fix(storage): avoid overwriting user settings for auto_decompress

Rebase of talkiq#718

Author: TheKevJames

.pre-commit-config.yaml

@@ -111,36 +111,36 @@ repos:
     name: mypy-bigquery
     additional_dependencies:
     - aiohttp==3.13.3
-    - gcloud-aio-auth==5.4.2
+    - gcloud-aio-auth==5.4.4
     - types-requests==2.32.4.20260107
     files: bigquery/
   - <<: *mypy
     name: mypy-datastore
     additional_dependencies:
     - aiohttp==3.13.3
-    - gcloud-aio-auth==5.4.2
+    - gcloud-aio-auth==5.4.4
     - types-requests==2.32.4.20260107
     files: datastore/
   - <<: *mypy
     name: mypy-kms
     additional_dependencies:
     - aiohttp==3.13.3
-    - gcloud-aio-auth==5.4.2
+    - gcloud-aio-auth==5.4.4
     - types-requests==2.32.4.20260107
     files: kms/
   - <<: *mypy
     name: mypy-pubsub
     additional_dependencies:
     - aiohttp==3.13.3
-    - gcloud-aio-auth==5.4.2
+    - gcloud-aio-auth==5.4.4
     - prometheus-client==0.24.1
     - types-requests==2.32.4.20260107
     files: pubsub/
   - <<: *mypy
     name: mypy-storage
     additional_dependencies:
     - aiohttp==3.13.3
-    - gcloud-aio-auth==5.4.2
+    - gcloud-aio-auth==5.4.4
     - rsa==4.9.1
     - types-aiofiles==25.1.0.20251011
     - types-requests==2.32.4.20260107
@@ -149,7 +149,7 @@ repos:
     name: mypy-taskqueue
     additional_dependencies:
     - aiohttp==3.13.3
-    - gcloud-aio-auth==5.4.2
+    - gcloud-aio-auth==5.4.4
     - types-requests==2.32.4.20260107
     files: taskqueue/
 - repo: https://github.com/asottile/yesqa

storage/gcloud/aio/storage/storage.py

@@ -622,14 +622,19 @@ async def _download(
         headers.update(await self._headers())
 
         # aiohttp and requests automatically decompress the body if this
-        # argument is not passed. We assume that if the Accept-Encoding header
-        # is present, then the client will handle the decompression
-        auto_decompress = 'accept-encoding' not in {k.lower() for k in headers}
+        # argument is not passed, unless a user has explicitly disabled that
+        # option at the session level in the case of aiohttp. We follow the
+        # user setting by default (by passing None) and only explicitly disable
+        # it when we know that the object is not compressed (when the
+        # Accept-Encoding header is missing).
+        auto_decompress = None
+        if 'accept-encoding' not in {k.lower() for k in headers}:
+            auto_decompress = False
 
         s = AioSession(session) if session else self.session
 
         data: bytes
-        if not auto_decompress and BUILD_GCLOUD_REST:
+        if auto_decompress is False and BUILD_GCLOUD_REST:
             # Requests lib has a different way of reading compressed data. We
             # must pass the stream=True argument and read the response using
             # the 'raw' property.

storage/poetry.lock

@@ -364,7 +364,7 @@ test = ["pytest (>=6)"]
 
 [[package]]
 name = "gcloud-rest-auth"
-version = "5.4.3"
+version = "5.4.4"
 description = "Python Client for Google Cloud Auth"
 optional = false
 python-versions = ">= 3.10, < 4.0"
@@ -682,4 +682,4 @@ zstd = ["backports-zstd (>=1.0.0) ; python_version < \"3.14\""]
 [metadata]
 lock-version = "2.1"
 python-versions = ">= 3.10, < 4.0"
-content-hash = "d7b69bb7dc20f1e0046a5ec92b531ba1ee19bfe6f0df054e1601aa194c0e2b58"
+content-hash = "bb040f27baa3c12a381ddfe8a43d67ef7c93fd774a8338b4ae6d55df4b8167f3"

storage/poetry.rest.lock

@@ -22,7 +22,7 @@ classifiers = [
 [tool.poetry.dependencies]
 python = ">= 3.10, < 4.0"
 # aiofiles = ">=0.6.0, <26.0.0"
-gcloud-rest-auth = ">= 5.3.0, < 6.0.0"
+gcloud-rest-auth = ">= 5.4.4, < 6.0.0"
 pyasn1-modules = ">=0.2.1, <0.5.0"
 rsa = ">= 3.1.4, < 5.0.0"
 

storage/pyproject.rest.toml

@@ -22,7 +22,7 @@ classifiers = [
 [tool.poetry.dependencies]
 python = ">= 3.10, < 4.0"
 aiofiles = ">=0.6.0, <26.0.0"
-gcloud-aio-auth = ">= 5.3.0, < 6.0.0"
+gcloud-aio-auth = ">= 5.4.4, < 6.0.0"
 pyasn1-modules = ">=0.2.1, <0.5.0"
 rsa = ">= 3.1.4, < 5.0.0"