[FEATURE] Server: Add handling for custom middleware

As per RFC 0005: SAP/ui5-tooling#151

lib/middleware/connectUi5Proxy.js

@@ -0,0 +1,9 @@
+const ui5connect = require("connect-openui5");
+
+function createMiddleware() {
+	return ui5connect.proxy({
+		secure: false
+	});
+}
+
+module.exports = createMiddleware;

lib/middleware/discovery.js

@@ -13,12 +13,14 @@ const urlPattern = /\/(app_pages|all_libs|all_tests)(?:[?#].*)?$/;
  * </ul>
  *
  * @module @ui5/server/middleware/discovery
- * @param {Object} resourceCollections Contains the resource reader or collection to access project related files
- * @param {module:@ui5/fs.AbstractReader} resourceCollections.source Resource reader or collection for the source project
- * @param {module:@ui5/fs.AbstractReader} resourceCollections.combo Resource collection which contains the workspace and the project dependencies
+ * @param {Object} parameters Parameters
+ * @param {module:@ui5/fs.AbstractReader} parameters.resources.all Reader or Collection to read resources of the
+ *                                        root project and its dependencies
+ * @param {module:@ui5/fs.AbstractReader} parameters.resources.rootProject Reader or Collection to read resources of
+ *                                        the project the server is started in
  * @returns {Function} Returns a server middleware closure.
  */
-function createMiddleware({resourceCollections}) {
+function createMiddleware({resources}) {
 	return function discoveryMiddleware(req, res, next) {
 		const parts = urlPattern.exec(req.url);
 		const type = parts && parts[1];
@@ -46,7 +48,7 @@ function createMiddleware({resourceCollections}) {
 		}
 
 		if (type === "app_pages") {
-			resourceCollections.source.byGlob("/**/*.{html,htm}").then(function(resources) {
+			resources.rootProject.byGlob("/**/*.{html,htm}").then(function(resources) {
 				resources.forEach(function(resource) {
 					const relPath = resource.getPath().substr(1); // cut off leading "/"
 					response.push({
@@ -56,7 +58,7 @@ function createMiddleware({resourceCollections}) {
 				sendResponse();
 			});
 		} else if (type === "all_libs") {
-			resourceCollections.combo.byGlob([
+			resources.all.byGlob([
 				"/resources/**/*.library"
 			]).then(function(resources) {
 				resources.forEach(function(resource) {
@@ -72,8 +74,8 @@ function createMiddleware({resourceCollections}) {
 			});
 		} else if (type === "all_tests") {
 			Promise.all([
-				resourceCollections.combo.byGlob("/resources/**/*.library"),
-				resourceCollections.combo.byGlob("/test-resources/**/*.{html,htm}")
+				resources.all.byGlob("/resources/**/*.library"),
+				resources.all.byGlob("/test-resources/**/*.{html,htm}")
 			]).then(function(results) {
 				const libraryResources = results[0];
 				const testPageResources = results[1];

lib/middleware/middlewareRepository.js

@@ -0,0 +1,44 @@
+const middlewares = {
+	compression: "compression",
+	cors: "cors",
+	csp: "./csp",
+	serveResources: "./serveResources",
+	serveIndex: "./serveIndex",
+	discovery: "./discovery",
+	versionInfo: "./versionInfo",
+	connectUi5Proxy: "./connectUi5Proxy",
+	serveThemes: "./serveThemes",
+	nonReadRequests: "./nonReadRequests"
+};
+
+function getMiddleware(middlewareName) {
+	const middlewarePath = middlewares[middlewareName];
+
+	if (!middlewarePath) {
+		throw new Error(`middlewareRepository: Unknown Middleware ${middlewareName}`);
+	}
+	return require(middlewarePath);
+}
+
+function addMiddleware(name, middlewarePath) {
+	if (middlewares[name]) {
+		throw new Error(`middlewareRepository: Middleware ${name} already registered`);
+	}
+	middlewares[name] = middlewarePath;
+}
+
+function getAllMiddleware() {
+	const modules = {};
+	for (const middlewareName in middlewares) {
+		if (middlewares.hasOwnProperty(middlewareName)) {
+			modules[middlewareName] = require(middlewares[middlewareName]);
+		}
+	}
+	return middlewares;
+}
+
+module.exports = {
+	getMiddleware: getMiddleware,
+	addMiddleware: addMiddleware,
+	getAllMiddleware: getAllMiddleware
+};

