feat: ip service for retrieving external ip from providers

src/CloudflareDnsync.Services/CloudflareDnsync.Services.csproj

@@ -5,6 +5,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.1" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
   </ItemGroup>
 

src/CloudflareDnsync.Services/IIPService.cs

@@ -0,0 +1,6 @@
+namespace CloudflareDnsync.Services;
+
+public interface IIPService
+{
+    Task<string> GetPublicIpAsync(CancellationToken cancellationToken = default);
+}

src/CloudflareDnsync.Services/IPService.cs

@@ -0,0 +1,32 @@
+using Microsoft.Extensions.Logging;
+
+namespace CloudflareDnsync.Services;
+
+public sealed class IPService(ILogger<IPService> logger) : IIPService
+{
+    private readonly Uri[] _providers = [
+        new Uri("https://api.ipify.org"),
+        new Uri("https://icanhazip.com"),
+        new Uri("https://ifconfig.me"),
+        new Uri("https://ident.me"),
+    ];
+
+    public async Task<string> GetPublicIpAsync(CancellationToken cancellationToken = default)
+    {
+        foreach (var provider in _providers)
+        {
+            try
+            {
+                using var client = new HttpClient();
+                var response = await client.GetAsync(provider, cancellationToken);
+                response.EnsureSuccessStatusCode();
+                return await response.Content.ReadAsStringAsync(cancellationToken);
+            }
+            catch (Exception ex)
+            {
+                logger.LogWarning(ex, "Failed to retrieve public IP from {Provider}", provider.Host);
+            }
+        }
+        throw new Exception("Failed to retrieve public IP from all providers");
+    }
+}