Unity Clipboard

Clipboard.cs

using UnityEngine;
#if UNITY_WEBGL && !UNITY_EDITOR
using System.Runtime.InteropServices;
#endif

public static class Clipboard {

    public static string ClipboardText {
        get { return clipboard_read_text(); }
        set { clipboard_write_text(value); }
    }

#if UNITY_WEBGL && !UNITY_EDITOR
    [DllImport("__Internal")] public static extern string clipboard_read_text();
    [DllImport("__Internal")] public static extern void clipboard_write_text(string text);
#else

    public static string clipboard_read_text() { return GUIUtility.systemCopyBuffer; }
    public static void clipboard_write_text(string text) { GUIUtility.systemCopyBuffer = text; }

#if UNITY_EDITOR
    private static string m_EmbeddedLib = @"
var ClipboardLib = {
  clipboard_read_text: function () {
    // NOOP
  },
  clipboard_write_text: function (str) {
    navigator.clipboard.writeText(Pointer_stringify(str));
  },
};

mergeInto(LibraryManager.library, ClipboardLib);
";

    [UnityEditor.InitializeOnLoadMethod]
    private static void ExtractJSLib() {
        var path = System.IO.Path.Combine(Application.dataPath, "Plugins");
        var folder = new System.IO.DirectoryInfo(path);
        if (!folder.Exists)
            folder.Create();
        path = System.IO.Path.Combine(path, "Clipboard.jslib");
        if (System.IO.File.Exists(path))
            return;
        Debug.Log("Clipboard.jslib does not exist in the plugins folder, extracting");
        System.IO.File.WriteAllText(path, m_EmbeddedLib);
        UnityEditor.AssetDatabase.Refresh();
        UnityEditor.EditorApplication.RepaintProjectWindow();
    }
#endif

#endif

}