fix various formatting,

add interface for generic backends,
add interfaces for DB and AUTH type backends,
implement basic user password change method

src/backends/paasldap.js

@@ -1,3 +1,53 @@
-export default class PAASLDAP {
+import axios from "axios";
+import { AUTH_BACKEND } from "./backends.js";
 
+export default class PAASLDAP extends AUTH_BACKEND {
+	#url = null;
+
+	constructor (config) {
+		super();
+		this.#url = config.url;
+	}
+
+	/**
+	 * Send HTTP request to paas-LDAP API.
+	 * @param {*} path  HTTP path, prepended with the paas-LDAP API base url
+	 * @param {*} method HTTP method
+	 * @param {*} body body parameters and data to be sent. Optional.
+	 * @returns {Object} HTTP response object or HTTP error object.
+	 */
+	async #request (path, method, auth = null, body = null) {
+		const url = `${this.#url}${path}`;
+		const content = {
+			method,
+			mode: "cors",
+			credentials: "include",
+			headers: {
+				"Content-Type": "application/x-www-form-urlencoded"
+			},
+			data: body
+		};
+
+		if (auth) {
+			content.data.binduser = auth.binduser;
+			content.data.bindpass = auth.bindpass;
+		}
+
+		try {
+			return await axios.request(url, content);
+		}
+		catch (error) {
+			error.ok = false;
+			error.status = 500;
+			error.data = {
+				error: error.code
+			};
+			return error;
+		}
+	}
+
+	async modUser (userid, attributes, params = null) {
+		const bind = { binduser: params.binduser, bindpass: params.bindpass };
+		return await this.#request(`/users/${userid}`, "POST", bind, attributes);
+	}
 }