Compare updated template evaluator (#4092)

src/Sdk/WorkflowParser/WorkflowFeatures.cs

@@ -0,0 +1,95 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.Serialization;
+
+namespace GitHub.Actions.WorkflowParser
+{
+    /// <summary>
+    /// Features flags (mostly short-lived)
+    /// </summary>
+    [DataContract]
+    public class WorkflowFeatures
+    {
+        /// <summary>
+        /// Gets or sets a value indicating whether users may specify permission "id-token".
+        /// Used during parsing only.
+        /// </summary>
+        [DataMember(EmitDefaultValue = false)]
+        public bool IdToken { get; set; } // Remove with DistributedTask.AllowGenerateIdToken
+
+        /// <summary>
+        /// Gets or sets a value indicating whether users may specify permission "short-matrix-ids".
+        /// Used during parsing and evaluation.
+        /// </summary>
+        [DataMember(EmitDefaultValue = false)]
+        public bool ShortMatrixIds { get; set; } // Remove with DistributedTask.GenerateShortMatrixIds
+
+        /// <summary>
+        /// Gets or sets a value indicating whether users may use the "snapshot" keyword. 
+        /// Used during parsing only.
+        /// More information: https://github.com/github/hosted-runners/issues/186 
+        /// </summary>
+        [DataMember(EmitDefaultValue = false)]
+        public bool Snapshot { get; set; }
+
+        /// <summary>
+        /// Gets or sets a value indicating whether users may use the "models" permission. 
+        /// Used during parsing only.
+        /// </summary>
+        [DataMember(EmitDefaultValue = false)]
+        public bool AllowModelsPermission { get; set; }
+
+        /// <summary>
+        /// Gets or sets a value indicating whether the expression function fromJson performs strict JSON parsing.
+        /// Used during evaluation only.
+        /// </summary>
+        [DataMember(EmitDefaultValue = false)]
+        public bool StrictJsonParsing { get; set; }
+
+        /// <summary>
+        /// Gets the default workflow features.
+        /// </summary>
+        public static WorkflowFeatures GetDefaults()
+        {
+            return new WorkflowFeatures
+            {
+                IdToken = true,             // Default to true since this is a long-lived feature flag
+                ShortMatrixIds = true,      // Default to true since this is a long-lived feature flag
+                Snapshot = false,           // Default to false since this feature is still in an experimental phase
+                StrictJsonParsing = false,  // Default to false since this is temporary for telemetry purposes only
+                AllowModelsPermission = false, // Default to false since we want this to be disabled for all non-production environments
+            };
+        }
+
+        /// <summary>
+        /// Gets the value of the feature flag
+        /// </summary>
+        public bool GetFeature(string name)
+        {
+            return (bool)s_properties[name].GetValue(this)!;
+        }
+
+        /// <summary>
+        /// Sets the value of the feature flag
+        /// </summary>
+        public void SetFeature(string name, bool value)
+        {
+            s_properties[name].SetValue(this, value);
+        }
+
+        /// <summary>
+        /// Reflection info for accessing the feature flags
+        /// </summary>
+        private static readonly Dictionary<string, PropertyInfo> s_properties =
+            typeof(WorkflowFeatures).GetProperties(BindingFlags.Public | BindingFlags.Instance)
+            .Where(x => x.PropertyType == typeof(bool)) // Boolean properties only
+            .ToDictionary(x => x.Name, StringComparer.Ordinal);
+
+        /// <summary>
+        /// Names of all feature flags
+        /// </summary>
+        public static readonly IReadOnlyList<string> Names = s_properties.Keys.Order().ToList().AsReadOnly();
+    }
+}