From f7d1d682407403e777e5c298d4154cbe0fbe3284 Mon Sep 17 00:00:00 2001
From: Rohan Kumar <rohaan@redhat.com>
Date: Thu, 7 Nov 2019 23:31:00 +0530
Subject: [PATCH] + Resolving template placeholders only in kubernetes.yaml but
 not individual   template files (which will be resolved by helm mojo) + HELM
 mode does not support parameters without value

Ported PR https://github.com/fabric8io/fabric8-maven-plugin/pull/1713
Ported PR https://github.com/fabric8io/fabric8-maven-plugin/pull/1733
---
 .../kit/common/util/KubernetesHelper.java     | 47 +++++++++++++++++++
 .../maven/plugin/mojo/build/ResourceMojo.java |  2 +
 2 files changed, 49 insertions(+)

diff --git a/jkube-kit/common/src/main/java/io/jkube/kit/common/util/KubernetesHelper.java b/jkube-kit/common/src/main/java/io/jkube/kit/common/util/KubernetesHelper.java
index b9461ae135..e5ed21f765 100644
--- a/jkube-kit/common/src/main/java/io/jkube/kit/common/util/KubernetesHelper.java
+++ b/jkube-kit/common/src/main/java/io/jkube/kit/common/util/KubernetesHelper.java
@@ -20,6 +20,7 @@
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.net.UnknownHostException;
+import java.nio.charset.Charset;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
@@ -80,7 +81,9 @@
 import io.fabric8.openshift.api.model.Template;
 import io.jkube.kit.common.KitLogger;
 import io.jkube.kit.common.ResourceFileType;
+import org.apache.commons.io.FileUtils;
 import org.apache.commons.lang3.StringUtils;
+import org.apache.maven.plugin.MojoExecutionException;
 
 /**
  * @author roland
@@ -712,5 +715,49 @@ public static Pod getNewestPod(Collection<Pod> pods) {
         });
         return sortedPods.get(sortedPods.size() - 1);
     }
+
+    public static void resolveTemplateVariablesIfAny(KubernetesList resources, File targetDir) throws IllegalStateException {
+        Template template = findTemplate(resources);
+        if (template != null) {
+            List<io.fabric8.openshift.api.model.Parameter> parameters = template.getParameters();
+            if (parameters == null || parameters.isEmpty()) {
+                return;
+            }
+            File kubernetesYaml = new File(targetDir, "kubernetes.yml");
+            resolveTemplateVariables(parameters, kubernetesYaml);
+        }
+    }
+
+    public static void resolveTemplateVariables(List<io.fabric8.openshift.api.model.Parameter> parameters, File kubernetesYaml) throws IllegalStateException {
+        String text;
+        try {
+            text = FileUtils.readFileToString(kubernetesYaml, Charset.defaultCharset());
+        } catch (IOException e) {
+            throw new IllegalStateException("Failed to load " + kubernetesYaml + " so we can replace template expressions " + e, e);
+        }
+        String original = text;
+        for (io.fabric8.openshift.api.model.Parameter parameter : parameters) {
+            String from = "${" + parameter.getName() + "}";
+            String to = parameter.getValue();
+            if (to == null) {
+                throw new IllegalStateException("Missing value for HELM template parameter " + from + " in " + kubernetesYaml);
+            }
+            text = text.replace(from, to);
+        }
+        if (!original.equals(text)) {
+            try {
+                FileUtils.writeStringToFile(kubernetesYaml, text, Charset.defaultCharset());
+            } catch (IOException e) {
+                throw new IllegalStateException("Failed to save " + kubernetesYaml + " after replacing template expressions " +e, e);
+            }
+        }
+    }
+
+    public static Template findTemplate(KubernetesList resources) {
+        return (Template) resources.getItems().stream()
+                .filter(template -> template instanceof Template)
+                .findFirst()
+                .orElse(null);
+    }
 }
 
diff --git a/kubernetes-maven-plugin/plugin/src/main/java/io/jkube/maven/plugin/mojo/build/ResourceMojo.java b/kubernetes-maven-plugin/plugin/src/main/java/io/jkube/maven/plugin/mojo/build/ResourceMojo.java
index 5a7ad89ec5..5deff69683 100644
--- a/kubernetes-maven-plugin/plugin/src/main/java/io/jkube/maven/plugin/mojo/build/ResourceMojo.java
+++ b/kubernetes-maven-plugin/plugin/src/main/java/io/jkube/maven/plugin/mojo/build/ResourceMojo.java
@@ -636,6 +636,8 @@ protected void writeResources(KubernetesList resources, ResourceClassifier class
         File file =
             writeResourcesIndividualAndComposite(resources, resourceFileBase, this.resourceFileType, log, generateRoute);
 
+        KubernetesHelper.resolveTemplateVariablesIfAny(resources, this.targetDir);
+
         // Attach it to the Maven reactor so that it will also get deployed
         projectHelper.attachArtifact(project, this.resourceFileType.getArtifactType(), classifier.getValue(), file);
     }