feat: add secrets adapter for aws secrets manager

lib/kamal/secrets/adapters/aws_secrets_manager.rb

@@ -0,0 +1,34 @@
+class Kamal::Secrets::Adapters::AwsSecretsManager < Kamal::Secrets::Adapters::Base
+  private
+    def login(_account)
+      nil
+    end
+
+    def fetch_secrets(secrets, account:, session:)
+      {}.tap do |results|
+        JSON.parse(get_from_secrets_manager(secrets, account: account))["SecretValues"].each do |secret|
+          secret_name = secret["Name"]
+          secret_string = JSON.parse(secret["SecretString"])
+
+          secret_string.each do |key, value|
+            results["#{secret_name}/#{key}"] = value
+          end
+        end
+      end
+    end
+
+    def get_from_secrets_manager(secrets, account:)
+      `aws secretsmanager batch-get-secret-value --secret-id-list #{secrets.map(&:shellescape).join(" ")} --profile #{account.shellescape}`.tap do
+        raise RuntimeError, "Could not read #{secret} from AWS Secrets Manager" unless $?.success?
+      end
+    end
+
+    def check_dependencies!
+      raise RuntimeError, "AWS CLI is not installed" unless cli_installed?
+    end
+
+    def cli_installed?
+      `aws --version 2> /dev/null`
+      $?.success?
+    end
+end

test/secrets/aws_secrets_manager_adapter_test.rb

@@ -0,0 +1,98 @@
+require "test_helper"
+
+class AwsSecretsManagerAdapterTest < SecretAdapterTestCase
+  test "fetch" do
+    stub_ticks.with("aws --version 2> /dev/null")
+    stub_ticks
+      .with("aws secretsmanager batch-get-secret-value --secret-id-list secret/KEY1 secret/KEY2 secret2/KEY3 --profile default")
+      .returns(<<~JSON)
+        {
+          "SecretValues": [
+            {
+              "ARN": "arn:aws:secretsmanager:us-east-1:aaaaaaaaaaaa:secret:secret",
+              "Name": "secret",
+              "VersionId": "vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv",
+              "SecretString": "{\\"KEY1\\":\\"VALUE1\\", \\"KEY2\\":\\"VALUE2\\"}",
+              "VersionStages": [
+                  "AWSCURRENT"
+              ],
+              "CreatedDate": "2024-01-01T00:00:00.000000"
+            },
+            {
+              "ARN": "arn:aws:secretsmanager:us-east-1:aaaaaaaaaaaa:secret:secret2",
+              "Name": "secret2",
+              "VersionId": "vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv",
+              "SecretString": "{\\"KEY3\\":\\"VALUE3\\"}",
+              "VersionStages": [
+                  "AWSCURRENT"
+              ],
+              "CreatedDate": "2024-01-01T00:00:00.000000"
+            }
+          ],
+          "Errors": []
+        }
+      JSON
+
+    json = JSON.parse(shellunescape(run_command("fetch", "secret/KEY1", "secret/KEY2", "secret2/KEY3")))
+
+    expected_json = {
+      "secret/KEY1"=>"VALUE1",
+      "secret/KEY2"=>"VALUE2",
+      "secret2/KEY3"=>"VALUE3"
+    }
+
+    assert_equal expected_json, json
+  end
+
+  test "fetch with secret names" do
+    stub_ticks.with("aws --version 2> /dev/null")
+    stub_ticks
+      .with("aws secretsmanager batch-get-secret-value --secret-id-list secret/KEY1 secret/KEY2 --profile default")
+      .returns(<<~JSON)
+        {
+          "SecretValues": [
+            {
+              "ARN": "arn:aws:secretsmanager:us-east-1:aaaaaaaaaaaa:secret:secret",
+              "Name": "secret",
+              "VersionId": "vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv",
+              "SecretString": "{\\"KEY1\\":\\"VALUE1\\", \\"KEY2\\":\\"VALUE2\\"}",
+              "VersionStages": [
+                  "AWSCURRENT"
+              ],
+              "CreatedDate": "2024-01-01T00:00:00.000000"
+            }
+          ],
+          "Errors": []
+        }
+      JSON
+
+    json = JSON.parse(shellunescape(run_command("fetch", "--from", "secret", "KEY1", "KEY2")))
+
+    expected_json = {
+      "secret/KEY1"=>"VALUE1",
+      "secret/KEY2"=>"VALUE2"
+    }
+
+    assert_equal expected_json, json
+  end
+
+  test "fetch without CLI installed" do
+    stub_ticks_with("aws --version 2> /dev/null", succeed: false)
+
+    error = assert_raises RuntimeError do
+      JSON.parse(shellunescape(run_command("fetch", "SECRET1")))
+    end
+    assert_equal "AWS CLI is not installed", error.message
+  end
+
+  private
+    def run_command(*command)
+      stdouted do
+        Kamal::Cli::Secrets.start \
+          [ *command,
+            "-c", "test/fixtures/deploy_with_accessories.yml",
+            "--adapter", "aws_secrets_manager",
+            "--account", "default" ]
+      end
+    end
+end