Merge branch 'develop' into stable

17 files changed, 235 insertions, 91 deletions

diff --git a/src/SMAPI.Web/Controllers/IndexController.cs b/src/SMAPI.Web/Controllers/IndexController.cs
index 5d45118f..0464e50a 100644
--- a/src/SMAPI.Web/Controllers/IndexController.cs
+++ b/src/SMAPI.Web/Controllers/IndexController.cs
@@ -3,6 +3,7 @@ using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Caching.Memory;
+using StardewModdingAPI.Common;
 using StardewModdingAPI.Web.Framework.Clients.GitHub;
 using StardewModdingAPI.Web.ViewModels;
 
@@ -23,7 +24,10 @@ namespace StardewModdingAPI.Web.Controllers
         private readonly IGitHubClient GitHub;
 
         /// <summary>The cache time for release info.</summary>
-        private readonly TimeSpan CacheTime = TimeSpan.FromMinutes(5);
+        private readonly TimeSpan CacheTime = TimeSpan.FromSeconds(1);
+
+        /// <summary>The GitHub repository name to check for update.</summary>
+        private readonly string RepositoryName = "Pathoschild/SMAPI";
 
 
         /*********
@@ -42,17 +46,24 @@ namespace StardewModdingAPI.Web.Controllers
         [HttpGet]
         public async Task<ViewResult> Index()
         {
-            // fetch latest SMAPI release
-            GitRelease release = await this.Cache.GetOrCreateAsync("latest-smapi-release", async entry =>
+            // fetch SMAPI releases
+            IndexVersionModel stableVersion = await this.Cache.GetOrCreateAsync("stable-version", async entry =>
+            {
+                entry.AbsoluteExpiration = DateTimeOffset.UtcNow.Add(this.CacheTime);
+                GitRelease release = await this.GitHub.GetLatestReleaseAsync(this.RepositoryName, includePrerelease: false);
+                return new IndexVersionModel(release.Name, release.Body, this.GetMainDownloadUrl(release), this.GetDevDownloadUrl(release));
+            });
+            IndexVersionModel betaVersion = await this.Cache.GetOrCreateAsync("beta-version", async entry =>
             {
                 entry.AbsoluteExpiration = DateTimeOffset.UtcNow.Add(this.CacheTime);
-                return await this.GitHub.GetLatestReleaseAsync("Pathoschild/SMAPI");
+                GitRelease release = await this.GitHub.GetLatestReleaseAsync(this.RepositoryName, includePrerelease: true);
+                return release.IsPrerelease
+                    ? this.GetBetaDownload(release)
+                    : null;
             });
-            string downloadUrl = this.GetMainDownloadUrl(release);
-            string devDownloadUrl = this.GetDevDownloadUrl(release);
 
             // render view
-            var model = new IndexModel(release.Name, release.Body, downloadUrl, devDownloadUrl);
+            var model = new IndexModel(stableVersion, betaVersion);
             return this.View(model);
         }
 
@@ -89,5 +100,33 @@ namespace StardewModdingAPI.Web.Controllers
             // fallback just in case
             return "https://github.com/pathoschild/SMAPI/releases";
         }
+
+        /// <summary>Get the latest beta download for a SMAPI release.</summary>
+        /// <param name="release">The SMAPI release.</param>
+        private IndexVersionModel GetBetaDownload(GitRelease release)
+        {
+            // get download with the latest version
+            SemanticVersionImpl latestVersion = null;
+            string latestUrl = null;
+            foreach (GitAsset asset in release.Assets ?? new GitAsset[0])
+            {
+                // parse version
+                Match versionMatch = Regex.Match(asset.FileName, @"SMAPI-([\d\.]+(?:-.+)?)-installer.zip");
+                if (!versionMatch.Success || !SemanticVersionImpl.TryParse(versionMatch.Groups[1].Value, out SemanticVersionImpl version))
+                    continue;
+
+                // save latest version
+                if (latestVersion == null || latestVersion.CompareTo(version) < 0)
+                {
+                    latestVersion = version;
+                    latestUrl = asset.DownloadUrl;
+                }
+            }
+
+            // return if prerelease
+            return latestVersion?.Tag != null
+                ? new IndexVersionModel(latestVersion.ToString(), release.Body, latestUrl, null)
+                : null;
+        }
     }
 }
diff --git a/src/SMAPI.Web/Controllers/ModsApiController.cs b/src/SMAPI.Web/Controllers/ModsApiController.cs
index abae7db7..24517263 100644
--- a/src/SMAPI.Web/Controllers/ModsApiController.cs
+++ b/src/SMAPI.Web/Controllers/ModsApiController.cs
@@ -29,8 +29,11 @@ namespace StardewModdingAPI.Web.Controllers
         /// <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;
+        /// <summary>The number of minutes successful update checks should be cached before refetching them.</summary>
+        private readonly int SuccessCacheMinutes;
+
+        /// <summary>The number of minutes failed update checks should be cached before refetching them.</summary>
+        private readonly int ErrorCacheMinutes;
 
