From 945f3e474f9f1baeb60494eb3d6e602a7d55dd78 Mon Sep 17 00:00:00 2001
From: jgstroud <jon@strouds.org>
Date: Sun, 27 Oct 2024 22:08:22 -0500
Subject: [PATCH] Add a function to auto lookup our timezone using our public
 ip

autoset the time based on local timezone
---
 src/ratgdo.cpp    |  5 +++++
 src/utilities.cpp | 51 +++++++++++++++++++++++++++++++++++++++++++----
 src/utilities.h   |  1 +
 3 files changed, 53 insertions(+), 4 deletions(-)

diff --git a/src/ratgdo.cpp b/src/ratgdo.cpp
index a319001..41a8954 100644
--- a/src/ratgdo.cpp
+++ b/src/ratgdo.cpp
@@ -249,6 +249,7 @@ void obstruction_timer()
 
 void service_timer_loop()
 {
+    static unsigned long tz_update = 10000;
     loop_id = LOOP_TIMER;
     // Service the Obstruction Timer
     obstruction_timer();
@@ -256,6 +257,10 @@ void service_timer_loop()
     unsigned long current_millis = millis();
 
 #ifdef NTP_CLIENT
+    if (enableNTP && !clockSet && (current_millis > tz_update)) {
+        tz_update = current_millis + 10000;
+        update_timezone();
+    }
     if (enableNTP && clockSet && lastRebootAt == 0)
     {
         lastRebootAt = time(NULL) - (current_millis / 1000);
diff --git a/src/utilities.cpp b/src/utilities.cpp
index 5245dc8..9c80379 100644
--- a/src/utilities.cpp
+++ b/src/utilities.cpp
@@ -6,6 +6,7 @@
 #include "LittleFS.h"
 #include "comms.h"
 #include <ESP8266WiFi.h>
+#include <ESP8266HTTPClient.h>
 
 #ifdef LEGACY_SETTINGS_MIGRATION
 // Filenames for legacy user configuation, replaced by single file.
@@ -51,6 +52,51 @@ bool enableNTP = false;
 unsigned long lastRebootAt = 0;
 int32_t savedDoorUpdateAt = 0;
 
+bool get_tz()
+{
+    WiFiClient client;
+    HTTPClient http;
+    bool success = false;
+
+    if (http.begin(client, "http://ip-api.com/csv/?fields=timezone,offset"))
+    { // HTTP
+
+        // start connection and send HTTP header
+        int httpCode = http.GET();
+
+        // httpCode will be negative on error
+        if (httpCode > 0)
+        {
+            if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY)
+            {
+                String payload = http.getString();
+                char * timezone = (char*)payload.c_str();
+                char * ch = strchr(timezone, ',');
+                *ch = '\0';
+                ch++;
+                int offset = atoi(ch);
+                offset /= -3600;
+                sprintf(userConfig->timeZone, "%s;UTC%d", timezone, offset);
+                RINFO("Setting timezone to %s", userConfig->timeZone);
+                success = true;
+            }
+        }
+        http.end();
+    } else {
+        success = false;
+    }
+    return success;
+}
+
+void update_timezone()
+{
+    if (get_tz()) {
+        char *tz = strchr(userConfig->timeZone, ';');
+        // semicolon may separate continent/city from posix TZ string
+        configTime((tz) ? tz + 1 : userConfig->timeZone, NTP_SERVER);
+    }
+}
+
 void time_is_set(bool from_sntp)
 {
     RINFO("Clock set from NTP server: %d", from_sntp ? 1 : 0);
@@ -93,7 +139,7 @@ char *timeString(time_t reqTime, bool syslog)
         else
         {
             // Print format example: 27-Oct-2024 11:16:18 EDT
-            strftime(tBuffer, sizeof(tBuffer), "%d-%b-%Y %H:%M:%S %Z", &tmTime);
+            strftime(tBuffer, sizeof(tBuffer), "%d-%b-%Y %H:%M:%S", &tmTime);
         }
     }
     return tBuffer;
@@ -239,9 +285,6 @@ void load_all_config_settings()
     if (enableNTP)
     {
         settimeofday_cb(time_is_set);
-        char *tz = strchr(userConfig->timeZone, ';');
-        // semicolon may separate continent/city from posix TZ string
-        configTime((tz) ? tz + 1 : userConfig->timeZone, NTP_SERVER);
     }
 #endif
     syslogEn = userConfig->syslogEn;
diff --git a/src/utilities.h b/src/utilities.h
index 84f510b..b63a2ad 100644
--- a/src/utilities.h
+++ b/src/utilities.h
@@ -117,5 +117,6 @@ bool read_config_from_file();
 void write_config_to_file();
 
 void delete_file(const char *filename);
+void update_timezone();
 
 #endif