WIP

PlanTempus.Core/Configurations/JsonConfigProvider/JsonConfigExtension.cs

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+using PlanTempus.Core.Exceptions;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using PlanTempus.Core.Configurations;
+
+namespace PlanTempus.Core.Configurations.JsonConfigProvider
+{
+    public static class JsonConfigExtension
+    {
+        /// <summary>
+        /// Adds a JSON configuration source to the configuration builder.
+        /// </summary>
+        /// <param name="builder">The configuration builder to add to</param>
+        /// <param name="configurationFilePath">Path to the JSON configuration file. Defaults to "appconfiguration.json"</param>
+        /// <param name="optional">If true, the configuration file is optional. Defaults to true</param>
+        /// <param name="reloadOnChange">If true, the configuration will be reloaded when the file changes. Defaults to false</param>
+        /// <returns>The configuration builder</returns>
+        public static IConfigurationBuilder AddJsonFile(this IConfigurationBuilder builder, string configurationFilePath = "appconfiguration.json", bool? optional = true, bool? reloadOnChange = false)
+        {
+            return builder.AddProvider(new JsonConfigProvider(builder, configurationFilePath, optional ?? true, reloadOnChange ?? false));
+        }
+    }
+
+    public interface IHasConfigurationFilePath
+    {
+        string ConfigurationFilePath { get; }
+    }
+    public class JsonConfigProvider : IConfigurationProvider, IHasConfigurationFilePath
+    {
+        private readonly IConfigurationBuilder _builder;
+        private readonly bool _reloadOnChange;
+        JObject _configuration;
+        public string ConfigurationFilePath { get; private set; }
+
+        public JsonConfigProvider() { }
+
+        public JsonConfigProvider(IConfigurationBuilder builder, string configurationFilePath, bool optional, bool reloadOnChange)
+        {
+            if (!optional && !File.Exists(configurationFilePath))
+                throw new ConfigurationException($"File not found, path: {configurationFilePath}");
+            if (optional && !File.Exists(configurationFilePath))
+                return;
+
+            ConfigurationFilePath = configurationFilePath;
+            _builder = builder;
+            _reloadOnChange = reloadOnChange;
+        }
+
+        public void Build()
+        {
+            using (StreamReader file = File.OpenText(ConfigurationFilePath))
+            using (JsonTextReader reader = new JsonTextReader(file))
+            {
+                _configuration = (JObject)JToken.ReadFrom(reader);
+            }
+        }
+
+        public JObject Configuration()
+        {
+            return _configuration;
+        }
+    }
+}