         /// <summary>A regex which matches SMAPI-style semantic version.</summary>
         private readonly string VersionRegex;
@@ -50,7 +53,8 @@ namespace StardewModdingAPI.Web.Controllers
             ModUpdateCheckConfig config = configProvider.Value;
 
             this.Cache = cache;
-            this.CacheMinutes = config.CacheMinutes;
+            this.SuccessCacheMinutes = config.SuccessCacheMinutes;
+            this.ErrorCacheMinutes = config.ErrorCacheMinutes;
             this.VersionRegex = config.SemanticVersionRegex;
             this.Repositories =
                 new IModRepository[]
@@ -115,13 +119,13 @@ namespace StardewModdingAPI.Web.Controllers
                     if (info.Error == null)
                     {
                         if (info.Version == null)
-                            info = new ModInfoModel(info.Name, info.Version, info.Url, "Mod has no version number.");
+                            info = new ModInfoModel(name: info.Name, version: info.Version, url: info.Url, error: "Mod has no version number.");
                         if (!allowInvalidVersions && !Regex.IsMatch(info.Version, this.VersionRegex, RegexOptions.CultureInvariant | RegexOptions.IgnoreCase))
-                            info = new ModInfoModel(info.Name, info.Version, info.Url, $"Mod has invalid semantic version '{info.Version}'.");
+                            info = new ModInfoModel(name: info.Name, version: info.Version, url: info.Url, error: $"Mod has invalid semantic version '{info.Version}'.");
                     }
 
                     // cache & return
-                    entry.AbsoluteExpiration = DateTimeOffset.UtcNow.AddMinutes(this.CacheMinutes);
+                    entry.AbsoluteExpiration = DateTimeOffset.UtcNow.AddMinutes(info.Error == null ? this.SuccessCacheMinutes : this.ErrorCacheMinutes);
                     return info;
                 });
             }
diff --git a/src/SMAPI.Web/Framework/Clients/GitHub/GitHubClient.cs b/src/SMAPI.Web/Framework/Clients/GitHub/GitHubClient.cs
index 0b205660..4abe0737 100644
--- a/src/SMAPI.Web/Framework/Clients/GitHub/GitHubClient.cs
+++ b/src/SMAPI.Web/Framework/Clients/GitHub/GitHubClient.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using System.Net;
 using System.Threading.Tasks;
 using Pathoschild.Http.Client;
@@ -11,8 +12,11 @@ namespace StardewModdingAPI.Web.Framework.Clients.GitHub
         /*********
         ** Properties
         *********/
-        /// <summary>The URL for a GitHub releases API query excluding the base URL, where {0} is the repository owner and name.</summary>
-        private readonly string ReleaseUrlFormat;
+        /// <summary>The URL for a GitHub API query for the latest stable release, excluding the base URL, where {0} is the organisation and project name.</summary>
+        private readonly string StableReleaseUrlFormat;
+
+        /// <summary>The URL for a GitHub API query for the latest release (including prerelease), excluding the base URL, where {0} is the organisation and project name.</summary>
+        private readonly string AnyReleaseUrlFormat;
 
         /// <summary>The underlying HTTP client.</summary>
         private readonly IClient Client;
@@ -23,14 +27,16 @@ namespace StardewModdingAPI.Web.Framework.Clients.GitHub
         *********/
         /// <summary>Construct an instance.</summary>
         /// <param name="baseUrl">The base URL for the GitHub API.</param>
-        /// <param name="releaseUrlFormat">The URL for a GitHub releases API query excluding the <paramref name="baseUrl"/>, where {0} is the repository owner and name.</param>
+        /// <param name="stableReleaseUrlFormat">The URL for a GitHub API query for the latest stable release, excluding the <paramref name="baseUrl"/>, where {0} is the organisation and project name.</param>
+        /// <param name="anyReleaseUrlFormat">The URL for a GitHub API query for the latest release (including prerelease), excluding the <paramref name="baseUrl"/>, where {0} is the organisation and project name.</param>
         /// <param name="userAgent">The user agent for the 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 GitHubClient(string baseUrl, string releaseUrlFormat, string userAgent, string acceptHeader, string username, string password)
+        public GitHubClient(string baseUrl, string stableReleaseUrlFormat, string anyReleaseUrlFormat, string userAgent, string acceptHeader, string username, string password)
         {
-            this.ReleaseUrlFormat = releaseUrlFormat;
+            this.StableReleaseUrlFormat = stableReleaseUrlFormat;
+            this.AnyReleaseUrlFormat = anyReleaseUrlFormat;
 
             this.Client = new FluentClient(baseUrl)
                 .SetUserAgent(userAgent)
@@ -41,18 +47,23 @@ namespace StardewModdingAPI.Web.Framework.Clients.GitHub
 
