Update reading secrets from config file

module.nix

@@ -23,8 +23,8 @@ in {
         timezone = "Europe/Warsaw";
 
         tauron = {
-          usernamePath = "/run/tauron.username.key";
-          passwordPath = "/run/tauron.password.key";
+          username = "$_file:/run/tauron.username.key";
+          password = "$_file:/run/tauron.password.key";
           point = "123456";
         };
 
@@ -32,7 +32,7 @@ in {
           influxdb = {
             enable = true;
             databaseURL = "https://influxdb.lan";
-            apiToken = "/run/mqtt/influxdb.token.key";
+            apiToken = "$__file:/run/mqtt/influxdb.token.key";
             organization = "home";
             bucket = "tauron";
           };
@@ -40,8 +40,8 @@ in {
           mqtt = {
             enable = true;
             brokerURL = "https://mqtt.lan";
-            usernamePath = "/run/mqtt.username.key";
-            passwordPath = "/run/mqtt.password.key";
+            username = "$__file:/run/mqtt.username.key";
+            password = "$__file:/run/mqtt.password.key";
             clientId = "tauron-scrapper";
             prefix = "tauron";
             publishOptions = {

src/consumers/influxdb.ts

@@ -3,6 +3,7 @@ import { InfluxDB, Point } from "@influxdata/influxdb-client";
 import { InfluxDBConfig, Measurement } from "@types";
 import { Consumer } from "./abstract";
 import { Dayjs } from "dayjs";
+import { enhancedStringConfig } from "../utils";
 
 export class InfluxDBConsumer extends Consumer<InfluxDBConfig> {
   public name = 'influxdb';
@@ -17,7 +18,7 @@ export class InfluxDBConsumer extends Consumer<InfluxDBConfig> {
   protected async publish({ databaseURL, apiToken, organization, bucket }: InfluxDBConfig, date: Dayjs, measurement: Measurement) {
     const db = new InfluxDB({ 
       url: databaseURL,
-      token: readFileSync(apiToken, 'utf8'),
+      token: enhancedStringConfig(apiToken),
     });
 
     const api = db.getWriteApi(organization, bucket);

src/consumers/mqtt.ts

@@ -4,17 +4,18 @@ import { Measurement } from "@types";
 import { Dayjs } from 'dayjs';
 import { MQTTConfig } from '../types/mqtt';
 import { Consumer } from './abstract';
+import { enhancedStringConfig } from '../utils';
 
 export * from '../types/mqtt';
 
 export class MQTTConsumer extends Consumer<MQTTConfig> {  
   public name = "mqtt";
-  protected requiredFields = ['brokerURL', 'usernamePath', 'passwordPath'] as const;
+  protected requiredFields = ['brokerURL', 'username', 'password'] as const;
 
-  protected publish({ brokerURL, usernamePath, passwordPath, clientId, prefix, publishOptions }: MQTTConfig, date: Dayjs, measurement: Measurement) {    
+  protected publish({ brokerURL, username, password, clientId, prefix, publishOptions }: MQTTConfig, date: Dayjs, measurement: Measurement) {    
     const client = mqtt.connect(brokerURL, {
-      username: fs.readFileSync(usernamePath, 'utf8'),
-      password: fs.readFileSync(passwordPath, 'utf8'),
+      username: enhancedStringConfig(username),
+      password: enhancedStringConfig(password),
       clientId: clientId || "tauron-scrapper"
     });
 

src/tauron/index.ts

@@ -4,6 +4,7 @@ import { EnergyDTO, EnergyRequestDTO, Payload, PowerDTO, PowerRequestDTO, Readin
 import { TauronConfig } from '../config';
 import { Dayjs } from 'dayjs';
 import { withCookies } from './cookie';
+import { enhancedStringConfig } from '../utils';
 
 export * from '../types/tauron';
 
@@ -55,8 +56,8 @@ export class Tauron {
     await this.#http.get(LOGIN_API);
     
     await this.#http.postForm(LOGIN_API, {
-      username: fs.readFileSync(this.#config.usernamePath, 'utf8'),
-      password: fs.readFileSync(this.#config.passwordPath, 'utf8'),
+      username: enhancedStringConfig(this.#config.username),
+      password: enhancedStringConfig(this.#config.password),
       service: BASE_URL
     });
 

src/types/mqtt.ts

@@ -11,12 +11,12 @@ export type MQTTConfig = {
   /**
    * Path to file containing a username of MQTT user.
    */
-  usernamePath: string;
+  username: string;
 
   /**
    * Path to file containing a password of MQTT user.
    */
-  passwordPath: string;
+  password: string;
 
   /**
    * Optional client ID used to connect to MQTT (visible in MQTT broker logs).

src/types/tauron.ts

@@ -2,12 +2,12 @@ export type TauronConfig = {
   /**
    * Path to file containing a username of Tauron account
    */
-  usernamePath: string;
+  username: string;
 
   /**
    * Path to file containing a password of Tauron account
    */
-  passwordPath: string;
+  password: string;
 
   /**
    * The measure point name - should be retrieved with browser dev-tools on website

src/utils/index.ts

@@ -1,3 +1,5 @@
+import { readFileSync } from "fs";
+
 export const sleep = (ms: number) => new Promise(resolve => setTimeout(resolve, ms));
 
 export const gaussianRandom = (mean = 0, stddev = 1) => {
@@ -5,4 +7,20 @@ export const gaussianRandom = (mean = 0, stddev = 1) => {
   let u2 = Math.random();
   let z0 = Math.sqrt(-2.0 * Math.log(u1)) * Math.cos(2.0 * Math.PI * u2);
   return z0 * stddev + mean;
-}
+}
+
+const specialOptions: Record<string, (text: string) => string> = {
+  $__file: (arg: string) => readFileSync(arg, 'utf8').trim()
+};
+
+export const enhancedStringConfig = (value: string) => {  
+  const trimmed = value.trim();
+
+  for(const opt of Object.keys(specialOptions)) {
+    if(trimmed.startsWith(`${opt}:`) && opt in specialOptions) {      
+      return specialOptions[opt](trimmed.slice(opt.length + 1).trim());
+    }
+  }
+
+  return trimmed;
+};