Merge branch 'feature/update-check-api' into develop

30 files changed, 968 insertions, 91 deletions

diff --git a/src/StardewModdingAPI.Models/ModInfoModel.cs b/src/StardewModdingAPI.Models/ModInfoModel.cs
new file mode 100644
index 00000000..44071230
--- /dev/null
+++ b/src/StardewModdingAPI.Models/ModInfoModel.cs
@@ -0,0 +1,48 @@
+using Newtonsoft.Json;
+
+namespace StardewModdingAPI.Models
+{
+    /// <summary>Generic metadata about a mod.</summary>
+    internal class ModInfoModel
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The mod name.</summary>
+        public string Name { get; }
+
+        /// <summary>The mod's semantic version number.</summary>
+        public string Version { get; }
+
+        /// <summary>The mod's web URL.</summary>
+        public string Url { get; }
+
+        /// <summary>The error message indicating why the mod is invalid (if applicable).</summary>
+        public string Error { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct a valid instance.</summary>
+        /// <param name="name">The mod name.</param>
+        /// <param name="version">The mod's semantic version number.</param>
+        /// <param name="url">The mod's web URL.</param>
+        /// <param name="error">The error message indicating why the mod is invalid (if applicable).</param>
+        [JsonConstructor]
+        public ModInfoModel(string name, string version, string url, string error = null)
+        {
+            this.Name = name;
+            this.Version = version;
+            this.Url = url;
+            this.Error = error; // mainly initialised here for the JSON deserialiser
+        }
+
+        /// <summary>Construct an valid instance.</summary>
+        /// <param name="error">The error message indicating why the mod is invalid.</param>
+        public ModInfoModel(string error)
+        {
+            this.Error = error;
+        }
+    }
+}
diff --git a/src/StardewModdingAPI.Models/StardewModdingAPI.Models.projitems b/src/StardewModdingAPI.Models/StardewModdingAPI.Models.projitems
new file mode 100644
index 00000000..2465760e
--- /dev/null
+++ b/src/StardewModdingAPI.Models/StardewModdingAPI.Models.projitems
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
+    <HasSharedItems>true</HasSharedItems>
+    <SharedGUID>2aa02fb6-ff03-41cf-a215-2ee60ab4f5dc</SharedGUID>
+  </PropertyGroup>
+  <PropertyGroup Label="Configuration">
+    <Import_RootNamespace>StardewModdingAPI.Models</Import_RootNamespace>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="$(MSBuildThisFileDirectory)ModInfoModel.cs" />
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/src/StardewModdingAPI.Models/StardewModdingAPI.Models.shproj b/src/StardewModdingAPI.Models/StardewModdingAPI.Models.shproj
new file mode 100644
index 00000000..c80517af
--- /dev/null
+++ b/src/StardewModdingAPI.Models/StardewModdingAPI.Models.shproj
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>2aa02fb6-ff03-41cf-a215-2ee60ab4f5dc</ProjectGuid>
+    <MinimumVisualStudioVersion>14.0</MinimumVisualStudioVersion>
+  </PropertyGroup>
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)\CodeSharing\Microsoft.CodeSharing.Common.Default.props" />
+  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)\CodeSharing\Microsoft.CodeSharing.Common.props" />
+  <PropertyGroup />
+  <Import Project="StardewModdingAPI.Models.projitems" Label="Shared" />
+  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)\CodeSharing\Microsoft.CodeSharing.CSharp.targets" />
+</Project>
diff --git a/src/StardewModdingAPI.Tests/StardewModdingAPI.Tests.csproj b/src/StardewModdingAPI.Tests/StardewModdingAPI.Tests.csproj
index f3dbcdd4..41525bcb 100644
--- a/src/StardewModdingAPI.Tests/StardewModdingAPI.Tests.csproj
+++ b/src/StardewModdingAPI.Tests/StardewModdingAPI.Tests.csproj
@@ -39,8 +39,8 @@
     <Reference Include="Newtonsoft.Json, Version=8.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
       <HintPath>..\packages\Newtonsoft.Json.8.0.3\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
