1 files changed, 89 insertions, 0 deletions
diff --git a/src/SMAPI.Web/Framework/ModRepositories/NexusRepository.cs b/src/SMAPI.Web/Framework/ModRepositories/NexusRepository.cs
new file mode 100644
index 00000000..8a4bb0d8
--- /dev/null
+++ b/src/SMAPI.Web/Framework/ModRepositories/NexusRepository.cs
@@ -0,0 +1,89 @@
+using System;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+using Pathoschild.Http.Client;
+using StardewModdingAPI.Common.Models;
+
+namespace StardewModdingAPI.Web.Framework.ModRepositories
+{
+    /// <summary>An HTTP client for fetching mod metadata from Nexus Mods.</summary>
+    internal class NexusRepository : RepositoryBase
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The URL for a Nexus Mods API query excluding the base URL, where {0} is the mod ID.</summary>
+        private readonly string ModUrlFormat;
+
+        /// <summary>The underlying HTTP client.</summary>
+        private readonly IClient Client;
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="vendorKey">The unique key for this vendor.</param>
+        /// <param name="userAgent">The user agent for the Nexus Mods API client.</param>
+        /// <param name="baseUrl">The base URL for the Nexus Mods API.</param>
+        /// <param name="modUrlFormat">The URL for a Nexus Mods API query excluding the <paramref name="baseUrl"/>, where {0} is the mod ID.</param>
+        public NexusRepository(string vendorKey, string userAgent, string baseUrl, string modUrlFormat)
+            : base(vendorKey)
+        {
+            this.ModUrlFormat = modUrlFormat;
+            this.Client = new FluentClient(baseUrl).SetUserAgent(userAgent);
+        }
+
+        /// <summary>Get metadata about a mod in the repository.</summary>
+        /// <param name="id">The mod ID in this repository.</param>
+        public override async Task<ModInfoModel> GetModInfoAsync(string id)
+        {
+            // validate ID format
+            if (!uint.TryParse(id, out uint _))
+                return new ModInfoModel($"The value '{id}' isn't a valid Nexus mod ID, must be an integer ID.");
+
+            // fetch info
+            try
+            {
+                NexusResponseModel response = await this.Client
+                    .GetAsync(string.Format(this.ModUrlFormat, id))
+                    .As<NexusResponseModel>();
+
+                return response != null
+                    ? new ModInfoModel(response.Name, this.NormaliseVersion(response.Version), response.Url)
+                    : new ModInfoModel("Found no mod with this ID.");
+            }
+            catch (Exception ex)
+            {
+                return new ModInfoModel(ex.ToString());
+            }
+        }
+
+        /// <summary>Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.</summary>
+        public override void Dispose()
+        {
+            this.Client.Dispose();
+        }
+
+
+        /*********
+        ** Private models
+        *********/
+        /// <summary>A mod metadata response from Nexus Mods.</summary>
+        private class NexusResponseModel
+        {
+            /*********
+            ** Accessors
+            *********/
+            /// <summary>The mod name.</summary>
+            public string Name { get; set; }
+
+            /// <summary>The mod's semantic version number.</summary>
+            public string Version { get; set; }
+
+            /// <summary>The mod's web URL.</summary>
+            [JsonProperty("mod_page_uri")]
+            public string Url { get; set; }
+        }
+    }
+}