use POST for SMAPI update checks to avoid issues with long queries (#336)

3 files changed, 33 insertions, 18 deletions

diff --git a/src/StardewModdingAPI.Web/Controllers/ModsController.cs b/src/StardewModdingAPI.Web/Controllers/ModsController.cs
index 566577e4..f29de45a 100644
--- a/src/StardewModdingAPI.Web/Controllers/ModsController.cs
+++ b/src/StardewModdingAPI.Web/Controllers/ModsController.cs
@@ -14,6 +14,7 @@ namespace StardewModdingAPI.Web.Controllers
 {
     /// <summary>Provides an API to perform mod update checks.</summary>
     [Produces("application/json")]
+    [Route("api/{version:semanticVersion}/[controller]")]
     internal class ModsController : Controller
     {
         /*********
@@ -80,15 +81,27 @@ namespace StardewModdingAPI.Web.Controllers
         [HttpGet]
         public async Task<IDictionary<string, ModInfoModel>> GetAsync(string modKeys)
         {
+            string[] modKeysArray = modKeys?.Split(',').Select(p => p.Trim()).ToArray();
+            if (modKeysArray == null || !modKeysArray.Any())
+                return new Dictionary<string, ModInfoModel>();
+
+            return await this.PostAsync(new ModSearchModel(modKeysArray));
+        }
+
+        /// <summary>Fetch version metadata for the given mods.</summary>
+        /// <param name="search">The mod search criteria.</param>
+        [HttpPost]
+        public async Task<IDictionary<string, ModInfoModel>> PostAsync([FromBody] ModSearchModel search)
+        {
             // sort & filter keys
-            string[] modKeysArray = (modKeys?.Split(',').Select(p => p.Trim()).ToArray() ?? new string[0])
+            string[] modKeys = (search?.ModKeys?.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)
+            foreach (string modKey in modKeys)
             {
                 // parse mod key
                 if (!this.TryParseModKey(modKey, out string vendorKey, out string modID))
diff --git a/src/StardewModdingAPI.Web/Framework/VersionConstraint.cs b/src/StardewModdingAPI.Web/Framework/VersionConstraint.cs
new file mode 100644
index 00000000..be9c0918
--- /dev/null
+++ b/src/StardewModdingAPI.Web/Framework/VersionConstraint.cs
@@ -0,0 +1,15 @@
+using Microsoft.AspNetCore.Routing.Constraints;
+
+namespace StardewModdingAPI.Web.Framework
+{
+    /// <summary>Constrains a route value to a valid semantic version.</summary>
+    internal class VersionConstraint : RegexRouteConstraint
+    {
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        public VersionConstraint()
+            : base(@"^v(?>(?<major>0|[1-9]\d*))\.(?>(?<minor>0|[1-9]\d*))(?>(?:\.(?<patch>0|[1-9]\d*))?)(?:-(?<prerelease>(?>[a-z0-9]+[\-\.]?)+))?$") { }
+    }
+}
diff --git a/src/StardewModdingAPI.Web/Startup.cs b/src/StardewModdingAPI.Web/Startup.cs
index d5b828b7..eaf14983 100644
--- a/src/StardewModdingAPI.Web/Startup.cs
+++ b/src/StardewModdingAPI.Web/Startup.cs
@@ -1,6 +1,7 @@
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Rewrite;
+using Microsoft.AspNetCore.Routing;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
@@ -42,6 +43,7 @@ namespace StardewModdingAPI.Web
         {
             services
                 .Configure<ModUpdateCheckConfig>(this.Configuration.GetSection("ModUpdateCheck"))
+                .Configure<RouteOptions>(options => options.ConstraintMap.Add("semanticVersion", typeof(VersionConstraint)))
                 .AddMemoryCache()
                 .AddMvc()
                 .ConfigureApplicationPartManager(manager => manager.FeatureProviders.Add(new InternalControllerFeatureProvider()))
@@ -62,22 +64,7 @@ namespace StardewModdingAPI.Web
             loggerFactory.AddDebug();
             app
                 .UseRewriter(new RewriteOptions().Add(new RewriteSubdomainRule())) // convert subdomain.smapi.io => smapi.io/subdomain for routing
-                .UseMvc(route =>
-                {
-                    route.MapRoute(
-                        name: "API",
-                        template: "api/{version}/{controller}/{action?}",
-                        defaults: new
-                        {
-                            action = "GetAsync"
-                        },
-                        constraints: new
-                        {
-                            // version regex from SMAPI's SemanticVersion implementation
-                            version = @"^v(?>(?<major>0|[1-9]\d*))\.(?>(?<minor>0|[1-9]\d*))(?>(?:\.(?<patch>0|[1-9]\d*))?)(?:-(?<prerelease>(?>[a-z0-9]+[\-\.]?)+))?$"
-                        }
-                    );
-                });
+                .UseMvc();
         }
     }
 }