Move ip update to hosted service

2025-08-04 14:26:45 -06:00
parent ae95b15ee6
commit a603b4287e
3 changed files with 154 additions and 156 deletions
@@ -0,0 +1,105 @@
+namespace JoshHeaps.Net.Services.Implementations;
+
+public class AutoIpUpdateService(
+        IConfiguration config,
+        ILogger<AutoIpUpdateService> log)
+    : BackgroundService
+{
+    private static readonly TimeSpan CheckInterval = TimeSpan.FromMinutes(5);
+    private static readonly HttpClient httpClient = new();
+    public static bool IsEnabled { get; private set; } = false;
+
+    protected override async Task ExecuteAsync(CancellationToken stop)
+    {
+        IsEnabled = true;
+        var timer = new PeriodicTimer(CheckInterval);
+        AAAARecord dnsRecord = await GetDnsRecordAsync();
+        string lastKnownIp = dnsRecord.Content;
+
+        while (await timer.WaitForNextTickAsync(stop))
+        {
+            try
+            {
+                string currentIp = await GetPublicIpAsync() ?? "";
+
+                if (lastKnownIp != currentIp)
+                {
+                    await UpdateDnsIpAsync(config, dnsRecord, currentIp);
+
+                    lastKnownIp = currentIp;
+                }
+            }
+            catch (OperationCanceledException) { /* shutting down */ }
+            catch (Exception ex)
+            {
+                log.LogError(ex, "Error while attempting ip update");
+            }
+        }
+    }
+
+    private static async Task<string> GetPublicIpAsync()
+    {
+        try
+        {
+            return await httpClient.GetStringAsync(@"https://api.ipify.org/");
+        }
+        catch
+        {
+            await Task.Delay(TimeSpan.FromSeconds(10));
+            Console.WriteLine("Reattempting to grab public ip");
+
+            return await GetPublicIpAsync();
+        }
+    }
+
+    private async Task<AAAARecord> GetDnsRecordAsync()
+    {
+        try
+        {
+            HttpClient cfClient = new();
+            cfClient.DefaultRequestHeaders.Add("X-Auth-Email", config["cfEmail"]);
+            cfClient.DefaultRequestHeaders.Add("X-Auth-Key", config["cfKey"]);
+            var result = await cfClient.GetAsync(@$"https://api.cloudflare.com/client/v4/zones/{config["zoneId"]}/dns_records");
+            Console.WriteLine(await result.Content.ReadAsStringAsync());
+            var records = System.Text.Json.JsonSerializer.Deserialize<RecordList>(await result.Content.ReadAsStringAsync());
+            return records!.Result[0];
+        }
+        catch
+        {
+            await Task.Delay(TimeSpan.FromSeconds(10));
+            Console.WriteLine("Reattempting to grab current ip");
+
+            return await GetDnsRecordAsync();
+        }
+    }
+
+    private static async Task UpdateDnsIpAsync(IConfiguration config, AAAARecord record, string ip)
+    {
+        HttpClient cfClient = new();
+        cfClient.DefaultRequestHeaders.Add("X-Auth-Email", config["cfEmail"]);
+        cfClient.DefaultRequestHeaders.Add("X-Auth-Key", config["cfKey"]);
+        object content = new
+        {
+            comment = "Update as needed",
+            content = ip,
+            name = "@",
+            proxied = true,
+            ttl = 3600,
+            type = "AAAA"
+        };
+
+        var result = await cfClient.PutAsJsonAsync(@$"https://api.cloudflare.com/client/v4/zones/{config["zoneId"]}/dns_records{record.Id}", content);
+
+        if (!result.IsSuccessStatusCode)
+        {
+            await Task.Delay(TimeSpan.FromSeconds(10));
+            Console.WriteLine("Reattempting to update ip");
+
+            await UpdateDnsIpAsync(config, record, ip);
+        }
+    }
+
+    record AAAARecord(string Comment, string Content, string Name, string Id);
+
+    record RecordList(List<AAAARecord> Result);
+}