feat: Add fallback OAuth2 client configuration (#41)
Restore the fallback logic in `get_credentials()` to read from a bundled `oauth_config.json` package resource when no local config is provided or found. Add `oauth_config.json` containing default Client ID and Secret to replace the gcloud flow for users without custom configuration. Added unit tests to cover the fallback config behavior, and created an integration test `repro_bundled_oauth` to verify that the CLI successfully initiates the OAuth flow using the fallback Client ID.
Seth Troisi committed
Jun 3, 2026 at 21:44 UTC
9f44fe2bfe6881d109d7515d9b41009d52877272
8 files changed
+159
-13
docs/04_automation_and_utility.md
+4
-3
@@ -1,6 +1,7 @@
1
---
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log:
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2026-06-01: Enabled `colab update --install` self-update on macOS in addition to Linux. Refactored platform check logic to keep the implementation DRY and updated both tests and documentation. Also, on these platforms, an additional message is shown recommending `colab update --install` to upgrade in place, positioned above the standard `pip`/`uv` installation command.
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+2026-05-29: Added default OAuth2 client config (`oauth_config.json`) as a bundled package resource and restored fallback loading logic in `get_credentials()`. The CLI now falls back to using these default credentials when no explicit local config is found. Added `integration/repro_bundled_oauth` integration test.
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2026-05-27: Refactored `colab README` and `colab AGENT` to bundle `README.md` and `AGENTS.md` via Hatchling's `force-include` and read them using `importlib.resources` instead of `importlib.metadata`. `colab AGENT` now correctly prints `AGENTS.md`.
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2026-05-27: Extended `colab update --install` to detect if the CLI was installed via `uv tool install` (by checking if `sys.executable` contains `/uv/`) and if so, use `uv tool install -U google-colab-cli` to upgrade.
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2026-05-27: Updated auto-update upgrade hint to recommend `pip install --upgrade google-colab-cli` instead of `colab`, aligning with the PyPI package name.
@@ -24,9 +25,9 @@ backend, selected via the global `--auth=<provider>` flag:
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1. **`oauth2`** (default): Standard public InstalledAppFlow via
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`google-auth-oauthlib`. Opens a browser for consent, caches the refresh
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- token at `~/.config/colab-cli/token.json`. Requires a client OAuth
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- config at `~/.colab-cli-oauth-config.json` or a path passed via
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- `-c/--client-oauth-config`.
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+ token at `~/.config/colab-cli/token.json`. If no local config is provided
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+ via `-c/--client-oauth-config` or found at `~/.colab-cli-oauth-config.json`,
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+ it falls back to a bundled `oauth_config.json` containing default OAuth credentials.
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2. **`adc`**: Application Default Credentials via `google.auth.default()`.
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Honors the standard ADC discovery chain
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(`GOOGLE_APPLICATION_CREDENTIALS`, `gcloud auth application-default
integration/README.md
+2
@@ -16,6 +16,8 @@ End-to-end tests that run against a **live Colab backend** (unlike the mocked un
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| `repro_keep_alive_scope/` | Slow soak test (~95s): runs the daemon long enough for one ping past the pre-flight, asserts no `keep_alive_error` events. |
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| `repro_variable_persistence/` | Variables persist across `colab exec` calls in the same session. |
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| `repro_piped_console/` | Fast smoke test (~5s including session creation): `echo cmd \| colab console -s s` runs the command and exits within 30s. Regression test for the 2026-05-07 EOF-handler fix. |
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+| `repro_bundled_oauth/` | Fast smoke test (~5s): verifies that the fallback OAuth configuration is loaded and starts the OAuth flow with the default client ID when local config is missing. |
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+
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## Running
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```bash
integration/repro_bundled_oauth/test.sh
new
+93
@@ -0,0 +1,93 @@
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+#!/bin/bash
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+# Copyright 2026 Google LLC
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+#
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+# Licensed under the Apache License, Version 2.0 (the "License");
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+# you may not use this file except in compliance with the License.
