Test gcp auth ext python

Author: DylanRussell

authextension/gcp/README.rst

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+Auth extensions for python auto instrumentation.

authextension/gcp/pyproject.toml

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+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "opentelemetry-instrumentation-auth-extension"
+dynamic = ["version"]
+description = "OpenTelemetry auth extension"
+readme = "README.rst"
+license = "Apache-2.0"
+requires-python = ">=3.8"
+authors = [
+  { name = "OpenTelemetry Authors", email = "[email protected]" },
+]
+classifiers = [
+  "Development Status :: 4 - Beta",
+  "Intended Audience :: Developers",
+  "License :: OSI Approved :: Apache Software License",
+  "Programming Language :: Python",
+  "Programming Language :: Python :: 3",
+  "Programming Language :: Python :: 3.8",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
+]
+dependencies = [
+  "google-auth ~= 2.38",
+]
+
+[project.entry-points.opentelemetry_auth_header_extension]
+gcp-auth = "opentelemetry.auth.gcp:GCPAuthHeaderSetter"
+
+[tool.hatch.version]
+path = "src/opentelemetry/auth/gcp/version.py"
+
+[tool.hatch.build.targets.sdist]
+include = [
+  "/src",
+]
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/opentelemetry"]

authextension/gcp/src/opentelemetry/auth/gcp/__init__.py

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+from typing import Tuple
+
+import google.auth
+from google.auth.transport import requests
+
+from opentelemetry.exporter.otlp.proto.grpc.exporter import (
+    BaseAuthHeaderSetter,
+)
+
+
+class GCPAuthHeaderSetter(BaseAuthHeaderSetter):
+    def __init__(self):
+        self._credentials, _ = google.auth.default() # type: ignore
+        self._request = requests.Request()
+
+    def get_auth_header(self) -> Tuple[str, str]:
+        if self._credentials.expired: # type: ignore
+            self._credentials.refresh(self._request) # type: ignore
+        return ("Authorization", f"Bearer: {self._credentials.token}") # type: ignore

authextension/gcp/src/opentelemetry/auth/gcp/version.py

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+__version__ = "0.52b0.dev"