Validate options on start

Author: LouisMT

src/Core/Handlers/UpdateHandler.cs

@@ -9,12 +9,12 @@ public static class UpdateHandler
 {
     public static async Task<IResult> Handle(
         CloudflareClient cloudflareClient,
-        IOptions<List<RecordOptions>> recordOptions,
+        IOptions<DdnsOptions> ddnsOptions,
         [FromQuery] string key,
         [FromQuery] string ipv4
     )
     {
-        var record = recordOptions.Value.Single(r => r.Key == key);
+        var record = ddnsOptions.Value.Records.Single(r => r.Key == key);
 
         await cloudflareClient.UpdateDnsRecord(record.ZoneId, record.DnsRecordId, ipv4);
 

src/Core/Options/CloudflareOptions.cs

@@ -1,8 +1,11 @@
+using System.ComponentModel.DataAnnotations;
+
 namespace Core.Options;
 
 public record CloudflareOptions
 {
     public const string Cloudflare = "Cloudflare";
 
-    public required string ApiToken { get; set; }
+    [Required]
+    public string ApiToken { get; set; } = null!;
 }

src/Core/Options/DdnsOptions.cs

@@ -0,0 +1,13 @@
+using System.ComponentModel.DataAnnotations;
+using Microsoft.Extensions.Options;
+
+namespace Core.Options;
+
+public record DdnsOptions
+{
+    public const string Ddns = "DDNS";
+
+    [Required]
+    [ValidateEnumeratedItems]
+    public IList<DdnsRecord> Records { get; set; } = null!;
+}

src/Core/Options/RecordOptions.cs src/Core/Options/DdnsRecord.cssrc/Core/Options/RecordOptions.cs renamed to src/Core/Options/DdnsRecord.cs

@@ -1,12 +1,15 @@
+using System.ComponentModel.DataAnnotations;
+
 namespace Core.Options;
 
-public record RecordOptions
+public record DdnsRecord
 {
-    public const string Records = "Records";
-
+    [Required]
     public string Key { get; set; } = null!;
 
+    [Required]
     public string ZoneId { get; set; } = null!;
 
+    [Required]
     public string DnsRecordId { get; set; } = null!;
 }

src/Core/OptionsValidators/CloudflareOptionsValidator.cs

@@ -0,0 +1,9 @@
+using Core.Options;
+using Microsoft.Extensions.Options;
+
+namespace Core.OptionsValidators;
+
+[OptionsValidator]
+public partial class CloudflareOptionsValidator : IValidateOptions<CloudflareOptions>
+{
+}

src/Core/OptionsValidators/DdnsOptionsValidator.cs

@@ -0,0 +1,9 @@
+using Core.Options;
+using Microsoft.Extensions.Options;
+
+namespace Core.OptionsValidators;
+
+[OptionsValidator]
+public partial class DdnsOptionsValidator : IValidateOptions<DdnsOptions>
+{
+}

src/Core/Program.cs

@@ -2,6 +2,8 @@
 using Core.Handlers;
 using Core.MessageHandlers;
 using Core.Options;
+using Core.OptionsValidators;
+using Microsoft.Extensions.Options;
 
 namespace Core;
 
@@ -11,11 +13,13 @@ public static void Main(string[] args)
     {
         var builder = WebApplication.CreateSlimBuilder(args);
 
-        builder.Services.AddOptions<CloudflareOptions>()
+        builder.Services.AddOptionsWithValidateOnStart<CloudflareOptions>()
             .Bind(builder.Configuration.GetSection(CloudflareOptions.Cloudflare));
+        builder.Services.AddSingleton<IValidateOptions<CloudflareOptions>, CloudflareOptionsValidator>();
 
-        builder.Services.AddOptions<List<RecordOptions>>()
-            .Bind(builder.Configuration.GetSection(RecordOptions.Records));
+        builder.Services.AddOptionsWithValidateOnStart<DdnsOptions>()
+            .Bind(builder.Configuration.GetSection(DdnsOptions.Ddns));
+        builder.Services.AddSingleton<IValidateOptions<DdnsOptions>, DdnsOptionsValidator>();
 
         builder.Services.AddTransient<CloudflareApiTokenMessageHandler>();
 

src/Core/appsettings.json

@@ -2,11 +2,13 @@
     "Cloudflare": {
         "ApiToken": ""
     },
-    "Records": [
-        {
-            "Key": "",
-            "ZoneId": "",
-            "DnsRecordId": ""
-        }
-    ]
+    "DDNS": {
+        "Records": [
+            {
+                "Key": "",
+                "ZoneId": "",
+                "DnsRecordId": ""
+            }
+        ]
+    }
 }