gitlab-org--gitlab-foss/doc/development/licensed_feature_availability.md

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Licensed feature availability

As of GitLab 9.4, we've been supporting a simplified version of licensed feature availability checks via ee/app/models/license.rb, both for on-premise or GitLab.com plans and features.

Restricting features scoped by namespaces or projects

GitLab.com plans are persisted on user groups and namespaces, therefore, if you're adding a feature such as Related issues or Service Desk, it should be restricted on namespace scope.

1. Add the feature symbol on STARTER_FEATURES, PREMIUM_FEATURES, or ULTIMATE_FEATURES constants in ee/app/models/gitlab_subscriptions/features.rb.
2. Check using:

project.feature_available?(:feature_symbol)

Restricting global features (instance)

However, for features such as Geo and Database Load Balancing, which cannot be restricted to only a subset of projects or namespaces, the check is made directly in the instance license.

1. Add the feature symbol to STARTER_FEATURES, PREMIUM_FEATURES or ULTIMATE_FEATURES constants in ee/app/models/gitlab_subscriptions/features.rb.
2. Add the same feature symbol to GLOBAL_FEATURES.
3. Check using:

License.feature_available?(:feature_symbol)

Restricting frontend features

To restrict frontend features based on the license, use push_licensed_feature. The frontend can then access this via this.glFeatures:

before_action do
  push_licensed_feature(:feature_symbol)
  # or by project/namespace
  push_licensed_feature(:feature_symbol, project)
end