-    <Reference Include="nunit.framework, Version=3.7.1.0, Culture=neutral, PublicKeyToken=2638cd05610744eb, processorArchitecture=MSIL">
-      <HintPath>..\packages\NUnit.3.7.1\lib\net45\nunit.framework.dll</HintPath>
+    <Reference Include="nunit.framework, Version=3.8.1.0, Culture=neutral, PublicKeyToken=2638cd05610744eb, processorArchitecture=MSIL">
+      <HintPath>..\packages\NUnit.3.8.1\lib\net45\nunit.framework.dll</HintPath>
     </Reference>
     <Reference Include="System" />
   </ItemGroup>
diff --git a/src/StardewModdingAPI.Tests/packages.config b/src/StardewModdingAPI.Tests/packages.config
index 6f04e625..5fdfebdb 100644
--- a/src/StardewModdingAPI.Tests/packages.config
+++ b/src/StardewModdingAPI.Tests/packages.config
@@ -3,5 +3,5 @@
   <package id="Castle.Core" version="4.1.1" targetFramework="net45" />
   <package id="Moq" version="4.7.99" targetFramework="net45" />
   <package id="Newtonsoft.Json" version="8.0.3" targetFramework="net45" />
-  <package id="NUnit" version="3.7.1" targetFramework="net45" />
-</packages>
\ No newline at end of file
+  <package id="NUnit" version="3.8.1" targetFramework="net45" />
+</packages>
diff --git a/src/StardewModdingAPI.Web/Controllers/ModsController.cs b/src/StardewModdingAPI.Web/Controllers/ModsController.cs
new file mode 100644
index 00000000..8fc2cb51
--- /dev/null
+++ b/src/StardewModdingAPI.Web/Controllers/ModsController.cs
@@ -0,0 +1,132 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Caching.Memory;
+using Microsoft.Extensions.Options;
+using StardewModdingAPI.Web.Framework.ConfigModels;
+using StardewModdingAPI.Web.Framework.ModRepositories;
+using StardewModdingAPI.Models;
+
+namespace StardewModdingAPI.Web.Controllers
+{
+    /// <summary>Provides an API to perform mod update checks.</summary>
+    [Produces("application/json")]
+    internal class ModsController : Controller
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The mod repositories which provide mod metadata.</summary>
+        private readonly IDictionary<string, IModRepository> Repositories;
+
+        /// <summary>The cache in which to store mod metadata.</summary>
+        private readonly IMemoryCache Cache;
+
+        /// <summary>The number of minutes update checks should be cached before refetching them.</summary>
+        private readonly int CacheMinutes;
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="cache">The cache in which to store mod metadata.</param>
+        /// <param name="configProvider">The config settings for mod update checks.</param>
+        public ModsController(IMemoryCache cache, IOptions<ModUpdateCheckConfig> configProvider)
+        {
+            ModUpdateCheckConfig config = configProvider.Value;
+
+            this.Cache = cache;
+            this.CacheMinutes = config.CacheMinutes;
+
+            this.Repositories =
+                new IModRepository[]
+                {
+                    new GitHubRepository(
+                        vendorKey: config.GitHubKey,
+                        baseUrl: config.GitHubBaseUrl,
+                        releaseUrlFormat: config.GitHubReleaseUrlFormat,
+                        userAgent: config.GitHubUserAgent,
+                        acceptHeader: config.GitHubAcceptHeader,
+                        username: config.GitHubUsername,
+                        password: config.GitHubPassword
+                    ),
+                    new NexusRepository(
+                        vendorKey: config.NexusKey,
+                        userAgent: config.NexusUserAgent,
+                        baseUrl: config.NexusBaseUrl,
+                        modUrlFormat: config.NexusModUrlFormat
+                    )
+                }
+                .ToDictionary(p => p.VendorKey, StringComparer.CurrentCultureIgnoreCase);
+        }
+
+        /// <summary>Fetch version metadata for the given mods.</summary>
+        /// <param name="modKeys">The namespaced mod keys to search as a comma-delimited array.</param>