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+# You may obtain a copy of the License at
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+#
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+# http://www.apache.org/licenses/LICENSE-2.0
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+#
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+# Unless required by applicable law or agreed to in writing, software
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+# distributed under the License is distributed on an "AS IS" BASIS,
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+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+# See the License for the specific language governing permissions and
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+# limitations under the License.
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+#
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+# Integration Test: Fallback OAuth Configuration Verification
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+#
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+# This test verifies that the CLI correctly falls back to using the bundled
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+# oauth_config.json containing the default client ID when no local config is present.
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+# It simulates a fresh user flow by temporarily hiding existing tokens/configs,
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+# starting the OAuth flow, and asserting that the printed authorization URL
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+# contains the correct Client ID.
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+#
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+
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+set -e
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+
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+TOKEN_PATH="$HOME/.config/colab-cli/token.json"
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+CONFIG_PATH="$HOME/.colab-cli-oauth-config.json"
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+BACKUP_SUFFIX=".backup.$(date +%s)"
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+
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+TOKEN_BACKUP=""
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+CONFIG_BACKUP=""
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+
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+cleanup() {
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+ echo "[*] Cleaning up backups..."
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+ if [ -n "$TOKEN_BACKUP" ] && [ -f "$TOKEN_BACKUP" ]; then
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+ mv "$TOKEN_BACKUP" "$TOKEN_PATH"
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+ echo "[*] Restored token.json"
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+ fi
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+ if [ -n "$CONFIG_BACKUP" ] && [ -f "$CONFIG_BACKUP" ]; then
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+ mv "$CONFIG_BACKUP" "$CONFIG_PATH"
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+ echo "[*] Restored .colab-cli-oauth-config.json"
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+ fi
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+}
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+trap cleanup EXIT
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+
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+# 1. Back up existing configuration files if they exist
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+if [ -f "$TOKEN_PATH" ]; then
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+ TOKEN_BACKUP="${TOKEN_PATH}${BACKUP_SUFFIX}"
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+ mv "$TOKEN_PATH" "$TOKEN_BACKUP"
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+ echo "[*] Temporarily backed up token.json to $TOKEN_BACKUP"
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+fi
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+
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+if [ -f "$CONFIG_PATH" ]; then
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+ CONFIG_BACKUP="${CONFIG_PATH}${BACKUP_SUFFIX}"
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+ mv "$CONFIG_PATH" "$CONFIG_BACKUP"
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+ echo "[*] Temporarily backed up .colab-cli-oauth-config.json to $CONFIG_BACKUP"
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+fi
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+
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+# 2. Run colab sessions command to trigger the OAuth flow
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+echo "[*] Running 'colab --auth=oauth2 sessions' (expecting to trigger browser flow)..."
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+# We expect the command to block waiting for authorization, so we run it with a timeout.
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+# We redirect output to a file so we can inspect it.
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+OUTPUT_LOG=$(mktemp)
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+set +e
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+PYTHONUNBUFFERED=1 timeout 5 uv run colab --auth=oauth2 sessions > "$OUTPUT_LOG" 2>&1
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+EXIT_CODE=$?
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+set -e
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+
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+echo "[*] Command exited with code: $EXIT_CODE"
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+echo "----------------- CLI Output -----------------"
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+cat "$OUTPUT_LOG"
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+echo "----------------------------------------------"
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+
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+# 3. Assertions
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+EXPECTED_CLIENT_ID="764086051850-6qr4p6gpi6hn506pt8ejuq83di341hur.apps.googleusercontent.com"
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+
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+# The command should have printed the authorization URL
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+if ! grep -q "Please visit this URL to authorize this application" "$OUTPUT_LOG"; then
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+ echo "[FAILURE] OAuth prompt message not found in output."
