From c82dc2a1ec95ab55fa8082ee897493b93399ff74 Mon Sep 17 00:00:00 2001
From: Sipke Schoorstra <sipkeschoorstra@outlook.com>
Date: Mon, 18 Sep 2023 15:42:59 +0200
Subject: [PATCH] Add Input accessors for Liquid

---
 .../Elsa.Liquid/Handlers/ConfigureLiquidEngine.cs        | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/modules/Elsa.Liquid/Handlers/ConfigureLiquidEngine.cs b/src/modules/Elsa.Liquid/Handlers/ConfigureLiquidEngine.cs
index d47628c9d..74a7f5eb2 100644
--- a/src/modules/Elsa.Liquid/Handlers/ConfigureLiquidEngine.cs
+++ b/src/modules/Elsa.Liquid/Handlers/ConfigureLiquidEngine.cs
@@ -44,6 +44,7 @@ internal class ConfigureLiquidEngine : INotificationHandler<RenderingLiquidTempl
         memberAccessStrategy.Register<LiquidPropertyAccessor, FluidValue>((x, name) => x.GetValueAsync(name));
         memberAccessStrategy.Register<ExpandoObject, object>((x, name) => ((IDictionary<string, object>)x!)[name]);
         memberAccessStrategy.Register<ExpressionExecutionContext, LiquidPropertyAccessor>("Variables", x => new LiquidPropertyAccessor(name => GetVariable(x, name, options)));
+        memberAccessStrategy.Register<ExpressionExecutionContext, LiquidPropertyAccessor>("Input", x => new LiquidPropertyAccessor(name => GetInput(x, name, options)));
         memberAccessStrategy.Register<ExpressionExecutionContext, string?>("CorrelationId", x => x.GetWorkflowExecutionContext().CorrelationId);
 
         if (_fluidOptions.AllowConfigurationAccess)
@@ -68,6 +69,14 @@ internal class ConfigureLiquidEngine : INotificationHandler<RenderingLiquidTempl
         return Task.FromResult(value == null ? NilValue.Instance : FluidValue.Create(value, options));
     }
 
+    private Task<FluidValue> GetInput(ExpressionExecutionContext context, string key, TemplateOptions options)
+    {
+        var workflowExecutionContext = context.GetWorkflowExecutionContext();
+        var input = workflowExecutionContext.Input.TryGetValue(key, out var value) ? value : default;
+        
+        return Task.FromResult(input == null ? NilValue.Instance : FluidValue.Create(value, options));
+    }
+
     private static object? GetVariableInScope(ExpressionExecutionContext context, string variableName)
     {
         var q = from variable in EnumerateVariablesInScope(context)