feat(uti): Statistics - base64 encoded url

Change-Id: Iab6d5c62ab35778127bb328a032a63cd7c21d0bd
Signed-off-by: Tibor Frank <tifrank@cisco.com>

1 files changed, 81 insertions, 0 deletions

diff --git a/resources/tools/dash/app/pal/data/url_processing.py b/resources/tools/dash/app/pal/data/url_processing.py
new file mode 100644
index 0000000000..e74eb41689
--- /dev/null
+++ b/resources/tools/dash/app/pal/data/url_processing.py
@@ -0,0 +1,81 @@
+# Copyright (c) 2022 Cisco and/or its affiliates.
+# 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.
+
+"""URL decoding and parsing and URL encoding.
+"""
+
+import logging
+
+from base64 import urlsafe_b64encode, urlsafe_b64decode
+from urllib.parse import urlencode, urlunparse, urlparse, parse_qs
+from zlib import compress, decompress
+from zlib import error as ZlibErr
+from binascii import Error as BinasciiErr
+
+
+def url_encode(params: dict) -> str:
+    """
+    """
+    url_params = params.get("params", None)
+    if url_params:
+        encoded_params = urlsafe_b64encode(
+            compress(urlencode(url_params).encode("utf-8"))
+        ).rstrip(b"=").decode("utf-8")
+    else:
+        encoded_params = str()
+
+    return urlunparse((
+        params.get("scheme", "http"),
+        params.get("netloc", str()),
+        params.get("path", str()),
+        str(),  # params
+        params.get("query", str()),
+        encoded_params
+    ))
+
+
+def url_decode(url: str) -> dict:
+    """
+    """
+    try:
+        parsed_url = urlparse(url)
+    except ValueError as err:
+        logging.warning(f"\nThe url {url} is not valid, ignoring.\n{repr(err)}")
+        return None
+
+    if parsed_url.fragment:
+        try:
+            padding = b"=" * (4 - (len(parsed_url.fragment) % 4))
+            params = parse_qs(decompress(
+                urlsafe_b64decode(
+                    (parsed_url.fragment.encode("utf-8") + padding)
+                )).decode("utf-8")
+            )
+        except (BinasciiErr, UnicodeDecodeError, ZlibErr) as err:
+            logging.warning(
+                f"\nNot possible to decode the parameters from url: {url}"
+                f"\nEncoded parameters: '{parsed_url.fragment}'"
+                f"\n{repr(err)}"
+            )
+            return None
+    else:
+        params = None
+
+    return {
+        "scheme": parsed_url.scheme,
+        "netloc": parsed_url.netloc,
+        "path":  parsed_url.path,
+        "query":  parsed_url.query,
+        "fragment":  parsed_url.fragment,
+        "params": params
+    }