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Local development

This guide covers how to develop the system locally. Note that the configuration options described in this page are optimized for local development and may not represent best practices.

  1. Install gcloud.

  2. Create a Google Cloud project using the Cloud Console. Set your Project ID as an environment variable:

    export PROJECT_ID="..."

    Note this is the project ID, not name or number.

  3. Configure gcloud:

    gcloud auth login --update-adc && \
gcloud auth application-default set-quota-project "${PROJECT_ID}"

  4. Install the Firebase CLI.

  5. Configure the Firebase CLI:

    firebase login

    Use the same Google credentials as you used in the previous steps.

  6. Change directory into this repository:

    cd /path/to/exposure-notifications-verification-server

  7. Bootstrap the local key management system:

    go run ./tools/gen-keys

    This will output some environment variables. Save these environment variables for the next step!

    The default development setup uses a local, on-disk key manager to persist across server restarts. The production installation recommends a hosted key management service like Google Cloud KMS. It is possible to use Google Cloud KMS locally by following the instructions in the production setup guide.

  8. Create a .env file with your configuration. This will aid future development since you can source this file instead of trying to find all these values again.

    # Google project configuration.
export PROJECT_ID="TODO"
export GOOGLE_CLOUD_PROJECT="${PROJECT_ID}"

# Get these values from the firebase console.
export FIREBASE_API_KEY="TODO"
export FIREBASE_PROJECT_ID="${PROJECT_ID}"
export FIREBASE_MESSAGE_SENDER_ID="TODO"
export FIREBASE_APP_ID="TODO"
export FIREBASE_MEASUREMENT_ID="TODO"
export FIREBASE_AUTH_DOMAIN="${PROJECT_ID}.firebaseapp.com"
export FIREBASE_DATABASE_URL="https://${PROJECT_ID}.firebaseio.com"
export FIREBASE_STORAGE_BUCKET="${PROJECT_ID}.appspot.com"

# Disable local observability.
export OBSERVABILITY_EXPORTER="NOOP"

# Configure cache and cache HMAC. Create your own values with:
#
#     openssl rand -base64 128
#
export CACHE_TYPE="IN_MEMORY"
export CACHE_HMAC_KEY="/wC2dki5Z+To9iFwUamINtHIMOH/dME7e5Gy+9h3WTDBhqeeSYkqduZRjcZWwG3kPMdiWAdBxxop5wB+BHTBnSlfVVmy8qKVNv+Wf5ywgxV7SbB8bjNQBHSpn7aC5RxR6nkEsZ2w2fUhTJwD9q+MDo6TQvf+8OXEPrV1SXWNHrs="

# Configure rate limiter. Create your own values with:
#
#     openssl rand -base64 128
#
export RATE_LIMIT_TYPE="MEMORY"
export RATE_LIMIT_HMAC_KEY="/wC2dki5Z+To9iFwUamINtHIMOH/dME7e5Gy+9h3WTDBhqeeSYkqduZRjcZWwG3kPMdiWAdBxxop5wB+BHTBnSlfVVmy8qKVNv+Wf5ywgxV7SbB8bjNQBHSpn7aC5RxR6nkEsZ2w2fUhTJwD9q+MDo6TQvf+8OXEPrV1SXWNHrs="

# Configure certificate key management. The CERTIFICATE_SIGNING_KEY should
# be the value output in the previous step.
export CERTIFICATE_KEY_MANAGER="FILESYSTEM"
export CERTIFICATE_KEY_FILESYSTEM_ROOT="$(pwd)/local"
export CERTIFICATE_SIGNING_KEY="TODO" # (e.g. "/system/certificate-signing/1122334455")

# Configure sms key management.
export SMS_KEY_MANAGER="FILESYSTEM"
export SMS_KEY_FILESYSTEM_ROOT="$(pwd)/local"

# Configure token key management. The TOKEN_SIGNING_KEY should be the value
# output in the previous step.
export TOKEN_KEY_MANAGER="FILESYSTEM"
export TOKEN_KEY_FILESYSTEM_ROOT="$(pwd)/local"
export TOKEN_SIGNING_KEY="TODO" # (e.g. "/system/token-signing")

# Configure the database key manager. The DB_KEYRING and DB_ENCRYPTION_KEY
# should be the values output in the previous step.
export DB_KEY_MANAGER="FILESYSTEM"
export DB_KEY_FILESYSTEM_ROOT="$(pwd)/local"
export DB_KEYRING="TODO" # (e.g. "/realm")
export DB_ENCRYPTION_KEY="TODO" # (e.g. "/system/database-encryption")

# Use an in-memory key manager for encrypting values in the database. Create
# your own encryption key with `openssl rand -base64 64`.
export KEY_MANAGER="IN_MEMORY"
export DB_ENCRYPTION_KEY="O04ZjG4WuoceRd0k2pTqDN0r8omr6sbFL0U3T5b12Lo="

# Secrets.
export SECRET_MANAGER="FILESYSTEM"
export SECRET_FILESYSTEM_ROOT="$(pwd)/local/secrets"

# Configure database pooling.
export DB_POOL_MIN_CONNS="2"
export DB_POOL_MAX_CONNS="10"

# Enable dev mode. Do not enable dev mode or database dev mode in production
# environments.
export LOG_MODE="development"
export LOG_LEVEL="debug"
export DEV_MODE="true"
export DB_DEBUG="true"

  9. Source the .env file. Do this each time before you start the server:

    source .env

  10. Start the database:

    eval $(./scripts/dev init)
./scripts/dev dbstart

  11. Run any migrations:

    ./scripts/dev dbmigrate

  12. (Optional) Seed the database with fake data:

    ./scripts/dev dbseed

    This will create some default users like [email protected] and [email protected] for local development. Check the seed file for more details on what is created.

  13. Start the server:

    go run ./cmd/server

    Open your browser to http://localhost:8080.

Tips

Bypass MFA

Register a test-phone-number for your account by visiting:

https://console.cloud.google.com/customer-identity/mfa?project=${PROJECT_ID}

This will skip the actual sending of SMS codes for 2-factor auth and allow you to instead set a static challenge response code. Do not do this in production.

Feature Flags

For functionality that is ready for test environments but not yet ready for default on in production, that functionality should be guarded by a feature flag.

Define the new flag in pkg/config/feature_config.go.

The feature config is available in the config struct of all servers.

For the UI server (server), flags values are automatically added to the template variables for use in the HTML templates.

If a whole controller should be controlled by this flag, you should install the enabled middleware with the correct boolean value at route configuration time.