/// <summary>
/// Collect values for UsingExpressions, in the form of a dictionary and an array.
/// - The dictionary form is used when the remote server is PSv5 and later version for handling UsingExpression in Invoke-Command/Start-Job
/// - The array form is used when the remote server is PSv3 and PSv4 for handling UsingExpression in Invoke-Command.
/// </summary>
/// <remarks>
/// We still keep the array-form using values because we want to avoid any breaking changes when running Invoke-Command
/// targeting PSv3 or PSv4 remote end -- if UsingExpressions are all in the same scope, then we still pass an array of using
/// values to the remote end; otherwise, we will handle UsingExpression as if the remote end is PSv2.
/// </remarks>
/// <returns>
/// A tuple of the dictionary-form and the array-form using values.
/// If the array-form using value is null, then there are UsingExpressions used in different scopes.
/// </returns>
private static Tuple <Dictionary <string, object>, object[]> GetUsingValues(Ast body, bool isTrustedInput, ExecutionContext context, Dictionary <string, object> variables, bool filterNonUsingVariables)
{
Diagnostics.Assert(context != null || variables != null, "can't retrieve variables with no context and no variables");
var usingAsts = UsingExpressionAstSearcher.FindAllUsingExpressionExceptForWorkflow(body).ToList();
var usingValueArray = new object[usingAsts.Count];
var usingValueMap = new Dictionary <string, object>(usingAsts.Count);
HashSet <string> usingVarNames = (variables != null && filterNonUsingVariables) ? new HashSet <string>() : null;
// Used to check if the PSv3/PSv4 way of handling UsingExpression can continue to be used.
bool hasUsingExprInDifferentScope = false;
ScriptBlockAst sbClosestToPreUsingExpr = null;
UsingExpressionAst usingAst = null;
Version oldStrictVersion = null;
try
{
if (context != null)
{
oldStrictVersion = context.EngineSessionState.CurrentScope.StrictModeVersion;
context.EngineSessionState.CurrentScope.StrictModeVersion = PSVersionInfo.PSVersion;
}
for (int i = 0; i < usingAsts.Count; ++i)
{
usingAst = (UsingExpressionAst)usingAsts[i];
object value = null;
// This happens only when GetUsingValues gets called outside the ScriptBlockToPowerShellConverter class
if (!hasUsingExprInDifferentScope && HasUsingExpressionsInDifferentScopes(usingAst, body, ref sbClosestToPreUsingExpr))
{
// If there are UsingExpressions in different scopes, the array-form using values will not be useful
// even if the remote end is PSv3 or PSv4, because the way we handle using expression in PSv3 and PSv4
// doesn't support UsingExpression in different scopes. In this case, we will set the array-form using
// value to be null before return.
//
// Note that this check only affect array-form using value. In PSv5, we change the way to handle UsingExpression
// on both client and server sides. The dictionary-form using values is used and UsingExpression in different
// scope is supported.
