1 files changed, 69 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);
+        }
     }
 }