         /// <summary>Get the latest release for a GitHub repository.</summary>
         /// <param name="repo">The repository key (like <c>Pathoschild/SMAPI</c>).</param>
-        /// <returns>Returns the latest release if found, else <c>null</c>.</returns>
-        public async Task<GitRelease> GetLatestReleaseAsync(string repo)
+        /// <param name="includePrerelease">Whether to return a prerelease version if it's latest.</param>
+        /// <returns>Returns the release if found, else <c>null</c>.</returns>
+        public async Task<GitRelease> GetLatestReleaseAsync(string repo, bool includePrerelease = false)
         {
-            // validate key format
-            if (!repo.Contains("/") || repo.IndexOf("/", StringComparison.InvariantCultureIgnoreCase) != repo.LastIndexOf("/", StringComparison.InvariantCultureIgnoreCase))
-                throw new ArgumentException($"The value '{repo}' isn't a valid GitHub repository key, must be a username and project name like 'Pathoschild/SMAPI'.", nameof(repo));
-
-            // fetch info
+            this.AssetKeyFormat(repo);
             try
             {
+                if (includePrerelease)
+                {
+                    GitRelease[] results = await this.Client
+                        .GetAsync(string.Format(this.AnyReleaseUrlFormat, repo))
+                        .AsArray<GitRelease>();
+                    return results.FirstOrDefault();
+                }
+
                 return await this.Client
-                    .GetAsync(string.Format(this.ReleaseUrlFormat, repo))
+                    .GetAsync(string.Format(this.StableReleaseUrlFormat, repo))
                     .As<GitRelease>();
             }
             catch (ApiException ex) when (ex.Status == HttpStatusCode.NotFound)
@@ -66,5 +77,18 @@ namespace StardewModdingAPI.Web.Framework.Clients.GitHub
         {
             this.Client?.Dispose();
         }
+
+
+        /*********
+        ** Private methods
+        *********/
+        /// <summary>Assert that a repository key is formatted correctly.</summary>
+        /// <param name="repo">The repository key (like <c>Pathoschild/SMAPI</c>).</param>
+        /// <exception cref="ArgumentException">The repository key is invalid.</exception>
+        private void AssetKeyFormat(string repo)
+        {
+            if (repo == null || !repo.Contains("/") || repo.IndexOf("/", StringComparison.InvariantCultureIgnoreCase) != repo.LastIndexOf("/", StringComparison.InvariantCultureIgnoreCase))
+                throw new ArgumentException($"The value '{repo}' isn't a valid GitHub repository key, must be a username and project name like 'Pathoschild/SMAPI'.", nameof(repo));
+        }
     }
 }
diff --git a/src/SMAPI.Web/Framework/Clients/GitHub/GitRelease.cs b/src/SMAPI.Web/Framework/Clients/GitHub/GitRelease.cs
index b944088d..827374fb 100644
--- a/src/SMAPI.Web/Framework/Clients/GitHub/GitRelease.cs
+++ b/src/SMAPI.Web/Framework/Clients/GitHub/GitRelease.cs
@@ -19,6 +19,10 @@ namespace StardewModdingAPI.Web.Framework.Clients.GitHub
         /// <summary>The Markdown description for the release.</summary>
         public string Body { get; set; }
 
