Add support for default secret service

Signed-off-by: Jason Barnett <jason.w.barnett@gmail.com>

4 files changed, 272 insertions, 24 deletions

diff --git a/lib/chef/dsl/secret.rb b/lib/chef/dsl/secret.rb
index 9d616ff35f..2377ae36fe 100644
--- a/lib/chef/dsl/secret.rb
+++ b/lib/chef/dsl/secret.rb
@@ -21,6 +21,118 @@ class Chef
   module DSL
     module Secret
 
+      #
+      # This allows you to set the default secret service that is used when
+      # fetching secrets.
+      #
+      # @example
+      #
+      #   default_secret_service :hashi_vault
+      #   val1 = secret(name: "test1", config: { region: "us-west-1" })
+      #
+      # @example
+      #
+      #   default_secret_service #=> nil
+      #   default_secret_service :hashi_vault
+      #   default_secret_service #=> :hashi_vault
+      #
+      # @param [Symbol] service default secret service to use when fetching secrets
+      # @return [Symbol, nil] default secret service to use when fetching secrets
+      #
+      def default_secret_service(service = nil)
+        return run_context.default_secret_service if service.nil?
+        raise Chef::Exceptions::Secret::InvalidFetcherService.new("Unsupported secret service: #{service.inspect}", Chef::SecretFetcher::SECRET_FETCHERS) unless Chef::SecretFetcher::SECRET_FETCHERS.include?(service)
+
+        run_context.default_secret_service = service
+      end
+
+      #
+      # This allows you to set the secret service for the scope of the block
+      # passed into this method.
+      #
+      # @example
+      #
+      #   with_secret_service :hashi_vault do
+      #     val1 = secret(name: "test1", config: { region: "us-west-1" })
+      #     val2 = secret(name: "test2", config: { region: "us-west-1" })
+      #   end
+      #
+      # @example Combine with #with_secret_config
+      #
+      #   with_secret_service :hashi_vault do
+      #     with_secret_config region: "us-west-1" do
+      #       val1 = secret(name: "test1")
+      #       val2 = secret(name: "test2")
+      #     end
+      #   end
+      #
+      # @param [Symbol] service The default secret service to use when fetching secrets
+      #
+      def with_secret_service(service)
+        raise ArgumentError, "You must pass a block to #with_secret_service" unless block_given?
+
+        begin
+          old_service = default_secret_service
+          # Use "public" API for input validation
+          default_secret_service(service)
+          yield
+        ensure
+          # Use "private" API so we can set back to nil
+          run_context.default_secret_service = old_service
+        end
+      end
+
+      #
+      # This allows you to set the default secret config that is used when
+      # fetching secrets.
+      #
+      # @example
+      #
+      #   default_secret_config region: "us-west-1"
+      #   val1 = secret(name: "test1", service: :hashi_vault)
+      #
+      # @example
+      #
+      #   default_secret_config #=> {}
+      #   default_secret_service region: "us-west-1"
+      #   default_secret_service #=> { region: "us-west-1" }
+      #
+      # @param [Hash<Symbol,Object>] config The default configuration options to apply when fetching secrets
+      # @return [Hash<Symbol,Object>]
+      #
+      def default_secret_config(**config)
+        return run_context.default_secret_config if config.empty?
+
+        run_context.default_secret_config = config
+      end
+
+      #
+      # This allows you to set the secret config for the scope of the block
+      # passed into this method.
+      #
+      # @example
+      #
+      #   with_secret_config region: "us-west-1" do
+      #     val1 = secret(name: "test1", service: :hashi_vault)
+      #     val2 = secret(name: "test2", service: :hashi_vault)
+      #   end
+      #
+      # @param [Hash<Symbol,Object>] config The default configuration options to use when fetching secrets
+      #
+      def with_secret_config(**config)
+        raise ArgumentError, "You must pass a block to #with_secret_config" unless block_given?
+
+        begin
+          old_config = default_secret_config
+          # Use "public" API for input validation
+          default_secret_config(**config)
+          yield
+        ensure
+          # Use "private" API so we can set back to nil
+          run_context.default_secret_config = old_config
+        end
+      end
+
       # Helper method which looks up a secret using the given service and configuration,
       # and returns the retrieved secret value.
       # This DSL providers a wrapper around [Chef::SecretFetcher]
@@ -49,7 +161,7 @@ class Chef
       #
       #   value = secret(name: "test1", service: :aws_secrets_manager, version: "v1", config: { region: "us-west-1" })
       #   log "My secret is #{value}"
-      def secret(name: nil, version: nil, service: nil, config: {})
+      def secret(name: nil, version: nil, service: default_secret_service, config: default_secret_config)
         Chef::Log.warn <<~EOM.gsub("\n", " ")
           The secrets Chef Infra language helper is currently in beta. If you have feedback or you would
           like to be part of the future design of this helper e-mail us at secrets_management_beta@progress.com"
diff --git a/lib/chef/run_context.rb b/lib/chef/run_context.rb
index 94f8a316e0..ce4d545aa4 100644
--- a/lib/chef/run_context.rb
+++ b/lib/chef/run_context.rb
@@ -145,6 +145,16 @@ class Chef
     #
     attr_accessor :input_collection
 
