Add url decode for OTEL_RESOUCE_ATTRIBUTES (#3046)

Author: shalevr

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Add url decode values from OTEL_RESOURCE_ATTRIBUTES
+  ([#3046](https://github.com/open-telemetry/opentelemetry-python/pull/3046))
 - Fixed circular dependency issue with custom samplers
   ([#3026](https://github.com/open-telemetry/opentelemetry-python/pull/3026))
 - Add missing entry points for OTLP/HTTP exporter

opentelemetry-sdk/src/opentelemetry/sdk/resources/__init__.py

@@ -62,6 +62,7 @@
 import sys
 import typing
 from json import dumps
+from urllib import parse
 
 import pkg_resources
 
@@ -289,7 +290,8 @@ def detect(self) -> "Resource":
                         exc,
                     )
                     continue
-                env_resource_map[key.strip()] = value.strip()
+                value_url_decoded = parse.unquote(value.strip())
+                env_resource_map[key.strip()] = value_url_decoded
 
         service_name = os.environ.get(OTEL_SERVICE_NAME)
         if service_name:

opentelemetry-sdk/tests/resources/test_resources.py

@@ -19,6 +19,7 @@
 import uuid
 from logging import ERROR
 from unittest import mock
+from urllib import parse
 
 from opentelemetry.sdk import resources
 
@@ -492,6 +493,25 @@ def test_invalid_key_value_pairs(self):
             resources.Resource({"k": "v", "k2": "v2", "foo": "bar=baz"}),
         )
 
+    def test_multiple_with_url_decode(self):
+        detector = resources.OTELResourceDetector()
+        os.environ[
+            resources.OTEL_RESOURCE_ATTRIBUTES
+        ] = "key=value%20test%0A, key2=value+%202"
+        self.assertEqual(
+            detector.detect(),
+            resources.Resource({"key": "value test\n", "key2": "value+ 2"}),
+        )
+        self.assertEqual(
+            detector.detect(),
+            resources.Resource(
+                {
+                    "key": parse.unquote("value%20test%0A"),
+                    "key2": parse.unquote("value+%202"),
+                }
+            ),
+        )
+
     @mock.patch.dict(
         os.environ,
         {resources.OTEL_SERVICE_NAME: "test-srv-name"},