+        /// <summary>Whether this is a prerelease version.</summary>
+        [JsonProperty("prerelease")]
+        public bool IsPrerelease { get; set; }
+
         /// <summary>The attached files.</summary>
         public GitAsset[] Assets { get; set; }
     }
diff --git a/src/SMAPI.Web/Framework/Clients/GitHub/IGitHubClient.cs b/src/SMAPI.Web/Framework/Clients/GitHub/IGitHubClient.cs
index 6e8eadff..9519c26f 100644
--- a/src/SMAPI.Web/Framework/Clients/GitHub/IGitHubClient.cs
+++ b/src/SMAPI.Web/Framework/Clients/GitHub/IGitHubClient.cs
@@ -11,7 +11,8 @@ namespace StardewModdingAPI.Web.Framework.Clients.GitHub
         *********/
         /// <summary>Get the latest release for a GitHub repository.</summary>
         /// <param name="repo">The repository key (like <c>Pathoschild/SMAPI</c>).</param>
-        /// <returns>Returns the latest release if found, else <c>null</c>.</returns>
-        Task<GitRelease> GetLatestReleaseAsync(string repo);
+        /// <param name="includePrerelease">Whether to return a prerelease version if it's latest.</param>
+        /// <returns>Returns the release if found, else <c>null</c>.</returns>
+        Task<GitRelease> GetLatestReleaseAsync(string repo, bool includePrerelease = false);
     }
 }
diff --git a/src/SMAPI.Web/Framework/ConfigModels/ApiClientsConfig.cs b/src/SMAPI.Web/Framework/ConfigModels/ApiClientsConfig.cs
index 61219414..de6c024a 100644
--- a/src/SMAPI.Web/Framework/ConfigModels/ApiClientsConfig.cs
+++ b/src/SMAPI.Web/Framework/ConfigModels/ApiClientsConfig.cs
@@ -29,8 +29,11 @@ namespace StardewModdingAPI.Web.Framework.ConfigModels
         /// <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 URL for a GitHub API query for the latest stable release, excluding the <see cref="GitHubBaseUrl"/>, where {0} is the organisation and project name.</summary>
+        public string GitHubStableReleaseUrlFormat { get; set; }
+
+        /// <summary>The URL for a GitHub API query for the latest release (including prerelease), excluding the <see cref="GitHubBaseUrl"/>, where {0} is the organisation and project name.</summary>
+        public string GitHubAnyReleaseUrlFormat { get; set; }
 
         /// <summary>The Accept header value expected by the GitHub API.</summary>
         public string GitHubAcceptHeader { get; set; }
diff --git a/src/SMAPI.Web/Framework/ConfigModels/ModUpdateCheckConfig.cs b/src/SMAPI.Web/Framework/ConfigModels/ModUpdateCheckConfig.cs
index 58c3a100..fc3b7dc2 100644
--- a/src/SMAPI.Web/Framework/ConfigModels/ModUpdateCheckConfig.cs
+++ b/src/SMAPI.Web/Framework/ConfigModels/ModUpdateCheckConfig.cs
@@ -6,8 +6,11 @@ namespace StardewModdingAPI.Web.Framework.ConfigModels
         /*********
         ** Accessors
         *********/
-        /// <summary>The number of minutes update checks should be cached before refetching them.</summary>
-        public int CacheMinutes { get; set; }
+        /// <summary>The number of minutes successful update checks should be cached before refetching them.</summary>
+        public int SuccessCacheMinutes { get; set; }
+
+        /// <summary>The number of minutes failed update checks should be cached before refetching them.</summary>
+        public int ErrorCacheMinutes { get; set; }
 
         /// <summary>A regex which matches SMAPI-style semantic version.</summary>
         /// <remarks>Derived from SMAPI's SemanticVersion implementation.</remarks>
diff --git a/src/SMAPI.Web/Framework/ModRepositories/ChucklefishRepository.cs b/src/SMAPI.Web/Framework/ModRepositories/ChucklefishRepository.cs
index 266055a6..3e5a4272 100644
--- a/src/SMAPI.Web/Framework/ModRepositories/ChucklefishRepository.cs
+++ b/src/SMAPI.Web/Framework/ModRepositories/ChucklefishRepository.cs
@@ -43,7 +43,7 @@ namespace StardewModdingAPI.Web.Framework.ModRepositories
                     return new ModInfoModel("Found no mod with this ID.");
 
