1 files changed, 70 insertions, 0 deletions
diff --git a/src/StardewModdingAPI/Framework/WebApiClient.cs b/src/StardewModdingAPI/Framework/WebApiClient.cs
new file mode 100644
index 00000000..0ee57648
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+++ b/src/StardewModdingAPI/Framework/WebApiClient.cs
@@ -0,0 +1,70 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Net;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+using StardewModdingAPI.Models;
+
+namespace StardewModdingAPI.Framework
+{
+    /// <summary>Provides methods for interacting with the SMAPI web API.</summary>
+    internal class WebApiClient
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The base URL for the web API.</summary>
+        private readonly Uri BaseUrl;
+
+        /// <summary>The API version number.</summary>
+        private readonly ISemanticVersion Version;
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="baseUrl">The base URL for the web API.</param>
+        /// <param name="version">The web API version.</param>
+        public WebApiClient(string baseUrl, ISemanticVersion version)
+        {
+#if !SMAPI_FOR_WINDOWS
+            baseUrl = baseUrl.Replace("https://", "http://"); // workaround for OpenSSL issues with the game's bundled Mono on Linux/Mac
+#endif
+            this.BaseUrl = new Uri(baseUrl);
+            this.Version = version;
+        }
+
+        /// <summary>Get the latest SMAPI version.</summary>
+        /// <param name="modKeys">The mod keys for which to fetch the latest version.</param>
+        public async Task<IDictionary<string, ModInfoModel>> GetModInfoAsync(params string[] modKeys)
+        {
+            string url = $"v{this.Version}/mods?modKeys={Uri.EscapeDataString(string.Join(",", modKeys))}";
+            return await this.GetAsync<Dictionary<string, ModInfoModel>>(url);
+        }
+
+
+        /*********
+        ** Private methods
+        *********/
+        /// <summary>Fetch the response from the backend API.</summary>
+        /// <typeparam name="T">The expected response type.</typeparam>
+        /// <param name="url">The request URL, optionally excluding the base URL.</param>
+        private async Task<T> GetAsync<T>(string url)
+        {
+            // build request (avoid HttpClient for Mac compatibility)
+            HttpWebRequest request = WebRequest.CreateHttp(new Uri(this.BaseUrl, url).ToString());
+            request.UserAgent = $"SMAPI/{this.Version}";
+
+            // fetch data
+            using (WebResponse response = await request.GetResponseAsync())
+            using (Stream responseStream = response.GetResponseStream())
+            using (StreamReader reader = new StreamReader(responseStream))
+            {
+                string responseText = reader.ReadToEnd();
+                return JsonConvert.DeserializeObject<T>(responseText);
+            }
+        }
+    }
+}