHIDS:
+        raise AnsibleError("The hashids library must be installed in order to use this plugin")
+
+    params = dict((k, v) for k, v in kwargs.items() if v)
+
+    try:
+        return Hashids(**params)
+    except TypeError as e:
+        raise AnsibleFilterError(
+            "The provided parameters %s are invalid: %s" % (
+                ', '.join(["%s=%s" % (k, v) for k, v in params.items()]),
+                to_native(e)
+            )
+        )
+
+
+def hashids_encode(nums, salt=None, alphabet=None, min_length=None):
+    """Generates a YouTube-like hash from a sequence of ints
+
+       :nums: Sequence of one or more ints to hash
+       :salt: String to use as salt when hashing
+       :alphabet: String of 16 or more unique characters to produce a hash
+       :min_length: Minimum length of hash produced
+    """
+
+    hashids = initialize_hashids(
+        salt=salt,
+        alphabet=alphabet,
+        min_length=min_length
+    )
+
+    # Handles the case where a single int is not encapsulated in a list or tuple.
+    # User convenience seems preferable to strict typing in this case
+    # Also avoids obfuscated error messages related to single invalid inputs
+    if not is_sequence(nums):
+        nums = [nums]
+
+    try:
+        hashid = hashids.encode(*nums)
+    except TypeError as e:
+        raise AnsibleFilterTypeError(
+            "Data to encode must by a tuple or list of ints: %s" % to_native(e)
+        )
+
+    return hashid
+
+
+def hashids_decode(hashid, salt=None, alphabet=None, min_length=None):
+    """Decodes a YouTube-like hash to a sequence of ints
+
+       :hashid: Hash string to decode
+       :salt: String to use as salt when hashing
+       :alphabet: String of 16 or more unique characters to produce a hash
+       :min_length: Minimum length of hash produced
+    """
+
+    hashids = initialize_hashids(
+        salt=salt,
+        alphabet=alphabet,
+        min_length=min_length
+    )
+    nums = hashids.decode(hashid)
+    return list(nums)
+
+
+class FilterModule(object):
+
+    def filters(self):
+        return {
+            'hashids_encode': hashids_encode,
+            'hashids_decode': hashids_decode,
+        }