README

Fusio adapter for calling Cloud Run services with automatic Google-signed ID token injection.

Provides a Connection type and a matching Action type that work together:

Connection (Google Cloud Run Zero Trust HTTP) — returns a Guzzle HTTP client with ID token middleware
Action (Google Cloud Run HTTP) — proxies Fusio requests through that connection to a downstream Cloud Run service

Install

composer require fusio/adapter-gcp-zero-trust
php bin/fusio system:register "Fusio\Adapter\GcpZeroTrust\Adapter"

Setup

Step 1: Create a Connection

Backend > API > Connections > Create

Select type: Google Cloud Run Zero Trust HTTP

Field	Description
Base URL	Target service URL, e.g. `https://my-service-abc123.run.app`
Audience	Cloud Run audience for the ID token. Usually the same as the base URL. Must be the `.run.app` URL (custom domains are not supported as audience).
Header Mode	`Authorization` or `X-Serverless-Authorization` (see below)
Timeout	HTTP timeout in seconds (default: 30)
Enable Logging	Log outbound requests with method, path, status code, and duration. Never logs tokens or bodies.

Step 2: Create an Action

Backend > API > Actions > Create

Select type: Google Cloud Run HTTP

Field	Description
Connection	Select the connection created in Step 1 (dropdown of all configured connections)
Method	`AUTO` (forwards the inbound HTTP method), or a fixed method: `GET`, `POST`, `PUT`, `PATCH`, `DELETE`
Path	Relative path on the target service, e.g. `/api/v1/users`. Supports `{{param}}` placeholders resolved from URI fragments.
Forward Headers	Comma-separated list of inbound headers to forward, e.g. `X-Request-Id, Accept-Language`

Step 3: Bind the Action to an Operation

Backend > API > Operations

Point a route to the action. The action will:

Load the configured connection (which returns a Guzzle client with ID token middleware)
Forward the HTTP method, path, query parameters, and request body to the downstream service
Return the downstream response (status code, headers, and body) back through Fusio

Header modes

Authorization — Sets Authorization: Bearer <id-token>. Use when the target service has no app-level auth.
X-Serverless-Authorization — Sets X-Serverless-Authorization: Bearer <id-token>, leaving Authorization free for app-level auth (e.g. Fusio Bearer tokens). Cloud Run validates this header for IAM, strips it before forwarding to the container, and passes Authorization through untouched. Cloud Run docs.

How authentication works

The adapter uses Google Application Default Credentials to fetch ID tokens:

On Cloud Run: Uses the metadata server automatically. The calling service's service account must have roles/run.invoker on the target service.
Locally: Uses credentials from gcloud auth application-default login.

Tokens are cached in-process for ~55 minutes (tokens are valid for 1 hour) using google/auth's FetchAuthTokenCache with MemoryCacheItemPool.

Example: Dockerfile for a custom Fusio image

FROM fusio/fusio:5.2.5

WORKDIR /var/www/html/fusio

RUN composer require fusio/adapter-gcp-zero-trust:^0.2 \
    --no-interaction --no-progress

RUN php bin/fusio system:register \
    "Fusio\\Adapter\\GcpZeroTrust\\Adapter"

Requirements

PHP >= 8.1
Fusio Engine ^6.0 (ships with fusio/fusio v5.2+)
google/auth ^1.50
guzzlehttp/guzzle ^7.0

Development

make install    # Install dependencies
make test       # Run tests (PHPUnit)
make lint       # Static analysis (phpstan level 6)

License

Apache-2.0

iamxml/fusio-adapter-gcp-zero-trust

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