lib/middleware/serveIndex.js

@@ -133,16 +133,16 @@ function createContent(path, resourceInfos) {
  * Creates and returns the middleware to serve a resource index.
  *
  * @module @ui5/server/middleware/serveIndex
- * @param {Object} resourceCollections Contains the resource reader or collection to access project related files
- * @param {module:@ui5/fs.AbstractReader} resourceCollections.combo Resource collection which contains the workspace and the project dependencies
+ * @param {Object} resources Contains the resource reader or collection to access project related files
+ * @param {module:@ui5/fs.AbstractReader} resources.all Resource collection which contains the workspace and the project dependencies
  * @returns {Function} Returns a server middleware closure.
  */
-function createMiddleware({resourceCollections}) {
+function createMiddleware({resources}) {
 	return function serveIndex(req, res, next) {
 		const pathname = parseurl(req).pathname;
 		log.verbose("\n Listing index of " + pathname);
 		const glob = pathname + (pathname.endsWith("/") ? "*" : "/*");
-		resourceCollections.combo.byGlob(glob, {nodir: false}).then((resources) => {
+		resources.all.byGlob(glob, {nodir: false}).then((resources) => {
 			if (!resources || resources.length == 0) { // Not found
 				next();
 				return;

lib/middleware/serveResources.js

@@ -19,14 +19,14 @@ function isFresh(req, res) {
  * Creates and returns the middleware to serve application resources.
  *
  * @module @ui5/server/middleware/serveResources
- * @param {Object} resourceCollections Contains the resource reader or collection to access project related files
- * @param {module:@ui5/fs.AbstractReader} resourceCollections.combo Resource collection which contains the workspace and the project dependencies
+ * @param {Object} resources Contains the resource reader or collection to access project related files
+ * @param {module:@ui5/fs.AbstractReader} resources.all Resource collection which contains the workspace and the project dependencies
  * @returns {Function} Returns a server middleware closure.
  */
-function createMiddleware({resourceCollections}) {
+function createMiddleware({resources}) {
 	return function serveResources(req, res, next) {
 		const pathname = parseurl(req).pathname;
-		resourceCollections.combo.byPath(pathname).then(function(resource) {
+		resources.all.byPath(pathname).then(function(resource) {
 			if (!resource) { // Not found
 				next();
 				return;

lib/middleware/serveThemes.js

@@ -18,13 +18,13 @@ const themeRequest = /^(.*\/)library(?:(\.css)|(-RTL\.css)|(-parameters\.json))$
  * The theme is built in realtime. If a less file was modified, the theme build is triggered to rebuild the theme.
  *
  * @module @ui5/server/middleware/serveThemes
- * @param {Object} resourceCollections Contains the resource reader or collection to access project related files
- * @param {module:@ui5/fs.AbstractReader} resourceCollections.combo Resource collection which contains the workspace and the project dependencies
+ * @param {Object} resources Contains the resource reader or collection to access project related files
+ * @param {module:@ui5/fs.AbstractReader} resources.all Resource collection which contains the workspace and the project dependencies
  * @returns {Function} Returns a server middleware closure.
  */
-function createMiddleware({resourceCollections}) {
+function createMiddleware({resources}) {
 	const builder = new themeBuilder.ThemeBuilder({
-		fs: fsInterface(resourceCollections.combo)
+		fs: fsInterface(resources.all)
 	});
 
 	return function theme(req, res, next) {
@@ -46,7 +46,7 @@ function createMiddleware({resourceCollections}) {
 		}
 
 		const sourceLessPath = themeReq[1] + "library.source.less";
-		resourceCollections.combo.byPath(sourceLessPath).then((sourceLessResource) => {
+		resources.all.byPath(sourceLessPath).then((sourceLessResource) => {
 			if (!sourceLessResource) { // Not found
 				next();
 				return;

lib/middleware/versionInfo.js

@@ -4,13 +4,13 @@ const createVersionInfoProcessor = require("@ui5/builder").processors.versionInf
  * Creates and returns the middleware to create the version info as json object.
  *
  * @module @ui5/server/middleware/versionInfo
- * @param {Object} resourceCollections Contains the resource reader or collection to access project related files
- * @param {module:@ui5/fs.AbstractReader} resourceCollections.dependencies Resource collection which contains the project dependencies
+ * @param {Object} resources Contains the resource reader or collection to access project related files
+ * @param {module:@ui5/fs.AbstractReader} resources.dependencies Resource collection which contains the project dependencies
  * @returns {Function} Returns a server middleware closure.
  */
-function createMiddleware({resourceCollections, tree: project}) {
+function createMiddleware({resources, tree: project}) {
 	return function versionInfo(req, res, next) {
-		resourceCollections.dependencies.byGlob("/**/.library")
+		resources.dependencies.byGlob("/**/.library")
 			.then((resources) => {
 				resources.sort((a, b) => {
 					return a._project.metadata.name.localeCompare(b._project.metadata.name);