refactor: centralize envs and their defaults in modules/config (#464)

* feat(config): centralized env variables and their default values

* fix: fip `corsWildcard` variable check in `corsConfig`

* fix(config): use already declared variables and default some strings to undefined

* fix: check processingPriority against NaN

src/modules/processing/cookie/manager.js

@@ -1,9 +1,10 @@
 import Cookie from './cookie.js';
 import { readFile, writeFile } from 'fs/promises';
 import { parse as parseSetCookie, splitCookiesString } from 'set-cookie-parser';
+import { env } from '../../../modules/config.js'
 
 const WRITE_INTERVAL = 60000,
-      cookiePath = process.env.COOKIE_PATH,
+      cookiePath = env.cookiePath,
       COUNTER = Symbol('counter');
 
 let cookies = {}, dirty = false, intervalId;

src/modules/processing/services/tiktok.js

@@ -1,4 +1,4 @@
-import { genericUserAgent } from "../../config.js";
+import { genericUserAgent, env } from "../../config.js";
 
 const shortDomain = "https://vt.tiktok.com/";
 const apiPath = "https://api22-normal-c-alisg.tiktokv.com/aweme/v1/feed/?region=US&carrier_region=US";
@@ -7,7 +7,7 @@ const apiUserAgent = "TikTok/338014 CFNetwork/1410.1 Darwin/22.6.0";
 export default async function(obj) {
     let postId = obj.postId ? obj.postId : false;
 
-    if (!process.env.TIKTOK_DEVICE_INFO) return { error: 'ErrorCouldntFetch' };
+    if (!env.tiktokDeviceInfo) return { error: 'ErrorCouldntFetch' };
 
     if (!postId) {
         let html = await fetch(`${shortDomain}${obj.id}`, {
@@ -27,8 +27,7 @@ export default async function(obj) {
     }
     if (!postId) return { error: 'ErrorCantGetID' };
 
-    let deviceInfo = JSON.parse(process.env.TIKTOK_DEVICE_INFO);
-        deviceInfo = new URLSearchParams(deviceInfo).toString();
+    let deviceInfo = new URLSearchParams(env.tiktokDeviceInfo).toString();
 
     let apiURL = new URL(apiPath);
         apiURL.searchParams.append("aweme_id", postId);