support installing node version from package.json engines

fixes #798

frontend-maven-plugin/src/it/node-version-from-engines/package.json

@@ -0,0 +1,13 @@
+{
+  "name": "example",
+  "version": "0.0.1",
+  "engines": {
+    "node": ">=10.3 <15"
+  },
+  "dependencies": {
+    "less": "~3.0.2"
+  },
+  "scripts": {
+    "prebuild": "npm install"
+  }
+}

frontend-maven-plugin/src/it/node-version-from-engines/pom.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.github.eirslett</groupId>
+    <artifactId>example</artifactId>
+    <version>0</version>
+    <packaging>pom</packaging>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>com.github.eirslett</groupId>
+                <artifactId>frontend-maven-plugin</artifactId>
+                <!-- NB! Set <version> to the latest released version of frontend-maven-plugin, like in README.md -->
+                <version>@project.version@</version>
+
+                <configuration>
+                    <installDirectory>target</installDirectory>
+                </configuration>
+
+                <executions>
+
+                    <execution>
+                        <id>install node and npm</id>
+                        <goals>
+                            <goal>install-node-and-npm</goal>
+                        </goals>
+                        <configuration>
+                            <nodeVersion>engines</nodeVersion>
+                        </configuration>
+                    </execution>
+
+                    <execution>
+                        <id>npm install</id>
+                        <goals>
+                            <goal>npm</goal>
+                        </goals>
+                        <!-- Optional configuration which provides for running any npm command -->
+                        <configuration>
+                            <arguments>install</arguments>
+                        </configuration>
+                    </execution>
+
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

frontend-maven-plugin/src/it/node-version-from-engines/verify.groovy

@@ -0,0 +1,9 @@
+assert new File(basedir, 'target/node').exists() : "Node was not installed in the custom install directory";
+assert new File(basedir, 'node_modules').exists() : "Node modules were not installed in the base directory";
+assert new File(basedir, 'target/node/npm').exists() : "npm was not copied to the node directory";
+
+import org.codehaus.plexus.util.FileUtils;
+
+String buildLog = FileUtils.fileRead(new File(basedir, 'build.log'));
+
+assert buildLog.contains('BUILD SUCCESS') : 'build was not successful'

frontend-maven-plugin/src/main/java/com/github/eirslett/maven/plugins/frontend/mojo/InstallNodeAndNpmMojo.java

@@ -78,28 +78,28 @@ public void execute(FrontendPluginFactory factory) throws InstallationException
         String npmDownloadRoot = getNpmDownloadRoot();
         Server server = MojoUtils.decryptServer(serverId, session, decrypter);
         if (null != server) {
-            factory.getNodeInstaller(proxyConfig)
+            String installedNodeVersion=factory.getNodeInstaller(proxyConfig)
                 .setNodeVersion(nodeVersion)
                 .setNodeDownloadRoot(nodeDownloadRoot)
                 .setNpmVersion(npmVersion)
                 .setUserName(server.getUsername())
                 .setPassword(server.getPassword())
                 .install();
             factory.getNPMInstaller(proxyConfig)
-                .setNodeVersion(nodeVersion)
+                .setNodeVersion(installedNodeVersion)
                 .setNpmVersion(npmVersion)
                 .setNpmDownloadRoot(npmDownloadRoot)
                 .setUserName(server.getUsername())
                 .setPassword(server.getPassword())
                 .install();
         } else {
-            factory.getNodeInstaller(proxyConfig)
+            String installedNodeVersion=factory.getNodeInstaller(proxyConfig)
                 .setNodeVersion(nodeVersion)
                 .setNodeDownloadRoot(nodeDownloadRoot)
                 .setNpmVersion(npmVersion)
                 .install();
             factory.getNPMInstaller(proxyConfig)
-                .setNodeVersion(this.nodeVersion)
+                .setNodeVersion(installedNodeVersion)
                 .setNpmVersion(this.npmVersion)
                 .setNpmDownloadRoot(npmDownloadRoot)
                 .install();

frontend-plugin-core/pom.xml

@@ -11,6 +11,12 @@
     <packaging>jar</packaging>
 
     <dependencies>
+        <dependency>
+            <groupId>com.vdurmont</groupId>
+            <artifactId>semver4j</artifactId>
+            <version>3.1.0</version>
+        </dependency>
+
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-core</artifactId>

frontend-plugin-core/src/main/java/com/github/eirslett/maven/plugins/frontend/lib/NodeInstaller.java

@@ -7,7 +7,13 @@
 import java.nio.file.Files;
 import java.nio.file.StandardCopyOption;
 import java.util.Arrays;
-
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.vdurmont.semver4j.Requirement;
+import com.vdurmont.semver4j.Semver;
 import org.apache.commons.io.FileUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -28,6 +34,8 @@ public class NodeInstaller {
 
     private final FileDownloader fileDownloader;
 