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+ rm -f "$OUTPUT_LOG"
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+ exit 1
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+fi
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+
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+# The URL should contain the correct client ID
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+if ! grep -q "client_id=$EXPECTED_CLIENT_ID" "$OUTPUT_LOG"; then
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+ echo "[FAILURE] Authorization URL does not contain the expected client ID: $EXPECTED_CLIENT_ID"
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+ rm -f "$OUTPUT_LOG"
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+ exit 1
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+fi
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+
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+echo "[SUCCESS] Verified that CLI correctly initiated OAuth flow with the fallback Client ID: $EXPECTED_CLIENT_ID"
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+rm -f "$OUTPUT_LOG"
src/colab_cli/auth.py
+13
-1
@@ -15,6 +15,7 @@
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import enum
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import json
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import logging
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+from importlib import resources
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import os
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import warnings
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from typing import Optional
@@ -44,6 +45,7 @@ PUBLIC_SCOPES = [
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"openid",
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"https://www.googleapis.com/auth/userinfo.profile",
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"https://www.googleapis.com/auth/userinfo.email",
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+ "https://www.googleapis.com/auth/cloud-platform",
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"https://www.googleapis.com/auth/colaboratory",
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"https://www.googleapis.com/auth/drive.file",
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]
@@ -61,9 +63,18 @@ def _get_google_auth_credentials(config_path: str) -> Credentials:
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if os.path.exists(config_path):
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with open(config_path, "r") as f:
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client_config = json.load(f)
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+ else:
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+ # Last resort: try inlined config
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+ try:
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+ config_resource = resources.files("colab_cli").joinpath("oauth_config.json")
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+ if config_resource.is_file():
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+ client_config = json.loads(config_resource.read_text())
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+ except Exception as e:
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+ logger.debug(f"Failed to load inlined config: {e}")
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+
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if not client_config:
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raise FileNotFoundError(
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- f"Client OAuth config not found at {config_path}. "
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+ f"Client OAuth config not found at {config_path} and no inlined config available. "
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"Please provide a valid path via -c/--client-oauth-config."
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)
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@@ -139,6 +150,7 @@ def _get_adc_credentials() -> Credentials:
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)
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creds, _ = google.auth.default(scopes=list(PUBLIC_SCOPES))
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+
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if not creds.valid:
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from google.auth import compute_engine
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src/colab_cli/cli.py
+1
-1
@@ -75,7 +75,7 @@ def callback(
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),
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case_sensitive=False,
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),
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- ] = AuthProvider.ADC,
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+ ] = AuthProvider.OAUTH2,
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):
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"""
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Colab CLI global configuration.
src/colab_cli/oauth_config.json
new
+11
@@ -0,0 +1,11 @@
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+{
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+ "installed": {
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+ "client_id": "764086051850-6qr4p6gpi6hn506pt8ejuq83di341hur.apps.googleusercontent.com",
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+ "project_id": "colab-cli",
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+ "auth_uri": "https://accounts.google.com/o/oauth2/auth",
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+ "token_uri": "https://oauth2.googleapis.com/token",
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+ "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
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+ "client_secret": "d-FL95Q19q7MQmFpd7hHD0Ty",
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+ "redirect_uris": ["http://localhost"]
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+ }
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+}
tests/test_auth.py
+30
-2
@@ -27,9 +27,11 @@ def mock_deps(mocker):
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m_flow_cls = mocker.patch("colab_cli.auth.InstalledAppFlow")
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m_request = mocker.patch("colab_cli.auth.Request")
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m_session = mocker.patch("colab_cli.auth.requests.AuthorizedSession")
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+ m_resources = mocker.patch("colab_cli.auth.resources")
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- # By default, pretend oauth config doesn't exist
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+ # By default, pretend oauth config doesn't exist anywhere
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m_exists.return_value = False
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+ m_resources.files.return_value.joinpath.return_value.is_file.return_value = False