hasUsingExprInDifferentScope = true;
}
if (variables != null)
{
var variableAst = usingAst.SubExpression as VariableExpressionAst;
if (variableAst == null)
{
throw InterpreterError.NewInterpreterException(null, typeof(RuntimeException),
usingAst.Extent, "CantGetUsingExpressionValueWithSpecifiedVariableDictionary", AutomationExceptions.CantGetUsingExpressionValueWithSpecifiedVariableDictionary, usingAst.Extent.Text);
}
string varName = variableAst.VariablePath.UserPath;
if (varName != null && variables.TryGetValue(varName, out value) && usingVarNames != null)
{
usingVarNames.Add(varName);
}
}
else
{
value = Compiler.GetExpressionValue(usingAst.SubExpression, isTrustedInput, context);
}
// Collect UsingExpression value as an array
usingValueArray[i] = value;
// Collect UsingExpression value as a dictionary
string usingAstKey = PsUtils.GetUsingExpressionKey(usingAst);
usingValueMap.TryAdd(usingAstKey, value);
}
}
catch (RuntimeException rte)
{
if (rte.ErrorRecord.FullyQualifiedErrorId.Equals("VariableIsUndefined", StringComparison.Ordinal))
{
throw InterpreterError.NewInterpreterException(null, typeof(RuntimeException),
usingAst.Extent, "UsingVariableIsUndefined", AutomationExceptions.UsingVariableIsUndefined, rte.ErrorRecord.TargetObject);
}
else if (rte.ErrorRecord.FullyQualifiedErrorId.Equals("CantGetUsingExpressionValueWithSpecifiedVariableDictionary", StringComparison.Ordinal))
{
throw;
}
}
finally
{
if (context != null)
{
context.EngineSessionState.CurrentScope.StrictModeVersion = oldStrictVersion;
}
}
if (usingVarNames != null)
{
string[] keys = variables.Keys.ToArray();
foreach (string key in keys)
{
if (!usingVarNames.Contains(key))
{
variables.Remove(key);
}
}
}
if (hasUsingExprInDifferentScope)
{
usingValueArray = null;
}
return(Tuple.Create(usingValueMap, usingValueArray));
}
private static object[] GetUsingValues(Ast body, ExecutionContext context, Dictionary <string, object> variables, bool filterNonUsingVariables)
{
List <Ast> list = UsingExpressionAstSearcher.FindAllUsingExpressionExceptForWorkflow(body).ToList <Ast>();
object[] objArray = new object[list.Count];
HashSet <string> set = ((variables != null) && filterNonUsingVariables) ? new HashSet <string>() : null;
UsingExpressionAst usingExpr = null;
Version strictModeVersion = null;
try
{
if (context != null)
{
strictModeVersion = context.EngineSessionState.CurrentScope.StrictModeVersion;
context.EngineSessionState.CurrentScope.StrictModeVersion = PSVersionInfo.PSVersion;
}
for (int i = 0; i < objArray.Length; i++)
{
usingExpr = (UsingExpressionAst)list[i];
if (IsUsingExpressionInFunction(usingExpr, body))
{
throw InterpreterError.NewInterpreterException(null, typeof(RuntimeException), usingExpr.Extent, "UsingVariableNotSupportedInFunctionOrFilter", AutomationExceptions.UsingVariableNotSupportedInFunctionOrFilter, new object[] { usingExpr });
}
object obj2 = null;
if (variables != null)
{
VariableExpressionAst subExpression = usingExpr.SubExpression as VariableExpressionAst;
if (subExpression == null)
{
throw InterpreterError.NewInterpreterException(null, typeof(RuntimeException), usingExpr.Extent, "CantGetUsingExpressionValueWithSpecifiedVariableDictionary", AutomationExceptions.CantGetUsingExpressionValueWithSpecifiedVariableDictionary, new object[] { usingExpr.Extent.Text });
}
string userPath = subExpression.VariablePath.UserPath;
if (((userPath != null) && variables.TryGetValue(userPath, out obj2)) && (set != null))
{
set.Add(userPath);
}
}
else
{
obj2 = Compiler.GetExpressionValue(usingExpr.SubExpression, context, (IList)null);
}
objArray[i] = obj2;
usingExpr.RuntimeUsingIndex = i;
}
}
catch (RuntimeException exception)
{
if (exception.ErrorRecord.FullyQualifiedErrorId.Equals("VariableIsUndefined", StringComparison.Ordinal))
{
throw InterpreterError.NewInterpreterException(null, typeof(RuntimeException), usingExpr.Extent, "UsingVariableIsUndefined", AutomationExceptions.UsingVariableIsUndefined, new object[] { exception.ErrorRecord.TargetObject });
}
if (exception.ErrorRecord.FullyQualifiedErrorId.Equals("UsingVariableNotSupportedInFunctionOrFilter", StringComparison.Ordinal) || exception.ErrorRecord.FullyQualifiedErrorId.Equals("CantGetUsingExpressionValueWithSpecifiedVariableDictionary", StringComparison.Ordinal))
{
throw;
}
}
finally
{
if (context != null)
{
context.EngineSessionState.CurrentScope.StrictModeVersion = strictModeVersion;
}
}
if (set != null)
{
foreach (string str2 in variables.Keys.ToArray <string>())
{
if (!set.Contains(str2))
{
variables.Remove(str2);
}
}
}
return(objArray);
}