                 // create model
-                return new ModInfoModel(mod.Name, this.NormaliseVersion(mod.Version), mod.Url);
+                return new ModInfoModel(name: mod.Name, version: this.NormaliseVersion(mod.Version), url: mod.Url);
             }
             catch (Exception ex)
             {
diff --git a/src/SMAPI.Web/Framework/ModRepositories/GitHubRepository.cs b/src/SMAPI.Web/Framework/ModRepositories/GitHubRepository.cs
index 7bad6127..59eb8cd1 100644
--- a/src/SMAPI.Web/Framework/ModRepositories/GitHubRepository.cs
+++ b/src/SMAPI.Web/Framework/ModRepositories/GitHubRepository.cs
@@ -38,10 +38,21 @@ namespace StardewModdingAPI.Web.Framework.ModRepositories
             // fetch info
             try
             {
-                GitRelease release = await this.Client.GetLatestReleaseAsync(id);
-                return release != null
-                    ? new ModInfoModel(id, this.NormaliseVersion(release.Tag), $"https://github.com/{id}/releases")
-                    : new ModInfoModel("Found no mod with this ID.");
+                // get latest release
+                GitRelease latest = await this.Client.GetLatestReleaseAsync(id, includePrerelease: true);
+                GitRelease preview = null;
+                if (latest == null)
+                    return new ModInfoModel("Found no mod with this ID.");
+
+                // get latest stable release (if not latest)
+                if (latest.IsPrerelease)
+                {
+                    preview = latest;
+                    latest = await this.Client.GetLatestReleaseAsync(id, includePrerelease: false);
+                }
+
+                // return data
+                return new ModInfoModel(name: id, version: this.NormaliseVersion(latest?.Tag), previewVersion: this.NormaliseVersion(preview?.Tag), url: $"https://github.com/{id}/releases");
             }
             catch (Exception ex)
             {
diff --git a/src/SMAPI.Web/Framework/ModRepositories/NexusRepository.cs b/src/SMAPI.Web/Framework/ModRepositories/NexusRepository.cs
index e1dc0fcc..6411ad4c 100644
--- a/src/SMAPI.Web/Framework/ModRepositories/NexusRepository.cs
+++ b/src/SMAPI.Web/Framework/ModRepositories/NexusRepository.cs
@@ -43,7 +43,7 @@ namespace StardewModdingAPI.Web.Framework.ModRepositories
                     return new ModInfoModel("Found no mod with this ID.");
                 if (mod.Error != null)
                     return new ModInfoModel(mod.Error);
-                return new ModInfoModel(mod.Name, this.NormaliseVersion(mod.Version), mod.Url);
+                return new ModInfoModel(name: mod.Name, version: this.NormaliseVersion(mod.Version), url: mod.Url);
             }
             catch (Exception ex)
             {
diff --git a/src/SMAPI.Web/StardewModdingAPI.Web.csproj b/src/SMAPI.Web/StardewModdingAPI.Web.csproj
index 19198503..e2eee8a8 100644
--- a/src/SMAPI.Web/StardewModdingAPI.Web.csproj
+++ b/src/SMAPI.Web/StardewModdingAPI.Web.csproj
@@ -10,13 +10,13 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="HtmlAgilityPack" Version="1.6.0" />
-    <PackageReference Include="Markdig" Version="0.14.8" />
-    <PackageReference Include="Microsoft.AspNetCore" Version="2.0.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.0.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Rewrite" Version="2.0.0" />
-    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="2.0.0" />
+    <PackageReference Include="HtmlAgilityPack" Version="1.7.2" />
+    <PackageReference Include="Markdig" Version="0.14.9" />
+    <PackageReference Include="Microsoft.AspNetCore" Version="2.0.2" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.0.3" />
+    <PackageReference Include="Microsoft.AspNetCore.Rewrite" Version="2.0.2" />
+    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="2.0.2" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="2.0.1" />
     <PackageReference Include="Pathoschild.Http.FluentClient" Version="3.1.0" />
   </ItemGroup>
   <ItemGroup>
diff --git a/src/SMAPI.Web/Startup.cs b/src/SMAPI.Web/Startup.cs
index d7d4d074..47102e5c 100644
--- a/src/SMAPI.Web/Startup.cs
+++ b/src/SMAPI.Web/Startup.cs
@@ -74,7 +74,8 @@ namespace StardewModdingAPI.Web
 
                 services.AddSingleton<IGitHubClient>(new GitHubClient(
                     baseUrl: api.GitHubBaseUrl,
-                    releaseUrlFormat: api.GitHubReleaseUrlFormat,
+                    stableReleaseUrlFormat: api.GitHubStableReleaseUrlFormat,
+                    anyReleaseUrlFormat: api.GitHubAnyReleaseUrlFormat,
                     userAgent: userAgent,
                     acceptHeader: api.GitHubAcceptHeader,
                     username: api.GitHubUsername,
diff --git a/src/SMAPI.Web/ViewModels/IndexModel.cs b/src/SMAPI.Web/ViewModels/IndexModel.cs
index 6d3da91e..4268c878 100644
--- a/src/SMAPI.Web/ViewModels/IndexModel.cs
+++ b/src/SMAPI.Web/ViewModels/IndexModel.cs
@@ -6,17 +6,11 @@ namespace StardewModdingAPI.Web.ViewModels
         /*********
         ** Accessors
         *********/
-        /// <summary>The latest SMAPI version.</summary>
-        public string LatestVersion { get; set; }
+        /// <summary>The latest stable SMAPI version.</summary>
+        public IndexVersionModel StableVersion { get; set; }
 
