Add event-driven quick action dispatch

F4SD-ActionConnector/Execution/PayloadVariableResolver.cs

@@ -0,0 +1,94 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Reflection;
+using System.Text.RegularExpressions;
+using F4SD.ActionConnector.Payloads;
+
+namespace F4SD.ActionConnector.Execution
+{
+    /// <summary>
+    /// Resolves template variables such as {{Case.Id}} or {{Case.ClosedAt:yyyy-MM-ddTHH:mm:ssZ}}
+    /// against a payload object.
+    ///
+    /// Variable format:  {{ObjectName.PropertyName[:FormatSpecifier]}}
+    /// </summary>
+    internal static class PayloadVariableResolver
+    {
+        private static readonly Regex VariablePattern =
+            new Regex(@"\{\{(?<obj>[^.}]+)\.(?<prop>[^:}]+)(?::(?<fmt>[^}]+))?\}\}",
+                RegexOptions.Compiled);
+
+        /// <summary>
+        /// Returns a new dictionary with every value in <paramref name="rawParameters"/> having
+        /// its template variables replaced by the corresponding payload property values.
+        /// Pure single-variable templates (e.g. <c>{{Case.ClosedAt}}</c>) yield the raw typed
+        /// object; mixed or formatted templates yield a resolved string.
+        /// </summary>
+        internal static IDictionary<string, object> Resolve(
+            IDictionary<string, string> rawParameters,
+            PayloadBase payload)
+        {
+            var resolved = new Dictionary<string, object>(rawParameters.Count);
+
+            foreach (var pair in rawParameters)
+                resolved[pair.Key] = ResolveValue(pair.Value, payload);
+
+            return resolved;
+        }
+
+        private static object ResolveValue(string template, PayloadBase payload)
+        {
+            var match = VariablePattern.Match(template);
+
+            // Pure single variable with no format specifier → return raw object
+            if (match.Success && match.Value == template && !match.Groups["fmt"].Success)
+                return ResolveRawProperty(match, payload);
+
+            // Mixed template, literal, or explicit format specifier → return resolved string
+            return ResolveString(template, payload);
+        }
+
+        private static object ResolveRawProperty(Match match, PayloadBase payload)
+        {
+            string propertyName = match.Groups["prop"].Value;
+
+            PropertyInfo property = payload.GetType().GetProperty(
+                propertyName,
+                BindingFlags.Public | BindingFlags.Instance | BindingFlags.IgnoreCase);
+
+            if (property == null)
+                return match.Value;
+
+            return property.GetValue(payload);
+        }
+
+        private static string ResolveString(string template, PayloadBase payload)
+        {
+            return VariablePattern.Replace(template, match => ResolveMatch(match, payload));
+        }
+
+        private static string ResolveMatch(Match match, PayloadBase payload)
+        {
+            string propertyName = match.Groups["prop"].Value;
+            string formatSpecifier = match.Groups["fmt"].Success ? match.Groups["fmt"].Value : null;
+
+            PropertyInfo property = payload.GetType().GetProperty(
+                propertyName,
+                BindingFlags.Public | BindingFlags.Instance | BindingFlags.IgnoreCase);
+
+            if (property == null)
+                return match.Value;
+
+            object value = property.GetValue(payload);
+
+            if (value == null)
+                return string.Empty;
+
+            if (formatSpecifier != null && value is IFormattable formattable)
+                return formattable.ToString(formatSpecifier, CultureInfo.InvariantCulture);
+
+            return value.ToString();
+        }
+    }
+}