import RateLimit from 'express-rate-limit';

import config from './config.mjs';

// Constants

const domain = process.env.DOMAIN || config.config.domain || "localhost";

const port = process.env.PORT || config.config.port || 8080;

const db_path = process.env.DB || config.config.db_path || "ucs.db";

const cors = (function() {
    let origins = new Set();
    for (const site in config.config.sites) {
        config.config.sites[site].cors.forEach(origin => {origins.add(origin) });
    }
    return Array.from(origins);
})();

// functions

function escapeHtml(unsafe) {
    return unsafe
        .replace(/&/g, "&")
        .replace(/</g, "&lt;")
        .replace(/>/g, "&gt;")
        .replace(/"/g, "&quot;")
        .replace(/'/g, "&#039;");
}

// limiters

const limiter = limit => RateLimit({
    windowMs: 1 * 60 * 1000,
    max: limit,
});


export default {
    domain,
    port,
    db_path,
    cors,
    escapeHtml,
    get_limiter: limiter(config.config.limits_per_second.get),
    post_limiter: limiter(config.config.limits_per_second.post),
};