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/config.js

@@ -12,6 +12,31 @@ Object.values(servicesConfigJson.config).forEach(service => {
     )
 })
 
+const
+    apiURL = process.env.API_URL || '',
+
+    // WEB mode related environment variables
+    webEnvs = {
+        webPort: process.env.WEB_PORT || 9001,
+        webURL: process.env.WEB_URL || '',
+        showSponsors: !!process.env.SHOW_SPONSORS,
+        isBeta: !!process.env.IS_BETA,
+        plausibleHostname: process.env.PLAUSIBLE_HOSTNAME,
+        apiURL
+    },
+
+    // API mode related environment variables
+    apiEnvs = {
+        apiPort: process.env.API_PORT || 9000,
+        apiName: process.env.API_NAME || 'unknown',
+        corsWildcard: process.env.CORS_WILDCARD !== '0',
+        corsURL: process.env.CORS_URL,
+        cookiePath: process.env.COOKIE_PATH,
+        processingPriority: process.env.PROCESSING_PRIORITY && parseInt(process.env.PROCESSING_PRIORITY),
+        tiktokDeviceInfo: process.env.TIKTOK_DEVICE_INFO && JSON.parse(process.env.TIKTOK_DEVICE_INFO),
+        apiURL
+    }
+
 export const
     services = servicesConfigJson.config,
     audioIgnore = servicesConfigJson.audioIgnore,
@@ -26,4 +51,7 @@ export const
     supportedAudio = config.supportedAudio,
     celebrations = config.celebrations,
     links = config.links,
-    sponsors = config.sponsors
+    sponsors = config.sponsors,
+    mode = (apiURL && !webEnvs.webURL) ? 'API' :
+        (webEnvs.webURL && apiURL) ? 'WEB' : undefined,
+    env = mode === 'API' ? apiEnvs : webEnvs