+        [HttpGet]
+        public async Task<IDictionary<string, ModInfoModel>> GetAsync(string modKeys)
+        {
+            // sort & filter keys
+            string[] modKeysArray = (modKeys?.Split(',').Select(p => p.Trim()).ToArray() ?? new string[0])
+                .Distinct(StringComparer.CurrentCultureIgnoreCase)
+                .OrderBy(p => p, StringComparer.CurrentCultureIgnoreCase)
+                .ToArray();
+
+            // fetch mod info
+            IDictionary<string, ModInfoModel> result = new Dictionary<string, ModInfoModel>(StringComparer.CurrentCultureIgnoreCase);
+            foreach (string modKey in modKeysArray)
+            {
+                // parse mod key
+                if (!this.TryParseModKey(modKey, out string vendorKey, out string modID))
+                {
+                    result[modKey] = new ModInfoModel("The mod key isn't in a valid format. It should contain the mod repository key and mod ID like 'Nexus:541'.");
+                    continue;
+                }
+
+                // get matching repository
+                if (!this.Repositories.TryGetValue(vendorKey, out IModRepository repository))
+                {
+                    result[modKey] = new ModInfoModel("There's no mod repository matching this namespaced mod ID.");
+                    continue;
+                }
+
+                // fetch mod info
+                result[modKey] = await this.Cache.GetOrCreateAsync($"{repository.VendorKey}:{modID}".ToLower(), async entry =>
+                {
+                    entry.AbsoluteExpiration = DateTimeOffset.UtcNow.AddMinutes(this.CacheMinutes);
+                    return await repository.GetModInfoAsync(modID);
+                });
+            }
+
+            return result;
+        }
+
+
+        /*********
+        ** Private methods
+        *********/
+        /// <summary>Parse a namespaced mod ID.</summary>
+        /// <param name="raw">The raw mod ID to parse.</param>
+        /// <param name="vendorKey">The parsed vendor key.</param>
+        /// <param name="modID">The parsed mod ID.</param>
+        /// <returns>Returns whether the value could be parsed.</returns>
+        private bool TryParseModKey(string raw, out string vendorKey, out string modID)
+        {
+            // split parts
+            string[] parts = raw?.Split(':');
+            if (parts == null || parts.Length != 2)
+            {
+                vendorKey = null;
+                modID = null;
+                return false;
+            }
+
+            // parse
+            vendorKey = parts[0];
+            modID = parts[1];
+            return true;
+        }
+    }
+}
diff --git a/src/StardewModdingAPI.Web/Framework/ConfigModels/ModUpdateCheckConfig.cs b/src/StardewModdingAPI.Web/Framework/ConfigModels/ModUpdateCheckConfig.cs
new file mode 100644
index 00000000..5d55ba18
--- /dev/null
+++ b/src/StardewModdingAPI.Web/Framework/ConfigModels/ModUpdateCheckConfig.cs
@@ -0,0 +1,54 @@
+namespace StardewModdingAPI.Web.Framework.ConfigModels
+{
+    /// <summary>The config settings for mod update checks.</summary>
+    public class ModUpdateCheckConfig
+    {
+        /*********
+        ** Accessors
+        *********/
+        /****
+        ** General
+        ****/
+        /// <summary>The number of minutes update checks should be cached before refetching them.</summary>
+        public int CacheMinutes { get; set; }
+
+        /****
+        ** GitHub
+        ****/
+        /// <summary>The repository key for Nexus Mods.</summary>
+        public string GitHubKey { get; set; }
+
+        /// <summary>The user agent for the GitHub API client.</summary>
+        public string GitHubUserAgent { get; set; }
+
+        /// <summary>The base URL for the GitHub API.</summary>
+        public string GitHubBaseUrl { get; set; }
+
+        /// <summary>The URL for a GitHub API latest-release query excluding the <see cref="GitHubBaseUrl"/>, where {0} is the organisation and project name.</summary>
