Add middleware to support Maven-managed dependencies on Fiori Pipeline

lib/framework.js

@@ -2,13 +2,12 @@ import {parse as parseUrl} from "node:url";
 import http from "node:http";
 import https from "node:https";
 import httpProxy from "http-proxy";
-import {statSync, readFileSync} from "node:fs";
+import {statSync, readFileSync, existsSync} from "node:fs";
 import path from "node:path";
 import {fileURLToPath} from "node:url";
 import yaml from "js-yaml";
 import {Router} from "express";
 import {ErrorMessage} from "./errors.js";
-
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
 export default class Framework {
@@ -547,12 +546,42 @@ export default class Framework {
 		req.url = this.rewriteUrl(req.url);
 		next();
 	}
-
+	/**
+	 * For Maven-managed UI5 libraries (fiori pipeline), dependencies are extracted to the
+	 * target/dependency/META-INF/resources directory inside the project.  This middleware
+	 * returns the file contents if found inside the dependency directory.
+	 *
+	 * @param {http.ClientRequest} req Client request object
+	 * @param {http.ServerResponse} res Server response object
+	 * @param {Function} next Next middleware
+	 * @returns {void}
+	 */
+	middlewareMavenDependencies(req, res, next) {
+		const sMvnDependencyDir = path.resolve("./target/dependency/META-INF/resources");
+		if (req.method !== "GET" || !existsSync(sMvnDependencyDir)) {
+			next();
+			return;
+		}
+		const oReqUrl = parseUrl(req.url);
+		const sPath = oReqUrl.pathname;
+		if (sPath.startsWith("/base/resources")) {
+			const sSearchPath = path.resolve(sMvnDependencyDir + sPath.substring("/base/resources".length));
+			if (existsSync(sSearchPath)) {
+				const oBody = readFileSync(sSearchPath);
+				res.write(oBody);
+				res.statusCode = 200;
+				res.end();
+				return;
+			}
+		}
+		next();
+	}
 	async setupMiddleware() {
 		const config = this.config;
 
 		if (config.ui5.type === "library") {
 			config.ui5._beforeMiddleware = new Router();
+			config.ui5._beforeMiddleware.use(this.middlewareMavenDependencies.bind(this));
 			config.ui5._beforeMiddleware.use(this.beforeMiddlewareRewriteUrl.bind(this));
 			config.beforeMiddleware.push("ui5--beforeMiddleware");
 		}