feat: create configuration artifact

Author: AndreaGiulianelli

src/env/config/ConfigurationArtifact.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2023. Smart Operating Block
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package config;
+
+import cartago.Artifact;
+import cartago.OPERATION;
+import infrastructure.configuration.model.Configuration;
+import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.constructor.Constructor;
+import org.yaml.snakeyaml.representer.Representer;
+
+import java.io.BufferedInputStream;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.Objects;
+
+/**
+ * CArtAgO artifact to load the user-provided configuration of the automation management.
+ */
+public class ConfigurationArtifact extends Artifact {
+    private static final String CONFIGURATION_PATH_VARIABLE = "CONFIG_PATH";
+    /**
+     * Initialize the configuration artifact.
+     */
+    void init() {
+        Objects.requireNonNull(System.getenv(CONFIGURATION_PATH_VARIABLE), "Missing configuration path");
+    }
+
+    /**
+     * Operation that loads the configuration provided by the user.
+     */
+    @OPERATION
+    void load() {
+        final Representer represent = new Representer();
+        represent.getPropertyUtils().setSkipMissingProperties(true);
+        final Yaml yaml = new Yaml(new Constructor(Configuration.class), represent);
+        try (
+                BufferedInputStream configInputStream = new BufferedInputStream(
+                        new FileInputStream(System.getenv(CONFIGURATION_PATH_VARIABLE))
+                )
+        ) {
+            final String fileContent = new String(configInputStream.readAllBytes(), StandardCharsets.UTF_8);
+            final Configuration config = yaml.load(fileContent);
+            signal("config", config.getOperatingRoomStandbyMode().isEnabled().toString()); // tobe deleted
+        } catch (IOException e) {
+            throw new IllegalStateException("Impossible to read configuration file", e);
+        }
+    }
+}