1 files changed, 96 insertions, 0 deletions
diff --git a/src/SMAPI.Web/Framework/Clients/ModDrop/ModDropClient.cs b/src/SMAPI.Web/Framework/Clients/ModDrop/ModDropClient.cs
new file mode 100644
index 00000000..19b0b24d
--- /dev/null
+++ b/src/SMAPI.Web/Framework/Clients/ModDrop/ModDropClient.cs
@@ -0,0 +1,96 @@
+using System.Threading.Tasks;
+using Pathoschild.Http.Client;
+using StardewModdingAPI.Toolkit;
+using StardewModdingAPI.Web.Framework.Clients.ModDrop.ResponseModels;
+
+namespace StardewModdingAPI.Web.Framework.Clients.ModDrop
+{
+    /// <summary>An HTTP client for fetching mod metadata from the ModDrop API.</summary>
+    internal class ModDropClient : IModDropClient
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The underlying HTTP client.</summary>
+        private readonly IClient Client;
+
+        /// <summary>The URL for a ModDrop mod page for the user, where {0} is the mod ID.</summary>
+        private readonly string ModUrlFormat;
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="userAgent">The user agent for the API client.</param>
+        /// <param name="apiUrl">The base URL for the ModDrop API.</param>
+        /// <param name="modUrlFormat">The URL for a ModDrop mod page for the user, where {0} is the mod ID.</param>
+        public ModDropClient(string userAgent, string apiUrl, string modUrlFormat)
+        {
+            this.Client = new FluentClient(apiUrl).SetUserAgent(userAgent);
+            this.ModUrlFormat = modUrlFormat;
+        }
+
+        /// <summary>Get metadata about a mod.</summary>
+        /// <param name="id">The ModDrop mod ID.</param>
+        /// <returns>Returns the mod info if found, else <c>null</c>.</returns>
+        public async Task<ModDropMod> GetModAsync(long id)
+        {
+            // get raw data
+            ModListModel response = await this.Client
+                .PostAsync("")
+                .WithBody(new
+                {
+                    ModIDs = new[] { id },
+                    Files = true,
+                    Mods = true
+                })
+                .As<ModListModel>();
+            ModModel mod = response.Mods[id];
+            if (mod.Mod?.Title == null || mod.Mod.ErrorCode.HasValue)
+                return null;
+
+            // get latest versions
+            ISemanticVersion latest = null;
+            ISemanticVersion optional = null;
+            foreach (FileDataModel file in mod.Files)
+            {
+                if (file.IsOld || file.IsDeleted || file.IsHidden)
+                    continue;
+
+                if (!SemanticVersion.TryParse(file.Version, out ISemanticVersion version))
+                    continue;
+
+                if (file.IsDefault)
+                {
+                    if (latest == null || version.IsNewerThan(latest))
+                        latest = version;
+                }
+                else if (optional == null || version.IsNewerThan(optional))
+                    optional = version;
+            }
+            if (latest == null)
+            {
+                latest = optional;
+                optional = null;
+            }
+            if (optional != null && latest.IsNewerThan(optional))
+                optional = null;
+
+            // generate result
+            return new ModDropMod
+            {
+                Name = mod.Mod?.Title,
+                LatestDefaultVersion = latest,
+                LatestOptionalVersion = optional,
+                Url = string.Format(this.ModUrlFormat, id)
+            };
+        }
+
+        /// <summary>Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.</summary>
+        public void Dispose()
+        {
+            this.Client?.Dispose();
+        }
+    }
+}