+        public string GitHubReleaseUrlFormat { get; set; }
+
+        /// <summary>The Accept header value expected by the GitHub API.</summary>
+        public string GitHubAcceptHeader { get; set; }
+
+        /// <summary>The username with which to authenticate to the GitHub API (if any).</summary>
+        public string GitHubUsername { get; set; }
+
+        /// <summary>The password with which to authenticate to the GitHub API (if any).</summary>
+        public string GitHubPassword { get; set; }
+
+        /****
+        ** Nexus Mods
+        ****/
+        /// <summary>The repository key for Nexus Mods.</summary>
+        public string NexusKey { get; set; }
+
+        /// <summary>The user agent for the Nexus Mods API client.</summary>
+        public string NexusUserAgent { get; set; }
+
+        /// <summary>The base URL for the Nexus Mods API.</summary>
+        public string NexusBaseUrl { get; set; }
+
+        /// <summary>The URL for a Nexus Mods API query excluding the <see cref="NexusBaseUrl"/>, where {0} is the mod ID.</summary>
+        public string NexusModUrlFormat { get; set; }
+    }
+}
diff --git a/src/StardewModdingAPI.Web/Framework/InternalControllerFeatureProvider.cs b/src/StardewModdingAPI.Web/Framework/InternalControllerFeatureProvider.cs
new file mode 100644
index 00000000..2c24c610
--- /dev/null
+++ b/src/StardewModdingAPI.Web/Framework/InternalControllerFeatureProvider.cs
@@ -0,0 +1,27 @@
+using System;
+using System.Reflection;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.Controllers;
+
+namespace StardewModdingAPI.Web.Framework
+{
+    /// <summary>Discovers controllers with support for non-public controllers.</summary>
+    internal class InternalControllerFeatureProvider : ControllerFeatureProvider
+    {
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Determines if a given type is a controller.</summary>
+        /// <param name="type">The <see cref="T:System.Reflection.TypeInfo" /> candidate.</param>
+        /// <returns><code>true</code> if the type is a controller; otherwise <code>false</code>.</returns>
+        protected override bool IsController(TypeInfo type)
+        {
+            return
+                type.IsClass
+                && !type.IsAbstract
+                && (/*type.IsPublic &&*/ !type.ContainsGenericParameters)
+                && (!type.IsDefined(typeof(NonControllerAttribute))
+                && (type.Name.EndsWith("Controller", StringComparison.OrdinalIgnoreCase) || type.IsDefined(typeof(ControllerAttribute))));
+        }
+    }
+}
diff --git a/src/StardewModdingAPI.Web/Framework/ModRepositories/GitHubRepository.cs b/src/StardewModdingAPI.Web/Framework/ModRepositories/GitHubRepository.cs
new file mode 100644
index 00000000..421220de
--- /dev/null
+++ b/src/StardewModdingAPI.Web/Framework/ModRepositories/GitHubRepository.cs
@@ -0,0 +1,95 @@
+using System;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+using Pathoschild.Http.Client;
+using StardewModdingAPI.Models;
+
+namespace StardewModdingAPI.Web.Framework.ModRepositories
+{
+    /// <summary>An HTTP client for fetching mod metadata from GitHub project releases.</summary>
+    internal class GitHubRepository : IModRepository
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The underlying HTTP client.</summary>
+        private readonly IClient Client;
+
+
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The unique key for this vendor.</summary>
+        public string VendorKey { get; }
+
+        /// <summary>The URL for a Nexus Mods API query excluding the base URL, where {0} is the mod ID.</summary>
+        public string ReleaseUrlFormat { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="vendorKey">The unique key for this vendor.</param>
+        /// <param name="baseUrl">The base URL for the Nexus Mods API.</param>
+        /// <param name="releaseUrlFormat">The URL for a Nexus Mods API query excluding the <paramref name="baseUrl"/>, where {0} is the mod ID.</param>