-        /// <summary>The Markdown description for the release.</summary>
-        public string Description { get; set; }
-
-        /// <summary>The main download URL.</summary>
-        public string DownloadUrl { get; set; }
-
-        /// <summary>The for-developers download URL.</summary>
-        public string DevDownloadUrl { get; set; }
+        /// <summary>The latest prerelease SMAPI version (if newer than <see cref="StableVersion"/>).</summary>
+        public IndexVersionModel BetaVersion { get; set; }
 
 
         /*********
@@ -26,16 +20,12 @@ namespace StardewModdingAPI.Web.ViewModels
         public IndexModel() { }
 
         /// <summary>Construct an instance.</summary>
-        /// <param name="latestVersion">The latest SMAPI version.</param>
-        /// <param name="description">The Markdown description for the release.</param>
-        /// <param name="downloadUrl">The main download URL.</param>
-        /// <param name="devDownloadUrl">The for-developers download URL.</param>
-        internal IndexModel(string latestVersion, string description, string downloadUrl, string devDownloadUrl)
+        /// <param name="stableVersion">The latest stable SMAPI version.</param>
+        /// <param name="betaVersion">The latest prerelease SMAPI version (if newer than <paramref name="stableVersion"/>).</param>
+        internal IndexModel(IndexVersionModel stableVersion, IndexVersionModel betaVersion)
         {
-            this.LatestVersion = latestVersion;
-            this.Description = description;
-            this.DownloadUrl = downloadUrl;
-            this.DevDownloadUrl = devDownloadUrl;
+            this.StableVersion = stableVersion;
+            this.BetaVersion = betaVersion;
         }
     }
 }
diff --git a/src/SMAPI.Web/ViewModels/IndexVersionModel.cs b/src/SMAPI.Web/ViewModels/IndexVersionModel.cs
new file mode 100644
index 00000000..4f63b979
--- /dev/null
+++ b/src/SMAPI.Web/ViewModels/IndexVersionModel.cs
@@ -0,0 +1,41 @@
+namespace StardewModdingAPI.Web.ViewModels
+{
+    /// <summary>The fields for a SMAPI version.</summary>
+    public class IndexVersionModel
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The release version.</summary>
+        public string Version { get; set; }
+
+        /// <summary>The Markdown description for the release.</summary>
+        public string Description { get; set; }
+
+        /// <summary>The main download URL.</summary>
+        public string DownloadUrl { get; set; }
+
+        /// <summary>The for-developers download URL (not applicable for prerelease versions).</summary>
+        public string DevDownloadUrl { get; set; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        public IndexVersionModel() { }
+
+        /// <summary>Construct an instance.</summary>
+        /// <param name="version">The release number.</param>
+        /// <param name="description">The Markdown description for the release.</param>
+        /// <param name="downloadUrl">The main download URL.</param>
+        /// <param name="devDownloadUrl">The for-developers download URL (not applicable for prerelease versions).</param>
+        internal IndexVersionModel(string version, string description, string downloadUrl, string devDownloadUrl)
+        {
+            this.Version = version;
+            this.Description = description;
+            this.DownloadUrl = downloadUrl;
+            this.DevDownloadUrl = devDownloadUrl;
+        }
+    }
+}
diff --git a/src/SMAPI.Web/Views/Index/Index.cshtml b/src/SMAPI.Web/Views/Index/Index.cshtml
index ad58898e..4efb9f8a 100644
--- a/src/SMAPI.Web/Views/Index/Index.cshtml
+++ b/src/SMAPI.Web/Views/Index/Index.cshtml
@@ -13,7 +13,11 @@
 </p>
 
 <div id="call-to-action">
-    <a href="@Model.DownloadUrl" class="main-cta">Download SMAPI @Model.LatestVersion</a><br />
+    <a href="@Model.StableVersion.DownloadUrl" class="main-cta">Download SMAPI @Model.StableVersion.Version</a><br />
+    @if (Model.BetaVersion != null)
+    {
+        <a href="@Model.BetaVersion.DownloadUrl" class="secondary-cta">Download SMAPI @Model.BetaVersion.Version<br /><small>for Stardew Valley 1.3 beta</small></a><br />
+    }
     <a href="https://stardewvalleywiki.com/Modding:Installing_SMAPI" class="secondary-cta">Install guide</a><br />
     <a href="https://stardewvalleywiki.com/Modding:Player_FAQs" class="secondary-cta">FAQs</a><br />
     <img src="favicon.ico" />
@@ -25,12 +29,29 @@
     <li>Get help <a href="https://stardewvalleywiki.com/Modding:Community#Discord">on Discord</a> or <a href="https://community.playstarbound.com/threads/smapi-stardew-modding-api.108375/">in the forums</a></li>
 </ul>
 
