From 05f8ef95d944eff155b068c30e26d5556c1b1402 Mon Sep 17 00:00:00 2001
From: ngosang <ngosang@hotmail.es>
Date: Sun, 30 May 2021 11:28:43 +0200
Subject: [PATCH] Configure timezone with TZ env var. Resolves #109

---
 README.md          |  3 ++-
 docker-compose.yml |  1 +
 src/log.ts         | 21 ++++++++++++++++++++-
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index a821183..4756b81 100644
--- a/README.md
+++ b/README.md
@@ -226,7 +226,8 @@ Name | Default | Notes
 |--|--|--|
 LOG_LEVEL | info | Verbosity of the logging. Use `LOG_LEVEL=debug` for more information.
 LOG_HTML | false | Only for debugging. If `true` all HTML that passes through the proxy will be logged to the console in `debug` level.
-CAPTCHA_SOLVER | none | Captcha solving method. It used when a captcha is encountered. See the Captcha Solvers section.
+CAPTCHA_SOLVER | none | Captcha solving method. It is used when a captcha is encountered. See the Captcha Solvers section.
+TZ | UTC | Timezone used in the logs and the web browser. Example: `TZ=Europe/London`.
 HEADLESS | true | Only for debugging. To run the web browser in headless mode or visible.
 PORT | 8191 | Listening port. You don't need to change this if you are running on Docker.
 HOST | 0.0.0.0 | Listening interface. You don't need to change this if you are running on Docker.
diff --git a/docker-compose.yml b/docker-compose.yml
index 3c33784..be0c4af 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -9,6 +9,7 @@ services:
       - LOG_LEVEL=${LOG_LEVEL:-info}
       - LOG_HTML=${LOG_HTML:-false}
       - CAPTCHA_SOLVER=${CAPTCHA_SOLVER:-none}
+      - TZ=Europe/London
     ports:
       - "${PORT:-8191}:8191"
     restart: unless-stopped
diff --git a/src/log.ts b/src/log.ts
index 443adad..3b2e11d 100644
--- a/src/log.ts
+++ b/src/log.ts
@@ -2,6 +2,25 @@ let requests = 0
 
 const LOG_HTML: boolean = process.env.LOG_HTML == 'true';
 
+function toIsoString(date: Date) {
+  // this function fixes Date.toISOString() adding timezone
+  let tzo = -date.getTimezoneOffset(),
+      dif = tzo >= 0 ? '+' : '-',
+      pad = function(num: number) {
+        let norm = Math.floor(Math.abs(num));
+        return (norm < 10 ? '0' : '') + norm;
+      };
+
+  return date.getFullYear() +
+      '-' + pad(date.getMonth() + 1) +
+      '-' + pad(date.getDate()) +
+      'T' + pad(date.getHours()) +
+      ':' + pad(date.getMinutes()) +
+      ':' + pad(date.getSeconds()) +
+      dif + pad(tzo / 60) +
+      ':' + pad(tzo % 60);
+}
+
 export default {
   incRequests: () => { requests++ },
   html(html: string) {
@@ -12,7 +31,7 @@ export default {
     {level: process.env.LOG_LEVEL || 'info',
       prefix(level: string) {
         const req = (requests > 0) ? ` REQ-${requests}` : '';
-        return `${new Date().toISOString()} ${level.toUpperCase()}${req}`
+        return `${toIsoString(new Date())} ${level.toUpperCase()}${req}`
       }
     }
   )