feat: Initial clean release of CHM

packages/app-cli/app/ResourceServer.ts

@@ -0,0 +1,100 @@
+import Logger, { LoggerWrapper } from '@joplin/utils/Logger';
+import { findAvailablePort } from '@joplin/lib/net-utils';
+import * as http from 'http';
+import * as urlParser from 'url';
+const enableServerDestroy = require('server-destroy');
+
+type LinkHandler = (resourceId: string, response: http.ServerResponse)=> Promise<boolean>;
+
+class ResourceServer {
+	private server_: http.Server | null;
+	private logger_: LoggerWrapper;
+	private port_: number | null;
+	private linkHandler_: LinkHandler | null;
+	private started_: boolean;
+
+	public constructor() {
+		this.server_ = null;
+		this.logger_ = new Logger();
+		this.port_ = null;
+		this.linkHandler_ = null;
+		this.started_ = false;
+	}
+
+	public setLogger(logger: LoggerWrapper) {
+		this.logger_ = logger;
+	}
+
+	public logger() {
+		return this.logger_;
+	}
+
+	public started() {
+		return this.started_;
+	}
+
+	public baseUrl() {
+		if (!this.port_) return '';
+		return `http://127.0.0.1:${this.port_}`;
+	}
+
+	public setLinkHandler(handler: LinkHandler) {
+		this.linkHandler_ = handler;
+	}
+
+	public async start() {
+		this.port_ = await findAvailablePort(require('tcp-port-used'), [9167, 9267, 8167, 8267]);
+		if (!this.port_) {
+			this.logger().error('Could not find available port to start resource server. Please report the error at https://github.com/laurent22/joplin');
+			return;
+		}
+
+		this.server_ = http.createServer();
+
+		this.server_.on('request', async (request, response) => {
+			const writeResponse = (message: string) => {
+				response.write(message);
+				response.end();
+			};
+
+			const url = urlParser.parse(request.url, true);
+			const pathParts = url.pathname.split('/');
+			if (pathParts.length < 2) {
+				writeResponse(`Error: could not get resource ID from path name: ${url.pathname}`);
+				return;
+			}
+			const resourceId = pathParts[1];
+
+			if (!this.linkHandler_) throw new Error('No link handler is defined');
+
+			try {
+				const done = await this.linkHandler_(resourceId, response);
+				if (!done) throw new Error(`Unhandled resource: ${resourceId}`);
+			} catch (error) {
+				response.setHeader('Content-Type', 'text/plain');
+				// eslint-disable-next-line require-atomic-updates
+				response.statusCode = 400;
+				response.write(error.message);
+			}
+
+			response.end();
+		});
+
+		this.server_.on('error', error => {
+			this.logger().error('Resource server:', error);
+		});
+
+		this.server_.listen(this.port_, '127.0.0.1');
+
+		enableServerDestroy(this.server_);
+
+		this.started_ = true;
+	}
+
+	public stop() {
+		if (this.server_) (this.server_ as http.Server & { destroy: ()=> void }).destroy();
+		this.server_ = null;
+	}
+}
+
+export default ResourceServer;