+        /// <param name="userAgent">The user agent for the GitHub API client.</param>
+        /// <param name="acceptHeader">The Accept header value expected by the GitHub API.</param>
+        /// <param name="username">The username with which to authenticate to the GitHub API.</param>
+        /// <param name="password">The password with which to authenticate to the GitHub API.</param>
+        public GitHubRepository(string vendorKey, string baseUrl, string releaseUrlFormat, string userAgent, string acceptHeader, string username, string password)
+        {
+            this.VendorKey = vendorKey;
+            this.ReleaseUrlFormat = releaseUrlFormat;
+
+            this.Client = new FluentClient(baseUrl)
+                .SetUserAgent(string.Format(userAgent, this.GetType().Assembly.GetName().Version))
+                .AddDefault(req => req.WithHeader("Accept", acceptHeader));
+            if (!string.IsNullOrWhiteSpace(username))
+                this.Client = this.Client.SetBasicAuthentication(username, password);
+        }
+
+        /// <summary>Get metadata about a mod in the repository.</summary>
+        /// <param name="id">The mod ID in this repository.</param>
+        public async Task<ModInfoModel> GetModInfoAsync(string id)
+        {
+            try
+            {
+                GitRelease release = await this.Client
+                    .GetAsync(string.Format(this.ReleaseUrlFormat, id))
+                    .As<GitRelease>();
+
+                return new ModInfoModel(id, release.Tag, $"https://github.com/{id}/releases");
+            }
+            catch (Exception ex)
+            {
+                return new ModInfoModel(ex.ToString());
+            }
+        }
+
+        /// <summary>Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.</summary>
+        public void Dispose()
+        {
+            this.Client.Dispose();
+        }
+
+
+        /*********
+        ** Private models
+        *********/
+        /// <summary>Metadata about a GitHub release tag.</summary>
+        private class GitRelease
+        {
+            /*********
+            ** Accessors
+            *********/
+            /// <summary>The display name.</summary>
+            [JsonProperty("name")]
+            public string Name { get; set; }
+
+            /// <summary>The semantic version string.</summary>
+            [JsonProperty("tag_name")]
+            public string Tag { get; set; }
+        }
+    }
+}
diff --git a/src/StardewModdingAPI.Web/Framework/ModRepositories/IModRepository.cs b/src/StardewModdingAPI.Web/Framework/ModRepositories/IModRepository.cs
new file mode 100644
index 00000000..98e4c957
--- /dev/null
+++ b/src/StardewModdingAPI.Web/Framework/ModRepositories/IModRepository.cs
@@ -0,0 +1,24 @@
+using System;
+using System.Threading.Tasks;
+using StardewModdingAPI.Models;
+
+namespace StardewModdingAPI.Web.Framework.ModRepositories
+{
+    /// <summary>A repository which provides mod metadata.</summary>
+    internal interface IModRepository : IDisposable
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The unique key for this vendor.</summary>
+        string VendorKey { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Get metadata about a mod in the repository.</summary>
+        /// <param name="id">The mod ID in this repository.</param>
+        Task<ModInfoModel> GetModInfoAsync(string id);
+    }
+}
diff --git a/src/StardewModdingAPI.Web/Framework/ModRepositories/NexusRepository.cs b/src/StardewModdingAPI.Web/Framework/ModRepositories/NexusRepository.cs
new file mode 100644
index 00000000..6cf5b04a
--- /dev/null
+++ b/src/StardewModdingAPI.Web/Framework/ModRepositories/NexusRepository.cs
@@ -0,0 +1,91 @@
+using System;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+using Pathoschild.Http.Client;
+using StardewModdingAPI.Models;
+
+namespace StardewModdingAPI.Web.Framework.ModRepositories
+{
+    /// <summary>An HTTP client for fetching mod metadata from Nexus Mods.</summary>
