feat: translate pseudo params starting with #

Closes #252

Author: theburningmonk

lib/deploy/stepFunctions/compileStateMachines.js

@@ -62,6 +62,25 @@ function* getIntrinsicFunctions(obj) {
   }
 }
 
+// replace any pseudo parameters, e.g. #{AWS::Region} or #{AWS::AccountId}
+function replacePseudoParameters(obj) {
+  const json = JSON.stringify(obj);
+
+  const regex = /#{([^}]+)}/g;
+  if (json.search(regex) >= 0) {
+    const newJson = json.replace(regex, '${$1}');
+    return {
+      replaced: true,
+      definition: JSON.parse(newJson),
+    };
+  }
+
+  return {
+    replaced: false,
+    definition: obj,
+  };
+}
+
 module.exports = {
   compileStateMachines() {
     if (this.isStateMachines()) {
@@ -98,9 +117,10 @@ module.exports = {
               .replace(/\\n|\\r|\\n\\r/g, '');
           } else {
             const functionMappings = Array.from(getIntrinsicFunctions(stateMachineObj.definition));
-            const definitionString = JSON.stringify(stateMachineObj.definition, undefined, 2);
+            const { replaced, definition } = replacePseudoParameters(stateMachineObj.definition);
+            const definitionString = JSON.stringify(definition, undefined, 2);
 
-            if (_.isEmpty(functionMappings)) {
+            if (!replaced && _.isEmpty(functionMappings)) {
               DefinitionString = definitionString;
             } else {
               const f = translateLocalFunctionNames.bind(this);

lib/deploy/stepFunctions/compileStateMachines.test.js

@@ -336,7 +336,7 @@ describe('#compileStateMachines', () => {
       States: {
         HelloWorld: {
           Type: 'Task',
-          Resource: 'arn:aws:lambda:#{AWS::Region}:#{AWS::AccountId}:function:hello',
+          Resource: 'arn:aws:lambda:us-east-1:1234567890:function:hello',
           End: true,
         },
       },
@@ -1108,4 +1108,45 @@ describe('#compileStateMachines', () => {
     // Definition is invalid and validate=true, should throw
     expect(() => serverlessStepFunctions.compileStateMachines()).to.throw(Error);
   });
+
+  it('should replace pseudo parameters that starts with #', () => {
+    const definition = {
+      StartAt: 'A',
+      States: {
+        A: {
+          Type: 'Task',
+          Resource: 'arn:aws:lambda:#{AWS::Region}:#{AWS::AccountId}:function:hello',
+          End: true,
+        },
+      },
+    };
+
+    serverless.service.stepFunctions = {
+      stateMachines: {
+        myStateMachine1: {
+          name: 'stateMachineBeta1',
+          definition,
+        },
+      },
+    };
+
+    serverlessStepFunctions.compileStateMachines();
+    const actual = serverlessStepFunctions
+      .serverless
+      .service
+      .provider
+      .compiledCloudFormationTemplate
+      .Resources
+      .StateMachineBeta1
+      .Properties
+      .DefinitionString;
+
+    expect(actual).to.haveOwnProperty('Fn::Sub');
+    const [definitionString, params] = actual['Fn::Sub'];
+    expect(definitionString).to.contain('${AWS::Region}');
+    expect(definitionString).to.not.contain('#{AWS::Region}');
+    expect(definitionString).to.contain('${AWS::AccountId}');
+    expect(definitionString).to.not.contain('#{AWS::AccountId}');
+    expect(params).to.deep.equal({});
+  });
 });