[FIX] ApplicationFormatter: detect the namespace for Maven placeholders

When the manifest.json contains a Maven placeholder the namespace cannot
be detected properly. With this extension the namespace can be resolved
from the pom.xml from the pom entries or Maven properties.

lib/types/application/ApplicationFormatter.js

@@ -4,11 +4,12 @@ const fs = require("graceful-fs");
 const {promisify} = require("util");
 const readFile = promisify(fs.readFile);
 const AbstractFormatter = require("../AbstractFormatter");
+let readXML; // lazy definition of the readXML function (see readPOM)
 
 class ApplicationFormatter extends AbstractFormatter {
 	/**
 	 * Validates the project and retrieves its manifest
-  *
+	 *
 	 * @param {Object} project
 	 * @returns {Promise} when validated and manifest has been read
 	 */
@@ -19,34 +20,85 @@ class ApplicationFormatter extends AbstractFormatter {
 				"/": project.resources.configuration.paths.webapp
 			};
 
-			return this.readManifest(project).then(function(manifest) {
-				if (!manifest["sap.app"] || !manifest["sap.app"].id) {
+			return this.readManifest(project).then((manifest) => {
+				// check for a proper sap.app/id in manifest.json to determine namespace
+				const appId = manifest["sap.app"] && manifest["sap.app"].id;
+				if (!appId) {
 					log.warn(`No "sap.app" ID configuration found in manifest of project ${project.metadata.name}`);
 					return;
 				}
-				project.metadata.namespace = manifest["sap.app"].id.replace(/\./g, "/");
-			}).catch((err) => {
+				return appId;
+			}, (err) => {
 				log.verbose(`No manifest found for project ${project.metadata.name}.`);
+			}).then((appId) => {
+				// check app id for being a Maven placeholder and try to read the value from the pom.xml
+				const parts = appId && appId.match(/^\$\{(.*)\}$/);
+				if (parts) {
+					log.verbose(`"sap.app" ID configuration contains Maven placeholder "${parts[1]}". Resolving from pom.xml...`);
+					return this.readPOM(project).then((pom) => {
+						let mvnAppId;
+						if (pom.project && pom.project.properties && pom.project.properties[parts[1]]) {
+							mvnAppId = pom.project.properties[parts[1]];
+						} else {
+							let obj = pom;
+							parts[1].split(".").forEach((part) => {
+								obj = obj && obj[part];
+							});
+							mvnAppId = obj;
+						}
+						if (!mvnAppId) {
+							log.warn(`"sap.app" ID configuration couldn't be resolved from Maven property "${parts[1]}" of pom.xml of project ${project.metadata.name}`);
+							return;
+						}
+						return mvnAppId;
+					}, (err) => {
+						log.verbose(`No or invalid pom.xml found for project ${project.metadata.name}.`);
+					});
+				}
+				return appId;
+			}).then((appId) => {
+				if (appId) {
+					project.metadata.namespace = appId.replace(/\./g, "/");
+					log.verbose(`"sap.app" ID configuration found and set as namespace ${project.metadata.namespace} for project ${project.metadata.name}.`);
+				}
 			});
 		});
 	}
 
 	/**
 	 * Reads the manifest
-  *
+	 *
 	 * @param {Object} project
 	 * @returns {Promise<Object>} resolves with the json object
 	 */
 	readManifest(project) {
-		return readFile(path.join(project.path, project.resources.pathMappings["/"], "manifest.json"))
+		return readFile(path.join(project.path, project.resources.pathMappings["/"], "manifest.json"), "utf-8")
 			.then((file) => {
 				return JSON.parse(file);
 			});
 	}
 
+	/**
+	 * Reads the pom.xml file
+	 *
+	 * @param {Object} project
+	 * @returns {Promise<Object>} resolves with the XML document from the pom.xml
+	 */
+	readPOM(project) {
+		if (!readXML) {
+			const xml2js = require("xml2js");
+			const parser = new xml2js.Parser({
+				explicitArray: false,
+				ignoreAttrs: true
+			});
+			readXML = promisify(parser.parseString);
+		}
+		return readFile(path.join(project.path, "pom.xml"), "utf-8").then(readXML);
+	}
+
 	/**
 	 * Validates a project
-  *
+	 *
 	 * @param {Object} project
 	 * @returns {Promise} resolves if successfully validated
 	 * @throws {Error} if validation fails

test/expected/build/application.h/dest/manifest.json

@@ -2,7 +2,7 @@
     "_version": "1.1.0",
     "sap.app": {
         "_version": "1.1.0",
-        "id": "application.g",
+        "id": "${project.artifactId}",
         "type": "application",
         "applicationVersion": {
             "version": "1.2.2"

