5 files changed, 101 insertions, 1 deletions
diff --git a/ApiController.cs b/ApiController.cs
index 3b75419..4257554 100644
--- a/ApiController.cs
+++ b/ApiController.cs
@@ -1,5 +1,6 @@
 using Microsoft.AspNetCore.Mvc;
 using System.Collections.Generic;
+using Npgsql;
 using System.Net;
 
 namespace download;
@@ -8,6 +9,73 @@ public class ApiController : Controller
 {
     public IActionResult Get(string? key)
     {
-        return StatusCode((int)HttpStatusCode.OK, "Hello World - " + key);
+        FileObject? file = GetDownload(key);
+
+        if (file == null)
+        {
+            return StatusCode((int)HttpStatusCode.NotFound, String.Empty);
+        }
+
+        RecordDownload(key,
+                       Request?.HttpContext?.Connection?.RemoteIpAddress?.ToString() ?? "IP address unknown",
+                       Request?.Headers?.UserAgent.ToString() ?? "User agent unknown",
+                       DateTime.UtcNow);
+        
+        return File(file.Data, file.MimeType, file.FileName);
+    }
+
+    private FileObject? GetDownload(string key)
+    {
+        FileObject? ret = null;
+
+        try
+        {
+            using var conn = new NpgsqlConnection(Config.Settings["ConnectionStrings:download"]);
+
+            conn.Open();
+
+            using var cmd = new NpgsqlCommand("SELECT mime_type, file_name, data FROM file_object WHERE key = @key", conn);
+            cmd.Parameters.AddWithValue("key", NpgsqlTypes.NpgsqlDbType.Varchar, key);
+            using var reader = cmd.ExecuteReader();
+
+            if(reader.Read())
+            {
+                ret = new FileObject(key, (string)reader["mime_type"], (string)reader["file_name"], (byte[])reader["data"]);
+            }
+        }
+        catch(Exception e)
+        {
+            System.Diagnostics.Debug.WriteLine("GetDownload: Caught exception {0} - {1}", e.GetType().ToString(), e.Message);
+        }
+
+        return ret;
+    }
+
+    private void RecordDownload(string key, string ip_address, string user_agent, DateTime time)
+    {
+        try
+        {
+            using var conn = new NpgsqlConnection(Config.Settings["ConnectionStrings:download"]);
+
+            conn.Open();
+
+            using var cmd = new NpgsqlCommand("INSERT INTO file_object (key, ip_address, user_agent, time) VALUES (@key, @ip_address, @user_agent, @time)", conn);
+
+            if (user_agent.Length > 256)
+            {
+                user_agent = user_agent.Substring(0,256);
+            }
+
+            cmd.Parameters.AddWithValue("key", NpgsqlTypes.NpgsqlDbType.Varchar, key);
+            cmd.Parameters.AddWithValue("ip_address", NpgsqlTypes.NpgsqlDbType.Varchar, ip_address);
+            cmd.Parameters.AddWithValue("user_agent", NpgsqlTypes.NpgsqlDbType.Varchar, user_agent);
+            cmd.Parameters.AddWithValue("time", NpgsqlTypes.NpgsqlDbType.Timestamp, time);
+
+            cmd.ExecuteNonQuery();
+        }
+        catch(Exception e)
+        {
+            System.Diagnostics.Debug.WriteLine("RecordDownload: Caught exception {0} - {1}", e.GetType().ToString(), e.Message);
+        }
     }
 }
diff --git a/Config.cs b/Config.cs
new file mode 100644
index 0000000..a361719
--- /dev/null
+++ b/Config.cs
@@ -0,0 +1,6 @@
+namespace download;
+
+public static class Config
+{
+    static public IConfiguration Settings {get; set;}
+}
diff --git a/FileObject.cs b/FileObject.cs
new file mode 100644
index 0000000..00c1784
--- /dev/null
+++ b/FileObject.cs
@@ -0,0 +1,18 @@
+namespace download;
+
+public class FileObject
+{
+    public string Key {get;private set;}
+    public string MimeType {get;private set;}
+    public string FileName {get;private set;}
+    public byte[] Data {get;private set;}
+
+    public FileObject(string key, string mimetype, string filename, byte[] data)
+    {
+        Key = key;
+        MimeType = mimetype;
+        FileName = filename;
+        Data = data;
+    }
+
+}
diff --git a/Program.cs b/Program.cs
index 1b97a78..a205fe2 100644
--- a/Program.cs
+++ b/Program.cs
@@ -1,3 +1,5 @@
+using download;
+
 var builder = WebApplication.CreateBuilder(args);
 
 builder.Services.AddControllersWithViews();
@@ -13,4 +15,6 @@ app.UseAuthorization();
 
 app.MapControllerRoute(name: "default", pattern: "{controller=Api}/{action=Get}/{key}");
 
+Config.Settings = app.Configuration;
+
 app.Run();
diff --git a/download.csproj b/download.csproj
index 13d8127..439e5d7 100644
--- a/download.csproj
+++ b/download.csproj
@@ -6,4 +6,8 @@
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="npgsql" Version="8.0.2" />
+  </ItemGroup>
+
 </Project>