+    #
+    # @return [Symbol, nil]
+    #
+    attr_accessor :default_secret_service
+
+    #
+    # @return [Hash<Symbol,Object>]
+    #
+    attr_accessor :default_secret_config
+
     # Pointer back to the Chef::Runner that created this
     #
     attr_accessor :runner
@@ -222,6 +232,8 @@ class Chef
       @input_collection = Chef::Compliance::InputCollection.new(events)
       @waiver_collection = Chef::Compliance::WaiverCollection.new(events)
       @profile_collection = Chef::Compliance::ProfileCollection.new(events)
+      @default_secret_service = nil
+      @default_secret_config = {}
 
       initialize_child_state
     end
@@ -693,6 +705,10 @@ class Chef
         cookbook_collection
         cookbook_collection=
         cookbook_compiler
+        default_secret_config
+        default_secret_config=
+        default_secret_service
+        default_secret_service=
         definitions
         events
         events=
diff --git a/spec/unit/dsl/secret_spec.rb b/spec/unit/dsl/secret_spec.rb
index 96a915c43d..9952980697 100644
--- a/spec/unit/dsl/secret_spec.rb
+++ b/spec/unit/dsl/secret_spec.rb
@@ -17,11 +17,14 @@
 #
 
 require "spec_helper"
+require "chef/exceptions"
 require "chef/dsl/secret"
 require "chef/secret_fetcher/base"
+
 class SecretDSLTester
   include Chef::DSL::Secret
-  # Because DSL is invoked in the context of a recipe,
+
+  # Because DSL is invoked in the context of a recipe or attribute file
   # we expect run_context to always be available when SecretFetcher::Base
   # requests it - making it safe to mock here
   def run_context
@@ -37,35 +40,136 @@ end
 
 describe Chef::DSL::Secret do
   let(:dsl) { SecretDSLTester.new }
-  it "responds to 'secret'" do
-    expect(dsl.respond_to?(:secret)).to eq true
+  let(:run_context) { Chef::RunContext.new(Chef::Node.new, {}, Chef::EventDispatch::Dispatcher.new) }
+
+  before do
+    allow(dsl).to receive(:run_context).and_return(run_context)
   end
 
-  it "uses SecretFetcher.for_service to find the fetcher" do
-    substitute_fetcher = SecretFetcherImpl.new({}, nil)
-    expect(Chef::SecretFetcher).to receive(:for_service).with(:example, {}, nil).and_return(substitute_fetcher)
-    expect(substitute_fetcher).to receive(:fetch).with("key1", nil)
-    dsl.secret(name: "key1", service: :example, config: {})
+  %w{
+      secret
+      default_secret_service
+      default_secret_config
+      with_secret_service
+      with_secret_config
+    }.each do |m|
+      it "responds to ##{m}" do
+        expect(dsl.respond_to?(m)).to eq true
+      end
+    end
+
+  describe "#default_secret_service" do
+    let(:service) { :hashi_vault }
+
+    it "persists the service passed in as an argument" do
+      expect(dsl.default_secret_service).to eq(nil)
+      dsl.default_secret_service(service)
+      expect(dsl.default_secret_service).to eq(service)
+    end
+
+    it "returns run_context.default_secret_service value when no argument is given" do
+      run_context.default_secret_service = :my_thing
+      expect(dsl.default_secret_service).to eq(:my_thing)
+    end
+
+    it "raises exception when service given is not valid" do
+      stub_const("Chef::SecretFetcher::SECRET_FETCHERS", %i{service_a service_b})
+      expect { dsl.default_secret_service(:unknown_service) }.to raise_error(Chef::Exceptions::Secret::InvalidFetcherService)
+    end
   end
 
-  it "resolves a secret when using the example fetcher" do
-    secret_value = dsl.secret(name: "test1", service: :example, config: { "test1" => "secret value" })
-    expect(secret_value).to eq "secret value"
+  describe "#with_secret_config" do
+    let(:service) { :hashi_vault }
+
+    it "sets the service for the scope of the block only" do
+      expect(dsl.default_secret_service).to eq(nil)
+      dsl.with_secret_service(service) do
+        expect(dsl.default_secret_service).to eq(service)
+      end
+      expect(dsl.default_secret_service).to eq(nil)
+    end
+
+    it "raises exception when block is not given" do
+      expect { dsl.with_secret_service(service) }.to raise_error(ArgumentError)
+    end
   end
 