+    internal class NexusRepository : IModRepository
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The underlying HTTP client.</summary>
+        private readonly IClient Client;
+
+
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The unique key for this vendor.</summary>
+        public string VendorKey { get; }
+
+        /// <summary>The URL for a Nexus Mods API query excluding the base URL, where {0} is the mod ID.</summary>
+        public string ModUrlFormat { get; }
+
+
+        /*********
+        ** 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)
+        {
+            this.VendorKey = 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 async Task<ModInfoModel> GetModInfoAsync(string id)
+        {
+            try
+            {
+                NexusResponseModel response = await this.Client
+                    .GetAsync(string.Format(this.ModUrlFormat, id))
+                    .As<NexusResponseModel>();
+
+                return response != null
+                    ? new ModInfoModel(response.Name, 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 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; }
+        }
+    }
+}
diff --git a/src/StardewModdingAPI.Web/Framework/RewriteSubdomainRule.cs b/src/StardewModdingAPI.Web/Framework/RewriteSubdomainRule.cs
new file mode 100644
index 00000000..5a56844f
--- /dev/null
+++ b/src/StardewModdingAPI.Web/Framework/RewriteSubdomainRule.cs
@@ -0,0 +1,30 @@
+using System;
+using Microsoft.AspNetCore.Rewrite;
+
+namespace StardewModdingAPI.Web.Framework
+{
+    /// <summary>Rewrite requests to prepend the subdomain portion (if any) to the path.</summary>
+    /// <remarks>Derived from <a href="https://stackoverflow.com/a/44526747/262123" />.</remarks>
+    internal class RewriteSubdomainRule : IRule
+    {
+        /// <summary>Applies the rule. Implementations of ApplyRule should set the value for <see cref="RewriteContext.Result" /> (defaults to RuleResult.ContinueRules).</summary>
+        /// <param name="context">The rewrite context.</param>
+        public void ApplyRule(RewriteContext context)
+        {
+            context.Result = RuleResult.ContinueRules;
+
+            // get host parts
+            string host = context.HttpContext.Request.Host.Host;
+            string[] parts = host.Split('.');
+
+            // validate
+            if (parts.Length < 2)
+                return;
+            if (parts.Length < 3 && !"localhost".Equals(parts[1], StringComparison.InvariantCultureIgnoreCase))
+                return;
+
+            // prepend to path
+            context.HttpContext.Request.Path = $"/{parts[0]}{context.HttpContext.Request.Path}";
+        }
+    }
+}
diff --git a/src/StardewModdingAPI.Web/Program.cs b/src/StardewModdingAPI.Web/Program.cs
new file mode 100644
index 00000000..eeecb791
--- /dev/null
+++ b/src/StardewModdingAPI.Web/Program.cs
@@ -0,0 +1,26 @@
+using System.IO;
+using Microsoft.AspNetCore.Hosting;
+
+namespace StardewModdingAPI.Web
+{
+    /// <summary>The main app entry point.</summary>
+    public class Program
+    {
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>The main app entry point.</summary>
+        /// <param name="args">The command-line arguments.</param>
+        public static void Main(string[] args)
+        {
+            // configure web server
+            new WebHostBuilder()
+                .UseKestrel()
+                .UseContentRoot(Directory.GetCurrentDirectory())
+                .UseIISIntegration()
+                .UseStartup<Startup>()
+                .Build()
+                .Run();
+        }
+    }
+}
diff --git a/src/StardewModdingAPI.Web/Properties/launchSettings.json b/src/StardewModdingAPI.Web/Properties/launchSettings.json
new file mode 100644
index 00000000..3acee14d
--- /dev/null
+++ b/src/StardewModdingAPI.Web/Properties/launchSettings.json
@@ -0,0 +1,29 @@
+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:59482/",
+      "sslPort": 0
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExp