Refactor certbot plugins install

- Added a script to install every single plugin, used in development and debugging
- Improved certbot plugin install commands
- Adjusted some version for plugins to install properly
- It's noted that some plugins require deps that do not match other plugins,
  however these use cases should be extremely rare

backend/lib/certbot.js

@@ -0,0 +1,46 @@
+const dnsPlugins = require('../global/certbot-dns-plugins.json');
+const utils      = require('./utils');
+const error      = require('./error');
+const logger     = require('../logger').certbot;
+
+// const letsencryptStaging = config.useLetsencryptStaging();
+// const letsencryptConfig  = '/etc/letsencrypt.ini';
+// const certbotCommand     = 'certbot';
+
+// const acmeVersion  = '1.32.0';
+const CERTBOT_VERSION_REPLACEMENT = '$(certbot --version | grep -Eo \'[0-9](\\.[0-9]+)+\')';
+
+const certbot = {
+
+	/**
+	 * Installs a cerbot plugin given the key for the object from
+	 * ../global/certbot-dns-plugins.json
+	 *
+	 * @param   {string}  pluginKey
+	 * @returns {Object}
+	 */
+	installPlugin: async function (pluginKey) {
+		if (typeof dnsPlugins[pluginKey] === 'undefined') {
+			// throw Error(`Certbot plugin ${pluginKey} not found`);
+			throw new error.ItemNotFoundError(pluginKey);
+		}
+
+		const plugin = dnsPlugins[pluginKey];
+		logger.start(`Installing ${pluginKey}...`);
+
+		plugin.version      = plugin.version.replace(/{{certbot-version}}/g, CERTBOT_VERSION_REPLACEMENT);
+		plugin.dependencies = plugin.dependencies.replace(/{{certbot-version}}/g, CERTBOT_VERSION_REPLACEMENT);
+
+		const cmd = '. /opt/certbot/bin/activate && pip install --no-cache-dir ' + plugin.dependencies + ' ' + plugin.package_name + plugin.version + ' ' + ' && deactivate';
+		return utils.exec(cmd)
+			.then((result) => {
+				logger.complete(`Installed ${pluginKey}`);
+				return result;
+			})
+			.catch((err) => {
+				throw err;
+			});
+	},
+};
+
+module.exports = certbot;

backend/lib/error.js

@@ -82,7 +82,16 @@ module.exports = {
 		this.message  = message;
 		this.public   = false;
 		this.status   = 400;
-	}
+	},
+
+	CommandError: function (stdErr, code, previous) {
+		Error.captureStackTrace(this, this.constructor);
+		this.name     = this.constructor.name;
+		this.previous = previous;
+		this.message  = stdErr;
+		this.code     = code;
+		this.public   = false;
+	},
 };
 
 _.forEach(module.exports, function (error) {

backend/lib/utils.js

@@ -3,23 +3,27 @@ const exec       = require('child_process').exec;
 const execFile   = require('child_process').execFile;
 const { Liquid } = require('liquidjs');
 const logger     = require('../logger').global;
+const error      = require('./error');
 
 module.exports = {
 
-	/**
-	 * @param   {String} cmd
-	 * @returns {Promise}
-	 */
-	exec: function (cmd) {
-		return new Promise((resolve, reject) => {
-			exec(cmd, function (err, stdout, /*stderr*/) {
-				if (err && typeof err === 'object') {
-					reject(err);
+	exec: async function(cmd, options = {}) {
+		logger.debug('CMD:', cmd);
+
+		const { stdout, stderr } = await new Promise((resolve, reject) => {
+			const child = exec(cmd, options, (isError, stdout, stderr) => {
+				if (isError) {
+					reject(new error.CommandError(stderr, isError));
 				} else {
-					resolve(stdout.trim());
+					resolve({ stdout, stderr });
 				}
 			});
+
+			child.on('error', (e) => {
+				reject(new error.CommandError(stderr, 1, e));
+			});
 		});
+		return stdout;
 	},
 
 	/**
@@ -28,7 +32,8 @@ module.exports = {
 	 * @returns {Promise}
 	 */
 	execFile: function (cmd, args) {
-		logger.debug('CMD: ' + cmd + ' ' + (args ? args.join(' ') : ''));
+		// logger.debug('CMD: ' + cmd + ' ' + (args ? args.join(' ') : ''));
+
 		return new Promise((resolve, reject) => {
 			execFile(cmd, args, function (err, stdout, /*stderr*/) {
 				if (err && typeof err === 'object') {