-<h2>What's new in SMAPI @Model.LatestVersion?</h2>
-<div class="github-description">
-    @Html.Raw(Markdig.Markdown.ToHtml(Model.Description))
-</div>
+@if (Model.BetaVersion == null)
+{
+    <h2>What's new in SMAPI @Model.StableVersion.Version?</h2>
+    <div class="github-description">
+        @Html.Raw(Markdig.Markdown.ToHtml(Model.StableVersion.Description))
+    </div>
+    <p>See the <a href="https://github.com/Pathoschild/SMAPI/blob/develop/docs/release-notes.md#release-notes">release notes</a> and <a href="https://stardewvalleywiki.com/Modding:SMAPI_compatibility">mod compatibility list</a> for more info.</p>
+}
+else
+{
+    <h2>What's new in...</h2>
+    <h3>SMAPI @Model.StableVersion.Version?</h3>
+    <div class="github-description">
+        @Html.Raw(Markdig.Markdown.ToHtml(Model.StableVersion.Description))
+    </div>
+    <p>See the <a href="https://github.com/Pathoschild/SMAPI/blob/develop/docs/release-notes.md#release-notes">release notes</a> and <a href="https://stardewvalleywiki.com/Modding:SMAPI_compatibility">mod compatibility list</a> for more info.</p>
 
-<p>See the <a href="https://github.com/Pathoschild/SMAPI/blob/develop/docs/release-notes.md#release-notes">release notes</a> and <a href="https://stardewvalleywiki.com/Modding:SMAPI_compatibility">mod compatibility list</a> for more info.</p>
+    <h3>SMAPI @Model.BetaVersion.Version?</h3>
+    <div class="github-description">
+        @Html.Raw(Markdig.Markdown.ToHtml(Model.BetaVersion.Description))
+    </div>
+    <p>See the <a href="https://github.com/Pathoschild/SMAPI/blob/develop/docs/release-notes.md#release-notes">release notes</a> and <a href="https://stardewvalleywiki.com/Modding:SMAPI_compatibility">mod compatibility list</a> for more info.</p>
+}
 
 <h2>Donate to support SMAPI ♥</h2>
 <p>
@@ -62,7 +83,7 @@
 
 <h2>For mod creators</h2>
 <ul>
-    <li><a href="@Model.DevDownloadUrl">SMAPI @Model.LatestVersion for developers</a> (includes <a href="https://docs.microsoft.com/en-us/visualstudio/ide/using-intellisense">intellisense</a> and full console output)</li>
+    <li><a href="@Model.StableVersion.DevDownloadUrl">SMAPI @Model.StableVersion.Version for developers</a> (includes <a href="https://docs.microsoft.com/en-us/visualstudio/ide/using-intellisense">intellisense</a> and full console output)</li>
     <li><a href="https://stardewvalleywiki.com/Modding:Index">Modding documentation</a></li>
     <li>Need help? Come <a href="https://stardewvalleywiki.com/Modding:Community#Discord">chat on Discord</a>.</li>
 </ul>
diff --git a/src/SMAPI.Web/Views/LogParser/Index.cshtml b/src/SMAPI.Web/Views/LogParser/Index.cshtml
index d2d8004e..7213e286 100644
--- a/src/SMAPI.Web/Views/LogParser/Index.cshtml
+++ b/src/SMAPI.Web/Views/LogParser/Index.cshtml
@@ -54,19 +54,19 @@
             <caption>Game info:</caption>
             <tr>
                 <td>SMAPI version:</td>
-                <td>@Model.ParsedLog.ApiVersion</td>
+                <td v-pre>@Model.ParsedLog.ApiVersion</td>
             </tr>
             <tr>
                 <td>Game version:</td>
-                <td>@Model.ParsedLog.GameVersion</td>
+                <td v-pre>@Model.ParsedLog.GameVersion</td>
             </tr>
             <tr>
                 <td>Platform:</td>
-                <td>@Model.ParsedLog.OperatingSystem</td>
+                <td v-pre>@Model.ParsedLog.OperatingSystem</td>
             </tr>
             <tr>
                 <td>Mods path:</td>
-                <td>@Model.ParsedLog.ModPath</td>
+                <td v-pre>@Model.ParsedLog.ModPath</td>
             </tr>
             <tr>
                 <td>Log started:</td>
@@ -85,7 +85,7 @@
             {
                 <tr v-on:click="toggleMod('@GetSlug(mod.Name)')" class="mod-entry" v-bind:class="{ hidden: !showMods['@GetSlug(mod.Name)'] }">
                     <td><input type="checkbox" v-bind:checked="showMods['@GetSlug(mod.Name)']" v-show="anyModsHidden" /></td>
-                    <td>
+                    <td v-pre>
                         @mod.Name
                         @if (contentPacks != null && contentPacks.TryGetValue(mod.Name, out LogModInfo[] contentPackList))
                         {
@@ -97,19 +97,19 @@
                             </div>
                         }
                     </td>
-                    <td>@mod.Version</td>
-                    <td>@mod.Author</td>
+                    <td v-pre>@mod.Version</td>
+                    <td v-pre>@mod.Author</td>
                     @if (mod.Errors == 0)
                     {
-                        <td class="color-green">no errors</td>
+                        <td v-pre class="color-green">no errors</td>
                     }
                     else if (mod.Errors == 1)
                     {
-                        <td class="color-red">@mod.Errors error</td>
+                        <td v-pre class="color-red">@mod.Errors error</td>
                     }
                     else
                     {
-                        <td class="color-red">@mod.Errors errors</td>
+                        <td v-pre class="color-red">@mod.Errors errors</td>
                     }
                 </tr>
             }
@@ -130,16 +130,16 @@
                 string levelStr = message.Level.ToString().ToLower();
 
