1 files changed, 73 insertions, 0 deletions
diff --git a/src/StardewModdingAPI.Toolkit/Framework/UpdateData/UpdateKey.cs b/src/StardewModdingAPI.Toolkit/Framework/UpdateData/UpdateKey.cs
new file mode 100644
index 00000000..865ebcf7
--- /dev/null
+++ b/src/StardewModdingAPI.Toolkit/Framework/UpdateData/UpdateKey.cs
@@ -0,0 +1,73 @@
+using System;
+
+namespace StardewModdingAPI.Toolkit.Framework.UpdateData
+{
+    /// <summary>A namespaced mod ID which uniquely identifies a mod within a mod repository.</summary>
+    public class UpdateKey
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The raw update key text.</summary>
+        public string RawText { get; }
+
+        /// <summary>The mod repository containing the mod.</summary>
+        public ModRepositoryKey Repository { get; }
+
+        /// <summary>The mod ID within the repository.</summary>
+        public string ID { get; }
+
+        /// <summary>Whether the update key seems to be valid.</summary>
+        public bool LooksValid { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="rawText">The raw update key text.</param>
+        /// <param name="repository">The mod repository containing the mod.</param>
+        /// <param name="id">The mod ID within the repository.</param>
+        public UpdateKey(string rawText, ModRepositoryKey repository, string id)
+        {
+            this.RawText = rawText;
+            this.Repository = repository;
+            this.ID = id;
+            this.LooksValid =
+                repository != ModRepositoryKey.Unknown
+                && !string.IsNullOrWhiteSpace(id);
+        }
+
+        /// <summary>Parse a raw update key.</summary>
+        /// <param name="raw">The raw update key to parse.</param>
+        public static UpdateKey Parse(string raw)
+        {
+            // split parts
+            string[] parts = raw?.Split(':');
+            if (parts == null || parts.Length != 2)
+                return new UpdateKey(raw, ModRepositoryKey.Unknown, null);
+
+            // extract parts
+            string repositoryKey = parts[0].Trim();
+            string id = parts[1].Trim();
+            if (string.IsNullOrWhiteSpace(id))
+                id = null;
+
+            // parse
+            if (!Enum.TryParse(repositoryKey, true, out ModRepositoryKey repository))
+                return new UpdateKey(raw, ModRepositoryKey.Unknown, id);
+            if (id == null)
+                return new UpdateKey(raw, repository, null);
+
+            return new UpdateKey(raw, repository, id);
+        }
+
+        /// <summary>Get a string that represents the current object.</summary>
+        public override string ToString()
+        {
+            return this.LooksValid
+                ? $"{this.Repository}:{this.ID}"
+                : this.RawText;
+        }
+    }
+}