Support MultiSelect List in OperationContextParams

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/endpointsV2/RuleSetParameterFinder.java

@@ -277,39 +277,7 @@ public Map<String, String> getOperationContextParamValues(OperationShape operati
                 String separator = "?.";
                 String value = "input";
                 String path = definition.getPath();
-
-                // Split JMESPath expression string on separator and add JavaScript equivalent.
-                for (String part : path.split("[" + separator + "]")) {
-                    if (value.endsWith(")")) {
-                        // The value is an object, which needs to run on map.
-                        value += ".map((obj: any) => obj";
-                    }
-
-                    // Process keys https://jmespath.org/specification.html#keys
-                    if (part.startsWith("keys(")) {
-                        // Get provided object for which keys are to be extracted.
-                        String object = part.substring(5, part.length() - 1);
-                        value = "Object.keys(" + value + separator + object + " ?? {})";
-                        continue;
-                    }
-
-                    // Process list wildcard expression https://jmespath.org/specification.html#wildcard-expressions
-                    if (part.equals("*") || part.equals("[*]")) {
-                        value = "Object.values(" + value + " ?? {})";
-                        continue;
-                    }
-
-                    // Process hash wildcard expression https://jmespath.org/specification.html#wildcard-expressions
-                    if (part.endsWith("[*]")) {
-                        // Get key to run hash wildcard on.
-                        String key = part.substring(0, part.length() - 3);
-                        value = value + separator + key + separator + "map((obj: any) => obj";
-                        continue;
-                    }
-
-                    // Treat remaining part as identifier without spaces https://jmespath.org/specification.html#identifiers
-                    value += separator + part;
-                }
+                value = getJmesPathExpression(separator, value, path);
 
                 // Remove no-op map, if it exists.
                 final String noOpMap = "map((obj: any) => obj";
@@ -328,6 +296,74 @@ public Map<String, String> getOperationContextParamValues(OperationShape operati
         return map;
     }
 
+    private String getJmesPathExpression(String separator, String value, String path) {
+        // Split JMESPath expression string on separator and add JavaScript equivalent.
+        while (path.length() > 0) {
+            if (path.startsWith("[") && !path.startsWith("[*]")) {
+                // Process MultiSelect List https://jmespath.org/specification.html#multiselect-list
+                if (value.endsWith("obj")) {
+                   value = value.substring(0, value.length() - 3);
+                }
+
+                value += "[";
+                path = path.substring(1);
+
+                while (true) {
+                    int commaIndex = path.indexOf(",");
+                    int sepIndex = (commaIndex == -1) ? path.indexOf("]") : commaIndex;
+                    String part = path.substring(0, sepIndex);
+                    path = path.substring(sepIndex + 1).trim();
+                    value += getJmesPathExpression(separator, "obj", part) + ",";
+                    if (commaIndex == -1) {
+                        // Remove trailing comma and close bracket.
+                        value = value.substring(0, value.length() - 1) + "].filter((i) => i))";
+                        break;
+                    }
+                }
+                continue;
+            }
+
+            int dotIndex = path.indexOf(".");
+            String part = dotIndex == -1 ? path : path.substring(0, dotIndex);
+            path = dotIndex == -1 ? "" : path.substring(dotIndex + 1);
+            value = getJmesPathExpressionSection(separator, value, part);
+        }
+        return value;
+    }
+
+    private String getJmesPathExpressionSection(String separator, String value, String part) {
+        if (value.endsWith(")")) {
+            // The value is an object, which needs to run on map.
+            value += ".map((obj: any) => obj";
+        }
+
+        // Process keys https://jmespath.org/specification.html#keys
+        if (part.startsWith("keys(")) {
+            // Get provided object for which keys are to be extracted.
+            String object = part.substring(5, part.length() - 1);
+            value = "Object.keys(" + value + separator + object + " ?? {})";
+            return value;
+        }
+
+        // Process list wildcard expression https://jmespath.org/specification.html#wildcard-expressions
+        if (part.equals("*") || part.equals("[*]")) {
+            value = "Object.values(" + value + " ?? {})";
+            return value;
+        }
+
+        // Process hash wildcard expression https://jmespath.org/specification.html#wildcard-expressions
+        if (part.endsWith("[*]")) {
+            // Get key to run hash wildcard on.
+            String key = part.substring(0, part.length() - 3);
+            value = value + separator + key + separator + "map((obj: any) => obj";
+            return value;
+        }
+
+        // Treat remaining part as identifier without spaces https://jmespath.org/specification.html#identifiers
+        value += separator + part;
+        return value;
+    }
+
     private static class RuleSetParameterFinderVisitor extends NodeVisitor.Default<Void> {
         private final Map<String, String> map;
 