                 <tr class="@levelStr mod" v-show="filtersAllow('@GetSlug(message.Mod)', '@levelStr')">
-                    <td>@message.Time</td>
-                    <td>@message.Level.ToString().ToUpper()</td>
-                    <td data-title="@message.Mod">@message.Mod</td>
-                    <td>@message.Text</td>
+                    <td v-pre>@message.Time</td>
+                    <td v-pre>@message.Level.ToString().ToUpper()</td>
+                    <td v-pre data-title="@message.Mod">@message.Mod</td>
+                    <td v-pre>@message.Text</td>
                 </tr>
                 if (message.Repeated > 0)
                 {
                     <tr class="@levelStr mod mod-repeat" v-show="filtersAllow('@GetSlug(message.Mod)', '@levelStr')">
                         <td colspan="3"></td>
-                        <td><i>repeats [@message.Repeated] times.</i></td>
+                        <td v-pre><i>repeats [@message.Repeated] times.</i></td>
                     </tr>
                 }
             }
@@ -151,11 +151,11 @@ else if (Model.ParsedLog?.IsValid == false)
     <h2>Parsed log</h2>
     <div id="error" class="color-red">
         <p><strong>We couldn't parse that file, but you can still share the link.</strong></p>
-        <p>Error details: @Model.ParsedLog.Error</p>
+        <p v-pre>Error details: @Model.ParsedLog.Error</p>
     </div>
 
     <h3>Raw log</h3>
-    <pre>@Model.ParsedLog.RawText</pre>
+    <pre v-pre>@Model.ParsedLog.RawText</pre>
 }
 
 <div id="upload-area">
diff --git a/src/SMAPI.Web/appsettings.json b/src/SMAPI.Web/appsettings.json
index 3cf72ddb..03ca31ed 100644
--- a/src/SMAPI.Web/appsettings.json
+++ b/src/SMAPI.Web/appsettings.json
@@ -24,7 +24,8 @@
     "ChucklefishModPageUrlFormat": "resources/{0}",
 
     "GitHubBaseUrl": "https://api.github.com",
-    "GitHubReleaseUrlFormat": "repos/{0}/releases/latest",
+    "GitHubStableReleaseUrlFormat": "repos/{0}/releases/latest",
+    "GitHubAnyReleaseUrlFormat": "repos/{0}/releases?per_page=1",
     "GitHubAcceptHeader": "application/vnd.github.v3+json",
     "GitHubUsername": null, // see top note
     "GitHubPassword": null, // see top note
@@ -39,7 +40,8 @@
   },
 
   "ModUpdateCheck": {
-    "CacheMinutes": 60,
+    "SuccessCacheMinutes": 60,
+    "ErrorCacheMinutes": 5,
     "SemanticVersionRegex": "^(?>(?<major>0|[1-9]\\d*))\\.(?>(?<minor>0|[1-9]\\d*))(?>(?:\\.(?<patch>0|[1-9]\\d*))?)(?:-(?<prerelease>(?>[a-z0-9]+[\\-\\.]?)+))?$",
 
     "ChucklefishKey": "Chucklefish",