-  context "when used within a resource" do
-    let(:run_context) {
-      Chef::RunContext.new(Chef::Node.new,
-                           Chef::CookbookCollection.new(Chef::CookbookLoader.new(File.join(CHEF_SPEC_DATA, "cookbooks"))),
-                           Chef::EventDispatch::Dispatcher.new)
-    }
-
-    it "marks that resource as 'sensitive'" do
-      recipe = Chef::Recipe.new("secrets", "test", run_context)
-      recipe.zen_master "secret_test" do
-        peace secret(name: "test1", service: :example, config: { "test1" => true })
+  describe "#default_secret_config" do
+    let(:config) { { my_key: "value" } }
+
+    it "persists the config passed in as argument" do
+      expect(dsl.default_secret_config).to eq({})
+      dsl.default_secret_config(**config)
+      expect(dsl.default_secret_config).to eq(config)
+    end
+
+    it "returns run_context.default_secret_config value when no argument is given" do
+      run_context.default_secret_config = { my_thing: "that" }
+      expect(dsl.default_secret_config).to eq({ my_thing: "that" })
+    end
+  end
+
+  describe "#with_secret_config" do
+    let(:config) { { my_key: "value" } }
+
+    it "sets the config for the scope of the block only" do
+      expect(dsl.default_secret_config).to eq({})
+      dsl.with_secret_config(**config) do
+        expect(dsl.default_secret_config).to eq(config)
       end
-      expect(run_context.resource_collection.lookup("zen_master[secret_test]").sensitive).to eql(true)
+      expect(dsl.default_secret_config).to eq({})
+    end
+
+    it "raises exception when block is not given" do
+      expect { dsl.with_secret_config(**config) }.to raise_error(ArgumentError)
+    end
+  end
+
+  describe "#secret" do
+    it "uses SecretFetcher.for_service to find the fetcher" do
+      substitute_fetcher = SecretFetcherImpl.new({}, nil)
+      expect(Chef::SecretFetcher).to receive(:for_service).with(:example, {}, run_context).and_return(substitute_fetcher)
+      expect(substitute_fetcher).to receive(:fetch).with("key1", nil)
+      dsl.secret(name: "key1", service: :example, config: {})
+    end
+
+    it "resolves a secret when using the example fetcher" do
+      secret_value = dsl.secret(name: "test1", service: :example, config: { "test1" => "secret value" })
+      expect(secret_value).to eq "secret value"
+    end
+
+    context "when used within a resource" do
+      let(:run_context) {
+        Chef::RunContext.new(Chef::Node.new,
+                             Chef::CookbookCollection.new(Chef::CookbookLoader.new(File.join(CHEF_SPEC_DATA, "cookbooks"))),
+                             Chef::EventDispatch::Dispatcher.new)
+      }
+
+      it "marks that resource as 'sensitive'" do
+        recipe = Chef::Recipe.new("secrets", "test", run_context)
+        recipe.zen_master "secret_test" do
+          peace secret(name: "test1", service: :example, config: { "test1" => true })
+        end
+        expect(run_context.resource_collection.lookup("zen_master[secret_test]").sensitive).to eql(true)
+      end
+    end
+
+    it "passes default service to SecretFetcher.for_service" do
+      service = :example
+      dsl.default_secret_service(service)
+      substitute_fetcher = SecretFetcherImpl.new({}, nil)
+      expect(Chef::SecretFetcher).to receive(:for_service).with(service, {}, run_context).and_return(substitute_fetcher)
+      allow(substitute_fetcher).to receive(:fetch).with("key1", nil)
+      dsl.secret(name: "key1")
+    end
+
+    it "passes default config to SecretFetcher.for_service" do
+      config = { my_config: "value" }
+      dsl.default_secret_config(**config)
+      substitute_fetcher = SecretFetcherImpl.new({}, nil)
+      expect(Chef::SecretFetcher).to receive(:for_service).with(:example, config, run_context).and_return(substitute_fetcher)
+      allow(substitute_fetcher).to receive(:fetch).with("key1", nil)
+      dsl.secret(name: "key1", service: :example)
     end
   end
 end
diff --git a/spec/unit/run_context_spec.rb b/spec/unit/run_context_spec.rb
index 5bd7a360fb..3ec8eeed61 100644
--- a/spec/unit/run_context_spec.rb
+++ b/spec/unit/run_context_spec.rb
@@ -53,6 +53,22 @@ describe Chef::RunContext do
     expect(run_context.node).to eq(node)
   end
 
+  it "responds to #default_secret_service" do
+    expect(run_context).to respond_to(:default_secret_service)
+  end
+
+  it "responds to #default_secret_config" do
+    expect(run_context).to respond_to(:default_secret_config)
+  end
+
+  it "#default_secret_service defaults to nil" do
+    expect(run_context.default_secret_service).to eq(nil)
+  end
+
+  it "#default_secret_config defaults to {}" do
+    expect(run_context.default_secret_config).to eq({})
+  end
+
   it "loads up node[:cookbooks]" do
     expect(run_context.node[:cookbooks]).to eql(
       {