smithy-typescript-codegen/src/test/java/software/amazon/smithy/typescript/codegen/CommandGeneratorTest.java

@@ -44,6 +44,7 @@ public void writesOperationContextParamValues() {
                 "opContextParamWildcardExpressionList: { type: \"operationContextParams\", get: (input?: any) => input?.fooList }",
                 "opContextParamWildcardExpressionListObj: { type: \"operationContextParams\", get: (input?: any) => input?.fooListObj?.map((obj: any) => obj?.key) }",
                 "opContextParamWildcardExpressionHash: { type: \"operationContextParams\", get: (input?: any) => Object.values(input?.fooObjObj ?? {}).map((obj: any) => obj?.bar) }",
+                "opContextParamMultiSelectList: { type: \"operationContextParams\", get: (input?: any) => input?.fooListObjObj?.map((obj: any) => [obj?.fooList[0],obj?.fooObject?.bar,obj?.fooString].filter((i) => i)) }",
                 "opContextParamKeys: { type: \"operationContextParams\", get: (input?: any) => Object.keys(input?.fooKeys ?? {}) }",
             }
         );

smithy-typescript-codegen/src/test/resources/software/amazon/smithy/typescript/codegen/endpointsV2/endpoints-operation-context-params.smithy

@@ -20,6 +20,9 @@ namespace smithy.example
         opContextParamWildcardExpressionHash: {
             type: "stringArray",
         },
+        opContextParamMultiSelectList: {
+            type: "stringArray",
+        },
         opContextParamKeys: {
             type: "stringArray",
         },
@@ -37,6 +40,7 @@ service Example {
     "opContextParamWildcardExpressionList": { path: "fooList[*]" }
     "opContextParamWildcardExpressionListObj": { path: "fooListObj[*].key" }
     "opContextParamWildcardExpressionHash": { path: "fooObjObj.*.bar" }
+    "opContextParamMultiSelectList": { path: "fooListObjObj[*].[fooList[0], fooObject.bar, fooString]" }
     "opContextParamKeys": { path: "keys(fooKeys)" }
 )
 operation GetFoo {
@@ -48,7 +52,8 @@ operation GetFoo {
 structure GetFooInput {
     fooKeys: FooObject,
     fooList: FooList,
-    fooListObj: FooListObj,
+    fooListObj: FooListObject,
+    fooListObjObj: FooListObjectObject,
     fooObj: FooObject,
     fooObjObj: FooObjectObject,
     fooString: String,
@@ -58,6 +63,16 @@ structure FooObject {
     bar: String
 }
 
+list FooListObjectObject {
+    member: FooMultiSelectObjectObject
+}
+
+structure FooMultiSelectObjectObject {
+    fooList: FooList
+    fooObject: FooObject
+    fooString: String
+}
+
 structure FooObjectObject {
     baz: FooObject
 }
@@ -66,11 +81,11 @@ list FooList {
     member: String
 }
 
-list FooListObj {
-    member: FooListObjMember
+list FooListObject {
+    member: FooListObjectMember
 }
 
-structure FooListObjMember {
+structure FooListObjectMember {
     key: String
 }