refactor: better env handling (#5)

Reviewed-on: #5
Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-committed-by: Timo Behrendt <t.behrendt@t00n.de>

src/env.ts

@@ -0,0 +1,53 @@
+import { from } from "env-var";
+
+import type { LogLevel, Mode } from "./types";
+
+const envVar = from(process.env, {
+  asLogLevel: (value): LogLevel => {
+    const logLevels = ["error", "info", "debug"];
+    if (logLevels.includes(value)) {
+      return value as LogLevel;
+    } else {
+      throw new Error("Invalid log level");
+    }
+  },
+  asTs3GotifyMode: (value): Mode => {
+    const modes = ["connect", "disconnect", "moved", "message"];
+    if (modes.includes(value)) {
+      return value as Mode;
+    } else {
+      throw new Error("Invalid mode");
+    }
+  },
+});
+
+export const LOG_LEVEL = envVar.get("LOG_LEVEL").default("info").asLogLevel();
+
+export const TS3_HOST = envVar.get("TS3_HOST").required().asString();
+export const TS3_QUERY_PORT = envVar
+  .get("TS3_QUERY_PORT")
+  .default(10011)
+  .asPortNumber();
+export const TS3_SERVER_PORT = envVar
+  .get("TS3_SERVER_PORT")
+  .default(9987)
+  .asPortNumber();
+export const TS3_USERNAME = envVar.get("TS3_USERNAME").required().asString();
+export const TS3_PASSWORD = envVar.get("TS3_PASSWORD").required().asString();
+export const TS3_NICKNAME = envVar
+  .get("TS3_NICKNAME")
+  .default("ts3gotify")
+  .asString();
+
+export const GOTIFY_URL = envVar.get("GOTIFY_URL").required().asUrlString();
+export const GOTIFY_TOKEN = envVar.get("GOTIFY_TOKEN").required().asString();
+export const GOTIFY_TITLE = envVar
+  .get("GOTIFY_TITLE")
+  .default("ts3gotify")
+  .asString();
+
+export const MODE = envVar
+  .get("MODE")
+  .default("['connect']")
+  .asJsonArray()
+  .map((value) => value.asTs3GotifyMode());