+    private Requirement nodeVersionRequirement;
+
     NodeInstaller(InstallConfig config, ArchiveExtractor archiveExtractor, FileDownloader fileDownloader) {
         this.logger = LoggerFactory.getLogger(getClass());
         this.config = config;
@@ -74,13 +82,65 @@ private boolean npmProvided() throws InstallationException {
         return false;
     }
 
-    public void install() throws InstallationException {
+    public String install() throws InstallationException {
         // use static lock object for a synchronized block
         synchronized (LOCK) {
             if (this.nodeDownloadRoot == null || this.nodeDownloadRoot.isEmpty()) {
                 this.nodeDownloadRoot = this.config.getPlatform().getNodeDownloadRoot();
             }
+
+            if ("engines".equals(this.nodeVersion)) {
+                try {
+                    File packageFile = new File(this.config.getWorkingDirectory(), "package.json");
+                    HashMap<String, Object> data = new ObjectMapper().readValue(packageFile, HashMap.class);
+                    if (data.containsKey("engines")) {
+                        HashMap<String, Object> engines = (HashMap<String, Object>) data.get("engines");
+                        if (engines.containsKey("node")) {
+                            this.nodeVersionRequirement = Requirement.buildNPM((String) engines.get("node"));
+                        } else {
+                            this.logger.info("Could not read node from engines from package.json");
+                        }
+                    } else {
+                        this.logger.info("Could not read engines from package.json");
+                    }
+                } catch (IOException e) {
+                    throw new InstallationException("Could not read node engine version from package.json", e);
+                }
+            }
+
             if (!nodeIsAlreadyInstalled()) {
+                if (this.nodeVersionRequirement != null) {
+                    // download available node versions
+                    try {
+                        String downloadUrl = this.nodeDownloadRoot
+                                + "index.json";
+
+                        File tmpDirectory = getTempDirectory();
+
+                        File archive = File.createTempFile("node_versions", ".json", tmpDirectory);
+
+                        downloadFile(downloadUrl, archive, this.userName, this.password);
+
+                        HashMap<String, Object>[] data = new ObjectMapper().readValue(archive, HashMap[].class);
+
+                        List<String> nodeVersions = new LinkedList<>();
+                        for (HashMap<String, Object> d : data) {
+                            if (d.containsKey("version")) {
+                                nodeVersions.add((String) d.get("version"));
+                            }
+                        }
+
+                        // we want the oldest possible version, that satisfies the requirements
+                        Collections.reverse(nodeVersions);
+
+                        logger.debug("Available node versions: {}", nodeVersions);
+                        this.nodeVersion = nodeVersions.stream().filter(version -> nodeVersionRequirement.isSatisfiedBy(new Semver(version, Semver.SemverType.NPM))).findFirst().orElseThrow(() -> new InstallationException("Could not find matching node version satisfying requirement " + this.nodeVersionRequirement));
+                        this.logger.info("Found matching node version {} satisfying requirement {}.", this.nodeVersion, this.nodeVersionRequirement);
+                    } catch (IOException | DownloadException e) {
+                        throw new InstallationException("Could not get available node versions.", e);
+                    }
+                }
+
                 this.logger.info("Installing node version {}", this.nodeVersion);
                 if (!this.nodeVersion.startsWith("v")) {
                     this.logger.warn("Node version does not start with naming convention 'v'.");
@@ -96,6 +156,8 @@ public void install() throws InstallationException {
                 }
             }
         }
+
+        return nodeVersion;
     }
 
     private boolean nodeIsAlreadyInstalled() {
@@ -104,14 +166,19 @@ private boolean nodeIsAlreadyInstalled() {
             File nodeFile = executorConfig.getNodePath();
             if (nodeFile.exists()) {
                 final String version =
-                    new NodeExecutor(executorConfig, Arrays.asList("--version"), null).executeAndGetResult(logger);
+                        new NodeExecutor(executorConfig, Arrays.asList("--version"), null).executeAndGetResult(logger);
 
-                if (version.equals(this.nodeVersion)) {
+                if (nodeVersionRequirement != null && nodeVersionRequirement.isSatisfiedBy(new Semver(version, Semver.SemverType.NPM))) {
+                    //update version with installed version
+                    this.nodeVersion = version;
+                    this.logger.info("Node {} matches required version range {} installed.", version, nodeVersionRequirement);
+                    return true;
+                } else if (version.equals(this.nodeVersion)) {
                     this.logger.info("Node {} is already installed.", version);
                     return true;
                 } else {
                     this.logger.info("Node {} was installed, but we need version {}", version,
-                        this.nodeVersion);
+                            this.nodeVersion);
                     return false;
                 }
             } else {