Add OTI event-handler project

OTI event handler application in DCAEGEN2 platform

Change-Id: Ie64f26f851e2045f00043f90279d503c2dc62948
Issue-ID: DCAEGEN2-1910
Signed-off-by: Kotagiri, Ramprasad (rp5662) <rp5662@att.com>

1 files changed, 83 insertions, 0 deletions

diff --git a/oti/event-handler/otihandler/utils.py b/oti/event-handler/otihandler/utils.py
new file mode 100644
index 0000000..4f9dbda
--- /dev/null
+++ b/oti/event-handler/otihandler/utils.py
@@ -0,0 +1,83 @@
+# ================================================================================
+# Copyright (c) 2019-2020 AT&T Intellectual Property. All rights reserved.
+# ================================================================================
+# 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.
+# ============LICENSE_END=========================================================
+
+import base64
+import collections
+import copy
+import os
+
+from Crypto import Random
+from Crypto.Cipher import PKCS1_v1_5
+from Crypto.Hash import SHA
+from Crypto.PublicKey import RSA
+
+
+def update_dict(d, u):
+    """Recursively updates dict
+
+    Update dict d with dict u
+    """
+    for k, v in u.items():
+        if isinstance(v, collections.Mapping):
+            r = update_dict(d.get(k, {}), v)
+            d[k] = r
+        else:
+            d[k] = u[k]
+    return d
+
+def replace_token(configure_content):
+    try:
+        with open("/opt/app/config-map/dcae-k8s-cluster-token",'r') as fh:
+            dcae_token = fh.readline().rstrip('\n')
+
+        new_config = copy.deepcopy(configure_content)
+
+        # override the default-user token 
+        ix=0
+        for user in new_config['users'][:]:
+            if user['name'] == "default-user":
+                new_config['users'][ix] = {
+                    "name": "default-user",
+                    "user": {
+                        "token": dcae_token
+                    }
+                }
+            ix += 1
+
+        return new_config
+
+    except Exception as e:
+        return configure_content
+
+def decrypt(b64_ciphertext):
+    """returns decrypted b64_ciphertext that was encoded like this:
+
+    echo "cleartext" | openssl pkeyutl -encrypt -pubin -inkey rsa.pub | base64 --wrap=0
+
+    requires private key in environment variable EOMUSER_PRIVATE
+    """
+
+    if len(b64_ciphertext) <= 30:  # For transition, assume short values are not encrypted
+        return b64_ciphertext
+    
+    try:
+        ciphertext = base64.b64decode(b64_ciphertext)
+        key = RSA.importKey(os.getenv('EOMUSER_PRIVATE'))
+        cleartext = PKCS1_v1_5.new(key).decrypt(ciphertext, Random.new().read(15+SHA.digest_size))
+    except Exception as e:
+        return b64_ciphertext
+
+    return cleartext