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return {
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"exists": m_exists,
@@ -38,11 +40,15 @@ def mock_deps(mocker):
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"flow_cls": m_flow_cls,
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"request": m_request,
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"session": m_session,
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+ "resources": m_resources,
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}
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46
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def test_get_credentials_no_config(mock_deps):
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- with pytest.raises(FileNotFoundError, match="Client OAuth config not found"):
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+ with pytest.raises(
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+ FileNotFoundError,
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+ match="Client OAuth config not found.*and no inlined config available",
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+ ):
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get_credentials("missing_config.json", provider=AuthProvider.OAUTH2)
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@@ -105,3 +111,25 @@ def test_get_credentials_no_token(mock_deps):
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mock_deps["flow_cls"].from_client_config.assert_called_once()
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mock_flow.run_local_server.assert_called_once()
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+
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+
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+def test_get_credentials_fallback_config(mock_deps):
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+ # Setup: config_path doesn't exist, but fallback file does
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+ mock_deps["exists"].return_value = False
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+ m_file = mock_deps["resources"].files.return_value.joinpath.return_value
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+ m_file.is_file.return_value = True
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+ m_file.read_text.return_value = '{"installed":{"client_id":"fallback_id"}}'
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+
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+ # Valid creds in token
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+ mock_deps["exists"].side_effect = lambda path: path == TOKEN_CONFIG_PATH
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+ mock_creds = MagicMock()
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+ mock_creds.valid = True
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+ mock_deps["creds_cls"].from_authorized_user_file.return_value = mock_creds
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+
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+ res = get_credentials("missing_config.json", provider=AuthProvider.OAUTH2)
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+
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+ mock_deps["resources"].files.assert_called_once_with("colab_cli")
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+ m_file.is_file.assert_called_once()
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+ m_file.read_text.assert_called_once()
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+ mock_deps["creds_cls"].from_authorized_user_file.assert_called_once()
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+ assert res == mock_deps["session"].return_value
tests/test_auth_adc.py
+5
-6
@@ -70,10 +70,8 @@ def test_get_credentials_adc_does_not_invoke_other_providers(mocker):
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mock_flow.from_client_config.assert_not_called()
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72
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-def test_get_credentials_adc_requests_colaboratory_scope(mocker):
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- """The RuntimeService at colab.pa.googleapis.com requires the
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- `colaboratory` scope. ADC must request it via google.auth.default().
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- """
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+def test_get_credentials_adc_requests_required_scopes(mocker):
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+ """ADC must request required scopes via google.auth.default()."""
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mock_creds = MagicMock()
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# Pretend creds don't need re-scoping (e.g., user creds from gcloud).
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mock_creds.requires_scopes = False
@@ -87,12 +85,13 @@ def test_get_credentials_adc_requests_colaboratory_scope(mocker):
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scopes = mock_default.call_args.kwargs.get("scopes")
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assert scopes is not None, "google.auth.default() must be called with scopes="
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assert "https://www.googleapis.com/auth/colaboratory" in scopes
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+ assert "https://www.googleapis.com/auth/cloud-platform" in scopes
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assert "https://www.googleapis.com/auth/userinfo.email" in scopes
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def test_get_credentials_adc_reapplies_scopes_for_scopable_creds(mocker):
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"""For credential subclasses that support `with_scopes` (service accounts,
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- GCE/GKE, etc.), we must call it so the colaboratory scope sticks even if
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+ GCE/GKE, etc.), we must call it so the scopes stick even if
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google.auth.default() ignored the kwarg.
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"""
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rescoped = MagicMock(name="rescoped_creds")
@@ -106,7 +105,7 @@ def test_get_credentials_adc_reapplies_scopes_for_scopable_creds(mocker):
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mock_creds.with_scopes.assert_called_once()
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applied_scopes = mock_creds.with_scopes.call_args.args[0]
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- assert "https://www.googleapis.com/auth/colaboratory" in applied_scopes
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+ assert "https://www.googleapis.com/auth/cloud-platform" in applied_scopes
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# The session is built from the *rescoped* creds, not the original.
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mock_session_cls.assert_called_once_with(rescoped)
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