Class: BellaBaxter::E2EEFaradayMiddleware

Inherits:
Faraday::Middleware
  • Object
show all
Defined in:
lib/bella_baxter/e2ee_faraday_middleware.rb

Overview

Faraday middleware that transparently adds E2EE to GET /secrets requests.

On outbound: adds X-E2E-Public-Key header so the server encrypts the response. On inbound: decrypts the encrypted payload and reconstructs a normal secrets response.

Instance Method Summary collapse

Constructor Details

#initialize(app, key_pair: nil, on_wrapped_dek_received: nil) ⇒ E2EEFaradayMiddleware

Returns a new instance of E2EEFaradayMiddleware.



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# File 'lib/bella_baxter/e2ee_faraday_middleware.rb', line 12

def initialize(app, key_pair: nil, on_wrapped_dek_received: nil)
  super(app)
  @e2ee = key_pair || E2EE::KeyPair.new
  @on_wrapped_dek_received = on_wrapped_dek_received
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/bella_baxter/e2ee_faraday_middleware.rb', line 18

def call(env)
  is_secrets_get = env.method == :get && env.url.path.end_with?("/secrets")

  if is_secrets_get
    env.request_headers["X-E2E-Public-Key"] = @e2ee.public_key_b64
  end

  @app.call(env).on_complete do |resp_env|
    next unless is_secrets_get && resp_env.status == 200

    data = JSON.parse(resp_env.body)
    next unless data["encrypted"]

    decrypted = @e2ee.decrypt_raw(data)
    if decrypted.is_a?(Hash) && decrypted.key?("secrets") && decrypted["secrets"].is_a?(Hash)
      resp_env[:body] = JSON.generate(decrypted)
    else
      secrets = @e2ee.decrypt(data)
      resp_env[:body] = JSON.generate(
        "secrets"         => secrets,
        "version"         => 0,
        "environmentSlug" => "",
        "environmentName" => "",
        "lastModified"    => ""
      )
    end

    if @on_wrapped_dek_received
      wrapped_dek = resp_env.response_headers["X-Bella-Wrapped-Dek"] ||
                    resp_env.response_headers["x-bella-wrapped-dek"]
      if wrapped_dek
        lease_expires = resp_env.response_headers["X-Bella-Lease-Expires"] ||
                        resp_env.response_headers["x-bella-lease-expires"]
        path        = env.url.path
        project_slug = path[%r{/projects/([^/]+)}, 1] || ""
        env_slug     = path[%r{/environments/([^/]+)}, 1] || ""
        @on_wrapped_dek_received.call(project_slug, env_slug, wrapped_dek, lease_expires)
      end
    end
  end
end