Support environment URL parsing (#762)

* environment URL parsing

src/Sdk/DTPipelines/Pipelines/AgentJobRequestMessage.cs

@@ -41,7 +41,8 @@ namespace GitHub.DistributedTask.Pipelines
             IEnumerable<JobStep> steps,
             IList<String> fileTable,
             TemplateToken jobOutputs,
-            IList<TemplateToken> defaults)
+            IList<TemplateToken> defaults,
+            ActionsEnvironmentReference actionsEnvironment)
         {
             this.MessageType = JobRequestMessageTypes.PipelineAgentJobRequest;
             this.Plan = plan;
@@ -54,7 +55,7 @@ namespace GitHub.DistributedTask.Pipelines
             this.Resources = jobResources;
             this.Workspace = workspaceOptions;
             this.JobOutputs = jobOutputs;
-
+            this.ActionsEnvironment = actionsEnvironment;
             m_variables = new Dictionary<String, VariableValue>(variables, StringComparer.OrdinalIgnoreCase);
             m_maskHints = new List<MaskHint>(maskHints);
             m_steps = new List<JobStep>(steps);
@@ -228,6 +229,13 @@ namespace GitHub.DistributedTask.Pipelines
             }
         }
 
+        [DataMember(EmitDefaultValue = false)]
+        public ActionsEnvironmentReference ActionsEnvironment
+        {
+            get;
+            set;
+        }
+
         /// <summary>
         /// Gets the collection of variables associated with the current context.
         /// </summary>

src/Sdk/DTPipelines/Pipelines/ObjectTemplating/PipelineTemplateConstants.cs

@@ -17,6 +17,7 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
         public const String Credentials = "credentials";
         public const String Defaults = "defaults";
         public const String Env = "env";
+        public const String Environment = "environment";
         public const String Event = "event";
         public const String EventPattern = "github.event";
         public const String Exclude = "exclude";

src/Sdk/DTPipelines/Pipelines/ObjectTemplating/PipelineTemplateEvaluator.cs

@@ -279,6 +279,33 @@ namespace GitHub.DistributedTask.Pipelines.ObjectTemplating
             return result;
         }
 
+        public TemplateToken EvaluateEnvironmentUrl(
+            TemplateToken token,
+            DictionaryContextData contextData,
+            IList<IFunctionInfo> expressionFunctions)
+        {
+            var result = default(TemplateToken);
+            if (token != null && token.Type != TokenType.Null)
+            {
+                var context = CreateContext(contextData, expressionFunctions);
+                try
+                {
+                    token = TemplateEvaluator.Evaluate(context, TemplateConstants.StringRunnerContextNoSecrets, token, 0, null, omitHeader: true);
+                    context.Errors.Check();
+                    result = token.AssertString("environment.url");
+                }
+                catch (Exception ex) when (!(ex is TemplateValidationException))
+                {
+                    context.Errors.Add(ex);
+                }
+
+                context.Errors.Check();
+            }
+
+            return result;
+        }
+
+
         public Dictionary<String, String> EvaluateJobDefaultsRun(
             TemplateToken token,
             DictionaryContextData contextData,

src/Sdk/DTPipelines/workflow-v1.0.json

@@ -515,6 +515,20 @@
       "string": {}
     },
 
+    "string-runner-context-no-secrets": {
+      "context": [
+        "github",
+        "needs",
+        "strategy",
+        "matrix",
+        "steps",
+        "job",
+        "runner",
+        "env"
+      ],
+      "string": {}
+    },
+
     "string-steps-context": {
       "context": [
         "github",
@@ -531,4 +545,4 @@
       "string": {}
     }
   }
-}
+}