Allowing empty valued global variables in config file

integrations/src/test/java/io/jenkins/plugins/casc/GlobalNodePropertiesTest.java

@@ -7,15 +7,19 @@
 import static org.hamcrest.core.Is.is;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+import hudson.node_monitors.DiskSpaceMonitorNodeProperty;
 import hudson.slaves.EnvironmentVariablesNodeProperty;
 import hudson.slaves.NodeProperty;
 import hudson.slaves.NodePropertyDescriptor;
+import hudson.tools.ToolLocationNodeProperty;
 import hudson.util.DescribableList;
 import io.jenkins.plugins.casc.misc.ConfiguredWithCode;
 import io.jenkins.plugins.casc.misc.JenkinsConfiguredWithCodeRule;
 import io.jenkins.plugins.casc.misc.junit.jupiter.WithJenkinsConfiguredWithCode;
 import io.jenkins.plugins.casc.model.CNode;
+import java.util.Iterator;
 import java.util.Map;
+import java.util.Map.Entry;
 import java.util.Set;
 import jenkins.model.Jenkins;
 import org.junit.jupiter.api.Test;
@@ -30,14 +34,37 @@ void configure(JenkinsConfiguredWithCodeRule j) {
 
         DescribableList<NodeProperty<?>, NodePropertyDescriptor> nodeProperties = jenkins.getGlobalNodeProperties();
 
-        Set<Map.Entry<String, String>> entries = ((EnvironmentVariablesNodeProperty) nodeProperties.get(0))
+        assertEquals(3, nodeProperties.size());
+
+        Set<Map.Entry<String, String>> envVars = ((EnvironmentVariablesNodeProperty)
+                        nodeProperties.get(EnvironmentVariablesNodeProperty.class))
                 .getEnvVars()
                 .entrySet();
-        assertEquals(1, entries.size());
+        assertEquals(3, envVars.size());
 
-        Map.Entry<String, String> envVar = entries.iterator().next();
+        Iterator<Entry<String, String>> iterator = envVars.iterator();
+        Map.Entry<String, String> envVar = iterator.next();
         assertEquals("FOO", envVar.getKey());
         assertEquals("BAR", envVar.getValue());
+
+        envVar = iterator.next();
+        assertEquals("FOO2", envVar.getKey());
+        assertEquals("", envVar.getValue());
+
+        envVar = iterator.next();
+        assertEquals("FOO3", envVar.getKey());
+        assertEquals("", envVar.getValue());
+
+        DiskSpaceMonitorNodeProperty diskSpace = nodeProperties.get(DiskSpaceMonitorNodeProperty.class);
+        assertEquals("1GiB", diskSpace.getFreeDiskSpaceThreshold());
+        assertEquals("2GiB", diskSpace.getFreeDiskSpaceWarningThreshold());
+        assertEquals("1GiB", diskSpace.getFreeTempSpaceThreshold());
+        assertEquals("2GiB", diskSpace.getFreeTempSpaceWarningThreshold());
+
+        ToolLocationNodeProperty toolLocations = nodeProperties.get(ToolLocationNodeProperty.class);
+        assertEquals(1, toolLocations.getLocations().size());
+        assertEquals("Default", toolLocations.getLocations().get(0).getName());
+        assertEquals("/home/user/bin/git", toolLocations.getLocations().get(0).getHome());
     }
 
     @Test

integrations/src/test/resources/io/jenkins/plugins/casc/GlobalNodePropertiesTest.yml

@@ -1,6 +1,18 @@
 jenkins:
   globalNodeProperties:
+    - diskSpaceMonitor:
+        freeDiskSpaceThreshold: "1GiB"
+        freeDiskSpaceWarningThreshold: "2GiB"
+        freeTempSpaceThreshold: "1GiB"
+        freeTempSpaceWarningThreshold: "2GiB"
     - envVars:
         env:
           - key: FOO
             value: BAR
+          - key: FOO2
+            value: ""
+          - key: FOO3
+    - toolLocation:
+        locations:
+          - home: "/home/user/bin/git"
+            key: "hudson.plugins.git.GitTool$DescriptorImpl@Default"

integrations/src/test/resources/io/jenkins/plugins/casc/GlobalNodePropertiesTestExpected.yml

@@ -1,4 +1,15 @@
+- diskSpaceMonitor:
+    freeDiskSpaceThreshold: "1GiB"
+    freeDiskSpaceWarningThreshold: "2GiB"
+    freeTempSpaceThreshold: "1GiB"
+    freeTempSpaceWarningThreshold: "2GiB"
 - envVars:
     env:
     - key: "FOO"
       value: "BAR"
+    - key: "FOO2"
+    - key: "FOO3"
+- toolLocation:
+    locations:
+    - home: "/home/user/bin/git"
+      key: "hudson.plugins.git.GitTool$DescriptorImpl@Default"

plugin/src/main/java/io/jenkins/plugins/casc/core/GlobalNodePropertiesConfigurator.java

@@ -0,0 +1,61 @@
+package io.jenkins.plugins.casc.core;
+
+import edu.umd.cs.findbugs.annotations.NonNull;
+import hudson.Extension;
+import hudson.slaves.EnvironmentVariablesNodeProperty;
+import hudson.slaves.EnvironmentVariablesNodeProperty.Entry;
+import io.jenkins.plugins.casc.ConfigurationContext;
+import io.jenkins.plugins.casc.ConfiguratorException;
+import io.jenkins.plugins.casc.impl.configurators.DataBoundConfigurator;
+import io.jenkins.plugins.casc.model.CNode;
+import io.jenkins.plugins.casc.model.Mapping;
+import java.util.ArrayList;
+import java.util.List;
+
+@Extension
+public class GlobalNodePropertiesConfigurator extends DataBoundConfigurator<EnvironmentVariablesNodeProperty> {
+
+    public GlobalNodePropertiesConfigurator() {
+        this(EnvironmentVariablesNodeProperty.class);
+    }
+
+    public GlobalNodePropertiesConfigurator(Class<?> clazz) {
+        super(EnvironmentVariablesNodeProperty.class);
+    }
+
+    @NonNull
+    @Override
+    public String getName() {
+        return "globalNodeProperties";
+    }
+
+    @NonNull
+    @Override
+    public EnvironmentVariablesNodeProperty configure(CNode c, ConfigurationContext context)
+            throws ConfiguratorException {
+        Mapping mapping = c.asMapping();
+        List<Entry> variables = getVarsAsList(mapping);
+        return new EnvironmentVariablesNodeProperty(variables);
+    }
+
+    private List<Entry> getVarsAsList(Mapping m) {
+        List<Entry> result = new ArrayList<>();
+        if (m.get("env") != null) {
+            result = m.get("env").asSequence().stream()
+                    .map(pair -> {
+                        if (pair.asMapping().get("key") == null) {
+                            return null;
+                        }
+                        final String key =
+                                pair.asMapping().get("key").asScalar().getValue();
+                        final String value = pair.asMapping().get("value") == null
+                                ? ""
+                                : pair.asMapping().get("value").asScalar().getValue();
+
+                        return new Entry(key, value);
+                    })
+                    .toList();
+        }
+        return result;
+    }
+}