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envoy-extensions

This repo demostrates two patterns to extend Envoy to add custom logic before sending the request to the actual upstream application.

Patterns

Pattern 1 - External Authorization (ext_authz filter)

This pattern leverages the ext_authz filter in Envoy to callout to an external service.

Routing Pattern1

The external service can:

  1. Implement custom rules for authorization

  2. Implement routing changes

  3. Access the payload (but not modify it) - upto a limit specified in the Envoy configuration

See more here

Pattern 2 - Envoy chaining (aka Envoy "sandwich")

This pattern leverages two logical Envoy proxies sandwiched between custom code/logic.

Routing Pattern2

The middle proxy can:

  1. Implment routing changes.

  2. Full access to the payload to transform/modify.

See more here

Support

This is not an officially supported Google product