test/fixtures/application.h/pom.xml

@@ -0,0 +1,41 @@
+<?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/maven-v4_0_0.xsd">
+
+
+	<!--**************************************************************************
+	* POM SECTION: Maven Model Version Settings
+	***************************************************************************-->
+
+	<modelVersion>4.0.0</modelVersion>
+
+
+	<!--**************************************************************************
+	* POM SECTION: Maven Settings
+	***************************************************************************-->
+
+	<groupId>com.sap.test</groupId>
+	<artifactId>application.h</artifactId>
+	<version>1.0.0</version>
+	<packaging>war</packaging>
+
+
+	<!--**************************************************************************
+	* POM SECTION: Project Settings
+	***************************************************************************-->
+
+	<name>application.h</name>
+	<description>Simple SAPUI5 based application</description>
+
+
+	<!--**************************************************************************
+	* POM SECTION: Properties Settings
+	***************************************************************************-->
+
+	<properties>
+
+		<componentName>application.h</componentName>
+
+	</properties>
+
+
+</project>

test/fixtures/application.h/webapp-project.artifactId/manifest.json

@@ -0,0 +1,13 @@
+{
+    "_version": "1.1.0",
+    "sap.app": {
+        "_version": "1.1.0",
+        "id": "${project.artifactId}",
+        "type": "application",
+        "applicationVersion": {
+            "version": "1.2.2"
+        },
+        "embeds": ["embedded"],
+        "title": "{{title}}"
+    }
+}

test/fixtures/application.h/webapp-properties.appId/manifest.json

@@ -0,0 +1,13 @@
+{
+    "_version": "1.1.0",
+    "sap.app": {
+        "_version": "1.1.0",
+        "id": "${appId}",
+        "type": "application",
+        "applicationVersion": {
+            "version": "1.2.2"
+        },
+        "embeds": ["embedded"],
+        "title": "{{title}}"
+    }
+}

test/fixtures/application.h/webapp-properties.componentName/manifest.json

@@ -0,0 +1,13 @@
+{
+    "_version": "1.1.0",
+    "sap.app": {
+        "_version": "1.1.0",
+        "id": "${componentName}",
+        "type": "application",
+        "applicationVersion": {
+            "version": "1.2.2"
+        },
+        "embeds": ["embedded"],
+        "title": "{{title}}"
+    }
+}

test/fixtures/application.h/webapp/manifest.json

@@ -2,7 +2,7 @@
     "_version": "1.1.0",
     "sap.app": {
         "_version": "1.1.0",
-        "id": "application.g",
+        "id": "${project.artifactId}",
         "type": "application",
         "applicationVersion": {
             "version": "1.2.2"

test/lib/types/application/ApplicationFormatter.js

@@ -155,3 +155,54 @@ test("format: set namespace to id", async (t) => {
 	t.deepEqual(project.metadata.namespace, "my/id",
 		"namespace was successfully set since readManifest provides the correct object structure");
 });
+
+const applicationHPath = path.join(__dirname, "..", "..", "..", "fixtures", "application.h");
+const applicationHTree = {
+	id: "application.h",
+	version: "1.0.0",
+	path: applicationHPath,
+	dependencies: [],
+	_level: 0,
+	specVersion: "0.1",
+	type: "application",
+	metadata: {
+		name: "application.h"
+	},
+	resources: {
+		configuration: {
+			paths: {
+				webapp: "webapp"
+			}
+		}
+	}
+};
+
+test("namespace: detect namespace from pom.xml via ${project.artifactId}", async (t) => {
+	const myProject = clone(applicationHTree);
+	myProject.resources.configuration.paths.webapp = "webapp-project.artifactId";
+	const applicationFormatter = new ApplicationFormatter();
+
+	await applicationFormatter.format(myProject);
+	t.deepEqual(myProject.metadata.namespace, "application/h",
+		"namespace was successfully set since readManifest provides the correct object structure");
+});
+
+test("namespace: detect namespace from pom.xml via ${componentName} from properties", async (t) => {
+	const myProject = clone(applicationHTree);
+	myProject.resources.configuration.paths.webapp = "webapp-properties.componentName";
+	const applicationFormatter = new ApplicationFormatter();
+
+	await applicationFormatter.format(myProject);
+	t.deepEqual(myProject.metadata.namespace, "application/h",
+		"namespace was successfully set since readManifest provides the correct object structure");
+});
+
+test("namespace: detect namespace from pom.xml via ${appId} from properties", async (t) => {
+	const myProject = clone(applicationHTree);
+	myProject.resources.configuration.paths.webapp = "webapp-properties.appId";
+	const applicationFormatter = new ApplicationFormatter();
+
+	await applicationFormatter.format(myProject);
+	t.falsy(myProject.metadata.namespace,
+		"namespace is falsy since readManifest resolves with an empty object");
+});