Notes/src/services/auth.ts

"use strict";

import etapiTokenService from "./etapi_tokens.js";
import log from "./log.js";
import sqlInit from "./sql_init.js";
import { isElectron } from "./utils.js";
import passwordEncryptionService from "./encryption/password_encryption.js";
import config from "./config.js";
import passwordService from "./encryption/password.js";
import type { NextFunction, Request, Response } from "express";

const noAuthentication = config.General && config.General.noAuthentication === true;

function checkAuth(req: Request, res: Response, next: NextFunction) {
    if (!sqlInit.isDbInitialized()) {
        res.redirect("setup");
    } else if (!req.session.loggedIn && !isElectron && !noAuthentication) {
        res.redirect("login");
    } else {
        next();
    }
}

// for electron things which need network stuff
//  currently, we're doing that for file upload because handling form data seems to be difficult
function checkApiAuthOrElectron(req: Request, res: Response, next: NextFunction) {
    if (!req.session.loggedIn && !isElectron && !noAuthentication) {
        reject(req, res, "Logged in session not found");
    } else {
        next();
    }
}

function checkApiAuth(req: Request, res: Response, next: NextFunction) {
    if (!req.session.loggedIn && !noAuthentication) {
        reject(req, res, "Logged in session not found");
    } else {
        next();
    }
}

function checkAppInitialized(req: Request, res: Response, next: NextFunction) {
    if (!sqlInit.isDbInitialized()) {
        res.redirect("setup");
    } else {
        next();
    }
}

function checkPasswordSet(req: Request, res: Response, next: NextFunction) {
    if (!isElectron && !passwordService.isPasswordSet()) {
        res.redirect("set-password");
    } else {
        next();
    }
}

function checkPasswordNotSet(req: Request, res: Response, next: NextFunction) {
    if (!isElectron && passwordService.isPasswordSet()) {
        res.redirect("login");
    } else {
        next();
    }
}

function checkAppNotInitialized(req: Request, res: Response, next: NextFunction) {
    if (sqlInit.isDbInitialized()) {
        reject(req, res, "App already initialized.");
    } else {
        next();
    }
}

function checkEtapiToken(req: Request, res: Response, next: NextFunction) {
    if (etapiTokenService.isValidAuthHeader(req.headers.authorization)) {
        next();
    } else {
        reject(req, res, "Token not found");
    }
}

function reject(req: Request, res: Response, message: string) {
    log.info(`${req.method} ${req.path} rejected with 401 ${message}`);

    res.setHeader("Content-Type", "text/plain").status(401).send(message);
}

function checkCredentials(req: Request, res: Response, next: NextFunction) {
    if (!sqlInit.isDbInitialized()) {
        res.setHeader("Content-Type", "text/plain").status(400).send("Database is not initialized yet.");
        return;
    }

    if (!passwordService.isPasswordSet()) {
        res.setHeader("Content-Type", "text/plain").status(400).send("Password has not been set yet. Please set a password and repeat the action");
        return;
    }

    const header = req.headers["trilium-cred"] || "";
    if (typeof header !== "string") {
        res.setHeader("Content-Type", "text/plain").status(400).send("Invalid data type for trilium-cred.");
        return;
    }

    const auth = Buffer.from(header, "base64").toString();
    const colonIndex = auth.indexOf(":");
    const password = colonIndex === -1 ? "" : auth.substr(colonIndex + 1);
    // username is ignored

    if (!passwordEncryptionService.verifyPassword(password)) {
        res.setHeader("Content-Type", "text/plain").status(401).send("Incorrect password");
    } else {
        next();
    }
}

export default {
    checkAuth,
    checkApiAuth,
    checkAppInitialized,
    checkPasswordSet,
    checkPasswordNotSet,
    checkAppNotInitialized,
    checkApiAuthOrElectron,
    checkEtapiToken,
    checkCredentials
};