/// <summary>
/// Evaluate javascript in the current context with system privileges.
/// </summary>
/// <param name="jsScript"></param>
/// <param name="jsval"></param>
/// <returns></returns>
public bool EvaluateTrustedScript(string jsScript, out string result)
{
var ptr = new JsVal();
IntPtr globalObject = SpiderMonkey.JS_GetGlobalForScopeChain(_cx);
bool ret;
IntPtr systemGlobalObject = SpiderMonkey.JS_GetGlobalForScopeChain(GlobalJSContextHolder.BackstageJSContext);
// Compartments have to be entered and left in LIFO order.
bool inSystemCompartment = false;
IntPtr oldCompartment = IntPtr.Zero;
try
{
// Allow access to any object on page.
oldCompartment = SpiderMonkey.JS_EnterCompartment(_cx, systemGlobalObject);
// At any time, a JSContext has a current (possibly-NULL) compartment.
inSystemCompartment = true;
ret = SpiderMonkey.JS_EvaluateScript(_cx, globalObject, jsScript, (uint)jsScript.Length, "script", 1, ref ptr);
IntPtr jsStringPtr = SpiderMonkey.JS_ValueToString(_cx, ptr);
result = Marshal.PtrToStringAnsi(SpiderMonkey.JS_EncodeString(_cx, jsStringPtr));
}
finally
{
if (inSystemCompartment)
{
SpiderMonkey.JS_LeaveCompartment(_cx, oldCompartment);
}
}
return(ret);
}
internal string ConvertValueToString(JsVal value)
{
if (value.IsString)
{
var v = Xpcom.XPConnect.Instance.JSValToVariant(_cx, ref value);
return(nsString.Get(v.GetAsAString));
}
// Fallback for non string JsVal's
// If the JsVal is not a string convert it to a JSString
// then convert the JSString to a utf8 string.
// NOTE: This fallback isn't ideal and may cause unicode replacement chars to appear.
IntPtr jsp = SpiderMonkey.JS_ValueToString(_cx, value);
var utf8StrPtr = SpiderMonkey.JS_EncodeStringToUTF8(_cx, jsp);
if (utf8StrPtr != IntPtr.Zero)
{
try
{
var length = SpiderMonkey.JS_GetStringEncodingLength(_cx, jsp);
byte[] result = new byte[length];
Marshal.Copy(utf8StrPtr, result, 0, length);
return(Encoding.UTF8.GetString(result, 0, length));
}
finally
{
SpiderMonkey.JS_Free(_cx, utf8StrPtr);
}
}
return(null);
}
public override string ToString()
{
using (AutoJSContext context = new AutoJSContext())
{
IntPtr jsString = SpiderMonkey.JS_ValueToString(context.ContextPointer, this);
return(Marshal.PtrToStringAnsi(SpiderMonkey.JS_EncodeString(context.ContextPointer, jsString)));
}
}
/// <summary>
/// Evaluate javascript in the current context.
/// </summary>
/// <param name="jsScript"></param>
/// <param name="jsval"></param>
/// <returns></returns>
public bool EvaluateScript(string jsScript, out string result)
{
var ptr = new JsVal();
IntPtr globalObject = SpiderMonkey.JS_GetGlobalForScopeChain(_cx);
bool ret = SpiderMonkey.JS_EvaluateScript(_cx, globalObject, jsScript, (uint)jsScript.Length, "script", 1, ref ptr);
IntPtr jsStringPtr = SpiderMonkey.JS_ValueToString(_cx, ptr);
result = Marshal.PtrToStringAnsi(SpiderMonkey.JS_EncodeString(_cx, jsStringPtr));
return(ret);
}
/// <summary>
/// Evaluate javascript in the current context.
/// </summary>
/// <param name="jsScript"></param>
/// <param name="jsval"></param>
/// <returns></returns>
public bool EvaluateScript(string jsScript, out string result)
{
var ptr = new JsVal();
IntPtr globalObject = SpiderMonkey.JS_GetGlobalForScopeChain(_cx);
bool ret = SpiderMonkey.JS_EvaluateScript(_cx, globalObject, jsScript, (uint)jsScript.Length, "script", 1, ref ptr);
// TODO: maybe getting JS_EvaluateScriptForPrincipals working would increase priviliges of the running script.
//bool ret = SpiderMonkey.JS_EvaluateScriptForPrincipals(_cx, globalObject, ..., jsScript, (uint)jsScript.Length,"script", 1, ref ptr);
IntPtr jsStringPtr = SpiderMonkey.JS_ValueToString(_cx, ptr);
result = Marshal.PtrToStringAnsi(SpiderMonkey.JS_EncodeString(_cx, jsStringPtr));
return(ret);
}
internal string ConvertValueToString(JsVal value)
{
IntPtr jsp = SpiderMonkey.JS_ValueToString(_cx, value);
if (jsp != IntPtr.Zero)
{
uint length;
var chars = SpiderMonkey.JS_GetStringCharsAndLength(_cx, jsp, out length);
if (chars != IntPtr.Zero)
{
return(Marshal.PtrToStringUni(chars, (int)length));
}
}
return(null);
}
/// <summary>
/// Evaluate javascript in the current context.
/// </summary>
/// <param name="jsScript"></param>
/// <param name="thisObject">a nsISupports com object that this is set too.</param>
/// <param name="result"></param>
/// <returns></returns>
public bool EvaluateScript(string jsScript, nsISupports thisObject, out string result)
{
try
{
Guid guid = typeof(nsISupports).GUID;
IntPtr globalObject = SpiderMonkey.JS_GetGlobalForScopeChain(_cx);
var ptr = new JsVal();
var wrapper = XPConnect.WrapNative(_cx, globalObject, thisObject, ref guid);
bool ret = SpiderMonkey.JS_EvaluateScript(_cx, wrapper.GetJSObjectAttribute(), jsScript, (uint)jsScript.Length, "script", 1, ref ptr);
IntPtr jsStringPtr = SpiderMonkey.JS_ValueToString(_cx, ptr);
result = Marshal.PtrToStringAnsi(SpiderMonkey.JS_EncodeString(_cx, jsStringPtr));
return(ret);
}
catch (Exception e)
{
Console.WriteLine("Exception {0}", e);
result = String.Empty;
return(false);
}
}
