feat: extensions to read get arguments and url-encoded-post args

Author: RobynLlama

src/SharpWebserver/Extensions/RequestExtensions.cs

@@ -0,0 +1,118 @@
+/*
+Copyright (C) 2025 Robyn (robyn@mamallama.dev)
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+*/
+
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.IO;
+using System.Net;
+
+namespace SharpWebserver.Extensions;
+public static class RequestExtensions
+{
+  public static string GetFirstOrDefaultForKey(this NameValueCollection query, string key)
+  {
+    if (query.GetValues(key) is not string[] values)
+      return string.Empty;
+
+    return values[0];
+  }
+
+  public static Dictionary<string, string> GetFirstOrDefaultForAll(this NameValueCollection query)
+  {
+    var keys = query.AllKeys;
+    var data = new Dictionary<string, string>();
+
+    foreach (var item in keys)
+    {
+      if (item is null)
+        continue;
+
+      data[item] = query.GetFirstOrDefaultForKey(item);
+    }
+
+    return data;
+  }
+
+  public static Dictionary<string, string>? GetDecodedFormDataFirstOrDefault(this HttpListenerRequest request)
+  {
+    var formData = new Dictionary<string, string>();
+
+    //name=value1&name=value2&name=value3
+
+    if (request.ContentType != "application/x-www-form-urlencoded" || request.ContentLength64 == 0)
+      return null;
+
+    using StreamReader data = new(request.InputStream);
+    //data.BaseStream.Seek(0, SeekOrigin.Begin);
+
+    string input = data.ReadToEnd();
+    string[] pairs = input.Split('&');
+
+    foreach (var item in pairs)
+    {
+      var kvp = item.Split('=');
+
+      if (kvp.Length != 2)
+        continue;
+
+      if (formData.TryGetValue(kvp[0], out var _))
+        continue;
+      else
+        formData[kvp[0]] = kvp[1];
+    }
+
+    return formData;
+  }
+
+  public static Dictionary<string, string[]>? GetDecodedFormData(this HttpListenerRequest request)
+  {
+    var formData = new Dictionary<string, List<string>>();
+
+    //name=value1&name=value2&name=value3
+
+    if (request.ContentType != "application/x-www-form-urlencoded" || request.ContentLength64 == 0)
+      return null;
+
+    using StreamReader data = new(request.InputStream);
+    //data.BaseStream.Seek(0, SeekOrigin.Begin);
+
+    string input = data.ReadToEnd();
+    string[] pairs = input.Split('&');
+
+    foreach (var item in pairs)
+    {
+      Logger.LogTrace("Splitting pair", [
+        ("Input", item)
+      ]);
+
+      var kvp = item.Split('=');
+
+      if (kvp.Length != 2)
+        continue;
+
+      List<string> addingList;
+
+      if (formData.TryGetValue(kvp[0], out var strings))
+        addingList = strings;
+      else
+        addingList = [];
+
+      addingList.Add(kvp[1]);
+      formData[kvp[0]] = addingList;
+    }
+
+    Dictionary<string, string[]> items = [];
+
+    //Convert to array
+    foreach (var item in formData)
+      items[item.Key] = [.. item.Value];
+
+    return items;
+  }
+}