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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>There&#8217;s no way to currently do this from the DLR and I suspect
it&#8217;s beyond the scope of both the DLR and IronPython.&nbsp; What you might be able
to do is create an AppDomain with limited permissions and therefore prevent the
loading of assemblies at the lower level.&nbsp; Once you&#8217;ve done that the DLR
hosting APIs have support for loading them in a remote app domain.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The reason why we wouldn&#8217;t do this directly is it&#8217;s very hard to
prevent access.&nbsp; Once you can do import clr you can do:<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>clr.GetClrType(str).Assembly.System.Reflection.Assembly.Load(&#8230;)<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>and there&#8217;s likely other ways to get around any walls we could
put up (e.g. &#8216;abc&#8217;.GetType().Assembly&#8230;&nbsp; not to mention any othe APIs that could
return types).<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> users-bounces@lists.ironpython.com
[mailto:users-bounces@lists.ironpython.com] <b>On Behalf Of </b>Michael
Cummings<br>
<b>Sent:</b> Thursday, March 27, 2008 12:01 PM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> [IronPython] DLR Hosting Question<o:p></o:p></span></p>

</div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>Hi all,<br>
&nbsp; I'm putting together a seminar at our local Code Camp for hosting the
DLR and integration with applications. The hosting spec pdf is great however I
do have (at least) one question that isn't explained very well in the doc. How
can I restrict what assemblies can be loaded by a ScriptScope? To explain
further: If I use the following code to load a py script file<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
ScriptRuntime env = ScriptRuntime.Create();<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ScriptEngine
eng = env.GetEngineByFileExtension( &quot;py&quot; );<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ScriptSource
source = eng.CreateScriptSourceFromString( form.Source, SourceCodeKind.File );<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
source.Execute();<br>
<br>
Where form.Source is a string containing this :<br>
<br>
import sys<br>
<br>
import clr<br>
clr.AddReference(&quot;System.Windows.Forms&quot;)<br>
clr.AddReference(&quot;System&quot;)<br>
clr.AddReference(&quot;Microsoft.Xna.Framework&quot;)<br>
clr.AddReference(&quot;Microsoft.Xna.Framework.Graphics&quot;)<br>
clr.AddReference(&quot;Microsoft.Xna.Framework.Input&quot;)<br>
clr.AddReference(&quot;Bnoerj.AI.Steering.Demo.Plugins.Ctf&quot;)<br>
<br>
from Bnoerj.AI.Steering.Demo.Plugins.Ctf import CtfBase, Globals<br>
<br>
class CtfPythonSeeker(CtfBase):<br>
<br>
&nbsp;&nbsp;&nbsp; def __init__(self):<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Reset()<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; def Reset(self):<br>
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; Globals.Instance.Seeker = self<br>
<br>
How can I prevent some references from being referenced, like
&quot;Microsoft.Xna.Framework&quot; but allow
&quot;Bnoerj.AI.Steering.Demo.Plugins.Ctf&quot;?<br>
<br>
Thanks in advance<br>
<br>
Michael<o:p></o:p></p>

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